如何在图像视图中显示图像

Question

我正在开发 android 自定义相机应用程序，当我点击图库视图时，它会显示移动默认图库并显示我点击的照片，但我想要当我点击图库然后点击图像时在我的自定义视图中显示我该如何实施

  public void clickedGallery(View view) {
    if (MyDebug.LOG)
        Log.d(TAG, "clickedGallery");
    //Intent intent = new Intent(Intent.ACTION_VIEW, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
    Uri uri = null;
    Media media = getLatestMedia();
    if (media != null) {
        uri = media.uri;
    }

    if (uri != null) {
        // check uri exists
        if (MyDebug.LOG)
            Log.d(TAG, "found most recent uri: " + uri);
        try {
            ContentResolver cr = getContentResolver();
            ParcelFileDescriptor pfd = cr.openFileDescriptor(uri, "r");
            if (pfd == null) {
                if (MyDebug.LOG)
                    Log.d(TAG, "uri no longer exists (1): " + uri);
                uri = null;
            }
            pfd.close();
        } catch (IOException e) {
            if (MyDebug.LOG)
                Log.d(TAG, "uri no longer exists (2): " + uri);
            uri = null;
        }
    }
    if (uri == null) {
        uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
    }
    if (!is_test) {
        // don't do if testing, as unclear how to exit activity to finish test (for testGallery())
        if (MyDebug.LOG)
            Log.d(TAG, "launch uri:" + uri);
        final String REVIEW_ACTION = "com.android.camera.action.REVIEW";
        try {
            // REVIEW_ACTION means we can view video files without autoplaying
            Intent intent = new Intent(REVIEW_ACTION, uri);
            this.startActivity(intent);
        } catch (ActivityNotFoundException e) {
            if (MyDebug.LOG)
                Log.d(TAG, "REVIEW_ACTION intent didn't work, try ACTION_VIEW");
            Intent intent = new Intent(Intent.ACTION_VIEW, uri);
            // from  - needed to fix crash if no gallery app installed
            //Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("blah")); // test
            if (intent.resolveActivity(getPackageManager()) != null) {
                this.startActivity(intent);
            } else {
                preview.showToast(null, R.string.no_gallery_app);
            }
        }
    }
}

Answer 1

当您在拍照后从相机返回或从画廊返回时，您的 onActivityResult 方法将被调用。所以像下面这样覆盖你的 onActivityResult

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);
         if (resultCode == RESULT_OK) {
   //Read your image here and set in your imageView 
}
    }

编辑：

将图像设置为图像视图

onActivityResult 内部

if(data.getData()==null){
    bitmap = (Bitmap)data.getExtras().get("data");
}else{
    bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), data.getData());
}

yourImageView.setImageBitmap(img);

Answer 2

这是完整的代码，您可以将 requestCode 修改为您在代码中声明的任何内容，您可以在下一个 activity 中传递 Uri 或文件的实际位置.

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode != RESULT_CANCELED) {
            if (requestCode == SELECT_FILE && (data != null)) {
                Uri selectedImageUri = data.getData();
                String[] projection = {MediaStore.MediaColumns.DATA};
                Cursor cursor = getContentResolver().query(selectedImageUri, projection, null, null,
                        null);
                assert cursor != null;
                int column_index = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA);
                cursor.moveToFirst();

                String selectedImagePath = cursor.getString(column_index);
                if(selectedImagePath == null) {
                    selectedImagePath = getActualPathFromUri(selectedImageUri);
                }
                cursor.close();
            } else {
                super.onActivityResult(requestCode, resultCode, data);
            }
        }
    }

    private String getActualPathFromUri(Uri selectedImageUri) {
        Bitmap bitmap = null;
        try {
            bitmap = getBitmapFromUri(selectedImageUri);
        } catch (IOException e) {
            e.printStackTrace();
        }
        if(bitmap == null) {
            return null;
        }

        File imageFileFolder = new File(getCacheDir(),"appName");
        if( !imageFileFolder.exists() ){
            imageFileFolder.mkdir();
        }

        FileOutputStream out = null;

        File imageFileName = new File(imageFileFolder, "appName-" + System.currentTimeMillis() + ".jpg");
        try {
            out = new FileOutputStream(imageFileName);
            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out);
            out.flush();
            out.close();
        } catch (IOException e) {
            Log.i("Exception", e.getMessage());
        } finally {
            if(out != null) {
                try {
                    out.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return imageFileName.getAbsolutePath();
    }

    private Bitmap getBitmapFromUri(Uri uri) throws IOException {
        ParcelFileDescriptor parcelFileDescriptor =
                getContentResolver().openFileDescriptor(uri, "r");
        assert parcelFileDescriptor != null;
        FileDescriptor fileDescriptor = parcelFileDescriptor.getFileDescriptor();
        Bitmap image = BitmapFactory.decodeFileDescriptor(fileDescriptor);
        parcelFileDescriptor.close();
        return image;
    }

如何在图像视图中显示图像

how to show image in image view

android

android-intent

android-camera

android-gallery