Question

我有关于信号强度值的问题我想把信号强度值放在onCreate函数中但是它给了我零价值。但是当我在PhoneStateListener中测试它时，它给了我一个值这是7。任何的想法？这是我的代码。

package com.example.activitylifecycle;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.util.Log;
public class ActivitySignal extends Activity {
  private static final String TAG = "ActivitySignal";
  private int signalAsu = 0;
  PhoneStateListener signalListener=new PhoneStateListener()
  {
    public void onSignalStrengthChanged(int asu)
    {
      Log.d(TAG, "SignalStrength: " + String.valueOf(asu)); // It gives me a value which is 7
      signalAsu = asu;
    }
  };

@Override
public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  TelephonyManager SignalManager = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
  SignalManager.listen(signalListener,PhoneStateListener.LISTEN_SIGNAL_STRENGTH);
  //another log test
  Log.d(TAG, "SignalStrength: " + String.valueOf(signalAsu)); // zero value..
  }
}

Answer 1

运行

onCreate并在活动中将signalAsu设置为0。所以你的日志会说零，因为signalAsu尚未改变。忽略你的初始值为零，只需在调用onSignalStrengthChanged时收听，就像你对日志一样。

信号强度 - asu

1 个答案: