安卓电话CellSignalStrength

Question

对不起我的英语不好。

我想问一下android电话: CellSignalStrength

我有下面的代码来显示android上的信号强度信息。

public class MainActivity extends AppCompatActivity  {

private TextView textView2;

public String gsmStrength;

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

   
    textView2 = (TextView) findViewById(R.id.textView2);

    TelephonyManager tm = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);



    try {

        for (CellInfo info : tm.getAllCellInfo()) {
            if (info instanceof CellInfoGsm) {
                CellSignalStrengthGsm gsm = ((CellInfoGsm) info).getCellSignalStrength();
                // do what you need
                gsmStrength = String.valueOf(gsm.getDbm());
            } else if (info instanceof CellInfoCdma) {
                CellSignalStrengthCdma cdma = ((CellInfoCdma) info).getCellSignalStrength();
                gsmStrength = String.valueOf(cdma.getDbm());
            } else if (info instanceof CellInfoLte) {
                CellSignalStrengthLte lte = ((CellInfoLte) info).getCellSignalStrength();
                gsmStrength = String.valueOf(lte.getDbm());
            } else {
                gsmStrength = String.valueOf("UNknown");
            }

        }


    }catch (Exception e){
        Log.d("SignalStrength", "+++++++++++++++++++++++++++++++ null array spot 3: " + e);
    }

    textView2.setText(gsmStrength.toString());

当我运行它时，结果是-93。

因此，我想要的是字符串形式的结果，其中包含了什么信息: SIGNAL_STRENGTH_GOOD SIGNAL_STRENGTH_GREAT SIGNAL_STRENGTH_MODERATE SIGNAL_STRENGTH_POOR。

如下所示：

​

而不是数字-93早期的

Answer 1

不要使用getDbm()来返回“信号强度作为dBm”，您应该使用getLevel()

检索整体信号质量的抽象级别值。在SIGNAL_STRENGTH_NONE_OR_UNKNOWN和SIGNAL_STRENGTH_GREAT包含之间返回int值

https://developer.android.com/reference/android/telephony/CellSignalStrengthGsm#getLevel()

所以您可以从CellSignalStrength获得一个int值。

CellSignalStrength.SIGNAL_STRENGTH_GOOD
CellSignalStrength.SIGNAL_STRENGTH_GREAT
CellSignalStrength.SIGNAL_STRENGTH_MODERATE
CellSignalStrength.SIGNAL_STRENGTH_NONE_OR_UNKNOWN
CellSignalStrength.SIGNAL_STRENGTH_POOR

如果您仍然希望得到一个字符串，而不是您可以使用的int

public static String getLevelString(int level) {
    switch(level) {
        case CellSignalStrength.SIGNAL_STRENGTH_GOOD:
            return "SIGNAL_STRENGTH_GOOD";
        case CellSignalStrength.SIGNAL_STRENGTH_GREAT:
            return "SIGNAL_STRENGTH_GREAT";
        case CellSignalStrength.SIGNAL_STRENGTH_MODERATE:
            return "SIGNAL_STRENGTH_MODERATE";
        case CellSignalStrength.SIGNAL_STRENGTH_NONE_OR_UNKNOWN:
            return "SIGNAL_STRENGTH_NONE_OR_UNKNOWN";
        case CellSignalStrength.SIGNAL_STRENGTH_POOR:
            return "SIGNAL_STRENGTH_POOR";
        default:
            throw new RuntimeException("Unsupported level " + level);
    }
}