使用位图Android的outofmemory错误

Question

I've created an android app, which chooses a picture from Gallery and displays a preview.

@Override
public void onClick(View v) {
    if (v.getId()== R.id.button){

        Intent intent = new Intent();
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_PICK);
        startActivityForResult(Intent.createChooser(intent,
                "Select Picture"), SELECT_PICTURE);
    }

After the image is selected, the preview should be shown.

Yet, it works only for the first time. And later when I click back, it shows outOfMemoryException

Answer 1

working with bitmaps in android costs you a lot of memory, which needs a hude attention because of memory leaks.

you can always use

System.gc()

to garbage collect and free up some memory.

or

bitmap.recycle();

cheack out these blog post that I used when I developed my image editing app.

• Curious-create.org
• Evendanan.net

Answer 2

Working with bitmaps in android often throws the OutOfMemory error. Bitmaps need to be handled properly. you might want to look at the following libraries used specifically for image loading and working with bitmaps in android:

https://github.com/nostra13/Android-Universal-Image-Loader

https://github.com/novoda/ImageLoader

You can also implement your own imageloader. You can find the code for that easily.

Answer 3

you are probably caching a lot of bitmaps, so you could use ImageLoader and do something like this:

ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(
                this).memoryCache(new WeakMemoryCache())
                .discCache(new UnlimitedDiscCache(new File("/cache"))).build();

also try somehow to release bitmaps after you no longer need them