首先，我通过解析 json 响应创建图像和图像信息的 Arraylist
`JSONArray jsonArray = jsonObj.getJSONArray("result");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObjInner = jsonArray.getJSONObject(i);
ImageInfo imageInfo = new ImageInfo();
imageInfo.setImageUrl("http://www.dvimaytech.com/markphoto/" + jsonObjInner.getString("image"));
new GetDrawableFromUrl(imageInfo).execute();
imageInfo.setEmail(jsonObjInner.getString("emailid"));
imageInfo.setImage_id(jsonObjInner.getString("image_id"));
imageInfo.setImage_name(jsonObjInner.getString("image_name"));
imageInfo.setAmount(jsonObjInner.getString("amount"));
imageInfo.setImage_description(jsonObjInner.getString("image_description"));
imageInfo.setDate_created(jsonObjInner.getString("date_created"));
}`
然后我使用代码从服务器另一个异步任务中获取图像
public class GetDrawableFromUrl extends AsyncTask<Void, Void, Drawable> {
public ImageInfo imageInfoObj;
GetDrawableFromUrl(ImageInfo imageInfo) {
imageInfoObj = imageInfo;
}
@Override
protected Drawable doInBackground(Void... params) {
try {
return Drawable.createFromStream(((java.io.InputStream) new java.net.URL(imageInfoObj.getImageUrl()).getContent()), "src_name");
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(Drawable drawable) {
if (drawable != null) {
imageInfoObj.setImage(drawable);
listImageInfo.add(imageInfoObj);
showImagesInList();
}
}
}
我的适配器类代码
public class MyImageListAdapter extends BaseAdapter {
private LayoutInflater inflater = null;
public MyImageListAdapter() {
inflater = (LayoutInflater) HomeActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public int getCount() {
return listImageInfo.size();
}
public Object getItem(int position) {
return listImageInfo.get(position);
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
View vi = convertView;
if (convertView == null) {
vi = inflater.inflate(R.layout.list_row, null);
}
TextView tvName = (TextView) vi.findViewById(R.id.tv_name);
TextView tvTime = (TextView) vi.findViewById(R.id.tv_time);
ImageView image = (ImageView) vi.findViewById(R.id.iv_image);
final Button btnDelete = (Button) vi.findViewById(R.id.btn_delete);
image.setImageDrawable(listImageInfo.get(position).getImage());
tvName.setText("Name: " + listImageInfo.get(position).getImage_name());
tvTime.setText("Date: " + listImageInfo.get(position).getDate_created());
btnDelete.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
final int position = listView.getPositionForView((View) v.getParent());
positionOgBtnToDelete = position;
Log.v("delete btn clicked", "delete btn no: " + position);
Toast.makeText(HomeActivity.this, "Btn delete position: " + position, Toast.LENGTH_LONG).show();
showAlertToConfirmDelete();
}
});
return vi;
}
}
现在我的列表只包含 5-6 张图片。但是我在线收到错误 OutOfMemory 错误
return Drawable.createFromStream(((java.io.InputStream) new java.net.URL(imageInfoObj.getImageUrl()).getContent()), "src_name");
我的日志 - 猫是
E/dalvikvm-heap(10927): 7680000-byte external allocation too large for this process.
: D/dalvikvm(10927): GC_FOR_MALLOC freed 0K, 55% free 3286K/7303K, external 54717K/56765K, paused 32ms
: E/GraphicsJNI(10927): VM won't let us allocate 7680000 bytes
: D/skia(10927): libjpeg error 105 < Ss=%d, Se=%d, Ah=%d, Al=%d> from allocPixelRef [1600 1200]
D/skia(10927): --- decoder->decode returned false
W/dalvikvm(10927): threadid=9: thread exiting with uncaught exception (group=0x40018578)
E/AndroidRuntime(10927): FATAL EXCEPTION: AsyncTask #1
E/AndroidRuntime(10927): java.lang.RuntimeException: An error occured while executing doInBackground()
E/AndroidRuntime(10927): at android.os.AsyncTask$3.done(AsyncTask.java:200)
E/AndroidRuntime(10927): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274)
E/AndroidRuntime(10927): at java.util.concurrent.FutureTask.setException(FutureTask.java:125)
E/AndroidRuntime(10927): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308)
E/AndroidRuntime(10927): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
E/AndroidRuntime(10927): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
E/AndroidRuntime(10927): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
E/AndroidRuntime(10927): at java.lang.Thread.run(Thread.java:1019)
E/AndroidRuntime(10927): Caused by: java.lang.OutOfMemoryError: bitmap size exceeds VM budget
E/AndroidRuntime(10927): at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
E/AndroidRuntime(10927): at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:573)
E/AndroidRuntime(10927): at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:439)
E/AndroidRuntime(10927): at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:697)
E/AndroidRuntime(10927): at android.graphics.drawable.Drawable.createFromStream(Drawable.java:657)
E/AndroidRuntime(10927): at com.markphoto_activities.DisplayImagesActivity$GetDrawableFromUrl.doInBackground(DisplayImagesActivity.java:257)
E/AndroidRuntime(10927): at com.markphoto_activities.DisplayImagesActivity$GetDrawableFromUrl.doInBackground(DisplayImagesActivity.java:1)
E/AndroidRuntime(10927): at android.os.AsyncTask$2.call(AsyncTask.java:185)
E/AndroidRuntime(10927): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
E/AndroidRuntime(10927): ... 4 more
D/dalvikvm(10927): GC_EXTERNAL_ALLOC freed 122K, 55% free 3329K/7303K, external 55034K/56765K, paused 49ms
E/dalvikvm-heap(10927): 4194304-byte external allocation too large for this process.
D/dalvikvm(10927): GC_FOR_MALLOC freed <1K, 55% free 3329K/7303K, external 55034K/56765K, paused 32ms
E/GraphicsJNI(10927): VM won't let us allocate 4194304 bytes
而不是这个，我在另一个活动中显示相同的列表，我正在执行相同的过程。
还有其他两个活动：1.我使用相机意图捕获图像并上传到服务器（调用 api 并使用 Http Multipart Entity），以及 2.我从画廊上传图像。
这不是我收到此错误的唯一地方，实际上在其他地方很多。但是这条线上有 90% 的错误。
我想知道，问题是否出现是因为所有图像的单个大尺寸图像一起占用更多内存。以及如何删除它？