带有图像的 Android ViewPager:内存泄漏/应用程序崩溃 [英] Android ViewPager with images: memory leak/app crashes
本文介绍了带有图像的 Android ViewPager:内存泄漏/应用程序崩溃的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在编写一个显示全景图片的应用，该全景图片最终在其上有几个标记以显示有关某些点的信息.
I am writing an app that displays a panorama picture that eventually has several markers on it to display information about certain points.
由于大图像使应用程序崩溃(我在应用程序中还有另一个正在显示大地图的活动)，我现在尝试使用 ViewPager 将全景图显示为一系列页面.
As the large image crashed the app (I have also another activity in the app that is displaying a large map), I am now trying to display the panorama as a sequence of pages with ViewPager.
我已经设法以 6 位显示图片，我认为一切进展顺利，但现在由于内存耗尽，应用程序在几次滑动(大约 7 到 8 次)后崩溃.
I have managed to display the picture in 6 bits and I thought things were going well, but now the app crashes after a few swipes (about 7 to 8) as the memory runs out.
我很困惑，为什么我认为我的物品一旦离开屏幕就会被摧毁?我是一个绝对的菜鸟，如果我浪费了时间，我很抱歉.我整天都在阅读和尝试来自这里和其他地方的解决方案，但我并不聪明.
I am pulling my hair out as to why that is as I thought my items would get destroyed once they are off the screen?? I am an absolute noobs and I'm so sorry if I'm being a time waster. I have spent all day reading and trying out solutions from here and elsewhere and I am none the wiser.
这是我的代码:活动全景视图
here is my code: activity PanoramaView
public class PanoramaView extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.panorama);
MyPagerAdapter adapter = new MyPagerAdapter();
ViewPager myPager = (ViewPager) findViewById(R.id.mysixpanelpager);
myPager.setAdapter(adapter);
myPager.setCurrentItem(2);
}
}
MyPagerAdapter
MyPagerAdapter
public class MyPagerAdapter extends PagerAdapter {
public int getCount() {
return 6;
}
public Object instantiateItem(View collection, int position) {
LayoutInflater inflater = (LayoutInflater) collection.getContext()
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
int resId = 0;
switch (position) {
case 0:
resId = R.layout.farleft;
break;
case 1:
resId = R.layout.left;
break;
case 2:
resId = R.layout.middle;
break;
case 3:
resId = R.layout.right;
break;
case 4:
resId = R.layout.farright;
break;
case 5:
resId = R.layout.farfarright;
break;
}
//ImageView imageView = new ImageView(getApplicationContext());
//imageView.findViewById(R.id.imageView);
//imageView.setImageBitmap(BitmapFactory.decodeResource(getResources(), ids[position]));
View view = inflater.inflate(resId, null);
((ViewPager) collection).addView(view, 0);
return view;
}
@Override
public void destroyItem(View collection, int position, Object o) {
View view = (View)o;
((ViewPager) collection).removeView(view);
view = null;
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == ((View) arg1);
}
@Override
public Parcelable saveState() {
return null;
}
}
我的主布局文件
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<android.support.v4.view.ViewPager
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/mysixpanelpager"/>
</LinearLayout>
我保证从现在开始我将成为一名乐于助人的会员(或者在我真正知道自己在做什么之后更是如此).
I promise I will be a helpful member from now on (or even more so once I actually know what I'm doing).
- 在第一个活动中，我正在显示一个 552kb 的图像.- 我在此活动 (PanoramaView) 中显示的六张图像在 309 到 500kb 之间.- 我在 Eclipse 中使用了分配跟踪器，我只能看到内存已满，但我不清楚确切的数据- 显示 7 或 8 张图像后发生崩溃(基本上是在向后和第四次滑动之后)
- In the first activity, I'm displaying an image that is 552kb. - The six images that I'm displaying in this activity (PanoramaView) are between 309 and 500kb. - I have used an allocation tracker in Eclipse and all I could see was the memory filling up but the exact data wasn't clear to me - the crash happens after displaying 7 or 8 images (basically after swiping back and fourth several times)
这是 farfarright.xml 的代码
Here is the code for farfarright.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/imageView"
android:src="@drawable/panorama6"
android:adjustViewBounds="true"
android:contentDescription="@string/panorama" >
</ImageView>
</LinearLayout>
我尝试设置屏幕外页面限制，但没有帮助.
I have tried setting the off screen page limit which didn't help.
我在另一篇文章中找到了关于内存管理的 this 链接，今晚我会看看.
I found this link about memory management on another post and I'll have a look at it tonight.
这里是 LogCat 输出
here is the LogCat output
11-28 21:17:42.551: D/dalvikvm(328): GC_EXTERNAL_ALLOC freed 51K, 53% free 2558K/5379K, external 2002K/2137K, paused 65ms
11-28 21:17:43.261: D/dalvikvm(328): GC_EXTERNAL_ALLOC freed 1K, 53% free 2557K/5379K, external 3297K/4118K, paused 44ms
11-28 21:17:47.741: W/KeyCharacterMap(328): No keyboard for id 0
11-28 21:17:47.741: W/KeyCharacterMap(328): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
11-28 21:17:49.141: D/DFSAPP(328): my button id before is 2
11-28 21:17:49.691: D/dalvikvm(328): GC_EXTERNAL_ALLOC freed 36K, 52% free 2614K/5379K, external 15576K/15708K, paused 50ms
11-28 21:17:54.571: D/dalvikvm(328): GC_EXTERNAL_ALLOC freed 12K, 52% free 2616K/5379K, external 17386K/17735K, paused 39ms
11-28 21:17:54.661: D/dalvikvm(328): GC_EXTERNAL_ALLOC freed 0K, 52% free 2616K/5379K, external 17386K/17735K, paused 61ms
11-28 21:17:54.711: I/dalvikvm-heap(328): Clamp target GC heap from 25.629MB to 24.000MB
11-28 21:17:54.711: D/dalvikvm(328): GC_FOR_MALLOC freed <1K, 52% free 2616K/5379K, external 18975K/21023K, paused 42ms
11-28 21:18:03.751: D/dalvikvm(328): GC_EXTERNAL_ALLOC freed 6K, 52% free 2616K/5379K, external 18269K/20317K, paused 46ms
11-28 21:18:03.822: I/dalvikvm-heap(328): Clamp target GC heap from 25.628MB to 24.000MB
11-28 21:18:03.852: D/dalvikvm(328): GC_FOR_MALLOC freed <1K, 52% free 2615K/5379K, external 18975K/20317K, paused 32ms
11-28 21:18:04.131: D/dalvikvm(328): GC_EXTERNAL_ALLOC freed <1K, 52% free 2615K/5379K, external 17386K/19434K, paused 49ms
11-28 21:18:04.191: I/dalvikvm-heap(328): Clamp target GC heap from 25.628MB to 24.000MB
11-28 21:18:04.201: D/dalvikvm(328): GC_FOR_MALLOC freed 0K, 52% free 2615K/5379K, external 18975K/19434K, paused 34ms
11-28 21:18:07.301: D/dalvikvm(328): GC_EXTERNAL_ALLOC freed 1K, 52% free 2616K/5379K, external 18269K/19434K, paused 46ms
11-28 21:18:07.381: I/dalvikvm-heap(328): Clamp target GC heap from 25.801MB to 24.000MB
11-28 21:18:07.401: D/dalvikvm(328): GC_FOR_MALLOC freed <1K, 52% free 2616K/5379K, external 19152K/19434K, paused 38ms
11-28 21:18:07.611: D/dalvikvm(328): GC_EXTERNAL_ALLOC freed <1K, 52% free 2615K/5379K, external 18159K/19434K, paused 47ms
11-28 21:18:07.681: I/dalvikvm-heap(328): Clamp target GC heap from 25.801MB to 24.000MB
11-28 21:18:07.681: D/dalvikvm(328): GC_FOR_MALLOC freed 0K, 52% free 2615K/5379K, external 19152K/19434K, paused 36ms
11-28 21:18:18.901: D/dalvikvm(328): GC_EXTERNAL_ALLOC freed 5K, 52% free 2616K/5379K, external 18269K/19434K, paused 57ms
11-28 21:18:18.972: I/dalvikvm-heap(328): Clamp target GC heap from 25.802MB to 24.000MB
11-28 21:18:18.991: D/dalvikvm(328): GC_FOR_MALLOC freed <1K, 52% free 2616K/5379K, external 19152K/19434K, paused 33ms
11-28 21:18:19.181: D/dalvikvm(328): GC_EXTERNAL_ALLOC freed 1K, 52% free 2615K/5379K, external 18159K/19434K, paused 55ms
11-28 21:18:19.251: I/dalvikvm-heap(328): Clamp target GC heap from 25.801MB to 24.000MB
11-28 21:18:19.251: D/dalvikvm(328): GC_FOR_MALLOC freed 0K, 52% free 2615K/5379K, external 19152K/19434K, paused 33ms
11-28 21:18:21.551: D/dalvikvm(328): GC_EXTERNAL_ALLOC freed 1K, 52% free 2616K/5379K, external 18975K/19434K, paused 46ms
11-28 21:18:21.581: E/dalvikvm-heap(328): 1627200-byte external allocation too large for this process.
11-28 21:18:21.621: I/dalvikvm-heap(328): Clamp target GC heap from 25.629MB to 24.000MB
11-28 21:18:21.621: E/GraphicsJNI(328): VM won't let us allocate 1627200 bytes
11-28 21:18:21.631: D/dalvikvm(328): GC_FOR_MALLOC freed 0K, 52% free 2616K/5379K, external 18975K/19434K, paused 34ms
11-28 21:18:21.641: D/AndroidRuntime(328): Shutting down VM
11-28 21:18:21.641: W/dalvikvm(328): threadid=1: thread exiting with uncaught exception (group=0x40015560)
11-28 21:18:21.732: E/AndroidRuntime(328): FATAL EXCEPTION: main
11-28 21:18:21.732: E/AndroidRuntime(328): android.view.InflateException: Binary XML file line #7: Error inflating class <unknown>
11-28 21:18:21.732: E/AndroidRuntime(328): at android.view.LayoutInflater.createView(LayoutInflater.java:518)
11-28 21:18:21.732: E/AndroidRuntime(328): at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:568)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.view.LayoutInflater.rInflate(LayoutInflater.java:623)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.view.LayoutInflater.inflate(LayoutInflater.java:408)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
11-28 21:18:21.732: E/AndroidRuntime(328): at com.businesbike.dfp.MyPagerAdapter.instantiateItem(MyPagerAdapter.java:43)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:692)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.support.v4.view.ViewPager.populate(ViewPager.java:849)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.support.v4.view.ViewPager.populate(ViewPager.java:772)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.support.v4.view.ViewPager.completeScroll(ViewPager.java:1539)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.support.v4.view.ViewPager.computeScroll(ViewPager.java:1422)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.view.ViewGroup.drawChild(ViewGroup.java:1562)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.view.View.draw(View.java:6883)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.widget.FrameLayout.draw(FrameLayout.java:357)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.view.View.draw(View.java:6883)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.widget.FrameLayout.draw(FrameLayout.java:357)
11-28 21:18:21.732: E/AndroidRuntime(328): at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1862)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.view.ViewRoot.draw(ViewRoot.java:1522)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.view.ViewRoot.performTraversals(ViewRoot.java:1258)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.view.ViewRoot.handleMessage(ViewRoot.java:1859)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.os.Handler.dispatchMessage(Handler.java:99)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.os.Looper.loop(Looper.java:123)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.app.ActivityThread.main(ActivityThread.java:3683)
11-28 21:18:21.732: E/AndroidRuntime(328): at java.lang.reflect.Method.invokeNative(Native Method)
11-28 21:18:21.732: E/AndroidRuntime(328): at java.lang.reflect.Method.invoke(Method.java:507)
11-28 21:18:21.732: E/AndroidRuntime(328): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
11-28 21:18:21.732: E/AndroidRuntime(328): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
11-28 21:18:21.732: E/AndroidRuntime(328): at dalvik.system.NativeStart.main(Native Method)
11-28 21:18:21.732: E/AndroidRuntime(328): Caused by: java.lang.reflect.InvocationTargetException
11-28 21:18:21.732: E/AndroidRuntime(328): at java.lang.reflect.Constructor.constructNative(Native Method)
11-28 21:18:21.732: E/AndroidRuntime(328): at java.lang.reflect.Constructor.newInstance(Constructor.java:415)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.view.LayoutInflater.createView(LayoutInflater.java:505)
11-28 21:18:21.732: E/AndroidRuntime(328): ... 36 more
11-28 21:18:21.732: E/AndroidRuntime(328): Caused by: java.lang.OutOfMemoryError: bitmap size exceeds VM budget
11-28 21:18:21.732: E/AndroidRuntime(328): at android.graphics.Bitmap.nativeCreate(Native Method)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.graphics.Bitmap.createBitmap(Bitmap.java:477)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.graphics.Bitmap.createBitmap(Bitmap.java:444)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.graphics.Bitmap.createScaledBitmap(Bitmap.java:349)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.graphics.BitmapFactory.finishDecode(BitmapFactory.java:498)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:473)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:336)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:697)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.content.res.Resources.loadDrawable(Resources.java:1709)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.content.res.TypedArray.getDrawable(TypedArray.java:601)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.widget.ImageView.<init>(ImageView.java:118)
11-28 21:18:21.732: E/AndroidRuntime(328): at android.widget.ImageView.<init>(ImageView.java:108)
11-28 21:18:21.732: E/AndroidRuntime(328): ... 39 more
如果有人看到这篇文章，这里似乎已经修复了它:我已将代码更改为下面答案中的代码，并且我还将全景图片切成更小的部分，因此现在每张图片都低于 300kb.
In case someone comes across this post, here is what seems to have fixed it: I have change the code to the code from the answer below and I have also cut up my panorama picture into smaller bits so each image is now below 300kb.
推荐答案
所以用
1
@Override
public Object instantiateItem(ViewGroup collection, int position)
@Override
public void destroyItem(ViewGroup collection, int position, Object view)
而不是
public Object instantiateItem(View collection, int position)
public void destroyItem(View collection, int position, Object view)
2 测试了 6 张大小为 400k 的图片，每张都可以正常工作
2 Tested on 6 images size 400k each work fine
@Override
public Object instantiateItem(ViewGroup collection, int position)
{
LayoutInflater inflater = (LayoutInflater) collection.getContext()
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
int resId = 0;
switch (position) {
case 0:
resId = R.layout.farleft;
break;
case 1:
resId = R.layout.left;
break;
case 2:
resId = R.layout.middle;
break;
case 3:
resId = R.layout.right;
break;
case 4:
resId = R.layout.farright;
break;
case 5:
resId = R.layout.farfarright;
break;
}
View view = (View) inflater.inflate(resId, null);
//get Image view from layout
//ImageView imageView = (ImageView) view.findViewById(resId);
//imageView.setImageResource(resId);
collection.addView(view, 0);
return view;
}
@Override
public void destroyItem(ViewGroup collection, int position, Object view)
{
collection.removeView((View) view);
}
3 有用的链接 PageAdapter
祝你好运
这篇关于带有图像的 Android ViewPager:内存泄漏/应用程序崩溃的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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