动画-- 按钮按序列（从小到大）显示

 1 import android.app.Activity;
 2 import android.app.Fragment;
 3 import android.os.Bundle;
 4 import android.view.LayoutInflater;
 5 import android.view.View;
 6 import android.view.ViewGroup;
 7 import android.view.animation.LayoutAnimationController;
 8 import android.view.animation.ScaleAnimation;
 9 import android.widget.LinearLayout;
10
11 public class MainActivity extends Activity {
12
13     @Override
14     protected void onCreate(Bundle savedInstanceState) {
15         super.onCreate(savedInstanceState);
16         setContentView(R.layout.activity_main);
17
18         if (savedInstanceState == null) {
19             getFragmentManager().beginTransaction()
20                     .add(R.id.container, new PlaceholderFragment()).commit();
21         }
22     }
23
25     public static class PlaceholderFragment extends Fragment {
26
27         public PlaceholderFragment() {
28         }
29
30         @Override
31         public View onCreateView(LayoutInflater inflater, ViewGroup container,
32                 Bundle savedInstanceState) {
33
34             final LinearLayout rootView = (LinearLayout) inflater.inflate(
35                     R.layout.fragment_main, container, false);
36
37             /**
38              *  ***  ScaleAnimation 缩放动画效果  ***
39              * float fromX 动画起始时 X坐标上的伸缩尺寸。
40              * float toX 动画结束时 X坐标上的伸缩尺寸。
41              * float fromY 动画起始时Y坐标上的伸缩尺寸。
42              * float toY 动画结束时Y坐标上的伸缩尺寸。
43              */
44             ScaleAnimation sa = new ScaleAnimation(0, 1, 0, 1);
45             sa.setDuration(5000); // 5秒 设置持续时间
46
47             /**
48              * LayoutAnimationController 控制一组控件按照规定显示.
49              * delay 推迟。
50              */
51             LayoutAnimationController lac = new LayoutAnimationController(sa,
52                     0.5f);
53
54             /**
55              * LayoutAnimationController.ORDER_NORMAL    顺序显示
56              * LayoutAnimationController.ORDER_REVERSE   反显示(从下往上)
57              * LayoutAnimationController.ORDER_RANDOM    随机显示
58              */
59             lac.setOrder(LayoutAnimationController.ORDER_REVERSE);
60
61             rootView.setLayoutAnimation(lac);
62
63             return rootView;
64         }
65     }
66
67 }

activity_main.xml

1 <FrameLayout   xmlns:android="http://schemas.android.com/apk/res/android"
2     xmlns:tools="http://schemas.android.com/tools"
3     android:id="@+id/container"
4     android:layout_width="match_parent"
5     android:layout_height="match_parent" />

fragment_main.xml

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical"
 6     tools:context="com.jikexueyuan.layoutanimationinlinearlayout.MainActivity$PlaceholderFragment" >
 7
 8     <Button
 9         android:id="@+id/Button05"
10         android:layout_width="wrap_content"
11         android:layout_height="wrap_content"
12         android:text="Button" />
13
14     <Button
15         android:id="@+id/Button04"
16         android:layout_width="wrap_content"
17         android:layout_height="wrap_content"
18         android:text="Button" />
19
20     <Button
21         android:id="@+id/Button03"
22         android:layout_width="wrap_content"
23         android:layout_height="wrap_content"
24         android:text="Button" />
25
26     <Button
27         android:id="@+id/Button02"
28         android:layout_width="wrap_content"
29         android:layout_height="wrap_content"
30         android:text="Button" />
31
32     <Button
33         android:id="@+id/Button01"
34         android:layout_width="wrap_content"
35         android:layout_height="wrap_content"
36         android:text="Button" />
37
38     <Button
39         android:id="@+id/button1"
40         android:layout_width="wrap_content"
41         android:layout_height="wrap_content"
42         android:text="Button" />
43
44 </LinearLayout>