android 圆角背景和通过menu键功能弹出popupwindow

package com.android.menu;

import android.app.Activity;
import android.content.Context;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.util.Log;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
import android.widget.PopupWindow;
import android.widget.TextView;

public class MenuTest extends Activity {
    private String TAG = this.getClass().getSimpleName();
    
    private int[] resArray = new int[] {
                    R.drawable.icon, R.drawable.icon,
                    R.drawable.icon, R.drawable.icon
    };
   
    private String[] title = new String[]{
                    "添加歌曲", "歌曲信息", "查找歌词", "搜索歌词"
    };
   
    private static boolean show_flag = false;
   
    private PopupWindow pw = null;
   
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
}




    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
            Log.e(TAG, "------  onCreateOptionsMenu ------");
           
            //用AlertDialog弹出menu
//            View view = LayoutInflater.from(this).inflate(R.layout.menu, null);
//            GridView grid1 = (GridView)view.findViewById(R.id.menuGridChange);
//            grid1.setAdapter(new ImageAdapter(this));
//            Builder build = new AlertDialog.Builder(this);
//            build.setView(view);
//            build.show();
           
            LayoutInflater inflater = (LayoutInflater)this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);      
            View view = inflater.inflate(R.layout.menu, null);
            GridView grid1 = (GridView)view.findViewById(R.id.menuGridChange);
            grid1.setAdapter(new ImageAdapter(this));
           
            //用Popupwindow弹出menu
            pw = new PopupWindow(view,LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);
           
            //NND, 第一个参数， 必须找个View
            pw.showAtLocation(findViewById(R.id.tv), Gravity.CENTER, 0, 300);
           
            return true;
    }




    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
            return super.onOptionsItemSelected(item);
    }




    public class ImageAdapter extends BaseAdapter {
           
            private Context context;
           
            public ImageAdapter(Context context) {
                    this.context = context;
            }
           
            @Override
            public int getCount() {
                    return resArray.length;
            }

            @Override
            public Object getItem(int arg0) {
                    return resArray[arg0];
            }

            @Override
            public long getItemId(int arg0) {
                    return arg0;
            }

            @Override
            public View getView(int arg0, View arg1, ViewGroup arg2) {
                    LinearLayout linear = new LinearLayout(context);
                    LinearLayout.LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
                    linear.setOrientation(LinearLayout.VERTICAL);
                   
                    ImageView iv = new ImageView(context);
                    iv.setImageBitmap(((BitmapDrawable)context.getResources().getDrawable(resArray[arg0])).getBitmap());
                    LinearLayout.LayoutParams params2 = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
                    params2.gravity=Gravity.CENTER;
                    linear.addView(iv, params2);
                   
                    TextView tv = new TextView(context);
                    tv.setText(title[arg0]);
                    LinearLayout.LayoutParams params3 = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
                    params3.gravity=Gravity.CENTER;
                   
                    linear.addView(tv, params3);
                   
                    return linear;
            }
    }

}

2.sharder.xml

<?xml version="1.0" encoding="UTF-8"?>
    <shape android:shape="rectangle"
      xmlns:android="http://schemas.android.com/apk/res/android">
        <solid android:color="#b4000000" />
        <stroke android:width="2.0dip" android:color="#b4ffffff" android:dashWidth="3.0dip" android:dashGap="0.0dip" />
        <padding android:left="7.0dip" android:top="7.0dip" android:right="7.0dip" android:bottom="7.0dip" />
        <corners android:radius="8.0dip" />
    </shape>

3.menu.xml

<?xml version="1.0" encoding="UTF-8"?>
    <LinearLayout
            android:orientation="vertical"
            android:layout_width="wrap_content"
            android:layout_height="fill_parent"
            xmlns:android="http://schemas.android.com/apk/res/android">
            <GridView android:gravity="center"
                    android:layout_gravity="center"
                    android:id="@+id/menuGridChange"
                    android:background="@drawable/sharder"
                    android:padding="5.0dip"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:horizontalSpacing="10.0dip"
                    android:verticalSpacing="3.0dip"
                    android:stretchMode="columnWidth"
                    android:columnWidth="60.0dip"
                    android:numColumns="auto_fit"
                    xmlns:android="http://schemas.android.com/apk/res/android" />
    </LinearLayout>