這篇文章主要為大家詳細介紹了Android自訂環形LoadingView效果的方法,具有一定的參考價值,有興趣的小夥伴們可以參考一下
最近專案有要用到環形的進度條,Github上有一個類似的DashedCircularProgress控制,但是他畫的進度是透過設定畫筆的虛線效果來實現間隔的:progressPaint.setPathEffect(new DashPathEffect(new float[]{dashWith, dashSpace}, dashSpace));如果內層還有一層圓環,在動態設定時,內層和外層有細微的偏差.於是我在原有基礎上改了一個,實現了我要的效果(設定進度時可以選擇加動畫或不加動畫):
控制實作:
這個控制項繼承RelativeLayout,在onDraw時做了兩件事:
1、先畫出底部的黑色環形;
2、按照當時的進度值畫出對應比例的外層綠色環形.
對外提供一個接口,回調當前進度值:
public interface OnValueChangeListener { void onValueChange(float value); }
核心繪製類別:
InternalCirclePainterImp2,繪製內層的黑色的環形:
/** * @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 登入後複製
ProgressPainterImp2,繪製內層的黑色的環形:
/** * @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 登入後複製
#可以自訂的屬性:
#呼叫:
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位址:https://github.com/506954774/AndroidCircularLoadingView
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