Develop Reference

How can I change the TextView's content by swiping horizontally?

I have an audiobook app that I'm currently working on. If the book has audio, the controller will be shown. If not, it'll only show the text. I want to switch the chapters just by swiping at the text. I'm currently using a RelativeLayout and the text is wrapped in a ScrollView. I read that I should use ViewPager. But I was wondering if I could just keep using the RelativeLayout and ScrollView.
player.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/mainbg">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#color/m_tab_color"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
app:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar" />
<LinearLayout
android:id="#+id/player_footer_bg"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="#FFFFFF"
android:gravity="center"
android:orientation="vertical">
<RelativeLayout
android:id="#+id/linearButton"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp">
<ImageButton
android:id="#+id/btnRepeat"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_centerVertical="true"
android:background="#null"
android:src="#drawable/btn_repeat"
tools:ignore="ContentDescription" />
<ImageButton
android:id="#+id/btnShuffle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_centerVertical="true"
android:background="#null"
android:src="#drawable/btn_shuffle"
tools:ignore="ContentDescription" />
<ImageButton
android:id="#+id/btnNext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerVertical="true"
android:layout_toEndOf="#+id/btnPlay"
android:background="#null"
android:src="#drawable/btn_next"
tools:ignore="ContentDescription" />
<ImageButton
android:id="#+id/btnPlay"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_margin="5dp"
android:background="#drawable/btn_play"
android:src="#drawable/pause"
tools:ignore="ContentDescription" />
<ImageButton
android:id="#+id/btnPrevious"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_toStartOf="#+id/btnPlay"
android:background="#null"
android:src="#drawable/btn_prev"
tools:ignore="ContentDescription" />
</RelativeLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<FrameLayout
android:id="#+id/ad_view_container"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<RelativeLayout
android:id="#+id/ads_startapp"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:visibility="gone">
</RelativeLayout>
</LinearLayout>
</LinearLayout>
<RelativeLayout
android:id="#+id/sec_ssekbar"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_above="#id/player_footer_bg"
android:layout_centerVertical="true"
android:background="#00ffffff"
android:paddingLeft="7dp"
android:paddingRight="7dp">
<SeekBar
android:id="#+id/songProgressBar"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:paddingLeft="15dp"
android:paddingRight="15dp"
android:progressTint="#E94C3D"
android:thumb="#drawable/pointer"
android:thumbTint="#E94C3D"
android:thumbOffset="8dp"/>
<TextView
android:id="#+id/songCurrentDurationLabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/songProgressBar"
android:gravity="start"
android:text="#string/current_duration"
android:textColor="#color/black"
android:textStyle="bold" />
<TextView
android:id="#+id/songTotalDurationLabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_below="#+id/songProgressBar"
android:gravity="end"
android:text="#string/total_duration"
android:textColor="#color/black"
android:textStyle="bold" />
</RelativeLayout>
<ScrollView
android:id="#+id/scrollView1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_above="#+id/sec_ssekbar"
android:layout_below="#+id/toolbar"
android:layout_centerInParent="true"
android:layout_marginStart="3dp"
android:layout_marginTop="3dp"
android:layout_marginEnd="3dp"
android:layout_marginBottom="3dp"
android:background="#B3FFFFFF">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="#+id/text_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="5dp"
android:layout_marginTop="3dp"
android:layout_marginEnd="5dp"
android:layout_marginBottom="3dp"
android:gravity="center"
android:text="#string/app_name"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="#color/black"
android:textStyle="bold" />
<TextView
android:id="#+id/text_description"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="5dp"
android:layout_marginTop="5dp"
android:layout_marginEnd="5dp"
android:layout_marginBottom="5dp"
android:text="#string/app_name"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="#color/black" />
</LinearLayout>
</ScrollView>
</RelativeLayout>
MusicPlayActivity.java
public class MusicPlayActivity extends AppCompatActivity implements OnCompletionListener, SeekBar.OnSeekBarChangeListener {
Toolbar toolbar;
private ImageButton btnPlay;
private ImageButton btnRepeat;
private ImageButton btnShuffle;
private MediaPlayer mp;
ImageView img_song;
private int currentSongIndex = 0;
private boolean isShuffle = false;
private boolean isRepeat = false;
String[] allArrayImage, allArrayMusicCatName, allArrayMusicShare;
String[] allArrayMusicId, allArrayMusicCatId, allArrayMusicurl, allArrayMusicName, allArrayMusicDuration, allArrayMusicDesc;
int position = currentSongIndex;
int music_id;
private SeekBar songProgressBar;
private TextView songCurrentDurationLabel;
private TextView songTotalDurationLabel;
private Utilities utils;
private Handler mHandler = new Handler();
private Menu menu;
DatabaseHandler db;
String mp3id, mp3catid, mp3name, mp3url, mp3duration, mp3desc, mp3shareurl, mp3image, mp3catname;
private ActionClickItem actionClickItem;
private InterstitialAd mInterstitialAd;
private int btNextClicked = 1;
private AdsObj adsObj;
private StartAppAd startAppAd;
private boolean runClickExecuted;
private AdView adView;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.player);
MobileAds.initialize(this, new OnInitializationCompleteListener() {
#Override
public void onInitializationComplete(InitializationStatus initializationStatus) {}
});
btnPlay = findViewById(R.id.btnPlay);
ImageButton btnNext = findViewById(R.id.btnNext);
ImageButton btnPrevious = findViewById(R.id.btnPrevious);
btnRepeat = findViewById(R.id.btnRepeat);
btnShuffle = findViewById(R.id.btnShuffle);
TextView songTitleLabel = findViewById(R.id.text_title);
TextView songDesc = findViewById(R.id.text_description);
img_song = findViewById(R.id.image);
songProgressBar = findViewById(R.id.songProgressBar);
songCurrentDurationLabel = findViewById(R.id.songCurrentDurationLabel);
songTotalDurationLabel = findViewById(R.id.songTotalDurationLabel);
//imageView = (ImageView)findViewById(R.id.full_image);
// imageLoader=new ImageLoader(this);
db = new DatabaseHandler(this);
toolbar = this.findViewById(R.id.toolbar);
toolbar.setTitle(Constant.MUSIC_NAME);
this.setSupportActionBar(toolbar);
Objects.requireNonNull(getSupportActionBar()).setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
utils = new Utilities();
mp = new MediaPlayer();
Intent i = getIntent();
music_id = i.getIntExtra("POSITION", 0);
allArrayImage = i.getStringArrayExtra("MP3_IMAGE");
allArrayMusicCatName = i.getStringArrayExtra("MP3_CATNAME");
allArrayMusicShare = i.getStringArrayExtra("MP3_SHARE");
allArrayMusicId = i.getStringArrayExtra("MP3_CID");
allArrayMusicCatId = i.getStringArrayExtra("MP3_CATID");
allArrayMusicurl = i.getStringArrayExtra("MP3_URL");
allArrayMusicName = i.getStringArrayExtra("MP3_NAME");
allArrayMusicDuration = i.getStringArrayExtra("MP3_DURATION");
allArrayMusicDesc = i.getStringArrayExtra("MP3_DISCRIPTION");
position = getPositionFromArray(String.valueOf(music_id));
Log.e("POSITIO", "" + position);
playSong(position);
songProgressBar.setOnSeekBarChangeListener(this);
mp.setOnCompletionListener(this);
btnPlay.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
// check for already playing
if (mp.isPlaying()) {
if (mp != null) {
mp.pause();
// Changing button image to play button
btnPlay.setImageResource(R.drawable.btn_play);
}
} else {
// Resume song
if (mp != null) {
mp.start();
// Changing button image to pause button
btnPlay.setImageResource(R.drawable.btn_paush);
}
}
}
});
btnNext.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
btNextClicked++;
if ((btNextClicked % 3 == 0)) {
actionItemClicked(new ActionClickItem() {
#Override
public void runClick() {
// check if next song is there or not
if (position < (allArrayMusicurl.length - 1)) {
playSong(position + 1);
position = position + 1;
} else {
// play first song
playSong(0);
position = 0;
}
}
});
} else {
// check if next song is there or not
if (position < (allArrayMusicurl.length - 1)) {
position = position + 1;
playSong(position + 1);
} else {
// play first song
playSong(0);
position = 0;
}
}
}
});
btnPrevious.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
if (position > 0) {
playSong(position - 1);
position = position - 1;
} else {
// play last song
playSong(allArrayMusicurl.length - 1);
position = allArrayMusicurl.length - 1;
}
}
});
btnRepeat.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
if (isRepeat) {
isRepeat = false;
Toast.makeText(getApplicationContext(), "Repeat is OFF", Toast.LENGTH_SHORT).show();
btnRepeat.setImageResource(R.drawable.btn_repeat);
} else {
// make repeat to true
isRepeat = true;
Toast.makeText(getApplicationContext(), "Repeat is ON", Toast.LENGTH_SHORT).show();
// make shuffle to false
isShuffle = false;
btnRepeat.setImageResource(R.drawable.btn_repeat_focused);
btnShuffle.setImageResource(R.drawable.btn_shuffle);
}
}
});
btnShuffle.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
if (isShuffle) {
isShuffle = false;
Toast.makeText(getApplicationContext(), "Shuffle is OFF", Toast.LENGTH_SHORT).show();
btnShuffle.setImageResource(R.drawable.btn_shuffle);
} else {
// make repeat to true
isShuffle = true;
Toast.makeText(getApplicationContext(), "Shuffle is ON", Toast.LENGTH_SHORT).show();
// make shuffle to false
isRepeat = false;
btnShuffle.setImageResource(R.drawable.btn_shuffle_focused);
btnRepeat.setImageResource(R.drawable.btn_repeat);
}
}
});
//int songIndex = i.getIntExtra("songIndex", 0);
// Displaying Song title
String songTitle = allArrayMusicName[position];
songTitleLabel.setText(songTitle);
toolbar.setTitle(songTitle);
String musicUrl = allArrayMusicurl[position];
if(musicUrl.equals(".")){
songProgressBar.setVisibility(View.GONE);
songCurrentDurationLabel.setVisibility(View.GONE);
songTotalDurationLabel.setVisibility(View.GONE);
RelativeLayout linearButton = findViewById(R.id.linearButton);
linearButton.setVisibility(View.GONE);
}
#SuppressLint("CutPasteId") FrameLayout frameAds1 = findViewById(R.id.ad_view_container);
AdsAssistants adsAssistants = new AdsAssistants(this);
adsObj = adsAssistants.getSessionAdsObj();
if (adsObj != null) {
if (adsObj.getCurrentActivatedAds().equals(AdsConfig.ADS_ADMOB)) {
frameAds1.setVisibility(View.VISIBLE);
adsAssistants.createAdmobBanner(frameAds1, adsObj.getADS_ADMOB_BANNER());
} else {
startAppAd = new StartAppAd(this);
#SuppressLint("CutPasteId") FrameLayout frameAds = findViewById(R.id.ad_view_container);
frameAds.setVisibility(View.VISIBLE);
adsAssistants.createStartAppBanner(frameAds);
}
}
}
public void actionItemClicked(ActionClickItem actionClickItemParam) {
actionClickItem = actionClickItemParam;
if (adsObj == null) {
actionClickItem.runClick();
} else {
if (adsObj.getCurrentActivatedAds().equals(AdsConfig.ADS_ADMOB)) {
if (mInterstitialAd != null && mInterstitialAd.isLoaded()) {
mInterstitialAd.show();
} else {
actionClickItem.runClick();
generateInterstitialAd();
}
} else {
startAppAd.loadAd(new AdEventListener() {
#Override
public void onReceiveAd(Ad ad) {
}
#Override
public void onFailedToReceiveAd(Ad ad) {
// actionClickItem.runClick();
}
});
StartAppAd.disableAutoInterstitial();
startAppAd.showAd(new AdDisplayListener() {
#Override
public void adHidden(Ad ad) {
if(!runClickExecuted){
runClickExecuted = true;
actionClickItem.runClick();
}
Log.d("YWV", "Action clicked");
}
#Override
public void adDisplayed(Ad ad) {
}
#Override
public void adClicked(Ad ad) {
}
#Override
public void adNotDisplayed(Ad ad) {
}
});
}
}
}
private void generateInterstitialAd() {
mInterstitialAd = new InterstitialAd(this);
mInterstitialAd.setAdUnitId(adsObj.getADS_ADMOB_INTERSTITIALS());
mInterstitialAd.setAdListener(new AdListener() {
#Override
public void onAdLoaded() {
// mNextLevelButton.setEnabled(true);
}
#Override
public void onAdFailedToLoad(int errorCode) {
// mNextLevelButton.setEnabled(true);
}
#Override
public void onAdClosed() {
// Proceed to the next level.
//finish();
//showDialogApp();
actionClickItem.runClick();
generateInterstitialAd();
}
});
AdRequest adRequestIn = new AdRequest.Builder().build();
mInterstitialAd.loadAd(adRequestIn);
}
#Override
protected void onActivityResult(int requestCode,
int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == 100) {
position = Objects.requireNonNull(data.getExtras()).getInt("songIndex");
// play selected song
playSong(position);
}else if(resultCode == 11){
runClickExecuted = false;
}
}
public void playSong(int songIndex) {
// Play song
try {
// if(needResetFirst){
mp.reset();
// }
mp.setDataSource(allArrayMusicurl[songIndex]);
mp.prepare();
mp.start();
// // Displaying Song title
TextView songTitleLabel = findViewById(R.id.text_title);
String songTitle = allArrayMusicName[songIndex];
songTitleLabel.setText(songTitle);
toolbar.setTitle(songTitle);
TextView songDesc = findViewById(R.id.text_description);
String songDescd = allArrayMusicDesc[songIndex];
songDesc.setText(songDescd);
// Toast.makeText(getApplicationContext(), img_name,Toast.LENGTH_SHORT).show();
// imageLoader.DisplayImage(Constant.SERVER_IMAGE_UPFOLDER1+img_name, imageView);
// Log.e("IMAGEPATH", ""+Constant.SERVER_IMAGE_UPFOLDER1+img_name);
// Toast.makeText(getApplicationContext(), Constant.SERVER_IMAGE_UPFOLDER1+img_name,Toast.LENGTH_SHORT).show();
// Changing Button Image to pause image
btnPlay.setImageResource(R.drawable.btn_paush);
songProgressBar.setProgress(0);
songProgressBar.setMax(100);
// Updating progress bar
updateProgressBar();
// set Progress bar values
} catch (IllegalArgumentException | IllegalStateException | IOException e) {
e.printStackTrace();
}
}
#Override
public void onCompletion(MediaPlayer arg0) {
// check for repeat is ON or OFF
if (isRepeat) {
// repeat is on play same song again
playSong(position);
} else if (isShuffle) {
// shuffle is on - play a random song
Random rand = new Random();
position = rand.nextInt((allArrayMusicurl.length - 1) + 1);
playSong(position);
} else {
// no repeat or shuffle ON - play next song
if (position < (allArrayMusicurl.length - 1)) {
playSong(position + 1);
position = position + 1;
} else {
// play first song
playSong(0);
position = 0;
}
}
}
#Override
public void onBackPressed() {
// TODO Auto-generated method stub
super.onBackPressed();
if (mp != null) {
mp.reset();
mp.release();
mp = null;
mHandler.removeCallbacks(mUpdateTimeTask);
}
setResult(RESULT_OK);
finish();
}
public void updateProgressBar() {
mHandler.postDelayed(mUpdateTimeTask, 100);
}
private Runnable mUpdateTimeTask = new Runnable() {
public void run() {
long totalDuration = mp.getDuration();
long currentDuration = mp.getCurrentPosition();
// Displaying Total Duration time
songTotalDurationLabel.setText(utils.milliSecondsToTimer(totalDuration));
// Displaying time completed playing
songCurrentDurationLabel.setText(utils.milliSecondsToTimer(currentDuration));
// Updating progress bar
int progress = utils.getProgressPercentage(currentDuration, totalDuration);
//Log.d("Progress", ""+progress);
songProgressBar.setProgress(progress);
// Running this thread after 100 milliseconds
mHandler.postDelayed(this, 100);
}
};
#Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromTouch) {
}
#Override
public void onStartTrackingTouch(SeekBar seekBar) {
// remove message Handler from updating progress bar
mHandler.removeCallbacks(mUpdateTimeTask);
}
#Override
public void onStopTrackingTouch(SeekBar seekBar) {
mHandler.removeCallbacks(mUpdateTimeTask);
int totalDuration = mp.getDuration();
int currentPosition = utils.progressToTimer(seekBar.getProgress(), totalDuration);
// forward or backward to certain seconds
mp.seekTo(currentPosition);
// update timer progress again
updateProgressBar();
}
public void AddtoFav(int position) {
mp3id = allArrayMusicId[position];
// mp3catid=allArrayMusicCatId[position];
mp3catname = allArrayMusicCatName[position];
mp3url = allArrayMusicurl[position];
mp3image = allArrayImage[position];
mp3name = allArrayMusicName[position];
mp3duration = allArrayMusicDuration[position];
mp3desc = allArrayMusicDesc[position];
// mp3shareurl=allArrayMusicShare[position];
db.AddtoFavorite(new Pojo(mp3id, mp3catid, mp3catname, mp3url, mp3image, mp3name, mp3duration, mp3desc, mp3shareurl));
Toast.makeText(getApplicationContext(), "Added to Favorite", Toast.LENGTH_SHORT).show();
// fabfav.setImageDrawable(getResources().getDrawable(R.drawable.fav_hover));
}
//remove from favorite
public void RemoveFav(int position) {
mp3id = allArrayMusicId[position];
db.RemoveFav(new Pojo(mp3id));
Toast.makeText(getApplicationContext(), "Removed from Favorite", Toast.LENGTH_SHORT).show();
// fabfav.setImageDrawable(getResources().getDrawable(R.drawable.fav_hover));
}
public void FirstFav() {
mp3id = allArrayMusicId[position];
List<Pojo> pojolist = db.getFavRow(mp3id);
if (pojolist.size() == 0) {
menu.getItem(0).setIcon(getResources().getDrawable(R.drawable.fav));
} else {
if (pojolist.get(0).getMp3Id().equals(mp3id)) {
menu.getItem(0).setIcon(getResources().getDrawable(R.drawable.fav_hover));
}
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu_mp3, menu);
this.menu = menu;
//for when 1st item of view pager is favorite mode
FirstFav();
return super.onCreateOptionsMenu(menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem menuItem) {
switch (menuItem.getItemId()) {
case android.R.id.home:
onBackPressed();
return true;
case R.id.menu_fav:
mp3id = allArrayMusicId[position];
List<Pojo> pojolist = db.getFavRow(mp3id);
if (pojolist.size() == 0) {
AddtoFav(position);//if size is zero i.e means that record not in database show add to favorite
menu.getItem(0).setIcon(getResources().getDrawable(R.drawable.fav_hover));
} else {
if (pojolist.get(0).getMp3Id().equals(mp3id)) {
RemoveFav(position);
}
menu.getItem(0).setIcon(getResources().getDrawable(R.drawable.fav));
}
return true;
case R.id.menu_share:
Intent sharingIntent = new Intent(Intent.ACTION_SEND);
sharingIntent.putExtra(Intent.EXTRA_TEXT, "Listen to this verse from " + Constant.APP_NAME + "\n" + "http://play.google.com/store/apps/details?id=" + getPackageName());
sharingIntent.setType("text/plain");
startActivity(Intent.createChooser(sharingIntent, "Share Link"));
return true;
default:
return super.onOptionsItemSelected(menuItem);
}
}
public int getPositionFromArray(String id) {
return Arrays.asList(allArrayMusicId).indexOf(id);
}
#Override
public void onResume() {
super.onResume();
if (adView != null) {
adView.resume();
}
}
/** Called when leaving the activity */
#Override
public void onPause() {
if (adView != null) {
adView.pause();
}
super.onPause();
}
/** Called before the activity is destroyed */
#Override
public void onDestroy() {
super.onDestroy();
if (mp != null) {
mp.reset();
mp.release();
mHandler.removeCallbacks(mUpdateTimeTask);
mp = null;
}
finish();
if (adView != null) {
adView.destroy();
}
}
}
Thank you in advance !

You can detect gestures on any View by attaching an onTouchListener to it.
In your case however, you are trying to detect swiping gestures, therefore the best solution is to create a gesture detector class by extending an onTouchListener like in this tutorial (step 4):
https://www.tutorialspoint.com/how-to-handle-right-to-left-and-left-to-right-swipe-gestures-on-android
After doing this, you can easily attach the swipe-detector class to any of your views as:
textView.setOnTouchListener(new OnSwipeTouchListener(MainActivity.this) {
#Override
public void onSwipeLeft() {
super.onSwipeLeft();
// do something
}
#Override
public void onSwipeRight() {
super.onSwipeRight();
// do something
}
});

Have you tried to add and OnSwipeTouchListener like here https://stackoverflow.com/a/12938787/4330467?
Relativelayout should not be the issue

Not Showing camera on button Click in emulator

I'am trying to create an application whose purpose is to take picture on a button click.i am using an emulator to run the app. but the problem now is, when I click on the button nothing happens.
if anyone knows the solution please help.
MAINACTIVITY.JAVA
public class MainActivity extends Activity implements SurfaceHolder.Callback{
Camera camera;
SurfaceView surfaceView;
SurfaceHolder surfaceHolder;
Button b1;
Camera.PictureCallback rawCallback;
Camera.ShutterCallback shutterCallback;
Camera.PictureCallback jpegCallback;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
b1=(Button)findViewById(R.id.button);
b1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
takepicture();
}
});
}
public void takepicture() {
surfaceView = (SurfaceView) findViewById(R.id.surfaceView);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
jpegCallback = new PictureCallback() {
#Override
public void onPictureTaken(byte[] data, Camera camera) {
FileOutputStream outStream = null;
try {
outStream = new FileOutputStream(String.format("/sdcard/%d.jpg", System.currentTimeMillis()));
outStream.write(data);
outStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
}
Toast.makeText(getApplicationContext(), "Picture Saved", Toast.LENGTH_LONG).show();
refreshCamera();
}
};
}
public void captureImage(View v) throws IOException {
camera.takePicture(null, null, jpegCallback);
}
public void refreshCamera() {
if (surfaceHolder.getSurface() == null) {
return;
}
try {
camera.stopPreview();
} catch (Exception e) {
}
try {
camera.setPreviewDisplay(surfaceHolder);
camera.startPreview();
} catch (Exception e) {
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
public void surfaceCreated(SurfaceHolder holder) {
try {
camera = Camera.open();
} catch (RuntimeException e) {
System.err.println(e);
return;
}
Camera.Parameters param;
param = camera.getParameters();
param.setPreviewSize(352, 288);
camera.setParameters(param);
try {
camera.setPreviewDisplay(surfaceHolder);
camera.startPreview();
} catch (Exception e) {
System.err.println(e);
return;
}
}
#Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
refreshCamera();
}
#Override
public void surfaceDestroyed(SurfaceHolder holder) {
camera.stopPreview();
camera.release();
camera = null;
}
}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.example.test.MainActivity" >
<SurfaceView
android:id="#+id/surfaceView"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="camera"
android:id="#+id/button"
android:layout_centerHorizontal="true"
android:layout_marginTop="86dp" />
</RelativeLayout>
MANIFEST
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />

Update sharedpreference that uses checkbox

I want to update the changes when I uncheck and check the checkbox in the preference activity but when I press the back button it doesn't work. It only works when I close the activity and then open it
Main activity
public class MainActivity extends ActionBarActivity {
private ToggleButton togle;
private Camera camera;
private boolean isFlashOn;
private boolean hasFlash;
Parameters params;
private ShakeListener mShaker;
MediaPlayer mp;
ImageView anime;
int p=1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
anime = (ImageView) findViewById(R.id.Animation);
hasFlash = getApplicationContext().getPackageManager()
.hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);
if (!hasFlash) {
// device doesn't support flash
// Show alert message and close the application
AlertDialog alert = new AlertDialog.Builder(MainActivity.this)
.create();
alert.setTitle("Error");
alert.setMessage("Sorry, your device doesn't support flash light!");
alert.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// closing the application
finish(); }
});
alert.show();
return;}
getCamera();
togle = (ToggleButton) findViewById(R.id.ToggleButton01);
togle.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
boolean checked = ((ToggleButton) v).isChecked();
if (checked){
turnOffFlash();
}
else{
getCamera();
turnOnFlash();
}
}
});
SharedPreferences getprefs = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
boolean stopshake = getprefs.getBoolean("checkbox", true);
if (stopshake == true ){
mShaker = new ShakeListener(this);
mShaker.setOnShakeListener(new ShakeListener.OnShakeListener () {
public void onShake()
{ if (!isFlashOn) {
Toast.makeText(MainActivity.this, "On" , Toast.LENGTH_SHORT).show();
getCamera();
turnOnFlash();
}
else{
turnOffFlash();
Toast.makeText(MainActivity.this, "Off" , Toast.LENGTH_SHORT).show();
} }
});
}
}
private void getCamera() {
// TODO Auto-generated method stub
if (camera == null) {
try {
camera = Camera.open();
params = camera.getParameters();
} catch (RuntimeException e) {
Log.e("Camera Error. Failed to Open. Error: ", e.getMessage());
}
} }
private void turnOnFlash() {
if (!isFlashOn) {
if (camera == null || params == null) {
return;
}
// play sound
getCamera();
playSound();
params = camera.getParameters();
params.setFlashMode(Parameters.FLASH_MODE_TORCH);
camera.setParameters(params);
camera.startPreview();
isFlashOn = true;
anime.setImageResource(R.drawable.anim);
anime.post(new Runnable() {
#Override
public void run() {
AnimationDrawable frameAnimation =
(AnimationDrawable) anime.getDrawable();
frameAnimation.start();
}
});
// changing button/switch image
}
}
private void turnOffFlash() {
if (isFlashOn) {
if (camera == null || params == null) {
return;
}
// play sound
playSound();
params = camera.getParameters();
params.setFlashMode(Parameters.FLASH_MODE_OFF);
camera.setParameters(params);
camera.stopPreview();
camera.setPreviewCallback(null);
camera.release();
camera = null;
isFlashOn = false;
anime.setImageResource(R.drawable.off);
// changing button/switch image
}
}
private void playSound() {
// TODO Auto-generated method stub
if(isFlashOn){
mp = MediaPlayer.create(MainActivity.this, R.raw.off1);
}else{
mp = MediaPlayer.create(MainActivity.this, R.raw.on1);
}
mp.setOnCompletionListener(new OnCompletionListener() {
#Override
public void onCompletion(MediaPlayer mp) {
// TODO Auto-generated method stub
mp.release();
}
});
mp.start();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
Intent intent = new Intent(MainActivity.this, Prefsetting.class);
startActivity(intent);
return true;
}
return super.onOptionsItemSelected(item);
}
}
Preference activity
public class Prefsetting extends PreferenceActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.prefset);
}
}

You access SharedPreferences in the onCreate() of your MainActivity, which is only called when that activity is created from scratch (i.e. when you first start your app). As you (presumably) navigate to and from your Prefsetting Activity fairly quickly, MainActivity is likely only in a paused or stopped state when it is resumed. Take a look at the diagram here to see what happens to Activity classes as they move into and out of the foreground.
You have a couple of options. Either place this:
#Override
public void onResume() {
super.onResume();
SharedPreferences getprefs = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
boolean stopshake = getprefs.getBoolean("checkbox", true);
if (stopshake) {
mShaker = new ShakeListener(this);
mShaker.setOnShakeListener(new ShakeListener.OnShakeListener () {
public void onShake() {
if (!isFlashOn) {
Toast.makeText(MainActivity.this, "On" , Toast.LENGTH_SHORT).show();
getCamera();
turnOnFlash();
} else {
turnOffFlash();
Toast.makeText(MainActivity.this, "Off" , Toast.LENGTH_SHORT).show();
}
}
});
} else {
if (mShaker != null) {
mShaker.setOnShakeListener(null);
mShaker = null;
}
}
}
Into somewhere like onResume().
Or, use an EventBus like LocalBrodcastManager to update your Preferences when onPause() is called in your PreferenceActivity.

From the code snippet it appears that you never actually commit your changes to the SharedPreferences of the application. Somewhere in the code when that boolean is flipped you need to do something like this:
prefs.put("checkbox", currentBooleanState).commit();

Extending my Android Radio Application

Recently, I uploaded simple Radio Application to the Google Play Store. And it has kinda a lot of downloaders. But it was really simple and I want to extend that Radio App to the next level. What it has for now is only ONE radio station to choose. No next, no previous buttons to choose from more Radio Stations. What I really want to do is to extend it so the user can listen for more Radio Stations(not one, but about 6 more or so). So maybe I need to add Previous and Next buttons to the app so the user can actually do that. But there is a problem - I don't know how to do this.
This is MainActivity.java class :
public class MainActivity extends Activity {
static String radioTitle = "RadioLink1";
static String radioStreamURL = "http://108.61.73.117:8124";
Button playButton;
Button pauseButton;
Button stopButton;
TextView statusTextView, bufferValueTextView;
NotificationCompat.Builder notifyBuilder;
private SeekBar volumeSeekbar;
private AudioManager audioManager = null;
private RadioUpdateReceiver radioUpdateReceiver;
private RadioService radioServiceBinder;
// Notification
private static final int NOTIFY_ME_ID = 12345;
private NotificationManager notifyMgr = null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView titleTextView = (TextView) this
.findViewById(R.id.titleTextView);
titleTextView.setText(radioTitle);
playButton = (Button) this.findViewById(R.id.PlayButton);
pauseButton = (Button) this.findViewById(R.id.PauseButton);
stopButton = (Button) this.findViewById(R.id.StopButton);
playButton.setEnabled(true);
pauseButton.setEnabled(false);
stopButton.setEnabled(false);
pauseButton.setVisibility(View.INVISIBLE);
initControls();
statusTextView = (TextView) this
.findViewById(R.id.StatusDisplayTextView);
notifyMgr = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
showNotification();
setFont();
// Bind to the service
Intent bindIntent = new Intent(this, RadioService.class);
bindService(bindIntent, radioConnection, Context.BIND_AUTO_CREATE);
startService(new Intent(this, RadioService.class));
}
private void initControls() {
try {
audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
volumeSeekbar.setMax(audioManager
.getStreamMaxVolume(AudioManager.STREAM_MUSIC));
volumeSeekbar.setProgress(audioManager
.getStreamVolume(AudioManager.STREAM_MUSIC));
volumeSeekbar
.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
#Override
public void onStopTrackingTouch(SeekBar arg0) {
}
#Override
public void onStartTrackingTouch(SeekBar arg0) {
}
#Override
public void onProgressChanged(SeekBar arg0,
int progress, boolean arg2) {
audioManager.setStreamVolume(
AudioManager.STREAM_MUSIC, progress, 0);
}
});
} catch (Exception e) {
e.printStackTrace();
}
}
public void setFont() {
// Font path
String fontPath = "fonts/Christmas Card.ttf";
// text view label
TextView txtGhost = (TextView) findViewById(R.id.titleTextView);
// Loading Font Face
Typeface tf = Typeface.createFromAsset(getAssets(), fontPath);
// Applying font
txtGhost.setTypeface(tf);
}
public void onClickPlayButton(View view) {
radioServiceBinder.play();
}
public void onClickPauseButton(View view) {
radioServiceBinder.pause();
}
public void onClickStopButton(View view) {
radioServiceBinder.stop();
}
#Override
protected void onPause() {
super.onPause();
if (radioUpdateReceiver != null)
unregisterReceiver(radioUpdateReceiver);
}
#Override
protected void onResume() {
super.onResume();
/* Register for receiving broadcast messages */
if (radioUpdateReceiver == null)
radioUpdateReceiver = new RadioUpdateReceiver();
registerReceiver(radioUpdateReceiver, new IntentFilter(
RadioService.MODE_CREATED));
registerReceiver(radioUpdateReceiver, new IntentFilter(
RadioService.MODE_DESTROYED));
registerReceiver(radioUpdateReceiver, new IntentFilter(
RadioService.MODE_STARTED));
registerReceiver(radioUpdateReceiver, new IntentFilter(
RadioService.MODE_PREPARED));
registerReceiver(radioUpdateReceiver, new IntentFilter(
RadioService.MODE_PLAYING));
registerReceiver(radioUpdateReceiver, new IntentFilter(
RadioService.MODE_PAUSED));
registerReceiver(radioUpdateReceiver, new IntentFilter(
RadioService.MODE_STOPPED));
registerReceiver(radioUpdateReceiver, new IntentFilter(
RadioService.MODE_COMPLETED));
registerReceiver(radioUpdateReceiver, new IntentFilter(
RadioService.MODE_ERROR));
registerReceiver(radioUpdateReceiver, new IntentFilter(
RadioService.MODE_BUFFERING_START));
registerReceiver(radioUpdateReceiver, new IntentFilter(
RadioService.MODE_BUFFERING_END));
}
/* Receive Broadcast Messages from RadioService */
private class RadioUpdateReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(RadioService.MODE_CREATED)) {
showNotification();
} else if (intent.getAction().equals(RadioService.MODE_DESTROYED)) {
clearNotification();
} else if (intent.getAction().equals(RadioService.MODE_STARTED)) {
playButton.setEnabled(false);
pauseButton.setEnabled(false);
stopButton.setEnabled(true);
playButton.setVisibility(View.VISIBLE);
pauseButton.setVisibility(View.INVISIBLE);
updateStatus("Buffering...");
} else if (intent.getAction().equals(RadioService.MODE_PREPARED)) {
playButton.setEnabled(true);
pauseButton.setEnabled(false);
stopButton.setEnabled(false);
playButton.setVisibility(View.VISIBLE);
pauseButton.setVisibility(View.INVISIBLE);
updateStatus("Rady");
} else if (intent.getAction().equals(
RadioService.MODE_BUFFERING_START)) {
updateStatus("Buffering...");
} else if (intent.getAction().equals(
RadioService.MODE_BUFFERING_END)) {
updateStatus("Playing");
} else if (intent.getAction().equals(RadioService.MODE_PLAYING)) {
playButton.setEnabled(false);
pauseButton.setEnabled(true);
stopButton.setEnabled(true);
playButton.setVisibility(View.INVISIBLE);
pauseButton.setVisibility(View.VISIBLE);
showNotification();
updateStatus("Playing");
} else if (intent.getAction().equals(RadioService.MODE_PAUSED)) {
playButton.setEnabled(true);
pauseButton.setEnabled(false);
stopButton.setEnabled(true);
playButton.setVisibility(View.VISIBLE);
pauseButton.setVisibility(View.INVISIBLE);
updateStatus("Paused");
} else if (intent.getAction().equals(RadioService.MODE_STOPPED)) {
playButton.setEnabled(true);
pauseButton.setEnabled(false);
stopButton.setEnabled(false);
playButton.setVisibility(View.VISIBLE);
pauseButton.setVisibility(View.INVISIBLE);
updateStatus("Stopped");
clearNotification();
} else if (intent.getAction().equals(RadioService.MODE_COMPLETED)) {
playButton.setEnabled(true);
pauseButton.setEnabled(false);
stopButton.setEnabled(false);
playButton.setVisibility(View.VISIBLE);
pauseButton.setVisibility(View.INVISIBLE);
updateStatus("Stopped");
} else if (intent.getAction().equals(RadioService.MODE_ERROR)) {
playButton.setEnabled(true);
pauseButton.setEnabled(false);
stopButton.setEnabled(false);
playButton.setVisibility(View.VISIBLE);
pauseButton.setVisibility(View.INVISIBLE);
updateStatus("Error");
}
}
}
public void updateStatus(String status) {
try {
if (notifyBuilder != null && notifyMgr != null) {
notifyBuilder.setContentText(status).setWhen(0);
notifyMgr.notify(NOTIFY_ME_ID, notifyBuilder.build());
}
statusTextView.setText(status);
} catch (Exception e) {
e.printStackTrace();
}
}
public void showNotification() {
notifyBuilder = new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.ic_launcher)
.setContentTitle(radioTitle).setContentText("");
Intent resultIntent = new Intent(this, MainActivity.class);
resultIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
resultIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
stackBuilder.addParentStack(MainActivity.class);
stackBuilder.addNextIntent(resultIntent);
PendingIntent resultPendingIntent = stackBuilder.getPendingIntent(0,
PendingIntent.FLAG_UPDATE_CURRENT);
notifyBuilder.setContentIntent(resultPendingIntent);
notifyMgr = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notifyMgr.notify(NOTIFY_ME_ID, notifyBuilder.build());
}
public void clearNotification() {
notifyMgr.cancel(NOTIFY_ME_ID);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main_menu, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.about:
Intent i = new Intent(this, AboutActivity.class);
startActivity(i);
return true;
}
return super.onOptionsItemSelected(item);
}
// Handles the connection between the service and activity
private ServiceConnection radioConnection = new ServiceConnection() {
public void onServiceConnected(ComponentName className, IBinder service) {
radioServiceBinder = ((RadioService.RadioBinder) service)
.getService();
}
public void onServiceDisconnected(ComponentName className) {
radioServiceBinder = null;
}
};
}
and RadioService.java class:
public class RadioService extends Service implements OnErrorListener, OnCompletionListener, OnPreparedListener, OnInfoListener {
private MediaPlayer mediaPlayer;
private String radioStreamURL = MainActivity.radioStreamURL;
public static final String MODE_CREATED = "CREATED";
public static final String MODE_DESTROYED = "DESTROYED";
public static final String MODE_PREPARED = "PREPARED";
public static final String MODE_STARTED = "STARTED";
public static final String MODE_PLAYING = "PLAYING";
public static final String MODE_PAUSED = "PAUSED";
public static final String MODE_STOPPED = "STOPPED";
public static final String MODE_COMPLETED = "COMPLETED";
public static final String MODE_ERROR = "ERROR";
public static final String MODE_BUFFERING_START = "BUFFERING_START";
public static final String MODE_BUFFERING_END = "BUFFERING_END";
private boolean isPrepared = false;
private final IBinder binder = new RadioBinder();
#Override
public void onCreate() {
/* Create MediaPlayer when it starts for first time */
mediaPlayer = new MediaPlayer();
mediaPlayer.setOnCompletionListener(this);
mediaPlayer.setOnErrorListener(this);
mediaPlayer.setOnPreparedListener(this);
mediaPlayer.setOnInfoListener(this);
sendBroadcast(new Intent(MODE_CREATED));
}
#Override
public void onDestroy() {
super.onDestroy();
mediaPlayer.stop();
mediaPlayer.reset();
isPrepared = false;
sendBroadcast(new Intent(MODE_DESTROYED));
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
sendBroadcast(new Intent(MODE_STARTED));
/* Starts playback at first time or resumes if it is restarted */
if(mediaPlayer.isPlaying())
sendBroadcast(new Intent(MODE_PLAYING));
else if(isPrepared) {
sendBroadcast(new Intent(MODE_PAUSED));
}
else
prepare();
return Service.START_STICKY;
}
#Override
public void onPrepared(MediaPlayer _mediaPlayer) {
/* If radio is prepared then start playback */
sendBroadcast(new Intent(MODE_PREPARED));
isPrepared = true;
play();
}
#Override
public void onCompletion(MediaPlayer mediaPlayer) {
/* When no stream found then complete the playback */
mediaPlayer.stop();
mediaPlayer.reset();
isPrepared = false;
sendBroadcast(new Intent(MODE_COMPLETED));
}
public void prepare() {
/* Prepare Async Task - starts buffering */
try {
mediaPlayer.setDataSource(radioStreamURL);
mediaPlayer.prepareAsync();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public void play() {
if(isPrepared) {
mediaPlayer.start();
System.out.println("RadioService: play");
sendBroadcast(new Intent(MODE_PLAYING));
}
else
{
sendBroadcast(new Intent(MODE_STARTED));
prepare();
}
}
public void pause() {
mediaPlayer.pause();
System.out.println("RadioService: pause");
sendBroadcast(new Intent(MODE_PAUSED));
}
public void stop() {
mediaPlayer.stop();
mediaPlayer.reset();
isPrepared = false;
System.out.println("RadioService: stop");
sendBroadcast(new Intent(MODE_STOPPED));
}
#Override
public boolean onInfo(MediaPlayer mp, int what, int extra) {
/* Check when buffering is started or ended */
if(what == MediaPlayer.MEDIA_INFO_BUFFERING_START) {
sendBroadcast(new Intent(MODE_BUFFERING_START));
}
else if(what == MediaPlayer.MEDIA_INFO_BUFFERING_END) {
sendBroadcast(new Intent(MODE_BUFFERING_END));
}
return false;
}
#Override
public boolean onError(MediaPlayer mp, int what, int extra) {
sendBroadcast(new Intent(MODE_ERROR));
switch (what) {
case MediaPlayer.MEDIA_ERROR_NOT_VALID_FOR_PROGRESSIVE_PLAYBACK:
Log.v("ERROR","MEDIA ERROR NOT VALID FOR PROGRESSIVE PLAYBACK " + extra);
break;
case MediaPlayer.MEDIA_ERROR_SERVER_DIED:
Log.v("ERROR","MEDIA ERROR SERVER DIED " + extra);
break;
case MediaPlayer.MEDIA_ERROR_UNKNOWN:
Log.v("ERROR","MEDIA ERROR UNKNOWN " + extra);
break;
}
return false;
}
#Override
public IBinder onBind(Intent intent) {
return binder;
}
/* Allowing activity to access all methods of RadioService */
public class RadioBinder extends Binder {
RadioService getService() {
return RadioService.this;
}
}
}
And this layout:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#4a4a4a"
tools:context=".MainActivity" >
<LinearLayout
android:id="#+id/player_header_bg"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true" >
<TextView
android:id="#+id/titleTextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="48dp"
android:background="#color/bgcolor"
android:gravity="center"
android:text="Classic Christmas Radio"
android:textAlignment="center"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="#c0413b"
android:textSize="40sp" />
</LinearLayout>
<ImageView
android:id="#+id/imageView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerInParent="true"
android:layout_marginBottom="120dp"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:layout_marginTop="110dp"
android:src="#drawable/cover" />
<TextView
android:id="#+id/StatusDisplayTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/PauseButton"
android:layout_alignLeft="#+id/imageView1"
android:layout_alignRight="#+id/imageView1"
android:gravity="center"
android:text="Unknown" />
<Button
android:id="#+id/PauseButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#id/StatusDisplayTextView"
android:layout_alignParentBottom="true"
android:layout_marginBottom="0.0dip"
android:background="#drawable/btn_pause"
android:onClick="onClickPauseButton" />
<Button
android:id="#+id/PlayButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#id/StatusDisplayTextView"
android:layout_alignParentBottom="true"
android:layout_marginBottom="0.0dip"
android:background="#drawable/btn_play"
android:onClick="onClickPlayButton" />
<Button
android:id="#+id/StopButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignRight="#id/StatusDisplayTextView"
android:layout_marginBottom="0.0dip"
android:background="#drawable/btn_stop"
android:onClick="onClickStopButton" />
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_toRightOf="#+id/PauseButton"
android:background="#drawable/btn_previous" />
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_toRightOf="#+id/button1"
android:background="#drawable/btn_next" />
</RelativeLayout>
I actually didn't write all the code and that's why I can't get my head straight to the problem solution. I just extended given code for my needs but now I don't really now how to implement Previous and Next buttons to navigate through different Radio Stations. What I want from you guys is to maybe give me some ideas or just set me on the road how can I add this functionality to this app. How can I get more than one stream (in this case from SHOUTcast) and add this navigation through them. I hope I didn't breaking the StackOverflow rules of asking this kind of question. Thank you and appreciate any help.
UPDATE:
In the MainActivity:
static String radioTitle = "RadioStation1";
static String radioStreamURL = "http://108.61.73.117:8124";
static String radioTitle2 = "RadioStation2";
static String radioStreamURL2 = "http://108.61.73.117:8124";
static String radioTitle3 = "RadioStation3";
static String radioStreamURL3 = "http://108.61.73.117:8124";
...........
nextButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
});
prevButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
});
And the RadioService class:
private String radioStreamURL = MainActivity.radioStreamURL;
private String radioStreamURL2 = MainActivity.radioStreamURL2;
private String radioStreamURL3 = MainActivity.radioStreamURL3;
...............
public void prepare() {
/* Prepare Async Task - starts buffering */
try {
mediaPlayer.setDataSource(radioStreamURL);
mediaPlayer.setDataSource(radioStreamURL2);
mediaPlayer.setDataSource(radioStreamURL3);
mediaPlayer.prepareAsync();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}

Look at your method at RadioService.java
public void prepare() {
/* Prepare Async Task - starts buffering */
try {
mediaPlayer.setDataSource(radioStreamURL);
mediaPlayer.prepareAsync();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
Here you set the URL to your radio stream, the fast way to change your code without knowing all your code is to alter radioStreamURL variable.
private String radioStreamURL = MainActivity.radioStreamURL;
If you have some static information about the radios you want to use, just change this String to a List and add all the Radio's URL you want.
Add a Next and Preview button to your layout, set the listener to call your RadioService with this function, something like this:
MainActivity
private static int station = 0;//Not right, just to show
public void onNextStationClicked(){
radioServiceBinder.changeStation(++station);
}
RadioService
public static final String MODE_STATION_CHANGE = "STATION_CHANGE";
public void changeStation(int stationIndex){
radioStreamURL = MainActivity.radioStreamURL.get(stationIndex);
stop();
play();
}
This is just an idea, the code isn't the best but with a little work should work...
UPDATE
Try change your code to this:
RadioService
private List<String> radioStreamURL = new ArrayList<String>
private int radioStreamingIndex = 0;
then on your constructor add this
#Override
public void onCreate() {
radioStreamURL.add(radioStreamURL);
radioStreamURL.add(radioStreamURL2);
radioStreamURL.add(radioStreamURL3);
// etc
}
public void prepare() {
/* Prepare Async Task - starts buffering */
try {
mediaPlayer.setDataSource(radioStreamURL.get(radioStreamingIndex));
mediaPlayer.prepareAsync();
} catch (Exception e) {
e.printStackTrace();
}
}
public void nextStation(){
changeStation(radioStreamingIndex+1);
}
public void prevStation(){
changeStation(radioStreamingIndex-1);
}
private void changeStation(int stationIndex){
if(stationIndex > 0 && stationIndex < radioStreamURL.size()){
radioStreamingIndex = stationIndex;
stop();
play();
}
}
MainActivity
nextButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
radioServiceBinder.nextStation();
}
});
prevButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
radioServiceBinder.prevStation();
}
});

I am not too experience in Android development, but you may need a complex algorithm developed if you would like to follow Spotify and Pandora's steps in the sense that the radio stations are created in relation to the listener's genre, etc.

Buttons not being shown when TextureView is implemented

So I implemented a TextureView through code. Now the buttons however are not being shown, and the onclick listener is giving me a null pointer exception. What am I doing wrong
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_camera);
mTextureView = new TextureView(this);
mTextureView.setSurfaceTextureListener(this);
setContentView(mTextureView);
if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)){
Toast.makeText(this, "No camera on device", Toast.LENGTH_LONG).show();
}else {
cameraId = findFrontFacingCamera();
if (cameraId<0){
Toast.makeText(this, "no front camera", Toast.LENGTH_LONG).show();
}else{
camera = Camera.open(cameraId);
Toast.makeText(this, "We have camera", Toast.LENGTH_LONG).show();
}
}
findViewById(R.id.buttonMenu).setOnClickListener(
new View.OnClickListener() {
#Override
public void onClick(View v) {
// No account, load new account view
Intent intent = new Intent(CameraActivity.this,
MenuActivity.class);
startActivityForResult(intent, 0);
}
});
}
public void onSurfaceTextureAvailable(SurfaceTexture surface, int width,
int height) {
camera = Camera.open();
Camera.Size previewSize = camera.getParameters().getPreviewSize();
mTextureView.setLayoutParams(new FrameLayout.LayoutParams(
30, 30, Gravity.CENTER));
try {
camera.setPreviewTexture(surface);
} catch (IOException t) {
}
camera.startPreview();
mTextureView.setAlpha(0.8f);
mTextureView.setRotation(45.0f);
}
public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width,
int height) {
// Ignored, the Camera does all the work for us
}
public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
camera.stopPreview();
camera.release();
return true;
}
public void onSurfaceTextureUpdated(SurfaceTexture surface) {
// Called whenever a new frame is available and displayed in the
rotation += 1.0f;
if (rotation > 360) {
rotation = 0;
}
mTextureView.setRotation(rotation);
}
#Override
protected void onPause() {
if (camera != null) {
camera.release();
camera = null;
}
super.onPause();
}
public void onClick(View view) {
if (camera == null){
Toast.makeText(this, "Camera is null", Toast.LENGTH_LONG).show();
}else{
camera.takePicture(null, null,
new PhotoHandler(getApplicationContext(), mPreferences ));
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.camera, menu);
return true;
}
}
xml file:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".CameraActivity" >
<Button
android:id="#+id/buttonMenu"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/capture"
android:layout_alignBottom="#+id/capture"
android:layout_alignParentLeft="true"
android:layout_marginLeft="22dp"
android:text="menu" />
<Button
android:id="#+id/capture"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="24dp"
android:onClick="onClick"
android:text="Take pic" />
</RelativeLayout>

you should add the TextureView you created through code in the activity_camera.xml. You should retrieve the root for activity_camera.xml (RelativeLayout) with findViewById and call addView(mTextureView) on the RelativeLayout instance you get. Calling setContentView(mTextureView) will simply replace the views hierarchy.