如何以特定的时间间隔为图片添加动画效果?

本文选自StackOverflow(简称:SOF)精选问答汇总系列文章之一,本系列文章将为读者分享国外最优质的精彩问与答,供读者学习和了解国外最新技术,本文为大家讲解在Android中,如何以特定的时间间隔为图片添加动画效果。

问:StacyM

在Android的开发过程中,我用的是Coursera类别,以下是我想要实现的静态效果图:

目前,我采用的代码是:

XML:

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<Button
        android:id="@+id/startbutton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/leftfoot"
        android:layout_alignRight="@+id/leftfoot"
        android:onClick="startRhythmandAnimation"
        android:text="@string/start_button" />
Java:
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public class Assignment3MainActivity extends Activity {
 
private View mMileTimeGoal;
 
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_assignment3_main);
    mMileTimeGoal = findViewById(R.id.miletimegoal);
}
 
public void startRhythmandAnimation () {
    String MileTime = mMileTimeGoal.getContext().toString();
    String[] time_array = MileTime.split(":");
    int hours = Integer.parseInt(time_array[0]);
    int minutes = Integer.parseInt(time_array[1]);
    int seconds = Integer.parseInt(time_array[2]);
    int duration = 3600 * hours + 60 * minutes + seconds;
    int steps_per_second = 3;
 
    int running_rate = duration * steps_per_second;
 
    View rightfoot = findViewById(R.id.rightfoot);
    View leftfoot = findViewById(R.id.leftfoot);
 
    rightfoot.setVisibility(View.VISIBLE);
    Animation anim = AnimationUtils.makeInChildBottomAnimation(this);
    rightfoot.startAnimation(anim);
 
    leftfoot.setVisibility(View.VISIBLE);
    leftfoot.startAnimation(anim);
}
我应该采用什么算法,来完成左、右脚的淡入淡出的“运动”呢?需要设定一种循环运动的定时器吗?

答:Nick Cardoso

我觉得,你可以采用如下代码:

Activity

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private Handler mHandler;   
private long mInterval = 1000;
private View mLeftfoot;
private Animation mFootAnim;
 
public void onCreate(Bundle bundle) {
   ...
   mHandler = new Handler(); //.os package class when importing
   mLeftfoot = findViewById(R.id.leftfoot);
   mFootAnim = AnimationUtils.loadAnimation(this, R.anim.foot);
   stepRecursive();
}
 
private void stepRecursive() {
    mHandler.postDelayed(new Runnable() {
        @Override
        public void run() {
            mLeftFoot.startAnimation(mFootAnim );
            stepRecursive();
        }
    }, mInterval);
}
/res/anim/foot.xml
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<?xml version="1.0" encoding="utf-8"?>
    <translate android:fromYDelta="0" android:toYDelta="-15" android:duration="400"/>
    <alpha android:fromAlpha="1.0" android:toAlpha="0" android:duration="400" />
</set>

这是我认为最直接的解决办法,当然,你可以针对特定的需要,再完善以上的代码。

原文链接:http://stackoverflow.com/questions/21667916/android-how-can-i-make-an-animation-of-an-image-occur-at-a-certain-interval 

posted @ 2014-02-11 19:28  一个学渣  阅读(399)  评论(0编辑  收藏  举报

 

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