Develop Reference

Trying to call method from MainActivity in Another Activity it is me leading to error

I have Recycler ListView which I show in MainActivity and the first item it is as selected, I have done to click for another items but the last stays clicked and when I try to take this recycler view to show me in next Activity it doesn't work.
The first item it is selected but I have a click method which when click an image makes as selected but when I click a new image this works but the first item stays as selected so continues for others images. I want only a image to be selected.
I don't want to write twice the same code.
Is it good if I have a class only for this method which I can use everytime I want.
The id of recycler view list it is the same on both xml's.
If you have any suggestion for my question please let me know.
This is the adapter for the RecyclerView.
public class ListViewAdapter extends RecyclerView.Adapter<ListViewAdapter.ViewHolder>{
private int selectedItem;
private ArrayList<Integer> mImages = new ArrayList<>();
private ArrayList<String> mSearchUrl = new ArrayList<>();
private Context mContext;
public ListViewAdapter(ArrayList<Integer> images, ArrayList<String> SearchUrl, Context context) {
mImages = images;
mContext = context;
mSearchUrl = SearchUrl;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.s_engine_item, viewGroup, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull final ViewHolder viewHolder, final int i) {
selectedItem = 0;
if (selectedItem == i) {
viewHolder.image.setBackgroundColor(Color.parseColor("#30000000"));
}
Glide.with(mContext).load(mImages.get(i))
.into(viewHolder.image);
viewHolder.searchUrl.setText(mSearchUrl.get(i));
viewHolder.image.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
viewHolder.image.setBackgroundColor(Color.parseColor("#30000000"));
selectedItem = i;
}
});
}
#Override
public int getItemCount() {
return mImages.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
ImageView image;
TextView searchUrl;
public ViewHolder(#NonNull View itemView) {
super(itemView);
image = itemView.findViewById(R.id.ivEngine);
searchUrl = itemView.findViewById(R.id.ivEngineText);
}
}
}
This is the method in MainActivity.class
public void intSearch() {
mImages.add(R.drawable.s_bing);
mSearchUrl.add("https://www.bing.com/search?q=");
mImages.add(R.drawable.s_google);
mSearchUrl.add("https://www.google.com/search?q=");
mImages.add(R.drawable.s_yahoo);
mSearchUrl.add("www.yahoo.com");
mImages.add(R.drawable.amazon_white256);
mSearchUrl.add("www.amazon.com");
mImages.add(R.drawable.amazon_white256);
mSearchUrl.add("www.amazon.com");
mImages.add(R.drawable.amazon_white256);
mSearchUrl.add("www.amazon.com");
initRecyclerView();
}
private void initRecyclerView() {
LinearLayoutManager layoutManager = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);
RecyclerView recyclerView = findViewById(R.id.lvEngines);
recyclerView.setLayoutManager(layoutManager);
ListViewAdapter adapter = new ListViewAdapter(mImages, mSearchUrl, this);
recyclerView.setAdapter(adapter);
}
This is the button which takes to another activity.
btnSearch.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String newEntry = searchPlugin.getText().toString();
Cursor data = mDatabaseHelper.getData();
AddHistory(newEntry);
getFragmentRefreshListener().onRefresh();
Intent intent = new Intent(MainActivity.this, ActivitySearchEngine.class);
intent.putExtra("name", newEntry);
intent.putExtra("test", mSearchUrl.get(0));
startActivityForResult(intent, 2);
}
});
This is the another activity
public class ActivitySearchEngine extends Activity implements
SwipeRefreshLayout.OnRefreshListener {
public ImageView mHome;
public EditText searchPlugin;
public WebView webView;
Button btnSearch;
public ImageButton clearSearch, exitButton;
public ImageView favIcon;
public ProgressBar loadIcon;
String text;
SwipeRefreshLayout refreshLayout;
DatabaseHelper mDatabaseHelper;
private String selectedName;
private int selectedID;
private String selectedSearchUrl;
RecyclerView mListView;
MainActivity mainActivity = new MainActivity();
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_search_result);
mHome = findViewById(R.id.imgBtnHome);
searchPlugin = findViewById(R.id.etSearch);
webView = findViewById(R.id.webView);
clearSearch = findViewById(R.id.btnClearSearch);
btnSearch = findViewById(R.id.btnSearch);
favIcon = findViewById(R.id.imgViewFavIcon);
loadIcon = findViewById(R.id.progressBarIcon);
exitButton = findViewById(R.id.imgBtnStopLoad);
refreshLayout = findViewById(R.id.refreshLayout);
mListView = findViewById(R.id.lvEngines);
refreshLayout.setOnRefreshListener(this);
mDatabaseHelper = new DatabaseHelper(this);
mainActivity.intSearch(); // Here it is the error
Activity.ActivitySearchEngine}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.Window$Callback android.view.Window.getCallback()' on a null object reference
Intent receivedIntent = getIntent();
selectedName = receivedIntent.getStringExtra("name");
selectedID = receivedIntent.getIntExtra("id",-1); //NOTE: -1 is just the default value
selectedSearchUrl = receivedIntent.getStringExtra("test");
searchPlugin.setText(selectedName);
loadIcon.setVisibility(View.VISIBLE);
webView.setWebViewClient(new WebViewClient());
webView.getSettings().setJavaScriptEnabled(true);
webView.loadUrl("www.bing.com/search?=" + selectedName);
webView.setWebChromeClient(new WebChromeClient() {
#Override
public void onProgressChanged(WebView view, int newProgress) {
super.onProgressChanged(view, newProgress);
}
#Override
public void onReceivedIcon(WebView view, Bitmap icon) {
super.onReceivedIcon(view, icon);
favIcon.setImageBitmap(icon);
}
});
webView.setWebViewClient(new WebViewClient() {
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
loadIcon.setVisibility(View.VISIBLE);
favIcon.setVisibility(View.GONE);
}
public void onPageFinished(WebView view, String url) {
try {
if (loadIcon.getVisibility() == View.VISIBLE) {
loadIcon.setVisibility(View.GONE);
favIcon.setVisibility(View.VISIBLE);
btnSearch.setVisibility(View.GONE);
mHome.setVisibility(View.VISIBLE);
exitButton.setVisibility(View.GONE);
clearSearch.setVisibility(View.VISIBLE);
favIcon.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
onRefresh();
}
});
}
} catch (Exception exception) {
exception.printStackTrace();
}
}
});
searchPlugin.addTextChangedListener(new TextWatcher() {
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
#Override
public void afterTextChanged(Editable s) {
processButtonByTextLength();
}
});
mHome.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
searchPlugin.setText(null);
finish();
}
});
clearSearch.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
searchPlugin.setText("");
}
});
public void processButtonByTextLength() {
String inputText = searchPlugin.getText().toString();
if(inputText.length() > 0) {
btnSearch.setVisibility(View.VISIBLE);
mHome.setVisibility(View.GONE);
clearSearch.setVisibility(View.VISIBLE);
favIcon.setVisibility(View.VISIBLE);
loadIcon.setVisibility(View.GONE);
exitButton.setVisibility(View.GONE);
} else if(inputText.length() == 0) {
btnSearch.setVisibility(View.GONE);
mHome.setVisibility(View.VISIBLE);
clearSearch.setVisibility(View.GONE);
}
}
#Override
public void onRefresh() {
webView.reload();
refreshLayout.setRefreshing(false);
}
}
This is the photo with RecyclerView at MainActivity.class
Photo of another Activity

Android: Back click exists from app when using YouTube API

I am using Youtube API for android. Below is the code
MainActivity.java
public class MainActivity extends AppCompatActivity implements YouTubePlayer.OnInitializedListener {
private static final int RECOVERY_REQUEST = 1;
private YouTubePlayerView youTubeView;
private YouTubePlayerFragment youTubePlayerFragment;
private YouTubePlayer player;
private boolean isFullScreen;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// youTubeView = (YouTubePlayerView) findViewById(R.id.youtube_view);
// youTubeView.initialize(Config.YOUTUBE_API_KEY, this);
youTubePlayerFragment = (YouTubePlayerFragment) getFragmentManager()
.findFragmentById(R.id.youtube_fragment);
youTubePlayerFragment.initialize(Config.YOUTUBE_API_KEY, this);
}
#Override
public void onInitializationSuccess(Provider provider, YouTubePlayer player, boolean wasRestored) {
if (!wasRestored) {
this.player = player;
this.player.cueVideo("fhWaJi1Hsfo"); // Plays https://www.youtube.com/watch?v=fhWaJi1Hsfo
// player.setPlayerStyle(YouTubePlayer.PlayerStyle.CHROMELESS);
player.setOnFullscreenListener(new YouTubePlayer.OnFullscreenListener() {
#Override
public void onFullscreen(boolean b) {
isFullScreen = true;
}
});
}
}
#Override
public void onInitializationFailure(Provider provider, YouTubeInitializationResult errorReason) {
if (errorReason.isUserRecoverableError()) {
errorReason.getErrorDialog(this, RECOVERY_REQUEST).show();
} else {
String error = String.format(getString(R.string.player_error), errorReason.toString());
Toast.makeText(this, error, Toast.LENGTH_LONG).show();
}
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == RECOVERY_REQUEST) {
// Retry initialization if user performed a recovery action
getYouTubePlayerProvider().initialize(Config.YOUTUBE_API_KEY, this);
}
}
protected Provider getYouTubePlayerProvider() {
return youTubeView;
}
#Override
public void onBackPressed() {
Toast.makeText(this,"Back pressed",Toast.LENGTH_LONG).show();
if(isFullScreen)
{
player.setFullscreen(false);
}
else
{
super.onBackPressed();
}
}
}
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"
tools:context=".MainActivity">
<!--<com.google.android.youtube.player.YouTubePlayerView-->
<!--android:id="#+id/youtube_view"-->
<!--android:layout_width="match_parent"-->
<!--android:layout_height="wrap_content"/>-->
<fragment
android:id="#+id/youtube_fragment"
android:name="com.google.android.youtube.player.YouTubePlayerFragment"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</RelativeLayout>
When the Full Screen is visible and if the user clicked back, I want my Activity to be displayed. Instead what is happening now is the back button exists from the app.
How can I fix this?
UPDATE
I Identified the error, inside the setOnFullScreenListener it was never identified the app is in Full screen, even though it is. I tried forcing the boolean into true, but it ended up crashing saying the player is null

I'm not sure but in your onFullScreen() override method, you have set
isFullScreen = true;
Rather, use
isFullScreen = b;
Hope this helps.

I found the answer, just remove the if condition in onInitializationSuccess. Below is the code.
public class MainActivity extends AppCompatActivity implements YouTubePlayer.OnInitializedListener {
private static final int RECOVERY_REQUEST = 1;
private YouTubePlayerView youTubeView;
private YouTubePlayerFragment youTubePlayerFragment;
private YouTubePlayer player;
private boolean isFullScreen;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// youTubeView = (YouTubePlayerView) findViewById(R.id.youtube_view);
// youTubeView.initialize(Config.YOUTUBE_API_KEY, this);
youTubePlayerFragment = (YouTubePlayerFragment) getFragmentManager()
.findFragmentById(R.id.youtube_fragment);
youTubePlayerFragment.initialize(Config.YOUTUBE_API_KEY, this);
}
#Override
public void onInitializationSuccess(Provider provider, YouTubePlayer player, boolean wasRestored) {
this.player = player;
this.player.cueVideo("fhWaJi1Hsfo"); // Plays https://www.youtube.com/watch?v=fhWaJi1Hsfo
// player.setPlayerStyle(YouTubePlayer.PlayerStyle.CHROMELESS);
this.player.setOnFullscreenListener(new YouTubePlayer.OnFullscreenListener() {
#Override
public void onFullscreen(boolean b) {
isFullScreen = b;
}
});
}
#Override
public void onInitializationFailure(Provider provider, YouTubeInitializationResult errorReason) {
if (errorReason.isUserRecoverableError()) {
errorReason.getErrorDialog(this, RECOVERY_REQUEST).show();
} else {
String error = String.format(getString(R.string.player_error), errorReason.toString());
Toast.makeText(this, error, Toast.LENGTH_LONG).show();
}
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == RECOVERY_REQUEST) {
// Retry initialization if user performed a recovery action
getYouTubePlayerProvider().initialize(Config.YOUTUBE_API_KEY, this);
}
}
protected Provider getYouTubePlayerProvider() {
return youTubeView;
}
#Override
public void onBackPressed() {
if(isFullScreen)
{
Toast.makeText(this,"Full Screen",Toast.LENGTH_LONG).show();
player.setFullscreen(false);
}
else
{
Toast.makeText(this,"Not Full Screen",Toast.LENGTH_LONG).show();
super.onBackPressed();
}
}
}

Screen turns white after expanding to fullscreen

While debugging on USB I just wanted to expand WebView to fullscreen. Unfortunately, white screen appeared and nothing after it. I really do not know what to do. I made CustomView and everything seemed fine. Here is my code:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
filmkey = "<iframe width=\"96%\" height=\"96%\" src=\"https://www.youtube.com/embed/EtMOgsWEAmQ\" frameborder=\"0\" allowfullscreen></iframe>";
screen=(WebView)findViewById(R.id.webView);
screen.getSettings().setJavaScriptEnabled(true);
String myvideokey = filmkey;
screen.loadData(myvideokey, "text/html", "utf-8");
screen.setWebChromeClient(new WebChromeClient(){
#Override
public void onShowCustomView(View view, CustomViewCallback callback) {
super.onShowCustomView(view, callback);
}
#Override
public void onHideCustomView() {
super.onHideCustomView();
}
});
}

try the following Code. In this on full screen i created a View which will become full Screen.
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (savedInstanceState != null) {
screen.restoreState(savedInstanceState);
}
setContentView(R.layout.activity_support);
filmkey = "<iframe width=\"96%\" height=\"96%\" src=\"https://www.youtube.com/embed/EtMOgsWEAmQ\" frameborder=\"0\" allowfullscreen></iframe>";
screen=(WebView)findViewById(R.id.webview);
screen.getSettings().setJavaScriptEnabled(true);
String myvideokey = filmkey;
screen.loadData(myvideokey, "text/html", "utf-8");
CustomWebChromeClient custom = new CustomWebChromeClient();
screen.setWebChromeClient(custom);
}
and the custom WebChromeClient is
class `CustomWebChromeClient` extends WebChromeClient{
#Override
public void onShowCustomView(View view, final CustomViewCallback callback) {
super.onShowCustomView(view, callback);
Dialog dialog = new Dialog(SupportActivity.this, android.R.style.Theme_Black_NoTitleBar_Fullscreen);
view.setBackgroundColor(Color.TRANSPARENT);
dialog.setContentView(view);
dialog.setOnDismissListener(new DialogInterface.OnDismissListener() {
#Override
public void onDismiss(DialogInterface dialog) {
callback.onCustomViewHidden();
}
});
dialog.show();
}
#Override
public void onHideCustomView() {
super.onHideCustomView();
}
}
and also make sure you use all these methods in the activity to handle with the data in webView.
#Override
protected void onResume() {
super.onResume();
screen.onResume();
}
#Override
protected void onPause() {
super.onPause();
screen.onPause();
}
#Override
protected void onStop() {
super.onStop();
screen.stopLoading();
}
#Override
protected void onDestroy() {
super.onDestroy();
screen.destroy();
}
#Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
screen.saveState(outState);
}
I hope it helps.

Android webview app won't load my form

Hi i've been searching a lot but couldn't find anything that could help.
I am creating an android app for our existing website. The website itself will load, but the main form where users can sign in won't load. Does anyone have any idea how this happens?
The website is https://app.one-2-ten.com/v2
p.s. This is the first time I am making an android app so sorry if its an obvious solution.
ProgressBar progressBar;
WebView webView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
progressBar = (ProgressBar) findViewById(R.id.progressBar);
webView = (WebView) findViewById(R.id.webView);
if (savedInstanceState != null) {
webView.restoreState(savedInstanceState);
}
else{
webView.getSettings() .setJavaScriptEnabled(true);
webView.getSettings() .setSupportZoom(false);
webView.getSettings() .setBuiltInZoomControls(false);
webView.getSettings() .setLoadWithOverviewMode(true);
webView.getSettings() .setUseWideViewPort(true);
webView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
webView.setWebViewClient(new ourViewClient());
webView.Settings.AllowContentAccess = true;
webView.setWebChromeClient(new WebChromeClient(){
public void onProgressChanged (WebView view, int progress){
progressBar.setProgress(progress);
if(progress < 100 && progressBar.getVisibility() == ProgressBar.GONE){
progressBar.setVisibility(ProgressBar.VISIBLE);
}if(progress == 100){
progressBar.setVisibility(ProgressBar.GONE);
}
}
}
);}
String data = getIntent() .getDataString();
if(Intent.ACTION_VIEW.equals(getIntent() .getAction())){
webView.loadUrl(data);
}else{
webView.loadUrl("https://one2ten-system.parseapp.com/v2");
}
}
public class ourViewClient extends WebViewClient {
#Override
public boolean shouldOverrideUrlLoading(WebView v, String url) {
if (url.contains("one2ten-system.parseapp.com/v2")) {
v.loadUrl(url);
CookieManager.getInstance().setAcceptCookie(true);
} else {
Uri uri = Uri.parse(url);
startActivity(Intent.createChooser(new Intent(Intent.ACTION_VIEW, uri), "Choose browser"));
}
return true;
}
#Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
}
}
#Override
public void onBackPressed() {
if(webView.canGoBack()) {
webView.goBack();
} else {
super.onBackPressed();
}
}
#Override
public void onSaveInstanceState(Bundle outState){
super.onSaveInstanceState(outState);
webView.saveState(outState);
}
}

I've found what my issue was, I forgot to add the following line: webView.getSettings().setDomStorageEnabled(true);
This enables the browser to store user data from forms for example, which it needs because you land on a login page.
If my answer is incomplete please let me know!
Thanks

Viewpager setCurrentItem() doesn't update onPageSelected()

When I swipe between questions, it loads current page number correctly
BUT when I use next button, first click doesnt loads pagenumber ( I mean onPageSelected() doesnt work.) second and other clicks loads content but it loads 1 page previous.
#Override
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.activity_main);
mPager = (ViewPager)findViewById(R.id.pager);
QuestionPagerAdapter mAdapter = new QuestionPagerAdapter();
mPager.setAdapter(mAdapter);
OnPageChangeListener pageChangeListener = new OnPageChangeListener() {
#Override
public void onPageScrollStateChanged(int arg0) { }
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) { }
#Override
public void onPageSelected(int position) {
tv.setText( mPager.getCurrentItem()+"");
}
};
mPager.setOnPageChangeListener(pageChangeListener);
Question.next.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View view) {
mPager.setCurrentItem(getItem(+1));
}
}
private int getItem(int i) {
int a = mPager.getCurrentItem();
i += a;
return i;
}
});

Why not just doing this in your listener:
mPager.setCurrentItem(mPager.getCurrentItem() + 1);