直接上代码。
1.自定义view
public class RingProgressBarextends View {
//画笔对象的引用
private PaintringPaint;
private PaintringProgressPaint;
private PainttxtPaint;
private int ringColor;// 圆环的颜色
private int ringProgressColor;//圆环进度的颜色
private int textColor;//中间进度百分比的字符串的颜色
private float textSize;//中间进度百分比的字符串的字体
private float ringWidth;//圆环的宽度
private int max;//最大进度
private int progress;//当前进度
//是否显示中间的进度
private boolean textIsDisplayable;
private ContextmContext;
/**
* 进度的风格，实心或者空心
*/
private int style;
public static final int STROKE =0;
public static final int FILL =1;
//构造函数
public RingProgressBar(Context context) {
this(context,null);
}
public RingProgressBar(Context context, AttributeSet attrs) {
this(context, attrs,0);
}
public RingProgressBar(Context context, AttributeSet attrs,int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.mContext = context;
// 获取自定义的属性
initAttrs(context, attrs);
initPaint();
}
private void initAttrs(Context context, AttributeSet attrs) {
TypedArray mTypedArray = context.obtainStyledAttributes(attrs, R.styleable.RingProgressBar);
//获取自定义属性和默认值
ringColor = mTypedArray.getColor(R.styleable.RingProgressBar_ringColor, Color.GRAY);
ringProgressColor = mTypedArray.getColor(R.styleable.RingProgressBar_ringProgressColor, Color.GREEN);
textColor = mTypedArray.getColor(R.styleable.RingProgressBar_textColor, Color.GREEN);
textSize = mTypedArray.getDimension(R.styleable.RingProgressBar_textSize,16);
ringWidth = mTypedArray.getDimension(R.styleable.RingProgressBar_ringWidth,5);
max = mTypedArray.getInteger(R.styleable.RingProgressBar_max,100);
textIsDisplayable = mTypedArray.getBoolean(R.styleable.RingProgressBar_textIsDisplayable,true);
style = mTypedArray.getInt(R.styleable.RingProgressBar_style,0);
//资源回收
mTypedArray.recycle();
}
/**
* 初始化画笔
*/
private void initPaint() {
//圆环画笔
ringPaint =new Paint();
ringPaint.setColor(ringColor);//设置圆环的颜色
ringPaint.setStyle(Paint.Style.STROKE);//设置空心
ringPaint.setStrokeWidth(ringWidth);//设置圆环的宽度
ringPaint.setAntiAlias(true);//消除锯齿
//圆环进度画笔
ringProgressPaint =new Paint();
ringProgressPaint.setColor(ringProgressColor);//设置圆环的颜色
ringProgressPaint.setStrokeWidth(ringWidth);//设置圆环的宽度
ringProgressPaint.setAntiAlias(true);//消除锯齿
Log.i("devin","initPaint: styl"+style);
switch (style) {
case STROKE:
ringProgressPaint.setStyle(Paint.Style.STROKE);
break;
case FILL:
ringProgressPaint.setStyle(Paint.Style.FILL_AND_STROKE);
break;
}
//百分比文字画笔
txtPaint =new Paint();
txtPaint.setColor(textColor);
txtPaint.setTextSize(textSize);
txtPaint.setTypeface(Typeface.DEFAULT_BOLD);//设置字体
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//圆心坐标
int mXCenter = getWidth() /2;
int mYCenter = getHeight() /2;
int radius = (int) (mXCenter -ringWidth /2);//圆环的半径
//绘制圆环
canvas.drawCircle(mXCenter, mYCenter, radius,ringPaint);
//绘制圆环进度
RectF oval =new RectF(mXCenter - radius, mYCenter - radius, mXCenter
+ radius, mYCenter + radius);//用于定义的圆弧的形状和大小的界限
switch (style) {
case STROKE:
canvas.drawArc(oval, -90,360 *progress /max,false,ringProgressPaint);//根据进度画圆弧
break;
case FILL:
if (progress !=0)
canvas.drawArc(oval, -90,360 *progress /max,true,ringProgressPaint);//根据进度画圆弧
break;
}
//绘制百分比数字
//文字绘制
String txt =progress +"%";
//文字的长度
float mTxtWidth =txtPaint.measureText(txt,0, txt.length());
Log.e("tag",textIsDisplayable+","+progress+(style==STROKE));
if(textIsDisplayable &&progress!=0 &&style==STROKE){
canvas.drawText(txt, mXCenter - mTxtWidth /2, mYCenter+textSize/2,txtPaint);
}
}
/**
* 设置进度，此为线程安全控件，由于考虑多线程的问题，需要同步
* 刷新界面调用postInvalidate()能在非UI线程刷新
* @param progress
*/
public synchronized void setProgress(int progress) {
if(progress <0){
throw new IllegalArgumentException("progress not less than 0");
}
if(progress >max){
progress =max;
}
if(progress <=max){
this.progress = progress;
postInvalidate();
}
}
//**************************** 以下内容暂时没有用到*************************************//
public synchronized int getMax() {
return max;
}
/**
* 设置进度的最大值
* @param max
*/
public synchronized void setMax(int max) {
if(max <0){
throw new IllegalArgumentException("max not less than 0");
}
this.max = max;
}
/**
* 获取进度.需要同步
* @return
*/
public synchronized int getProgress() {
return progress;
}
public int getRingColor() {
return ringColor;
}
public void setRingColor(int ringColor) {
this.ringColor = ringColor;
}
public int getRingProgressColor() {
return ringProgressColor;
}
public void setRingProgressColor(int ringProgressColor) {
this.ringProgressColor = ringProgressColor;
}
public int getTextColor() {
return textColor;
}
public void setTextColor(int textColor) {
this.textColor = textColor;
}
public float getTextSize() {
return textSize;
}
public void setTextSize(float textSize) {
this.textSize = textSize;
}
public float getRingWidth() {
return ringWidth;
}
public void setRingWidth(float roundWidth) {
this.ringWidth = roundWidth;
}
}
2.布局引用
android:id="@+id/myProgress"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_marginTop="20dp"
ring:ringColor="@color/color_hilo_white"
ring:ringProgressColor="@color/color_progress_ring"
ring:textColor="@color/colorPrimaryDark"
ring:textIsDisplayable="true"
ring:ringWidth="6dp"
ring:textSize="16sp"/>
3.属性设置
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