android - 如何从画廊的 ImageView 中加载图像？

Question

我有一个 Activity ，它有一个按钮。当我点击按钮时，它会将我重定向到图片库。我想在下一个 Activity 中使用 ImageView 显示所选图像。但它不显示图像。设置图像时， View 不在屏幕上。

下面给出了我选择图像并继续下一步的代码。我在我的 Activity 中没有使用真实的历史。

  @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();
        if (!(picturePath.equals(""))) {
            Intent intent = new Intent();
            intent.setClass(MainActivity.this, ImageInGellary.class);
            intent.putExtra("picturePath", picturePath);
            startActivity(intent);

        }
    }
}

public class ImageInGellary extends Activity {
    Button cancel;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.load_image);
        cancel = (Button) findViewById(R.id.buttonCancelPicture);
        Intent in = getIntent();
        savedInstanceState = in.getExtras();
        String picturePath = savedInstanceState.getString("picturePath");
        ImageView imageView = (ImageView) findViewById(R.id.img_view);
        imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));
        cancel.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {

                /*
                 * Intent i = new Intent(Intent.ACTION_PICK,
                 * android.provider.MediaStore
                 * .Images.Media.EXTERNAL_CONTENT_URI);
                 * 
                 * startActivityForResult(i, RESULT_LOAD_IMAGE);
                 */
                Intent intent = new Intent();
                intent.setClass(ImageInGellary.this, MainActivity.class);
                startActivity(intent);

            }
        });
    }

}

Answer 1

    public class ImageGalleryDemoActivity extends Activity {
         
         
        private static int RESULT_LOAD_IMAGE = 1;
         
     
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);
             
            Button buttonLoadImage = (Button) findViewById(R.id.buttonLoadPicture);
            buttonLoadImage.setOnClickListener(new View.OnClickListener() {
                 
                @Override
                public void onClick(View arg0) {
                     
                    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 (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();
                 
                ImageView imageView = (ImageView) findViewById(R.id.imgView);
                imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));
             
            }
         
         
        }
    }

要支持 android 11，您需要在 AndroidManifest.xml 中添加此代码

        <queries>
            <intent>
                <action android:name="android.intent.action.GET_CONTENT" />
                <data android:mimeType="image/*"/>
            </intent>
        </queries>