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這篇文章主要為大家展示了“Android如何模擬實現華為系統升級進度條”，內容簡而易懂，條理清晰，希望能夠幫助大家解決疑惑，下面讓小編帶領大家一起研究并學習一下“Android如何模擬實現華為系統升級進度條”這篇文章吧。
下面開始講解虛線進度條的實現方法，首先看一張圖：
大家可以先想想這種進度條是怎么實現的？網上有各種各樣的方法，也有人用path的lineTo()方法實現了類似的效果。但是我個人覺得canvas的drawArc方法也是個不錯的選擇，適合自己的才是最好的。
canvas.drawArc(rectF, 0, process, false, mPaint);
閱讀了大量文章，最后發現改變paint的樣式是最簡單好用的方法。給paint設置一個effect就好了。
DashPathEffect dashPathEffect = new DashPathEffect(new float[]{8, 6}, 0);
mPaintBack.setPathEffect(dashPathEffect);build一下項目，看到的結果是這樣的：
能實現這個效果就大功告成了，如果看過我前面兩篇文章的朋友們就知道，后面的步驟就簡單了，加個進度條和動畫效果就可以了。
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);
}畫進度條和畫背景完全一樣，只是畫筆顏色和小點個數不一樣。
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);
}接下來是繪制文字，實現文字居中的效果。思路是計算出圓心，調用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坐標加一下55，往下移一點就好。
//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);
} /**
* 設置動畫效果
*/
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：
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);//設置畫筆樣式
mPaintBack.setStrokeWidth(strokeWidth);//設置畫筆寬度
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());
}
/**
* 設置動畫效果
*/
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>
以上是“Android如何模擬實現華為系統升級進度條”這篇文章的所有內容，感謝各位的閱讀！相信大家都有了一定的了解，希望分享的內容對大家有所幫助，如果還想學習更多知識，歡迎關注億速云行業資訊頻道！
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