android--AnimationDrawable实现等待动画效果

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例如登陆页面中需要显示等待动画， Animation Drawable可以让你把一系列的图片像幻灯片一样一张一张地显示在屏幕上。虽然Animation Drawable的效果看起来像动画一样，但在实际的代码处理中应该将其视为Drawable，而事实上它继承于Drawable，其XML配置文件也是放置在res/drawable目录下。

代码：login_loading.xml

<?xml version="1.0" encoding="UTF-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android"
 	android:oneshot="false">
    <item android:duration="100">
        <layer-list>
            <item android:drawable="@drawable/login_loading_00" />
            <item android:drawable="@drawable/login_loading_10" />
        </layer-list>
    </item>
    <item android:duration="100">
        <layer-list>
            <item android:drawable="@drawable/login_loading_01" />
            <item android:drawable="@drawable/login_loading_11" />
        </layer-list>
    </item>
    <item android:duration="100">
        <layer-list>
            <item android:drawable="@drawable/login_loading_02" />
            <item android:drawable="@drawable/login_loading_12" />
        </layer-list>
    </item>
    <item android:duration="100">
        <layer-list>
            <item android:drawable="@drawable/login_loading_03" />
            <item android:drawable="@drawable/login_loading_13" />
        </layer-list>
    </item>
    <item android:duration="100">
        <layer-list>
            <item android:drawable="@drawable/login_loading_04" />
            <item android:drawable="@drawable/login_loading_14" />
        </layer-list>
    </item>
    <item android:duration="100">
        <layer-list>
            <item android:drawable="@drawable/login_loading_05" />
            <item android:drawable="@drawable/login_loading_15" />
        </layer-list>
    </item>
    <item android:duration="100">
        <layer-list>
            <item android:drawable="@drawable/login_loading_06" />
            <item android:drawable="@drawable/login_loading_16" />
        </layer-list>
    </item>
    <item android:duration="100">
        <layer-list>
            <item android:drawable="@drawable/login_loading_07" />
            <item android:drawable="@drawable/login_loading_17" />
        </layer-list>
    </item>
    <item android:duration="100">
        <layer-list>
            <item android:drawable="@drawable/login_loading_08" />
            <item android:drawable="@drawable/login_loading_18" />
        </layer-list>
    </item>
    <item android:duration="100">
        <layer-list>
            <item android:drawable="@drawable/login_loading_09" />
            <item android:drawable="@drawable/login_loading_19" />
        </layer-list>
    </item>
</animation-list>

注释：（1）android:duration="100" 每个帧都会延时100ms

（2）如果android:oneshot属性设置为true，那么该Animation Drawable只会运行一次，并最后会定格在最后一帧上，要是android:oneshot属性设为false，那么便会无限循环地显示上面的这几个帧

MainActivity.java

package com.tbx.android.waiting;

import com.tbx.android.R;

public class MainActivity extends Activity {
	
	private Button button ;
	private View loginLoading;
	private AnimationDrawable loadingAnimation;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        button = (Button)findViewById(R.id.button1);
        loginLoading = (View)findViewById(R.id.login_loading);
        
        button.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				  if(loginLoading.getVisibility() == View.GONE){
					  loginLoading.setVisibility(View.VISIBLE);
					  loadingAnimation = (AnimationDrawable)loginLoading.getBackground();
				      loadingAnimation.start();
				  }else{
					  if(loadingAnimation!=null){
						  loadingAnimation.stop();
						  loginLoading.setVisibility(View.GONE);
					  }
				  }
			}
		});
        
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
}

注释： 开始播放动画  loadingAnimation.start()

mian.xml

<LinearLayout 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" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="@string/hello_world"
        tools:context=".MainActivity" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_marginRight="20dp"
        android:layout_marginTop="48dp"
        android:layout_toLeftOf="@+id/textView1"
        android:text="Button" />
      <View 
         android:id="@+id/login_loading" 
         android:layout_width="135.0dip" 
         android:layout_height="135.0dip"
         android:layout_gravity="center" 
         android:visibility="gone"
         android:background="@anim/login_loading"/>

</LinearLayout>

ok，运行后可以看到效果了。