Android 自定义圆形进度条

今天小编来手写一个自定义圆形进度条：先看效果：

首先我们在attrs属性文件中增加几个自定义属性

<?xml version="1.0" encoding="utf-8"?><resources>    <declare-styleable name="CustomProgressBar">        <!-- 圆形进度条进度显示的颜色 -->        <attr name="roundProgressColor" format="color"></attr>        <!-- 外圈圆的颜色 -->        <attr name="roundColor" format="color"></attr>        <!-- 圆的总宽度 -->        <attr name="roundWidth" format="dimension"></attr>        <!-- 字体显示的大小 -->        <attr name="textSize" format="dimension"></attr>        <!-- 字体显示的颜色　-->        <attr name="textColor" format="color"></attr>        <!-- 进度的最大值 -->        <attr name="max" format="integer"></attr>        <!-- 是否显示文字 -->        <attr name="textShow" format="boolean"></attr>    </declare-styleable></resources>

上我们自定义类的实现代码：

package xxx.xxx.xxx;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.support.annotation.Nullable;import android.util.AttributeSet;import android.view.View;import test.dn.com.dn_test.R;/** * Created by Administrator on 2017/5/16 0016. */public class CircleProgressBar extends View {    private int max;    //最大值    private int roundColor; //圆形进度条的颜色    private int roundProgressColor;//圆形进度条进度的颜色    private int textColor;      //字体的颜色    private float textSize;     //字体的大小    private float roundWidth;   //圆的宽度    private boolean textShow;   //是否显示圆    private int progress;   //当前进度    private Paint mPaint;   //画笔    public static final int STROKE = 0;    public static final int FILL = 1;    public CircleProgressBar(Context context, @Nullable AttributeSet attrs) {        super(context, attrs);        //初始化一只笔        mPaint = new Paint();        //获取xml当中设置的属性，如果没有设置，则设置一个默认值        TypedArray typedArray = context.obtainStyledAttributes(attrs , R.styleable.CustomProgressBar);        max = typedArray.getInteger(R.styleable.CustomProgressBar_max , 100);        roundColor = typedArray.getColor(R.styleable.CustomProgressBar_roundColor, Color.RED);        roundProgressColor = typedArray.getColor(R.styleable.CustomProgressBar_roundProgressColor , Color.BLUE);        textColor = typedArray.getColor(R.styleable.CustomProgressBar_textColor , Color.GREEN);        textSize = typedArray.getDimension(R.styleable.CustomProgressBar_textSize , 55);        roundWidth = typedArray.getDimension(R.styleable.CustomProgressBar_roundWidth , 10);        textShow = typedArray.getBoolean(R.styleable.CustomProgressBar_textShow , true);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        //画背景圆环        int center = getWidth() / 2;        //设置半径        float radius = center - roundWidth / 2;        //设置圆圈的颜色        mPaint.setColor(roundColor);        mPaint.setStyle(Paint.Style.STROKE);        mPaint.setStrokeWidth(roundWidth);//圆环的宽度        mPaint.setAntiAlias(true);//设置抗锯齿        //画外圈        canvas.drawCircle(center , center ,radius , mPaint);        //画进度百分比        mPaint.setColor(textColor);        mPaint.setStrokeWidth(0);        //设置字体大小        mPaint.setTextSize(textSize);        mPaint.setTypeface(Typeface.DEFAULT);        //设置笔帽        mPaint.setStrokeCap(Paint.Cap.ROUND);        //设置文字的摆放方式为居中        mPaint.setTextAlign(Paint.Align.CENTER);        //获取当前进度的值        int percent = (int) (progress / (float)max * 100);        String strPercent = percent + "%";        //获取画笔的文字属性，总共有bottom , top , leading , ascent , descent 这个以后会详细讲解        Paint.FontMetricsInt fm = mPaint.getFontMetricsInt();        if(percent != 0){            canvas.drawText(strPercent , getWidth() / 2 ,                    getWidth() / 2 + (fm.bottom - fm.top) / 2 - fm.bottom, mPaint);        }        //画圆弧        RectF oval = new RectF(center - radius , center - radius ,center + radius , center + radius);        mPaint.setColor(roundProgressColor);        mPaint.setStrokeWidth(roundWidth);        mPaint.setStyle(Paint.Style.STROKE);        //设置笔帽        mPaint.setStrokeCap(Paint.Cap.ROUND);        //话进度        canvas.drawArc(oval , 0 , 360 * progress / max , false , mPaint);    }    public void setProgress(int progress){        if(progress < 0){            throw  new IllegalArgumentException("进度progress不能小于0");        }        if(progress > max){            progress = max;        }        if(progress <= max){            this.progress = progress;            postInvalidate();        }    }}

在我们的xml中设置控件：

 <xxx.xxx.CircleProgressBar        android:id="@+id/progressbar"        android:layout_width="100dp"        android:layout_height="100dp"        app:roundProgressColor="#ff00ff"        app:textColor="#666666"        app:textSize="20dp"        app:roundWidth="15dp"        />

Activity功能实现代码：

mProgressBar = (CircleProgressBar) findViewById(R.id.progressbar);        mProgressBar.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //模拟http请求                new Thread(new Runnable() {                    @Override                    public void run() {                        while (progress <= 100){                            progress += 2;                            mProgressBar.setProgress(progress);                            //模拟网络请求，每隔100毫秒增加一个进度                            SystemClock.sleep(100);                        }                    }                }).start();            }        });

完结！