Android：如何确定应用程序是否以无GSM信号或低信号启动？

Question

我写了一段Android代码，注册了PhoneStateListener和。{ 当有变化时，报告GSM信号强度值 onSignalStrengthsChanged回调。一切正常，但我想拥有 第一次改变之前的初始信号强度发生..有没有办法 在onCreate方法结束之前找出GSM信号强度 （参见代码末尾的注释行）？

这是我的代码：

public class MainActivity extends Activity {

private int mStrength;
private PhoneStateListener phoneStateListener;
private TelephonyManager telephonyManager;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    phoneStateListener = new PhoneStateListener() {
        @Override
        public void onSignalStrengthsChanged(SignalStrength signalStrength){
             super.onSignalStrengthsChanged(signalStrength);
             int currStrength = signalStrength.getGsmSignalStrength();
             mStrength = currStrength;

             Toast.makeText(getApplicationContext(),
                          "signal:" + String.valueOf(mStrength),
                          Toast.LENGTH_SHORT).show();
        }               
    };

    telephonyManager = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
    telephonyManager.listen(phoneStateListener,
               PhoneStateListener.LISTEN_SIGNAL_STRENGTHS);

    // What is value of GSM signal here? ...
    // Log.d("SignalStrength:", "??");

}

}

Answer 1

您是否可以使用API​​级别7中添加的this SignalStrength class？