扇形——单点触控

activity_main:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <com.ch.view.DrawView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="@string/hello_world" />

</RelativeLayout>

MainActivity.class:

package com.ch.onedot;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

}

com.ch.view.DrawView:

package com.ch.view;


import com.example.day4_two.R;

import android.annotation.SuppressLint;
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.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;

public class DrawView extends View{
     float currentX=70;
     float currentY=90;
    Paint paint=new Paint();
    Paint paint1=new Paint();
     /** 
     * 圆环的颜色 
     */  
    private int roundColor;  
      
    /** 
     * 圆环进度的颜色 
     */  
    private int roundProgressColor; 
    
    public DrawView(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
    }
    public DrawView(Context context, AttributeSet attrs) {
        super(context, attrs);
        // TODO Auto-generated constructor stub
        //自定义RoundProgressBar
        TypedArray mTypedArray = context.obtainStyledAttributes(attrs,  
                R.styleable.RoundProgressBar);  
          
        //获取自定义属性和默认值  
        roundColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundColor, Color.RED);  
        roundProgressColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundProgressColor, Color.GREEN);
        //重复利用
        mTypedArray.recycle();
    }
    public DrawView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        //自定义RoundProgressBar
        TypedArray mTypedArray = context.obtainStyledAttributes(attrs,  
                R.styleable.RoundProgressBar);  
          
        //获取自定义属性和默认值  
        roundColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundColor, Color.RED);  
        roundProgressColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundProgressColor, Color.GREEN);
        //重复利用
        mTypedArray.recycle();
    }

    @SuppressLint("DrawAllocation")
    @Override
    protected void onDraw(Canvas canvas) {
        // TODO Auto-generated method stub
        //设置空心
        paint.setStyle(Paint.Style.STROKE);
        //消除锯齿
        paint.setAntiAlias(true);
        paint.setStrokeWidth(10);
        /*
        paint.setColor(Color.RED);
        
        
        paint1.setColor(Color.BLUE);
        paint1.setTextSize(30);
        canvas.drawCircle(currentX, currentY, 50, paint);//小圆
        canvas.drawCircle(currentX, currentY, 70, paint);//大圆
        canvas.drawLine(currentX, currentY, currentX, currentY+70, paint);
        canvas.drawText("你好", currentX-32, currentY+18, paint1);*/
        
        paint.setColor(roundColor);
        canvas.drawCircle(currentX, currentY, 50, paint);
        
        RectF oval = new RectF(currentX - 75, currentY - 75, currentX + 75, currentY + 75);  //用于定义的圆弧的形状和大小的界限
        paint1.setStrokeWidth(10);
        //设置空心
        //paint1.setStyle(Paint.Style.STROKE);
        //消除锯齿
        paint1.setAntiAlias(true);
        paint1.setColor(roundProgressColor);
        canvas.drawArc(oval, 10,(float) (Math.random()* 360), true, paint1);
        //字体
         
        super.onDraw(canvas);
    }
    
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        // TODO Auto-generated method stub
        /*currentX=(float) (Math.random()*event.getX());
        currentY=(float) (Math.random()*event.getY());*/
        currentX=(float) (Math.random()*getWidth());
        currentY=(float) (Math.random()*getHeight());
        invalidate();
        return true;
        
    }
}

attrs.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <!--完成进度条-->

<declare-styleable name="RoundProgressBar" >

    <attr name="roundColor" format="color"/>

    <attr name="roundProgressColor" format="color"/>

    <attr name="roundWidth" format="dimension"></attr>

    <attr name="textColor" format="color" />

    <attr name="textSize" format="dimension" />

    <attr name="max" format="integer"></attr>

    <attr name="textIsDisplayable" format="boolean"></attr>

    <attr name="style">

        <enum name="STROKE" value="0"></enum>

        <enum name="FILL" value="1"></enum>

    </attr>

</declare-styleable>
    
</resources>