在安卓API 17级中消费CellInfoWcdma类

Question

我正在使用TelephonyManager.getAllCellInfo（）查找邻居小区rssi信号，该信号返回CellInfo（为不同的蜂窝塔类型、gsm、lte、cdma ecc.扩展的抽象类）对象列表，其中包含我所需的所有信息。

我的应用程序是使用安卓API 17级构建的，运行良好。

当我在刚刚升级到Android4.3（API级别18）的新手机上运行该应用程序时，调用getAllCellInfo（）返回CellInfoWcdma（API级别18中添加的新类）的列表。

由于几个原因，我无法升级我的sdk。

如何在不升级sdk的情况下从此类对象中获取cell id和rssi？

谢谢！

Answer 1

使用反射：

private static class CellIdentityWcdma {
    private static Class<?> mCls;
    private static Method mGetCid;
    private static Method mGetLac;
    private static Method mGetMcc;
    private static Method mGetMnc;
    private static Method mGetPsc;
    static {
        try {
            mCls = Class.forName("android.telephony.CellIdentityWcdma");
            mGetCid = mCls.getMethod("getCid");
            mGetLac = mCls.getMethod("getLac");
            mGetMcc = mCls.getMethod("getMcc");
            mGetMnc = mCls.getMethod("getMnc");
            mGetPsc = mCls.getMethod("getPsc");
        } catch (final ClassNotFoundException e) {
        } catch (final NoSuchMethodException e) {
        }
    }
    private final Object mObj;
    public CellIdentityWcdma(final Object obj) {
        mObj = obj;
    }
    public int getCid() throws IllegalAccessException, InvocationTargetException {
        return ((Integer)mGetCid.invoke(mObj)).intValue();
    }
    public int getLac() throws IllegalAccessException, InvocationTargetException {
        return ((Integer)mGetLac.invoke(mObj)).intValue();
    }
    public int getMcc() throws IllegalAccessException, InvocationTargetException {
        return ((Integer)mGetMcc.invoke(mObj)).intValue();
    }
    public int getMnc() throws IllegalAccessException, InvocationTargetException {
        return ((Integer)mGetMnc.invoke(mObj)).intValue();
    }
    public int getPsc() throws IllegalAccessException, InvocationTargetException {
        return ((Integer)mGetPsc.invoke(mObj)).intValue();
    }
}
private static class CellSignalStrengthWcdma {
    private static Class<?> mCls;
    private static Method mGetAsuLevel;
    static {
        try {
            mCls = Class.forName("android.telephony.CellSignalStrengthWcdma");
            mGetAsuLevel = mCls.getMethod("getAsuLevel");
        } catch (final ClassNotFoundException e) {
        } catch (final NoSuchMethodException e) {
        }
    }
    private final Object mObj;
    public CellSignalStrengthWcdma(final Object obj) {
        mObj = obj;
    }
    public int getAsuLevel() throws IllegalAccessException, InvocationTargetException {
        return ((Integer)mGetAsuLevel.invoke(mObj)).intValue();
    }
}
private static class CellInfoWcdma {
    private static Class<?> mCls;
    private static Method mGetCellIdentity;
    private static Method mGetCellSignalStrength;
    static {
        try {
            mCls = Class.forName("android.telephony.CellInfoWcdma");
            mGetCellIdentity = mCls.getMethod("getCellIdentity");
            mGetCellSignalStrength = mCls.getMethod("getCellSignalStrength");
        } catch (final ClassNotFoundException e) {
        } catch (final NoSuchMethodException e) {
        }
    }
    private final Object mObj;
    public CellInfoWcdma(final Object obj) {
        mObj = obj;
    }
    public static boolean isInstance(final Object obj) {
        return null != mCls && mCls.isInstance(obj);
    }
    public CellIdentityWcdma getCellIdentity()
            throws IllegalAccessException, InvocationTargetException {
        return new CellIdentityWcdma(mGetCellIdentity.invoke(mObj));
    }
    public CellSignalStrengthWcdma getCellSignalStrength()
            throws IllegalAccessException, InvocationTargetException {
        return new CellSignalStrengthWcdma(mGetCellSignalStrength.invoke(mObj));
    }
}
private static void useCellInfo(final CellInfo cellInfo) {
    if (cellInfo instanceof CellInfoGsm) {
        useGsm((CellInfoGsm)cellInfo);
    } else if (cellInfo instanceof CellInfoLte) {
        useLte((CellInfoLte)cellInfo);
    } else if (cellInfo instanceof CellInfoCdma) {
        useCdma((CellInfoCdma)cellInfo);
    } else if (CellInfoWcdma.isInstance(cellInfo)) {
        useWcdma(new CellInfoWcdma(cellInfo));
    }
}