Android自定義View圓形進度條控件（三）

更新時間：2020年05月16日 10:52:25 作者：猴菇先生

這篇文章主要為大家詳細介紹了Android自定義View圓形進度條控件的相關(guān)資料，文中示例代碼介紹的非常詳細，具有一定的參考價值，感興趣的小伙伴們可以參考一下

繼續(xù)練習自定義View，這次帶來的圓形進度條控件與之前的圓形百分比控件大同小異，這次涉及到了漸變渲染以及畫布旋轉(zhuǎn)等知識點，效果如下：

雖然步驟類似，但是我還是要寫，畢竟基礎(chǔ)的東西就是要多練

1、在res/values文件夾下新建attrs.xml文件，編寫自定義屬性：

<?xml version="1.0" encoding="utf-8"?>
<resources>
 <declare-styleable name="CircleProgressView">
 <!-- 弧線寬度 -->
 <attr name="arcWidth" format="dimension" />
 <!-- 刻度個數(shù) -->
 <attr name="scaleCount" format="integer" />
 <!-- 漸變起始顏色 -->
 <attr name="startColor" format="color" />
 <!-- 漸變終止顏色 -->
 <attr name="endColor" format="color" />
 <!-- 標簽說明文本 -->
 <attr name="labelText" format="string" />
 <!-- 文本顏色 -->
 <attr name="textColor" format="color" />
 <!-- 百分比文本字體大小 -->
 <attr name="progressTextSize" format="dimension" />
 <!-- 標簽說明字體大小 -->
 <attr name="labelTextSize" format="dimension" />
 </declare-styleable>
</resources>

2、新建CircleProgressView繼承View，重寫構(gòu)造方法：

 public CircleProgressView(Context context) {
 this(context, null);
 }

 public CircleProgressView(Context context, AttributeSet attrs) {
 this(context, attrs, 0);
 }

 public CircleProgressView(Context context, AttributeSet attrs, int defStyleAttr) {
 super(context, attrs, defStyleAttr);
 }

3、在第三個構(gòu)造方法中獲取自定義屬性的值：

 TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.CircleProgressView, defStyleAttr, 0);
 mArcWidth = ta.getDimension(R.styleable.CircleProgressView_arcWidth, DensityUtils.dp2px(context, 8));
 mScaleCount = ta.getInteger(R.styleable.CircleProgressView_scaleCount, 24);
 mStartColor = ta.getColor(R.styleable.CircleProgressView_startColor, Color.parseColor("#3FC199"));
 mEndColor = ta.getColor(R.styleable.CircleProgressView_endColor, Color.parseColor("#3294C1"));
 mColorArray = new int[]{mStartColor, mEndColor};
 mLabelText = ta.getString(R.styleable.CircleProgressView_labelText);
 mTextColor = ta.getColor(R.styleable.CircleProgressView_textColor, Color.parseColor("#4F5F6F"));
 mProgressTextSize = ta.getDimension(R.styleable.CircleProgressView_progressTextSize, 160);
 mLabelTextSize = ta.getDimension(R.styleable.CircleProgressView_labelTextSize, 64);
 ta.recycle();

4、創(chuàng)建畫圖所使用的對象，如Paint、Rect、RectF：

 mArcBackPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
 mArcBackPaint.setStyle(Paint.Style.STROKE);
 mArcBackPaint.setStrokeWidth(mArcWidth);
 mArcBackPaint.setColor(Color.LTGRAY);

 mArcForePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
 mArcForePaint.setStyle(Paint.Style.STROKE);
 mArcForePaint.setStrokeWidth(mArcWidth);

 mArcRectF = new RectF();

 mLinePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
 mLinePaint.setStyle(Paint.Style.STROKE);
 mLinePaint.setColor(Color.WHITE);
 mLinePaint.setStrokeWidth(DensityUtils.dp2px(context, 2));

 mProgressTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
 mProgressTextPaint.setStyle(Paint.Style.FILL);
 mProgressTextPaint.setColor(mTextColor);
 mProgressTextPaint.setTextSize(mProgressTextSize);

 mLabelTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
 mLabelTextPaint.setStyle(Paint.Style.FILL);
 mLabelTextPaint.setColor(mTextColor);
 mLabelTextPaint.setTextSize(mLabelTextSize);

 mTextRect = new Rect();

5、重寫onMeasure()方法，計算自定義View的寬高：

 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
 setMeasuredDimension(measuredDimension(widthMeasureSpec), measuredDimension(heightMeasureSpec));
 }

 private int measuredDimension(int measureSpec) {
 int result;
 int mode = MeasureSpec.getMode(measureSpec);
 int size = MeasureSpec.getSize(measureSpec);
 if (mode == MeasureSpec.EXACTLY) {
 result = size;
 } else {
 result = 800;
 if (mode == MeasureSpec.AT_MOST) {
 result = Math.min(result, size);
 }
 }
 return result;
 }

6、重寫onDraw()方法，繪制圓弧、刻度線和百分比文本、標簽說明文本，注意坐標的計算：

 @Override
 protected void onDraw(Canvas canvas) {
 super.onDraw(canvas);
 mArcRectF.set(mArcWidth / 2, mArcWidth / 2, getWidth() - mArcWidth / 2, getHeight() - mArcWidth / 2);
 //畫背景弧線
 canvas.drawArc(mArcRectF, -90, 360, false, mArcBackPaint);
 //設置漸變渲染
 LinearGradient linearGradient = new LinearGradient(getWidth() / 2, 0, getWidth() / 2, getHeight(), mColorArray, null, Shader.TileMode.CLAMP);
 mArcForePaint.setShader(linearGradient);
 //畫百分比值弧線
 canvas.drawArc(mArcRectF, -90, mSweepAngle, false, mArcForePaint);
 //畫刻度線
 for (int i = 0; i < mScaleCount; i++) {
 canvas.drawLine(getWidth() / 2, 0, getWidth() / 2, mArcWidth, mLinePaint);
 //旋轉(zhuǎn)畫布
 canvas.rotate(360 / mScaleCount, getWidth() / 2, getHeight() / 2);
 }
 //畫百分比文本
 String progressText = mProgress + "%";
 mProgressTextPaint.getTextBounds(progressText, 0, progressText.length(), mTextRect);
 float progressTextWidth = mTextRect.width();
 float progressTextHeight = mTextRect.height();
 canvas.drawText(progressText, getWidth() / 2 - progressTextWidth / 2,
 getHeight() / 2 + progressTextHeight / 2, mProgressTextPaint);
 //畫標簽說明文本
 mLabelTextPaint.getTextBounds(mLabelText, 0, mLabelText.length(), mTextRect);
 canvas.drawText(mLabelText, getWidth() / 2 - mTextRect.width() / 2,
 getHeight() / 2 - progressTextHeight / 2 - mTextRect.height(), mLabelTextPaint);
 }

7、暴露一個動態(tài)設置百分比的方法：

 public void setProgress(float progress) {
 Log.e("--> ", progress + "");
 ValueAnimator anim = ValueAnimator.ofFloat(mProgress, progress);
 anim.setDuration((long) (Math.abs(mProgress - progress) * 20));
 anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
 @Override
 public void onAnimationUpdate(ValueAnimator animation) {
 mProgress = (float) animation.getAnimatedValue();
 mSweepAngle = mProgress * 360 / 100;
 mProgress = (float) (Math.round(mProgress * 10)) / 10;//四舍五入保留到小數(shù)點后兩位
 invalidate();
 }
 });
 anim.start();
 }

8、在activity_main.xml布局文件中使用該View：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:cpv="http://schemas.android.com/apk/res-auto"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:paddingBottom="@dimen/activity_vertical_margin"
 android:paddingLeft="@dimen/activity_horizontal_margin"
 android:paddingRight="@dimen/activity_horizontal_margin"
 android:paddingTop="@dimen/activity_vertical_margin"
 tools:context=".MainActivity">

 <com.monkey.circleprogressview.CircleProgressView
 android:id="@+id/circle_progress_view"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_centerInParent="true"
 cpv:arcWidth="8dp"
 cpv:endColor="#126b94"
 cpv:labelText="學習進度"
 cpv:labelTextSize="20sp"
 cpv:progressTextSize="55sp"
 cpv:scaleCount="24"
 cpv:startColor="#12d699"
 cpv:textColor="#4F5F6F" />
</RelativeLayout>

9、在MainActivity中設置監(jiān)聽，傳入百分比：

 final CircleProgressView view = (CircleProgressView) findViewById(R.id.circle_progress_view);
 view.setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 float progress = (float) (Math.random() * 100);
 view.setProgress(progress);
 }
 });

代碼下載地址

以上就是本文的全部內(nèi)容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。

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