android bitmap回收,bitmap被回收导致的一个bug

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于 2021-05-27 07:53:56 发布

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文章标签： android bitmap回收

在ListView的getView方法中使用Fresco加载图片并显示为SpannableString时，遇到Bitmap回收导致的运行时异常。当滑动大量页面后，部分TextView中的Bitmap被回收，触发Canvas尝试使用已回收的Bitmap。解决办法是正确管理和释放Bitmap资源，避免在滚动过程中回收正在使用的图片。

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在一个listview的getview方法中，有如下的代码：

ImageRequest imageRequest = ImageRequestBuilder

.newBuilderWithSource(Uri.parse(tuanItem.imgUrl))

.build();

ImagePipeline imagePipeline = Fresco.getImagePipeline();

DataSource dataSource = imagePipeline.fetchDecodedImage(imageRequest, this);

DataSubscriber dataSubscriber = new BaseDataSubscriber>() {

@Override

public void onNewResultImpl(DataSource> dataSource) {

if (!dataSource.isFinished()) {

return;

}

CloseableReference imageReference = dataSource.getResult();

if (imageReference != null) {

try {

CloseableBitmap closeableBitmap = (CloseableBitmap)imageReference.clone().get();

Bitmap loadedImage = closeableBitmap.getUnderlyingBitmap();

if (loadedImage == null)

return;

Drawable drawable = new BitmapDrawable(loadedImage);

drawable.setBounds(0, 0, Utils.dip2px(mActivity, (float) 40),

Utils.dip2px(mActivity, (float) 15));

SpannableString spannableString = new SpannableString(" " + tuanItem.mTitle);

spannableString.setSpan(new ImageSpan(drawable), 0, 1, Spannable.SPAN_INCLUSIVE_EXCLUSIVE);

holder.title.setText(spannableString);

} finally {

imageReference.close();

}

@Override

public void onFailureImpl(DataSource dataSource) {

holder.title.setText(tuanItem.mTitle);

}

};

dataSource.subscribe(dataSubscriber, CallerThreadExecutor.getInstance());

如上面代码所示，我把一个通过dataSubscriber获取到的bitmap对象以SpannableString的方式放入一个TextView中。当滑动了大量页面之后，部分textview中的bitmap被回收，导致了如下的bug：

java.lang.RuntimeException: Canvas: trying to use a recycled bitmap android.graphics.Bitmap@433bbad8

at android.graphics.Canvas.throwIfCannotDraw(Canvas.java:1084)

at android.view.GLES20Canvas.drawBitmap(GLES20Canvas.java:844)

at android.graphics.drawable.BitmapDrawable.draw(BitmapDrawable.java:493)

at android.text.style.DynamicDrawableSpan.draw(DynamicDrawableSpan.java:107)

at android.text.TextLine.handleReplacement(TextLine.java:854)

at android.text.TextLine.handleRun(TextLine.java:937)

at android.text.TextLine.drawRun(TextLine.java:395)

at android.text.TextLine.draw(TextLine.java:193)

at android.text.Layout.drawText(Layout.java:348)

at android.text.Layout.draw(Layout.java:205)

at android.widget.TextView.onDraw(TextView.java:5172)

at android.view.View.draw(View.java:14476)

at android.view.View.getDisplayList(View.java:13373)

at android.view.View.getDisplayList(View.java:13415)

at android.view.View.draw(View.java:14193)

at android.view.ViewGroup.drawChild(ViewGroup.java:3103)

at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2940)

at android.view.View.draw(View.java:14479)

at android.view.View.getDisplayList(View.java:13373)

at android.view.View.getDisplayList(View.java:13415)

at android.view.View.draw(View.java:14193)

at android.view.ViewGroup.drawChild(ViewGroup.java:3103)

at android.widget.ListView.drawChild(ListView.java:3363)

at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2940)

at android.widget.AbsListView.dispatchDraw(AbsListView.java:2477)

at android.widget.ListView.dispatchDraw(ListView.java:3358)

at com.handmark.pulltorefresh.library.AutoLoadMoreListView$LoadMoreListView.dispatchDraw(SourceFile:359)

at com.handmark.pulltorefresh.library.AutoLoadMoreListView$InternalListView.dispatchDraw(SourceFile:470)

at android.view.View.draw(View.java:14479)

at android.widget.AbsListView.draw(AbsListView.java:3877)

at android.view.View.getDisplayList(View.java:13373)

at android.view.View.getDisplayList(View.java:13415)

at android.view.View.draw(View.java:14193)

at android.view.ViewGroup.drawChild(ViewGroup.java:3103)

at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2940)

at android.view.View.getDisplayList(View.java:13368)

at android.view.View.getDisplayList(View.java:13415)

at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3077)

at android.view.View.getDisplayList(View.java:13311)

at android.view.View.getDisplayList(View.java:13415)

at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3077)

at android.view.View.getDisplayList(View.java:13311)

at android.view.View.getDisplayList(View.java:13415)

at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3077)

at android.view.View.getDisplayList(View.java:13311)

at android.view.View.getDisplayList(View.java:13415)

at android.view.View.draw(View.java:14193)

at android.view.ViewGroup.drawChild(ViewGroup.java:3103)

at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2940)

at android.view.View.getDisplayList(View.java:13368)

at android.view.View.getDisplayList(View.java:13415)

at android.view.View.draw(View.java:14193)

at android.view.ViewGroup.drawChild(ViewGroup.java:3103)

at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2940)

at android.view.View.getDisplayList(View.java:13368)

at android.view.View.getDisplayList(View.java:13415)

at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3077)

at android.view.View.getDisplayList(View.java:13311)

at android.view.View.getDisplayList(View.java:13415)

at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3077)

at android.view.View.getDisplayList(View.java:13311)

at android.view.View.getDisplayList(View.java:13415)

at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3077)

at android.view.View.getDisplayList(View.java:13311)

at android.view.View.getDisplayList(View.java:13415)

at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3077)

at android.view.View.getDisplayList(View.java:133

请问是否我的代码写法有误，如果是这样，这样的场景下，应该如何获取bitmap对象来使用SpannableString呢？希望你们能看懂中文。感谢。