实际上我试图通过点击图片按钮关闭这个应用程序，但是当我为应用程序关闭添加代码时，它会在启动之前崩溃应用程序。这是我的代码。我已经在创建mothod上创建了应用程序密码。
public class Alphabets extends Activity {
MediaPlayer mp;
MediaPlayer BG;
ImageButton exit;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_numbers);
ViewPagerAdapter adapter = new ViewPagerAdapter(this, imageArra);
ViewPager myPager = (ViewPager) findViewById(R.id.myfivepanelpager);
myPager.setOnPageChangeListener(player);
myPager.setAdapter(adapter);
myPager.setCurrentItem(0);
BG = MediaPlayer.create(this, R.raw.jingle);
BG.setLooping(true);
BG.setVolume(100, 100);
BG.start();
mp = MediaPlayer.create(Alphabets.this, mAudio[0]);
mp.start();
exit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View paramView)
{
finish();
moveTaskToBack(true);
}
});
}
@Override
protected void onPause() {
super.onPause();
BG.pause();
}
@Override
protected void onResume() {
super.onResume();
BG.start();
}
private int[] mAudio = new int[]{R.raw.one,R.raw.one,R.raw.one,R.raw.one,R.raw.one,R.raw.one,R.raw.one,R.raw.one,R.raw.one,R.raw.one,R.raw.one,R.raw.one,R.raw.one,
R.raw.one,R.raw.one,R.raw.one,R.raw.one,R.raw.one,R.raw.one,R.raw.one,R.raw.one,R.raw.one,R.raw.one,R.raw.one,R.raw.one,R.raw.one,};
private int imageArra[] = {R.drawable.ab,R.drawable.bc,R.drawable.cd,R.drawable.de,R.drawable.ef,R.drawable.fg,R.drawable.gh,R.drawable.hi,R.drawable.ij,R.drawable.jk,R.drawable.kl,R.drawable.lm,R.drawable.mn,
R.drawable.no,R.drawable.op,R.drawable.pq,R.drawable.qr,R.drawable.rs,R.drawable.st,R.drawable.tu,R.drawable.uv,R.drawable.vw,R.drawable.wx,R.drawable.xy,R.drawable.yz,R.drawable.zz};
public OnPageChangeListener player = new OnPageChangeListener()
{
@Override
public void onPageSelected(int arg1)
{
mp = MediaPlayer.create(Alphabets.this, mAudio[arg1]);
mp.stop();
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2)
{
}
@Override
public void onPageScrollStateChanged(int arg0)
{
}
};
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.numbers, menu);
return true;
}
}
布局： -
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/image2"
android:gravity="center"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".Alphabets" >
<android.support.v4.view.ViewPager
android:id="@+id/myfivepanelpager"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<ImageButton
android:id="@+id/exit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/myfivepanelpager"
android:layout_alignLeft="@+id/myfivepanelpager"
android:layout_marginBottom="170dp"
android:src="@android:drawable/btn_star" />
</RelativeLayout>
logcat： -
01-23 05:10:01.951: D/dalvikvm(1767): Not late-enabling CheckJNI (already on)
01-23 05:10:03.381: D/dalvikvm(1767): GC_FOR_ALLOC freed 68K, 8% free 2495K/2692K, paused 109ms, total 114ms
01-23 05:10:03.681: I/dalvikvm-heap(1767): Grow heap (frag case) to 11.347MB for 9216012-byte allocation
01-23 05:10:03.781: D/dalvikvm(1767): GC_FOR_ALLOC freed <1K, 2% free 11494K/11696K, paused 95ms, total 95ms
01-23 05:10:08.191: D/dalvikvm(1767): GC_FOR_ALLOC freed <1K, 2% free 11494K/11696K, paused 20ms, total 20ms
01-23 05:10:08.331: I/dalvikvm-heap(1767): Grow heap (frag case) to 31.123MB for 20736012-byte allocation
01-23 05:10:08.361: I/dalvikvm-heap(1767): Clamp target GC heap from 33.123MB to 32.000MB
01-23 05:10:08.381: D/dalvikvm(1767): GC_FOR_ALLOC freed <1K, 1% free 31744K/31948K, paused 45ms, total 45ms
01-23 05:10:10.091: D/dalvikvm(1767): GC_FOR_ALLOC freed 9000K, 29% free 23055K/32260K, paused 26ms, total 27ms
01-23 05:10:10.461: D/libEGL(1767): loaded /system/lib/egl/libEGL_emulation.so
01-23 05:10:10.471: D/(1767): HostConnection::get() New Host Connection established 0xb8cc08f0, tid 1767
01-23 05:10:10.551: D/libEGL(1767): loaded /system/lib/egl/libGLESv1_CM_emulation.so
01-23 05:10:10.551: D/libEGL(1767): loaded /system/lib/egl/libGLESv2_emulation.so
01-23 05:10:10.721: W/EGL_emulation(1767): eglSurfaceAttrib not implemented
01-23 05:10:10.821: D/OpenGLRenderer(1767): Enabling debug mode 0
01-23 05:10:13.591: D/dalvikvm(1767): GC_FOR_ALLOC freed 519K, 26% free 23938K/32260K, paused 23ms, total 23ms
01-23 05:10:13.591: I/dalvikvm-heap(1767): Forcing collection of SoftReferences for 9216012-byte allocation
01-23 05:10:13.631: D/dalvikvm(1767): GC_BEFORE_OOM freed 10K, 26% free 23928K/32260K, paused 34ms, total 34ms
01-23 05:10:13.631: E/dalvikvm-heap(1767): Out of memory on a 9216012-byte allocation.
01-23 05:10:13.631: I/dalvikvm(1767): "main" prio=5 tid=1 RUNNABLE
01-23 05:10:13.631: I/dalvikvm(1767): | group="main" sCount=0 dsCount=0 obj=0xb2f45480 self=0xb8afe1e0
01-23 05:10:13.631: I/dalvikvm(1767): | sysTid=1767 nice=0 sched=0/0 cgrp=[fopen-error:2] handle=-1216602080
01-23 05:10:13.631: I/dalvikvm(1767): | state=R schedstat=( 0 0 0 ) utm=453 stm=90 core=0
01-23 05:10:13.651: I/dalvikvm(1767): at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
01-23 05:10:13.651: I/dalvikvm(1767): at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:503)
01-23 05:10:13.651: I/dalvikvm(1767): at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:356)
01-23 05:10:13.651: I/dalvikvm(1767): at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:800)
01-23 05:10:13.651: I/dalvikvm(1767): at android.content.res.Resources.loadDrawable(Resources.java:2105)
01-23 05:10:13.651: I/dalvikvm(1767): at android.content.res.TypedArray.getDrawable(TypedArray.java:601)
01-23 05:10:13.651: I/dalvikvm(1767): at android.view.View.<init>(View.java:3364)
01-23 05:10:13.651: I/dalvikvm(1767): at android.view.View.<init>(View.java:3293)
01-23 05:10:13.651: I/dalvikvm(1767): at android.view.ViewGroup.<init>(ViewGroup.java:453)
01-23 05:10:13.651: I/dalvikvm(1767): at android.widget.RelativeLayout.<init>(RelativeLayout.java:242)
01-23 05:10:13.651: I/dalvikvm(1767): at java.lang.reflect.Constructor.constructNative(Native Method)
01-23 05:10:13.651: I/dalvikvm(1767): at java.lang.reflect.Constructor.newInstance(Constructor.java:417)
01-23 05:10:13.651: I/dalvikvm(1767): at android.view.LayoutInflater.createView(LayoutInflater.java:594)
01-23 05:10:13.651: I/dalvikvm(1767): at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56)
01-23 05:10:13.651: I/dalvikvm(1767): at android.view.LayoutInflater.onCreateView(LayoutInflater.java:669)
01-23 05:10:13.651: I/dalvikvm(1767): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:694)
01-23 05:10:13.651: I/dalvikvm(1767): at android.view.LayoutInflater.inflate(LayoutInflater.java:469)
01-23 05:10:13.661: I/dalvikvm(1767): at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
01-23 05:10:13.661: I/dalvikvm(1767): at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
01-23 05:10:13.661: I/dalvikvm(1767): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:267)
01-23 05:10:13.661: I/dalvikvm(1767): at android.app.Activity.setContentView(Activity.java:1895)
01-23 05:10:13.661: I/dalvikvm(1767): at com.android.toddlers.Alphabets.onCreate(Alphabets.java:21)
01-23 05:10:13.661: I/dalvikvm(1767): at android.app.Activity.performCreate(Activity.java:5133)
01-23 05:10:13.661: I/dalvikvm(1767): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
01-23 05:10:13.661: I/dalvikvm(1767): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
01-23 05:10:13.661: I/dalvikvm(1767): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
01-23 05:10:13.661: I/dalvikvm(1767): at android.app.ActivityThread.access$600(ActivityThread.java:141)
01-23 05:10:13.661: I/dalvikvm(1767): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
01-23 05:10:13.661: I/dalvikvm(1767): at android.os.Handler.dispatchMessage(Handler.java:99)
01-23 05:10:13.661: I/dalvikvm(1767): at android.os.Looper.loop(Looper.java:137)
01-23 05:10:13.661: I/dalvikvm(1767): at android.app.ActivityThread.main(ActivityThread.java:5103)
01-23 05:10:13.661: I/dalvikvm(1767): at java.lang.reflect.Method.invokeNative(Native Method)
01-23 05:10:13.661: I/dalvikvm(1767): at java.lang.reflect.Method.invoke(Method.java:525)
01-23 05:10:13.661: I/dalvikvm(1767): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
01-23 05:10:13.661: I/dalvikvm(1767): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
01-23 05:10:13.661: I/dalvikvm(1767): at dalvik.system.NativeStart.main(Native Method)
01-23 05:10:13.681: D/skia(1767): --- decoder->decode returned false
01-23 05:10:13.691: D/AndroidRuntime(1767): Shutting down VM
01-23 05:10:13.691: W/dalvikvm(1767): threadid=1: thread exiting with uncaught exception (group=0xb2f44648)
01-23 05:10:13.721: E/AndroidRuntime(1767): FATAL EXCEPTION: main
01-23 05:10:13.721: E/AndroidRuntime(1767): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.toddlers/com.android.toddlers.Alphabets}: android.view.InflateException: Binary XML file line #1: Error inflating class <unknown>
01-23 05:10:13.721: E/AndroidRuntime(1767): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
01-23 05:10:13.721: E/AndroidRuntime(1767): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
01-23 05:10:13.721: E/AndroidRuntime(1767): at android.app.ActivityThread.access$600(ActivityThread.java:141)
01-23 05:10:13.721: E/AndroidRuntime(1767): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
01-23 05:10:13.721: E/AndroidRuntime(1767): at android.os.Handler.dispatchMessage(Handler.java:99)
01-23 05:10:13.721: E/AndroidRuntime(1767): at android.os.Looper.loop(Looper.java:137)
01-23 05:10:13.721: E/AndroidRuntime(1767): at android.app.ActivityThread.main(ActivityThread.java:5103)
01-23 05:10:13.721: E/AndroidRuntime(1767): at java.lang.reflect.Method.invokeNative(Native Method)
01-23 05:10:13.721: E/AndroidRuntime(1767): at java.lang.reflect.Method.invoke(Method.java:525)
01-23 05:10:13.721: E/AndroidRuntime(1767): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
01-23 05:10:13.721: E/AndroidRuntime(1767): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
01-23 05:10:13.721: E/AndroidRuntime(1767): at dalvik.system.NativeStart.main(Native Method)
01-23 05:10:13.721: E/AndroidRuntime(1767): Caused by: android.view.InflateException: Binary XML file line #1: Error inflating class <unknown>
01-23 05:10:13.721: E/AndroidRuntime(1767): at android.view.LayoutInflater.createView(LayoutInflater.java:620)
01-23 05:10:13.721: E/AndroidRuntime(1767): at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56)
01-23 05:10:13.721: E/AndroidRuntime(1767): at android.view.LayoutInflater.onCreateView(LayoutInflater.java:669)
01-23 05:10:13.721: E/AndroidRuntime(1767): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:694)
01-23 05:10:13.721: E/AndroidRuntime(1767): at android.view.LayoutInflater.inflate(LayoutInflater.java:469)
01-23 05:10:13.721: E/AndroidRuntime(1767): at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
01-23 05:10:13.721: E/AndroidRuntime(1767): at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
01-23 05:10:13.721: E/AndroidRuntime(1767): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:267)
01-23 05:10:13.721: E/AndroidRuntime(1767): at android.app.Activity.setContentView(Activity.java:1895)
01-23 05:10:13.721: E/AndroidRuntime(1767): at com.android.toddlers.Alphabets.onCreate(Alphabets.java:21)
01-23 05:10:13.721: E/AndroidRuntime(1767): at android.app.Activity.performCreate(Activity.java:5133)
01-23 05:10:13.721: E/AndroidRuntime(1767): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
01-23 05:10:13.721: E/AndroidRuntime(1767): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
01-23 05:10:13.721: E/AndroidRuntime(1767): ... 11 more
01-23 05:10:13.721: E/AndroidRuntime(1767): Caused by: java.lang.reflect.InvocationTargetException
01-23 05:10:13.721: E/AndroidRuntime(1767): at java.lang.reflect.Constructor.constructNative(Native Method)
01-23 05:10:13.721: E/AndroidRuntime(1767): at java.lang.reflect.Constructor.newInstance(Constructor.java:417)
01-23 05:10:13.721: E/AndroidRuntime(1767): at android.view.LayoutInflater.createView(LayoutInflater.java:594)
01-23 05:10:13.721: E/AndroidRuntime(1767): ... 23 more
01-23 05:10:13.721: E/AndroidRuntime(1767): Caused by: java.lang.OutOfMemoryError
01-23 05:10:13.721: E/AndroidRuntime(1767): at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
01-23 05:10:13.721: E/AndroidRuntime(1767): at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:503)
01-23 05:10:13.721: E/AndroidRuntime(1767): at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:356)
01-23 05:10:13.721: E/AndroidRuntime(1767): at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:800)
01-23 05:10:13.721: E/AndroidRuntime(1767): at android.content.res.Resources.loadDrawable(Resources.java:2105)
01-23 05:10:13.721: E/AndroidRuntime(1767): at android.content.res.TypedArray.getDrawable(TypedArray.java:601)
01-23 05:10:13.721: E/AndroidRuntime(1767): at android.view.View.<init>(View.java:3364)
01-23 05:10:13.721: E/AndroidRuntime(1767): at android.view.View.<init>(View.java:3293)
01-23 05:10:13.721: E/AndroidRuntime(1767): at android.view.ViewGroup.<init>(ViewGroup.java:453)
01-23 05:10:13.721: E/AndroidRuntime(1767): at android.widget.RelativeLayout.<init>(RelativeLayout.java:242)
01-23 05:10:13.721: E/AndroidRuntime(1767): ... 26 more
01-23 05:10:16.981: I/Process(1767): Sending signal. PID: 1767 SIG: 9
答案 0 :(得分：6)
您忘记初始化exit ImageButton。首先初始化它......
exit = (ImageButton)findViewById(R.id.id_of_image_button)
exit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View paramView) {
finish();
moveTaskToBack(true);
}
});
答案 1 :(得分：2)
您尚未初始化ImageButton中的onCreate()并关闭应用只需编写android.os.Process.killProcess(android.os.Process.myPid())即可完全终止您的应用。
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_numbers);
exit=(ImageButton)findViewById(R.id.yourid);
...............
...............
exit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View paramView)
{
android.os.Process.killProcess(android.os.Process.myPid()) ;
}
});
moveTaskToBack(boolean nonRoot)将包含此活动的任务移动到活动堆栈的后面。它不会关闭应用程序，但应用程序将在后台运行。
您可能会因为onResume()方法而导致应用程序崩溃，而您在没有初始化的情况下直接启动MediaPlayer。在onResume()之前调用onCreate()。因此，只需在MediaPlayer BG中初始化onResume()，如下所示：
@Override
protected void onResume() {
super.onResume();
BG=new MediaPlayer();
}