Intent.putExtra() 不更新其值

Question

I have 3 buttons in my home screen widget. After click i want to launch my activity with some parameter (it depends which button was clicked). The problem is that value is always 0 (it should be 0, 1 or 2, depends on which button was clicked). My code looks like this:

for (int appWidgetId : appWidgetIds) {
   RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.simple_app_widget); 

   for(int z=0;z<widget_buttons.length;z++) {
      int id = Integer.valueOf(widget_buttons[z]);
      if(z<accounts_array.length) {
          String[] data_array = accounts_array[z].split("\\,");

          Intent intent = new Intent(context, MainActivity.class).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
          Log.e(APP_TAG, "## ACCOUNT_ID: "+ data_array[0]);
          intent.putExtra("accountID", data_array[0]);
          PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
          views.setOnClickPendingIntent(id, pendingIntent);
          views.setTextViewText(id, data_array[1]);
       } else {
          views.setViewVisibility(id,View.INVISIBLE); //hide button
       }
    }

    appWidgetManager.updateAppWidget(appWidgetId, views);
}

First loop is for update every widget, second is for registering click event on 3 buttons.

This is how I retrive data in MainActivity.java

@Override
public void onCreate(Bundle savedInstanceState)
{
    // Log.e(APP_TAG, getExtra("accountID"));

    super.onCreate(savedInstanceState);

    Bundle extras = getIntent().getExtras();

    String accountParam = "";
    if (extras != null) {
        Log.e(APP_TAG, "AccountID in MainActivity: "+extras.getInt("accountID"));
        accountParam = "?accountID="+extras.getInt("accountID"); //<---
    }

    if (extras != null && extras.getBoolean("cdvStartInBackground", false)) {
        moveTaskToBack(true);
    }

    // Set by <content src="index.html" /> in config.xml
    loadUrl("file:///android_asset/www/index.html"+accountParam);
}

Can you please tell why every button after click gives 0 from extras.getInt()?

Answer 1

You pass in the account id as a String (because data is of type String[] ) but in the Activity you try to retrieve it from the extras Bundle with getInt() .

I set up a small sample app and found the following lines in Logcat:

01-21 18:24:02.525 4081-4081/com.example.todolist W/Bundle: Key accountID expected Integer but value was a java.lang.String. The default value 0 was returned.

01-21 18:24:02.525 4081-4081/com.example.todolist W/Bundle: Attempt to cast generated internal exception:

java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer at android.os.BaseBundle.getInt(BaseBundle.java:801) at android.os.BaseBundle.getInt(BaseBundle.java:783) at com.example.todolist.OtherActivity.onCreate(OtherActivity.java:24) at android.app.Activity.performCreate(Activity.java:6237)

So in cases like this, the app won't crash but you will also not be able to retrieve the correct value.

In order to fix your code, you should use getString("accountID") .

Another thing: your PendingIntent s all have the same request code (0). Because of this, they will be considered as "the same PendingIntent". You have to use different request codes or all three Button s will trigger the same behavior.