Java 如何阻止我的应用程序在从另一个应用程序切换回来后崩溃？

当我运行我的应用程序并按下home按钮，然后返回到我的应用程序时，会出现RunTimeException和IllegalStateException错误

我制作了一个简单的安卓字母游戏，游戏结束时，通过OK按钮显示时间量和错误次数，让用户返回主屏幕。但是，当我按下home（主页）按钮，然后返回到我的应用程序玩游戏时，在游戏结束时，只要用户单击ok（确定），我就会在Logcat中看到RunTimeException和IllegalStateException错误，游戏会返回（假设不是我的应用程序重新启动）到游戏主页。我在这里查看了几篇文章（如），并尝试了这些解决方案，但仍然出现以下错误。我也是新手，不知道这些解决方案与我的代码有什么关系。非常感谢您的帮助

/

/显示游戏结束结果对话框
公共void showGameOverDialog（）{
ViewGroup ViewGroup=findviewbyd（android.R.id.content）；
查看对话框View=LayoutFlater.from（this）.充气（R.layout.game\u over\u对话框，视图组，false）；
dialog=新建AlertDialog.Builder（此）；
dialog.setView（dialogView）；
TextView mTextView_errors=dialogView.findviewbyd（R.id.TextView_errors）；
String temp=getResources（）.getString（R.String.errors）+不正确计数；
mTextView_错误。setText（临时）；
TextView mTextView_timeUsed=dialogView.findviewbyd（R.id.TextView_timeUsedText）；
String temp2=getResources（）.getString（R.String.time_used）+mTimeUsed；
mTextView_timeUsed.setText（temp2）；
final AlertDialog AlertDialog=dialog.create（）；
最终意图=新意图（此，MainActivity.class）；
最终按钮btnReturnToHome=dialogView.findViewById（R.id.Button\u return\u to\u home）；
btnReturnToHome.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图）{
mBackground.release（）；
mCorrect.release（）；
mWrong.release（）；
星触觉（意向）；
完成（）；//您是否在实际设备上而不是模拟器上试用过您的应用程序？我注意到您的GLES库无法加载，我对您的情况不是百分之百满意，但GLES通常无法在模拟器上正常工作。
在浏览完所有互联网后，我发现了一些类似于我的应用程序的东西，并在我的代码上实现了它，现在它可以正常工作了很明显。但是，自从更新Android Studio之后，我仍然无法在真实设备上运行它。现在需要看看。顺便说一句，下面是我自己问题的解决方案。希望这能帮助其他使用AlertDialog和Media player并面临同样问题的人

@Override
    protected void onPause() {
        super.onPause();
        Log.wtf("OnPause is executed--------------------", "<----------");
        if(mBackground != null){
            //mBackground.stop();  <<<----This was also in the code that I found online, but it was causing error for me so I after commenting, it worked.
            mBackground.release();
            mBackground = null;
        }
        if(mCorrect != null){
            //mCorrect.stop();
            mCorrect.release();
            mCorrect = null;
        }
        if(mWrong != null){
            //mWrong.stop();
            mWrong.release();
            mWrong = null;
        }
    }
    @Override
    protected void onResume() {
        super.onResume();

            Log.wtf("OnResume is executed--------------------", "<----------");
            if (mBackground == null || !mBackground.isPlaying()){ 
                Log.wtf("on resume---", "<---player null or not playing");
                mBackground = MediaPlayer.create(AlphabetGame.this, R.raw.mursal_bensound_littleidea);
            }
            if (mBackground.isPlaying()){
                Log.wtf("on resume---", "<---- player playing");
                mBackground.stop();
                mBackground.release();
                mBackground = MediaPlayer.create(AlphabetGame.this, R.raw.mursal_bensound_littleidea);
            }
            if (mCorrect == null || !mCorrect.isPlaying()){
                Log.wtf("on resume---", "<---player null or not playing");
                mCorrect = MediaPlayer.create(AlphabetGame.this, R.raw.correct_choice);
            }
            if (mCorrect.isPlaying()){ 
                Log.wtf("on resume---", "<---- player playing");
                mCorrect.stop();
                mCorrect.release();
                mCorrect = MediaPlayer.create(AlphabetGame.this, R.raw.correct_choice);
            }
            if (mWrong == null || !mWrong.isPlaying()){
                Log.wtf("on resume---", "<---player null or not playing");
                mWrong = MediaPlayer.create(AlphabetGame.this, R.raw.wrong_choice);
            }
            if (mWrong.isPlaying()){
                Log.wtf("on resume---", "<---- player playing");
                mWrong.stop();
                mWrong.release();
                mWrong = MediaPlayer.create(AlphabetGame.this, R.raw.wrong_choice);
            }
            mBackground.start();
            mCorrect.start();
            mWrong.start();

    }```

@覆盖
受保护的void onPause（）{
super.onPause（）；
Log.wtf（“OnPause已执行-----------------”，“post logcat异常。很抱歉，它确实存在，但无法找出如何将纯文本从代码中分离出来，因此所有内容都混淆了。我认为您需要重新创建媒体播放器，尝试在OnPause（）中释放并重新创建onResume（），但这次内存泄漏，有3个错误指向其他地方。谢谢，但实际上它在两个不同的实际设备上完全失败。
2019-07-28 22:11:58.925 12873-12873/com.example.alphabetsforkids E/lphabetsforkid: Unknown bits set in runtime_flags: 0x8000
2019-07-28 22:12:00.003 12873-12897/com.example.alphabetsforkids E/vndksupport: Could not load /vendor/lib/egl/libGLES_emulation.so from sphal namespace: dlopen failed: library "/vendor/lib/egl/libGLES_emulation.so" not found.
2019-07-28 22:12:00.004 12873-12897/com.example.alphabetsforkids E/libEGL: load_driver(/vendor/lib/egl/libGLES_emulation.so): unknown
2019-07-28 22:12:02.358 12873-12896/com.example.alphabetsforkids E/EGL_emulation: tid 12896: eglQueryString(923): error 0x3008 (EGL_BAD_DISPLAY)
2019-07-28 22:13:42.203 13035-13061/com.example.alphabetsforkids E/vndksupport: Could not load /vendor/lib/egl/libGLES_emulation.so from sphal namespace: dlopen failed: library "/vendor/lib/egl/libGLES_emulation.so" not found.
2019-07-28 22:13:42.203 13035-13061/com.example.alphabetsforkids E/libEGL: load_driver(/vendor/lib/egl/libGLES_emulation.so): unknown
2019-07-28 22:13:43.663 13035-13060/com.example.alphabetsforkids E/EGL_emulation: tid 13060: eglQueryString(923): error 0x3008 (EGL_BAD_DISPLAY)
2019-07-28 22:13:47.845 13035-13035/com.example.alphabetsforkids E/OnResume is executed--------------------: <----------
2019-07-28 22:14:00.320 13035-13035/com.example.alphabetsforkids E/OnPause is executed--------------------: <----------
2019-07-28 22:14:05.848 13035-13035/com.example.alphabetsforkids E/OnResume is executed--------------------: <----------
2019-07-28 22:14:05.882 13035-13035/com.example.alphabetsforkids E/Music started on resume--------------------: <----------
2019-07-28 22:14:05.925 13035-13035/com.example.alphabetsforkids E/MediaPlayerNative: start called in state 1, mPlayer(0x0)
2019-07-28 22:14:05.925 13035-13035/com.example.alphabetsforkids E/MediaPlayerNative: error (-38, 0)
2019-07-28 22:14:05.927 13035-13035/com.example.alphabetsforkids E/MediaPlayerNative: start called in state 1, mPlayer(0x0)
2019-07-28 22:14:05.928 13035-13035/com.example.alphabetsforkids E/MediaPlayerNative: error (-38, 0)
2019-07-28 22:14:05.929 13035-13035/com.example.alphabetsforkids E/MediaPlayerNative: start called in state 1, mPlayer(0x0)
2019-07-28 22:14:05.930 13035-13035/com.example.alphabetsforkids E/MediaPlayerNative: error (-38, 0)
2019-07-28 22:14:06.828 13035-13035/com.example.alphabetsforkids E/MediaPlayer: Error (-38,0)
2019-07-28 22:14:06.831 13035-13035/com.example.alphabetsforkids E/MediaPlayer: Error (-38,0)
2019-07-28 22:14:20.377 13035-13035/com.example.alphabetsforkids E/MediaPlayerNative: start called in state 0, mPlayer(0x0)
2019-07-28 22:14:23.544 13035-13035/com.example.alphabetsforkids E/MediaPlayerNative: start called in state 0, mPlayer(0x0)
2019-07-28 22:14:23.553 13035-13035/com.example.alphabetsforkids E/time is greater than best time:  ----
2019-07-28 22:14:25.509 13035-13035/com.example.alphabetsforkids E/OnPause is executed--------------------: <----------
2019-07-28 22:14:25.521 13035-13035/com.example.alphabetsforkids E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.alphabetsforkids, PID: 13035
    java.lang.RuntimeException: Unable to pause activity {com.example.alphabetsforkids/com.example.alphabetsforkids.AlphabetGame}: java.lang.IllegalStateException
        at android.app.ActivityThread.performPauseActivityIfNeeded(ActivityThread.java:4306)
        at android.app.ActivityThread.performPauseActivity(ActivityThread.java:4257)
        at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:4209)
        at android.app.servertransaction.PauseActivityItem.execute(PauseActivityItem.java:46)
        at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:176)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1935)
        at android.os.Handler.dispatchMessage(Handler.java:107)
        at android.os.Looper.loop(Looper.java:214)
        at android.app.ActivityThread.main(ActivityThread.java:7116)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:925)
     Caused by: java.lang.IllegalStateException
        at android.media.MediaPlayer._reset(Native Method)
        at android.media.MediaPlayer.reset(MediaPlayer.java:2145)
        at com.example.alphabetsforkids.AlphabetGame.onPause(AlphabetGame.java:365)
        at android.app.Activity.performPause(Activity.java:7874)
        at android.app.Instrumentation.callActivityOnPause(Instrumentation.java:1500)
        at android.app.ActivityThread.performPauseActivityIfNeeded(ActivityThread.java:4296)
        at android.app.ActivityThread.performPauseActivity(ActivityThread.java:4257) 
        at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:4209) 
        at android.app.servertransaction.PauseActivityItem.execute(PauseActivityItem.java:46) 
        at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:176) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1935) 
        at android.os.Handler.dispatchMessage(Handler.java:107) 
        at android.os.Looper.loop(Looper.java:214) 
        at android.app.ActivityThread.main(ActivityThread.java:7116) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:925) 
2019-07-28 22:14:26.182 13144-13168/com.example.alphabetsforkids E/vndksupport: Could not load /vendor/lib/egl/libGLES_emulation.so from sphal namespace: dlopen failed: library "/vendor/lib/egl/libGLES_emulation.so" not found.
2019-07-28 22:14:26.182 13144-13168/com.example.alphabetsforkids E/libEGL: load_driver(/vendor/lib/egl/libGLES_emulation.so): unknown
2019-07-28 22:14:26.919 13144-13167/com.example.alphabetsforkids E/EGL_emulation: tid 13167: eglQueryString(923): error 0x3008 (EGL_BAD_DISPLAY)

@Override
    protected void onPause() {
        super.onPause();
        Log.wtf("OnPause is executed--------------------", "<----------");
        if(mBackground != null){
            //mBackground.stop();  <<<----This was also in the code that I found online, but it was causing error for me so I after commenting, it worked.
            mBackground.release();
            mBackground = null;
        }
        if(mCorrect != null){
            //mCorrect.stop();
            mCorrect.release();
            mCorrect = null;
        }
        if(mWrong != null){
            //mWrong.stop();
            mWrong.release();
            mWrong = null;
        }
    }
    @Override
    protected void onResume() {
        super.onResume();

            Log.wtf("OnResume is executed--------------------", "<----------");
            if (mBackground == null || !mBackground.isPlaying()){ 
                Log.wtf("on resume---", "<---player null or not playing");
                mBackground = MediaPlayer.create(AlphabetGame.this, R.raw.mursal_bensound_littleidea);
            }
            if (mBackground.isPlaying()){
                Log.wtf("on resume---", "<---- player playing");
                mBackground.stop();
                mBackground.release();
                mBackground = MediaPlayer.create(AlphabetGame.this, R.raw.mursal_bensound_littleidea);
            }
            if (mCorrect == null || !mCorrect.isPlaying()){
                Log.wtf("on resume---", "<---player null or not playing");
                mCorrect = MediaPlayer.create(AlphabetGame.this, R.raw.correct_choice);
            }
            if (mCorrect.isPlaying()){ 
                Log.wtf("on resume---", "<---- player playing");
                mCorrect.stop();
                mCorrect.release();
                mCorrect = MediaPlayer.create(AlphabetGame.this, R.raw.correct_choice);
            }
            if (mWrong == null || !mWrong.isPlaying()){
                Log.wtf("on resume---", "<---player null or not playing");
                mWrong = MediaPlayer.create(AlphabetGame.this, R.raw.wrong_choice);
            }
            if (mWrong.isPlaying()){
                Log.wtf("on resume---", "<---- player playing");
                mWrong.stop();
                mWrong.release();
                mWrong = MediaPlayer.create(AlphabetGame.this, R.raw.wrong_choice);
            }
            mBackground.start();
            mCorrect.start();
            mWrong.start();

    }```