Android --- Tween动画示例（代码中定义的动画）

1、在layout目录中新建XML文件：

<span style="font-size:18px;">xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android=""
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <ImageView
        android:id="@+id/imgTween"
        android:src="@drawable/c01"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:layout_weight="1.0" />
    <Button
        android:id="@+id/btnControl"
        android:text="开始"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

LinearLayout>
span>

2、在Activity代码中写：

"font-size:18px;">package com.bison;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.AnimationSet;
import android.view.animation.RotateAnimation;
import android.view.animation.ScaleAnimation;
import android.view.animation.TranslateAnimation;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;

public class TweenAnimationDemo extends Activity implements OnClickListener {
    // 声明一个开始停止的标识符
    private boolean flags = true;
    private ImageView imgTween;
    private Button btnCtrl;
    private AnimationSet as;

    /** 初始化 */
    public void init() {
        // 声明AnimationSet
        as = new AnimationSet(true);
        // 声明Alpha、Scale、Translate、Rotate 等Animation
        AlphaAnimation aa = alphaAnim(1, 0.3f);
        ScaleAnimation sa = scaleAnim(0.2f, 1.0f, 0.2f, 1.0f, 1, 1);
        TranslateAnimation ta = translateAnim(50f, 100f, 50f, 100f);
        RotateAnimation ra = rotateAnim(0, 360);
        // 添加各种动画
        as.addAnimation(aa);
        as.addAnimation(sa);
        as.addAnimation(ta);
        as.addAnimation(ra);

        imgTween = (ImageView) findViewById(R.id.imgTween);
        imgTween.setScaleType(ScaleType.CENTER_INSIDE);

        btnCtrl = (Button) findViewById(R.id.btnControl);
        btnCtrl.setOnClickListener(this);

    }

    /** 缩放 */
    private ScaleAnimation scaleAnim(float start_x, float end_x, float start_y,
            float end_y, float x2, float y2) {
        // 开始x坐标伸缩尺寸，结束x坐标伸缩尺寸，开始y坐标伸缩尺寸，结束y坐标伸缩尺寸，x轴的百分比，y轴的百分比
        ScaleAnimation sa = new ScaleAnimation(start_x, end_x, start_y, end_y,
                x2, y2);
        sa.setDuration(3000);
        sa.setRepeatMode(Animation.REVERSE);
        sa.setRepeatCount(5);
        return sa;
    }

    /** 透明度 */
    private AlphaAnimation alphaAnim(float x, float y) {
        AlphaAnimation aa = new AlphaAnimation(x, y);
        aa.setDuration(2000);
        aa.setRepeatMode(Animation.REVERSE);
        aa.setRepeatCount(5);
        return aa;
    }

    /** 移动 */
    private TranslateAnimation translateAnim(float startX, float endX,
            float startY, float endY) {
        TranslateAnimation ta = new TranslateAnimation(startX, endX, startY,
                endY);
        ta.setDuration(3000);
        ta.setRepeatMode(Animation.REVERSE);
        ta.setRepeatCount(5);
        return ta;
    }

    /** 旋转 */
    private RotateAnimation rotateAnim(float startDegrees, float endDegrees) {
        RotateAnimation ra = new RotateAnimation(startDegrees, endDegrees);
        ra.setDuration(3000);
        ra.setRepeatMode(Animation.RESTART);
        ra.setRepeatCount(5);
        return ra;
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.tween_anim_layout);
        init();
    }

    public void onClick(View v) {
        if (flags) {
            btnCtrl.setText("停止");
            imgTween.startAnimation(as);
            flags = false;
        } else {
            btnCtrl.setText("开始");
            imgTween.clearAnimation();
            flags = true;
        }
    }
}

PS：这个方法比在XML中定义要好，可以传参，修改等，更方便操作。