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Android SurfaceView画板操作

2020年06月14日  | 移动技术网IT编程  | 我要评论

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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);

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持移动技术网。

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