android - 如何检测未接听的来电挂断。？

Question

我发现很多问题都在描述如何使用 telephonymanager 获取电话的通话状态。我在 stackoverflow 中关注了这个问题 - How to detect when phone is answered or rejected .但这是为了分别检测各种电话状态。 只有当来电挂断且无人接听时，我才需要添加提醒对话框。 如何检测此特定事件。？

Answer 1

Android 5.0 及更高版本可能会发送重复事件。您可以考虑保留之前的状态以进行比较 -

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;
    }
}
}