从图库中获取图像并在ImageView中显示

Question

我需要通过按钮单击从库中获取图像并将其显示在imageview中.

我是按照以下方式进行的:

    btn_image_button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            getImageFromAlbum();
        }
    });

方法定义如下:

   private void getImageFromAlbum(){
    try{
        Intent i = new Intent(Intent.ACTION_PICK,
                android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        startActivityForResult(i, RESULT_LOAD_IMAGE);
    }catch(Exception exp){
        Log.i("Error",exp.toString());
    }
}

活动结果方法是

  @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    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]);
        String picturePath = cursor.getString(columnIndex);
        cursor.close();

        try {
            bmp = getBitmapFromUri(selectedImage);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        image_view.setImageBitmap(bmp);

        //to know about the selected image width and height
        Toast.makeText(MainActivity.this, image_view.getDrawable().getIntrinsicWidth()+" & "+image_view.getDrawable().getIntrinsicHeight(), Toast.LENGTH_SHORT).show();
    }

}

---

问题

我面临的问题是当图像分辨率很高时,假设图像大小为5mp到13mp.它不会加载并显示在图像视图中.

但是宽度和高度较低的图像已成功加载到图像视图中!

有人可以告诉我代码的任何问题以及我做错了什么吗？我只想从图库中导入相机图像并在图像视图中显示它们!

Answer 1

你可以试试这个.

将此代码粘贴到按钮单击事件中.

Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
photoPickerIntent.setType("image/*");
startActivityForResult(photoPickerIntent, RESULT_LOAD_IMG);

以下代码是您的活动结果

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


        if (resultCode == RESULT_OK) {
            try {
                final Uri imageUri = data.getData();
                final InputStream imageStream = getContentResolver().openInputStream(imageUri);
                final Bitmap selectedImage = BitmapFactory.decodeStream(imageStream);
                image_view.setImageBitmap(selectedImage);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
                Toast.makeText(PostImage.this, "Something went wrong", Toast.LENGTH_LONG).show();
            }

        }else {
            Toast.makeText(PostImage.this, "You haven't picked Image",Toast.LENGTH_LONG).show();
        }
    }

它对你有所帮助.

Answer 2

我使用此代码:此代码用于启动图库活动.

Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
photoPickerIntent.setType("image/*");
startActivityForResult(photoPickerIntent, GALLERY_REQUEST);

并获得结果:

@Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(resultCode == Activity.RESULT_OK)
        switch (requestCode){
            case GALLERY_REQUEST:
                Uri selectedImage = data.getData();
                try {
                    Bitmap bitmap = MediaStore.Images.Media.getBitmap(getActivity().getContentResolver(), selectedImage);
                    carImage.setImageBitmap(bitmap);
                } catch (IOException e) {
                    Log.i("TAG", "Some exception " + e);
                }
                break;
        }
    }

并且不要原谅AndroidManifest中的许可.

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

Answer 3

因为OnActivityResult方法已被弃用，现在 AndroidX Activity 的正确方法是Activity Result APIs，推荐的方法，请参阅文档

\n

“ registerForActivityResult()接受一个ActivityResultContract和一个ActivityResultCallback并返回一个ActivityResultLauncher，您\xe2\x80\x99 将使用它来启动其他活动。”

\n

ActivityResultLauncher<String> mGetContent = registerForActivityResult(new ActivityResultContracts.GetContent(),\n    new ActivityResultCallback<Uri>() {\n        @Override\n        public void onActivityResult(Uri uri) {\n            previewImage.setImageURI(uri);\n        }\n     });\n

\n

只需调用

\n

mGetContent.launch("image/*");\n

\n

需要的时候。

\n