Question

我正在研究Android自定义相机应用程序，当我点击图库视图时，它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片显示在我的自定义视图中我该如何实现

  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

当您从照片库中拍摄照片或从照相机返回时，您的height: 100vh方法会调用。因此，请覆盖您的onActivityResult，如下所示

private final ReentrantLock lock  = new ReentrantLock();

编辑：

将图像设置为图像视图

onActivityResult内部

onActivityResult

Answer 2

以下是完整的代码，您可以将requestCode修改为您在代码中声明的内容，并且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;
    }

如何在图像视图中显示图像

2 个答案: