Java Android-MediaPlayer在用和非法状态例外

我有一个MediaPlayer的活动和服务。我想从活动中控制这个玩家。但是，当我试图重置播放器时，我的应用程序在LogCat中出现IllegalStateException崩溃。 这是我的密码：

main活动

---

---

Player.class（服务）

---

---

我如何尝试与玩家互动：

service.player.(command_name);

请帮帮我！ 请原谅我的英语很糟糕

---

更新 LogCat

---

在运行

start（）

方法之前，需要在

mediaPlayer

上执行

prepare

或

prepareAsync

。很可能这就是导致您的非法状态异常的原因。我已经在service.mediaPlayer.start（）之前使用了prepare（），但它在更早的时候崩溃了，即联机service.mediaPlayer.reset（）；然后显示崩溃报告以更好地评估情况。我已经更新了问题：为什么您不在服务中执行mediaPlayer功能，如在

播放器

类中运行

重置

，

设置数据源

，

准备

。

public class Player extends Service
{
public MediaPlayer mediaPlayer = null;

public Player() {}

public void onCreate() {
    super.onCreate();
    if (mediaPlayer == null) mediaPlayer = new MediaPlayer();
}

public IBinder onBind(Intent intent) {
    if (mediaPlayer == null) mediaPlayer = new MediaPlayer();
    return new Binder();
}

public void onRebind(Intent intent) {
    super.onRebind(intent);
    try {
        mediaPlayer.stop();
    } catch (Exception ex) {}
}

public boolean onUnbind(Intent intent) {
    return super.onUnbind(intent);
}

public void onDestroy() {
    super.onDestroy();
    try {
        mediaPlayer.stop();
    } catch (Exception ex) {}
}
}

service.player.(command_name);

build.bootloader: unknown
build.brand: acer
build.cpu_abi: armeabi-v7a
build.cpu_abi2: armeabi
build.device: B1-A71
build.display: Acer_AV051_B1-A71_1.174.00_WW_GEN1
build.fingerprint: acer/B1-A71_ww_gen1/B1-A71:4.1.2/JZO54K/1361327270:user/release-keys
build.hardware: mt6517
build.host: asd1sd3
build.id: JZO54K
build.manufacturer: acer
build.model: B1-A71
build.product: B1-A71_ww_gen1
build.radio: unknown
build.serial: 31108826315
build.tags: release-keys
build.time: 1361327270000
build.type: user
build.user: root
version.codename: REL
version.incremental: eng.root.1361327219
version.release: 4.1.2
version.sdk_int: 16

11-10 11:42:14.727 E/AndroidRuntime(32280): FATAL EXCEPTION: main
11-10 11:42:14.727 E/AndroidRuntime(32280): java.lang.IllegalStateException
11-10 11:42:14.727 E/AndroidRuntime(32280):     at android.media.MediaPlayer._reset(Native Method)
11-10 11:42:14.727 E/AndroidRuntime(32280):     at android.media.MediaPlayer.reset(MediaPlayer.java:1336)
11-10 11:42:14.727 E/AndroidRuntime(32280):     at ru.vspr.FeatherPlayerActivity.loadMusic(FeatherPlayerActivity.java:332)
11-10 11:42:14.727 E/AndroidRuntime(32280):     at ru.vspr.FeatherPlayerActivity.loadTrack(FeatherPlayerActivity.java:321)
11-10 11:42:14.727 E/AndroidRuntime(32280):     at ru.vspr.FeatherPlayerActivity.initialize(FeatherPlayerActivity.java:185)
11-10 11:42:14.727 E/AndroidRuntime(32280):     at ru.vspr.FeatherPlayerActivity.access$1000002(FeatherPlayerActivity.java)
11-10 11:42:14.727 E/AndroidRuntime(32280):     at ru.vspr.FeatherPlayerActivity$100000000.onServiceConnected(FeatherPlayerActivity.java:72)
11-10 11:42:14.727 E/AndroidRuntime(32280):     at android.app.LoadedApk$ServiceDispatcher.doConnected(LoadedApk.java:1127)
11-10 11:42:14.727 E/AndroidRuntime(32280):     at android.app.LoadedApk$ServiceDispatcher$RunConnection.run(LoadedApk.java:1144)
11-10 11:42:14.727 E/AndroidRuntime(32280):     at android.os.Handler.handleCallback(Handler.java:615)
11-10 11:42:14.727 E/AndroidRuntime(32280):     at android.os.Handler.dispatchMessage(Handler.java:92)
11-10 11:42:14.727 E/AndroidRuntime(32280):     at android.os.Looper.loop(Looper.java:153)
11-10 11:42:14.727 E/AndroidRuntime(32280):     at android.app.ActivityThread.main(ActivityThread.java:4987)
11-10 11:42:14.727 E/AndroidRuntime(32280):     at java.lang.reflect.Method.invokeNative(Native Method)
11-10 11:42:14.727 E/AndroidRuntime(32280):     at java.lang.reflect.Method.invoke(Method.java:511)
11-10 11:42:14.727 E/AndroidRuntime(32280):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:821)
11-10 11:42:14.727 E/AndroidRuntime(32280):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:584)
11-10 11:42:14.727 E/AndroidRuntime(32280):     at dalvik.system.NativeStart.main(Native Method)