android - 将图像加载到位图对象时出现内存不足问题(Strange out of memory issue while loading an image to a Bitmap object)

Question

I have a list view with a couple of image buttons on each row.

(我有一个列表视图，每行都有几个图像按钮。)

When you click the list row, it launches a new activity.

(当您单击列表行时，它将启动一个新活动。)

I have had to build my own tabs because of an issue with the camera layout.

(由于相机布局存在问题，我不得不构建自己的标签。)

The activity that gets launched for the result is a map.

(为结果而启动的活动是地图。)

If I click on my button to launch the image preview (load an image off the SD card) the application returns from the activity back to the listview activity to the result handler to relaunch my new activity which is nothing more than an image widget.

(如果单击我的按钮以启动图像预览（将图像从SD卡加载），则应用程序将从活动返回到listview活动，再返回到结果处理程序，以重新启动我的新活动，无非就是图像小部件。)

The image preview on the list view is being done with the cursor and ListAdapter .

(列表视图上的图像预览是使用光标和ListAdapter 。)

This makes it pretty simple, but I am not sure how I can put a resized image (Ie Smaller bit size not pixel as the src for the image button on the fly. So I just resized the image that came off the phone camera.

(这非常简单，但是我不确定如何放置一个调整大小后的图像（即，较小的位大小而不是像素作为飞行中图像按钮的src 。因此，我只是调整了从电话摄像头传来的图像的大小。)

The issue is that I get an out of memory error when it tries to go back and re-launch the 2nd activity.

(问题是，当它尝试返回并重新启动第二个活动时，出现内存不足错误。)

• Is there a way I can build the list adapter easily row by row, where I can resize on the fly ( bit wise )?

  (有没有一种方法可以轻松地逐行构建列表适配器，从而可以即时调整大小（逐位 ）？)

This would be preferable as I also need to make some changes to the properties of the widgets/elements in each row as I am unable to select a row with the touch screen because of the focus issue.

(这将是更可取的，因为我也需要对每行中的小部件/元素的属性进行一些更改，因为由于焦点问题而无法使用触摸屏选择一行。)

( I can use roller ball. )

(（ 我可以用滚球。 ）)

• I know I can do an out of band resize and save of my image, but that is not really what I want to do, but some sample code for that would be nice.

  (我知道我可以进行带外调整大小并保存图像，但这并不是我真正想做的，但是一些示例代码会很不错。)

As soon as I disabled the image on the list view it worked fine again.

(一旦禁用列表视图中的图像，它就会再次正常工作。)

FYI: This is how I was doing it:

(仅供参考：这就是我的做法：)

String[] from = new String[] { DBHelper.KEY_BUSINESSNAME,DBHelper.KEY_ADDRESS,DBHelper.KEY_CITY,DBHelper.KEY_GPSLONG,DBHelper.KEY_GPSLAT,DBHelper.KEY_IMAGEFILENAME  + ""};
int[] to = new int[] {R.id.businessname,R.id.address,R.id.city,R.id.gpslong,R.id.gpslat,R.id.imagefilename };
notes = new SimpleCursorAdapter(this, R.layout.notes_row, c, from, to);
setListAdapter(notes);

Where R.id.imagefilename is a ButtonImage .

(其中R.id.imagefilename是ButtonImage 。)

Here is my LogCat:

(这是我的LogCat：)

01-25 05:05:49.877: ERROR/dalvikvm-heap(3896): 6291456-byte external allocation too large for this process.
01-25 05:05:49.877: ERROR/(3896): VM wont let us allocate 6291456 bytes
01-25 05:05:49.877: ERROR/AndroidRuntime(3896): Uncaught handler: thread main exiting due to uncaught exception
01-25 05:05:49.917: ERROR/AndroidRuntime(3896): java.lang.OutOfMemoryError: bitmap size exceeds VM budget
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:304)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:149)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:174)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.graphics.drawable.Drawable.createFromPath(Drawable.java:729)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.ImageView.resolveUri(ImageView.java:484)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.ImageView.setImageURI(ImageView.java:281)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.SimpleCursorAdapter.setViewImage(SimpleCursorAdapter.java:183)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.SimpleCursorAdapter.bindView(SimpleCursorAdapter.java:129)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.CursorAdapter.getView(CursorAdapter.java:150)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.AbsListView.obtainView(AbsListView.java:1057)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.ListView.makeAndAddView(ListView.java:1616)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.ListView.fillSpecific(ListView.java:1177)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.ListView.layoutChildren(ListView.java:1454)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.AbsListView.onLayout(AbsListView.java:937)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.view.View.layout(View.java:5611)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.LinearLayout.layoutHorizontal(LinearLayout.java:1108)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.LinearLayout.onLayout(LinearLayout.java:922)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.view.View.layout(View.java:5611)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.FrameLayout.onLayout(FrameLayout.java:294)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.view.View.layout(View.java:5611)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.LinearLayout.layoutVertical(LinearLayout.java:999)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.LinearLayout.onLayout(LinearLayout.java:920)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.view.View.layout(View.java:5611)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.FrameLayout.onLayout(FrameLayout.java:294)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.view.View.layout(View.java:5611)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.view.ViewRoot.performTraversals(ViewRoot.java:771)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1103)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.os.Handler.dispatchMessage(Handler.java:88)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.os.Looper.loop(Looper.java:123)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.app.ActivityThread.main(ActivityThread.java:3742)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at java.lang.reflect.Method.invokeNative(Native Method)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at java.lang.reflect.Method.invoke(Method.java:515)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:739)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:497)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at dalvik.system.NativeStart.main(Native Method)
01-25 05:10:01.127: ERROR/AndroidRuntime(3943): ERROR: thread attach failed 

I also have a new error when displaying an image:

(显示图像时也出现了新错误：)

01-25 22:13:18.594: DEBUG/skia(4204): xxxxxxxxxxx jpeg error 20 Improper call to JPEG library in state %d
01-25 22:13:18.604: INFO/System.out(4204): resolveUri failed on bad bitmap uri: 
01-25 22:13:18.694: ERROR/dalvikvm-heap(4204): 6291456-byte external allocation too large for this process.
01-25 22:13:18.694: ERROR/(4204): VM won't let us allocate 6291456 bytes
01-25 22:13:18.694: DEBUG/skia(4204): xxxxxxxxxxxxxxxxxxxx allocPixelRef failed

  ask by community wiki translate from so

Answer 1

To fix the OutOfMemory error, you should do something like this:

(要修复OutOfMemory错误，您应该执行以下操作：)

BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 8;
Bitmap preview_bitmap = BitmapFactory.decodeStream(is, null, options);

This inSampleSize option reduces memory consumption.

(此inSampleSize选项可减少内存消耗。)

Here's a complete method.

(这是一个完整的方法。)

First it reads image size without decoding the content itself.

(首先，它读取图像大小而不解码内容本身。)

Then it finds the best inSampleSize value, it should be a power of 2, and finally the image is decoded.

(然后，它找到最佳的inSampleSize值，应为2的幂，最后对图像进行解码。)

// Decodes image and scales it to reduce memory consumption
private Bitmap decodeFile(File f) {
    try {
        // Decode image size
        BitmapFactory.Options o = new BitmapFactory.Options();
        o.inJustDecodeBounds = true;
        BitmapFactory.decodeStream(new FileInputStream(f), null, o);

        // The new size we want to scale to
        final int REQUIRED_SIZE=70;

        // Find the correct scale value. It should be the power of 2.
        int scale = 1;
        while(o.outWidth / scale / 2 >= REQUIRED_SIZE && 
              o.outHeight / scale / 2 >= REQUIRED_SIZE) {
            scale *= 2;
        }

        // Decode with inSampleSize
        BitmapFactory.Options o2 = new BitmapFactory.Options();
        o2.inSampleSize = scale;
        return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
    } catch (FileNotFoundException e) {}
    return null;
}