Hi,
I'm trying to draw some primitives on SurfaceView Canvas, but I can't do this. I need to implement a VideoPlayer(SurfaceView) with ability to draw on it(and save user's drawing in future). Can I do this anyhow? Is it possible on Android?
There is my code (only drawing on player):
Any ideas or help here?
Thanks.
I'm trying to draw some primitives on SurfaceView Canvas, but I can't do this. I need to implement a VideoPlayer(SurfaceView) with ability to draw on it(and save user's drawing in future). Can I do this anyhow? Is it possible on Android?
There is my code (only drawing on player):
Code:
package com.example.canvasdrawing;
import java.io.IOException;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.util.Log;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.widget.Button;
import android.widget.VideoView;
public class CanvasDrawing extends Activity {
private ArrayList<Path> _graphics = new ArrayList<Path>();
private Paint mPaint;
MediaPlayer mp = new MediaPlayer();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.main);
setContentView(new DrawingPanel(this));
Log.d("mytag", "1");
mPaint = new Paint();
mPaint.setDither(true);
mPaint.setAntiAlias(true);
mPaint.setColor(0xFFFFFF00);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeJoin(Paint.Join.ROUND);
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setStrokeWidth(3);
Log.d("mytag", "2");
}
class DrawingPanel extends SurfaceView implements SurfaceHolder.Callback {
private DrawingThread _thread;
private Path path;
public DrawingPanel(Context context) {
super(context);
getHolder().addCallback(this);
//
getHolder().setType(SurfaceHolder.SURFACE_TYPE_NORMAL);
//getHolder().setFixedSize(100, 100);
//
Log.d("mytag", "3");
_thread = new DrawingThread(getHolder(), this);
Log.d("mytag", "4");
}
public boolean onTouchEvent(MotionEvent event) {
synchronized (_thread.getSurfaceHolder()) {
if(event.getAction() == MotionEvent.ACTION_DOWN){
path = new Path();
path.moveTo(event.getX(), event.getY());
path.lineTo(event.getX(), event.getY());
}else if(event.getAction() == MotionEvent.ACTION_MOVE){
path.lineTo(event.getX(), event.getY());
}else if(event.getAction() == MotionEvent.ACTION_UP){
path.lineTo(event.getX(), event.getY());
_graphics.add(path);
}
return true;
}
}
@Override
public void onDraw(Canvas canvas) {
for (Path path : _graphics) {
//canvas.drawPoint(graphic.x, graphic.y, mPaint);
canvas.drawPath(path, mPaint);
}
}
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
}
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
mp = new MediaPlayer();
mp.setDisplay(holder);
try {
mp.setDataSource("/data/test.3gp");
mp.prepare();
mp.start();
Log.d("mytag", "5");
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//
_thread.setRunning(true);
_thread.start();
Log.d("mytag", "6");
}
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
mp.release();
boolean retry = true;
_thread.setRunning(false);
while (retry) {
try {
_thread.join();
retry = false;
} catch (InterruptedException e) {
// we will try it again and again...
}
}
}
}
class DrawingThread extends Thread {
private SurfaceHolder _surfaceHolder;
private DrawingPanel _panel;
private boolean _run = false;
public DrawingThread(SurfaceHolder surfaceHolder, DrawingPanel panel) {
_surfaceHolder = surfaceHolder;
_panel = panel;
}
public void setRunning(boolean run) {
_run = run;
}
public SurfaceHolder getSurfaceHolder() {
return _surfaceHolder;
}
@Override
public void run() {
Canvas c;
while (_run) {
c = null;
try {
c = _surfaceHolder.lockCanvas(null);
synchronized (_surfaceHolder) {
_panel.onDraw(c);
}
} finally {
// do this in a finally so that if an exception is thrown
// during the above, we don't leave the Surface in an
// inconsistent state
if (c != null) {
_surfaceHolder.unlockCanvasAndPost(c);
}
}
}
}
}
}
Any ideas or help here?
Thanks.