Android中Cannot draw recycled bitmaps

最新推荐文章于 2022-04-24 12:17:30 发布

yaya_soft

最新推荐文章于 2022-04-24 12:17:30 发布

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分类专栏： android 文章标签： recycled BitmapMap

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本文分析了Android 4.0与4.1版本中Bitmap绘制差异导致的IllegalArgumentException异常，并提供了异常处理方案。

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<pre name="code" class="java">java.lang.IllegalArgumentException: Cannot draw recycled bitmapsat android.view.GLES20Canvas.drawBitmap(GLES20Canvas.java:778)at android.view.GLES20RecordingCanvas.drawBitmap(GLES20RecordingCanvas.java:117)at android.graphics.drawable.BitmapDrawable.draw(BitmapDrawable.java:393)at android.widget.ImageView.onDraw(ImageView.java:979)at android.view.View.draw(View.java:13458)at android.view.View.getDisplayList(View.java:12409)at android.view.View.getDisplayList(View.java:12453)at android.view.View.draw(View.java:13182)at android.view.ViewGroup.drawChild(ViewGroup.java:2929)at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2799)at android.view.View.draw(View.java:13461)at android.view.View.getDisplayList(View.java:12409)at android.view.View.getDisplayList(View.java:12453)at android.view.View.draw(View.java:13182)at android.view.ViewGroup.drawChild(ViewGroup.java:2929)at android.widget.ListView.drawChild(ListView.java:3226)at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2799)at android.widget.AbsListView.dispatchDraw(AbsListView.java:2433)at android.widget.ListView.dispatchDraw(ListView.java:3221)at android.view.View.draw(View.java:13461)at android.widget.AbsListView.draw(AbsListView.java:3759)

经分析，引起原因：

android4.0和android4.1的api差异，Bitmap在创建缩略图时，4.1.1的时候，若缩略图和原图大小一样，创建的缩略图会返回原图，若原图的bitmap人为的回收或者系统回收，就会引起此异常。

GLES20Canvas相关源码如下：

android 4.0

    public void drawBitmap(Bitmap bitmap, float left, float top, Paint paint) {
        // Shaders are ignored when drawing bitmaps
        int modifiers = paint != null ? setupModifiers(bitmap, paint) : MODIFIER_NONE;
        final int nativePaint = paint == null ? 0 : paint.mNativePaint;
        nDrawBitmap(mRenderer, bitmap.mNativeBitmap, bitmap.mBuffer, left, top, nativePaint);
        if (modifiers != MODIFIER_NONE) nResetModifiers(mRenderer, modifiers);
    }

android4.1

public void drawBitmap(Bitmap bitmap, float left, float top, Paint paint) {
if (bitmap.isRecycled()) throw new IllegalArgumentException("Cannot draw recycled bitmaps");

        // Shaders are ignored when drawing bitmaps
        int modifiers = paint != null ? setupModifiers(bitmap, paint) : MODIFIER_NONE;
        try {
            final int nativePaint = paint == null ? 0 : paint.mNativePaint;
            nDrawBitmap(mRenderer, bitmap.mNativeBitmap, bitmap.mBuffer, left, top, nativePaint);
        } finally {
            if (modifiers != MODIFIER_NONE) nResetModifiers(mRenderer, modifiers);
        }
    }

因此，需要在以前写的程序中，加入异常捕获，程序才运行正常。