模拟接听电话的方法，兼容华为android5.0以上设备

/**
 * 通过反射调用的方法，接听电话，该方法只在android 2.3之前的系统上有效。
 *
 * @param context
 */
private static void answerRingingCallWithReflect(Context context) {
    try {
        Object telephonyObject = getTelephonyObject(context);
        if (null != telephonyObject) {
            Class telephonyClass = telephonyObject.getClass();
            Method endCallMethod = telephonyClass
                    .getMethod("answerRingingCall");
            endCallMethod.setAccessible(true);
            endCallMethod.invoke(telephonyObject);
            // ITelephony iTelephony = (ITelephony) telephonyObject;
            // iTelephony.answerRingingCall();
        }
    } catch (SecurityException e) {
        e.printStackTrace();
    } catch (IllegalArgumentException e) {
        e.printStackTrace();
    } catch (IllegalAccessException e) {
        e.printStackTrace();
    } catch (InvocationTargetException e) {
        e.printStackTrace();
    } catch (NoSuchMethodException e) {
        e.printStackTrace();
    }

}

/**
 * 伪造一个有线耳机插入，并按接听键的广播，让系统开始接听电话。
 *
 * @param context
 */
private static void answerRingingCallWithBroadcast(Context context) {
    try {
        Runtime runtime = Runtime.getRuntime();
        runtime.exec("input keyevent " +KeyEvent.KEYCODE_HEADSETHOOK);
    } catch (Exception e) {
        AudioManager audioManager = (AudioManager) context
                .getSystemService(Context.AUDIO_SERVICE);
        // 判断是否插上了耳机
        if (!audioManager.isWiredHeadsetOn()) {
            // 4.1以上系统限制了部分权限， 使用三星4.1版本测试提示警告：Permission Denial: not allowed to
            // send broadcast android.intent.action.HEADSET_PLUG from pid=1324,
            // uid=10017
            // 这里需要注意一点，发送广播时加了权限“android.permission.CALL_PRIVLEGED”，则接受该广播时也需要增加该权限。但是4.1以上版本貌似这个权限只能系统应用才可以得到。测试的时候，自定义的接收器无法接受到此广播，后来去掉了这个权限，设为NULL便可以监听到了。

            if (android.os.Build.VERSION.SDK_INT >= 15) {
                Intent meidaButtonIntent = new Intent(
                        Intent.ACTION_MEDIA_BUTTON);
                KeyEvent keyEvent = new KeyEvent(KeyEvent.ACTION_UP,
                        KeyEvent.KEYCODE_HEADSETHOOK);
                meidaButtonIntent.putExtra(Intent.EXTRA_KEY_EVENT, keyEvent);
                context.sendOrderedBroadcast(meidaButtonIntent, null);
            } else {
                // 以下适用于Android2.3及2.3以上的版本上 ，但测试发现4.1系统上不管用。
                Intent localIntent1 = new Intent(Intent.ACTION_HEADSET_PLUG);
                localIntent1.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
                localIntent1.putExtra("state", 1);
                localIntent1.putExtra("microphone", 1);
                localIntent1.putExtra("name", "Headset");
                context.sendOrderedBroadcast(localIntent1,
                        "android.permission.CALL_PRIVILEGED");

                Intent localIntent2 = new Intent(Intent.ACTION_MEDIA_BUTTON);
                KeyEvent localKeyEvent1 = new KeyEvent(KeyEvent.ACTION_DOWN,
                        KeyEvent.KEYCODE_HEADSETHOOK);
                localIntent2.putExtra(Intent.EXTRA_KEY_EVENT, localKeyEvent1);
                context.sendOrderedBroadcast(localIntent2,
                        "android.permission.CALL_PRIVILEGED");

                Intent localIntent3 = new Intent(Intent.ACTION_MEDIA_BUTTON);
                KeyEvent localKeyEvent2 = new KeyEvent(KeyEvent.ACTION_UP,
                        KeyEvent.KEYCODE_HEADSETHOOK);
                localIntent3.putExtra(Intent.EXTRA_KEY_EVENT, localKeyEvent2);
                context.sendOrderedBroadcast(localIntent3,
                        "android.permission.CALL_PRIVILEGED");

                Intent localIntent4 = new Intent(Intent.ACTION_HEADSET_PLUG);
                localIntent4.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
                localIntent4.putExtra("state", 0);
                localIntent4.putExtra("microphone", 1);
                localIntent4.putExtra("name", "Headset");
                context.sendOrderedBroadcast(localIntent4,
                        "android.permission.CALL_PRIVILEGED");
            }

        } else {
            Intent meidaButtonIntent = new Intent(Intent.ACTION_MEDIA_BUTTON);
            KeyEvent keyEvent = new KeyEvent(KeyEvent.ACTION_UP,
                    KeyEvent.KEYCODE_HEADSETHOOK);
            meidaButtonIntent.putExtra(Intent.EXTRA_KEY_EVENT, keyEvent);
            context.sendOrderedBroadcast(meidaButtonIntent, null);
        }
    }
}

/**
 * <br/>
 * 概述：接电话 <br/>
 *
 * @param context
 */
public static void answerRingingCall(Context context) {
    if (isGingerbreadOrlater()) {
        answerRingingCallWithBroadcast(context);
    } else {
        answerRingingCallWithReflect(context);
    }
}

由于谷歌官方在2016年的十月份给5.1以上的设备更新了安全补丁，导致了以上接电话的方法不能使用了（参考https://stackoverflow.com/questions/40673922/regd-support-of-answer-call-in-android-nougat/41356688#41356688），

目前只有一种方法可以测试通过，就是通过读取通知的权限来实现（参考https://stackoverflow.com/questions/41542245/programmatically-accept-call-in-nougat https://stackoverflow.com/a/43254844/7204388 ）。

但我也遇到了问题，读取通知是根据文字来获取对应的pendingIntent，然后再发送通知，但是有的来电话界面并没有对应的文字，所以是不能获取到对应的intent的。如果你有更好的解决方法，请联系我714094450