Unity在安卓中退出activity会kill掉整个APP问题

      最近用Unity开发AR项目中遇到Unity在安卓APP中退出activity时会kill掉整个的APP问题,  本来目的是在Unity界面上点击一个返回按钮从而退出UnityPlayerActivity，但发现直接finish UnityPlayerActivity会将整个APP kill掉而不是返回到上一个activity。究其原因是UnityPlayerActivity在onDestroy中调用mUnityPlayer.quit()时会kill掉APP进程。在网上查看了一些方法，经验证采用以下两种方法，都可以解决这个问题。

方法一：

1. 定义一个类MyUnityPlayer继承UnityPlayer并重写其kill()方法。

public class MyUnityPlayer extends UnityPlayer {
    public MyUnityPlayer(ContextWrapper contextWrapper) {
        super(contextWrapper);
    }

    @Override
    protected void kill() {}
}

2.在UnityPlayerActivity中替换 UnityPlayer

// Setup activity layout
    @Override protected void onCreate (Bundle savedInstanceState)
    {   
  ...  

    //mUnityPlayer = new UnityPlayer(this);

...
    }

3.在unity中调用android接口返回上级activity

unity调用android接口：

private static void BackToShelfFromAndroid() {

using (AndroidJavaClass jc = new AndroidJavaClass("com.dps.core.UnityInterface")) {

jc.CallStatic("backToShelf");

}

}

实现android接口：

public static void backToShelf() {
// TODO Auto-generated method stub
        Log.i("unity","finish unityPlayer ");
        UnityPlayer.currentActivity.finish();
}

方法二：

1.创建一个UnityReaderActivity继承UnityPlayerActivity，在此注册一个广播接收，接收到广播后finish此UnityReaderActivity。在onPause中用super.onDestroy()替换掉super.onPause()。

public class UnityReaderActivity extends UnityPlayerActivity {
// 自身的引用

private BroadcastReceiver receiver;


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
registBroadcast();
}


// Pause Unity
@Override
protected void onPause() {
if (receiver != null) {
unregisterReceiver(receiver);
}
super.onDestroy(); //此处是关键
//super.onPause();
}


private void registBroadcast()
{
receiver = new FinishUnityBroadcast();
IntentFilter filter = new IntentFilter();
filter.addAction("finishunity");
registerReceiver(receiver, filter);
}


class FinishUnityBroadcast extends BroadcastReceiver
{
@Override
public void onReceive(Context context, Intent intent) {

finish();
}
}

}

2. 使用时调用UnityReaderActivity ，在AndroidManifest.xml中注册UnityReaderActivity

           android:name=".UnityReaderActivity"
            android:configChanges="mcc|mnc|locale|touchscreen|keyboard|keyboardHidden|navigation|orientation|screenLayout|uiMode|screenSize|smallestScreenSize|fontScale|layoutDirection"
            android:hardwareAccelerated="true"
            android:label="@string/app_name"
            android:launchMode="singleTask"
            android:screenOrientation="portrait"
            android:windowSoftInputMode="adjustResize" >
                            android:name="unityplayer.UnityActivity"
                android:value="true" />
       

3.在unity中调用android接口发送广播结束UnityReaderActivity返回上级activity

unity调用android接口：

private static void BackToShelfFromAndroid() {

using (AndroidJavaClass jc = new AndroidJavaClass("com.dps.core.UnityInterface")) {

jc.CallStatic("backToShelf");

}

}

实现android接口：

public static void backToShelf() {

// TODO Auto-generated method stub
    Log.i("unity","finish unityPlayer ");
    mContext.sendBroadcast(new Intent("finishunity"));
}