android ListView向上滑动隐藏标题，下拉显示标题栏

android ListView向上滑动隐藏标题，下拉显示标题栏

标签： android开发动画

2015-08-21 00:05 2472人阅读 评论(2) 收藏 举报

分类：

android 动画（6） android ListView（6）

首先看看效果图，最下边有Demo的下载链接：

                

              

 

一、当前的Activity 重写dispatchTouchEvent 方法并且实现AnimationListener接口来达到动画的效果，代码如下：

  private boolean mIsTitleHide = false;
     private boolean mIsAnim = false;
     private float lastX = 0;
     private float lastY = 0;
     @Override
     public boolean dispatchTouchEvent(MotionEvent event)
     {
         super.dispatchTouchEvent(event);
         if (mIsAnim) {
             return false;
         }
         final int action = event.getAction();

         float x = event.getX();
         float y = event.getY();

         switch (action) {
         case MotionEvent.ACTION_DOWN:
             lastY = y;
             lastX = x;
             return false;
         case MotionEvent.ACTION_MOVE:
             float dY = Math.abs(y - lastY);
             float dX = Math.abs(x - lastX);
             boolean down = y > lastY ? true : false;
             lastY = y;
             lastX = x;
             if (dX < 8 && dY > 8 && !mIsTitleHide && !down) {
                 Animation anim = AnimationUtils.loadAnimation(
                         BlogListActivity.this, R.anim.push_top_in);
 //              anim.setFillAfter(true);
                 anim.setAnimationListener(BlogListActivity.this);
                 title_content.startAnimation(anim);
             } else if (dX < 8 && dY > 8 && mIsTitleHide && down) {
                 Animation anim = AnimationUtils.loadAnimation(
                     BlogListActivity.this, R.anim.push_top_out);
 //              anim.setFillAfter(true);
                 anim.setAnimationListener(BlogListActivity.this);
                 title_content.startAnimation(anim);
             } else {
                 return false;
             }
             mIsTitleHide = !mIsTitleHide;
             mIsAnim = true;
             break;
         default:
             return false;
         }
         return false;
     }

二、重写AnimationListener方法

 @Override
 public void onAnimationEnd(Animation animation) {
     // TODO Auto-generated method stub
     if (mIsTitleHide) {
         title.setVisibility(View.GONE);
     } else {

     }
     mIsAnim = false;
 }

 @Override
 public void onAnimationRepeat(Animation animation) {
     // TODO Auto-generated method stub

 }

 @Override
 public void onAnimationStart(Animation animation) {
     // TODO Auto-generated method stub
     title.setVisibility(View.VISIBLE);
     if (mIsTitleHide) {
         FrameLayout.LayoutParams lp = (LayoutParams) mlinear_listview
                 .getLayoutParams();
         lp.setMargins(0, 0, 0, 0);
         mlinear_listview.setLayoutParams(lp);
     } else {
         FrameLayout.LayoutParams lp = (FrameLayout.LayoutParams) title
                 .getLayoutParams();
         lp.setMargins(0, 0, 0, 0);
         title.setLayoutParams(lp);
         FrameLayout.LayoutParams lp1 = (LayoutParams) mlinear_listview
                 .getLayoutParams();
         lp1.setMargins(0,
                 getResources().getDimensionPixelSize(R.dimen.title_height),
                 0, 0);
         mlinear_listview.setLayoutParams(lp1);
     }
 }

动画 push_top_in.xml

         android:duration="300"
         android:fromYDelta="0"
         android:toYDelta="-100%"
         android:fillBefore="true"  />

动画 push_top_out.xml

 "code" class="java">"1.0" encoding="utf-8"?>
 "http://schemas.android.com/apk/res/android" >


         android:duration="300"
         android:fillBefore="true"
         android:fromYDelta="-100%"
         android:toYDelta="0" />

以上代码就可以实现具体的功能了。

Demo下载地址：http://download.csdn.net/detail/tuibiansoar/8153269