我在其下面有一个LinearLayout和一个RecyclerView。在Google上搜索时，我发现了一些代码来截取RecyclerView的屏幕截图（说实话，我不明白它是如何工作的）。这是代码：
public static Bitmap getRecyclerViewScreenshot(RecyclerView view) {
int size = view.getAdapter().getItemCount();
RecyclerView.ViewHolder holder = view.getAdapter().createViewHolder(view, 0);
view.getAdapter().onBindViewHolder(holder, 0);
holder.itemView.measure(View.MeasureSpec.makeMeasureSpec(view.getWidth(), View.MeasureSpec.EXACTLY),
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
holder.itemView.layout(0, 0, holder.itemView.getMeasuredWidth(), holder.itemView.getMeasuredHeight());
Bitmap bigBitmap = Bitmap.createBitmap(view.getMeasuredWidth(), holder.itemView.getMeasuredHeight() * size,
Bitmap.Config.ARGB_8888);
Canvas bigCanvas = new Canvas(bigBitmap);
bigCanvas.drawColor(Color.WHITE);
Paint paint = new Paint();
int iHeight = 0;
holder.itemView.setDrawingCacheEnabled(true);
holder.itemView.buildDrawingCache();
bigCanvas.drawBitmap(holder.itemView.getDrawingCache(), 0f, iHeight, paint);
holder.itemView.setDrawingCacheEnabled(false);
holder.itemView.destroyDrawingCache();
iHeight += holder.itemView.getMeasuredHeight();
try {
for (int i = 1; i < size; i++) {
view.getAdapter().onBindViewHolder(holder, i);
holder.itemView.setDrawingCacheEnabled(true);
holder.itemView.buildDrawingCache();
bigCanvas.drawBitmap(holder.itemView.getDrawingCache(), 0f, iHeight, paint);
iHeight += holder.itemView.getMeasuredHeight();
holder.itemView.setDrawingCacheEnabled(false);
holder.itemView.destroyDrawingCache();
}
} catch (Exception e) {
}
return bigBitmap;
}
现在，我也想在其中添加LinearLayout，它位于RecyclerView的上方。由于我无法理解代码，因此无法修改它以包含LinearLayout。我不明白的是与位图有关的术语，例如Canvas，DrawingCache。因此，如果任何人都可以提供一些基本信息，那就太好了。还可以帮助我在处理后的位图中包含linearlayout。
最佳答案
您可以轻松地做到这一点，无需在适配器类中进行编码，而将在活动类中完成，也可以获取滚动视图类型的活动的屏幕快照。只需要找到在其中声明了RecycleView的布局ID即可XML.i发布了完整的活动，您只需要找到代码初始化即可，此代码可用于recycleview以及嵌套的滚动视图
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_download:
Bitmap bitmap1 = getBitmapFromView(ll_linear);
Log.e("ll_linear", "" + ll_linear.getWidth());
Log.e("ll_linear", "" + ll_linear.getHeight());
saveBitmap(bitmap1);
break;
}
}
public void saveBitmap(Bitmap bitmap) {
isStoragePermissionGranted(bitmap);
}
public boolean isStoragePermissionGranted(Bitmap bitmap) {
Date now = new Date();
android.text.format.DateFormat.format("yyyy-MM-dd_hh:mm:ss", now);
String mPath = Environment.getExternalStorageDirectory().toString() + "/" + now + ".jpg";
Log.e("mpath", mPath);
File imagePath = new File(mPath);
FileOutputStream fos;
if (Build.VERSION.SDK_INT >= 23) {
if (checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE)
== PackageManager.PERMISSION_GRANTED) {
try {
fos = new FileOutputStream(imagePath);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);
fos.flush();
fos.close();
Toast.makeText(getApplicationContext(), imagePath.getAbsolutePath() + "", Toast.LENGTH_SHORT).show();
boolean_save = true;
btn_download.setText("Check image");
} catch (FileNotFoundException e) {
Log.e("Exception", "" + e);
} catch (IOException e) {
Log.e("Exception", "" + e);
}
Log.v("Tag", "Permission is granted");
return true;
} else {
Log.v("Tag", "Permission is revoked");
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
return false;
}
} else { //permission is automatically granted on sdk<23 upon installation
File imagePath1 = new File("/sdcard/screenshotdemo.jpg");
FileOutputStream fos1;
try {
fos1 = new FileOutputStream(imagePath1);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos1);
fos1.flush();
fos1.close();
Toast.makeText(getApplicationContext(), imagePath1.getAbsolutePath() + "", Toast.LENGTH_SHORT).show();
boolean_save = true;
btn_download.setText("Check image");
} catch (FileNotFoundException e) {
Log.e("Exception", "" + e);
} catch (IOException e) {
Log.e("Exception", "" + e);
}
Log.v("Tag", "Permission is granted");
return true;
}
}
public static Bitmap getBitmapFromView(View view) {
//Define a bitmap with the same size as the view
Bitmap returnedBitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888);
//Bind a canvas to it
Canvas canvas = new Canvas(returnedBitmap);
//Get the view's background
Drawable bgDrawable = view.getBackground();
if (bgDrawable != null)
//has background drawable, then draw it on the canvas
bgDrawable.draw(canvas);
else
//does not have background drawable, then draw white background on the canvas
canvas.drawColor(Color.WHITE);
// draw the view on the canvas
view.draw(canvas);
//return the bitmap
return returnedBitmap;
}
关于android - 拍摄LinearLayout和RecyclerView的屏幕截图，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/45421252/