如何检测未接来电的挂断。？

Question

我发现了许多问题，这些问题描述了如何使用电话号码管理器.And获取电话呼叫状态，我在stackoverflow - How to detect when phone is answered or rejected中跟踪了这个问题。但这是为了单独检测不同的手机状态。，我需要添加一个警报对话框，只有当来电挂起而没有应答。如何检测这个特定的事件。？

Answer 1

Android5.0及以上版本可能会发送重复事件。你可以考虑保持以前的状态来比较-

private class PhoneStateChangeListener extends PhoneStateListener {

static final int IDLE = 0;
static final int OFFHOOK = 1;
static final int RINGING = 2;
int lastState = IDLE;

@Override
public void onCallStateChanged(int state, String incomingNumber) {
    switch(state){
        case TelephonyManager.CALL_STATE_RINGING:
             lastState = RINGING;
             break;
        case TelephonyManager.CALL_STATE_OFFHOOK:
             lastState = OFFHOOK;
             break;
        case TelephonyManager.CALL_STATE_IDLE:
             if (lastState == RINGING) {
                 // Process for call hangup without being answered
             }
             lastState = IDLE;
             break;
    }
}
}

Answer 2

尝尝这个,

你应该像这样创建广播接收器，

public class CallReciever extends BroadcastReceiver {

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

        if (intent.getStringExtra(TelephonyManager.EXTRA_STATE).equals(
                TelephonyManager.EXTRA_STATE_RINGING)) {

                // Phone number 
                String incomingNumber = intent.getStringExtra(TelephonyManager.EXTRA_INCOMING_NUMBER);

                // Ringing state
                // This code will execute when the phone has an incoming call
        } else if (intent.getStringExtra(TelephonyManager.EXTRA_STATE).equals(
                TelephonyManager.EXTRA_STATE_IDLE)
                || intent.getStringExtra(TelephonyManager.EXTRA_STATE).equals(
                        TelephonyManager.EXTRA_STATE_OFFHOOK)) {

            // This code will execute when the call is answered or disconnected
        }

    }
}

还在manifest.xml文件中添加以下内容。

<receiver android:name=".CallReciever" >
            <intent-filter>
                <action android:name="android.intent.action.PHONE_STATE" />
            </intent-filter>
 </receiver>

Answer 3

试试下面的代码：

private class PhoneStateChangeListener extends PhoneStateListener {
boolean isAnswered = false;
@Override
public void onCallStateChanged(int state, String incomingNumber) {
    switch(state){
        case TelephonyManager.CALL_STATE_RINGING:
             isAnswered  = false;
             break;
        case TelephonyManager.CALL_STATE_OFFHOOK:
             isAnswered=true;
             break;
        case TelephonyManager.CALL_STATE_IDLE:
             if(isAnswered == false)
             //Call hangup without answered
             break;
    }
  }
}