Android SurfaceView画板操作
时间：2021-06-03 09:12:46|栏目：Android代码|点击： 次
本文实例为大家分享了Android SurfaceView画板操作的具体代码，供大家参考，具体内容如下
画板――画路径
package com.example.review.view;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PorterDuff;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
/**
* 画板画路径
*/
public class HuabanView extends SurfaceView implements SurfaceHolder.Callback {
private SurfaceHolder surfaceHolder;
private Path path = new Path();
public HuabanView(Context context) {
super(context);
}
public HuabanView(Context context, AttributeSet attrs) {
super(context, attrs);
surfaceHolder = getHolder();
surfaceHolder.addCallback(this);//获得surfaceview的生命周期
}
public HuabanView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
public HuabanView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
new HuabanThread().start();
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float x = event.getX();
float y = event.getY();
int action = event.getAction();
if (action == MotionEvent.ACTION_DOWN) {//按下
path.moveTo(x, y);
} else if (action == MotionEvent.ACTION_MOVE) {//移动
path.lineTo(x, y);
}
return true;
}
class HuabanThread extends Thread {
@Override
public void run() {
super.run();
//TODO:画笔
Paint paint = new Paint();
paint.setColor(Color.BLACK);
paint.setStrokeWidth(20);
paint.setStyle(Paint.Style.STROKE);
paint.setAntiAlias(true);
//TODO:画布
while (true) {
Canvas canvas = surfaceHolder.lockCanvas();
//避免空指针
if (canvas == null){
return;
}
canvas.drawColor(Color.WHITE, PorterDuff.Mode.CLEAR);
canvas.drawColor(Color.WHITE);
canvas.drawPath(path,paint);
surfaceHolder.unlockCanvasAndPost(canvas);
}
}
}
public void close(){
path.reset();
}
}
画板――画动态直线
package com.example.review.view;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PorterDuff;
import android.util.AttributeSet;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
/**
* 画板画路径
* 画动态直线
*/
public class LineView extends SurfaceView implements SurfaceHolder.Callback {
private SurfaceHolder surfaceHolder;
private Path path = new Path();
private int x = 0;
public LineView(Context context) {
super(context);
}
public LineView(Context context, AttributeSet attrs) {
super(context, attrs);
surfaceHolder = getHolder();
surfaceHolder.addCallback(this);//获得surfaceview的生命周期
}
public LineView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
public LineView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
new HuabanThread().start();
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
}
class HuabanThread extends Thread {
@Override
public void run() {
super.run();
//TODO:画笔
Paint paint = new Paint();
paint.setColor(Color.BLACK);
paint.setStrokeWidth(20);
paint.setStyle(Paint.Style.STROKE);
paint.setAntiAlias(true);
//TODO:画布
while (true) {
Canvas canvas = surfaceHolder.lockCanvas();
//避免空指针
if (canvas == null){
return;
}
canvas.drawColor(Color.WHITE, PorterDuff.Mode.CLEAR);
canvas.drawColor(Color.WHITE);
canvas.drawLine(0,100,x++,100,paint);
surfaceHolder.unlockCanvasAndPost(canvas);
}
}
}
public void close(){
path.reset();
}
}
基本图形
//圆
canvas.drawOval(50,100,150,200,paint);
//半圆
canvas.drawArc(500,500,700,700,20,180,true,paint);
//矩形
canvas.drawRect(100,300,250,400,paint);
//三角形
canvas.drawLine(100,450,0,600,paint);
canvas.drawLine(0,600,400,600,paint);
canvas.drawLine(100,450,400,600,paint);
//梯形
canvas.drawLine(100,700,200,700,paint);
canvas.drawLine(100,700,0,900,paint);
canvas.drawLine(0,900,400,900,paint);
canvas.drawLine(200,700,400,900,paint);
//文字
canvas.drawText("截图",100,1000,paint);
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