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社区首页 >问答首页 >多个MediaPlayers持续失败-安卓工作室

问多个MediaPlayers持续失败-安卓工作室
EN

Stack Overflow用户
提问于 2018-05-31 08:05:26
回答 1查看 453关注 0票数 0

我是Android和Java开发的新手，正在寻找一些关于设置一个简单的soundboard应用程序的指导。我正在尝试做的事情是为多个媒体播放器处理事件，并且在让它有效地工作方面遇到了问题。

例如，我正在创建一个soundboard，当我单击一个按钮时，我希望所有其他声音停止并从内存中释放，以及我刚刚按下的按钮播放其指定的声音。我意识到重复代码块不是一种好的编程方法，但我也尝试过使用数组和switch语句，但收效甚微。任何关于在使用多个MediaPlayers时如何有效地从内存中释放声音的指导对我来说都非常有用。我在下面的代码中包含了4个按钮(我在这个应用上有超过30个按钮)

public class MainActivity extends AppCompatActivity {


private MediaPlayer Meow1,Meow2,Meow3,Meow4;
private Button meowButton1,meowButton2,meowButton3,meowButton4;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);



 Meow1 = new MediaPlayer();
        Meow1 = MediaPlayer.create(getApplicationContext(), R.raw.meow1);
       // final Boolean Meow1Pause = !Meow1.isPlaying() && Meow1.getCurrentPosition() >1;
        meowButton1 = (Button) findViewById(R.id.Meow1);
        meowButton1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (Meow1.isPlaying())
                { pauseMusic1();
                } else {
                    Meow1.start();
                }}
        });
        Meow1.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer Meow1) {
                Meow1.stop();
                Meow1.reset();
                Meow1.release();

            }
        });



       Meow2 = new MediaPlayer();
       Meow2 = MediaPlayer.create(getApplicationContext(), R.raw.meow2);

        meowButton2 = (Button) findViewById(R.id.Meow2);
        meowButton2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (Meow2.isPlaying() ){
                    pauseMusic();
                } else {
                    Meow2.start();      
        }}
        });

        Meow2.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer Meow1) {
                Meow2.stop();
                Meow2.reset();
                Meow2.release();
            }
        });

        Meow3 = new MediaPlayer();
        Meow3 = MediaPlayer.create(getApplicationContext(), R.raw.meow3);
        meowButton3 = (Button) findViewById(R.id.Meow3);
        meowButton3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (Meow3.isPlaying())
                { pauseMusic();
                } else {
                    Meow3.start();
                }}
        });
        Meow3.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer Meow1) {
                Meow3.stop();
                Meow3.reset();
                Meow3.release();

            }
        });

        Meow4 = new MediaPlayer();
        Meow4  = MediaPlayer.create(getApplicationContext(), R.raw.meow4);
        meowButton4 = (Button) findViewById(R.id.Meow4);
        meowButton4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (Meow4.isPlaying())
                { pauseMusic();
                } else {
                    Meow4.start();
                }}
        });

}
public void pauseMusic()  {
    if(Meow1 != null && Meow1.isPlaying()) Meow1.pause();
    if(Meow2 != null && Meow2.isPlaying()) Meow2.pause();
    if(Meow3 != null && Meow3.isPlaying()) Meow3.pause();
    if(Meow4 != null && Meow4.isPlaying()) Meow4.pause();
}


}

Run Compiler:
A: Logging event (FE): screen_view(_vs), Bundle[{firebase_event_origin(_o)=auto, firebase_previous_class(_pc)=SplashScreen, firebase_previous_id(_pi)=-6549553702477848745, firebase_screen_class(_sc)=MainActivity, firebase_screen_id(_si)=-6549553702477848744}]
I/zygote: Do partial code cache collection, code=124KB, data=67KB
I/zygote: After code cache collection, code=124KB, data=67KB
I/zygote: Increasing code cache capacity to 512KB
V/FA: Activity resumed, time: 6376787
D/EGL_emulation: eglMakeCurrent: 0x980fde60: ver 3 0 (tinfo 0xa3c3c290)
D/EGL_emulation: eglMakeCurrent: 0x980fde60: ver 3 0 (tinfo 0xa3c3c290)
D/EGL_emulation: eglMakeCurrent: 0x980fde60: ver 3 0 (tinfo 0xa3c3c290)
I/chatty: uid=10085(u0_a85) RenderThread identical 2 lines
D/EGL_emulation: eglMakeCurrent: 0x980fde60: ver 3 0 (tinfo 0xa3c3c290)
V/FA: Inactivity, disconnecting from the service
V/MediaPlayer: resetDrmState:  mDrmInfo=null mDrmProvisioningThread=null mPrepareDrmInProgress=false mActiveDrmScheme=false
               cleanDrmObj: mDrmObj=null mDrmSessionId=null
V/MediaPlayer: resetDrmState:  mDrmInfo=null mDrmProvisioningThread=null mPrepareDrmInProgress=false mActiveDrmScheme=false
               cleanDrmObj: mDrmObj=null mDrmSessionId=null
D/TAG1: Button 2 pressed
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
                  Process: g.convery.cat_sounds, PID: 12276
                  java.lang.IllegalStateException
                      at android.media.MediaPlayer.isPlaying(Native Method)
                      at g.convery.cat_sounds.MainActivity$1.onClick(MainActivity.java:97)
                      at android.view.View.performClick(View.java:6256)
                      at android.view.View$PerformClick.run(View.java:24701)
                      at android.os.Handler.handleCallback(Handler.java:789)
                      at android.os.Handler.dispatchMessage(Handler.java:98)
                      at android.os.Looper.loop(Looper.java:164)
                      at android.app.ActivityThread.main(ActivityThread.java:6541)
                      at java.lang.reflect.Method.invoke(Native Method)
                      at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
W/MediaPlayer-JNI: MediaPlayer finalized without being released
W/MediaPlayer-JNI: MediaPlayer finalized without being released
Application terminated.


LOGCAT:

05-31 09:21:30.099 12276-12288/g.convery.cat_sounds W/MediaPlayer-JNI: MediaPlayer finalized without being released
05-31 09:21:30.211 12276-12288/g.convery.cat_sounds I/chatty: uid=10085(u0_a85) FinalizerDaemon identical 33 lines
05-31 09:21:30.212 12276-12288/g.convery.cat_sounds W/MediaPlayer-JNI: MediaPlayer finalized without being released
05-31 09:21:30.283 12276-12284/g.convery.cat_sounds I/zygote: Do partial code cache collection, code=124KB, data=67KB
05-31 09:21:30.286 12276-12284/g.convery.cat_sounds I/zygote: After code cache collection, code=124KB, data=67KB
05-31 09:21:30.287 12276-12284/g.convery.cat_sounds I/zygote: Increasing code cache capacity to 512KB
05-31 09:21:31.159 12276-12307/g.convery.cat_sounds I/chatty: uid=10085(u0_a85) RenderThread identical 2 lines
05-31 09:24:41.746 12276-12276/g.convery.cat_sounds E/AndroidRuntime: FATAL EXCEPTION: main
    Process: g.convery.cat_sounds, PID: 12276
    java.lang.IllegalStateException
        at android.media.MediaPlayer.isPlaying(Native Method)
        at g.convery.cat_sounds.MainActivity$1.onClick(MainActivity.java:97)
        at android.view.View.performClick(View.java:6256)
        at android.view.View$PerformClick.run(View.java:24701)
        at android.os.Handler.handleCallback(Handler.java:789)
        at android.os.Handler.dispatchMessage(Handler.java:98)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6541)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
05-31 09:24:47.955 12276-12288/g.convery.cat_sounds W/MediaPlayer-JNI: MediaPlayer finalized without being released
05-31 09:24:47.956 12276-12288/g.convery.cat_sounds W/MediaPlayer-JNI: MediaPlayer finalized without being released
java
android
android-studio
EN

回答 1

Stack Overflow用户

发布于 2018-05-31 08:16:39

在释放媒体播放器之后，您正在使用它。从onCompletionListener中删除这些行，并将它们添加到活动的onDestroy中

Meow1.release();
Meow2.release();
Meow3.release();
Meow4.release();

另外，调用create会自动创建一个新实例，您也可以删除这些行

Meow1 = new MediaPlayer();
Meow2 = new MediaPlayer();
Meow3 = new MediaPlayer();
Meow4 = new MediaPlayer();

一种更好的方法是使用单个媒体播放器，当每个用户想要播放不同的源时，只需更改数据源，但这种方法在播放音频之前将需要一段时间，因为它将每次都准备音频，除非您的音频大小非常大，否则可以忽略不计

票数 0
EN
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：

https://stackoverflow.com/questions/50614911

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