Android自定义View弧线进度控件

2019-12-12 06:02:16

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来源：转载

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这个是一个以弧线为依托的进度控件，主要包括了两个圆弧、一个圆、一个文本。

当我们点击开始按钮的时候，会出现一个动画，逐渐的出现进度，好了，下面开始我们的编码。

新建一个类，继承自View，实现三个构造方法，接着定义变量，初始化变量的数据。代码如下：

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，这里一共定义了四个画笔，两个画弧形，一个画文本，还有一个绘制圆。

在我们的onSizeChange方法里面，再给变量赋值。

 @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); }

这时候，圆的半径、圆的起绘点，都已经有值了。

下面开始绘制

@Override protected void onDraw(Canvas canvas) {  super.onDraw(canvas);  // 画圆  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);  // 画弧线  canvas.drawArc(mRectF, 270, 360, false, mPaint);  canvas.drawArc(mRectF, 270, mSweepValue, false, mArcPaint);  // 绘制文字  float textWidth = mTextPaint.measureText(mShowText); //测量字体宽度，我们需要根据字体的宽度设置在圆环中间  canvas.drawText(mShowText, (int)(length/2-textWidth/2), (int)(length/2+textWidth/2) , mTextPaint); }

这个时候，全部的效果已经出来了，但是这个还是静态的，对外暴露一个方法，让数据可以动态的刷新

 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，所有的代码都在这里了，老规矩，最后我贴上全部的代码：

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);  // 画圆  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);  // 画弧线  canvas.drawArc(mRectF, 270, 360, false, mPaint);  canvas.drawArc(mRectF, 270, mSweepValue, false, mArcPaint);  // 绘制文字  float textWidth = mTextPaint.measureText(mShowText); //测量字体宽度，我们需要根据字体的宽度设置在圆环中间  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(); }}

谢谢阅读，学习重在坚持，贵在坚持。

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