选择图片意图导致nullpointer异常

Question

 public void uploadpicture(View view)
        {
            Intent intent = new Intent();
            intent.setType("image/*");
            intent.setAction(Intent.ACTION_GET_CONTENT);
            startActivityForResult(Intent.createChooser(intent,
                    "Select Picture"), SELECT_PICTURE);
        }
        public void onActivityResult(int requestCode, int resultCode, Intent data)
            {

            if (resultCode == RESULT_OK)
                 {
                if (requestCode == SELECT_PICTURE) 
                     {

                    Uri selectedImageUri = data.getData();
                    selectedImagePath = getPath(selectedImageUri);
                    Toast.makeText(this,selectedImagePath,Toast.LENGTH_SHORT).show();
                    Log.i("selectedImagePath",selectedImagePath.trim());

                }

            }


        }

我从Log-cat得到了这个:

05-24 15:57:51.054: E/AndroidRuntime(18016): FATAL EXCEPTION: main
05-24 15:57:51.054: E/AndroidRuntime(18016): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { dat=content://com.android.sec.gallery3d.provider/picasa/item/5147009501910019474 }} to activity {ncpl.talentapp/ncpl.talentapp.SignUp}: java.lang.NullPointerException
05-24 15:57:51.054: E/AndroidRuntime(18016):    at android.app.ActivityThread.deliverResults(ActivityThread.java:2821)
05-24 15:57:51.054: E/AndroidRuntime(18016):    at android.app.ActivityThread.handleSendResult(ActivityThread.java:2864)
05-24 15:57:51.054: E/AndroidRuntime(18016):    at android.app.ActivityThread.access$1000(ActivityThread.java:122)
05-24 15:57:51.054: E/AndroidRuntime(18016):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1057)
05-24 15:57:51.054: E/AndroidRuntime(18016):    at android.os.Handler.dispatchMessage(Handler.java:99)
05-24 15:57:51.054: E/AndroidRuntime(18016):    at android.os.Looper.loop(Looper.java:132)
05-24 15:57:51.054: E/AndroidRuntime(18016):    at android.app.ActivityThread.main(ActivityThread.java:4126)
05-24 15:57:51.054: E/AndroidRuntime(18016):    at java.lang.reflect.Method.invokeNative(Native Method)
05-24 15:57:51.054: E/AndroidRuntime(18016):    at java.lang.reflect.Method.invoke(Method.java:491)
05-24 15:57:51.054: E/AndroidRuntime(18016):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:844)
05-24 15:57:51.054: E/AndroidRuntime(18016):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)
05-24 15:57:51.054: E/AndroidRuntime(18016):    at dalvik.system.NativeStart.main(Native Method)
05-24 15:57:51.054: E/AndroidRuntime(18016): Caused by: java.lang.NullPointerException

Answer 1

从您的日志中看起来您正试图从Picasa文件夹中选择一个图像dat=content://com.android.sec.gallery3d.provider/picasa/item/5147009501910019474,并且必须以不同方式处理这些图像,因为MediaStore.Images.Media.DATA列中的数据对于它们将为空.您可以在此链接中查看如何正确处理从Picasa中提取图片:

http://dimitar.me/how-to-get-picasa-images-using-the-image-picker-on-android-devices-running-any-os-version/

只有你还需要处理以"content://com.sec.android.gallery3d"开头的URI(我在三星S3上看到这个)所以改变

if (selectedImage.toString().startsWith("content://com.google.android.gallery3d"))

至

if (_selectedImage.toString().startsWith("content://com.google.android.gallery3d") 
    || selectedImage.toString().startsWith("content://com.sec.android.gallery3d"))

我不确定是否还有其他特殊情况(可能是的).

Answer 2

我遇到了同样的问题,并试图根据推荐的网站user1682516实现这个.因为我的Picasa内容网址并不完全匹配,所以我正撞在墙上:我看起来像"com.sec.android.gallery3d.provider"而不是"com.android.gallery3d.provider"但似乎没有我是否改变了网址.

然后,当我最终意识到我在我的应用程序中使用为ImageViews加载远程图像的库时,我感到愚蠢,https://github.com/nostra13/Android-Universal-Image-Loader,为我处理这个问题.我可以使用适当的参数调用ImageLoader.getInstance().loadImage()并在回调中获取一个Bitmap.我不需要担心它是本地图像,远程Picasa图像还是普通的远程图像 - 这是我照顾的.希望我几个小时前就已经想到了!