Android(安卓)通过AlertDialog创建伪菜单

Android 通过AlertDialog创建伪菜单

1）效果图如下

单击Menu键跳出AlertDialog效果图如下

单击GridView中的“更多”选项效果图如下

2）具体代码如下

1.修改MainActivity.java代码如下

package com.example.androiddemo3;import java.util.ArrayList;import java.util.HashMap;import android.os.Bundle;import android.R.integer;import android.app.Activity;import android.app.AlertDialog;import android.content.DialogInterface;import android.support.v4.widget.SimpleCursorAdapter;import android.view.Gravity;import android.view.KeyEvent;import android.view.Menu;import android.view.View;import android.widget.AdapterView;import android.widget.GridView;import android.widget.SimpleAdapter;public class MainActivity extends Activity {private AlertDialog alertDialog=null;private GridView gridView1=null;/*菜单文字1*/private String[] menu_name_array1={"菜单1","菜单2","菜单3","菜单4","菜单5","更多"};/*菜单图片1*/private int[] menu_image_array1={R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher};/*菜单文字2*/private String[] menu_name_array2={"菜单6","菜单7","菜单8","菜单9","菜单10","返回"};/*菜单图片2*/private int[] menu_image_array2={R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);/*将SimpleAdapter和GridView绑定*/gridView1=new GridView(this);gridView1.setNumColumns(3);gridView1.setAdapter(getAdapter(menu_name_array1, menu_image_array1));/*单击GridView上的菜单（这里主要演示的是“更多”，“返回”）触发事件*/gridView1.setOnItemClickListener(new GridView.OnItemClickListener() {public void onItemClick(AdapterView<?> parent, View view,int position,long arg3){  HashMap<String, Object> item=(HashMap<String, Object>)parent.getItemAtPosition(position);String name=item.get("name").toString();if(name.equals("更多")){gridView1.setAdapter(getAdapter(menu_name_array2, menu_image_array2));}else if(name.equals("返回")){gridView1.setAdapter(getAdapter(menu_name_array1, menu_image_array1));}else{}}});/*创建AlertDialog*/alertDialog=new AlertDialog.Builder(this).setView(gridView1).create();/*当打开AlertDialog后监听按钮（“菜单”，“回车”）事件关闭AlertDialog*/alertDialog.setOnKeyListener(new AlertDialog.OnKeyListener() {@Overridepublic boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {if(keyCode==KeyEvent.KEYCODE_MENU||keyCode==KeyEvent.KEYCODE_BACK){//监听按钮alertDialog.dismiss();}return false;}});}/*将ArrayList中的数据和SimpleAdapter绑定*/private SimpleAdapter getAdapter(String[] names,int[] images){ArrayList<HashMap<String, Object>> items=getData(names, images);SimpleAdapter adapter=new SimpleAdapter(this, items, R.layout.item_menu, new String[]{"name","image"}, new int[]{R.id.item_name,R.id.item_image});return adapter;}/*将菜单文字和菜单图片存放到ArrayList*/private ArrayList<HashMap<String, Object>> getData(String[] names,int[] images){ArrayList<HashMap<String, Object>> items=new ArrayList<HashMap<String,Object>>();for(int i=0;i<names.length;i++){HashMap<String, Object> item=new HashMap<String, Object>();item.put("name", names[i]);item.put("image", images[i]);items.add(item);}return items;}@Override/*重写打开菜单按钮事件，显示AlertDialog*/public boolean onMenuOpened(int featureId, Menu menu) {if(alertDialog==null){alertDialog=new AlertDialog.Builder(this).setView(gridView1).show();}else{alertDialog.show();}return false;//返回true则显示系统menu}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}}

2在layout创建item_menu.xml作为GridView的样式

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/RelativeLayout_Item"android:layout_width="fill_parent" android:layout_height="wrap_content"android:paddingBottom="5dip"><ImageView android:id="@+id/item_image"android:layout_centerHorizontal="true" android:layout_width="wrap_content"android:layout_height="wrap_content"></ImageView><TextView android:layout_below="@id/item_image" android:id="@+id/item_name"android:layout_centerHorizontal="true" android:layout_width="wrap_content"android:layout_height="wrap_content" android:text="选项"></TextView></RelativeLayout>

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