Generate Random Characters in Android Studio using Broadcast

Generate Random Characters in Android Studio using Broadcast - java

Working on an app that is supposed to generate random characters via a broadcast. I need to broadcast the random characters generated by my custom service, so that the main activity registered to intercept the broadcast can get the random numbers and display them on an EditText. The layout is shown here: app layout
The start button will trigger the random character generator service. The EditText will display the random numbers generated in real time (without any button press). The stop button will stop the service. The EditText won’t display any numbers. I have created a service(RandomCharacterService) and registered it in my manifest. Upon running the app, my app crashes. I am sure it is because I did not register my broadcast in my manifest, but I do not understand how to do that. And perhaps there is something wrong with how I am handling the broadcast in my main activity. In my button click method for the start button, I tried to do a for-loop, but this resulted in the app crashing as well.
AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.cs7455rehmarazzaklab8">
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service android:name=".RandomCharacterService"></service>
</application>
MainActivityjava:
package com.example.cs7455rehmarazzaklab8;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.IBinder;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.content.BroadcastReceiver;
import android.content.Intent;
import android.content.IntentFilter;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.support.constraint.ConstraintLayout;
import android.support.v4.content.LocalBroadcastManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.widget.Button;
import android.widget.Toast;
import java.util.Random;
public class MainActivity extends AppCompatActivity
{
private Button btnStart, btnStop;
private EditText myTV;
private Intent serviceIntent;
private RandomCharacterService myService;
private ServiceConnection myServiceConnection;
private boolean isServiceOn; //checks if the service is on
private int myRandomCharacter;
char MyRandomCharacter = (char)myRandomCharacter;
private boolean isRandomGeneratorOn;
private final int MIN = 65;
char m = (char)MIN;
private final int MAX = 26;
char x = (char)MAX;
private final String TAG = "Random Char Service: ";
private final String alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
private Context mContext;
private Random mRandom = new Random();
// Initialize a new BroadcastReceiver instance
private BroadcastReceiver mRandomCharReceiver = new BroadcastReceiver()
{
#Override
public void onReceive(Context context, Intent intent) {
// Get the received random number
myRandomCharacter = intent.getIntExtra("RandomCharacter",-1);
// Display a notification that the broadcast received
Toast.makeText(context,"Received : " + myRandomCharacter,Toast.LENGTH_SHORT).show();
}
};
#Override
protected void onCreate(Bundle savedInstanceState)
{
requestWindowFeature(Window.FEATURE_ACTION_BAR);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Get the application context
mContext = getApplicationContext();
btnStart = (Button) findViewById(R.id.StartButton);
btnStop = (Button) findViewById(R.id.StopButton);
myTV = (EditText)findViewById(R.id.RandomCharText);
// Register the local broadcast
LocalBroadcastManager.getInstance(mContext).registerReceiver(mRandomCharReceiver, new IntentFilter("BROADCAST_RANDOM_CHARACTER"));
// Change the action bar color
getSupportActionBar().setBackgroundDrawable(new ColorDrawable(Color.parseColor("#FFFF00BF")));
// Set a click listener for start button
btnStart.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View view)
{
isServiceOn = true;
serviceIntent = new Intent(getApplicationContext(), RandomCharacterService.class);
startService(serviceIntent);
setRandomNumber();
// Generate a random char
myRandomCharacter = new Random().nextInt(x)+m;
// Initialize a new intent instance
Intent intent = new Intent("BROADCAST_RANDOM_CHARACTER");
// Put the random character to intent to broadcast it
intent.putExtra("RandomCharacter",myRandomCharacter);
// Send the broadcast
LocalBroadcastManager.getInstance(mContext).sendBroadcast(intent);
// Update the TextView with random character
myTV.setText(" " + myRandomCharacter );
}
});
btnStop.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View view)
{
isServiceOn = false;
stopService(serviceIntent);
}
});
}
private void setRandomNumber()
{
myTV.setText("Random Character: " + (char)myService.getRandomCharacter());
String alphabet = myTV.getText().toString();
}
}
RandomCharacterService.java:
package com.example.cs7455rehmarazzaklab8;
import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
import android.support.annotation.IntDef;
import android.support.annotation.Nullable;
import android.util.Log;
import java.util.Random;
public class RandomCharacterService extends Service
{
private int myRandomCharacter;
char MyRandomCharacter = (char)myRandomCharacter;
private boolean isRandomGeneratorOn;
private final int MIN = 65;
char m = (char)MIN;
private final int MAX = 26;
char x = (char)MAX;
private final String TAG = "Random Char Service: ";
private final String alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
class RandomCharacterServiceBinder extends Binder{
public RandomCharacterService getService()
{
return RandomCharacterService.this;
}
}
private IBinder myBinder = new RandomCharacterServiceBinder();
#Override
public int onStartCommand(Intent intent, int flags, int startId)
{
Log.i(TAG, "In OnStartCommand Thread ID is "+Thread.currentThread().getId());
isRandomGeneratorOn = true;
new Thread(new Runnable()
{
#Override
public void run()
{
startRandomGenerator();
}
}
).start();
return START_STICKY;
}
private void startRandomGenerator()
{
while(isRandomGeneratorOn)
{
char alphabet = 'A';
for (int i = 65; i < 90; i++)
{
try
{
Thread.sleep(1000);
if(isRandomGeneratorOn)
{
alphabet++;
myRandomCharacter = new Random().nextInt(x)+m;
Log.i(TAG, "Thread ID is "+Thread.currentThread().getId() + ", Random character is "+(char)myRandomCharacter);
}
}
catch(InterruptedException e)
{
Log.i(TAG, "Thread Interrupted.");
}
}
}
}
private void stopRandomGenerator()
{
isRandomGeneratorOn = false;
}
public int getRandomCharacter()
{
return myRandomCharacter;
}
public boolean isRandomGeneratorOn() {
return isRandomGeneratorOn;
}
#Override
public void onDestroy()
{
super.onDestroy();
stopRandomGenerator();
Log.i(TAG, "Service Destroyed.");
}
#Nullable
#Override
public IBinder onBind(Intent intent)
{
Log.i(TAG, "In onBind ...");
return myBinder;
}
}
Call Stack:callstack from running the app
Call Stack from attempting to press the stop button:crash from attempting to press stop button

Since you are using the bound service (using Ibinder). You will have to start the service by calling bindService instead of startService. But before that you need to initialize your ServiceConnection variable and better use the isServiceOn boolean as in the below example.
private ServiceConnection myServiceConnection = new ServiceConnection() {
#Override
// IBinder interface is through which we receive the service object for communication.
public void onServiceConnected(ComponentName name, IBinder binder) {
RandomCharacterServiceBinder myBinder = (RandomCharacterServiceBinder) binder;
isServiceOn = true;
myService = myBinder.getService();
Toast.makeText(context,"Service connected", Toast.LENGTH_SHORT).show();
}
#Override
public void onServiceDisconnected(ComponentName name) {
isServiceOn = false;
myService = null;
}
};
After onServiceConnected is called, you will get your service object. Most probably your service will be initialized before you perform a click. But just to ensure you can TOAST some message within it.
And you should start the service in Activity's onCreate method, so service will get some time in creation. So move the below code from you click listener to onCreate method.
serviceIntent = new Intent(getApplicationContext(), RandomCharacterService.class);
// startService(serviceIntent); <-- remove this line, call bindService
bindService(intent, myServiceConnection, Context.BIND_AUTO_CREATE);
and wait for the service connection Toast to appear.

Related

How do I end a repeating handler when it hits a certain condition?

I'm making an application that plays audio files off the device's storage, and I have a seek bar that checks the progress of the audio file (how long it has played) every second, and updates the seekbar accordingly.
The audio is played through a service that runs in the foreground, and also displays a notification that the audio is playing.
When the audio ends, I noticed the handler still goes in it's cycle, and I want to end the handler once the audio is done.
What I'm currently trying to do is to end the handler from inside the runnable that the handler runs, as I'm not sure how else I can end it.
Main Activity, where I handle OnClick from the ListView where you can select an audio file and also handles the seekbar update.
import androidx.appcompat.app.AppCompatActivity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.database.Cursor;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.SeekBar;
import android.widget.SimpleCursorAdapter;
import android.widget.TextView;
import java.util.concurrent.TimeUnit;
public class MainActivity extends AppCompatActivity {
SeekBar musicProgBar;
Handler progBarHandler = null;
Runnable r = null;
private MP3Service.MyBinder myService = null;
TextView progressText = null;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
musicProgBar = findViewById(R.id.musicProgressBar);
progressText = findViewById(R.id.progressText);
final ListView lv = (ListView) findViewById(R.id.musicList);
Cursor cursor = getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
null,
MediaStore.Audio.Media.IS_MUSIC + "!= 0",
null,
null);
progBarHandler = new Handler();
final int progBarDelay = 1000; // delay for the handler, making it repeat itself only every 1000 miliseconds (1 second)
lv.setAdapter(new SimpleCursorAdapter(this,
android.R.layout.simple_list_item_1,
cursor,
new String[] { MediaStore.Audio.Media.DATA},
new int[] { android.R.id.text1 }));
Intent tempIntent = new Intent(this, MP3Service.class);
startService(tempIntent);
bindService(tempIntent, serviceConnection, 0);
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> myAdapter,
View myView,
int myItemInt,
long myLong) {
Cursor c = (Cursor) lv.getItemAtPosition(myItemInt);
String uri = c.getString(c.getColumnIndex(MediaStore.Audio.Media.DATA));
Log.d("g53mdp", uri);
if (myService.fetchPlayerState() != MP3Player.MP3PlayerState.STOPPED)
myService.stopMusic();
myService.loadMusic(uri);
myService.playMusic();
musicProgBar.setMax(myService.fetchDuration()); // set the max value of the seekbar to be the duration of the song
r = new Runnable()
{
#Override
public void run()
{
int tempInt = myService.fetchProgress();
Log.d("progress ticking", tempInt + " " + musicProgBar.getProgress());
musicProgBar.setProgress(tempInt); // sets the current progress of the seekbar to be the progress of the song
long minutes = TimeUnit.MILLISECONDS.toMinutes(tempInt);
long seconds = TimeUnit.MILLISECONDS.toSeconds(tempInt);
if (seconds >= 60)
seconds = seconds - 60;
String tempString = minutes + ":" + seconds;
progressText.setText(tempString);
progBarHandler.postDelayed(this, progBarDelay);
if (musicProgBar.getProgress() == myService.fetchDuration())
progBarHandler.removeCallbacks(this);
}
};
progBarHandler.post(r);
}});
}
private ServiceConnection serviceConnection = new ServiceConnection()
{
#Override
public void onServiceConnected(ComponentName name, IBinder service)
{
myService = (MP3Service.MyBinder) service;
}
#Override
public void onServiceDisconnected(ComponentName name)
{
myService = null;
}
};
public void playButClicked(View view)
{
myService.playMusic();
}
public void pauseButClicked(View view)
{
myService.pauseMusic();
}
public void stopButClicked(View view)
{
myService.stopMusic();
}
#Override
protected void onDestroy()
{
unbindService(serviceConnection);
progBarHandler.removeCallbacks(r);
super.onDestroy();
}
}
What is strange is that in onDestroy(), I do use removeCallbacks to end the handler, and that works nicely. I know that it comes to the point where it calls for removeCallbacks in the Runnable r, confirmed through debugging and logging. Also tried implementing a method that is specifically for removing the handler and calling that, no luck. Also tried using return.
The part I'm struggling with is
r = new Runnable()
{
#Override
public void run()
{
int tempInt = myService.fetchProgress();
Log.d("progress ticking", tempInt + " " + musicProgBar.getProgress());
musicProgBar.setProgress(tempInt); // sets the current progress of the seekbar to be the progress of the song
long minutes = TimeUnit.MILLISECONDS.toMinutes(tempInt);
long seconds = TimeUnit.MILLISECONDS.toSeconds(tempInt);
if (seconds >= 60)
seconds = seconds % 60;
String tempString = minutes + ":" + seconds;
progressText.setText(tempString);
progBarHandler.postDelayed(this, progBarDelay);
if (musicProgBar.getProgress() == myService.fetchDuration())
progBarHandler.removeCallbacks(this);
}
};
progBarHandler.post(r);
}});
The service which handles the music player and handles playing the music
import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.Build;
import android.os.Handler;
import android.os.IBinder;
import android.util.Log;
import androidx.annotation.Nullable;
import androidx.core.app.NotificationCompat;
public class MP3Service extends Service
{
public static MP3Service instance = null; // implementing singleton by instantiating a reference to the instance
private final String SERVICE_ID = "100"; // id for the service
public static boolean isRunning = false; //
NotificationManager notificationManager = null;
int notificationID = 001;
private final IBinder binder = new MyBinder();
MP3Player mainPlayer;
#Nullable
#Override
public IBinder onBind(Intent intent)
{
return binder;
}
#Override
public void onRebind(Intent intent)
{
// TODO: implement Rebind for screen orientation change
}
#Override
public void onCreate()
{
instance = this;
isRunning = true;
notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
mainPlayer = new MP3Player();
super.onCreate();
Handler handler = new Handler();
}
#Override
public void onDestroy()
{
isRunning = false;
instance = null;
notificationManager.cancel(notificationID);
}
public void createNotification()
{
CharSequence name = "MP3 Notification";
String description = "Displays a notification when a song is playing";
int importance = NotificationManager.IMPORTANCE_DEFAULT;
NotificationChannel channel = new NotificationChannel(SERVICE_ID, name, importance);
channel.setDescription(description);
notificationManager.createNotificationChannel(channel);
Intent intent = new Intent(this, MainActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
// when the user clicks the notification, this will bring them to the activity
PendingIntent navToMainActivity = PendingIntent.getActivity(this, 0, intent, 0);
// sets up the info and details for the notification
final NotificationCompat.Builder mNotification = new NotificationCompat.Builder(this, SERVICE_ID)
.setSmallIcon(R.drawable.ic_launcher_background)
.setContentTitle("MP3 Player")
.setContentText("Playing music")
.setContentIntent(navToMainActivity)
.setPriority(NotificationCompat.PRIORITY_DEFAULT);
startForeground(notificationID, mNotification.build());
}
public void removeNotification()
{
stopForeground(false);
notificationManager.cancelAll();
}
public class MyBinder extends Binder
{
public void loadMusic(String filePath)
{
mainPlayer.load(filePath);
}
public void playMusic()
{
mainPlayer.play();
createNotification();
}
public void pauseMusic()
{
mainPlayer.pause();
removeNotification();
}
public void stopMusic()
{
mainPlayer.stop();
removeNotification();
}
public MP3Player.MP3PlayerState fetchPlayerState()
{
return mainPlayer.getState();
}
public int fetchDuration()
{
return mainPlayer.getDuration();
}
public int fetchProgress()
{
return mainPlayer.getProgress();
}
}
}
Thanks in advance for any help, and I am happy to provide with more information if required
EDIT: changed the progBarHandler.postDelay() that is outside the runnable to a simple progBarHandler.post()

I think the only reason you failed to stop the handler is constantly invoking progBarHandler.postDelayed(this, progBarDelay);,you need to check why it's still running.

Managed to get it working by introducing a different kind of if statement to the runnable, like so
Runnable r = new Runnable()
{
#Override
public void run()
{
if (musicProgBar.getProgress() == myService.fetchProgress() && myService.fetchProgress() != 0)
Log.d("audio", "over");
else {
int tempInt = myService.fetchProgress();
long minutes = TimeUnit.MILLISECONDS.toMinutes(tempInt);
long seconds = TimeUnit.MILLISECONDS.toSeconds(tempInt);
if (seconds >= 60)
seconds = seconds % 60;
String tempString = minutes + ":" + seconds;
progressText.setText(tempString);
musicProgBar.setProgress(tempInt); // sets the current progress of the seekbar to be the progress of the song
progBarHandler.postDelayed(this, progBarDelay);
}
}
};
It seemed for some reason, using .fetchDuration() and .fetchProgress() will never equalize each other, so changing the if statement worked.

I have want to getinent outside the oncreate() activity to extract my YouTube link in exoplayer from another class

From my recyclerview adapter class through intent put extra I am passing the URL of the video and I want to getintent outside the oncreate() activity.to pass the URL in another string which is outside my oncreate(). is there is any possibility to access getintent string outside the oncreate?
in this class I want to getintent of video URL before the ONCREATE() to pass the URL instead of static URL;
package com.example.movies.uis;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.annotation.SuppressLint;
import android.content.pm.ActivityInfo;
import android.content.res.Configuration;
import android.os.Bundle;
import android.util.Log;
import android.util.SparseArray;
import android.view.View;
import android.view.WindowManager;
import android.widget.ImageButton;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import com.example.movies.R;
import com.google.android.exoplayer2.ui.AspectRatioFrameLayout;
import com.google.android.exoplayer2.ui.SimpleExoPlayerView;
import at.huber.youtubeExtractor.Format;
import at.huber.youtubeExtractor.VideoMeta;
import at.huber.youtubeExtractor.YouTubeExtractor;
import at.huber.youtubeExtractor.YtFile;
public class PlayerActivity extends AppCompatActivity {
SimpleExoPlayerView simpleExoPlayerView;
private String GRID_YOUTUBE_ID = "s9-Id1WJQyo";
private String BASE_URL = "https://www.youtube.com";
private String youtubeLink = BASE_URL + "/watch?v=" + GRID_YOUTUBE_ID;
//hello
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_player);
extractYoutubeUrl();
simpleExoPlayerView = findViewById(R.id.player);
String title = getIntent().getExtras().getString("title");
String urlYoutube = getIntent().getExtras().getString("videourl");
TextView tv_name = findViewById(R.id.txt_title);
tv_name.setText(title);
}
#SuppressLint("StaticFieldLeak")
private void extractYoutubeUrl() {
new YouTubeExtractor(this) {
#Override
public void onExtractionComplete(SparseArray<YtFile> sparseArray, VideoMeta vMeta) {
//Log.d("======>>>>>>>>>>>>>>>>>", "onExtractionComplete: "+ytFiles.toString());
if (sparseArray != null) {
for(int i=0, size = sparseArray.size(); i < size; i++){
YtFile ytFile = sparseArray.valueAt(i);
Format frmt = ytFile.getFormat();
if(frmt.getExt() == "mp4" || frmt.getExt() == "webm"){
// Log.d(">>>>>>>>>>>>>>>>>>>>>>", "index: " + i+ " path: "+ytFile);
}
playVideo(ytFile.getUrl());
}
}
}
}.extract(youtubeLink, true, true);
}
public void playVideo(String downloadUrl) {
simpleExoPlayerView.setPlayer(ExoPlayerCustomise.getSharedInstance(PlayerActivity.this).getSimpleExoPlayerView().getPlayer());
ExoPlayerCustomise.getSharedInstance(PlayerActivity.this).playStream(downloadUrl);
}
}
and here is my adapter class code which is passing the URL to the activity
onclick item
public void onBindViewHolder(RecyclerviewAdpaterFragment70s.RecyclerViewHolder holder, int position) {
Context context = holder.cardthumnail.getContext();
Songsapis songs = songsapis.get(position);
holder.cardtitle.setText(songs.getTitle());
Picasso.with(context)
.load(songs.getThumbnail())
.into(holder.cardthumnail);
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Context context = holder.itemView.getContext();
Intent i = new Intent(context, PlayerActivity.class);
i.putExtra("title",songsapis.get(position).getTitle());
i.putExtra("videourl",songsapis.get(position).getUrl());
context.startActivity(i);
}
});
}

You can use deeplink with specific structure
Append blew line manifest
Define ACTION_VIEW intent action so that the intent filter can be reached from Google Search
<action android:name="android.intent.action.VIEW" />
And add BROWSABLE category in order to be accessible from a out off app
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.BROWSABLE" />
Add your link structure
<data android:host="youtube" android:pathPattern=".*" android:scheme="https"/>
Get data with intent
Intent intent = getIntent();
Uri data = intent.getData();
Send data to app
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("https://youtube"));
startActivity(launchIntent);

You need to make String title and urlYoutube global( i.e. outside onCreate). and then Initialize both inside onCreate by this way you can use intent data outside onCreate method
for example
public class PlayerActivity extends AppCompatActivity {
SimpleExoPlayerView simpleExoPlayerView;
private String GRID_YOUTUBE_ID = "s9-Id1WJQyo";
private String BASE_URL = "https://www.youtube.com";
private String youtubeLink = BASE_URL + "/watch?v=" + GRID_YOUTUBE_ID;
public String title,urlYoutube;
//hello
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_player);
extractYoutubeUrl();
simpleExoPlayerView = findViewById(R.id.player);
title = getIntent().getExtras().getString("title");
urlYoutube = getIntent().getExtras().getString("videourl");
}
I hope this solves your problem.

Trying to process different scenarios in Service

I am having a problem and I ran out of ideas how to fix it.
The goal is, when the user clicks the button an URL is loaded depending on what's selected in settings.
Problem is, I am having trouble setting it up in a right way.
Logically(to me), I tried to set it up in a service. Button is clicked > Service starts > URL is loaded from "IF ELSE".
Problem is, I get an error in "IF ELSE" - "Method length must be called from the UI Thread, currently inferred thread is is worker.
public static class Service extends IntentService {
public Service() {
super("wallpaperchanger-download");
}
#Override
protected void onHandleIntent(Intent intent) {
MainActivity mainActivity;
mainActivity = new MainActivity();
if (mainActivity.mEditTextHashtag.length() > 2) {
WallpaperManager wm = WallpaperManager.getInstance(this);
int height = wm.getDesiredMinimumHeight();
int width = wm.getDesiredMinimumWidth();
String url = "https://source.unsplash.com/all/?" + mainActivity.mEditTextHashtag.getText() + "/" + width + "x" + height + "/";
try {
InputStream input = new URL(url).openStream();
Log.v(TAG, url);
wm.setStream(input);
input.close();
} catch (Exception e) {
e.printStackTrace();
}
loading = false;
}
}
}
Ok, fair enough.
I created new Method getPhoto(); in UI Thread and put the code in there. Then, I called mainActivity.getPhoto(); in Service.
Problem is, I get an error - "Attempt to invoke virtual method 'int android.widget.EditText.length()' on a null object reference"
Any ideas on what I should do?
Full code in all its glory:
package com.edip.splashwallpaper;
import android.app.AlarmManager;
import android.app.IntentService;
import android.app.PendingIntent;
import android.app.WallpaperManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.Switch;
import android.widget.Toast;
import java.io.InputStream;
import java.net.URL;
public class MainActivity extends android.app.Activity {
final static String TAG = "AllInOne";
final static int CHANGE_INTERVAL = 30 * 1000; //30 sec for testing
static boolean loading = false;
WallpaperManager wm;
//Layout Views
Switch mSwitchFixedPhoto, mSwitchControls, mSwitchSave, mSwitchPause;
Spinner mSpinnerCategories, mSpinnerInterval;
EditText mEditTextHashtag;
Button mWallpaperButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Layout Views Initialized
mSwitchFixedPhoto = (Switch) findViewById(R.id.sw_fixedphoto);
mSwitchControls = (Switch) findViewById(R.id.switch_controls);
mSwitchSave = (Switch) findViewById(R.id.switch_save);
mSwitchPause = (Switch) findViewById(R.id.switch_pause);
mSpinnerCategories = (Spinner) findViewById(R.id.spinner_categories);
mSpinnerInterval = (Spinner) findViewById(R.id.spinner_interval);
mEditTextHashtag = (EditText) findViewById(R.id.et_hashtag);
mWallpaperButton = (Button) findViewById(R.id.btn_set_wallpaper);
// Create an ArrayAdapter using the string array and a default spinner layout
ArrayAdapter<CharSequence> adapterCategory = ArrayAdapter.createFromResource(this,
R.array.categories_array, R.layout.dialog_spinner_layout);
// Specify the layout to use when the list of choices appears
adapterCategory.setDropDownViewResource(R.layout.dialog_spinner_layout);
// Apply the adapter to the spinner
mSpinnerCategories.setAdapter(adapterCategory);
ArrayAdapter<CharSequence> adapterInterval = ArrayAdapter.createFromResource(this,
R.array.interval_array, R.layout.dialog_spinner_layout);
adapterInterval.setDropDownViewResource(R.layout.dialog_spinner_layout);
mSpinnerInterval.setAdapter(adapterInterval);
mWallpaperButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
PendingIntent pending = PendingIntent.getBroadcast(MainActivity.this,
666, new Intent("com.edip.splashwallpaper.CHANGE_WALLPAPTER_TIMER"),
PendingIntent.FLAG_CANCEL_CURRENT);
((AlarmManager) getSystemService(Context.ALARM_SERVICE))
.setRepeating(AlarmManager.RTC, System.currentTimeMillis(),
CHANGE_INTERVAL, pending);
}
});
}
public void getPhoto() {
if (mEditTextHashtag.length() > 2) {
wm = WallpaperManager.getInstance(this);
int height = wm.getDesiredMinimumHeight();
int width = wm.getDesiredMinimumWidth();
String url = "https://source.unsplash.com/all/?" + mEditTextHashtag.getText() + "/" + width + "x" + height + "/";
try {
InputStream input = new URL(url).openStream();
Log.v(TAG, url);
wm.setStream(input);
input.close();
} catch (Exception e) {
e.printStackTrace();
}
loading = false;
} else {
Toast.makeText(this, "Something else", Toast.LENGTH_SHORT).show();
}
}
public static class Service extends IntentService {
public Service() {
super("wallpaperchanger-download");
}
#Override
protected void onHandleIntent(Intent intent) {
MainActivity mainActivity;
mainActivity = new MainActivity();
mainActivity.getPhoto();
}
}
public static class AlarmReceiver extends BroadcastReceiver {
#Override
public void onReceive(final Context context, Intent intent) {
if (!loading) {
loading = true;
context.startService(new Intent(context, Service.class));
}
}
}
}
Thanks :)

First of all, you should never instantiate an activity by yourself.
Second, as a best practice, your service shouldn't know about your activity, or that it has an edit text. Instead you should send the URL to load inside your intent, when the PendingIntent is created, like this :
Intent intent = new Intent("com.edip.splashwallpaper.CHANGE_WALLPAPTER_TIMER");
intent.putExtra("USER_URL", "https://source.unsplash.com/all/?" + mEditTextHashtag.getText() + "/" + width + "x" + height + "/");
PendingIntent pending = PendingIntent.getBroadcast(MainActivity.this,
666, intent, PendingIntent.FLAG_CANCEL_CURRENT);
Then within your service, read the url like so :
#Override
protected void onHandleIntent(Intent intent) {
String url = intent.getStringExtra("USER_URL");
// ...
}

Android Starting Activity via Background Service

My goal is to have UDP packets receiving app continuously running from boot up in the back ground when ever it receives the valid packet it has to process the message and display them.
After some research, I did the following.
Broadcast Receiver class - which start the service on boot UP (mstart.java).
Service Class to monitor for UDP packets (udp.java).
Display Class to display the messages as text (Rmsgs.java).
GlobalState.Java for Global variable.
I wrote a standalone with UDP app with list view it works fine. Hence, I know there is no problem on that.
When I compiled ran the code service start on boot and then crashes. To debug I have taken away the UDP Packet receiving part. The UDP class after receiving the packets it will produce two arrays list and will save it in the Global class and the Display class will obtain it.
This code is working now, I found mistake I have made and corrected it.
Now I have to modify to receive the udp packets.
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<uses-permission android:name="android.permission.WAKE_LOCK"/>
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.QUICKBOOT_POWERON"/>
<application
android:name="com.mmm.rmsg.GlobalState"
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:largeHeap="true"
android:theme="#style/AppTheme" >
<activity
android:name=".MsgView"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:enabled="true" android:exported="true"
android:name=".mstart"
android:permission="android.permission.RECEIVE_BOOT_COMPLETED">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED"/>
<action android:name="android.intent.action.QUICKBOOT_POWERON"/>
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</receiver>
<service android:name=".udp"
/>
</application>
<uses-permission android:name="android.permission.INTERNET"/>
Broadcast Receiver Class
package com.mmm.rmsg;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;
public class mstart extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context, "Intent detcted.", Toast.LENGTH_LONG).show();
Intent pushIntent = new Intent(context, udp.class);
context.startService(pushIntent);
}
}
Service Class
package com.mmm.rmsg;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.os.IBinder;
import android.os.PowerManager;
import android.widget.Toast;
import java.util.ArrayList;
import static android.os.PowerManager.PARTIAL_WAKE_LOCK;
public class udp extends Service {
private static final String LOG_TAG =udp.class.getSimpleName();
GlobalState gs = (GlobalState)getApplication();
#Override
public IBinder onBind(Intent arg0){
return null;
}
#Override public int onStartCommand(Intent intent, int flags, int startId) {
setWakeLock();
Toast.makeText(this, "Service Started", Toast.LENGTH_LONG).show();
new Thread(new Server()).start();
return START_STICKY;
}
private void setWakeLock(){
PowerManager.WakeLock mWakeLock;
PowerManager powerManager = (PowerManager)getSystemService(Context.POWER_SERVICE);
mWakeLock=powerManager.newWakeLock(PARTIAL_WAKE_LOCK, LOG_TAG);
}
public class Server implements Runnable {
#Override
public void run() {
ArrayList<String> list = new ArrayList<>();
ArrayList<String> clist = new ArrayList<>();
// here udp packets are recvd & processed into 2 list arrays
list.add(0, "MAIN FAIL");
list.add(1,"BOILER HEATER 20C");
list.add(2, "COOLING NEED ATT");
clist.add(0, "6");
clist.add(1,"1");
clist.add(2, "5");
GlobalState gs = (GlobalState)getApplication();
gs.setGmlist(list);
gs.setGclist(clist);
call();
}
}
public void call() {
Intent dialogIntent = new Intent(getBaseContext(), MsgView.class);
dialogIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(dialogIntent);
}
}
Global Class
package com.mmm.rmsg;
import java.util.ArrayList;
import android.app.Application;
public class GlobalState extends Application
{
private ArrayList<String> Gmlist = new ArrayList<>();
private ArrayList<String> Gclist = new ArrayList<>();
private boolean chk = true;
private boolean cchk = true;
public ArrayList<String> getGmlist() {
chk = Gmlist.isEmpty();
if(chk==true)
{
Gmlist.add(0,"No Calls");
}
return Gmlist;
}
public ArrayList<String> getGclist() {
cchk = Gclist.isEmpty();
if(cchk==true)
{
Gclist.add(0,"0");
}
return Gclist;
}
public void setGmlist(ArrayList<String> Gmlit) {
for (int i = 0; i < Gmlit.size(); i++) {
this.Gmlist.add(i, Gmlit.get(i));
}
}
public void setGclist(ArrayList<String> Gclit) {
for (int i = 0; i < Gclit.size(); i++) {
this.Gmlist.add(i, Gclit.get(i));
}
}
}
Display Class
package com.mmm.rmsg;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ListView;
import android.content.Context;
import android.graphics.Color;
import android.widget.ArrayAdapter;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.Arrays;
public class MsgView extends AppCompatActivity {
ListView listView ;
ArrayList<String> mlist = new ArrayList<>();
ArrayList<String> plist = new ArrayList<>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_msg_view);
// Get ListView object from xml
listView = (ListView) findViewById(R.id.list);
GlobalState gs = (GlobalState) getApplication();
mlist= gs.getGmlist();
plist= gs.getGclist();
String[] msgArray = mlist.toArray(new String[mlist.size()]);
Arrays.toString(msgArray);
String[] clrArray = plist.toArray(new String[plist.size()]);
Arrays.toString(clrArray);
listView.setAdapter(new ColorArrayAdapter(this, android.R.layout.simple_list_item_1, msgArray,clrArray));
}
public class ColorArrayAdapter extends ArrayAdapter<Object>{
private String[] list;
private String[] p;
public ColorArrayAdapter(Context context, int textViewResourceId,
Object[] objects, Object[] obj) {
super(context, textViewResourceId, objects);
list = new String[objects.length];
for (int i = 0; i < list.length; i++)
list[i] = (String) objects[i];
p = new String[objects.length];
for (int i = 0; i < p.length; i++)
p[i] = (String) obj[i];
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = (TextView)super.getView(position, convertView, parent);
String c;
for(int x=0; x< list.length; x++)
{
c=chk(x,p);
if("R".equals(c) && position==x ) {
view.setBackgroundColor(Color.RED);
}
else
if("Y".equals(c) && position==x) {
view.setBackgroundColor(Color.YELLOW);
}
else
if("G".equals(c) && position==x) {
view.setBackgroundColor(Color.GREEN);
}
}
return view;
}
}
public String chk(int idx, String[] table){
String res;
if("6".equals(table[idx]) || "7".equals(table[idx]) || "8".equals(table[idx])) {
res = "R";
}
else
if("4".equals(table[idx]) || "5".equals(table[idx])) {
res = "Y";
}
else
if("1".equals(table[idx])|| "2".equals(table[idx]) || "3".equals(table[idx]) ) {
res = "G";
}
else{
res = "W";
}
return res;
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_msg_view, 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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
protected void onDestroy(){
super.onDestroy();
}
}

You haven't started your thread. You can do it like this:
Thread initBkgThread = new Thread(new Runnable() {
public void run() {
udp();
}
});
initBkgThread .start();

Is this a full code or just some snips?
First thing is that your text1 is not initialized.
text1 = findViewById(R.id.<id_of_text_view_in_activity_calls_layout>) ?

To start an activity from your service you should create your intent like:
//Starting Smsgs
Intent startAct = new Intent(context, Smsgs.class);
startAct.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(startAct);
You need at least two thread for this, one for the receiving of the UDP packets and the other is to compute the data. You need to modify your udp() function like this:
//Warning, I did not test this code, handle it like pseude-code.
private void udp(){
// ...
// Wait to receive a datagram
dsocket.receive(packet);
Thread showMsg = new Thread(new Runnable() {
public void run() {
// Convert the contents to a string,
String message = new String(buffer, 0, packet.getLength());
Intent intent = new Intent(this, Smsgs.class);
intent.putExtra("msg",message);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}
});
showMsg.start();
// ...
}
and also don't forget to start your another thread: initBkgThread.start()
hope it helps.

Android Wear Message Api Not Working

Android Wear Java I'm having some trouble finding out how to implement the Wear to Phone call using the Message Api. Can someone give me a simple working example or help me out here?
This is my code for testing...
Wear MainJava
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.support.v4.content.LocalBroadcastManager;
import android.support.wearable.view.WatchViewStub;
import android.util.Log;
import android.widget.TextView;
public class MessageActivity extends Activity {
private TextView mTextView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_message);
final WatchViewStub stub = (WatchViewStub) findViewById(R.id.watch_view_stub);
stub.setOnLayoutInflatedListener(new WatchViewStub.OnLayoutInflatedListener() {
#Override
public void onLayoutInflated(WatchViewStub stub) {
mTextView = (TextView) stub.findViewById(R.id.text);
}
});
// Register the local broadcast receiver
IntentFilter messageFilter = new IntentFilter(Intent.ACTION_SEND);
MessageReceiver messageReceiver = new MessageReceiver();
LocalBroadcastManager.getInstance(this).registerReceiver(messageReceiver, messageFilter);
}
public class MessageReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
String message = intent.getStringExtra("message");
Log.v("myTag", "Main activity received message: " + message);
// Display message in UI
mTextView.setText(message);
}
}
}
Wear Listener Service
import android.content.Intent;
import android.support.v4.content.LocalBroadcastManager;
import android.util.Log;
import com.google.android.gms.wearable.MessageEvent;
import com.google.android.gms.wearable.WearableListenerService;
public class ListenerService extends WearableListenerService{
#Override
public void onMessageReceived(MessageEvent messageEvent) {
if (messageEvent.getPath().equals("/message_path")) {
final String message = new String(messageEvent.getData());
Log.v("myTag", "Message path received on watch is: " + messageEvent.getPath());
Log.v("myTag", "Message received on watch is: " + message);
// Broadcast message to wearable activity for display
Intent messageIntent = new Intent();
messageIntent.setAction(Intent.ACTION_SEND);
messageIntent.putExtra("message", message);
LocalBroadcastManager.getInstance(this).sendBroadcast(messageIntent);
}
else {
super.onMessageReceived(messageEvent);
}
}
}
and the mobile(phone)
package com.spokengiovannie.messageactivity;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.wearable.MessageApi;
import com.google.android.gms.wearable.Node;
import com.google.android.gms.wearable.NodeApi;
import com.google.android.gms.wearable.Wearable;
public class MessageActivity extends ActionBarActivity
implements
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener {
GoogleApiClient googleClient;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_message);
// Build a new GoogleApiClient that includes the Wearable API
googleClient = new GoogleApiClient.Builder(this)
.addApi(Wearable.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
}
// Connect to the data layer when the Activity starts
#Override
protected void onStart() {
super.onStart();
googleClient.connect();
}
// Send a message when the data layer connection is successful.
#Override
public void onConnected(Bundle connectionHint) {
String message = "Hello wearable\n Via the data layer";
//Requires a new thread to avoid blocking the UI
new SendToDataLayerThread("/message_path", message).start();
}
// Disconnect from the data layer when the Activity stops
#Override
protected void onStop() {
if (null != googleClient && googleClient.isConnected()) {
googleClient.disconnect();
}
super.onStop();
}
// Placeholders for required connection callbacks
#Override
public void onConnectionSuspended(int cause) { }
#Override
public void onConnectionFailed(ConnectionResult connectionResult) { }
// Unused project wizard code
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_message, 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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
class SendToDataLayerThread extends Thread {
String path;
String message;
// Constructor to send a message to the data layer
SendToDataLayerThread(String p, String msg) {
path = p;
message = msg;
}
public void run() {
NodeApi.GetConnectedNodesResult nodes = Wearable.NodeApi.getConnectedNodes(googleClient).await();
for (Node node : nodes.getNodes()) {
MessageApi.SendMessageResult result = Wearable.MessageApi.sendMessage(googleClient, node.getId(), path, message.getBytes()).await();
if (result.getStatus().isSuccess()) {
Log.v("myTag", "Message: {" + message + "} sent to: " + node.getDisplayName());
} else {
// Log an error
Log.v("myTag", "ERROR: failed to send Message");
}
}
}
}
}
All this code is from a tutorial. When I launch de app on the phone it suppose to change the textView wear text. Someone have a sample or app already made for contact the phone I'm stuck :(.

I think the problem is LocalBroadcastManager.getInstance(this).sendBroadcast(messageIntent) in your WearableListenerService. This is a local broadcast which will not be delivered to the phone.
see API doc LocalBroadcastManager

I'm not sure if you figured it by now but for the fresh lads like me this might help.
Add listener service to the respective class, in this example this is the code.
Add this in your Wear's AndroidManifest.xml file.
<service android:name=".ListenerService">
<intent-filter>
<action android:name="com.google.android.gms.wearable.BIND_LISTENER" />
</intent-filter>
</service>

Develop Reference

Java is a programming language and computing platform first released by Sun Microsystems in 1995.

Generate Random Characters in Android Studio using Broadcast - java

Related

How do I end a repeating handler when it hits a certain condition?

I have want to getinent outside the oncreate() activity to extract my YouTube link in exoplayer from another class

Trying to process different scenarios in Service

Android Starting Activity via Background Service

Android Wear Message Api Not Working

Categories

Resources