Question

我有imageView的活动。当我旋转设备onCreate开始在后台线程内创建位图时。经过几次旋转后，我在位图创建上有一个OutOfMemoryError。解决这个问题的正确方法是什么？ weak references是否有决定？这是我的代码：

public class ImageActivity extends AppcompatActivity implements View.OnTouchListener {

    private ImageView imageView;
    private Disposable imageDisp;

    @Override
    public void onDestroy() {
        imageDisp.dispose();
        super.onDestroy();
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_image);
        imageView = (ImageView) findViewById(R.id.main_imageview);

        String source = getIntent().getStringExtra("source");
        imageView.setImageBitmap(null);
        imageView.setTag(source);

        imageDisp = Observable.fromCallable(()->{
            File outputFile = new File(source);
            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inPreferredConfig = Bitmap.Config.ARGB_8888;
            Bitmap b = BitmapFactory.decodeFile(outputFile.getPath(), options); // here I have a outOfMemory
            outputFile.delete();
            return b;
        }).subscribeOn(Schedulers.newThread())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(bitmap -> {
                            imageView.setImageBitmap(bitmap);
                            imageView.setOnTouchListener(ImageActivity.this);
                },
                throwable -> Toast.makeText(this, String.valueOf(throwable.getMessage()), Toast.LENGTH_SHORT).show());
    }

}

Answer 1

我不知道它是多么正确，但这有效：

imageDisp = Observable.fromCallable(()->{
            System.gc();
            final WeakReference<Bitmap> bitmapReference = new WeakReference<Bitmap>(BitmapFactory.decodeFile(outputFile.getPath(), options));
            outputFile.delete();
            return bitmapReference;
        }).subscribeOn(Schedulers.newThread())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(bitmap -> {
                            imageView.setImageBitmap(bitmap.get());
                            imageView.setOnTouchListener(ImageActivity.this);
                },
                throwable -> Toast.makeText(this, String.valueOf(throwable.getMessage()), Toast.LENGTH_SHORT).show());

Android系统。旋转时可观察内部位图创建的OutOfMemory错误

1 个答案: