Android 自定义view实现进度条加载效果实例代码

作者：袖梨 2022-06-25

这个其实很简单,思路是这样的,就是拿view的宽度,除以点的点的宽度+二个点之间的间距,就可以算出大概能画出几个点出来,然后就通过canvas画出点,再然后就是每隔多少时间把上面移动的点不断的去改变它的坐标就可以,

效果如下:

分析图:

代码如下:

packagecom.example.dotloadview;
importandroid.content.Context;
importandroid.graphics.Bitmap;
importandroid.graphics.BitmapFactory;
importandroid.graphics.Canvas;
importandroid.graphics.Paint;
importandroid.os.Handler;
importandroid.util.AttributeSet;
importandroid.view.View;
/**
 * Created by zhouguizhi on 6/18/15.
 */
publicclassDotLoadProgressViewextendsView {
  privatebooleanisStart =false;
  privateintdotIndex =0;//点下面的角标
  privateintdotNumber =0;
  privatePaint mPaint;
  privateintpaddingTop =50;
  privateintpaddingBottom =50;
  privateintpaddingLeft =30;
  privateintpaddingRight =30;
  privateHandler mHandler =newHandler();
  privatelongDELAY_TIME =300;
  privateBitmap bitmap;
  privateintitemDotSpace =10;//二个点之间的距离
  privateBitmap moveBitmap ;
  privateRunnable mRunnable =newRunnable() {
    @Override
    publicvoidrun() {
      if(dotNumber !=0){
        dotIndex = (dotIndex +1) % dotNumber;
      }
      invalidate();
      mHandler.postDelayed(mRunnable, DELAY_TIME);
    }
  };
  publicDotLoadProgressView(Context context, AttributeSet attrs) {
    super(context, attrs);
    moveBitmap = BitmapFactory.decodeResource(getResources(),R.drawable.active_dot);
    init();
  }
  privatevoidinit() {
    mPaint =newPaint(Paint.ANTI_ALIAS_FLAG);
    mPaint.setStyle(Paint.Style.FILL);
    mPaint.setDither(true);
    mPaint.setAntiAlias(true);
  }
  @Override
  protectedvoidonDraw(Canvas canvas) {
    super.onDraw(canvas);
    for(inti=0;i