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這篇文章主要為大家展示了“Android如何模擬實(shí)現(xiàn)華為系統(tǒng)升級(jí)進(jìn)度條”,內(nèi)容簡(jiǎn)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(lǐng)大家一起研究并學(xué)習(xí)一下“Android如何模擬實(shí)現(xiàn)華為系統(tǒng)升級(jí)進(jìn)度條”這篇文章吧。
下面開(kāi)始講解虛線進(jìn)度條的實(shí)現(xiàn)方法,首先看一張圖:
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(jué)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。
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(guò)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); }
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); }
接下來(lái)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); }
/** * 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:
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>
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