java - 从缓存中恢复图片时android OutOfMemoryError

Question

我的应用程序有一个 GridView，其中每个项目都是 ImageView。我编写了自定义适配器以将图像设置到 ImageViews 中。使用 AsyncTask 异步设置图像

我的 AsyncTask 从缓存中恢复图像

@Override
protected Bitmap doInBackground(Void... params) {
   return BitmapFactory.decodeFile(file.getAbsolutePath());
}

@Override
protected void onPostExecute(Bitmap bitmap) {
    if (bitmap != null) {
        imageView.setImageBitmap(bitmap);
    } else {
        // load image from db
    }
}

放置在 fragment 上的 GridView。在进行 fragment 替换后，我在 BitmapFactory.decodeFile(file.getAbsolutePath());

行出现了 OutOfMemoryError

E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #2
    java.lang.RuntimeException: An error occured while executing doInBackground()
            at android.os.AsyncTask$3.done(AsyncTask.java:299)
            at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
            at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
            at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
            at java.util.concurrent.FutureTask.run(FutureTask.java:137)
            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
            at java.lang.Thread.run(Thread.java:864)
     Caused by: java.lang.OutOfMemoryError: (Heap Size=131079KB, Allocated=126797KB)
            at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
            at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:658)
            at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:347)
            at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:430)
            at com.ThreeBoots.utils.ImageProcessor$2.doInBackground(ImageProcessor.java:248)
            at com.ThreeBoots.utils.ImageProcessor$2.doInBackground(ImageProcessor.java:245)
            at android.os.AsyncTask$2.call(AsyncTask.java:287)
            at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
            at java.util.concurrent.FutureTask.run(FutureTask.java:137)
            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
            at java.lang.Thread.run(Thread.java:864)

请帮我解决这个问题。谢谢!

Answer 1

您不得将位图直接加载到内存中。定义生成的位图的大小，并使用此处描述的技术加载缩放版本的位图: http://developer.android.com/training/displaying-bitmaps/load-bitmap.html