package com.example.wireframe;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Align;
import android.graphics.Rect;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.Transformation;
/*
* 1.该view在设置属性之后时候会有数字和圆圈不断增长的效果
* 2.该view在按下和放开状态下显示不同的样式。
*/
public class CircleBar extends View {
private static final String TAG = "cn.netmoon.netmoondevicemanager.widget.CircleBar";
private RectF mColorWheelRectangle = new RectF();// 圆圈的矩形范围
private Paint mDefaultWheelPaint; // 绘制底部灰色圆圈的画笔
private Paint mColorWheelPaint;// 绘制蓝色扇形的画笔
private Paint textPaint; // 中间文字的画笔
private float mColorWheelRadius;// 圆圈普通状态下的半径
private float circleStrokeWidth;// 圆圈的线条粗细
private float pressExtraStrokeWidth;// 按下状态下增加的圆圈线条增加的粗细
private String mText;// 中间文字内容
private int mCount; // 为了达到数字增加效果而添加的变量，他和mText其实代表一个意思
private float mSweepAnglePer;// 为了达到蓝色扇形增加效果而添加的变量，他和mSweepAngle其实代表一个意思
private float mSweepAngle;// 扇形弧度
private int mTextSize;// 文字颜色
BarAnimation anim;// 动画类
public CircleBar(Context context) {
super(context);
init(null, 0);
}
public CircleBar(Context context, AttributeSet attrs) {
super(context, attrs);
init(attrs, 0);
}
public CircleBar(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(attrs, defStyle);
}
private void init(AttributeSet attrs, int defStyle) {
circleStrokeWidth = dip2px(getContext(), 10);
pressExtraStrokeWidth = dip2px(getContext(), 2);
// 构造方法调用之后，第一个调用的是init方法，在该方法
// 中初始化了各种画笔的颜色，风格等，字体大小和线条
// 粗细则使用了我自己定义的工具函数dip2px()，这样做的
// 目的是在不同分辨率的手机上，相同数值的最终显示效果
// 差别不大，比如字体大小mTextSize的初始化：
mTextSize = dip2px(getContext(), 40);
mColorWheelPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mColorWheelPaint.setColor(0xFF29a6f6);
mColorWheelPaint.setStyle(Paint.Style.STROKE);
mColorWheelPaint.setStrokeWidth(circleStrokeWidth);
mDefaultWheelPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mDefaultWheelPaint.setColor(0xFFeeefef);
mDefaultWheelPaint.setStyle(Paint.Style.STROKE);
mDefaultWheelPaint.setStrokeWidth(circleStrokeWidth);
textPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.LINEAR_TEXT_FLAG);
textPaint.setColor(0xFF333333);
textPaint.setStyle(Paint.Style.FILL_AND_STROKE);
textPaint.setTextAlign(Align.LEFT);
textPaint.setTextSize(mTextSize);
mText = "0";
mSweepAngle = 0;
anim = new BarAnimation();
anim.setDuration(2000);
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawArc(mColorWheelRectangle, -90, 360, false,
mDefaultWheelPaint);
// 在onDraw方法中我们绘制了圆圈、扇形以及文字，
// 但是绘制需要用到的一些坐标值是经过计算得出的，比如绘制扇形：
canvas.drawArc(mColorWheelRectangle, -90, mSweepAnglePer, false,
mColorWheelPaint);
Rect bounds = new Rect();
String textstr = mCount + "";
textPaint.getTextBounds(textstr, 0, textstr.length(), bounds);
canvas.drawText(textstr + "", (mColorWheelRectangle.centerX())
- (textPaint.measureText(textstr) / 2),
mColorWheelRectangle.centerY() + bounds.height() / 2, textPaint);
}
// mColorWheelRectangle是一个矩形，
// 这个矩形的上下左右边界都是在onMeasure方法中根据控件所分配的大小得出来的。
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int height = getDefaultSize(getSuggestedMinimumHeight(),
heightMeasureSpec);
int width = getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec);
int min = Math.min(width, height);
setMeasuredDimension(min, min);
mColorWheelRadius = min - circleStrokeWidth - pressExtraStrokeWidth;
mColorWheelRectangle.set(circleStrokeWidth + pressExtraStrokeWidth,
circleStrokeWidth + pressExtraStrokeWidth, mColorWheelRadius,
mColorWheelRadius);
}
@Override
public void setPressed(boolean pressed) {
Log.i(TAG, "call setPressed ");
if (pressed) {
mColorWheelPaint.setColor(0xFF165da6);
textPaint.setColor(0xFF070707);
mColorWheelPaint.setStrokeWidth(circleStrokeWidth
+ pressExtraStrokeWidth);
mDefaultWheelPaint.setStrokeWidth(circleStrokeWidth
+ pressExtraStrokeWidth);
textPaint.setTextSize(mTextSize - pressExtraStrokeWidth);
} else {
mColorWheelPaint.setColor(0xFF29a6f6);
textPaint.setColor(0xFF333333);
mColorWheelPaint.setStrokeWidth(circleStrokeWidth);
mDefaultWheelPaint.setStrokeWidth(circleStrokeWidth);
textPaint.setTextSize(mTextSize);
}
super.setPressed(pressed);
this.invalidate();
}
public void startCustomAnimation() {
this.startAnimation(anim);
}
public void setText(String text) {
mText = text;
this.startAnimation(anim);
}
public void setSweepAngle(float sweepAngle) {
mSweepAngle = sweepAngle;
}
public class BarAnimation extends Animation {
/**
* Initializes expand collapse animation, has two types, collapse (1)
* and expand (0).
*
* @param view
* The view to animate
* @param type
* The type of animation: 0 will expand from gone and 0 size
* to visible and layout size defined in xml. 1 will collapse
* view and set to gone
*/
public BarAnimation() {}
@Override
protected void applyTransformation(float interpolatedTime,
Transformation t) {
super.applyTransformation(interpolatedTime, t);
// 这个动画类利用了applyTransformation参数中
// 的interpolatedTime参数(从0到1)的变化特点，实现
// 了该View的某个属性随时间改变而改变。原理是在每
// 次系统调用animation的applyTransformation()方法时，
// 改变mSweepAnglePer，mCount的值，然后调用postInvalidate()不停的绘制view。
if (interpolatedTime < 1.0f) {
mSweepAnglePer = interpolatedTime * mSweepAngle;
mCount = (int) (interpolatedTime * Float.parseFloat(mText));
} else {
// mSweepAnglePer，mCount这两个属性只是动画过程中要用到的临时属性，
// mText和mSweepAngle才是动画结束之后表示扇形弧度和中间数值的真实值。
mSweepAnglePer = mSweepAngle;
mCount = Integer.parseInt(mText);
}
postInvalidate();
}
}
public static int dip2px(Context context, float dipValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dipValue * scale + 0.5f);
}
}
时间： 2024-10-24 14:38:30