Android intent-从图库中选择图像

我遵循这一点，以发送一个意图，以获得一个图像

Intent i = new Intent();
i.setAction(Intent.ACTION_GET_CONTENT);

i.setType("image/*");

if (i.resolveActivity(getPackageManager()) != null) {
     startActivityForResult(i, 3);
}

在onActivityResult中：

发送意图后，图像选择器启动，我在库中选择一个图像。但在onActivityResult中，对应于示例代码中的以下语句，我在Android 4.4中更改为getParcelableExtra：

Bitmap thumbnail = data.getParcelable("data");

我得到的缩略图为空。我正在测试Genymotion虚拟机

我做错了什么？你能试试他的答案吗？

使用getData而不是getParcelableExtra

它将返回一个Uri，您需要使用ContentResolver来获取图像

另外，用Intent.ACTION\u PICK代替Intent.ACTION\u GET\u CONTENT。

你能试试他的答案吗？

使用getData而不是getParcelableExtra

它将返回一个Uri，您需要使用ContentResolver来获取图像

---

另外，请使用Intent.ACTION\u PICK而不是Intent.ACTION\u GET\u CONTENT。

从数据中获取URI并自己加载位图，而不是获取位图

           Uri selectedImageUri = data.getData();
           String selectedImagePath = getPath(selectedImageUri);

---

不要获取位图，而是从数据中获取URI并自己加载位图

           Uri selectedImageUri = data.getData();
           String selectedImagePath = getPath(selectedImageUri);

试试这个。。 这对你有帮助

  /**
                     * Images uploaded through gallery
                     * 
                     */

                    btn_gallery.setOnClickListener(new OnClickListener()
                    {

                        @Override
                        public void onClick(View v)
                        {
                            if (v.getId() == R.id.btn_gallery)
                            {
                                upload = true;
                                gallery_upload();


                            }

                        }
                    });



     /**
             * By this method we can upload the image from gallery
             */
            public void gallery_upload()
            {
                Log.d("Upload", "inside gallery upload");
                Intent i = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

                startActivityForResult(i, RESULT_LOAD_IMAGE);

            }

    @Override
        protected void onActivityResult(int requestCode, int resultCode, Intent data)
        {
            super.onActivityResult(requestCode, resultCode, data);

            if (upload)
            {
                if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data)
                {
                    Uri selectedImage = data.getData();
                    String[] filePathColumn = { MediaStore.Images.Media.DATA };

                    Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);
                    cursor.moveToFirst();

                    int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
                    picturePath = cursor.getString(columnIndex);
                    Log.e("", "" + picturePath);
                    cursor.close();

                    imageView = (ImageView) findViewById(R.id.upload_register_image);

                    File image = new File(picturePath);
                    if (image.exists())
                    {
                        File f = image.getAbsoluteFile();
                        decodeFile(f);
                    }
                    else
                    {
                        Log.d("VEHICLEREGISTERATION", "image doesnt exist");
                    }

                    upload = false;

                    imagePath(picturePath);

                }
    }
    }
/**
 * Helps to decode size of the image
 * */
private Bitmap decodeFile(File f)
{
    try
    {
        // Decode image size
        BitmapFactory.Options o = new BitmapFactory.Options();
        o.inJustDecodeBounds = true;
        BitmapFactory.decodeStream(new FileInputStream(f), null, o);

        // The new size we want to scale to
        final int REQUIRED_SIZE = 70;

        // Find the correct scale value. It should be the power of 2.
        int scale = 1;
        while (o.outWidth / scale / 2 >= REQUIRED_SIZE && o.outHeight / scale / 2 >= REQUIRED_SIZE)
            scale *= 2;

        // Decode with inSampleSize
        BitmapFactory.Options o2 = new BitmapFactory.Options();
        o2.inSampleSize = scale;
        Bitmap bit_map = BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
        imageView.setImageBitmap(bit_map);

    }
    catch (FileNotFoundException e)
    {
    }
    return null;
}

public void imagePath(String Path)
{
    finalImgPath = Path;

}

试试这个。。 这对你有帮助

  /**
                     * Images uploaded through gallery
                     * 
                     */

                    btn_gallery.setOnClickListener(new OnClickListener()
                    {

                        @Override
                        public void onClick(View v)
                        {
                            if (v.getId() == R.id.btn_gallery)
                            {
                                upload = true;
                                gallery_upload();


                            }

                        }
                    });



     /**
             * By this method we can upload the image from gallery
             */
            public void gallery_upload()
            {
                Log.d("Upload", "inside gallery upload");
                Intent i = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

                startActivityForResult(i, RESULT_LOAD_IMAGE);

            }

    @Override
        protected void onActivityResult(int requestCode, int resultCode, Intent data)
        {
            super.onActivityResult(requestCode, resultCode, data);

            if (upload)
            {
                if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data)
                {
                    Uri selectedImage = data.getData();
                    String[] filePathColumn = { MediaStore.Images.Media.DATA };

                    Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);
                    cursor.moveToFirst();

                    int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
                    picturePath = cursor.getString(columnIndex);
                    Log.e("", "" + picturePath);
                    cursor.close();

                    imageView = (ImageView) findViewById(R.id.upload_register_image);

                    File image = new File(picturePath);
                    if (image.exists())
                    {
                        File f = image.getAbsoluteFile();
                        decodeFile(f);
                    }
                    else
                    {
                        Log.d("VEHICLEREGISTERATION", "image doesnt exist");
                    }

                    upload = false;

                    imagePath(picturePath);

                }
    }
    }
/**
 * Helps to decode size of the image
 * */
private Bitmap decodeFile(File f)
{
    try
    {
        // Decode image size
        BitmapFactory.Options o = new BitmapFactory.Options();
        o.inJustDecodeBounds = true;
        BitmapFactory.decodeStream(new FileInputStream(f), null, o);

        // The new size we want to scale to
        final int REQUIRED_SIZE = 70;

        // Find the correct scale value. It should be the power of 2.
        int scale = 1;
        while (o.outWidth / scale / 2 >= REQUIRED_SIZE && o.outHeight / scale / 2 >= REQUIRED_SIZE)
            scale *= 2;

        // Decode with inSampleSize
        BitmapFactory.Options o2 = new BitmapFactory.Options();
        o2.inSampleSize = scale;
        Bitmap bit_map = BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
        imageView.setImageBitmap(bit_map);

    }
    catch (FileNotFoundException e)
    {
    }
    return null;
}

public void imagePath(String Path)
{
    finalImgPath = Path;

}