Image on canvas to JPEG file
- create an empty bitmap
- create a new Canvas object and pass this bitmap to it
- call view.draw(Canvas) passing it the canvas object you just created. Refer Documentation of method for details.
- Use Bitmap.compress() to write the contents of the bitmap to an OutputStream, file maybe.
Pseudo code:
Bitmap bitmap = Bitmap.createBitmap( view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888);Canvas canvas = new Canvas(bitmap);view.draw(canvas); bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
- set Drawing Cache Enabled
- Draw whatever you want
- Get Bitmap object from view
- Compress and save the image file
import java.io.File;import java.io.FileOutputStream;import android.app.Activity;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.os.Bundle;import android.util.Log;import android.view.View;public class CanvasTest extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Draw2d d = new Draw2d(this); setContentView(d); } public class Draw2d extends View { public Draw2d(Context context) { super(context); setDrawingCacheEnabled(true); } @Override protected void onDraw(Canvas c) { Paint paint = new Paint(); paint.setColor(Color.RED); c.drawCircle(50, 50, 30, paint); try { getDrawingCache().compress(Bitmap.CompressFormat.JPEG, 100, new FileOutputStream(new File("/mnt/sdcard/arun.jpg"))); } catch (Exception e) { Log.e("Error--------->", e.toString()); } super.onDraw(c); } }}
Canvas to JPG:
Canvas canvas = null;FileOutputStream fos = null;Bitmap bmpBase = null;bmpBase = Bitmap.createBitmap(image_width, image_height, Bitmap.Config.ARGB_8888);canvas = new Canvas(bmpBase);// draw what ever you want canvas.draw...// Save Bitmap to Filetry{ fos = new FileOutputStream(your_path); bmpBase.compress(Bitmap.CompressFormat.PNG, 100, fos); fos.flush(); fos.close(); fos = null;}catch (IOException e){ e.printStackTrace();}finally{ if (fos != null) { try { fos.close(); fos = null; } catch (IOException e) { e.printStackTrace(); } }}