的方法工作正常,通過拍攝的圖像返回null內置攝像頭,但對於來自外部的圖像(網頁,一個物理相機等)BitmapFactory.decodeStream(的ImageStream)返回null。有誰知道什麼可能導致錯誤?BitmapFactory.decodeStream一些圖像
這裏是堆棧跟蹤:
07-29 17:25:48.105: E/AndroidRuntime(32296): FATAL EXCEPTION: main
07-29 17:25:48.105: E/AndroidRuntime(32296): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { dat=content://com.google.android.gallery3d.provider/picasa/item/5716149895129356946 flg=0x1 }} to activity {com.example.news_app/com.example.news_app.android.ui.SettingsActivity}: java.lang.NullPointerException
07-29 17:25:48.105: E/AndroidRuntime(32296): at android.app.ActivityThread.deliverResults(ActivityThread.java:3319)
07-29 17:25:48.105: E/AndroidRuntime(32296): at android.app.ActivityThread.handleSendResult(ActivityThread.java:3362)
07-29 17:25:48.105: E/AndroidRuntime(32296): at android.app.ActivityThread.access$1100(ActivityThread.java:141)
07-29 17:25:48.105: E/AndroidRuntime(32296): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1282)
07-29 17:25:48.105: E/AndroidRuntime(32296): at android.os.Handler.dispatchMessage(Handler.java:99)
07-29 17:25:48.105: E/AndroidRuntime(32296): at android.os.Looper.loop(Looper.java:137)
07-29 17:25:48.105: E/AndroidRuntime(32296): at android.app.ActivityThread.main(ActivityThread.java:5041)
07-29 17:25:48.105: E/AndroidRuntime(32296): at java.lang.reflect.Method.invokeNative(Native Method)
07-29 17:25:48.105: E/AndroidRuntime(32296): at java.lang.reflect.Method.invoke(Method.java:511)
07-29 17:25:48.105: E/AndroidRuntime(32296): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
07-29 17:25:48.105: E/AndroidRuntime(32296): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
07-29 17:25:48.105: E/AndroidRuntime(32296): at dalvik.system.NativeStart.main(Native Method)
07-29 17:25:48.105: E/AndroidRuntime(32296): Caused by: java.lang.NullPointerException
07-29 17:25:48.105: E/AndroidRuntime(32296): at android.graphics.Bitmap.createScaledBitmap(Bitmap.java:474)
07-29 17:25:48.105: E/AndroidRuntime(32296): at com.example.news_app.android.ui.SettingsActivity.onActivityResult(SettingsActivity.java:84)
07-29 17:25:48.105: E/AndroidRuntime(32296): at android.app.Activity.dispatchActivityResult(Activity.java:5293)
07-29 17:25:48.105: E/AndroidRuntime(32296): at android.app.ActivityThread.deliverResults(ActivityThread.java:3315)
07-29 17:25:48.105: E/AndroidRuntime(32296): ... 11 more
這裏是我使用的方法:
protected void onActivityResult(int requestCode, int resultCode,
Intent imageReturnedIntent) {
super.onActivityResult(requestCode, resultCode, imageReturnedIntent);
if (requestCode == REQUEST_CODE && resultCode == RESULT_OK) {
Uri selectedImage = imageReturnedIntent.getData();
InputStream imageStream = null;
try {
imageStream = getContentResolver().openInputStream(selectedImage);
} catch (FileNotFoundException e) {
Log.d("onActivityResult", "FileNotFoundException");
e.printStackTrace();
}
Bitmap unscaledImage = BitmapFactory.decodeStream(imageStream);
image = Bitmap.createScaledBitmap(unscaledImage, IMAGE_SIZE, IMAGE_SIZE, false);
Log.d("Unscaled image byte count", "Bytes: " + unscaledImage.getByteCount());
Log.d("Scaled image byte count", "Bytes: " + image.getByteCount());
}
}
謝謝您的幫助!
您可以檢查您的烏里selectedImage不爲空,這些圖像?也許有問題。也可能是圖像已損壞。 – Moy
您應該重新讀取堆棧跟蹤,因爲它與加載位圖無關。看起來你正在嘗試重新查找一個已經關閉的遊標。 – Qberticus
嗨@Moises, 我檢查了URI,它不爲空。例如,路徑是/ picasa/item/5716149895129356946在一個圖像上崩潰。圖像不太可能被破壞,因爲它們來自兩個不同的來源(Google圖片和Picassa),而且相機拍攝的其他圖像正常工作。某些類型的圖像可能不受支持? – cheese1756