从图库中获取图像并在ImageView中显示

时间:2016-07-13 12:45:19

标签: android android-intent imageview android-gallery

我需要通过点击按钮从图库中获取图像并将其显示在图像视图中。

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,假设图像尺寸为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?我只是想从图库中导入相机图像并在图像视图中显示它们!

4 个答案:

答案 0 :(得分:61)

你可以试试这个。

将此代码粘贴到按钮点击事件中。

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();
        }
    }

对你有帮助。

答案 1 :(得分:10)

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);

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"/>

答案 2 :(得分:0)

我尝试了上述所有解决方案,但它们对我不起作用。我从 tutorialspoint 网站上看到了一个代码,它对我很有效,这是代码:

    final int PICK_IMAGE = 100;

    Button button = findViewById(R.id.button33);
    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent gallery = new Intent(Intent.ACTION_PICK,
             MediaStore.Images.Media.INTERNAL_CONTENT_URI);
             startActivityForResult(gallery, PICK_IMAGE);
        }
    });


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

    Uri imageUri;
    ImageView imageView = findViewById(R.id.image_main_galary);

    if (resultCode == RESULT_OK && reqCode == 100){
        imageUri = data.getData();
        imageView.setImageURI(imageUri);
    }
    }

最重要的问题:不要忘记权限

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

答案 3 :(得分:0)

因为 OnActivityResult 方法已被弃用,现在使用 AndroidX Activity 的正确方法是 Activity Result API,而推荐的方法是 see docs

"registerForActivityResult() 接受一个 ActivityResultContract 和一个 ActivityResultCallback 并返回一个您将使用的 ActivityResultLauncher启动其他活动。”

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

只需调用

mGetContent.launch("image/*");

需要时。