Android逐幀動畫、屬性動畫的簡單實作

    這裡我們實作一個簡單的逐幀動畫，即一組圖檔快速輪換的動畫效果。

    動畫的布局檔案：（這個xml檔案在AS2.2隻能放在drawable目錄下，低版本或許可以放在anim目錄）

<span style="font-size:14px;"><pre name="code" class="java"><?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android"
android:oneshot="false"> <strong><span style="color:#cc0000;"><!-- onshot 是否隻輪詢一次--></span>
   <span style="color:#cc0000;"> <!-- 每個Item代表一幀，即一張圖檔。   duration 每幀的持續時間--></span></strong>
<item android:drawable="@drawable/order_loading_1" android:duration="150" />
<item android:drawable="@drawable/order_loading_2" android:duration="150" />
<item android:drawable="@drawable/order_loading_3" android:duration="150" />
<item android:drawable="@drawable/order_loading_4" android:duration="150" />
</animation-list></span>
           

    頁面的布局檔案：（使用ImageView作為動畫載體）

<span style="font-size:14px;">    <ImageView
        android:visibility="gone"
        android:layout_centerInParent="true"
        android:layout_marginBottom="50dp"
        android:id="@+id/img_loading"
        android:layout_width="145dp"
        android:layout_height="138dp" /></span>
           

    代碼實作：

<span style="font-size:14px;">    /**
     * 初始化動畫
     */
    private void initAnim() {
        imgLoading.setBackgroundResource(R.drawable.order_loading);
        animLoading = (AnimationDrawable) imgLoading.getBackground();
    }</span>
           

<span style="font-size:14px;"><pre name="code" class="java">    // 展示 并開始動畫
    animLoading.start();

    // 結束動畫
    if (animLoading.isRunning()) {
        animLoading.stop();
    }</span>
           

    注意：在這裡釋放動畫圖檔資源會報錯，圖檔資源已釋放。自帶的回收機制會自動進行回收。

    下面繼續實作簡單的屬性動畫，并帶聲音。    

    動畫的布局檔案：

<div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;"><?xml version="1.0" encoding="utf-8"?></span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;"><set xmlns:android="http://schemas.android.com/apk/res/android"></span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">    <translate</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">        android:duration="400"</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">        android:fromXDelta="0"</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">        android:fromYDelta="0"</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">        android:toXDelta="0"</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">        android:toYDelta="-580" /></span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">    <scale android:duration="400"</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">        android:fromXScale="1"</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">        android:fromYScale="1"</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">        android:pivotX="50%"</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">        android:pivotY="50%"</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">        android:toXScale="1.3"</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">        android:toYScale="1.3" /></span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;"></set></span></div>
           

    頁面的布局檔案：（使用ImageView作為動畫載體）

<div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">        <ImageView</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">            android:id="@+id/rocket"</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">            android:layout_width="wrap_content"</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">            android:layout_height="wrap_content"</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">            android:layout_alignParentBottom="true"</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">            android:layout_centerHorizontal="true"</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">            android:src="@drawable/rocket"/></span></div>
           

    代碼實作：

<span style="font-size:14px;">    ImageView rocket;//火箭</span>
           

<span style="font-size:14px;">    SoundPool soundPool;// 聲音</span>
           

<span style="font-size:14px;">    /**
     * 初始化動畫
     */
    private void initAnim() {</span><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;"><span style="white-space:pre">	</span>    Animation animation = AnimationUtils.loadAnimation(getActivity(), R.anim.rocket_anim);</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">            animation.setAnimationListener(new Animation.AnimationListener() {</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">                @Override</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">                public void onAnimationStart(Animation animation) {</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">                    rocket.setVisibility(View.VISIBLE);</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">                    // 播放音效</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">                    soundPool.play(1, 1, 1, 0, 0, 1);</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">                }</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">                @Override</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">                public void onAnimationEnd(Animation animation) {</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">                    rocket.setVisibility(View.GONE);</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">                }</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">                @Override</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">                public void onAnimationRepeat(Animation animation) {</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">                }</span></div><div yne-bulb-block="paragraph" style="white-space: pre-wrap; line-height: 1.5;"><span style="font-size:14px;">            });</span></div><span style="font-size:14px;">    }</span>
           

<span style="font-size:14px;">   //配置火箭聲音
   private void loadSound() {
       soundPool = new SoundPool(2, AudioManager.STREAM_SYSTEM, 5);
       soundPool.load(getActivity(), R.raw.rocket, 1);
   }
</span>
           

<span style="font-size:14px;">    // 開始動畫         
   rocket.startAnimation(animation);
</span>
           

注意：将聲音檔案放在raw檔案下