Android Animation(动画)---基础二(LayoutAnimationController)

LayoutAnimationController动画效果，一次出现
一、布局文件使用

1. 动画list_item_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<layoutAnimation xmlns:android="http://schemas.android.com/apk/res/android"
    android:animation="@anim/list_item_alpha"
    android:animationOrder="normal"
    android:delay="0.8"
    />

1. 每个列表项动画list_item_alpha.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
  <alpha
      android:fromAlpha="0.0"
      android:toAlpha="1.0"
      android:duration="2000"
      />
</set>

1. 主界面布局文件activity_main.xml
   特别注意要在ListView中添加android:layoutAnimation="@anim/list_item_layout"

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.mazaiting.layoutanimationcontroller.MainActivity"
    >

  <ListView
      android:id="@+id/listView"
      android:layoutAnimation="@anim/list_item_layout"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      />

  <Button
      android:text="测试"
      android:onClick="test"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      />

  <Button
      android:text="清空"
      android:onClick="clear"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      />
</LinearLayout>

1. 列表布局文件item_list.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:text="@string/app_name"
    android:textSize="20sp"
    />

1. 主界面代码

public class MainActivity extends AppCompatActivity {
  private ListView mListView;
  private static final String[] STRINGS = {
      "BruceZhang", "Alpha", "Translate", "Blanklin", "Rotate", "GreenFrank"
  };
  private ArrayAdapter<String> mAdapter;

  @Override protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mListView = (ListView) this.findViewById(R.id.listView);
    mAdapter = new ArrayAdapter<>(this, R.layout.item_list, STRINGS);
  }

  public void test(View view) {
    mListView.setAdapter(mAdapter);
  }

  public void clear(View view) {
    mListView.setAdapter(null);
  }
}

二、代码配置

1. 动画文件

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
  <alpha
      android:fromAlpha="0.0"
      android:toAlpha="1.0"
      android:duration="2000"
      />
</set>

1. 主界面布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.mazaiting.layoutanimationcontroller.MainActivity"
    >

  <ListView
      android:id="@+id/listView"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      />

  <Button
      android:text="测试"
      android:onClick="test"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      />

  <Button
      android:text="清空"
      android:onClick="clear"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      />
</LinearLayout>

1. 主界面动画设置

public class MainActivity extends AppCompatActivity {
  private ListView mListView;
  private static final String[] STRINGS = {
      "BruceZhang", "Alpha", "Translate", "Blanklin", "Rotate", "GreenFrank"
  };
  private ArrayAdapter<String> mAdapter;

  @Override protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mListView = (ListView) this.findViewById(R.id.listView);
    mAdapter = new ArrayAdapter<>(this, R.layout.item_list, STRINGS);

    // 1. 创建一个Animation对象
    Animation animation = AnimationUtils.loadAnimation(this, R.anim.list_item_alpha);
    // 2. 使用如下代码创建LayoutAnimationController对象
    LayoutAnimationController lac = new LayoutAnimationController(animation);
    // 3. 设置控件显示的顺序
    lac.setOrder(LayoutAnimationController.ORDER_RANDOM);
    // 4. 为ListView设置LayoutAnimationController尚需经
    mListView.setLayoutAnimation(lac);
  }

  public void test(View view) {
    mListView.setAdapter(mAdapter);
  }

  public void clear(View view) {
    mListView.setAdapter(null);
  }
}