Android如何模拟实现华为系统升级进度条

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下面开始讲解虚线进度条的实现方法，首先看一张图：

实现步骤

大家可以先想想这种进度条是怎么实现的？网上有各种各样的方法，也有人用path的lineTo()方法实现了类似的效果。但是我个人觉得canvas的drawArc方法也是个不错的选择，适合自己的才是最好的。

canvas.drawArc(rectF, 0, process, false, mPaint);

阅读了大量文章，最后发现改变paint的样式是最简单好用的方法。给paint设置一个effect就好了。

1.用DashPathEffect给paint加上虚线效果

DashPathEffect dashPathEffect = new DashPathEffect(new float[]{8, 6}, 0);mPaintBack.setPathEffect(dashPathEffect);

build一下项目，看到的结果是这样的：

能实现这个效果就大功告成了，如果看过我前面两篇文章的朋友们就知道，后面的步骤就简单了，加个进度条和动画效果就可以了。

private void drawBack(Canvas canvas) {        RectF rectF = new RectF(strokeWidth, strokeWidth, getWidth() - strokeWidth, getHeight() - strokeWidth);        PathEffect effects = new DashPathEffect(new float[]{8, 6}, 0);        mPaintBack.setPathEffect(effects);        canvas.drawArc(rectF, 0, 360, false, mPaintBack);    }

2.画出进度条

画进度条和画背景完全一样，只是画笔颜色和小点个数不一样。

代码如下：

 private void drawProgress(Canvas canvas) {        RectF rectF = new RectF(strokeWidth, strokeWidth, getWidth() - strokeWidth, getHeight() - strokeWidth);        PathEffect effects = new DashPathEffect(new float[]{8, 6}, 0);        mPaint.setPathEffect(effects);        canvas.drawArc(rectF, 0, process, false, mPaint);    }

3.绘制文字

接下来是绘制文字，实现文字居中的效果。思路是计算出圆心，调用canvas.drawText的方法就能在canvas上面绘制文字了。这里不需要更新进度文字，所以就更省事了。

EMUI 下面的10.0.0也是一样的方法，只是给Y坐标加一下55，往下移一点就好。

    //绘制文字    private void drawText(Canvas canvas) {        int mTxtWidth = getTextWidth();        int mTxtHeight = getTextHeight();        int x = getWidth() / 2 - mTxtWidth / 2;        int y = getHeight() / 2 + mTxtHeight / 4;        canvas.drawText(getResources().getString(R.string.defaultTextEmui), x, y, mPaintText);    }     //绘制下方文字    private void drawTextBlow(Canvas canvas) {        int mTxtWidth = getTextWidthBlow();        int mTxtHeight = getTextHeight();        int x = getWidth() / 2 - mTxtWidth / 2;        int y = getHeight() / 2 + mTxtHeight / 4 + 55;        canvas.drawText(getResources().getString(R.string.defaultTextBelow), x, y, mPaintTextLevel);    }

4.加入动画效果

  /**     * 设置动画效果     */    public void start() {        ValueAnimator valueAnimator = ValueAnimator.ofInt(0, 360);        valueAnimator.setDuration(duration);        valueAnimator.setInterpolator(new LinearInterpolator());        valueAnimator.addUpdateListener(animation -> {            process = (int) animation.getAnimatedValue();            invalidate();        });        valueAnimator.start();    }

最终效果：

完整代码

package com.example.floatingwindow.widget; import android.animation.ValueAnimator;import android.content.Context;import android.graphics.Canvas;import android.graphics.DashPathEffect;import android.graphics.Paint;import android.graphics.PathEffect;import android.graphics.RectF;import android.util.AttributeSet;import android.util.TypedValue;import android.view.View;import android.view.animation.LinearInterpolator; import androidx.annotation.Nullable; import com.example.floatingwindow.R; public class DottedLineProgressBar extends View {     private Paint mPaint;    private Paint mPaintBack;    private Paint mPaintText;    private Paint mPaintTextLevel;    private int strokeWidth = 30;    private int textSize = 22;    private int textSizeBlow = 15;    private long duration = 3500;    private int process;     public DottedLineProgressBar(Context context) {        super(context);        init();    }     public DottedLineProgressBar(Context context, @Nullable AttributeSet attrs) {        super(context, attrs);        init();    }     public DottedLineProgressBar(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init();    }     public void setStrokeWidth(int width) {        strokeWidth = width;    }     public void setTextSize(int textSize) {        this.textSize = textSize;    }     public void setDuration(long duration) {        this.duration = duration;    }     public void setTextSizeBlow(int textSizeBlow) {        this.textSizeBlow = textSizeBlow;    }     //初始化画笔    private void init() {        mPaintBack = new Paint();//圆角矩形        mPaintBack.setColor(getResources().getColor(R.color.gray));//圆角矩形颜色        mPaintBack.setAntiAlias(true);// 抗锯齿效果        mPaintBack.setStyle(Paint.Style.STROKE);//设置画笔样式        mPaintBack.setStrokeWidth(strokeWidth);//设置画笔宽度         mPaint = new Paint();        mPaint.setColor(getResources().getColor(R.color.blue));        mPaint.setAntiAlias(true);        mPaint.setStyle(Paint.Style.STROKE);        mPaint.setStrokeWidth(strokeWidth);         mPaintText = new Paint();        mPaintText.setAntiAlias(true);        mPaintText.setStyle(Paint.Style.FILL);        mPaintText.setColor(getResources().getColor(R.color.blue));        mPaintText.setTextSize(sp2px(textSize));         mPaintTextLevel = new Paint();        mPaintTextLevel.setAntiAlias(true);        mPaintTextLevel.setStyle(Paint.Style.FILL);        mPaintTextLevel.setColor(getResources().getColor(R.color.gray));        mPaintTextLevel.setTextSize(sp2px(textSizeBlow));    }     @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        drawBack(canvas);        drawProgress(canvas);        drawText(canvas);        drawTextBlow(canvas);    }     private void drawBack(Canvas canvas) {        RectF rectF = new RectF(strokeWidth, strokeWidth, getWidth() - strokeWidth, getHeight() - strokeWidth);        PathEffect effects = new DashPathEffect(new float[]{8, 6}, 0);        mPaintBack.setPathEffect(effects);        canvas.drawArc(rectF, 0, 360, false, mPaintBack);    }     private void drawProgress(Canvas canvas) {        RectF rectF = new RectF(strokeWidth, strokeWidth, getWidth() - strokeWidth, getHeight() - strokeWidth);        PathEffect effects = new DashPathEffect(new float[]{8, 6}, 0);        mPaint.setPathEffect(effects);        canvas.drawArc(rectF, 0, process, false, mPaint);    }     //绘制文字    private void drawText(Canvas canvas) {        int mTxtWidth = getTextWidth();        int mTxtHeight = getTextHeight();        int x = getWidth() / 2 - mTxtWidth / 2;        int y = getHeight() / 2 + mTxtHeight / 4;        canvas.drawText(getResources().getString(R.string.defaultTextEmui), x, y, mPaintText);    }     //绘制下方文字    private void drawTextBlow(Canvas canvas) {        int mTxtWidth = getTextWidthBlow();        int mTxtHeight = getTextHeight();        int x = getWidth() / 2 - mTxtWidth / 2;        int y = getHeight() / 2 + mTxtHeight / 4 + 55;        canvas.drawText(getResources().getString(R.string.defaultTextBelow), x, y, mPaintTextLevel);    }     private int getTextWidth() {        String text = getResources().getString(R.string.defaultTextEmui);        return (int) mPaintText.measureText(text, 0, text.length());    }     private int getTextWidthBlow() {        String text = getResources().getString(R.string.defaultTextBelow);        return (int) mPaintTextLevel.measureText(text, 0, text.length());    }     private int getTextHeight() {        Paint.FontMetrics fm = mPaintText.getFontMetrics();        return (int) Math.ceil(fm.descent - fm.ascent);    }     private int sp2px(int sp) {        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, sp,                getResources().getDisplayMetrics());    }     /**     * 设置动画效果     */    public void start() {        ValueAnimator valueAnimator = ValueAnimator.ofInt(0, 360);        valueAnimator.setDuration(duration);        valueAnimator.setInterpolator(new LinearInterpolator());        valueAnimator.addUpdateListener(animation -> {            process = (int) animation.getAnimatedValue();            invalidate();        });        valueAnimator.start();    }}

kotlin调用：

class MainActivity : AppCompatActivity() {    override fun onCreate(savedInstanceState: Bundle?) {        super.onCreate(savedInstanceState)         setContentView(R.layout.activity_main)         dottedLineProgressBar.post {            dottedLineProgressBar.start()        }    }}

XML:

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