这篇文章主要为大家详细介绍了android自定义环形loadingview效果的方法，具有一定的参考价值，感兴趣的小伙伴们可以参考一下
最近项目有要用到环形的进度条,Github上有一个类似的DashedCircularProgress控件,但是他画的进度是通过设置画笔的虚线效果来实现间隔的:progressPaint.setPathEffect(new DashPathEffect(new float[]{dashWith, dashSpace}, dashSpace));如果内层还有一层圆环,在动态设置时,内层和外层有细微的偏差.于是我在原有基础上改了一个,实现了我要的效果(设置进度时可以选择加动画或者不加动画):
控件实现:
这个控件继承RelativeLayout,在onDraw时做了两件事:
1、先画出底部的黑色环形;
2、按照当时的进度值画出对应比例的外层绿色环形.
对外提供一个接口,回调当前进度值:
public interface OnValueChangeListener {
void onValueChange(float value);
}
核心绘制类:
InternalCirclePainterImp2,绘制内层的黑色的环形:
/**
* @author Chuck
*/
public class InternalCirclePainterImp2 implements InternalCirclePainter {
private RectF internalCircle;//画出圆弧时,圆弧的外切矩形
private Paint internalCirclePaint;
private int color;
private float startAngle = 270f;
int arcQuantity=100;//等分(圆弧加间隔),比如arcQuantity=100时,表示将有100个圆弧,和100个空白间隔
float ratio=0.5f;//每段圆弧与圆弧加间隔之和的比例,ratio=0.5表示每个圆弧与相邻的间隔弧度比是1:1
private int width;
private int height;
private int internalStrokeWidth = 48;//圆环宽度
public InternalCirclePainterImp2(int color, int progressStrokeWidth, int arcQuantity,float ratio) {
this.color = color;
this.internalStrokeWidth = progressStrokeWidth;
this.arcQuantity = arcQuantity;
if(ratio>0&&ratio<1){
this.ratio = ratio;
}
init();
}
private void init() {
initExternalCirclePainter();
}
private void initExternalCirclePainter() {
internalCirclePaint = new Paint();
internalCirclePaint.setAntiAlias(true);
internalCirclePaint.setStrokeWidth(internalStrokeWidth);
internalCirclePaint.setColor(color);
internalCirclePaint.setStyle(Paint.Style.STROKE);
}
//圆弧外切矩形
private void initExternalCircle() {
internalCircle = new RectF();
float padding = internalStrokeWidth * 0.5f;
internalCircle.set(padding, padding , width - padding, height - padding);
initExternalCirclePainter();
}
@Override
public void draw(Canvas canvas) {
float eachAngle=360f/arcQuantity;
float eachArcAngle=eachAngle*ratio;
for(int i=0;i
ProgressPainterImp2,绘制内层的黑色的环形:
/**
* @author Chuck
*/
public class ProgressPainterImp2 implements ProgressPainter {
private RectF progressCircle;
private Paint progressPaint;
private int color = Color.RED;
private float startAngle = 270f;
private int internalStrokeWidth = 48;
private float min;
private float max;
private int width;
private int height;
private int currentPecent;//当前的百分比
int arcQuantity=100;//等分(圆弧加间隔),比如arcQuantity=100时,表示将有100个圆弧,和100个空白间隔
float ratio=0.5f;//每段圆弧与圆弧加间隔之和的比例,ratio=0.5表示每个圆弧与相邻的间隔弧度比是1:1
public ProgressPainterImp2(int color, float min, float max, int progressStrokeWidth, int arcQuantity,float ratio) {
this.color = color;
this.min = min;
this.max = max;
this.internalStrokeWidth = progressStrokeWidth;
this.arcQuantity = arcQuantity;
this.ratio = ratio;
init();
Log.e("ProgressPainterImp","构造函数执行");
}
private void init() {
initInternalCirclePainter();
}
private void initInternalCirclePainter() {
progressPaint = new Paint();
progressPaint.setAntiAlias(true);
progressPaint.setStrokeWidth(internalStrokeWidth);
progressPaint.setColor(color);
progressPaint.setStyle(Paint.Style.STROKE);
}
//初始化外切的那个矩形
private void initInternalCircle() {
progressCircle = new RectF();
float padding = internalStrokeWidth * 0.5f;
progressCircle.set(padding, padding , width - padding, height - padding);
initInternalCirclePainter();
}
@Override
public void draw(Canvas canvas) {
float eachAngle=360f/arcQuantity;
float eachArcAngle=eachAngle*ratio;
int quantity=2*arcQuantity*currentPecent/100;
for(int i=0;i
可以自定义的属性:
调用:
main_activity.xml:
MainActivity:
findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
try {
mDashedCircularProgress.setValue(66);//没有动画的,直接设置
} catch (Exception e) {
e.printStackTrace();
}
}
});
findViewById(R.id.button3).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
try {
mDashedCircularProgress.setValue(0);//无动画,归零
mDashedCircularProgress.setValueWithAnimation(100,2000);//带动画
} catch (Exception e) {
e.printStackTrace();
}
}
});
Github地址:https://github.com/506954774/AndroidCircularLoadingView
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