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android - 捕获视图的屏幕截图后如何完成活动？

问题描述

我需要使用子视图的屏幕截图关闭活动。

这是我的代码片段：

private void returnBackWithSavedImage() {
    int permissionCheck = PermissionChecker.checkCallingOrSelfPermission(this,
            android.Manifest.permission.WRITE_EXTERNAL_STORAGE);

    if (permissionCheck == PackageManager.PERMISSION_GRANTED) {
        // Hide top/bottom sub views
        updateView(View.GONE);
        RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(
                RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
        layoutParams.addRule(RelativeLayout.CENTER_IN_PARENT, RelativeLayout.TRUE);
        parentImageRelativeLayout.setLayoutParams(layoutParams);
        new CountDownTimer(1000, 500) {
            public void onTick(long millisUntilFinished) {

            }

            public void onFinish() {
                byte[] byteArray = null;
                try {
                    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
                    if (parentImageRelativeLayout != null) {
                        parentImageRelativeLayout.setDrawingCacheEnabled(true);
                        parentImageRelativeLayout.getDrawingCache().compress(Bitmap.CompressFormat.JPEG, 80, byteArrayOutputStream);
                        byteArray = byteArrayOutputStream .toByteArray();
                    }

                    byteArrayOutputStream.flush();
                    byteArrayOutputStream.close();
                } catch (Exception var7) {
                    var7.printStackTrace();
                }
                Intent returnIntent = new Intent();
                if (byteArray != null) {
                    String imgString = Base64.encodeToString(byteArray, Base64.NO_WRAP);
                    returnIntent.putExtra("image", imgString);
                }
                setResult(Activity.RESULT_OK, returnIntent);
                finish();
            }
        }.start();
        //Toast.makeText(this, getString(R.string.save_image_succeed), Toast.LENGTH_SHORT).show();
    } else {
        showPermissionRequest();
    }
}

问题是finish();被调用但活动从未关闭。如果我运行以下代码，它将关闭活动。

private void returnBackWithSavedImage() {
    int permissionCheck = PermissionChecker.checkCallingOrSelfPermission(this,
            android.Manifest.permission.WRITE_EXTERNAL_STORAGE);

    if (permissionCheck == PackageManager.PERMISSION_GRANTED) {
        Intent returnIntent = new Intent();
        setResult(Activity.RESULT_OK, returnIntent);
        finish();
    } else {
        showPermissionRequest();
    }
}

我整天都在努力解决这个问题，但我真的无法解决。

我很感激任何帮助。

非常感谢您在这件事上的时间和帮助。

标签： androidandroid-studioandroid-activity

解决方案

只需将图像捕获过程转移到方法即可解决问题。看起来CountDownTimer onFinish()没有在 UI 线程中运行。

因此，将您的代码更改为以下内容：

private void returnBackWithSavedImage() {
    int permissionCheck = PermissionChecker.checkCallingOrSelfPermission(this,
            android.Manifest.permission.WRITE_EXTERNAL_STORAGE);

    if (permissionCheck == PackageManager.PERMISSION_GRANTED) {

        ...

        new CountDownTimer(1000, 500) {
            public void onTick(long millisUntilFinished) {

            }

            public void onFinish() {
                captureImage();
            }
        }.start();
        ...
    } else {
        showPermissionRequest();
    }
}

private void captureImage() {

    byte[] byteArray = null;
    try {
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        if (parentImageRelativeLayout != null) {
            parentImageRelativeLayout.setDrawingCacheEnabled(true);
            parentImageRelativeLayout.getDrawingCache().compress(Bitmap.CompressFormat.JPEG, 80, byteArrayOutputStream);
            byteArray = byteArrayOutputStream .toByteArray();
        }

        byteArrayOutputStream.flush();
        byteArrayOutputStream.close();
    } catch (Exception var7) {
        var7.printStackTrace();
    }
    Intent returnIntent = new Intent();
    if (byteArray != null) {
        String imgString = Base64.encodeToString(byteArray, Base64.NO_WRAP);
        returnIntent.putExtra("image", imgString);
    }
    setResult(Activity.RESULT_OK, returnIntent);
    finish();
}

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