Android Multiple Notifications and with multiple intents

问题:

I have a fairly simple app that takes the input from a user and then sets it as a notification. The user can create as many notifications as he/she likes. I want the user to click the notification and get taken to a new activity called ResultActivity. ResultActivity in turn reads in the putExtras from the notifications intent and shows it to the user. The code below allows me to do almost everything I wanted, except anytime a notification is pressed, I receive the putExtra of the last created notification.

Intent notificationIntent = new Intent(ctx, MainActivity.class); PendingIntent contentIntent = PendingIntent.getActivity(ctx, i,notificationIntent,PendingIntent.FLAG_CANCEL_CURRENT);  NotificationManager nm = (NotificationManager) ctx.getSystemService(Context.NOTIFICATION_SERVICE);  Resources res = ctx.getResources(); NotificationCompat.Builder builder = new NotificationCompat.Builder(ctx); builder.setContentIntent(contentIntent)     .setSmallIcon(R.drawable.ic_launcher)     .setLargeIcon(BitmapFactory.decodeResource(res,R.drawable.ic_launcher))     .setTicker("Remember to " + text.getText())     .setWhen(System.currentTimeMillis()).setAutoCancel(true)     .setContentTitle(text.getText());  // Creates an explicit intent for an Activity in your app Intent resultIntent = new Intent(this, ResultActivity.class); String pass = text.getText().toString();  resultIntent.putExtra("title", pass); resultIntent.putExtra("uid", i);  TaskStackBuilder stackBuilder = TaskStackBuilder.create(this); // Adds the back stack for the Intent (but not the Intent itself) stackBuilder.addParentStack(ResultActivity.class); // Adds the Intent that starts the Activity to the top of the stack stackBuilder.addNextIntent(resultIntent); PendingIntent resultPendingIntent = stackBuilder.getPendingIntent(0,PendingIntent.FLAG_UPDATE_CURRENT);  new Uri.Builder().scheme("data").appendQueryParameter("text", "my text").build(); builder.setContentIntent(resultPendingIntent);  Notification n = builder.build(); n.flags = Notification.FLAG_NO_CLEAR; nm.notify(i++, n); text.setText(null); 

1. Open the application

2. Type in "One"

3. Hit ok

4. Notification is sent

5. Open the application

6. Type in "Two"

7. Hit ok

8. Notification is sent

Now you have two notifications. One that says "One" and one that says "Two". If you click on the notification "Two" it takes you to a screen that says "Two". Perfect!

If you click on the notification "One" it takes you to a screen that says "Two". BROKEN!

ResultActivity.java

public class ResultActivity extends Activity {     String title = null;     TextView text;      int i=0;     @Override     protected void onCreate(Bundle savedInstanceState) {         // TODO Auto-generated method stub         super.onCreate(savedInstanceState);         setContentView(R.layout.activity);         text = (TextView) findViewById(R.id.textView1);            title = getIntent().getStringExtra("title");          i = getIntent().getIntExtra("uid", 0);           text.setText(title);      } 

回答1:

You create multiple intents that are mixed. I cleaned up the code (but did not test it)

    NotificationManager nm = (NotificationManager) ctx             .getSystemService(Context.NOTIFICATION_SERVICE);      Resources res = ctx.getResources();      // Creates an explicit intent for an Activity in your app     Intent resultIntent = new Intent(this, ResultActivity.class);     String pass = text.getText().toString();     resultIntent.setData(new Uri.Builder().scheme("data")             .appendQueryParameter("text", "my text").build());     resultIntent.putExtra("title", pass);     resultIntent.putExtra("uid", i);      TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);     // Adds the back stack for the Intent (but not the Intent itself)     stackBuilder.addParentStack(ResultActivity.class);     // Adds the Intent that starts the Activity to the top of the stack     stackBuilder.addNextIntent(resultIntent);     PendingIntent resultPendingIntent = stackBuilder.getPendingIntent(0,             PendingIntent.FLAG_UPDATE_CURRENT);      NotificationCompat.Builder builder = new NotificationCompat.Builder(ctx);     builder.setSmallIcon(R.drawable.ic_launcher)             .setLargeIcon(                     BitmapFactory.decodeResource(res,                             R.drawable.ic_launcher))             .setTicker("Remember to " + text.getText())             .setWhen(System.currentTimeMillis()).setAutoCancel(true)             .setContentTitle(text.getText())             .setContentIntent(resultPendingIntent);      Notification n = builder.build();     n.flags = Notification.FLAG_NO_CLEAR;     nm.notify(i++, n);      text.setText(null); 

回答2:

I know this was a lot time ago but i feel that the answers have not said anything about the problem in your code. So the problem is pretty much here PendingIntent resultPendingIntent = stackBuilder.getPendingIntent(0,PendingIntent.FLAG_UPDATE_CURRENT);

So you create a pendingIntent from the stackbuilder whith the flag of update_current. If you look at FLAG_UPDATE_CURRENT it says

 /**  * Flag indicating that if the described PendingIntent already exists,  * then keep it but replace its extra data with what is in this new  * Intent. For use with {@link #getActivity}, {@link #getBroadcast}, and  * {@link #getService}. <p>This can be used if you are creating intents where only the  * extras change, and don't care that any entities that received your  * previous PendingIntent will be able to launch it with your new  * extras even if they are not explicitly given to it.  */ public static final int FLAG_UPDATE_CURRENT = 1<<27; 

So what happens in your use case is that you create two identical pendingintents from the stackbuilder and the second intent overrides the first one . Actually you never create a second you just update the extras of the first one.

So unfortunately there is no available flag for your use case , but there is a good hack around it. What you can do is use the setAction of your resultIntent and place a random string or a string that makes sense to your app.

eg. resultIntent.setAction("dummy_action_" + notification.id);

This will make your resultIntent unique enough , so that the pendingIntent will create it rather than updating a previous one.

文章来源: Android Multiple Notifications and with multiple intents