当我需要在android中检测呼叫事件时，我应该在BroadcastReceiver和PhoneStateListener之间选择什么？答案

【问题标题】：What should I choose between BroadcastReceiver and PhoneStateListener when I need to detect call event in android?当我需要在android中检测呼叫事件时，我应该在BroadcastReceiver和PhoneStateListener之间选择什么？
【发布时间】：2014-04-14 10:13:51
【问题描述】：

我已阅读Detecting outgoing call and call hangup event in android

我想做一个应用程序来检测后台呼叫事件作为服务，我想我应该选择BroadcastReceiver，因为即使我退出应用程序，应用程序也会继续检测呼叫。我认为停止检测呼叫的唯一方法是在我使用 BroadcastReceiver 时卸载应用程序。

如果我选择PhoneStateListener，我认为如果我退出应用程序将停止检测呼叫。

对吗？

谢谢！

【问题讨论】：

标签： android

【解决方案1】：

在我看来，最好的方法是使用最简单的解决方案。也就是说，PhoneStateListener 会做你想做的事——在后台检测呼叫事件：

public class IncomingCallReciever extends BroadcastReceiver {

    private Context mContext;
    private Intent mIntent;

    @Override
    public void onReceive(Context context, Intent intent) {
        mContext = context;
        mIntent = intent;
        TelephonyManager tm = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
        int events = PhoneStateListener.LISTEN_CALL_STATE;
        tm.listen(phoneStateListener, events);
    }

    private final PhoneStateListener phoneStateListener = new PhoneStateListener() {
        @Override
        public void onCallStateChanged(int state, String incomingNumber) {
            String callState = "UNKNOWN";
            switch (state) {
            case TelephonyManager.CALL_STATE_IDLE:
                callState = "IDLE";
                break;
            case TelephonyManager.CALL_STATE_RINGING:
                // -- check international call or not.
                if (incomingNumber.startsWith("00")) {
                    Toast.makeText(mContext,"International Call- " + incomingNumber,Toast.LENGTH_LONG).show();
                    callState = "International - Ringing (" + incomingNumber+ ")";
                } else {
                    Toast.makeText(mContext, "Local Call - " + incomingNumber, Toast.LENGTH_LONG).show();
                    callState = "Local - Ringing (" + incomingNumber + ")";
                }
                break;
            case TelephonyManager.CALL_STATE_OFFHOOK:
                String dialingNumber = mIntent.getStringExtra(Intent.EXTRA_PHONE_NUMBER);
                if (dialingNumber.startsWith("00")) {
                    Toast.makeText(mContext,"International - " + dialingNumber,Toast.LENGTH_LONG).show();
                    callState = "International - Dialing (" + dialingNumber+ ")";
                } else {
                    Toast.makeText(mContext, "Local Call - " + dialingNumber,Toast.LENGTH_LONG).show();
                    callState = "Local - Dialing (" + dialingNumber + ")";
                }
                break;
            }
            Log.i(">>>Broadcast", "onCallStateChanged " + callState);
            super.onCallStateChanged(state, incomingNumber);
        }
    };

}

要访问状态，您需要在manifest file 中声明权限：

<uses-permission android:name="android.permission.READ_PHONE_STATE"/>

PhoneStateListener.LISTEN_CALL_STATE 所做的事情令人惊叹，实际上它比乍一看要容易得多，因为它为您提供了监控呼叫事件所需的一切。

【讨论】：