自定义view

-----------------------vaules/attrs-------------------
<declare-styleable name="ProgressView"
        >
        <!--circleColor 设置圆形边框的颜色  sweepColor设置扇形变换的颜色
         startAngle 设置起始角度 sweepStep 设置变换的步长-->
                 <attr name="circleColor" format="color|reference"></attr>
                 <attr name="sweepColor" format="color|reference"></attr>
                 <attr name="startAngle" format="integer"></attr>
                 <attr name="sweepStep" format="integer"></attr>
                <attr name="padding" format="integer"></attr>
    </declare-styleable>
--------------------------------------------------------------

package com.exbawei.liteli.view;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.View;/** * Created by li te li on 2017/10/18. */public class ProgressView extends View {    int sweepStep=10;    int padding=40;    int circleColor= Color.GRAY;    int sweepColor=Color.BLUE;    int startAngle=90;    int storke=10;    int sweepAngle=0;    int DEFAULT_WIDTH=200;    int DEFAULT_HEIGHT = 200;    public ProgressView(Context context) {        super(context);    }    public ProgressView(Context context, AttributeSet attrs) {        super(context, attrs);        TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.ProgressView);        if (array != null) {                        //获取我们在xml中设置的各个自定义属性                         sweepStep = array.getInteger(R.styleable.ProgressView_sweepStep, sweepStep);                         padding = array.getInteger(R.styleable.ProgressView_padding, padding);                         circleColor = array.getColor(R.styleable.ProgressView_circleColor, circleColor);                         sweepColor = array.getColor(R.styleable.ProgressView_sweepColor, sweepColor);                         startAngle = array.getInteger(R.styleable.ProgressView_startAngle, startAngle);                         //回收TypeArray资源                         array.recycle();                     }            }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        Paint mPaint = new Paint();        mPaint.setAntiAlias(true);         mPaint.setColor(circleColor);        mPaint.setStrokeWidth(storke);        mPaint.setStyle(Paint.Style.STROKE);        canvas.drawCircle(getWidth()/2,getWidth()/2,getWidth()/2-storke/2,mPaint);        invalidate();//请求重新绘制view                //绘制内部的扇形               mPaint.setStyle(Paint.Style.FILL_AND_STROKE);                mPaint.setColor(sweepColor);        RectF rectF = new RectF(padding + storke, padding + storke, getWidth() - padding - storke, getWidth() - padding - storke);                 canvas.drawArc(rectF, startAngle, sweepAngle, true, mPaint);                sweepAngle += sweepStep;//根据步长更新扫过的角度                 sweepAngle = sweepAngle > 360 ? 0 : sweepAngle;                invalidate();//重绘view    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);               int wMode = MeasureSpec.getMode(widthMeasureSpec);               int hMode = MeasureSpec.getMode(heightMeasureSpec);                int wSize = MeasureSpec.getSize(widthMeasureSpec);                int hSize = MeasureSpec.getSize(heightMeasureSpec);        switch (wMode) {                        case MeasureSpec.AT_MOST://android:layout_width="warp_content"                                 //获取屏幕像素                               float density = getResources().getDisplayMetrics().density;                              wSize = (int) (DEFAULT_WIDTH * density);                                 hSize = (int) (DEFAULT_HEIGHT * density);                               break;                        //当在xml中指定控件的宽高为match_parent或者指定数值的宽高时，回调以下代码                        case MeasureSpec.EXACTLY://android:layout_width="match_parent" android:layout_width="40dp"                                wSize = hSize = Math.min(wSize, hSize);                                break;                     }                //只要重写onMeasure()方法，一定要调用以下方法，不然会报错                 setMeasuredDimension(wSize, hSize);             }    public ProgressView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }//    public ProgressView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {//        super(context, attrs, defStyleAttr, defStyleRes);//    }}
---------------------------------------------
<com.exbawei.liteli.view.ProgressView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/pv"
    app:circleColor="#aa0000"
   app:sweepColor="#00aa00"
   app:sweepStep="1"
    app:startAngle="180"
    />