Android自定义view制作抽奖转盘

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

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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