android开发(43) 动画演示，会跑的小人，从屏幕左侧跑到右侧

想做一个动画，一个会跑的小人，从屏幕右侧跑道右侧，于是做了个尝试，上图：

要完成这样需要三步：

1. 做一个 帧动画 (frame animation)，由多张图片组成，组成小人连续跑动的样子。

2. 做一个 位移动画 使得小人 从左到右产生移动。

3. 在onStart里启动动画

下面分别解释：

---第一步------------------

准备多个动作的图片，写个xml animation ：

<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android"
    android:oneshot="false" >

    <item
        android:drawable="@drawable/loading_iv_00"
        android:duration="60">
    </item>
    <item
        android:drawable="@drawable/loading_iv_01"
        android:duration="60">
    </item>
    <item
        android:drawable="@drawable/loading_iv_02"
        android:duration="60">
    </item>
    <item
        android:drawable="@drawable/loading_iv_03"
        android:duration="60">
    </item>
    <item
        android:drawable="@drawable/loading_iv_04"
        android:duration="60">
    </item>
    <item
        android:drawable="@drawable/loading_iv_05"
        android:duration="60">
    </item>
    <item
        android:drawable="@drawable/loading_iv_06"
        android:duration="60">
    </item>
    <item
        android:drawable="@drawable/loading_iv_07"
        android:duration="60">
    </item>
    <item
        android:drawable="@drawable/loading_iv_08"
        android:duration="60">
    </item>
    <item
        android:drawable="@drawable/loading_iv_09"
        android:duration="60">
    </item>
    <item
        android:drawable="@drawable/loading_iv_10"
        android:duration="60">
    </item>

</animation-list>

代码：

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        imageView1 = (ImageView) findViewById(R.id.imageView1);

        imageView1.setImageResource(R.anim.loading);
        imageView1.setVisibility(View.GONE);
        mAnimationDrawable = (AnimationDrawable) imageView1.getDrawable();
        mAnimationDrawable.setOneShot(false);
    }

---第二步-----------------------

写 位移动画 的代码：

 
        Animation translate = new TranslateAnimation(Animation.RELATIVE_TO_PARENT, -0.2f,
                Animation.RELATIVE_TO_PARENT, 1, Animation.RELATIVE_TO_SELF, 0,
                Animation.RELATIVE_TO_SELF, 0);

        translate.setDuration(3000);
        translate.setRepeatCount(Animation.INFINITE);

这句话的意思时，相对于 父容器 的x坐标移动，y轴不改变，一直循环

---第三步--------------------------

启动动画即可，贴完整代码：

package com.example.demo_run;

import android.app.Activity;
import android.graphics.drawable.AnimationDrawable;
import android.os.Bundle;
import android.view.View;
import android.view.ViewTreeObserver;
import android.view.animation.Animation;
import android.view.animation.TranslateAnimation;
import android.widget.ImageView;

public class MainActivity extends Activity {
    ImageView imageView1;
    AnimationDrawable mAnimationDrawable;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        imageView1 = (ImageView) findViewById(R.id.imageView1);

        imageView1.setImageResource(R.anim.loading);
        imageView1.setVisibility(View.GONE);
        mAnimationDrawable = (AnimationDrawable) imageView1.getDrawable();
        mAnimationDrawable.setOneShot(false);
    }

    @Override
    protected void onStart() {
        startAnimation();
        super.onStart();
    }

    private void startAnimation() {

        mAnimationDrawable.start();
        Animation translate = new TranslateAnimation(Animation.RELATIVE_TO_PARENT, -0.2f,
                Animation.RELATIVE_TO_PARENT, 1, Animation.RELATIVE_TO_SELF, 0,
                Animation.RELATIVE_TO_SELF, 0);

        translate.setDuration(3000);
        translate.setRepeatCount(Animation.INFINITE);
        imageView1.startAnimation(translate);

        imageView1.setVisibility(View.VISIBLE);
    }
}

页面布局：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#3F99C3"
    tools:context=".MainActivity" >

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true" />

</RelativeLayout>

---最后-------------------

演示代码下载。