Android View实现圆形进度条

本文实例为大家分享了android view实现圆形进度条的具体代码，供大家参考，具体内容如下

主要涉及到下面几个方法：

// 画圆
canvas.drawcircle
// 画圆弧
canvas.drawarc
// 画文本
canvas.drawtext
// 抗锯齿
paint.setantialias(true);
// 设置颜色
paint.setcolor(getresources().getcolor(mfgcolor, null));

其次就是对坐标的计算，还有注意就是画圆弧的时候，起始从-90度开始才是垂直上方。
效果图：

自定义view：

public class myview extends view {
    // 线宽度
    private static final int mstrokewidth = 50;
    private int mval = 0;
    private static final int mmaxval = 200;
    private int mggcolor = r.color.arcbg;
    private int mfgcolor = r.color.arcfg;

    public myview(context context) {
        super(context);
    }

    public myview(context context, @nullable attributeset attrs) {
        super(context, attrs);
    }


    // 设置值
    public void setprogressvalue(int val){
        this.mval = val;
        invalidate();
    }


    @override
    protected void ondraw(canvas canvas) {
        super.ondraw(canvas);
        int width = getmeasuredwidth();
        int height = getmeasuredheight();

        drawbgcircle(canvas, width, height);
        drawfgarc(canvas, width, height);
        drawtext(canvas, width, height);
    }

    // 文本
    private void drawtext(canvas canvas, int width, int height) {
        paint paint = new paint();
        paint.setantialias(true);
        paint.setcolor(getresources().getcolor(mfgcolor, null));
        paint.settextsize(120);
        int percent = (int) (( mval / (float) mmaxval ) * 100);
        canvas.drawtext(percent + "%", (width - paint.measuretext(percent + "%")) / 2, (height + paint.measuretext("%")) / 2, paint);
    }

    // 圆弧
    private void drawfgarc(canvas canvas, int width, int height) {
        paint paint = new paint();
        paint.setcolor(getresources().getcolor(mfgcolor, null));
        paint.setstyle(paint.style.stroke);
        paint.setstrokewidth(mstrokewidth);
        paint.setantialias(true);
        rectf mrectf = new rectf(mstrokewidth, mstrokewidth, width - mstrokewidth, height - mstrokewidth);
        int sweepangle = (int) (360 * mval / (float) mmaxval);
        canvas.drawarc(mrectf, -90, sweepangle, false, paint);
    }

    // 底部圆形
    private void drawbgcircle(canvas canvas, int width, int height) {
        int r = (width - 2 * mstrokewidth) / 2;
        paint cpaint = new paint();
        cpaint.setcolor(getresources().getcolor(mggcolor, null));
        cpaint.setstyle(paint.style.stroke);
        cpaint.setstrokewidth(mstrokewidth);
        cpaint.setantialias(true);
        canvas.drawcircle(width / 2, height / 2, r, cpaint);
    }

    @override
    protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
        super.onmeasure(widthmeasurespec, heightmeasurespec);
        int width = getsize(widthmeasurespec, 200);
        int height = getsize(heightmeasurespec, 200);
        setmeasureddimension(width, height);
    }

    private int getsize(int widthmeasurespec, int defultsize) {
        int realsize = defultsize;
        int mode = measurespec.getmode(widthmeasurespec);
        int size = measurespec.getsize(widthmeasurespec);
        switch (mode){
            case measurespec.unspecified:
                realsize = defultsize;
                break;
            case measurespec.at_most:
                realsize = size;
                break;
            case measurespec.exactly:
                realsize = size;
                break;
        }
        return realsize;
    }
}

然后在布局文件中引用：

<com.weizu.myapplication.view.myview
        android:id="@+id/myview"
        android:layout_width="150dp"
        android:layout_height="150dp"
        app:layout_constraintbottom_tobottomof="parent"
        app:layout_constraintend_toendof="parent"
        app:layout_constraintstart_tostartof="parent"
        app:layout_constrainttop_totopof="parent" />

最后，我们设置其点击效果，并开始耗时操作模拟：

myview view = findviewbyid(r.id.myview);
view.setonclicklistener(new view.onclicklistener() {
    @override
    public void onclick(view v) {
        new thread(new runnable() {
            @override
            public void run() {
                int val = 0;
                while(val <= 200){
                    view.setprogressvalue(val);
                    val++;
                    try {
                        thread.sleep(20);
                    } catch (interruptedexception e) {
                        e.printstacktrace();
                    }
                }
            }
        }).start();
    }
});

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。