如何在Android中创建"填充"动画

Question

我正在尝试在Android中的形状上创建"填充"动画.它应该开始完全不可见,然后逐渐从底部"填满",如下所示:

我特意尝试动画的是一个像这样的圆圈:

<?xml version="1.0" encoding="utf-8"?>
<shape
   xmlns:android="http://schemas.android.com/apk/res/android"
   android:shape="oval">

   <solid 
       android:color="#666666"/>

   <size 
       android:width="120dp"
       android:height="120dp"/>
</shape>

我已经检查了AlphaAnimation,RotateAnimation,ScaleAnimation和TranslateAnimation(动画的子类),但我找不到使用它们的方法.

Answer 1

以下是我最终解决的方法:

我从github https://github.com/lzyzsd/CircleProgress中包含了这个库,其中包含一个循环进度条(CircleProgress).我添加了一个倒计时器来逐渐增加它显示的"进度"

这是代码:

final CircleProgress circularProgress =(CircleProgress)findViewById(R.id.circleProgress);

//Hides the text and the part of the circle which should not be shown
circularProgress.setUnfinishedColor(Color.parseColor("#00000000"));
circularProgress.setTextColor(Color.parseColor("#00000000"));

//Makes the circle red
circularProgress.setFinishedColor("#FF0000");

final int timeToCountDownMilis = 10000;
circularProgress.setMax(timeToCountDownMilis);

//Initiates and starts the countdowntimer which gradually increases the "progress" in the progress bar
new CountDownTimer(timeToCountDownMilis,70){

    onTick(long milisUntilFinished){
       circularProgress.setProgress(timeToCountDownMilis-(int)milisUntilFinished);
    }

    onFinish(){
    }
}.start();

感谢Stan指点我的圆形进度条吧!