几个小时前我问过this question我已经根据堆栈溢出用户的建议对我的代码进行了一些更改。然而，又出现了一个问题。问题在于，无论何时，我都会尝试从第二个屏幕返回主屏幕。第二个屏幕的音乐不会停止。
[“我正在尝试设计主屏幕上有3个按钮的应用程序;当用户按下前两个按钮时，它会播放原始文件夹中的不同音乐。主屏幕上的第三个按钮应该会驱动用户到下一个屏幕也有2个按钮。
我试图在模拟器上运行我的应用程序。它在主屏幕的前两个按钮上播放音乐，当我点击第三个（下一个）按钮时，它将用户带到下一个屏幕。但是，当我点击第二个屏幕的第一个或第二个按钮时。它说“不幸的是你的应用已停止”。我现在不知道我的SecondActivity.Java代码有什么问题。
任何帮助将不胜感激。下面是我的主要和第二类JAVA代码。我确实在manifest.xml文件中声明了我的第二个Activity。“]
第二个Activity.Java
import android.app.Activity;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
public class SecondActivity extends Activity implements OnClickListener {
private MediaPlayer mp;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
setVolumeControlStream(AudioManager.STREAM_MUSIC);
findViewById(R.id.button_4).setOnClickListener(this);
findViewById(R.id.button_5).setOnClickListener(this);
}
public void onClick(View v) {
int resId = 1;
switch (v.getId()) {
case R.id.button_4: resId = R.raw.button_4; break;
case R.id.button_5: resId = R.raw.button_5; break;
}
// Release any resources from previous MediaPlayer
if (mp != null) {
mp.release();
}
// Create a new MediaPlayer to play this sound
mp = MediaPlayer.create(this, resId);
mp.start();
}
}
Logcat错误..
07-21 18:06:14.898: E/BinaryDictionaryGetter(157): Could not find a dictionary pack
07-21 18:06:22.518: E/SoundPool(89): error loading /system/media/audio/ui/Effect_Tick.ogg
07-21 18:06:22.518: E/SoundPool(89): error loading /system/media/audio/ui/Effect_Tick.ogg
07-21 18:06:22.518: E/SoundPool(89): error loading /system/media/audio/ui/Effect_Tick.ogg
07-21 18:06:22.518: E/SoundPool(89): error loading /system/media/audio/ui/Effect_Tick.ogg
07-21 18:06:22.518: E/SoundPool(89): error loading /system/media/audio/ui/Effect_Tick.ogg
07-21 18:06:22.698: E/SoundPool(89): error loading /system/media/audio/ui/KeypressStandard.ogg
07-21 18:06:22.698: E/SoundPool(89): error loading /system/media/audio/ui/KeypressSpacebar.ogg
07-21 18:06:22.698: E/SoundPool(89): error loading /system/media/audio/ui/KeypressDelete.ogg
07-21 18:06:22.698: E/SoundPool(89): error loading /system/media/audio/ui/KeypressReturn.ogg
07-21 18:06:42.096: E/SurfaceTexture(35): [<pid_66>] dequeueBuffer: SurfaceTexture has been abandoned!
07-21 18:06:47.276: E/ActivityManager(89): ANR in com.android.settings
07-21 18:06:47.276: E/ActivityManager(89): Reason: Broadcast of Intent { act=android.location.PROVIDERS_CHANGED flg=0x10 cmp=com.android.settings/.widget.SettingsAppWidgetProvider }
07-21 18:06:47.276: E/ActivityManager(89): Load: 6.43 / 1.85 / 0.64
07-21 18:06:47.276: E/ActivityManager(89): CPU usage from 47ms to 23826ms later:
07-21 18:06:47.276: E/ActivityManager(89): 30% 35/surfaceflinger: 27% user + 2.6% kernel / faults: 1542 minor
07-21 18:06:47.276: E/ActivityManager(89): 21% 89/system_server: 15% user + 5.2% kernel / faults: 2206 minor 1 major
07-21 18:06:47.276: E/ActivityManager(89): 16% 44/adbd: 2% user + 14% kernel / faults: 32 minor
07-21 18:06:47.276: E/ActivityManager(89): 7.2% 143/com.android.systemui: 5.4% user + 1.7% kernel / faults: 3963 minor 3 major
07-21 18:06:47.276: E/ActivityManager(89): 7.1% 191/com.android.launcher: 6.3% user + 0.8% kernel / faults: 834 minor 2 major
07-21 18:06:47.276: E/ActivityManager(89): 4.6% 176/zygote: 3.4% user + 1.2% kernel / faults: 610 minor 2 major
07-21 18:06:47.276: E/ActivityManager(89): 4.4% 231/android.process.acore: 3.5% user + 0.9% kernel / faults: 2025 minor 1 major
07-21 18:06:47.276: E/ActivityManager(89): 0.3% 212/com.android.settings: 0% user + 0.2% kernel / faults: 377 minor
07-21 18:06:47.276: E/ActivityManager(89): 0.1% 37/mediaserver: 0% user + 0% kernel / faults: 6 minor
07-21 18:06:47.276: E/ActivityManager(89): 0.1% 29/servicemanager: 0% user + 0.1% kernel
07-21 18:06:47.276: E/ActivityManager(89): 0% 34/rild: 0% user + 0% kernel / faults: 2 minor
07-21 18:06:47.276: E/ActivityManager(89): +0% 257/sh: 0% user + 0% kernel
07-21 18:06:47.276: E/ActivityManager(89): +0% 260/logcat: 0% user + 0% kernel
07-21 18:06:47.276: E/ActivityManager(89): 100% TOTAL: 70% user + 27% kernel + 0.2% irq + 1.9% softirq
07-21 18:06:47.276: E/ActivityManager(89): CPU usage from 21060ms to 22770ms later:
07-21 18:06:47.276: E/ActivityManager(89): 36% 89/system_server: 22% user + 13% kernel / faults: 236 minor
07-21 18:06:47.276: E/ActivityManager(89): 8.8% 104/ActivityManager: 3.6% user + 5.1% kernel
07-21 18:06:47.276: E/ActivityManager(89): 8% 255/Error dump: sys: 5.8% user + 2.2% kernel
07-21 18:06:47.276: E/ActivityManager(89): 6.6% 96/Compiler: 5.1% user + 1.4% kernel
07-21 18:06:47.276: E/ActivityManager(89): 2.2% 118/WindowManagerPo: 2.2% user + 0% kernel
07-21 18:06:47.276: E/ActivityManager(89): 1.4% 265/Binder Thread #: 0.7% user + 0.7% kernel
07-21 18:06:47.276: E/ActivityManager(89): 0.7% 264/Binder Thread #: 0% user + 0.7% kernel
07-21 18:06:47.276: E/ActivityManager(89): 29% 35/surfaceflinger: 26% user + 3.5% kernel / faults: 383 minor
07-21 18:06:47.276: E/ActivityManager(89): 26% 63/SurfaceFlinger: 23% user + 3.5% kernel
07-21 18:06:47.276: E/ActivityManager(89): 0.7% 254/Binder Thread #: 0% user + 0.7% kernel
07-21 18:06:47.276: E/ActivityManager(89): 25% 44/adbd: 2.2% user + 23% kernel
07-21 18:06:47.276: E/ActivityManager(89): 9.1% 44/adbd: 0% user + 9.1% kernel
07-21 18:06:47.276: E/ActivityManager(89): 9.1% 79/adbd: 3.8% user + 5.3% kernel
07-21 18:06:47.276: E/ActivityManager(89): 9.1% 249/adbd: 0% user + 9.1% kernel
07-21 18:06:47.276: E/ActivityManager(89): 8.3% 78/adbd: 0% user + 8.3% kernel
07-21 18:06:47.276: E/ActivityManager(89): 9.5% 143/com.android.systemui: 3.9% user + 5.5% kernel / faults: 403 minor
07-21 18:06:47.276: E/ActivityManager(89): 7.9% 143/ndroid.systemui: 3.1% user + 4.7% kernel
07-21 18:06:47.276: E/ActivityManager(89): 1.5% 150/Compiler: 1.5% user + 0% kernel
07-21 18:06:47.276: E/ActivityManager(89): 2.6% 191/com.android.launcher: 1.7% user + 0.8% kernel / faults: 47 minor
07-21 18:06:47.276: E/ActivityManager(89): 2.6% 191/ndroid.launcher: 1.7% user + 0.8% kernel
07-21 18:06:47.276: E/ActivityManager(89): 0.8% 203/Compiler: 0.8% user + 0% kernel
07-21 18:06:47.276: E/ActivityManager(89): 0.8% 229/launcher-loader: 0.8% user + 0% kernel
07-21 18:06:47.276: E/ActivityManager(89): 0.8% 212/com.android.settings: 0.8% user + 0% kernel / faults: 3 minor
07-21 18:06:47.276: E/ActivityManager(89): 100% TOTAL: 56% user + 41% kernel + 1.7% softirq
07-21 18:07:00.696: A/NetworkStats(89): problem reading network stats
07-21 18:07:00.696: A/NetworkStats(89): java.lang.IllegalStateException: problem parsing line: null
07-21 18:07:00.696: A/NetworkStats(89): at com.android.internal.net.NetworkStatsFactory.readNetworkStatsDetail(NetworkStatsFactory.java:313)
07-21 18:07:00.696: A/NetworkStats(89): at com.android.server.NetworkManagementService.getNetworkStatsUidDetail(NetworkManagementService.java:1271)
07-21 18:07:00.696: A/NetworkStats(89): at com.android.server.net.NetworkStatsService.performPollLocked(NetworkStatsService.java:810)
07-21 18:07:00.696: A/NetworkStats(89): at com.android.server.net.NetworkStatsService.updateIfacesLocked(NetworkStatsService.java:721)
07-21 18:07:00.696: A/NetworkStats(89): at com.android.server.net.NetworkStatsService.updateIfaces(NetworkStatsService.java:699)
07-21 18:07:00.696: A/NetworkStats(89): at com.android.server.net.NetworkStatsService.access$000(NetworkStatsService.java:128)
07-21 18:07:00.696: A/NetworkStats(89): at com.android.server.net.NetworkStatsService$8.handleMessage(NetworkStatsService.java:1546)
07-21 18:07:00.696: A/NetworkStats(89): at android.os.Handler.dispatchMessage(Handler.java:95)
07-21 18:07:00.696: A/NetworkStats(89): at android.os.Looper.loop(Looper.java:137)
07-21 18:07:00.696: A/NetworkStats(89): at android.os.HandlerThread.run(HandlerThread.java:60)
07-21 18:07:00.696: A/NetworkStats(89): Caused by: java.io.FileNotFoundException: /proc/net/xt_qtaguid/stats: open failed: ENOENT (No such file or directory)
07-21 18:07:00.696: A/NetworkStats(89): at libcore.io.IoBridge.open(IoBridge.java:406)
07-21 18:07:00.696: A/NetworkStats(89): at java.io.FileInputStream.<init>(FileInputStream.java:78)
07-21 18:07:00.696: A/NetworkStats(89): at java.io.FileReader.<init>(FileReader.java:42)
07-21 18:07:00.696: A/NetworkStats(89): at com.android.internal.net.NetworkStatsFactory.readNetworkStatsDetail(NetworkStatsFactory.java:272)
07-21 18:07:00.696: A/NetworkStats(89): ... 9 more
07-21 18:07:00.696: A/NetworkStats(89): Caused by: libcore.io.ErrnoException: open failed: ENOENT (No such file or directory)
07-21 18:07:00.696: A/NetworkStats(89): at libcore.io.Posix.open(Native Method)
07-21 18:07:00.696: A/NetworkStats(89): at libcore.io.BlockGuardOs.open(BlockGuardOs.java:98)
07-21 18:07:00.696: A/NetworkStats(89): at libcore.io.IoBridge.open(IoBridge.java:390)
07-21 18:07:00.696: A/NetworkStats(89): ... 12 more
07-21 18:07:14.576: E/ActivityManager(89): Start proc android.process.media for content provider com.android.providers.downloads/.DownloadProvider: pid=317 uid=10008 gids={1015, 1023, 1024, 1006, 2001, 3003, 3007}Load: 8.1 / 2.6 / 0.92
07-21 18:07:14.576: E/ActivityManager(89): CPU usage from 574ms to -15561ms ago:
07-21 18:07:14.576: E/ActivityManager(89): 34% 44/adbd: 6.1% user + 28% kernel
07-21 18:07:14.576: E/ActivityManager(89): 28% 89/system_server: 21% user + 7.6% kernel / faults: 1350 minor
07-21 18:07:14.576: E/ActivityManager(89): 7.8% 272/com.android.contacts: 5.2% user + 2.6% kernel / faults: 3192 minor 16 major
07-21 18:07:14.576: E/ActivityManager(89): 7.1% 176/zygote: 5.2% user + 1.9% kernel / faults: 674 minor
07-21 18:07:14.576: E/ActivityManager(89): 4.3% 231/android.process.acore: 3.8% user + 0.4% kernel / faults: 213 minor
07-21 18:07:14.576: E/ActivityManager(89): 3% 36/zygote: 2.6% user + 0.3% kernel / faults: 349 minor
07-21 18:07:14.576: E/ActivityManager(89): 0.9% 143/com.android.systemui: 0.7% user + 0.1% kernel / faults: 70 minor
07-21 18:07:14.576: E/ActivityManager(89): 0.4% 157/com.android.inputmethod.latin: 0.3% user + 0% kernel / faults: 373 minor
07-21 18:07:14.576: E/ActivityManager(89): 0.1% 260/logcat: 0% user + 0.1% kernel
07-21 18:07:14.576: E/ActivityManager(89): 0.1% 29/servicemanager: 0% user + 0.1% kernel
07-21 18:07:14.576: E/ActivityManager(89): 0.1% 34/rild: 0% user + 0.1% kernel
07-21 18:07:14.576: E/ActivityManager(89): 0% 1//init: 0% user + 0% kernel
07-21 18:07:14.576: E/ActivityManager(89): 0% 35/surfaceflinger: 0% user + 0% kernel / faults: 9 minor
07-21 18:07:14.576: E/ActivityManager(89): +0% 304/com.android.providers.calendar: 0% user + 0% kernel
07-21 18:07:14.576: E/ActivityManager(89): +0% 317/android.process.media: 0% user + 0% kernel
07-21 18:07:14.576: E/ActivityManager(89): 100% TOTAL: 53% user + 41% kernel + 0.5% irq + 4.6% softirq
07-21 18:07:14.576: E/ActivityManager(89): CPU usage from 12740ms to 14418ms later with 102% awake:
07-21 18:07:14.576: E/ActivityManager(89): 38% 44/adbd: 10% user + 28% kernel
07-21 18:07:14.576: E/ActivityManager(89): 11% 44/adbd: 3.7% user + 8.1% kernel
07-21 18:07:14.576: E/ActivityManager(89): 11% 78/adbd: 4.3% user + 6.8% kernel
07-21 18:07:14.576: E/ActivityManager(89): 11% 79/adbd: 4.3% user + 6.8% kernel
07-21 18:07:14.576: E/ActivityManager(89): 11% 249/adbd: 0% user + 11% kernel
07-21 18:07:14.576: E/ActivityManager(89): 32% 89/system_server: 26% user + 6.1% kernel / faults: 40 minor
07-21 18:07:14.576: E/ActivityManager(89): 12% 104/ActivityManager: 8.5% user + 3.6% kernel
07-21 18:07:14.576: E/ActivityManager(89): 12% 287/Binder Thread #: 12% user + 0% kernel
07-21 18:07:14.576: E/ActivityManager(89): 3% 91/GC: 1.8% user + 1.2% kernel
07-21 18:07:14.576: E/ActivityManager(89): 0.6% 96/Compiler: 0.6% user + 0% kernel
07-21 18:07:14.576: E/ActivityManager(89): 0.6% 102/SensorService: 0% user + 0.6% kernel
07-21 18:07:14.576: E/ActivityManager(89): 0.6% 121/er$SensorThread: 0.6% user + 0% kernel
07-21 18:07:14.576: E/ActivityManager(89): 0.6% 264/Binder Thread #: 0.6% user + 0% kernel
07-21 18:07:14.576: E/ActivityManager(89): 13% 36/zygote: 13% user + 0% kernel / faults: 47 minor
07-21 18:07:14.576: E/ActivityManager(89): 10% 36/zygote: 10% user + 0% kernel
07-21 18:07:14.576: E/ActivityManager(89): 8.5% 304/com.android.providers.calendar: 6.2% user + 2.3% kernel / faults: 103 minor
07-21 18:07:14.576: E/ActivityManager(89): 6.2% 304/viders.calendar: 4.6% user + 1.5% kernel
07-21 18:07:14.576: E/ActivityManager(89): 3.1% 311/Compiler: 1.5% user + 1.5% kernel
07-21 18:07:14.576: E/ActivityManager(89): 0.7% 231/android.process.acore: 0% user + 0.7% kernel / faults: 2 minor
07-21 18:07:14.576: E/ActivityManager(89): 0.7% 285/ContactsProvide: 0.7% user + 0% kernel
07-21 18:07:14.576: E/ActivityManager(89): 0.7% 317/<pre-initialized>: 0.7% user + 0% kernel / faults: 33 minor
07-21 18:07:14.576: E/ActivityManager(89): 100% TOTAL: 60% user + 34% kernel + 4.9% softirq
07-21 18:07:16.376: E/DefaultVoicemailNotifier(272): No voicemails to notify about: clear the notification.
07-21 18:07:23.277: A/NetworkStats(89): problem reading network stats
07-21 18:07:23.277: A/NetworkStats(89): java.lang.IllegalStateException: problem parsing line: null
07-21 18:07:23.277: A/NetworkStats(89): at com.android.internal.net.NetworkStatsFactory.readNetworkStatsDetail(NetworkStatsFactory.java:313)
07-21 18:07:23.277: A/NetworkStats(89): at com.android.server.NetworkManagementService.getNetworkStatsUidDetail(NetworkManagementService.java:1271)
07-21 18:07:23.277: A/NetworkStats(89): at com.android.server.net.NetworkStatsService.performPollLocked(NetworkStatsService.java:810)
07-21 18:07:23.277: A/NetworkStats(89): at com.android.server.net.NetworkStatsService.updateIfacesLocked(NetworkStatsService.java:721)
07-21 18:07:23.277: A/NetworkStats(89): at com.android.server.net.NetworkStatsService.updateIfaces(NetworkStatsService.java:699)
07-21 18:07:23.277: A/NetworkStats(89): at com.android.server.net.NetworkStatsService.access$000(NetworkStatsService.java:128)
07-21 18:07:23.277: A/NetworkStats(89): at com.android.server.net.NetworkStatsService$1.onReceive(NetworkStatsService.java:589)
07-21 18:07:23.277: A/NetworkStats(89): at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:728)
07-21 18:07:23.277: A/NetworkStats(89): at android.os.Handler.handleCallback(Handler.java:605)
07-21 18:07:23.277: A/NetworkStats(89): at android.os.Handler.dispatchMessage(Handler.java:92)
07-21 18:07:23.277: A/NetworkStats(89): at android.os.Looper.loop(Looper.java:137)
07-21 18:07:23.277: A/NetworkStats(89): at android.os.HandlerThread.run(HandlerThread.java:60)
07-21 18:07:23.277: A/NetworkStats(89): Caused by: java.io.FileNotFoundException: /proc/net/xt_qtaguid/stats: open failed: ENOENT (No such file or directory)
07-21 18:07:23.277: A/NetworkStats(89): at libcore.io.IoBridge.open(IoBridge.java:406)
07-21 18:07:23.277: A/NetworkStats(89): at java.io.FileInputStream.<init>(FileInputStream.java:78)
07-21 18:07:23.277: A/NetworkStats(89): at java.io.FileReader.<init>(FileReader.java:42)
07-21 18:07:23.277: A/NetworkStats(89): at com.android.internal.net.NetworkStatsFactory.readNetworkStatsDetail(NetworkStatsFactory.java:272)
07-21 18:07:23.277: A/NetworkStats(89): ... 11 more
07-21 18:07:23.277: A/NetworkStats(89): Caused by: libcore.io.ErrnoException: open failed: ENOENT (No such file or directory)
07-21 18:07:23.277: A/NetworkStats(89): at libcore.io.Posix.open(Native Method)
07-21 18:07:23.277: A/NetworkStats(89): at libcore.io.BlockGuardOs.open(BlockGuardOs.java:98)
07-21 18:07:23.277: A/NetworkStats(89): at libcore.io.IoBridge.open(IoBridge.java:390)
07-21 18:07:23.277: A/NetworkStats(89): ... 14 more
07-21 18:07:28.996: E/ActivityThread(358): Failed to find provider info for com.android.inputmethod.latin.dictionarypack
07-21 18:07:29.116: E/BinaryDictionaryGetter(358): Could not find a dictionary pack
07-21 18:07:49.386: E/ActivityManager(89): Start proc com.android.defcontainer for service com.android.defcontainer/.DefaultContainerService: pid=476 uid=10025 gids={1015, 2001}Load: 12.23 / 4.22 / 1.52
07-21 18:07:49.386: E/ActivityManager(89): CPU usage from 1ms to 6936ms later:
07-21 18:07:49.386: E/ActivityManager(89): 32% 89/system_server: 20% user + 11% kernel / faults: 528 minor 1 major
07-21 18:07:49.386: E/ActivityManager(89): 20% 348/procrank: 7.2% user + 13% kernel / faults: 17 minor
07-21 18:07:49.386: E/ActivityManager(89): 19% 445/app_process: 16% user + 2.4% kernel / faults: 1896 minor 1 major
07-21 18:07:49.386: E/ActivityManager(89): 2% 402/com.android.email: 1.4% user + 0.5% kernel / faults: 50 minor
07-21 18:07:49.386: E/ActivityManager(89): 1.2% 44/adbd: 0% user + 1.2% kernel / faults: 1 minor
07-21 18:07:49.386: E/ActivityManager(89): 1.2% 143/com.android.systemui: 0.8% user + 0.4% kernel / faults: 33 minor
07-21 18:07:49.386: E/ActivityManager(89): 1.1% 176/zygote: 0.4% user + 0.7% kernel / faults: 64 minor
07-21 18:07:49.386: E/ActivityManager(89): 0.7% 36/zygote: 0.1% user + 0.5% kernel / faults: 150 minor
07-21 18:07:49.386: E/ActivityManager(89): 0.7% 317/android.process.media: 0.4% user + 0.2% kernel / faults: 56 minor
07-21 18:07:49.386: E/ActivityManager(89): 0.1% 260/logcat: 0% user + 0.1% kernel
07-21 18:07:49.386: E/ActivityManager(89): 0.1% 304/com.android.providers.calendar: 0.1% user + 0% kernel / faults: 14 minor
07-21 18:07:49.386: E/ActivityManager(89): 0% 35/surfaceflinger: 0% user + 0% kernel
07-21 18:07:49.386: E/ActivityManager(89): 0% 231/android.process.acore: 0% user + 0% kernel / faults: 11 minor
07-21 18:07:49.386: E/ActivityManager(89): 0% 334/com.android.deskclock: 0% user + 0% kernel / faults: 50 minor
07-21 18:07:49.386: E/ActivityManager(89): 0% 374/com.android.mms: 0% user + 0% kernel / faults: 4 minor
07-21 18:07:49.386: E/ActivityManager(89): 0.1% 425/com.android.exchange: 0.1% user + 0% kernel / faults: 12 minor
07-21 18:07:49.386: E/ActivityManager(89): +0% 461/com.android.settings: 0% user + 0% kernel
07-21 18:07:49.386: E/ActivityManager(89): +0% 476/com.android.defcontainer: 0% user + 0% kernel
07-21 18:07:49.386: E/ActivityManager(89): 0.-1% 272/com.android.contacts: 0.-1% user + 0% kernel
07-21 18:07:49.386: E/ActivityManager(89): 100% TOTAL: 60% user + 39% kernel + 0.1% softirq
07-21 18:07:49.386: E/ActivityManager(89): CPU usage from 5260ms to 6361ms later:
07-21 18:07:49.386: E/ActivityManager(89): 23% 461/com.android.settings: 7.2% user + 16% kernel / faults: 1888 minor
07-21 18:07:49.386: E/ActivityManager(89): 19% 461/ndroid.settings: 5.2% user + 14% kernel
07-21 18:07:49.386: E/ActivityManager(89): 21% 89/system_server: 8.6% user + 12% kernel / faults: 11 minor
07-21 18:07:49.386: E/ActivityManager(89): 20% 114/ScreenOffThread: 0% user + 20% kernel
07-21 18:07:49.386: E/ActivityManager(89): 13% 104/ActivityManager: 8.6% user + 4.8% kernel
07-21 18:07:49.386: E/ActivityManager(89): 0.9% 89/system_server: 0.9% user + 0% kernel
07-21 18:07:49.386: E/ActivityManager(89): 0.9% 96/Compiler: 0% user + 0.9% kernel
07-21 18:07:49.386: E/ActivityManager(89): 21% 348/procrank: 7.2% user + 14% kernel / faults: 2 minor
07-21 18:07:49.386: E/ActivityManager(89): 11% 445/app_process: 11% user + 0% kernel / faults: 126 minor
07-21 18:07:49.386: E/ActivityManager(89): 10% 445/app_process: 10% user + 0% kernel
07-21 18:07:49.386: E/ActivityManager(89): 3.1% 457/Compiler: 3.1% user + 0% kernel
07-21 18:07:49.386: E/ActivityManager(89): +0% 474/Binder Thread #: 0% user + 0% kernel
07-21 18:07:49.386: E/ActivityManager(89): +0% 475/Binder Thread #: 0% user + 0% kernel
07-21 18:07:49.386: E/ActivityManager(89): 4.3% 143/com.android.systemui: 4.3% user + 0% kernel / faults: 9 minor
07-21 18:07:49.386: E/ActivityManager(89): 3.2% 143/ndroid.systemui: 3.2% user + 0% kernel
07-21 18:07:49.386: E/ActivityManager(89): 0.9% 44/adbd: 0% user + 0.9% kernel
07-21 18:07:49.386: E/ActivityManager(89): 0.9% 44/adbd: 0% user + 0.9% kernel
07-21 18:07:49.386: E/ActivityManager(89): 1.1% 176/com.android.phone: 0% user + 1.1% kernel / faults: 12 minor
07-21 18:07:49.386: E/ActivityManager(89): 0.3% 304/com.android.providers.calendar: 0.3% user + 0% kernel / faults: 8 minor
07-21 18:07:49.386: E/ActivityManager(89): 0.3% 311/Compiler: 0% user + 0.3% kernel
07-21 18:07:49.386: E/ActivityManager(89): 100% TOTAL: 57% user + 42% kernel
: E/(): Device disconnected
答案 0 :(得分：0)
在此阶段，您应该了解活动生命周期：
如果您想要离开某个活动，并且在这种情况下您想要停止音乐，则必须实施onPause()方法。当你的活动即将离开你的用户界面，并且想要停止播放所有声音时，你应该在你的所有活动中使用mediaPlayer 这样做：
@Override
public void onPause() {
super.onPause(); // Always call the superclass method first
// Release any resources from previous MediaPlayer
if (mp != null) {
mp.release();
}
}