短信弹出：AlertDialog不显示，因为我收到短信

Question

我看到很多应用程序做短信弹出窗口。为什么我无法使我的应用程序工作？如果有短信息，我希望它在屏幕上弹出。

这里是我的代码：

public class NotifySMSReceived extends Activity 
{ 

    private static final String LOG_TAG = "SMSReceiver"; 

    public static final int NOTIFICATION_ID_RECEIVED = 0x1221; 

    static final String ACTION = "android.provider.Telephony.SMS_RECEIVED"; 


    protected void onCreate(Bundle savedInstanceState) { 

     super.onCreate(savedInstanceState); 



     IntentFilter filter = new IntentFilter(ACTION); 

     this.registerReceiver(mReceivedSMSReceiver, filter); 

    } 


    private void displayAlert() 

    { 

     AlertDialog.Builder builder = new AlertDialog.Builder(this); 

     builder.setMessage("Are you sure you want to exit?").setCancelable(

       false).setPositiveButton("Yes", 
       new DialogInterface.OnClickListener() { 

        public void onClick(DialogInterface dialog, int id) { 
         dialog.cancel(); 
        } 
       }).setNegativeButton("No", 
       new DialogInterface.OnClickListener() { 
        public void onClick(DialogInterface dialog, int id) { 
         dialog.cancel(); 
        } 
       }); 
     AlertDialog alert = builder.create(); 
     alert.show(); 
    } 

    private final BroadcastReceiver mReceivedSMSReceiver = new BroadcastReceiver() { 
     @Override 
     public void onReceive(Context context, Intent intent) { 
      String action = intent.getAction(); 

      if (ACTION.equals(action)) 
      { 
       //your SMS processing code 
       displayAlert(); 
      } 
     } 
    };  
} 

Answer 1

我觉得这里的问题是与上下文对象。来自

的onReceive（上下文语境，意图意图）

你应该通过上下文onRecive收到喜欢 ..

私人无效displayAlert（上下文语境）

然后， 变化，

AlertDialog.Builder助洗剂=新AlertDialog.Builder（本）;

TO

AlertDialog.Builder助洗剂=新AlertDialog.Builder（上下文）;

现在它应该work.hope这有助于。

干杯。