Android应用程序在模拟器中运行良好，但在真实设备中运行不正常？

我正在制作一个简单的音乐播放器应用程序。它已经在我的模拟器上运行得很好了，但在我把它安装到我的设备上之后，它会 “应用程序

MusicShare

（进程com.example.MusicShare）意外停止。请重试”

我的设备是Galaxy S2，我从bin文件夹中获取了apk。我已尝试使用“导出时不使用未签名密钥，因此无法安装它。以下是清单：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.musicshare"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".AndroidBuildingMusicPlayerActivity"
            android:label="@string/app_name"
            android:configChanges="keyboardHidden|orientation">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
 
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
 
        <activity
            android:name=".PlayListActivity" />
    </application>

</manifest>

---

@Pleerock是正确的。显然是路径有问题。它应该是“/sdcard/media/audio/Music/”。感谢您的帮助。

有时您需要导出整个项目并获取.apk文件并安装它

通过USB插入并获取崩溃的日志。这将引导您（或我们）方向正确。您是否可以尝试通过USB插入手机并使用手机运行应用程序（将您的设备设置为目标）。然后在启动应用程序（并崩溃）后，您的logcat区域将出现日志。请发布这些消息（通常为红色，指示错误），以便进行分析。检查您的数据，可能他找不到emulator上存在但手机上不存在的目录或媒体文件播放歌曲中的阵列可能为空。该阵列列表包含哪些内容？应该是歌曲。我已将路径设置为“/sdcard/”（因为在emulator中，它应该是“/mnt/sdcard/”），但仍然不起作用。

11-05 17:31:17.705: D/dalvikvm(6222): GC_EXTERNAL_ALLOC freed 44K, 53% free 2551K/5379K, external 0K/0K, paused 23ms
11-05 17:31:17.760: D/dalvikvm(6222): GC_EXTERNAL_ALLOC freed 11K, 53% free 2575K/5379K, external 466K/518K, paused 28ms
11-05 17:31:17.790: D/AndroidRuntime(6222): Shutting down VM
11-05 17:31:17.790: W/dalvikvm(6222): threadid=1: thread exiting with uncaught exception (group=0x4001e578)
11-05 17:31:17.795: E/AndroidRuntime(6222): FATAL EXCEPTION: main
11-05 17:31:17.795: E/AndroidRuntime(6222): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.musicshare/com.example.musicshare.AndroidBuildingMusicPlayerActivity}: java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
11-05 17:31:17.795: E/AndroidRuntime(6222):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651)
11-05 17:31:17.795: E/AndroidRuntime(6222):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
11-05 17:31:17.795: E/AndroidRuntime(6222):     at android.app.ActivityThread.access$1500(ActivityThread.java:117)
11-05 17:31:17.795: E/AndroidRuntime(6222):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
11-05 17:31:17.795: E/AndroidRuntime(6222):     at android.os.Handler.dispatchMessage(Handler.java:99)
11-05 17:31:17.795: E/AndroidRuntime(6222):     at android.os.Looper.loop(Looper.java:123)
11-05 17:31:17.795: E/AndroidRuntime(6222):     at android.app.ActivityThread.main(ActivityThread.java:3691)
11-05 17:31:17.795: E/AndroidRuntime(6222):     at java.lang.reflect.Method.invokeNative(Native Method)
11-05 17:31:17.795: E/AndroidRuntime(6222):     at java.lang.reflect.Method.invoke(Method.java:507)
11-05 17:31:17.795: E/AndroidRuntime(6222):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847)
11-05 17:31:17.795: E/AndroidRuntime(6222):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
11-05 17:31:17.795: E/AndroidRuntime(6222):     at dalvik.system.NativeStart.main(Native Method)
11-05 17:31:17.795: E/AndroidRuntime(6222): Caused by: java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
11-05 17:31:17.795: E/AndroidRuntime(6222):     at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:257)
11-05 17:31:17.795: E/AndroidRuntime(6222):     at java.util.ArrayList.get(ArrayList.java:311)
11-05 17:31:17.795: E/AndroidRuntime(6222):     at com.example.musicshare.AndroidBuildingMusicPlayerActivity.playSong(AndroidBuildingMusicPlayerActivity.java:273)
11-05 17:31:17.795: E/AndroidRuntime(6222):     at com.example.musicshare.AndroidBuildingMusicPlayerActivity.onCreate(AndroidBuildingMusicPlayerActivity.java:80)
11-05 17:31:17.795: E/AndroidRuntime(6222):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
11-05 17:31:17.795: E/AndroidRuntime(6222):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)
11-05 17:31:17.795: E/AndroidRuntime(6222):     ... 11 more