效果展示
这个一看是属于 交互型自定义控件，所以得按下面这个套路来：
- 先画出没有交互时的默认状态
- 处理onTouchEvent()的 DOWN 事件，绘制按下时的状态
- 处理onTouchEvent()的 MOVE 事件， 绘制手指移动时的状态
- 圆画完了之后就是处理画线和画箭头问题了
- 最后一点就是手指在移动的过程中与最后一个点的连线
一、自定义控件java类
package com.wust.nineview;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import androidx.annotation.Nullable;
import java.util.ArrayList;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;
/**
* ClassName: selfNineView <br/>
* Description: <br/>
* date: 2021/5/26 9:34<br/>
*
* @author yiqi<br />
* @email：1820762465@qq.com
* @QQ：1820762465
* @since JDK 1.8
*/
public class selfNineView extends View {
private boolean initFlag = false;
private List<myPoint> mPointData;
private List<myPoint> mSelectData;
private float downPointX;
private float downPointY;
private float outCircleR;
private float inCircleR;
private Paint normalPaint;
private int normalColor = Color.parseColor("#505450");
private Paint downPaint;
private int downColor = Color.parseColor("#00ff00");
private Paint errorPaint;
private int errorColor = Color.parseColor("#ff0000");
private Paint linePressPaint;
private float arrowHeight = 20;
private int angle = 30;
private onTouchResult mOnTouchResult;
private boolean isWrongFlag = false;
private boolean isPressFlag = false;
public selfNineView(Context context) {
this(context, null);
}
public selfNineView(Context context, @Nullable AttributeSet attrs) {
this(context, attrs, 0);
}
public selfNineView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
mSelectData = new ArrayList<>();
normalPaint = initPaint(normalColor);
downPaint = initPaint(downColor);
errorPaint = initPaint(errorColor);
linePressPaint = initPaint(downColor);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
@Override
protected void onDraw(Canvas canvas) {
if (!initFlag) {
initCell();
initFlag = true;
}
drawCircle(canvas);
drawLine(canvas);
}
//绘制两个点之间的连线以及箭头
private void drawLine(Canvas canvas) {
if (mSelectData != null && mSelectData.size() != 0) {
// System.out.println(mSelectData.size());
myPoint lastPoint = mSelectData.get(0);
if (isWrongFlag){
linePressPaint.setColor(errorColor);
}else {
linePressPaint.setColor(downColor);
}
for (int i = 1; i < mSelectData.size(); i++) {
myPoint curPoint = mSelectData.get(i);
float d = (float) twoPointDistace(lastPoint.x, lastPoint.y, curPoint.x, curPoint.y);
float cos_a = (curPoint.x - lastPoint.x) * 1.0f / d;
float sin_a = (curPoint.y - lastPoint.y) * 1.0f / d;
canvas.drawLine(lastPoint.x + inCircleR * cos_a, lastPoint.y + inCircleR * sin_a,
curPoint.x - inCircleR * cos_a, curPoint.y - inCircleR * sin_a, linePressPaint);
//绘制箭头
drawArrow(lastPoint.x, lastPoint.y, d, cos_a, sin_a, canvas);
lastPoint = curPoint;
}
if (isPressFlag){
//绘制射线
float d = (float) twoPointDistace(lastPoint.x, lastPoint.y, downPointX, downPointY);
float cos_a = (downPointX - lastPoint.x) * 1.0f / d;
float sin_a = (downPointY - lastPoint.y) * 1.0f / d;
canvas.drawLine(lastPoint.x + inCircleR * cos_a, lastPoint.y + inCircleR * sin_a,
downPointX, downPointY, linePressPaint);
}
}
}
private void drawArrow(float startX, float startY, float d, float cos_a, float sin_a, Canvas canvas) {
float l = (float) (arrowHeight * (Math.tan(Math.toRadians(angle))));
float x0 = startX + (d - outCircleR - arrowHeight) * cos_a;
float y0 = startY + (d - outCircleR - arrowHeight) * sin_a;
float x1 = startX + (d - outCircleR) * cos_a;
float y1 = startY + (d - outCircleR) * sin_a;
float x2 = x0 + l * sin_a;
float y2 = y0 - l * cos_a;
float x3 = x0 - l * sin_a;
float y3 = y0 + l * cos_a;
Path path = new Path();
path.moveTo(x1, y1);
path.lineTo(x2, y2);
path.lineTo(x3, y3);
path.close();
linePressPaint.setStyle(Paint.Style.FILL);
canvas.drawPath(path, linePressPaint);
}
private double twoPointDistace(float startX, float startY, float endX, float endY) {
return Math.sqrt(Math.pow(startX - endX, 2) + Math.pow(startY - endY, 2));
}
@Override
public boolean onTouchEvent(MotionEvent event) {
downPointX = event.getX();
downPointY = event.getY();
System.out.println(event.getAction());
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
isPressFlag = true;
for (int i = 0; i < mPointData.size(); i++) {
myPoint currentPoint = mPointData.get(i);
if (checkIsInCircle(downPointX, downPointY, currentPoint.x, currentPoint.y, outCircleR)) {
//记录按下的那个点，等下要以密码的形式返回出去
mSelectData.add(currentPoint);
currentPoint.state = myPoint.STATE_DOWN;
}
}
invalidate();
break;
case MotionEvent.ACTION_MOVE:
for (int i = 0; i < mPointData.size(); i++) {
myPoint currentPoint = mPointData.get(i);
if (checkIsInCircle(downPointX, downPointY, currentPoint.x, currentPoint.y, outCircleR)) {
//防止反复记下重复点
if (!mSelectData.contains(currentPoint)) {
mSelectData.add(currentPoint);
currentPoint.state = myPoint.STATE_DOWN;
}
}
}
invalidate();
break;
case MotionEvent.ACTION_UP:
isPressFlag = false;
if (mSelectData != null && mSelectData.size() != 0) {
//抬起的时候，密码回调
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < mSelectData.size(); i++) {
stringBuilder.append(mSelectData.get(i).i);
}
// System.out.println("stringBuilder.toString() ->" + stringBuilder.toString());
mOnTouchResult.result(stringBuilder.toString());
}
//清除状态
postDelayed(new Runnable() {
@Override
public void run() {
clearState();
invalidate();
}
},1000);
break;
}
return true;
}
private void clearState() {
isWrongFlag = false;
mSelectData.clear();
for (int i = 0; i < mPointData.size(); i++) {
mPointData.get(i).state = myPoint.STATE_NORMAL;
}
}
//检查是否在圈内
private boolean checkIsInCircle(float downPointX, float downPointY, float centerX, float centerY, float R) {
return Math.sqrt(Math.pow(downPointX - centerX, 2) + Math.pow(downPointY - centerY, 2)) < R;
}
//初始化画笔
private Paint initPaint(int color) {
Paint paint = new Paint();
paint.setDither(true);
paint.setAntiAlias(true);
paint.setStyle(Paint.Style.STROKE);
paint.setColor(color);
paint.setStrokeWidth(5);
return paint;
}
//画圈
private void drawCircle(Canvas canvas) {
System.out.println("drawCircle mSelectData ->" + mSelectData);
System.out.println("drawCircle mPointData ->" + mPointData);
for (int i = 0; i < mPointData.size(); i++) {
if (mPointData.get(i).state == myPoint.STATE_NORMAL) {
canvas.drawCircle(mPointData.get(i).x, mPointData.get(i).y, outCircleR, normalPaint);
canvas.drawCircle(mPointData.get(i).x, mPointData.get(i).y, inCircleR, normalPaint);
} else if (mPointData.get(i).state == myPoint.STATE_DOWN) {
canvas.drawCircle(mPointData.get(i).x, mPointData.get(i).y, outCircleR, downPaint);
canvas.drawCircle(mPointData.get(i).x, mPointData.get(i).y, inCircleR, downPaint);
}else if (mPointData.get(i).state == myPoint.STATE_ERROR) {
canvas.drawCircle(mPointData.get(i).x, mPointData.get(i).y, outCircleR, errorPaint);
canvas.drawCircle(mPointData.get(i).x, mPointData.get(i).y, inCircleR, errorPaint);
}
}
}
//初始化九个单元格
private void initCell() {
mPointData = new ArrayList<>();
//获取布局宽高
int width = getWidth();
int height = getHeight();
//第一个点的位置
float possionX = 0;
float possionY = 0;
//横竖屏兼容,计算第一个点的坐标
if (width < height) {
possionX = width * 1.0f / 6;
possionY = (height - width) * 1.0f / 2 + width * 1.0f / 6;
height = width;
} else {
possionX = (width - height) * 1.0f / 2 + height * 1.0f / 6;
possionY = height * 1.0f / 6;
width = height;
}
//设置内外圆的半径
outCircleR = width * 1.0f / 12;
inCircleR = width * 1.0f / 50;
//循环产生九个点
int n = 1;
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
mPointData.add(new myPoint(possionX + j * width * 1.0f / 3, possionY + i * height * 1.0f / 3, n++));
}
}
}
public void setOnTouchResultListener(onTouchResult onTouchResult) {
this.mOnTouchResult = onTouchResult;
}
public interface onTouchResult {
void result(String s);
}
public void pwdError() {
isWrongFlag = true;
for (int i = 0; i < mSelectData.size(); i++) {
mSelectData.get(i).state = myPoint.STATE_ERROR;
}
System.out.println("mSelectData ->" + mSelectData);
invalidate();
}
}
//创建一个点类 里面主要存储 点的位置和序号 这里为了减少代码量 我就不用 get 和 set 方法了
class myPoint {
public float x;
public float y;
public int i;
public static final int STATE_NORMAL = 0;
public static final int STATE_DOWN = 1;
public static final int STATE_ERROR = 2;
public int state = STATE_NORMAL;
public myPoint(float x, float y, int i) {
this.x = x;
this.y = y;
this.i = i;
}
@Override
public String toString() {
return "myPoint{" +
"x=" + x +
", y=" + y +
", i=" + i +
", state=" + state +
'}';
}
}
二、编写xml文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<com.wust.nineview.selfNineView
android:id="@+id/snv_selfnineview"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>三、调用
package com.wust.nineview;
import androidx.appcompat.app.AppCompatActivity;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
private selfNineView snv_selfnineview;
private final static String CORRECT_PWD = "13579";
private Toast mToast;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
snv_selfnineview = findViewById(R.id.snv_selfnineview);
snv_selfnineview.setOnTouchResultListener(new selfNineView.onTouchResult() {
@Override
public void result(String s) {
if (CORRECT_PWD.equals(s)){
showToast("密码输入正确");
}else {
showToast("密码输入错误，请重试");
snv_selfnineview.pwdError();
}
}
});
}
private void showToast(String text) {
runOnUiThread(new Runnable() {
@Override
public void run() {
if (mToast == null){
mToast = Toast.makeText(MainActivity.this,null,Toast.LENGTH_SHORT);
}
mToast.setText(text);
mToast.show();
}
});
}
}在这个自定义View里我觉得我印象最深的是这么两点。
1、箭头怎么画，那个画箭头的函数怎么写出来的？
解：大家可以结合这张图对照着我写的函数进行分析。
2、引用对象的赋值是引用的拷贝，即地址的拷贝，改变任意一个引用对象的值，都是在改变原型值。
解：下面这个函数改变的是 mSelectData 列表中 myPoint 引用对象的值，你会发现，我们绘制的时候是用 mPointData 列表中的 myPoint 引用对象画的，说明这两个引用变量指向的是同一块内存地址，任意一方对该地址内容进行修改，都会导致其内容变化。参考文章 java中调用方法传值问题详解
public void pwdError() {
isWrongFlag = true;
for (int i = 0; i < mSelectData.size(); i++) {
mSelectData.get(i).state = myPoint.STATE_ERROR;
}
System.out.println("mSelectData ->" + mSelectData);
invalidate();
}纸上得来终觉浅，绝知此事要躬行。最后，还是希望大家根据本人的思路自己实现一遍，自己动手做出来，才是属于自己的。
