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>

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