Question

   import android.app.Activity;
   import android.content.Context;
   import android.os.Bundle;
   import android.telephony.PhoneStateListener;
   import android.telephony.TelephonyManager;
   import android.widget.TextView;

      public class TelephonyDemo extends Activity {
       TextView textOut;
     TelephonyManager telephonyManager;
      PhoneStateListener listener;

       /** 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
    listener = new PhoneStateListener() {
      @Override
      public void onCallStateChanged(int state, String incomingNumber) {
    String stateString = "N/A";
    switch (state) {
    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));
  }
};

// Register the listener with the telephony manager
telephonyManager.listen(listener, PhoneStateListener.LISTEN_CALL_STATE);

  }
  startService();

   }

如何让我的应用程序在后台运行？整个时间阅读手机状态？！？！？！？！

Answer 1

在当前的问题中无需“服务”。

即使您的Activiy（应用程序的可见/交互式部分）被隐藏/删除，您也可以使用BroadcastReceiver组件始终接收广播的意图PHONE_STATE_CHANGED。
这样你的应用程序每次PHONE STATE实际更改时都会做出反应。不需要“监听”机制。

在http://developer.android.com/reference/android/content/BroadcastReceiver.html

上查看有关BroadCastReceiver的更多信息

如何让Android应用程序在后台运行，服务示例？

1 个答案: