I am trying to setwallpaper from my class which extends view superclass , i am trying to convert view into the bitmap but i am getting an error (NullPointerException).
case R.id.wallpaper: // This is an event of my button
View view = new CustomWallpaper(this);
b = convertToBitmap(view);
WallpaperManager myWallpaperManager
= WallpaperManager.getInstance(getApplicationContext());
try {
myWallpaperManager.setBitmap(b);
new CustomToast(context, "Wallpaper has been set").show();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
and this is my method
private Bitmap convertToBitmap(View view) {
// TODO Auto-generated method stub
Bitmap viewCapture = null;
view.setDrawingCacheEnabled(true);
viewCapture = Bitmap.createBitmap(view.getDrawingCache());
view.setDrawingCacheEnabled(false);
return viewCapture;
}
And this is my class which extends view
public class CustomWallpaper extends View {
public CustomWallpaper(Context context) {
super(context);
// TODO Auto-generated constructor stub
setBackgroundColor(Color.BLACK);
LayoutParams params = new LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT);
setLayoutParams(params);
}
#SuppressLint("DrawAllocation")
#Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
Paint paint = new Paint();
paint.setColor(Color.RED);
canvas.drawCircle(50, 50, 30, paint);
}
}
Thank You
Bitmap returnedBitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(returnedBitmap);
Drawable bgDrawable = view.getBackground();
if (bgDrawable != null) {
bgDrawable.draw(canvas);
} else {
canvas.drawColor(Color.WHITE);
}
view.draw(canvas);
and your bitmap is returnedBitmap
then no need to create CustomView. try this. it may help you...
public void onClick(View view) {
switch (view.getId()) {
case R.id.wallpaper:
Bitmap bitmap = getWallPaperBitmap();
.......
wallPaperManager.setBitmap(bitmap);
break;
default:
break;
}
}
public static Bitmap getWallPaperBitmap() {
Bitmap bitmap = Bitmap.createBitmap(50, 50, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
canvas.drawARGB(0, 0, 0, 0);
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setColor(Color.RED);
// this style will fill the circle
paint.setStyle(Paint.Style.FILL);
// this style will draw Circle path.
paint.setStyle(Paint.Style.STROKE);
canvas.drawCircle(bitmap.getWidth()/2, bitmap.getHeight()/2, 40, paint);
return bitmap;
}
Related
I am fetching a Bitmap with Parse on my Android application.
final WeakReference<ImageView> weakImageView = new WeakReference<>(imageViewToMask);
fetchFromParse(getContext(), new Success() {
#Override
public void success(Bitmap image) {
if (weakImageView.get() != null) {
// Here how to make this image a MaskDrawable to mask it?
// MaskedDrawable d = new MaskedDrawable(bitmap, context, [canvas here]?)
// weakImageView.get().setImageDrawable(d);
weakImageView.get().setImageDrawable(image);
}
}
});
Now I want to mask this bitmap with another image, I found this answer in this thread:
public class MaskedDrawable extends Drawable {
public void draw(Bitmap original, Context context, Canvas canvas) {
Bitmap mask = BitmapFactory.decodeResource(context.getResources(), R.drawable.mask_image);
Bitmap result = Bitmap.createBitmap(mask.getWidth(), mask.getHeight(), Config.ARGB_8888);
Canvas tempCanvas = new Canvas(result);
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
tempCanvas.drawBitmap(original, 0, 0, null);
tempCanvas.drawBitmap(mask, 0, 0, paint);
paint.setXfermode(null);
// How do I create this canvas user here?
canvas.drawBitmap(result, 0, 0, new Paint());
}
}
I already have the original bitmap and the context object, but I don't know how to use canvas. What to do?
Thanks for your help!
If your activity has too much content and display a very long ui, like containing a ListView or WebView,
How can we get a screenshot containing the whole content within a long image?
I think the answer in this link can help you:
How to convert all content in a scrollview to a bitmap?
I mixed two answers in the link above to make an optimized piece of code for you:
private void takeScreenShot()
{
View u = ((Activity) mContext).findViewById(R.id.scroll);
HorizontalScrollView z = (HorizontalScrollView) ((Activity) mContext).findViewById(R.id.scroll);
int totalHeight = z.getChildAt(0).getHeight();
int totalWidth = z.getChildAt(0).getWidth();
Bitmap b = getBitmapFromView(u,totalHeight,totalWidth);
//Save bitmap
String extr = Environment.getExternalStorageDirectory()+"/Folder/";
String fileName = "report.jpg";
File myPath = new File(extr, fileName);
FileOutputStream fos = null;
try {
fos = new FileOutputStream(myPath);
b.compress(Bitmap.CompressFormat.JPEG, 100, fos);
fos.flush();
fos.close();
MediaStore.Images.Media.insertImage(mContext.getContentResolver(), b, "Screen", "screen");
}catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static Bitmap getBitmapFromView(View view, int totalHeight, int totalWidth) {
int height = Math.min(MAX_HEIGHT, totalHeight);
float percent = height / (float)totalHeight;
Bitmap canvasBitmap = Bitmap.createBitmap((int)(totalWidth*percent),(int)(totalHeight*percent), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(canvasBitmap);
Drawable bgDrawable = view.getBackground();
if (bgDrawable != null)
bgDrawable.draw(canvas);
else
canvas.drawColor(Color.WHITE);
canvas.save();
canvas.scale(percent, percent);
view.draw(canvas);
canvas.restore();
return canvasBitmap;
}
Try using this,
Pass your view to this function,
public Bitmap getBitmapFromView(View view) {
// Define a bitmap with the same size as the view
Bitmap returnedBitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(), Bitmap.Config.RGB_565);
// 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;
}
This function will return a bitmap, you can utilize it the way you want.
You can easily convert layout into "bitmap image"
protected Bitmap ConvertToBitmap(LinearLayout layout) {
layout.setDrawingCacheEnabled(true);
layout.buildDrawingCache();
Bitmap bitmap = layout.getDrawingCache();
return bitmap;
}
I need to convert TextView to bitmap. TextView has transparency using the setAlpha() method. I am using following code
Bitmap b = getBitmapFromView(textView , 150);
try {
b.compress(Bitmap.CompressFormat.PNG, 95, new FileOutputStream(watermarkImagePath));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
public Bitmap getBitmapFromView(View view, int alpha) {
view.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
Bitmap bitmap = Bitmap.createBitmap(view.getMeasuredWidth(), view.getMeasuredHeight(),
Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
Paint alphaPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
alphaPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_OUT));
alphaPaint.setColor(Color.TRANSPARENT);
Toast.makeText(VideoCaptureActivity.this, "alpha" + alpha, Toast.LENGTH_LONG).show();
alphaPaint.setAlpha(alpha);
canvas.drawBitmap(bitmap,0,0,alphaPaint);
view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());
view.draw(canvas);
return bitmap;
}
but the issue is that the result image has no transparency :(
After trying different techniques what worked for me was to make bitmap from view with full opacity and then set tranparency of bitmap. Hope it will help others having same issue
Bitmap b = addTranparencyToBitmap(getBitmapFromView(view), (int)( view.getAlpha() * 255));
try {
b.compress(Bitmap.CompressFormat.PNG, 95, new FileOutputStream(watermarkImagePath));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
public Bitmap getBitmapFromView(View view) {
Bitmap bitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(),
Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
view.draw(canvas);
return bitmap;
}
public Bitmap addTranparencyToBitmap(Bitmap originalBitmap, int alpha) {
Bitmap newBitmap = Bitmap.createBitmap(originalBitmap.getWidth(), originalBitmap.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(newBitmap);
Paint alphaPaint = new Paint();
alphaPaint.setAlpha(alpha);
canvas.drawBitmap(originalBitmap, 0, 0, alphaPaint);
return newBitmap;
}
I want to capture image of surface view with content draw on surface view.
I n my app i have surface view on which user can draw some bitmap by drag and drop some objects on it.
After that on a button click i want to store image of that surfaceview with its bitmap content in sd card.
For these i have a canvas object and all bitmap are draw on it.
below is my code -
mHolder = mSurfaceView.getHolder();
mHolder.lockCanvas();
canvas.drawColor(0,Mode.CLEAR);
//border's properties
paint = new Paint();
FontMetrics fm = new FontMetrics();
Paint paint2 = new Paint();
paint2.setColor(Color.WHITE);
paint2.setTextSize(30);
paint2.setTextAlign(Paint.Align.CENTER);
paint2.getFontMetrics(fm);
canvas.drawText("Building", RectLeft+60, RectTop+60, paint2);
paint.setStyle(Paint.Style.STROKE);
paint.setColor(color);
paint.setStrokeWidth(3);
canvas.drawRect(RectLeft, RectTop, RectRight, RectBottom, paint);
mHolder.unlockCanvasAndPost(canvas);
How to do that.
Thanks in advance.
EDITED
Below is my code that captures only view that i have created in xml and not draw what i have draw on surface.
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;
}
EDITED my hole fragment for drawing is below-
public class DrawingLayoutFragment extends Fragment implements SurfaceHolder.Callback{
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
....
....
mSurfaceView = (SurfaceView) view.findViewById(R.id.surfaceview);
init();
return view;
}
public void init(){
mSurfaceView.getHolder().addCallback(this);
}
#Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
RectLeft = width/2 - 60;
RectTop = height/2 - 60 ;
RectRight = width/2 + 60;
RectBottom = height/2 + 60;
DrawFocusRect(RectLeft, RectTop, RectRight, RectBottom, getResources().getColor(com.nep.R.color.white_color));
}
#Override
public void surfaceCreated(SurfaceHolder holder) {
mHolder = mSurfaceView.getHolder();
}
#Override
public void surfaceDestroyed(SurfaceHolder holder) {
try{
if(mHolder!=null){
mHolder.lockCanvas();
canvas = null;
mHolder.addCallback(null);
mHolder = null;
}
}catch(Exception e){
e.printStackTrace();
}
}
private void DrawFocusRect(float RectLeft, float RectTop, float RectRight, float RectBottom, int color){
try {
if(canvas!=null){
mHolder.lockCanvas();
}
else{
canvas = mHolder.lockCanvas();
}
canvas.drawColor(0,Mode.CLEAR);
paint = new Paint();
FontMetrics fm = new FontMetrics();
Paint paint2 = new Paint();
paint2.setColor(Color.WHITE);
paint2.setTextSize(30);
paint2.setTextAlign(Paint.Align.CENTER);
paint2.getFontMetrics(fm);
canvas.drawText("Building", RectLeft+60, RectTop+60, paint2);
paint.setStyle(Paint.Style.STROKE);
paint.setColor(color);
paint.setStrokeWidth(3);
canvas.drawRect(RectLeft, RectTop, RectRight, RectBottom, paint);
mHolder.unlockCanvasAndPost(canvas);
} catch (Exception e) {
e.printStackTrace();
}
}
public void createFIle(){
try {
DrawFocusRect(RectLeft, RectTop, RectRight, RectBottom, getResources().getColor(com.nep.R.color.white_color));
Bitmap b = Bitmap.createBitmap(mSurfaceView.getWidth(), mSurfaceView.getHeight(), Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(b);
mSurfaceView.draw(c);
// Bitmap bmp = getBitmapFromView(frame);
String mFile = mPath+"_layout011.png";
File directory = new File (mFile);
directory.createNewFile();
OutputStream fo = new FileOutputStream(directory);
ByteArrayOutputStream os = new ByteArrayOutputStream();
b.compress(CompressFormat.JPEG, 100, os);
os.writeTo(fo);
fo.close();
os.close();
// mSurfaceView.destroyDrawingCache();
BasicMethods.showToast("Saved at - "+mFile, mContext);
} catch (Exception e) {
e.printStackTrace();
}
}
}
i have user this code and it is not working,so i put my surface view inside other view and try to capture bitmap from that i was previously posted.i have try both way but not geting any solution.
Create a Bitmap, create a Canvas for the bitmap, execute all of your drawing commands on that Canvas, save the bitmap.
You can't capture the SurfaceView's surface, so re-drawing onto a Bitmap is the easiest way. This comes up fairly often; see e.g. this.
Im trying to draw canvas on the image and save it with changes. When app starts I can see my canvas drawing, but it saves without canvas drawing. Here is my code:
public class MyActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new DrawView(this));
}
class DrawView extends View {
Paint p;
Path path;
public DrawView(Context context) {
super(context);
p = new Paint();
p.setStrokeWidth(30);
p.setStyle(Paint.Style.STROKE);
path = new Path();
}
#Override
protected void onDraw(Canvas can) {
Bitmap bm = BitmapFactory.decodeFile("/sdcard/MANUAL/img1394916221.png");
can.drawBitmap(bm, 0, 0, p);
path.reset();
path.moveTo(250, 100);
path.lineTo(300, 200);
path.lineTo(200, 200);
path.close();
p.setColor(Color.RED);
can.drawPath(path, p);
FileOutputStream out;
try {
out = new FileOutputStream("/sdcard/MANUAL/img.png");
bm.compress(Bitmap.CompressFormat.PNG, 90, out);
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
Where is my mistake?
Check this sample . How to export a View as Bitmap
http://gmariotti.blogspot.it/2013/10/how-to-export-view-as-bitmap.html?m=1