android ListView向上滑动隐藏标题，下拉显示标题栏

转自http://blog.csdn.net/tuibiansoar/article/details/9668857

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

 

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >

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

</set>

 

 

动画 push_top_out.xml

<pre name="code" class="java"><?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >

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

</set>

 

以上代码就可以实现具体的功能了。