本文实例为大家分享了Android自定义view制作抽奖转盘的具体代码，供大家参考，具体内容如下

效果图

TurntableActivity

package com.bawei.myapplication.turntable;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.MotionEvent;

import android.view.View;

import android.view.animation.RotateAnimation;

import com.bawei.myapplication.R;

import com.bawei.myapplication.turntable.CustomTurntableView;

/**

* 转盘

* @author hasee

*/

public class TurntableActivity extends AppCompatActivity {

CustomTurntableView customTurntableView;

boolean isTouchInSide = false;

float mDownX, mDownY;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_turntable);

initView();

}

private void initView() {

customTurntableView = findViewById(R.id.custom);

// findViewById(R.id.custom_inside).setOnClickListener(new View.OnClickListener() {

// @Override

// public void onClick(View v) {

// float degrees = (float)(720 + Math.random() * 1000);

// RotateAnimation rotateAnimation = new RotateAnimation(0, -degrees, 450, 450);

// rotateAnimation.setDuration(5000);

// rotateAnimation.setFillAfter(true);

// customCircleView.startAnimation(rotateAnimation);

// }

// });

findViewById(R.id.custom_inside).setOnTouchListener(new View.OnTouchListener() {

@Override

public boolean onTouch(View v, MotionEvent event) {

if (event.getAction() == MotionEvent.ACTION_DOWN &&

event.getX() > 200 &&

event.getX() < 300 &&

event.getY() > 200 &&

event.getY() < 300) {

isTouchInSide = true;

mDownX = event.getX();

mDownY = event.getY();

return true;

}else if(event.getAction() == MotionEvent.ACTION_MOVE && (

event.getX() < mDownX -10 ||

event.getX() > mDownX + 10 ||

event.getY() < mDownY -10 ||

event.getY() > mDownY + 10) ){

isTouchInSide = false;

} else if (event.getAction() == MotionEvent.ACTION_UP &&

event.getX() > mDownX -10 &&

event.getX() < mDownX + 10 &&

event.getY() > mDownY -10 &&

event.getY() < mDownY + 10 &&

isTouchInSide) {

float degrees = (float) (720 + Math.random() * 1000);

RotateAnimation rotateAnimation = new RotateAnimation(0, -degrees, 250, 250);

rotateAnimation.setDuration(5000);

rotateAnimation.setFillAfter(true);

customTurntableView.startAnimation(rotateAnimation);

}

isTouchInSide = false;

return false;

}

});

}

}

对应的布局

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:id="@+id/ll"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

tools:context=".MainActivity">

android:id="@+id/custom"

android:layout_width="wrap_content"

android:layout_height="500dp"

/>

android:id="@+id/custom_inside"

android:layout_width="wrap_content"

android:layout_height="500dp"

app:text="开始"

android:background="#3300ff00" />

自定义CustomTurntableView继承view

package com.bawei.myapplication.turntable;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.Path;

import android.graphics.RectF;

import android.support.annotation.Nullable;

import android.util.AttributeSet;

import android.view.View;

/**

* 这里是画转盘的

* @author hasee

*/

public class CustomTurntableView extends View{

Paint mPaint;

int mCircleCount = 6;

float mStartAngle = 0;

RectF rectF;

public CustomTurntableView(Context context) {

super(context);

init();

}

public CustomTurntableView(Context context, @Nullable AttributeSet attrs) {

super(context, attrs);

init();

}

private void init(){

mPaint = new Paint();

mPaint.setColor(Color.BLUE);

mPaint.setStrokeWidth(10);

mPaint.setTextSize(60);

mPaint.setStyle(Paint.Style.FILL);

rectF = new RectF();

rectF.top = 100;

rectF.left = 100;

rectF.right = 400;

rectF.bottom = 400;

}

String[] textColor = {"一 等 奖","二 等 奖","三 等 奖","四 等 奖","五 等 奖","六 等 奖"};

@Override

protected void onDraw(Canvas canvas) {

super.onDraw(canvas);

for(int i = 0; i < mCircleCount; i++){

//按角标单双号设置扇形颜色，

if(i % 2 == 0 ){

mPaint.setColor(Color.BLUE);

}else{

mPaint.setColor(Color.GREEN);

}

canvas.drawArc(rectF, mStartAngle, 60, true, mPaint);

//设置转盘上的文字

mPaint.setColor(Color.BLACK);

mPaint.setTextSize(20);

Path path = new Path();

path.addArc(rectF,mStartAngle+20,60);

canvas.drawTextOnPath(textColor[i],path,-10,40,mPaint);

mStartAngle += 60;

}

}

}

自定义CustomTurntableInsideView继承view

package com.bawei.myapplication.turntable;

import android.content.Context;

import android.content.res.TypedArray;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.RectF;

import android.support.annotation.Nullable;

import android.util.AttributeSet;

import android.view.View;

import com.bawei.myapplication.R;

/**

* 转盘中间开始按钮和指针

* @author hasee

*/

public class CustomTurntableInsideView extends View {

/**

* 画笔

*/

Paint mPaint;

RectF mRectF;

String mStr;

public CustomTurntableInsideView(Context context) {

super(context);

init();

}

public CustomTurntableInsideView(Context context, @Nullable AttributeSet attrs) {

super(context, attrs);

//自定义属性，如何添加自定义属性如下(考点)

//第一步：在values文件夹下创建attrs.xml

//第二步：详见attrs.xml文件内部

//第三步：在所在的布局文件的根layout中添加xmlns:app="http://schemas.android.com/apk/res-auto"

//第四步：在布局文件的控件中添加app:"你在attrs中设置的attr name"="你的值"

//第五步：调用下面这句话，最后的为R.styleable.你在attrs中设置的declare-styleable name

TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.CustomTurntableView);

//第六步：调用下面这句话，根据你在attrs中设置的format，选择getXXX方法，

//入参为 R.styleable. 加上 你在attrs中设置的declare-styleable name 加上 _ 加上 你在attrs中设置的attr name

mStr = typedArray.getString(R.styleable.CustomTurntableView_text);

init();

}

private void init() {

//以下注释请看CustomBingView里面

mPaint = new Paint();

mPaint.setColor(Color.RED);

mPaint.setStrokeWidth(10);

mPaint.setTextSize(20);

mPaint.setStyle(Paint.Style.FILL);

mRectF = new RectF();

mRectF.top = 50;

mRectF.bottom = 300;

mRectF.right = 300;

mRectF.left = 200;

}

@Override

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

super.onMeasure(widthMeasureSpec, heightMeasureSpec);

// setMeasuredDimension(300, 300);

}

@Override

protected void onDraw(Canvas canvas) {

super.onDraw(canvas);

//设置画笔颜色为黑色，

mPaint.setColor(Color.BLACK);

//画出指针，用一个扇形，然后盖住后面补分来简单表示

canvas.drawArc(mRectF, 60, 60, true, mPaint);

mPaint.setColor(Color.RED);

//画一个红色的圆形，就是中间的大按钮

canvas.drawCircle(250, 250, 50, mPaint);

mPaint.setColor(Color.BLACK);

//添加按钮上的文字

canvas.drawText(mStr, 230, 260, mPaint);

//画三角，第一步，创建路径

// Path path = new Path();

//第二步，moveTo第一个顶点

// path.moveTo(300, 300);

//后续相继lineTo其他顶点

// path.lineTo(300, 400);

// path.lineTo(400, 400);

//闭合

// path.close();

// 画

// canvas.drawPath(path, mPaint);

}

}

自定义属性attrs.xml

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