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
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
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
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
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
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
|
//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服务器之家。
原文链接：https://blog.csdn.net/weixin_45697390/article/details/105804970
