android top弹出框

android top弹出框的实现原理:当要弹出菜单的时候将隐藏的linearlayout以动画的形式显示出来，隐藏菜单时以动画的形式隐藏linearlayout。想到了，其实就很简单的。

<?xml version="1.0" encoding="utf-8" ?> - <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent">  <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" />   <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/button" android:text="显示/隐藏菜单" /> - <LinearLayout android:id="@+id/menu" android:layout_width="fill_parent" android:layout_height="100dp">  <TextView android:layout_width="fill_parent" android:layout_height="fill_parent" android:text="哈哈哈哈哈哈哈哈哈哈" android:gravity="center" />   </LinearLayout>  </LinearLayout>

其中可显示隐藏的linearlayout 布局时可自由发挥

package com.cng;import android.app.Activity;import android.graphics.Color;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.view.animation.Animation;import android.view.animation.TranslateAnimation;import android.widget.Button;import android.widget.LinearLayout;public class AndroidexampleActivity extends Activity {//显示   隐藏   动画Animation showaction,hideaction;//显示隐藏操作的对象LinearLayout menu;Button button;Boolean menushowed;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        menu=(LinearLayout)findViewById(R.id.menu);        menu.setBackgroundColor(Color.WHITE);        button=(Button)findViewById(R.id.button);        //显示动画        showaction=new TranslateAnimation(Animation.RELATIVE_TO_SELF,         0.0f, Animation.RELATIVE_TO_SELF, 0.0f,Animation.RELATIVE_TO_SELF,-1.0f,        Animation.RELATIVE_TO_SELF,0.0f);        showaction.setDuration(500);        //隐藏动画        hideaction=new TranslateAnimation(Animation.RELATIVE_TO_SELF,         0.0f, Animation.RELATIVE_TO_SELF, 0.0f,Animation.RELATIVE_TO_SELF,0.0f,        Animation.RELATIVE_TO_SELF,-1.0f);        hideaction.setDuration(500);        menushowed=false;        menu.setVisibility(View.GONE);        button.setOnClickListener(new OnClickListener(){@Overridepublic void onClick(View v){if(menushowed){menushowed=false;menu.startAnimation(hideaction);menu.setVisibility(View.GONE);}else {menushowed=true;menu.startAnimation(showaction);menu.setVisibility(View.VISIBLE);}}});    }}

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