Android意圖廣播

我想創建一個程序，在點擊按鈕30秒後調用一個活動。我有用戶pendingIntent和BroadcastReciever爲這個pupose，但沒有發生。我的代碼是：Android意圖廣播

package com.example.wrox; 

import java.util.Calendar; 

import android.app.Activity; 
import android.app.AlarmManager; 
import android.app.PendingIntent; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.Toast; 

public class AlarmManagerDemo extends Activity { 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     final Calendar cal= Calendar.getInstance(); 
     cal.add(Calendar.SECOND, 30); 
     Button btn= (Button) findViewById(R.id.btn); 
     Intent intent= new Intent(this,AlarmManagerDemo.class); 
     intent.putExtra("alarm_message", "Maza aa gaya"); 
     final PendingIntent sender= PendingIntent.getBroadcast(this, 192837, intent, PendingIntent.FLAG_UPDATE_CURRENT); 

     btn.setOnClickListener(new OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       Toast message= Toast.makeText(getApplicationContext(), "This is Starting", Toast.LENGTH_LONG); 
       message.show(); 
       AlarmManager am= (AlarmManager) getSystemService(ALARM_SERVICE); 
       am.set(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), sender); 

      } 
     }); 

    } 
}

此活動在按鈕點擊30秒後調用Broadcase接收器。代碼是：

package com.example.wrox; 

import android.content.BroadcastReceiver; 
import android.content.Context; 
import android.content.Intent; 
import android.os.Bundle; 
import android.widget.Toast; 

public class AlarmDemo extends BroadcastReceiver{ 
@Override 
public void onReceive(Context ctx, Intent intent) { 
    try{ 
    Bundle bundle= intent.getExtras(); 
    String msg= bundle.getString("alarm_message"); 
    Intent newIntent= new Intent(ctx, NewActivity.class); 
    newIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
    ctx.startActivity(newIntent); 
    } 
    catch(Exception e) 
    { 
     Toast message= Toast.makeText(ctx, "Error occured", Toast.LENGTH_LONG); 
     message.show(); 
    } 
} 
}

這BroadcastReciever呼籲在我所用Toast顯示一些靜態內容的活動。但按鈕點擊後沒有任何事情發生。請建議我，我在哪裏犯錯？沒有錯誤和異常生成...

來源

2011-04-18 Durga Dutt

這是一個很好的資源updating the UI from a Timer。

剛進入一個Handler或Runnable當您按下30秒的按鈕，然後睡在了BroadCastReciever

來源

2011-04-18 05:37:03

叫你定義AndroidManifest.xml的BroadcastReceiver？

來源

2011-04-18 12:52:06 Naresh

Android意圖廣播

回答

相關問題