如何在图像视图中显示图像

Question

当我点击图库视图时，我正在开发 android 自定义相机应用程序，它显示移动默认图库并显示我点击的照片，但是当我点击图库然后点击图片时，我想要在我的自定义视图中显示如何实现

  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 http://stackoverflow.com/questions/11073832/no-activity-found-to-handle-intent - 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

这里是完整的代码，您可以将requestCode 修改为您在代码中声明的任何内容，您可以在下一个活动中传递 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;
    }

Answer 2

当您在拍照后从相机返回或从图库返回时，您的onActivityResult 方法将调用。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);