android ListView向上滑动隐藏标题，下拉显示标题栏

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：

[java] view
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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

[plain] view
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@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

[plain] view
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<?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

[java] view
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<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。

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