广播员被称为，但不称呼

Question

在下面的代码调试时，broadcaseivercustom被称为，但phonEstateListEnercustom却不是。

就目前而言，我和仅在Broadcastreceivercustom中采取的行动，但Maynot不是最好的场所。有什么建议为什么不称呼phonEstateListener？出于可能的原因，已经花了很多时间了吗？清单文件都是正确的，正确的权限。我看到没有运行时异常。

broadcastreceivercustom.java

public class BroadcastReceiverCustom extends BroadcastReceiver {

private static final String TAG = "BroadcastReceiverCustom";

    @Override
    public void onReceive(Context context, Intent intent) {

        Log.v(TAG, "WE ARE INSIDE!!!!!!!!!!!");

        TelephonyManager telephony = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);
        PhoneStateListenerCustom phoneStateListenerCustom = new PhoneStateListenerCustom();
        telephony.listen(phoneStateListenerCustom, PhoneStateListener.LISTEN_CALL_STATE);
    }
}

phonEstateListEnercustom.java

public class PhoneStateListenerCustom extends PhoneStateListener {

    private static final String TAG = "PhoneStateListenerCustom";

    public void onCallStateChange(int state, String incomingNumber){

        Log.v(TAG, "WE ARE INSIDE!!!!!!!!!!!");
        switch(state){
            case TelephonyManager.CALL_STATE_RINGING:
                 Log.d(TAG, "RINGING");
                 break;
        }

        super.onCallStateChanged(state, incomingNumber);

    }
}

清单文件

<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<receiver android:name=".BroadcastReceiverCustom">
    <intent-filter>
        <action android:name="android.intent.action.PHONE_STATE" />
    </intent-filter>
</receiver>

Answer 1

您不应在广播员中实例化电话管理器和PhonEstateListener。这是一些示例代码：

在活动中：

EndCallListener callListener = new EndCallListener;
TelephonyManager mTM = (TelephonyManager)this.getSystemService(Context.TELEPHONY_SERVICE);
mTM.listen(callListener, PhoneStateListener.LISTEN_CALL_STATE);

private class EndCallListener extends PhoneStateListener {
    @Override
    public void onCallStateChanged(int state, String incomingNumber) {
        if(TelephonyManager.CALL_STATE_RINGING == state) {
            Log.i(LOG_TAG + "Listener", "RINGING, number: " + incomingNumber);
        }
        if(TelephonyManager.CALL_STATE_OFFHOOK == state) {
            Log.i(LOG_TAG + "Listener", "OFFHOOK, number: " + incomingNumber);
        }
        if(TelephonyManager.CALL_STATE_IDLE == state) {
            Log.i(LOG_TAG + "Listener", "IDLE, number: " + incomingNumber);
        }
    }
}

Answer 2

尝试添加 @Override 之前 onCallStateChange 方法

Answer 3

我只是想补充一下Vairavan 这个 答案是，引用phonEstateListener的内部变化。它现在以弱参考来持有，这意味着一旦方法返回，phonEstateListener实例将用于垃圾收集。因此，您应该将参考文献保留在课程中，该课程将在您期望收听回调的一生中坚持下去，例如 Activity, Service, ， 或者 Application 课程。

看： https://github.com/aosp-mirror/platform_frameworks_base/commit/commit/f57c587e86c64e657a15a15a15a15a12ad75d47c48d99 #diff-5iff-5iff-5iff-5af2AC899DAC89DE89DE823CF60597E55FE0.