如何从相册中加载图片到图像视图？

Question

我有一个活动，其中包含一个按钮。当我点击该按钮时，它会将我重定向到图像库。我希望在下一个活动中使用图片视图显示所选的图像。但是它没有显示出来。当图像被设置时，该视图已经超出了屏幕范围。

以下是我的选择图像并进入下一个活动的代码。我在我的活动中使用no history true。

  @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);

            }
        });
    }

}

- Nitesh Kabra

---

如果我从清单中删除了“no back history”，则它将显示，但是当我从清单中删除“no back history”时，它会影响其他要求。请帮忙。 - Nitesh Kabra

如果（！（picturePath.equals("")））{ Intent intent = new Intent(); intent.setClass(MainActivity.this, ImageInGellary.class); intent.putExtra("picturePath", picturePath); startActivity(intent); }这是主要问题。 - Nitesh Kabra

由于“nohistory”将删除此活动的上下文，我无法从此活动开始访问图像库。 - Nitesh Kabra

你需要为Android 11做一些额外的工作。请查看此答案：https://dev59.com/Br3pa4cB1Zd3GeqPj7m8#64410689 - Shreemaan Abhishek

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));
             
            }
         
         
        }
    }

为了支持Android 11，您需要在AndroidManifest.xml文件中添加以下代码。

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

- Amit Prajapati

---

这在Android 11中不起作用。请查看此答案。 - Shreemaan Abhishek

Answer 2

如果您想用一行代码实现它，则只需执行以下操作：

Picasso.with(MainActivity.this).load(data.getData()).noPlaceholder().centerCrop().fit().into((ImageView) findViewById(R.id.imageView1));

完整解决方案:-

选择图片

public void pickImage() {

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

}

加载图片

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

            //Get ImageURi and load with help of picasso
            //Uri selectedImageURI = data.getData();

            Picasso.with(MainActivity1.this).load(data.getData()).noPlaceholder().centerCrop().fit()
                    .into((ImageView) findViewById(R.id.imageView1));
        }

    }
}

在您的情况下，您需要将ImageURI传递给下一个活动。

Uri selectedImageURI = data.getData();

- Hitesh Sahu

---

是的，它可以工作，谢谢。但当我从画廊中选择时，它会失败。 - Punithapriya

Picasso可以帮你省去很多麻烦，我建议你使用它，不过还是要尝试从开发者文档中学习如何在UI线程之外加载图片。 - Pedro Varela

这在Android 11中不起作用。请查看此答案。 - Shreemaan Abhishek

Answer 3

public void onClick(View view) {
    Intent gallery = new Intent(Intent.ACTION_GET_CONTENT);
    gallery.setType("image/*");
    startActivityForResult(gallery, 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){
        Uri imageUri = data.getData();
        imgView.setImageURI(imageUri);

    }
}

- A. A. Sumitro

---

你可以通过编辑来更好地解释它的工作方式，从而使这个答案更好。 - dorukayhan

这在Android 11中不起作用。请查看此答案。 - Shreemaan Abhishek

Answer 4

我已经解决了你的问题。在选择图像后，将图像Uri转换为字符串，并在第二个类中将字符串转换回图像。

http://whats-online.info/science-and-tutorials/95/Android-get-image-from-gallery-into-imageview-programmatically/

http://whats-online.info/science-and-tutorials/49/Android-passing-multiple-data-from-one-activity-to-another/

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch(requestCode) {
            case SELECT_PHOTO:
                if(resultCode == RESULT_OK){
                    Uri selectedImage = data.getData();
                    if(selectedImage !=null){
                        Intent intent=new Intent(MainActivity.this, Activity2.class);
                  Bundle extras = new Bundle();
                  extras.putString("image", selectedImage.toString());
                  intent.putExtras(extras);
                  startActivity(intent);

                    }
                }
        }

Activity2.class

  Bundle extras = getIntent().getExtras();
          String name = extras.getString("image");
         Uri imageFinal=Uri.parse(name);

- Daniel Nyamasyo