通话状态

Question

我们如何以编程方式知道我正在拨打的电话已在另一方收到？ 我知道电话有一些状态，如空闲、摘机和振铃。 我希望收到通知：我正在拨打的电话已收到、对方已断开连接或对方无人接听。

请建议。

Answer 1

尽管 Android 电话管理器中只有三种可用状态，但很容易识别电话呼叫中所有情况的状态。
所以这里我们收到了来自 android 的 3 个事件，例如 RINGING、OFFHOOK 和 IDLE。为了获取呼叫的等待状态，我们需要定义自己的状态，例如RINGING、OFFHOOK、IDLE、FIRST_CALL_RINGING、SECOND_CALL_RINGING。
请以这样的方式思考：我们正在从 Android 接收事件，并且我们将定义我们的待命状态。
以下是在广播接收器的 onReceive 方法中获取通话状态的方法，无需注册 phonestatelistener 并避免其他复杂情况。查看代码。

public class CallListening  extends BroadcastReceiver {
    static CustomPhoneStateListener customPhoneListener;
    private static final String TAG ="broadcast_intent";
    public static String incoming_number;
    private String current_state,previus_state,event;
    public static Boolean dialog= false;
    private Context context;
    private SharedPreferences sp,sp1;
    private SharedPreferences.Editor spEditor,spEditor1;
    public void onReceive(Context context, Intent intent) {
        //Log.d("intent_log", "Intent" + intent);
        dialog=true;
        this.context = context;
        event = intent.getStringExtra(TelephonyManager.EXTRA_STATE);
        incoming_number = intent.getStringExtra(TelephonyManager.EXTRA_INCOMING_NUMBER);
        Log.d(TAG, "The received event : "+event+", incoming_number : " + incoming_number);
        previus_state = getCallState(context);
        current_state = "IDLE";
        if(incoming_number!=null){
            updateIncomingNumber(incoming_number,context);
        }else {
            incoming_number=getIncomingNumber(context);
        }
        switch (event) {
            case "RINGING":
                Log.d(TAG, "State : Ringing, incoming_number : " + incoming_number);
            if((previus_state.equals("IDLE")) || (previus_state.equals("FIRST_CALL_RINGING"))){
                    current_state ="FIRST_CALL_RINGING";
                }
                if((previus_state.equals("OFFHOOK"))||(previus_state.equals("SECOND_CALL_RINGING"))){
                    current_state = "SECOND_CALL_RINGING";
                }

                break;
            case "OFFHOOK":
                Log.d(TAG, "State : offhook, incoming_number : " + incoming_number);
                if((previus_state.equals("IDLE")) ||(previus_state.equals("FIRST_CALL_RINGING")) || previus_state.equals("OFFHOOK")){
                    current_state = "OFFHOOK";
                }
                if(previus_state.equals("SECOND_CALL_RINGING")){
                    current_state ="OFFHOOK";
                    startDialog(context);
                }
                break;
            case "IDLE":
                Log.d(TAG, "State : idle and  incoming_number : " + incoming_number);
                if((previus_state.equals("OFFHOOK")) || (previus_state.equals("SECOND_CALL_RINGING")) || (previus_state.equals("IDLE"))){
                    current_state="IDLE";
                }
                if(previus_state.equals("FIRST_CALL_RINGING")){
                    current_state = "IDLE";
                    startDialog(context);
                }
                updateIncomingNumber("no_number",context);
                Log.d(TAG,"stored incoming number flushed");
                break;
        }
        if(!current_state.equals(previus_state)){
            Log.d(TAG, "Updating  state from "+previus_state +" to "+current_state);
            updateCallState(current_state,context);

        }
    }
    public void startDialog(Context context) {
        Log.d(TAG,"Starting Dialog box");
        Intent intent1 = new Intent(context, NotifyHangup.class);
        intent1.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(intent1);

    }
    public void updateCallState(String state,Context context){
        sp = PreferenceManager.getDefaultSharedPreferences(context);
        spEditor = sp.edit();
        spEditor.putString("call_state", state);
        spEditor.commit();
        Log.d(TAG, "state updated");

    }
    public void updateIncomingNumber(String inc_num,Context context){
        sp = PreferenceManager.getDefaultSharedPreferences(context);
        spEditor = sp.edit();
        spEditor.putString("inc_num", inc_num);
        spEditor.commit();
        Log.d(TAG, "incoming number updated");
    }
    public String getCallState(Context context){
        sp1 = PreferenceManager.getDefaultSharedPreferences(context);
        String st =sp1.getString("call_state", "IDLE");
        Log.d(TAG,"get previous state as :"+st);
        return st;
    }
    public String getIncomingNumber(Context context){
        sp1 = PreferenceManager.getDefaultSharedPreferences(context);
        String st =sp1.getString("inc_num", "no_num");
        Log.d(TAG,"get incoming number as :"+st);
        return st;
    }
}

Answer 2

您需要一个 PhoneStateListener。这样就可以检查电话呼叫的状态。您必须实现onCallStateChanged。每次电话呼叫状态发生变化时都会调用此方法。然后你可以做这样的事情：

 switch(state) {
            case TelephonyManager.CALL_STATE_IDLE:
                    Log.d("Call","Outgoing Call finished");
            break;
            case TelephonyManager.CALL_STATE_OFFHOOK:
                    Log.d("Call","Outgoing Call Starting");
            break;
        }

Answer 3

我的理解是，除非我们具有内部包访问权限，否则我们无法区分 OFFHOOK 状态内的各种状态。

如果我们具有内部包访问权限，那么只有我们才能知道对方是否实际收到或错过或断开了连接的呼叫。

Answer 4

你必须使用broadcastreceiver和以下onReceive实现来检查phonestate的变化

@Override
public void onReceive(Context context, Intent intent) {
    this.context = context;
    final Bundle extras = intent.getExtras();
    if (intent.getAction().equals(
    TelephonyManager.ACTION_PHONE_STATE_CHANGED)){
        final String state = extras.getString(TelephonyManager.EXTRA_STATE);
        if ("IDLE".equals(state)){
            //TODO
        }
        if ("OFFHOOK".equals(state)){
            //TODO
        }
        if ("RINGING".equals(state)){
            //TODO
        }
    }
}

如果你想检查中间状态，你可以添加例如整数形式的状态控制....