LayoutTransition实现显示、隐藏动画

 public class Main4Activity extends Activity {

     private TextView tv1;
     private Button button1;
     private RelativeLayout rlMain;
     private int mHeight = 0;
     int topHide;
     int topShow;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main4);

         rlMain = (RelativeLayout) findViewById(R.id.rlMain);
         tv1 = (TextView) findViewById(R.id.tv1);
         tv1.setVisibility(View.GONE);
         button1 = (Button) findViewById(R.id.button1);

         final LayoutTransition transitioner = new LayoutTransition();
         transitioner.setDuration(150);
         rlMain.setLayoutTransition(transitioner);

         mHeight = getResources().getDisplayMetrics().heightPixels
                 - getStatusBarHeight(this);

         getWindow().getDecorView().addOnLayoutChangeListener(
                 new View.OnLayoutChangeListener() {

                     @Override
                     public void onLayoutChange(View arg0, int arg1, int arg2,
                             int arg3, int arg4, int arg5, int arg6, int arg7,
                             int arg8) {

                         //计算显示时y坐标
                         topShow = mHeight - dip2px(Main4Activity.this, 70)
                                 - getActionBar().getHeight();
                         //计算隐藏时y坐标
                         topHide = mHeight - getActionBar().getHeight();

                         // VISIBLE
                         ObjectAnimator customAppearingAnim = ObjectAnimator
                                 .ofFloat(null, "y", topHide, topShow);
                         customAppearingAnim
                                 .addListener(new AnimatorListenerAdapter() {
                                     public void onAnimationEnd(Animator anim) {
                                         View view = (View) ((ObjectAnimator) anim)
                                                 .getTarget();
                                         view.setY(topShow);
                                     }
                                 });

                         // GONE
                         ObjectAnimator customDisappearingAnim = ObjectAnimator
                                 .ofFloat(null, "y", topShow, topHide);
                         customDisappearingAnim
                                 .addListener(new AnimatorListenerAdapter() {
                                     public void onAnimationEnd(Animator anim) {
                                         View view = (View) ((ObjectAnimator) anim)
                                                 .getTarget();
                                         view.setY(topHide);
                                     }
                                 });

                         transitioner.setAnimator(LayoutTransition.APPEARING,
                                 customAppearingAnim);

                         transitioner.setAnimator(LayoutTransition.DISAPPEARING,
                                 customDisappearingAnim);

                     }
                 });

         button1.setOnClickListener(new OnClickListener() {

             @Override
             public void onClick(View arg0) {

                 if (tv1.getVisibility() == View.GONE) {

                     tv1.setVisibility(View.VISIBLE);

                 } else {
                     tv1.setVisibility(View.GONE);
                 }

             }
         });

     }

     /**
      * dip转px
      * @param context
      * @param dipValue
      * @return
      */
     public static int dip2px(Context context, float dipValue) {
         final float scale = context.getResources().getDisplayMetrics().density;
         return (int) (dipValue * scale + 0.5f);
     }

     /**
      * 获取系统状态栏高度
      * @param context
      * @return
      */
     public int getStatusBarHeight(Context context) {
         Class<?> c = null;
         Object obj = null;
         Field field = null;
         int x = 0, statusBarHeight = 0;
         try {
             c = Class.forName("com.android.internal.R$dimen");
             obj = c.newInstance();
             field = c.getField("status_bar_height");
             x = Integer.parseInt(field.get(obj).toString());
             statusBarHeight = context.getResources().getDimensionPixelSize(x);
             Log.v("@@@@@@", "the status bar height is : " + statusBarHeight);
         } catch (Exception e1) {
             e1.printStackTrace();
         }
         return statusBarHeight;
     }

 }

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/rlMain"
     android:layout_width="match_parent"
     android:layout_height="match_parent" >

     <TextView
         android:id="@+id/tv1"
         android:layout_width="match_parent"
         android:layout_height="70dp"
         android:layout_alignParentBottom="true"
         android:background="@android:color/holo_red_dark"
         android:gravity="center"
         android:text="@string/hello_world"
         android:textColor="@android:color/white" />

     <Button
         android:id="@+id/button1"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_alignParentLeft="true"
         android:layout_alignParentTop="true"
         android:layout_marginLeft="44dp"
         android:text="Button" />

     <TextView
         android:id="@+id/textView1"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_alignLeft="@+id/button1"
         android:layout_below="@+id/button1"
         android:maxLines="10"
         android:scrollbars="vertical"
         android:text="TextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextView" />

 </RelativeLayout>