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*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()
		{
			
			@Override
			public 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);
				}
			}
		});
    }
}