得到SignalStrength没有使用PhoneStateListener onSignalStrengthchanged

问题描述

没有人知道如何获得的信号强度，而不必调用onSignalStrengthChanged。与onSignalStrengthchanged的问题是，它是被称为当信号强度的变化和我需要根据不同的标准来获得signalstrength的值。

does anyone know how to get the signal strength without having to call the onSignalStrengthChanged. The problem with onSignalStrengthchanged is that is it called when the signal strength changes and I need to get the value of signalstrength according to a different criteria.

在此先感谢。

推荐答案

在API级别17的仅，这里的一些code，可以在活动中使用（或任何其他上下文子类）：

On API level 17 only, here's some code that can be used in an Activity (or any other Context child class):

import android.telephony.CellInfo;
import android.telephony.CellInfoCdma;
import android.telephony.CellInfoGsm;
import android.telephony.CellInfoLte;
import android.telephony.CellSignalStrengthCdma;
import android.telephony.CellSignalStrengthGsm;
import android.telephony.CellSignalStrengthLte;
import android.telephony.TelephonyManager;

try {
    final TelephonyManager tm = (TelephonyManager) this.getSystemService(Context.TELEPHONY_SERVICE);
    for (final CellInfo info : tm.getAllCellInfo()) {
        if (info instanceof CellInfoGsm) {
            final CellSignalStrengthGsm gsm = ((CellInfoGsm) info).getCellSignalStrength();
            // do what you need
        } else if (info instanceof CellInfoCdma) {
            final CellSignalStrengthCdma cdma = ((CellInfoCdma) info).getCellSignalStrength();
            // do what you need
        } else if (info instanceof CellInfoLte) {
            final CellSignalStrengthLte lte = ((CellInfoLte) info).getCellSignalStrength();
            // do what you need
        } else {
            throw new Exception("Unknown type of cell signal!");
        }
    }
} catch (Exception e) {
    Log.e(TAG, "Unable to obtain cell signal information", e);
}

Android系统

previous版本需要咨询的听众，没有其他替代方案（见此链接）。

Previous versions of Android require you to call the listener, there is no other alternative (see this link).

另外，还要确保你的应用程序中包含相应的权限。

Also ensure that your application contains the appropriate permissions.

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