Question

我的应用中有一个带有大图像的图库。我跟着this guide缩小了大图像，使其无法在OOM异常中运行。这适用于Android 2.3+。但由于某些原因，它在Android 2.2中失败了。我发现返回的位图是null！？

这是代码：

protected static Bitmap decodeSampledBitmapFromResource (Resources res,
                                                         int resId,
                                                         int reqWidth,
                                                         int reqHeight)
{

    // First decode with inJustDecodeBounds=true to check dimensions
    final BitmapFactory.Options options = new BitmapFactory.Options ();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeResource (res, resId, options);

    // Calculate inSampleSize
    options.inSampleSize = calculateInSampleSize (options,
                                                  reqWidth,
                                                  reqHeight);

    // Decode bitmap with inSampleSize set
    options.inJustDecodeBounds = false;
    return BitmapFactory.decodeResource (res, resId, options);
}

如果您想检查其他代码，项目将托管在github上。

logcat的：

03-26 13:57:17.724: E/AndroidRuntime(1100): FATAL EXCEPTION: AsyncTask #2
03-26 13:57:17.724: E/AndroidRuntime(1100): java.lang.RuntimeException: An error occured while executing doInBackground()
03-26 13:57:17.724: E/AndroidRuntime(1100):     at android.os.AsyncTask$3.done(AsyncTask.java:200)
03-26 13:57:17.724: E/AndroidRuntime(1100):     at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
03-26 13:57:17.724: E/AndroidRuntime(1100):     at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
03-26 13:57:17.724: E/AndroidRuntime(1100):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
03-26 13:57:17.724: E/AndroidRuntime(1100):     at java.util.concurrent.FutureTask.run(FutureTask.java:137)
03-26 13:57:17.724: E/AndroidRuntime(1100):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)
03-26 13:57:17.724: E/AndroidRuntime(1100):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)
03-26 13:57:17.724: E/AndroidRuntime(1100):     at java.lang.Thread.run(Thread.java:1096)
03-26 13:57:17.724: E/AndroidRuntime(1100): Caused by: java.lang.NullPointerException: key == null || value == null
03-26 13:57:17.724: E/AndroidRuntime(1100):     at android.support.v4.util.LruCache.put(LruCache.java:117)
03-26 13:57:17.724: E/AndroidRuntime(1100):     at com.finger.sciencequiz.MainActivity.addBitmapToMemoryCache(MainActivity.java:84)
03-26 13:57:17.724: E/AndroidRuntime(1100):     at com.finger.sciencequiz.BitmapWorkerTask.doInBackground(BitmapWorkerTask.java:46)
03-26 13:57:17.724: E/AndroidRuntime(1100):     at com.finger.sciencequiz.BitmapWorkerTask.doInBackground(BitmapWorkerTask.java:1)
03-26 13:57:17.724: E/AndroidRuntime(1100):     at android.os.AsyncTask$2.call(AsyncTask.java:185)
03-26 13:57:17.724: E/AndroidRuntime(1100):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
03-26 13:57:17.724: E/AndroidRuntime(1100):     ... 4 more

Answer 1

我最终使用Picasso。它对我来说非常好用，而且非常容易使用。

BitmapFactory.decodeResource在Android 2.2上给出null

1 个答案: