ODK采集图像质量

Question

由于现在的智能手机配备了1600万像素的摄像头，图片尺寸也将达到5MB。将它们上传到移动数据上会花费一些时间和更多的数据，导致App的性能较差。

ODK collect有没有办法将图像问题调整到指定的尺寸和质量。

这将有助于提高App的性能。

Answer 1

看看ImageWidget.java

ODK Collect会根据屏幕大小调整大小，但您可以更改

int screenWidth = display.getWidth();
int screenHeight = display.getHeight();

到一个固定的最大分辨率。

    // Only add the imageView if the user has taken a picture
    if (mBinaryName != null) {
        mImageView = new ImageView(getContext());
        mImageView.setId(QuestionWidget.newUniqueId());
        Display display =
            ((WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE))
                    .getDefaultDisplay();
        int screenWidth = display.getWidth();
        int screenHeight = display.getHeight();

        File f = new File(mInstanceFolder + File.separator + mBinaryName);

        if (f.exists()) {
            Bitmap bmp = FileUtils.getBitmapScaledToDisplay(f, screenHeight, screenWidth);
            if (bmp == null) {
                mErrorTextView.setVisibility(View.VISIBLE);
            }
            mImageView.setImageBitmap(bmp);
        } else {
            mImageView.setImageBitmap(null);
        }

        mImageView.setPadding(10, 10, 10, 10);
        mImageView.setAdjustViewBounds(true);
        mImageView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                    Collect.getInstance().getActivityLogger().logInstanceAction(this, "viewButton", 
                                    "click", mPrompt.getIndex());
                Intent i = new Intent("android.intent.action.VIEW");
                Uri uri = MediaUtils.getImageUriFromMediaProvider(mInstanceFolder + File.separator + mBinaryName);
                    if ( uri != null ) {
                    Log.i(t,"setting view path to: " + uri);
                    i.setDataAndType(uri, "image/*");
                    try {
                        getContext().startActivity(i);
                    } catch (ActivityNotFoundException e) {
                        Toast.makeText(getContext(),
                            getContext().getString(R.string.activity_not_found, "view image"),
                            Toast.LENGTH_SHORT).show();
                    }
                }
            }
        });