Question

我创建了一个用于Wi-Fi的brodcastReceiver，每件事情都运行良好，除了当我在应用程序午餐时，广播接收器开始直接扫描，我无法阻止它，即使我出去也一直在运行从申请。我试图从主要活动中控制广播接收器，但似乎有一个问题。有人可以查看我的代码，如果有可能，请告诉我可能是什么问题。

提前谢谢。

PS ：点击按钮时，祝酒词正在运行，但对brodcast接收器没有任何影响。

我在brodcastreceiver上午餐，是否会对这个问题产生影响？

                                  **EDIT**

这是我的MainActivity

    public class MainActivity extends Activity {
    int newRssi;
    List<String> listDebitDistance = new ArrayList<String>(); 
    WifiManager wifi;

    private final BroadcsatReceiverMnager broad = new BroadcsatReceiverMnager();
    ArrayList<int[]> listCursorReçue = new ArrayList<int[]>();
     IntentFilter rssiFilter = new          IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }




/**
 * This method enables the Broadcast receiver registered in the AndroidManifest file.
 * @param view
 */
    public void enableBroadcastReceiver(View view){
        switch (view.getId()){

        case R.id.button1 :

             super.registerReceiver(broad, new IntentFilter("android.intent.action.BOOT_COMPLETED"));

            this.registerReceiver(broad, rssiFilter);
            WifiManager wifiMan=(WifiManager)MainActivity.this.getSystemService(Context.WIFI_SERVICE);
            wifiMan.startScan();

          Toast.makeText(this, "Enabled broadcast receiver", Toast.LENGTH_SHORT).show();

            break; 
        }

        }
/**
* This method disables the Broadcast receiver registered in the AndroidManifest file.
* @param view
*/
public void disableBroadcastReceiver(View view){
    switch (view.getId()){

    case R.id.button2 :
        //this.unregisterReceiver(broad); //this gives the exception 
     unregisterReceiver(broad); //this methode gives the exception too
      Toast.makeText(this, "Disabled broadcst receiver", Toast.LENGTH_SHORT).show();


        break; 
    }

}

public void onPause() {

    super.onPause();
    this.unregisterReceiver(broad);
//S'il y a un appel l'app crash !!! a voir !!!!
}
/**
 * Broadcast receiver to update 
 */

public void onResume() {
    super.onResume();
   // BroadcsatReceiverMnager broad = new BroadcsatReceiverMnager();

    //Note: Not using RSSI_CHANGED_ACTION because it never calls me back.


    WifiManager wifiMan=(WifiManager)MainActivity.this.getSystemService(Context.WIFI_SERVICE);
    wifiMan.startScan();

}
}

这是我的BroadcsatReceiverMnager类

  public class BroadcsatReceiverMnager extends BroadcastReceiver {
    int newRssi;

     int rssi1 ;
   int rssi2;
   int rssi3 ;
   int rssiOp1=0  ;
    int rssiOp2 =0 ;
    int rssiOp3=0  ;
    WifiManager wifi;



    @Override
    public void onReceive(Context arg0, Intent arg1) {      
        Toast.makeText(arg0,"MyTag BroadcsatReceiverMnager "+ "onReceive", Toast.LENGTH_LONG).show();

        wifi = (WifiManager)arg0.getSystemService(Context.WIFI_SERVICE);

    if(arg1.getAction().equals(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION )){//
             List<ScanResult> results = wifi.getScanResults();
            Toast.makeText(arg0, "results"+results, Toast.LENGTH_SHORT).show();
            rssiOp1 =   results.get(0).level;
            rssiOp2 =   results.get(1).level;
            rssiOp3 =   results.get(2).level;

      }
     WifiManager wifiMan=(WifiManager)arg0.getSystemService(Context.WIFI_SERVICE);
      wifiMan.startScan();
      int newRssi = wifiMan.getConnectionInfo().getRssi();
      Toast.makeText(arg0, "BroadcsatReceiverMnager"+newRssi, Toast.LENGTH_SHORT).show();
}


}

Answer 1

如果您想控制接收者的注册和取消注册，请不要在您的清单中定义它。正如我在answer中所说的那样：

如果您在清单中注册接收器，接收器的处理程序将在每次通信事件发生时启动。例如：每当您有连接向您显示通知时，Facebook的信使就会被启动...或者当您连接建议更新时，其他应用程序被启动...换句话说，接收器始终是注册的。

在您的情况下，在您的活动中定义接收者，注册它并在同一活动中取消注册。

/**
 * the intent of communication with the Brodcast receiver
 */
IntentFilter intentFilter = new IntentFilter();



/**
 * the BroadcastReceiver 
 */
BroadcastReceiver yourBroadcastReceiver = new BroadcsatReceiverMnager ();

在onCreat()：

中

// set the action
intentFilter.addAction("SCAN_RESULTS_AVAILABLE_ACTION");

注册：

    registerReceiver(yourBroadcastReceiver , intentFilter);

取消注册：

unregisterReceiver(yourBroadcastReceiver);

所以，在你的听众中：

    /**
 * This method enables the Broadcast receiver registered in the AndroidManifest file.
 * @param view
 */
    public void enableBroadcastReceiver(View view){
        switch (view.getId()){

        case R.id.button1 :

           registerReceiver(yourBroadcastReceiver , intentFilter);

              Toast.makeText(this, "Enabled broadcast receiver", Toast.LENGTH_SHORT).show();

            break; 
        }

        }
/**
* This method disables the Broadcast receiver registered in the AndroidManifest file.
* @param view
*/
public void disableBroadcastReceiver(View view){
    switch (view.getId()){

    case R.id.button2 :

        unregisterReceiver(yourBroadcastReceiver);

          Toast.makeText(this, "Disabled broadcst receiver", Toast.LENGTH_SHORT).show();


        break; 
    }

}

评论中你最后一个问题的答案：

1 /你有扫描要做，以获得一些信息。

2 /您希望仅在您处于主要活动时，通过操作（通过意图过滤器）进行扫描。

===＆GT;您在此活动中使用接收器： - 在onResume（）中注册它并在onPause（）中注销它 - 在接收器的onReceive（）中进行扫描（以及你要对它将返回的数据做什么）。

3 /你想要管理什么时候激活接收器，什么时候需要它：接收器不仅取决于活动的生命周期： ===＆GT;然后你添加一个按钮来激活或禁用它（注册/取消注册）。

Android BroadcastReceiver：无法手动启动和停止BroadcastReceiver，它会自动启动

1 个答案: