我是一个安卓新手。
如何以百分比(1-100%)的形式获取GSM信号强度?
我是一个安卓新手。
如何以百分比(1-100%)的形式获取GSM信号强度?
SignalStrength
对象(如果没有,还有另一个不错的答案介绍了如何创建),在Marshmallow中,可以使用方法getGsmLevel()
(还有其他信号和甚至组合的方法)来解决这个问题,它返回一个线性化的0-4比例尺。您可以从类SignalStrength
中检查源代码。/**
* Get gsm as level 0..4
*
* @hide
*/
public int getGsmLevel() {
int level;
// ASU ranges from 0 to 31 - TS 27.007 Sec 8.5
// asu = 0 (-113dB or less) is very weak
// signal, its better to show 0 bars to the user in such cases.
// asu = 99 is a special case, where the signal strength is unknown.
int asu = getGsmSignalStrength();
if (asu <= 2 || asu == 99) level = SIGNAL_STRENGTH_NONE_OR_UNKNOWN;
else if (asu >= 12) level = SIGNAL_STRENGTH_GREAT;
else if (asu >= 8) level = SIGNAL_STRENGTH_GOOD;
else if (asu >= 5) level = SIGNAL_STRENGTH_MODERATE;
else level = SIGNAL_STRENGTH_POOR;
if (DBG) log("getGsmLevel=" + level);
return level;
}
将0-100%的刻度用于此事不具有意义,因为这是一个小的粒度。因此通常使用0-4范围,并且在这种方法中已经线性化。如果不是在Marshmallow中,则只需适应此方法以接收对象作为值。如果您真的需要某些原因的0-100范围,您应该使用dB到线性转换函数,但我不知道GSM信号的增益因子。
getGsmLevel()
的代码并将其调整为一个静态方法,该方法以 SignalStrength
对象作为参数,并使用它来获取调用 getGsmSignalStrength()
的 ASU 值,该方法在所有版本中都存在。 - Yago Méndez Vidal public class MyActivity extends Activity {
public static final int UNKNOW_CODE = 99;
int MAX_SIGNAL_DBM_VALUE = 31;
TelephonyManager tel;
MyPhoneStateListener myPhoneStateListener;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
View view = getLayoutInflater().inflate(R.layout.activity_about, null);
setContentView(view);
myPhoneStateListener = new MyPhoneStateListener();
tel = (TelephonyManager) PpsApplication.getAppContext().getSystemService(Context.TELEPHONY_SERVICE);
tel.listen(myPhoneStateListener, PhoneStateListener.LISTEN_SIGNAL_STRENGTHS);
}
private class MyPhoneStateListener extends PhoneStateListener {
/* Get the Signal strength from the provider, each tiome there is an update */
@Override
public void onSignalStrengthsChanged(SignalStrength signalStrength) {
super.onSignalStrengthsChanged(signalStrength);
if (null != signalStrength && signalStrength.getGsmSignalStrength() != UNKNOW_CODE) {
int signalStrengthPercent = calculateSignalStrengthInPercent(signalStrength.getGsmSignalStrength());
viewModel.setSignalStrengthString(IntegerHelper.getString(signalStrengthPercent));
}
}
}
private int calculateSignalStrengthInPercent(int signalStrength) {
return (int) ((float) signalStrength / MAX_SIGNAL_DBM_VALUE * 100);
}
}
请注意,.getGsmSignalStrength();现在只返回0-5、99之间的信号强度条。
实际值现已隐藏。您仍然可以使用反射获取它们:
int strength=signalStrength.getGsmSignalStrength();//number of bars not ASU
Log.v("Mobile","BARS: "+strength);
try{//Actual signal strength is hidden
Class classFromName = Class.forName(SignalStrength.class.getName());
java.lang.reflect.Method method = classFromName.getDeclaredMethod("getAsuLevel");//getDbm
strength = (int) method.invoke(signalStrength);
}catch (Exception ex){Log.v("Mobile","cant retreive");}
if (strength == 99 ) { Log.v("Mobile", "ERROR! GSM signal strength not available!");return;}//99 = Unknown
if (strength == 255) { Log.v("Mobile", "ERROR! UMTS signal strength not available!");return;}//255 = Unknown
以上示例仅适用于ASU,似乎比Dbm更有效。获得ASU值后,您可以将其转换为百分比:
Log.v("Mobile","ASU: "+strength);
//Data.mobile_signal=strength*20;//Number of bars 0-5
//Data.mobile_signal = 100-((strength-113)/62);//GSM DBM
Data.mobile_signal =(int)((double)strength*100/31);//GSM ASU
Data.mobile_signal =(int)((double)strength*100/91);//UMTS ASU
Log.v("Mobile","Set GSM signal from "+strength+" to "+Data.mobile_signal);
signalStrength.level
此函数返回一个0到4的值,您应该从您的Android设备中熟悉它。可以将其视为信号条数。这在GSM和CDMA上都兼容。