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Android模擬實(shí)現(xiàn)華為系統(tǒng)升級(jí)進(jìn)度條

 更新時(shí)間：2022年01月20日 16:03:41   作者：吐爾洪江Coding  
這篇文章主要介紹了如何通過Android模擬實(shí)現(xiàn)華為在系統(tǒng)升級(jí)時(shí)顯示的進(jìn)度條。文中的實(shí)現(xiàn)過程講解詳細(xì)，感興趣的小伙伴可以動(dòng)手試一試

前言

之前用華為Android系統(tǒng)的時(shí)候總是會(huì)想到這種虛線進(jìn)度條是怎么實(shí)現(xiàn)的，因?yàn)橹苯佑胏anvas的drawArc方法畫出來的是實(shí)線，所以最近在網(wǎng)上搜了很多進(jìn)度條相關(guān)的文章，也了解到了其中的原理，下面分享給大家。下面這兩篇文章是我之前寫的Android進(jìn)度條相關(guān)的文章，有興趣的朋友們可以看看：

Android實(shí)現(xiàn)絢麗的自定義進(jìn)度條

詳解Android如何自定義view實(shí)現(xiàn)圓形進(jìn)度條

下面開始講解虛線進(jìn)度條的實(shí)現(xiàn)方法，首先看一張圖：

實(shí)現(xiàn)步驟

大家可以先想想這種進(jìn)度條是怎么實(shí)現(xiàn)的？網(wǎng)上有各種各樣的方法，也有人用path的lineTo()方法實(shí)現(xiàn)了類似的效果。但是我個(gè)人覺得canvas的drawArc方法也是個(gè)不錯(cuò)的選擇，適合自己的才是最好的。

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

閱讀了大量文章，最后發(fā)現(xiàn)改變paint的樣式是最簡(jiǎn)單好用的方法。給paint設(shè)置一個(gè)effect就好了。

1.用DashPathEffect給paint加上虛線效果

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

build一下項(xiàng)目，看到的結(jié)果是這樣的：

能實(shí)現(xiàn)這個(gè)效果就大功告成了，如果看過我前面兩篇文章的朋友們就知道，后面的步驟就簡(jiǎn)單了，加個(gè)進(jìn)度條和動(dòng)畫效果就可以了。

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.畫出進(jìn)度條 

畫進(jìn)度條和畫背景完全一樣，只是畫筆顏色和小點(diǎn)個(gè)數(shù)不一樣。

代碼如下：

 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.繪制文字 

接下來是繪制文字，實(shí)現(xiàn)文字居中的效果。思路是計(jì)算出圓心，調(diào)用canvas.drawText的方法就能在canvas上面繪制文字了。這里不需要更新進(jìn)度文字，所以就更省事了。

EMUI 下面的10.0.0也是一樣的方法，只是給Y坐標(biāo)加一下55，往下移一點(diǎn)就好。

    //繪制文字
    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);
    }
 
    //繪制下方文字
    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.加入動(dòng)畫效果

  /**
     * 設(shè)置動(dòng)畫效果
     */
    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();
    }

最終效果：

完整代碼

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;
    }
 
    //初始化畫筆
    private void init() {
        mPaintBack = new Paint();//圓角矩形
        mPaintBack.setColor(getResources().getColor(R.color.gray));//圓角矩形顏色
        mPaintBack.setAntiAlias(true);// 抗鋸齒效果
        mPaintBack.setStyle(Paint.Style.STROKE);//設(shè)置畫筆樣式
        mPaintBack.setStrokeWidth(strokeWidth);//設(shè)置畫筆寬度
 
        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);
    }
 
    //繪制文字
    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);
    }
 
    //繪制下方文字
    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());
    }
 
    /**
     * 設(shè)置動(dòng)畫效果
     */
    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調(diào)用：

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

XML:

        <com.example.floatingwindow.widget.DottedLineProgressBar
            android:id="@+id/dottedLineProgressBar"
            android:layout_width="200dp"
            android:layout_height="200dp"
            android:layout_gravity="center">
        </com.example.floatingwindow.widget.DottedLineProgressBar>

 以上就是完整的實(shí)現(xiàn)過程了。

項(xiàng)目源碼：https://gitee.com/tu_erhongjiang/android-progress-bar

到此這篇關(guān)于Android模擬實(shí)現(xiàn)華為系統(tǒng)升級(jí)進(jìn)度條的文章就介紹到這了,更多相關(guān)Android進(jìn)度條內(nèi)容請(qǐng)搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！

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