Android自定义view 画图——圆环进度条

一、实现效果图

二、核心代码

自定义view的属性

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <declare-styleable name="RingProgressBar">
        <attr name="ringColor" format="color" />
        <attr name="ringProgressColor" format="color" />
        <attr name="ringWidth" 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>

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自定义view

package com.czhappy.ringprogressdemo.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.graphics.Typeface;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;

import com.czhappy.ringprogressdemo.R;

public class RingProgressBar extends View {

    /**
     * 画笔对象的引用
     */
    private Paint ringPaint;
    private Paint ringProgressPaint;
    private Paint txtPaint;

    /**
     * 圆环的颜色
     */
    private int ringColor;

    /**
     * 圆环进度的颜色
     */
    private int ringProgressColor;

    /**
     * 中间进度百分比的字符串的颜色
     */
    private int textColor;

    /**
     * 中间进度百分比的字符串的字体
     */
    private float textSize;

    /**
     * 圆环的宽度
     */
    private float ringWidth;

    /**
     * 最大进度
     */
    private int max;

    /**
     * 当前进度
     */
    private int progress;
    /**
     * 是否显示中间的进度
     */
    private boolean textIsDisplayable;

    private Context mContext;
    /**
     * 进度的风格，实心或者空心
     */
    private int style;

    public static final int STROKE = 0;
    public static final int FILL = 1;

    public RingProgressBar(Context context) {
        this(context, null);
    }

    public RingProgressBar(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public RingProgressBar(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        this.mContext = context;
        // 获取自定义的属性
        initAttrs(context, attrs);
        initPaint();
    }

    private void initAttrs(Context context, AttributeSet attrs) {
        TypedArray mTypedArray = context.obtainStyledAttributes(attrs,
                R.styleable.RingProgressBar);

        //获取自定义属性和默认值
        ringColor = mTypedArray.getColor(R.styleable.RingProgressBar_ringColor, Color.GRAY);
        ringProgressColor = mTypedArray.getColor(R.styleable.RingProgressBar_ringProgressColor, Color.GREEN);
        textColor = mTypedArray.getColor(R.styleable.RingProgressBar_textColor, Color.GREEN);
        textSize = mTypedArray.getDimension(R.styleable.RingProgressBar_textSize, 16);
        ringWidth = mTypedArray.getDimension(R.styleable.RingProgressBar_ringWidth, 5);
        max = mTypedArray.getInteger(R.styleable.RingProgressBar_max, 100);
        textIsDisplayable = mTypedArray.getBoolean(R.styleable.RingProgressBar_textIsDisplayable, true);
        style = mTypedArray.getInt(R.styleable.RingProgressBar_style, 0);

        //资源回收
        mTypedArray.recycle();
    }

    /**
     * 初始化画笔
     */
    private void initPaint() {
        //圆环画笔
        ringPaint = new Paint();
        ringPaint.setColor(ringColor); //设置圆环的颜色
        ringPaint.setStyle(Paint.Style.STROKE); //设置空心
        ringPaint.setStrokeWidth(ringWidth); //设置圆环的宽度
        ringPaint.setAntiAlias(true);  //消除锯齿

        //圆环进度画笔
        ringProgressPaint = new Paint();
        ringProgressPaint.setColor(ringProgressColor); //设置圆环的颜色
        ringProgressPaint.setStrokeWidth(ringWidth); //设置圆环的宽度
        ringProgressPaint.setAntiAlias(true);  //消除锯齿
        switch (style) {
            case STROKE:
                ringProgressPaint.setStyle(Paint.Style.STROKE);
                break;
            case FILL:
                ringProgressPaint.setStyle(Paint.Style.FILL_AND_STROKE);
                break;
        }

        //百分比文字画笔
        txtPaint = new Paint();
        txtPaint.setColor(textColor);
        txtPaint.setTextSize(textSize);
        txtPaint.setTypeface(Typeface.DEFAULT_BOLD); //设置字体
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        //圆心坐标
        int mXCenter = getWidth() / 2;
        int mYCenter = getHeight() / 2;
        int radius = (int) (mXCenter - ringWidth / 2); //圆环的半径
        //绘制圆环
        canvas.drawCircle(mXCenter, mYCenter, radius, ringPaint);

        //绘制圆环进度
        RectF oval = new RectF(mXCenter - radius, mYCenter - radius, mXCenter
                + radius, mYCenter + radius);  //用于定义的圆弧的形状和大小的界限
        switch (style) {
            case STROKE:
                canvas.drawArc(oval, -90, 360 * progress / max, false, ringProgressPaint);  //根据进度画圆弧
                break;
            case FILL:
                if (progress != 0)
                    canvas.drawArc(oval, -90, 360 * progress / max, true, ringProgressPaint);  //根据进度画圆弧
                break;
        }

        //绘制百分比数字
        //文字绘制
        String txt = progress  + "%";
        //文字的长度
        float mTxtWidth = txtPaint.measureText(txt, 0, txt.length());
        Log.e("tag", textIsDisplayable+","+progress+(style==STROKE));
        if(textIsDisplayable && progress!=0 && style==STROKE){
            canvas.drawText(txt, mXCenter - mTxtWidth / 2, mYCenter+textSize/2, txtPaint);
        }


    }

    public synchronized int getMax() {
        return max;
    }

    /**
     * 设置进度的最大值
     * @param max
     */
    public synchronized void setMax(int max) {
        if(max < 0){
            throw new IllegalArgumentException("max not less than 0");
        }
        this.max = max;
    }

    /**
     * 获取进度.需要同步
     * @return
     */
    public synchronized int getProgress() {
        return progress;
    }

    /**
     * 设置进度，此为线程安全控件，由于考虑多线程的问题，需要同步
     * 刷新界面调用postInvalidate()能在非UI线程刷新
     * @param progress
     */
    public synchronized void setProgress(int progress) {
        if(progress < 0){
            throw new IllegalArgumentException("progress not less than 0");
        }
        if(progress > max){
            progress = max;
        }
        if(progress <= max){
            this.progress = progress;
            postInvalidate();
        }

    }

    public int getRingColor() {
        return ringColor;
    }

    public void setRingColor(int ringColor) {
        this.ringColor = ringColor;
    }

    public int getRingProgressColor() {
        return ringProgressColor;
    }

    public void setRingProgressColor(int ringProgressColor) {
        this.ringProgressColor = ringProgressColor;
    }

    public int getTextColor() {
        return textColor;
    }

    public void setTextColor(int textColor) {
        this.textColor = textColor;
    }

    public float getTextSize() {
        return textSize;
    }

    public void setTextSize(float textSize) {
        this.textSize = textSize;
    }

    public float getRingWidth() {
        return ringWidth;
    }

    public void setRingWidth(float roundWidth) {
        this.ringWidth = roundWidth;
    }
}

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MainActivity.java

package com.czhappy.ringprogressdemo.activity;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;

import com.czhappy.ringprogressdemo.R;
import com.czhappy.ringprogressdemo.view.RingProgressBar;

public class MainActivity extends AppCompatActivity {

    private RingProgressBar myProgress;

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

        myProgress = (RingProgressBar) findViewById(R.id.myProgress);

    }

    public void beginAnim(View view){
        new Thread(){

            @Override
            public void run() {
                super.run();
                for(int i=0; i<=60; i++){
                    try {
                        Thread.sleep(20);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    myProgress.setProgress(i);
                }
            }
        }.start();

    }
}

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布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:ring="http://schemas.android.com/apk/res-auto"
    android:id="@+id/activity_main"
    android:gravity="center_horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <Button
        android:layout_width="match_parent"
        android:onClick="beginAnim"
        android:layout_height="wrap_content"
        android:text="开始动画"/>

    <com.czhappy.ringprogressdemo.view.RingProgressBar
        android:id="@+id/myProgress"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_marginTop="20dp"
        ring:ringColor="@color/ring_color"
        ring:ringProgressColor="@color/ring_progress_color"
        ring:textColor="@color/ring_progress_color"
        ring:textIsDisplayable="true"
        ring:ringWidth="6dp"
        ring:textSize="16sp"/>
</LinearLayout>