從SD卡拍攝圖像

Question

當我從sd卡拍攝圖像時，它在我的手機（micromax canvas hd）中可以正常工作，但在銀河系聯系中不起作用。 在銀河系中，它顯示空指針異常。

 if (requestCode == GALLERY_PICTURE) {
            if (resultCode == RESULT_OK) {
                if (data != null) {
                    // our BitmapDrawable for the thumbnail
                    BitmapDrawable bmpDrawable = null;
                    // try to retrieve the image using the data from the intent
                    Cursor cursor = getContentResolver().query(data.getData(),
                            null, null, null, null);
                    if (cursor != null) {

                        cursor.moveToFirst();

                        Uri selectedImageUri = data.getData();

                        selectedImagePath = getPath(selectedImageUri);

                        Log.d("file path","file path name"+selectedImagePath);


                        int idx = cursor.getColumnIndex(ImageColumns.DATA);
                        String fileSrc = cursor.getString(idx);
                        bitmap = BitmapFactory.decodeFile(fileSrc); // load
                                                                            // preview
                                                                            // image
                        bitmap = Bitmap.createScaledBitmap(bitmap,
                                100, 100, false);
                        // bmpDrawable = new BitmapDrawable(bitmapPreview);
                        image.setImageBitmap(bitmap);
                        data1 = null;

這是日志文件-

    12-30 14:37:26.480: E/CursorWindow(14558): Failed to read row 0, column -1 from a CursorWindow which has 1 rows, 6 columns.
12-30 14:37:26.490: E/AndroidRuntime(14558): FATAL EXCEPTION: main
12-30 14:37:26.490: E/AndroidRuntime(14558): Process: com.app.postevery, PID: 14558
12-30 14:37:26.490: E/AndroidRuntime(14558): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { dat=content://com.android.providers.media.documents/document/image:30713 flg=0x1 }} to activity {com.app.postevery/com.app.postevery.PostEvery}: java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow.  Make sure the Cursor is initialized correctly before accessing data from it.
12-30 14:37:26.490: E/AndroidRuntime(14558):    at android.app.ActivityThread.deliverResults(ActivityThread.java:3365)
12-30 14:37:26.490: E/AndroidRuntime(14558):    at android.app.ActivityThread.handleSendResult(ActivityThread.java:3408)
12-30 14:37:26.490: E/AndroidRuntime(14558):    at android.app.ActivityThread.access$1300(ActivityThread.java:135)
12-30 14:37:26.490: E/AndroidRuntime(14558):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1244)
12-30 14:37:26.490: E/AndroidRuntime(14558):    at android.os.Handler.dispatchMessage(Handler.java:102)
12-30 14:37:26.490: E/AndroidRuntime(14558):    at android.os.Looper.loop(Looper.java:136)
12-30 14:37:26.490: E/AndroidRuntime(14558):    at android.app.ActivityThread.main(ActivityThread.java:5017)
12-30 14:37:26.490: E/AndroidRuntime(14558):    at java.lang.reflect.Method.invokeNative(Native Method)
12-30 14:37:26.490: E/AndroidRuntime(14558):    at java.lang.reflect.Method.invoke(Method.java:515)
12-30 14:37:26.490: E/AndroidRuntime(14558):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
12-30 14:37:26.490: E/AndroidRuntime(14558):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
12-30 14:37:26.490: E/AndroidRuntime(14558):    at dalvik.system.NativeStart.main(Native Method)
12-30 14:37:26.490: E/AndroidRuntime(14558): Caused by: java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow.  Make sure the Cursor is initialized correctly before accessing data from it.
12-30 14:37:26.490: E/AndroidRuntime(14558):    at android.database.CursorWindow.nativeGetString(Native Method)
12-30 14:37:26.490: E/AndroidRuntime(14558):    at android.database.CursorWindow.getString(CursorWindow.java:434)
12-30 14:37:26.490: E/AndroidRuntime(14558):    at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:51)
12-30 14:37:26.490: E/AndroidRuntime(14558):    at android.database.CursorWrapper.getString(CursorWrapper.java:114)
12-30 14:37:26.490: E/AndroidRuntime(14558):    at com.app.postevery.PostEvery.onActivityResult(PostEvery.java:548)
12-30 14:37:26.490: E/AndroidRuntime(14558):    at android.app.Activity.dispatchActivityResult(Activity.java:5423)
12-30 14:37:26.490: E/AndroidRuntime(14558):    at android.app.ActivityThread.deliverResults(ActivityThread.java:3361)
12-30 14:37:26.490: E/AndroidRuntime(14558):    ... 11 more

Answer 1

我正在使用以下代碼從sdcard獲取圖像。 此代碼在Nexus 5中正常運行。

   Intent i = new Intent(
                        Intent.ACTION_PICK,
                        android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);  
                startActivityForResult(i, RESULT_LOAD_IMAGE);

onActivityResult（）方法

     protected void onActivityResult(final int requestCode,final int resultCode, final Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    Log.d("Main Activity", "On Activity Result");



    try {
        Uri selectedImage=null;
        if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
            Log.d("Main Activity", "Gallery");
            selectedImage = data.getData();
        }

        if(selectedImage==null)
        {
            Log.d("Main Activity","Back");
            return;
        }

        Log.d("Main Activity","Out");
        String[] filePathColumn = { MediaStore.Images.Media.DATA };
        Cursor cursor = getContentResolver().query(selectedImage,
                filePathColumn, null, null, null);
        cursor.moveToFirst();
        int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
        String picturePath = cursor.getString(columnIndex);
        Log.d("Main Activity",picturePath);
        cursor.close();
        Bitmap bmp=BitmapFactory.decodeFile(picturePath);
        image.setImageBitmap(bmp);
    } catch (Exception e) {
        // TODO Auto-generated catch block
        Log.d("Main Activity","Exception");

    }      


}

Answer 2

我已使用Nexus設備對其進行了檢查。 啟動您的選擇器意圖

Intent intent = new Intent();
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);
        startActivityForResult(Intent.createChooser(intent, ""), GALLERY_PICTURE);

和onActivityResult中的其他代碼相同。 您無需檢查Nexus設備的sdcard，因為Nexus設備具有具有模擬Sdcard路徑的內部存儲。

另一件事是sdcard中的某些文件僅作為URI。 必須首先下載該文件才能從sdcard獲得該文件。 你可以參考這個和這個

Answer 3

這很明顯，因為外部存儲選項不支持Nexus系列。

因此，首先檢查設備是否具有SD卡。

Boolean isSDPresent = android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED);

if(isSDPresent)
{
  // yes SD-card is present

//    Fetch from SD card i.e. Path for SD card

// path = getExternalCacheDir().getAbsolutePath() + "/Folder Name";
}
else
{
 // path = getFilesDir() + "/Folder Name";
}