android > PopupWindow 底部弹出框

父Activity 里面的 布局 的 最上层的 layout 需要添加一个 ID  :  android:id="@+id/main"

package t1.mft;

import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.PopupWindow;

public class T1Activity extends Activity {
    /** Called when the activity is first created. */
	private LayoutInflater inflater; 
	private View layout;
	private PopupWindow menu; 
	private Button button1;
	
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        button1 = (Button)findViewById(R.id.button1);
        initMenu();
        button1.setOnClickListener(new View.OnClickListener() {
			
			public void onClick(View v) {
				// TODO Auto-generated method stub
				show();
			}
		});
    }
    //实例化PopupWindow创建菜单  
    private void initMenu(){  
  
            //获取LayoutInflater实例  
            inflater  = (LayoutInflater) this.getSystemService(LAYOUT_INFLATER_SERVICE);  
            //获取弹出菜单的布局  
            layout = inflater.inflate(R.layout.menu,null); 
            final Button close = (Button)layout.findViewById(R.id.close); 
            
            //关闭Pop
            close.setOnClickListener(new View.OnClickListener() {
				
				public void onClick(View v) {
					// TODO Auto-generated method stub
					menu.dismiss();
				}
			});
            
            //设置popupWindow的布局  
            menu = new PopupWindow(layout, WindowManager.LayoutParams.WRAP_CONTENT,WindowManager.LayoutParams.WRAP_CONTENT);  
  
    }  
  
    //显示菜单  
    private void show(){  
           //设置位置  
            menu.showAtLocation(T1Activity.this.findViewById(R.id.main), Gravity.BOTTOM|Gravity.CENTER_HORIZONTAL,0,0); //设置在屏幕中的显示位置  
            menu.setFocusable(true); //设置PopupWindow可获得焦点
            menu.setTouchable(true); //设置PopupWindow可触摸
            menu.setOutsideTouchable(false); //设置非PopupWindow区域可触摸

    } 
    
    
}

 附带上衣个弹出框的样式

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center_horizontal"
    android:orientation="vertical"
  >

	<LinearLayout 
	    android:id="@+id/pop_layout"
	    android:layout_width="fill_parent"
	    android:layout_height="wrap_content"
	    android:gravity="center_horizontal"
	    android:orientation="vertical"
	    android:layout_alignParentBottom="true"
	     android:background="@drawable/btn_style_alert_dialog_background"
	     >
	
	
	</LinearLayout>
	
</RelativeLayout>

 其中 btn_style_alert_dialog_background  如下图

 

 

如果要实现 父级 布局被遮盖 灰掉， 

popAlert = new PopupWindow(alert_layout, WindowManager.LayoutParams.FILL_PARENT,WindowManager.LayoutParams.FILL_PARENT);

 然后弹出POP的布局文件 的 最 定居的布局文件 可以加载一个 透明的背景图片

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/alpha_50"
    android:gravity="center_horizontal"
    android:orientation="vertical"
  >