监测Android(安卓)2G CMCC Signal Strength

activity_main.xml

AndroidManifest.xml

MainActivity.java
public class MainActivity extends AppCompatActivity {    private TextView tv;    private TelephonyManager telephonyManager;    private MyPhoneStateListener mListener;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);       tv=(TextView) findViewById(R.id.tv);        telephonyManager= (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);        mListener=new MyPhoneStateListener();        if (ContextCompat.checkSelfPermission(this, Manifest.permission.CHANGE_NETWORK_STATE)                != PackageManager.PERMISSION_GRANTED){            ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.CHANGE_NETWORK_STATE},1);        }else {            telephonyManager.listen(mListener,PhoneStateListener.LISTEN_SIGNAL_STRENGTHS);        }    }    @Override    public void onRequestPermissionsResult(int requestCode,String[] permissions,int[] grantResults){        switch (requestCode){            case 1:                if (grantResults.length>0 && grantResults[0]== PackageManager.PERMISSION_GRANTED){                   telephonyManager.listen(mListener,LISTEN_SIGNAL_STRENGTHS);                }else {                    Toast.makeText(this,"You denied permissions",Toast.LENGTH_SHORT).show();                }                break;            default:        }    }    //PhoneStateListener     private class MyPhoneStateListener extends PhoneStateListener{        private int asu=0,lastSignal=0;        @Override        public void onSignalStrengthsChanged(SignalStrength signalStrength) {            super.onSignalStrengthsChanged(signalStrength);            asu=signalStrength.getGsmSignalStrength();            lastSignal=-113+2*asu;            Log.d("asu", String.valueOf(asu));            Log.d("signal", String.valueOf(lastSignal));            tv.setText("the current signal strength:"+lastSignal+"dBm");        }    }}
activity_main.xml

AndroidManifest.xml

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