显示GridView控件组件多张图片时的Android应用程序崩溃 [英] Android application crashes when showing multiple images in GridView component
问题描述
我是相当新的这个网站，我来这里是因为我无法找到这个答案其他地方，所以我想看看，如果我能得到一些帮助！
I am fairly new to this site and I'm here because I couldn't find this answer anywhere else so I would like to see if I could get some help!
我在我的项目的GridView以及一个图像适配器。我需要用下面的code帮助：
I have a GridView in my project as well as a Image Adapter. I need help with the following code:
package com.humanoid.sigma;
import android.app.Activity;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
public class ImageAdapter extends BaseAdapter {
private Context mContext;
public Integer[] Tattoos = {
R.drawable.tattoo1, R.drawable.tattoo2,
R.drawable.tattoo3, R.drawable.tattoo4,
R.drawable.tattoo5, /*R.drawable.tattoo6,
R.drawable.tattoo7, R.drawable.tattoo8,
R.drawable.tattoo9, R.drawable.tattoo10,
R.drawable.tattoo11, R.drawable.tattoo12,
R.drawable.tattoo13, R.drawable.tattoo14,
R.drawable.tattoo15, R.drawable.tattoo16,
R.drawable.tattoo17, R.drawable.tattoo18,
R.drawable.tattoo19, R.drawable.tattoo20,
R.drawable.tattoo21, R.drawable.tattoo22,
R.drawable.tattoo23, R.drawable.tattoo24,
R.drawable.tattoo25, R.drawable.tattoo26,
R.drawable.tattoo27, R.drawable.tattoo28,
R.drawable.tattoo29, R.drawable.tattoo30,
R.drawable.tattoo31, R.drawable.tattoo32,
R.drawable.tattoo33, R.drawable.tattoo34,
R.drawable.tattoo35, R.drawable.tattoo36,
R.drawable.tattoo37, R.drawable.tattoo38,
R.drawable.tattoo39, R.drawable.tattoo40,
R.drawable.tattoo41, R.drawable.tattoo42,
R.drawable.tattoo43, R.drawable.tattoo44,
R.drawable.tattoo45, R.drawable.tattoo46,
R.drawable.tattoo47, R.drawable.tattoo48,
R.drawable.tattoo49, R.drawable.tattoo50,
R.drawable.tattoo51, R.drawable.tattoo52,
R.drawable.tattoo53, R.drawable.tattoo54,
R.drawable.tattoo55, R.drawable.tattoo56,
R.drawable.tattoo57, R.drawable.tattoo58,
R.drawable.tattoo59, R.drawable.tattoo60,
R.drawable.tattoo61, R.drawable.tattoo62,
R.drawable.tattoo63, R.drawable.tattoo64,
R.drawable.tattoo65, R.drawable.tattoo66,
R.drawable.tattoo67, R.drawable.tattoo68,
R.drawable.tattoo69, R.drawable.tattoo70,
R.drawable.tattoo71, R.drawable.tattoo72,
R.drawable.tattoo73, R.drawable.tattoo74,
R.drawable.tattoo75, R.drawable.tattoo76,
R.drawable.tattoo77, R.drawable.tattoo78,
R.drawable.tattoo79, R.drawable.tattoo80,
R.drawable.tattoo81, R.drawable.tattoo82,*/
};
// Constructor
public ImageAdapter(Context c){
mContext = c;
}
public int getCount() {
return Tattoos.length;
}
public Object getItem(int position) {
return Tattoos[position];
}
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView = new ImageView(mContext);
imageView.setImageResource(Tattoos[position]);
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setLayoutParams(new GridView.LayoutParams(100, 70));
return imageView;
}
}
logcat的堆栈跟踪：
Logcat Stack Trace:
17 06-28：51：14.104：E / AndroidRuntime（818）：致命异常：主要06-28
17：51：14.104：E / AndroidRuntime（818）：搜索
java.lang.OutOfMemoryError 06-28 17：51：14.104：E / AndroidRuntime（818）：
在结果
android.graphics.BitmapFactory.nativeDe $ C $检测板（本机方法）06-28
17：51：14.104：E / AndroidRuntime（818）：在
android.graphics.BitmapFactory.de codeStream（BitmapFactory.java:502）
06-28 17：51：14.104：E / AndroidRuntime（818）：在
android.graphics.BitmapFactory.de codeResourceStream（BitmapFactory.java:355）
06-28 17：51：14.104：E / AndroidRuntime（818）：在
android.graphics.drawable.Drawable.createFromResourceStream（Drawable.java:785）
06-28 17：51：14.104：E / AndroidRuntime（818）：在
android.content.res.Resources.loadDrawable（Resources.java:1965）06-28
17：51：14.104：E / AndroidRuntime（818）：在
android.content.res.Resources.getDrawable（Resources.java:660）06-28
17：51：14.104：E / AndroidRuntime（818）：在
android.widget.ImageView.resolveUri（ImageView.java:616）06-28
17：51：14.104：E / AndroidRuntime（818）：在
android.widget.ImageView.setImageResource（ImageView.java:349）06-28
17：51：14.104：E / AndroidRuntime（818）：在
com.humanoid.sigma.ImageAdapter.getView（ImageAdapter.java:80）06-28
17：51：14.104：E / AndroidRuntime（818）：在
android.widget.AbsListView.obtainView（AbsListView.java:2143）06-28
17：51：14.104：E / AndroidRuntime（818）：在
android.widget.GridView.makeAndAddView（GridView.java:1341）06-28
17：51：14.104：E / AndroidRuntime（818）：在
android.widget.GridView.makeRow（GridView.java:341）06-28 17：51：14.104：
E / AndroidRuntime（818）：在
android.widget.GridView.fillDown（GridView.java:283）06-28
17：51：14.104：E / AndroidRuntime（818）：在
android.widget.GridView.fillFromTop（GridView.java:417）06-28
17：51：14.104：E / AndroidRuntime（818）：在
android.widget.GridView.layoutChildren（GridView.java:1229）06-28
17：51：14.104：E / AndroidRuntime（818）：在
android.widget.AbsListView.onLayout（AbsListView.java:1994）06-28
17：51：14.104：E / AndroidRuntime（818）：在
android.view.View.layout（View.java:14003）06-28 17：51：14.104：
E / AndroidRuntime（818）：在
android.view.ViewGroup.layout（ViewGroup.java:4375）06-28 17：51：14.104：
E / AndroidRuntime（818）：在
android.widget.RelativeLayout.onLayout（RelativeLayout.java:985）06-28
17：51：14.104：E / AndroidRuntime（818）：在
android.view.View.layout（View.java:14003）06-28 17：51：14.104：
E / AndroidRuntime（818）：在
android.view.ViewGroup.layout（ViewGroup.java:4375）06-28 17：51：14.104：
E / AndroidRuntime（818）：在
android.widget.FrameLayout.onLayout（FrameLayout.java:448）06-28
17：51：14.104：E / AndroidRuntime（818）：在
android.view.View.layout（View.java:14003）06-28 17：51：14.104：
E / AndroidRuntime（818）：在
android.view.ViewGroup.layout（ViewGroup.java:4375）06-28 17：51：14.104：
E / AndroidRuntime（818）：在
android.widget.LinearLayout.setChildFrame（LinearLayout.java:1663）
06-28 17：51：14.104：E / AndroidRuntime（818）：在
android.widget.LinearLayout.layoutVertical（LinearLayout.java:1521）
06-28 17：51：14.104：E / AndroidRuntime（818）：在
android.widget.LinearLayout.onLayout（LinearLayout.java:1434）06-28
17：51：14.104：E / AndroidRuntime（818）：在
android.view.View.layout（View.java:14003）06-28 17：51：14.104：
E / AndroidRuntime（818）：在
android.view.ViewGroup.layout（ViewGroup.java:4375）06-28 17：51：14.104：
E / AndroidRuntime（818）：在
android.widget.FrameLayout.onLayout（FrameLayout.java:448）06-28
17：51：14.104：E / AndroidRuntime（818）：在
android.view.View.layout（View.java:14003）06-28 17：51：14.104：
E / AndroidRuntime（818）：在
android.view.ViewGroup.layout（ViewGroup.java:4375）06-28 17：51：14.104：
E / AndroidRuntime（818）：在
android.view.ViewRootImpl.performLayout（ViewRootImpl.java:1892）06-28
17：51：14.104：E / AndroidRuntime（818）：在
android.view.ViewRootImpl.performTraversals（ViewRootImpl.java:1711）
06-28 17：51：14.104：E / AndroidRuntime（818）：在
android.view.ViewRootImpl.doTraversal（ViewRootImpl.java:989）06-28
17：51：14.104：E / AndroidRuntime（818）：在
android.view.ViewRootImpl $ TraversalRunnable.run（ViewRootImpl.java:4351）
06-28 17：51：14.104：E / AndroidRuntime（818）：在
android.view.Choreographer $ CallbackRecord.run（Choreographer.java:749）
06-28 17：51：14.104：E / AndroidRuntime（818）：在
android.view.Choreographer.doCallbacks（Choreographer.java:562）06-28
17：51：14.104：E / AndroidRuntime（818）：在
android.view.Choreographer.doFrame（Choreographer.java:532）06-28
17：51：14.104：E / AndroidRuntime（818）：在
android.view.Choreographer $ FrameDisplayEventReceiver.run（Choreographer.java:735）
06-28 17：51：14.104：E / AndroidRuntime（818）：在
android.os.Handler.handleCallback（Handler.java:725）06-28
17：51：14.104：E / AndroidRuntime（818）：在
android.os.Handler.dispatchMessage（Handler.java:92）06-28
17：51：14.104：E / AndroidRuntime（818）：在
android.os.Looper.loop（Looper.java:137）06-28 17：51：14.104：
E / AndroidRuntime（818）：在
android.app.ActivityThread.main（ActivityThread.java:5039）06-28
17：51：14.104：E / AndroidRuntime（818）：在
java.lang.reflect.Method.invokeNative（本机方法）06-28
17：51：14.104：E / AndroidRuntime（818）：在
java.lang.reflect.Method.invoke（Method.java:511）06-28 17：51：14.104：
E / AndroidRuntime（818）：在
com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:793）
06-28 17：51：14.104：E / AndroidRuntime（818）：在
com.android.internal.os.ZygoteInit.main（ZygoteInit.java:560）06-28
17：51：14.104：E / AndroidRuntime（818）：在
dalvik.system.NativeStart.main（本机方法）
06-28 17:51:14.104: E/AndroidRuntime(818): FATAL EXCEPTION: main 06-28 17:51:14.104: E/AndroidRuntime(818):
java.lang.OutOfMemoryError 06-28 17:51:14.104: E/AndroidRuntime(818): at
android.graphics.BitmapFactory.nativeDecodeAsset(Native Method) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:502) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:355) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:785) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.content.res.Resources.loadDrawable(Resources.java:1965) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.content.res.Resources.getDrawable(Resources.java:660) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.widget.ImageView.resolveUri(ImageView.java:616) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.widget.ImageView.setImageResource(ImageView.java:349) 06-28 17:51:14.104: E/AndroidRuntime(818): at com.humanoid.sigma.ImageAdapter.getView(ImageAdapter.java:80) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.widget.AbsListView.obtainView(AbsListView.java:2143) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.widget.GridView.makeAndAddView(GridView.java:1341) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.widget.GridView.makeRow(GridView.java:341) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.widget.GridView.fillDown(GridView.java:283) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.widget.GridView.fillFromTop(GridView.java:417) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.widget.GridView.layoutChildren(GridView.java:1229) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.widget.AbsListView.onLayout(AbsListView.java:1994) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.view.View.layout(View.java:14003) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.view.ViewGroup.layout(ViewGroup.java:4375) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.widget.RelativeLayout.onLayout(RelativeLayout.java:985) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.view.View.layout(View.java:14003) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.view.ViewGroup.layout(ViewGroup.java:4375) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.widget.FrameLayout.onLayout(FrameLayout.java:448) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.view.View.layout(View.java:14003) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.view.ViewGroup.layout(ViewGroup.java:4375) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1663) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1521) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.widget.LinearLayout.onLayout(LinearLayout.java:1434) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.view.View.layout(View.java:14003) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.view.ViewGroup.layout(ViewGroup.java:4375) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.widget.FrameLayout.onLayout(FrameLayout.java:448) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.view.View.layout(View.java:14003) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.view.ViewGroup.layout(ViewGroup.java:4375) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:1892) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1711) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.view.Choreographer.doCallbacks(Choreographer.java:562) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.view.Choreographer.doFrame(Choreographer.java:532) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.os.Handler.handleCallback(Handler.java:725) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.os.Handler.dispatchMessage(Handler.java:92) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.os.Looper.loop(Looper.java:137) 06-28 17:51:14.104: E/AndroidRuntime(818): at android.app.ActivityThread.main(ActivityThread.java:5039) 06-28 17:51:14.104: E/AndroidRuntime(818): at java.lang.reflect.Method.invokeNative(Native Method) 06-28 17:51:14.104: E/AndroidRuntime(818): at java.lang.reflect.Method.invoke(Method.java:511) 06-28 17:51:14.104: E/AndroidRuntime(818): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 06-28 17:51:14.104: E/AndroidRuntime(818): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 06-28 17:51:14.104: E/AndroidRuntime(818): at dalvik.system.NativeStart.main(Native Method)
Gallery.Java code：
Gallery.Java code:
package com.humanoid.sigma;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
public class Gallery extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.gallery);
GridView gridView = (GridView) findViewById(R.id.photos);
// Instance of ImageAdapter Class
gridView.setAdapter(new ImageAdapter(this));
gridView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
// Sending image id to FullScreenActivity
Intent i = new Intent(getApplicationContext(), FullScreen.class);
// passing array index
i.putExtra("id", position);
startActivity(i);
}
});
}
}
正如你可以从上面看到的，我都注释掉了什么是不为我工作。我不知道这是否是因为我对这个GridView的图片太多，但它是相当烦人。一旦我评论这些图片了程序运行正常，但如果我删除/ *和运行程序，并选择画廊，它只是显示黑屏。不久后，它会崩溃。
As you can see from above, I have commented out what isn't working for me. I don't know if it's because I have too many pictures for this GridView but it's rather annoying. Once I commented those images out the program runs fine but if I delete the /* and run the program and select Gallery, it would just show a black screen. Shortly after it would crash.
请帮我这个code我一直在寻找，但找不到任何帮助。
Please help me with this code I keep searching but can't find anything to help.
推荐答案
您的问题的出现是由于堆大小的枯竭而分配绘图资源（这是一个常见的问题，因为大量的内存对于这种操作的必要）
Your problem arises due to the exhaustion of the heap size while allocating drawable resources (it is a common problem, since lots of memory required for this kind of operation).
当我试图您的code，我得到 java.lang.OutOfMemoryError：位图的大小超过VM预算。这是一个简单的不言自明的错误消息。
When i have tried your code, i got java.lang.OutOfMemoryError: bitmap size exceeds VM budget . Which is a straightforward self-explanatory error message.
然后我做了一些研究，在整个官方Android开发人员网站'本土'线程传来：的 http://developer.android.com/training/displaying-bitmaps/index.html了解位图和如何进行有效的资源分配中的应用实例。
Then i made some research and came across a 'native' thread on official Android Dev website: http://developer.android.com/training/displaying-bitmaps/index.html about Bitmaps and examples on how to make efficient resource allocations in applications.
于是，我尝试过了，你的code相结合，这是我得到了什么：
So I tried it and combined with your code and this is what i got:
ImageAdapter.java
package com.humanoid.sigma;
import android.app.Activity;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
public class ImageAdapter extends BaseAdapter {
private Context mContext;
public Integer[] Tattoos = {
R.drawable.tattoo1, R.drawable.tattoo2,
R.drawable.tattoo3, R.drawable.tattoo4,
R.drawable.tattoo5, R.drawable.tattoo6,
R.drawable.tattoo7, R.drawable.tattoo8,
R.drawable.tattoo9, R.drawable.tattoo10,
R.drawable.tattoo11, R.drawable.tattoo12,
R.drawable.tattoo13, R.drawable.tattoo14,
R.drawable.tattoo15, R.drawable.tattoo16,
R.drawable.tattoo17, R.drawable.tattoo18,
R.drawable.tattoo19, R.drawable.tattoo20,
R.drawable.tattoo21, R.drawable.tattoo22,
R.drawable.tattoo23, R.drawable.tattoo24,
R.drawable.tattoo25, R.drawable.tattoo26,
R.drawable.tattoo27, R.drawable.tattoo28,
R.drawable.tattoo29, R.drawable.tattoo30,
R.drawable.tattoo31, R.drawable.tattoo32,
R.drawable.tattoo33, R.drawable.tattoo34,
R.drawable.tattoo35, R.drawable.tattoo36,
R.drawable.tattoo37, R.drawable.tattoo38,
R.drawable.tattoo39, R.drawable.tattoo40,
R.drawable.tattoo41, R.drawable.tattoo42,
R.drawable.tattoo43, R.drawable.tattoo44,
R.drawable.tattoo45, R.drawable.tattoo46,
R.drawable.tattoo47, R.drawable.tattoo48,
R.drawable.tattoo49, R.drawable.tattoo50,
R.drawable.tattoo51, R.drawable.tattoo52,
R.drawable.tattoo53, R.drawable.tattoo54,
R.drawable.tattoo55, R.drawable.tattoo56,
R.drawable.tattoo57, R.drawable.tattoo58,
R.drawable.tattoo59, R.drawable.tattoo60,
R.drawable.tattoo61, R.drawable.tattoo62,
R.drawable.tattoo63, R.drawable.tattoo64,
R.drawable.tattoo65, R.drawable.tattoo66,
R.drawable.tattoo67, R.drawable.tattoo68,
R.drawable.tattoo69, R.drawable.tattoo70,
R.drawable.tattoo71, R.drawable.tattoo72,
R.drawable.tattoo73, R.drawable.tattoo74,
R.drawable.tattoo75, R.drawable.tattoo76,
R.drawable.tattoo77, R.drawable.tattoo78,
R.drawable.tattoo79, R.drawable.tattoo80,
R.drawable.tattoo81, R.drawable.tattoo82
};
// Constructor
public ImageAdapter(Context c){
mContext = c;
}
public int getCount() {
return Tattoos.length;
}
public Object getItem(int position) {
return Tattoos[position];
}
public long getItemId(int position) {
return 0;
}
public View getView(int position, View convertView, ViewGroup parent) {
//This actually is a bad solution, because every time convertView is reused, you will still initialize new ImageView, which is wrong
//ImageView imageView = new ImageView(this.mContext);
//new BitmapWorkerTask(imageView).execute(Tattoos[position]);
//return imageView;
//Better solution
ImageView imageView = null;
if (convertView == null) {
imageView = new ImageView(this.mContext);
new BitmapWorkerTask(imageView).execute(Tattoos[position]);
//create new ImageView if it is not present and populate it with some image
} else {
imageView = (ImageView) convertView;
//re-use ImageView that already exists in memory
}
return imageView;
}
class BitmapWorkerTask extends AsyncTask<Integer, Void, Bitmap> {
private final WeakReference<ImageView> imageViewReference;
private int data = 0;
public BitmapWorkerTask(ImageView imageView) {
// Use a WeakReference to ensure the ImageView can be garbage collected
imageViewReference = new WeakReference<ImageView>(imageView);
}
// Decode image in background.
@Override
protected Bitmap doInBackground(Integer... params) {
data = params[0];
return decodeSampledBitmapFromResource(ImageAdapter.this.mContext.getResources(), data, 100, 100);
}
// Once complete, see if ImageView is still around and set bitmap.
@Override
protected void onPostExecute(Bitmap bitmap) {
if (imageViewReference != null && bitmap != null) {
final ImageView imageView = imageViewReference.get();
if (imageView != null) {
imageView.setImageBitmap(bitmap);
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setLayoutParams(new GridView.LayoutParams(100, 70));
}
}
}
}
public static Bitmap decodeSampledBitmapFromResource(Resources res, int resId,
int reqWidth, int reqHeight) {
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeResource(res, resId, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
return BitmapFactory.decodeResource(res, resId, options);
}
public static int calculateInSampleSize(
BitmapFactory.Options options, int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
// Calculate ratios of height and width to requested height and width
final int heightRatio = Math.round((float) height / (float) reqHeight);
final int widthRatio = Math.round((float) width / (float) reqWidth);
// Choose the smallest ratio as inSampleSize value, this will guarantee
// a final image with both dimensions larger than or equal to the
// requested height and width.
inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
}
return inSampleSize;
}
}
这异步加载的图像和做对资源加载一些额外的魔法。
Which loads images asynchronously and does some additional magic on loaded resources.
此解决方案的工作对我很好，当你运行你的code，你可以看到被加载到图片的时间，开始一个是重量轻和走上坡路，我猜，因为对于每一个的ImageView 将有一个独立的工作发，这将加载和转换的资源，然后把它应用到的ImageView 。
This solution works fine for me and when you run your code, you can actually see images being loaded one at a time, starting with one that is of less weight and going upwards, i guess, because for every ImageView there will be a separate worker Thread, which will load and transform the resource and then apply it to the ImageView.
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