android - 如何在广播接收器处于摘机状态时启动音频歌曲，以及如何在拨盘关闭时停止音频歌曲

Question

当广播接收器 call 一个号码或状态为OFFHOOK时如何启动音频歌曲，以及在IDLE或 call 结束时如何停止音频歌曲。

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.telephony.TelephonyManager;
import android.widget.Toast;
import android.media.MediaPlayer;

public class Ringing extends BroadcastReceiver{
    Context context;
    public static MediaPlayer ob=null;
    @Override
    public void onReceive(Context context, Intent intent){
        String state = intent.getStringExtra(TelephonyManager.EXTRA_STATE);

        if(state.equals(TelephonyManager.EXTRA_STATE_OFFHOOK)){
           // Toast.makeText(context, "Call Recieved", Toast.LENGTH_LONG).show();
            ob = MediaPlayer.create(context,R.raw.trouble);
            ob.start();
        }
        if(state.equals(TelephonyManager.EXTRA_STATE_IDLE)){
           if(ob.isPlaying()) {
               ob.stop();
                ob.destroy();
           }
        }
    }
}

Answer 1

声明类变量，如下面的broadcastreceiver代码所示:

public class PhonecallReceiver extends BroadcastReceiver {
    static String phoneNumber;
    private static boolean ringing, received;
    .......................

接下来，在onReceive方法中放入以下代码:

收到电话号码后，状态为:
IDLE>铃声> OFFHOOK> IDLE

未收到电话号码时，状态为:
IDLE> RINGING> IDLE

当状态为RINGING时，将振铃变量设置为true，然后在状态为OFFHOOK时检查变量振铃是否为true，然后接听电话并启动音频，还将振铃设置为false并接收为true。
接下来，当状态为“空闲”时，检查接收到的变量是否为true，然后断开所选择的 call ，现在开始播放音乐。

@Override
    public void onReceive(Context context, Intent intent) {
        Bundle bundle = intent.getExtras();
        String state = bundle.getString(TelephonyManager.EXTRA_STATE);
        String temp = bundle.getString(TelephonyManager.EXTRA_INCOMING_NUMBER);
        if (!(state == null) && state.equals(TelephonyManager.EXTRA_STATE_RINGING)) {
            ringing = true;
            received = false;
        } else if (!(state == null) && state.equals(TelephonyManager.EXTRA_STATE_OFFHOOK) && ringing) {
            received = true;
            ringing = false;
            //add code to start music
        } else if (!(state == null) && state.equals(TelephonyManager.EXTRA_STATE_IDLE) && received) {
            //add code to stop music
            received = false;
            ringing = false;
        }
    }