我是这个网站的新手,我在这里是因为我无法在其他任何地方找到这个答案,所以我想看看能否得到一些帮助!
我的项目中有一个GridView以及一个Image Adapter。我需要以下代码的帮助:
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堆栈跟踪:
06-28 17:51:14.104:E / AndroidRuntime(818):致命异常:主06-28 17:51:14.104:E / AndroidRuntime(818):
java.lang.OutOfMemoryError 06-28 17:51:14.104:E / AndroidRuntime(818): 在
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(原生方法)
Gallery.Java代码:
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);
}
});
}
}
从上面可以看出,我已经评论了什么不适合我。我不知道是不是因为我为这个GridView拍了太多照片但它很烦人。一旦我评论了这些图像,程序运行正常,但如果我删除/ *并运行程序并选择图库,它只会显示黑屏。它崩溃后不久。
请帮我处理这些我一直在寻找的代码,但无法找到帮助。
答案 0 :(得分:3)
您的问题是由于在分配可绘制资源时堆大小耗尽而引起的(这是一个常见问题,因为此类操作需要大量内存)。
当我尝试过你的代码时,我得到了java.lang.OutOfMemoryError: bitmap size exceeds VM budget
。这是一个简单易懂的错误信息。
然后我做了一些研究,并在官方Android Dev网站上发现了一个“原生”主题:http://developer.android.com/training/displaying-bitmaps/index.html关于位图以及如何在应用程序中进行有效资源分配的示例。
所以我尝试了它并结合你的代码,这就是我得到的:
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;
}
}
以异步方式加载图像,并在加载的资源上添加一些额外的魔法。
这个解决方案对我来说运行正常,当你运行你的代码时,你实际上可以看到一次加载一个图像,从一个重量较轻且向上的图像开始,我猜,因为每个{{1}将有一个单独的工作人员ImageView
,它将加载和转换资源,然后将其应用于Thread
。
证明: