Android自定義View弧線進度控件

這個是一個以弧線為依托的進度控件，主要包括了兩個圓弧、一個圓、一個文本。

當我們點擊開始按鈕的時候，會出現一個動畫，逐漸的出現進度，好了，下面開始我們的編碼。

新建一個類，繼承自View，實現三個構造方法，接著定義變量，初始化變量的數據。代碼如下：

private Paint mArcPaint, mCirclePaint, mTextPaint, mPaint;

 private float length;

 private float mRadius;

 private float mCircleXY;

 private float mSweepValue = 0;

 private String mShowText = "0%";

 private RectF mRectF;

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

 public MViewOne(Context context, AttributeSet attrs) {
  super(context, attrs);
  initView();
 }

 public MViewOne(Context context) {
  super(context);
  initView();
 }

 private void initView() {
  mArcPaint = new Paint();
  mArcPaint.setStrokeWidth(50);
  mArcPaint.setAntiAlias(true);
  mArcPaint.setColor(Color.GREEN);
  mArcPaint.setStyle(Style.STROKE);

  mCirclePaint = new Paint();
  mCirclePaint.setColor(Color.GREEN);
  mCirclePaint.setAntiAlias(true);

  mTextPaint = new Paint();
  mTextPaint.setAntiAlias(true);
  mTextPaint.setColor(Color.RED);
  mTextPaint.setStrokeWidth(0);

  mPaint = new Paint();
  mPaint.setStrokeWidth(40);
  mPaint.setAntiAlias(true);
  mPaint.setColor(Color.YELLOW);
  mPaint.setStyle(Style.STROKE);


 }

可以看到，這裡一共定義了四個畫筆，兩個畫弧形，一個畫文本，還有一個繪制圓。

在我們的onSizeChange方法裡面，再給變量賦值。

 @Override
 protected void onSizeChanged(int w, int h, int oldw, int oldh) {
  super.onSizeChanged(w, h, oldw, oldh);
  length = w;
  mCircleXY = length / 2;
  mRadius = (float) (length * 0.5 / 2);

 }

這時候，圓的半徑、圓的起繪點，都已經有值了。

下面開始繪制

@Override
 protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  // 畫圓
  mRectF = new RectF((float) (length * 0.1), (float) (length * 0.1),
    (float) (length * 0.9), (float) (length * 0.9));
  canvas.drawCircle(mCircleXY, mCircleXY, mRadius, mCirclePaint);
  // 畫弧線
  canvas.drawArc(mRectF, 270, 360, false, mPaint);

  canvas.drawArc(mRectF, 270, mSweepValue, false, mArcPaint);

  // 繪制文字
  float textWidth = mTextPaint.measureText(mShowText); //測量字體寬度，我們需要根據字體的寬度設置在圓環中間

  canvas.drawText(mShowText, (int)(length/2-textWidth/2), (int)(length/2+textWidth/2) , mTextPaint);

 }

這個時候，全部的效果已經出來了，但是這個還是靜態的，對外暴露一個方法，讓數據可以動態的刷新

 public void setProgress(float mSweepValue) {
  float a = (float) mSweepValue;
  if (a != 0) {
   this.mSweepValue = (float) (360.0 * (a / 100.0));
   mShowText = mSweepValue + "%";
   Log.e("this.mSweepValue:", this.mSweepValue + "");
  } else {
   this.mSweepValue = 25;
   mShowText = 25 + "%";
  }

  invalidate();
 }

好了，所有的代碼都在這裡了，老規矩，最後我貼上全部的代碼：

public class MViewOne extends View {
 private Paint mArcPaint, mCirclePaint, mTextPaint, mPaint;

 private float length;

 private float mRadius;

 private float mCircleXY;

 private float mSweepValue = 0;

 private String mShowText = "0%";

 private RectF mRectF;

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

 public MViewOne(Context context, AttributeSet attrs) {
  super(context, attrs);
  initView();
 }

 public MViewOne(Context context) {
  super(context);
  initView();
 }

 private void initView() {
  mArcPaint = new Paint();
  mArcPaint.setStrokeWidth(50);
  mArcPaint.setAntiAlias(true);
  mArcPaint.setColor(Color.GREEN);
  mArcPaint.setStyle(Style.STROKE);

  mCirclePaint = new Paint();
  mCirclePaint.setColor(Color.GREEN);
  mCirclePaint.setAntiAlias(true);

  mTextPaint = new Paint();
  mTextPaint.setAntiAlias(true);
  mTextPaint.setColor(Color.RED);
  mTextPaint.setStrokeWidth(0);

  mPaint = new Paint();
  mPaint.setStrokeWidth(40);
  mPaint.setAntiAlias(true);
  mPaint.setColor(Color.YELLOW);
  mPaint.setStyle(Style.STROKE);


 }

 @Override
 protected void onSizeChanged(int w, int h, int oldw, int oldh) {
  super.onSizeChanged(w, h, oldw, oldh);
  length = w;
  mCircleXY = length / 2;
  mRadius = (float) (length * 0.5 / 2);

 }

 @Override
 protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  // 畫圓
  mRectF = new RectF((float) (length * 0.1), (float) (length * 0.1),
    (float) (length * 0.9), (float) (length * 0.9));
  canvas.drawCircle(mCircleXY, mCircleXY, mRadius, mCirclePaint);
  // 畫弧線
  canvas.drawArc(mRectF, 270, 360, false, mPaint);

  canvas.drawArc(mRectF, 270, mSweepValue, false, mArcPaint);

  // 繪制文字
  float textWidth = mTextPaint.measureText(mShowText); //測量字體寬度，我們需要根據字體的寬度設置在圓環中間

  canvas.drawText(mShowText, (int)(length/2-textWidth/2), (int)(length/2+textWidth/2) , mTextPaint);

 }

 public void setProgress(float mSweepValue) {
  float a = (float) mSweepValue;
  if (a != 0) {
   this.mSweepValue = (float) (360.0 * (a / 100.0));
   mShowText = mSweepValue + "%";
   Log.e("this.mSweepValue:", this.mSweepValue + "");
  } else {
   this.mSweepValue = 25;
   mShowText = 25 + "%";
  }

  invalidate();
 }

}

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