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通過編碼和xml文件兩種方式實現tween動畫

時間：2014-05-14 23:50:29 阅读：527 評論：0 收藏：0 [點我收藏+]

標簽：動畫 tween android animation 縮放

tween有四种動畫效果：alpha（透明）、rotate（旋轉）, translate（移動）,scale（縮放）;

可以通過硬編碼和xml文件這兩種方式來實現。

xml實現：

第一步：在項目的res文件下面新建一個文件夾名字是anim(必須)

第二步：在anim文件夹下面新建新的xml文件，在xml文件中具体设置動畫效果

第三步：在Activity中使用 AnimationUtils.loadAnimation(MainActivity.this,R.anim.xx);來獲取。

1、alpha

alpha的xml配置文件：

<?xml version="1.0" encoding="utf-8"?>
<alpha xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="5000"
    android:fillAfter="true"
    android:fromAlpha="1.0"
    android:toAlpha="0.0" >

</alph

在上面的代碼中

duration：执行这个動畫要用的时间

fillAfter：動畫执行结束后是否停留在動畫的最后一帧,默认为false,当動畫结束后图片会回到开始的位置

fromAlpha：開始時的透明度

toAlpha：結束時的透明度

alpha的View：

    <ImageView
        android:id="@+id/iv_alpha"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_launcher" />

    <Button
        android:id="@+id/bt_alpha"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/iv_alpha"
        android:text="透明" />

成員變量：

	private ImageView ivalpha, ivrotate, ivtranslate, ivscale;
	private Animation alphaAnimation, rotateAnimation, translateAnimation,
			scaleAnimation;
	private Button btalpha, btrotate, bttranslate, btscale;

btalpha的點擊事件：

			alphaAnimation = AnimationUtils.loadAnimation(MainActivity.this,
					R.anim.alpha);
			ivalpha.startAnimation(alphaAnimation);

这样一个完整的alpha動畫就完成了。

2、scale

scale的xml文件:

<?xml version="1.0" encoding="utf-8"?>
<scale xmlns:android="http://schemas.android.com/apk/res/android"
    android:fromXScale="1"
    android:fromYScale="1"
    android:toXScale="0"
    android:toYScale="0" 
    android:duration="5000">

</scale>

fromXScale、fromYScale：動畫开始时X轴和Y轴的縮放比例，比如：fromXScale为0.5，fromYScale为2，那么图片的宽就变为原来的一半，高为原来的2倍然后再开始縮放。

toXScale、toYScale: 结束时的图片X轴和Y轴的縮放比例.

編碼實現：

1、創建Animation對象

2、设置動畫的参数

3、ImageView設置setAnimation

translate

    <ImageView
        android:id="@+id/iv_translate"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@id/bt_alpha"
        android:src="@drawable/ic_launcher" />

    <Button
        android:id="@+id/bt_translate"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@id/iv_translate"
        android:text="移动" />

bttranslate的點擊事件：

			 translateAnimation=new TranslateAnimation(0, 100, 0, 100);
			 translateAnimation.setDuration(2000);
			 ivtranslate.setAnimation(translateAnimation);

TranslateAnimation(float fromXDelta, float toXDelta, float fromYDelta, float toYDelta)

fromXDelta:開始的X軸坐標位置

toXDelta:結束時x軸坐標的位置

fromYDelta:開始的y軸坐標位置

toYDelta:結束時y軸坐標的位置

这是一个图片移动的動畫效果。

rotate

			rotateAnimation=new RotateAnimation(0, 360, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
			 rotateAnimation.setDuration(2000);
			 rotateAnimation.setFillAfter(true);
			 ivrotate.setAnimation(rotateAnimation);

new RotateAnimation(fromDegrees, toDegrees, pivotXType, pivotXValue, pivotYType, pivotYValue);

fromDegrees:開始旋轉時圖片的角度

toDegrees:旋轉到什麽角度

pivotXType：以哪裏爲參考旋轉,在這裏是圖片本身

pivotXValue:以本身哪個點開始旋轉，這裏是圖片寬度的一半，也就是圖片中心點。

通過編碼和xml文件兩種方式實現tween動畫,布布扣,bubuko.com

通過編碼和xml文件兩種方式實現tween動畫

標簽：動畫 tween android animation 縮放

原文地址：http://blog.csdn.net/zhong1113/article/details/25829985

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