Question

我想从两个按钮启动和停止广播接收器。我已经在两个按钮监听器中为此编写了代码。

代码如下： -

在startButton中，我编写了注册接收器的代码，如下所示

     startCallBtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

            startCallBtn.setVisibility(View.INVISIBLE);
            stopCallBtn.setVisibility(View.VISIBLE);


            //register call receiver.
            registerReceiver(callReceiver, new IntentFilter(
            "android.intent.action.CALL"));
           System.out.println("Registered Call Receiver Perfectly");
        }
    });

在停止按钮中，我已将停止接收器的呼叫写为

   stopCallBtn.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            stopCallBtn.setVisibility(View.INVISIBLE);
            startCallBtn.setVisibility(View.VISIBLE);
            stopService(new Intent(MainActivity.this, SpeakOut.class));
            FileOutputStream fos;

          //Unregister sms receivers
            unregisterReceiver(callReceiver);
            System.out.println("Unregistered Call Broadcast Receiver");
        }
    });

当新的通话正在接收时，听众仍然在呼叫

Answer 1

您可以针对enable和disable BroadcastReceiver试用此代码。我希望这会对您有所帮助..

public void enableBroadcastReceiver(View view)
{

    ComponentName receiver = new ComponentName(this, AlarmManagerBroadcastReceiver.class);
    PackageManager pm = this.getPackageManager();

    pm.setComponentEnabledSetting(receiver,
            PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
            PackageManager.DONT_KILL_APP);
    Toast.makeText(this, "Enabled broadcast receiver", Toast.LENGTH_SHORT).show();
   }
   /**
    * This method disables the Broadcast receiver registered in the AndroidManifest file.
    * @param view
    */
   public void disableBroadcastReceiver(View view){
    ComponentName receiver = new ComponentName(this, AlarmManagerBroadcastReceiver.class);
    PackageManager pm = this.getPackageManager();
        pm.setComponentEnabledSetting(receiver,
            PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
            PackageManager.DONT_KILL_APP);
    Toast.makeText(this, "Disabled broadcst receiver", Toast.LENGTH_SHORT).show();
   }

Answer 2

清单

中的

 <receiver android:name="your receiver name">

主要活动

BroadcastReceiver br = new BroadcastReceiver() {

        @Override
        public void onReceive(Context context, Intent intent) {
            Log.w("Check", "Inside On Receiver");
            Toast.makeText(getApplicationContext(), "received", Toast.LENGTH_SHORT).show();
        }
    };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        IntentFilter filter = new IntentFilter();
        filter.addAction(BROADCAST_ACTION);
        filter.addCategory(Intent.CATEGORY_DEFAULT);
        registerReceiver(br, filter);

    }

    @Override
    protected void onPause() {
        super.onPause();
        unregisterReceiver(br);
    }
}

Answer 3

确保您呼叫的unregisterReceiver() receiver对象已调用registerReceiver()。如果您在释放它之前为同一个接收器创建新对象，那么注册的旧接收器对象将不再被注册，因为您已经为其分配了新的内存块。

例如，执行此操作：

MyBroadcastReceiver receiver = new MyBroadCastReceiver();
registerReceiver(receiver);
unregisterReceiver(receiver);

receiver = new MyBraodCastReceiver();

启动和停止广播接收器

3 个答案: