BitmapFactory.decodeResource在Android 2.2上给出了空值

我在我的应用程序中有一个画廊，有大图像。我跟着this guide将大图片缩小到不在OOM例外中运行。这适用于Android 2.3+。但由于某些原因，它在Android 2.2中失败。我发现返回的位图是null！？BitmapFactory.decodeResource在Android 2.2上给出了空值

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); 
}

该项目上github托管，如果你想检查的其他代码。

的logcat：

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

来源

2014-03-26 Bhil

所以你传递null作为键或值：“key == null || value == null”，所以在MainActivity行84中改变该值。 – WarrenFaith

是的，值是位图（它是空的）。但它不在Android 2.3以上，我不知道为什么！？ – Bhil

我结束了使用Picasso。它对我来说效果很好，而且使用起来非常简单。

来源

2014-03-30 13:55:18 Bhil

BitmapFactory.decodeResource在Android 2.2上给出了空值

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