telephonyManager.listen 强制应用程序终止

Question

我是 Android 新手，正在编写一个用于跟踪呼叫事件的小应用程序。每次我尝试绑定侦听器时，操作系统都会强制应用程序意外关闭。我错过了什么？这是我的代码：

包 com.example.helloandroid;

导入android.app.Activity； 导入android.content.Context； 导入android.os.Bundle； 导入android.telephony.CellLocation； 导入 android.telephony.PhoneStateListener； 导入android.telephony.ServiceState； 导入 android.telephony.TelephonyManager； 导入android.widget.TextView；

公共类 helloAndroid 扩展 Activity {

TextView 文本输出； 电话管理器电话管理器； PhoneStateListener phoneStateListener;

@覆盖 公共无效 onDestroy(){ telephonyManager.listen(phoneStateListener, PhoneStateListener.LISTEN_NONE);
}

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
 // Get the UI
    textOut = (TextView) findViewById(R.id.textOut);

 // Get the telephony manager
    telephonyManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);

    // Create a new PhoneStateListener
    phoneStateListener = new PhoneStateListener() {
     public void onCallForwardingIndicatorChanged(boolean cfi) {}
     public void onCallStateChanged(int state, String incomingNumber) {}
     public void onCellLocationChanged(CellLocation location) {}
     public void onDataActivity(int direction) {}
     public void onDataConnectionStateChanged(int state) {}
     public void onMessageWaitingIndicatorChanged(boolean mwi) {}
     public void onServiceStateChanged(ServiceState serviceState) {

      String stateString = "N/A";
         switch (serviceState.getState()) {
         case TelephonyManager.CALL_STATE_IDLE:
           stateString = "Idle";
           break;
         case TelephonyManager.CALL_STATE_OFFHOOK:
           stateString = "Off Hook";
           break;
         case TelephonyManager.CALL_STATE_RINGING:
           stateString = "Ringing";
           break;
         }
         textOut.append(String.format("\nonCallStateChanged: %s", stateString));

     }
     public void onSignalStrengthChanged(int asu) {}
     };

    // Register the listener with the telephony manager
    telephonyManager.listen(phoneStateListener,
       PhoneStateListener.LISTEN_CALL_FORWARDING_INDICATOR |
       PhoneStateListener.LISTEN_CALL_STATE |
       PhoneStateListener.LISTEN_CELL_LOCATION |
       PhoneStateListener.LISTEN_DATA_ACTIVITY |
       PhoneStateListener.LISTEN_DATA_CONNECTION_STATE |
       PhoneStateListener.LISTEN_MESSAGE_WAITING_INDICATOR |
       PhoneStateListener.LISTEN_SERVICE_STATE |
       PhoneStateListener.LISTEN_SIGNAL_STRENGTH); 

}

}

Answer 1

我的错误：需要添加权限 ACCESS_COARSE_LOCATION