Android canvas implementation and demo, android canvas demo

Android canvas implementation and demo, android canvas demo

Today we bring you a simple implementation of the Android canvas function. The following is:

The following are the key source code:

import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Paint.Style;import android.graphics.PaintFlagsDrawFilter;import android.graphics.Path;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import android.view.View.OnTouchListener;import android.view.SurfaceHolder;import android.view.SurfaceHolder.Callback;import android.view.SurfaceView;public class MyView extends SurfaceView implements Callback,OnTouchListener{private Paint p = new Paint();private Path path = new Path();public MyView(Context context, AttributeSet attrs) {super(context, attrs);getHolder().addCallback(this);p.setColor(Color.RED);p.setTextSize(10);p.setAntiAlias(true);p.setStyle(Style.STROKE);setOnTouchListener(this);}public void draw(){Canvas canvas = getHolder().lockCanvas();canvas.drawColor(Color.WHITE);canvas.drawPath(path, p);getHolder().unlockCanvasAndPost(canvas);}public void clear(){path.reset();draw();}@Overridepublic void surfaceCreated(SurfaceHolder holder) {draw();}@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {// TODO Auto-generated method stub}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {// TODO Auto-generated method stub}@Overridepublic boolean onTouch(View v, MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:path.moveTo(event.getX(), event.getY());draw();break;case MotionEvent.ACTION_MOVE:path.lineTo(event.getX(), event.getY());draw();break;}return true;}}

Demo Apk and its source code download: http://pan.baidu.com/s/1i33QO9R

You are welcome to pay attention to the Public Account of the Android developer community. The official website will occasionally bring you some demos or frameworks for android development with high quality trials to improve your development efficiency, we provide you with a high quality android demo source code.

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