安卓ViewPager中Button点击事件弹出Dialog

首先页面采用ViewPager，在第一个页面中有一个按钮，要求点击这个页面上的按钮弹出一个对话框。

先贴出效果图：

分析难点：1、在ViewPager中，共有四个选项卡页，找到第一个页面中Button按钮。先贴出代码：

package com.example.acountrecorder;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import com.example.adapter.MyPagerAdapter;
import com.example.entity.DishesMenu;
import com.example.service.MenuService;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ListView;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.SimpleAdapter;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.Toast;

public class MainActivity extends Activity {
    
    private Button btnMoney,adddish;
    private RadioButton dishes,choosedishbyhand,choosedishrandom,payrecorder;
    private RadioGroup radioGroup;
    private ListView listView;
    private SimpleAdapter simpleAdapter;
    private ViewPager vpager;
    private int currIndex=0;
    private ArrayList<View> listViews;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        init();
        InitViewPager();
        doSthRelative();
        setAction();
    }

    private void setAction() {
        if (currIndex==0) {
            //下面两句诗关键！！！！
            View view1 = listViews.get(currIndex);
            adddish = (Button) view1.findViewById(R.id.adddish);
            adddish.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    LayoutInflater inflater = getLayoutInflater();
                    View layout = inflater.inflate(R.layout.dialog_adddish,
                         (ViewGroup) findViewById(R.id.dialog_dish));
                       
                    new AlertDialog.Builder(MainActivity.this).setTitle("").setView(layout).setPositiveButton("确定",
                            new DialogInterface.OnClickListener() {
                                @Override
                                public void onClick(DialogInterface dialog, int which) {
                                    // TODO Auto-generated method stub
                                    Toast.makeText(MainActivity.this, "dialog弹出来的", Toast.LENGTH_SHORT).show();
                                }
                            }
                        
                    ).setNegativeButton("取消", null).show();   
                }
                
            });
        }
        
    }

    private void init() {
        btnMoney = (Button) findViewById(R.id.btn_money);
        radioGroup = (RadioGroup) findViewById(R.id.radiogroup_item);
        dishes = (RadioButton) findViewById(R.id.disheschoice);
        choosedishbyhand = (RadioButton) findViewById(R.id.choosedishbyhand); 
        choosedishrandom = (RadioButton) findViewById(R.id.choosedishrandom);
        payrecorder = (RadioButton) findViewById(R.id.paymentrecord);
        //listView = (ListView) findViewById(R.id.checkdishes);
        radioGroup.setOnCheckedChangeListener(rdgcc);
        vpager = (ViewPager) findViewById(R.id.vPager);
    }

    private RadioGroup.OnCheckedChangeListener rdgcc = new OnCheckedChangeListener() {
             
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                int r1 = dishes.getId(),r2 = choosedishbyhand.getId(),r3 = choosedishrandom.getId(),r4 = payrecorder.getId();
                if (r1==checkedId) {
                    Toast.makeText(MainActivity.this, dishes.getText().toString(), Toast.LENGTH_SHORT).show();
                    currIndex = 0;
                    vpager.setCurrentItem(currIndex);//加载完页面后再加载页面上的元素
                    //adddish = (Button) findViewById(R.id.adddish);
                }else if (r2==checkedId) {
                    Toast.makeText(MainActivity.this, choosedishbyhand.getText().toString(), Toast.LENGTH_SHORT).show();
                    currIndex = 1;
                    vpager.setCurrentItem(currIndex);
                }else if (r3==checkedId) {
                    Toast.makeText(MainActivity.this, choosedishrandom.getText().toString(), Toast.LENGTH_SHORT).show();
                    currIndex = 2;
                    vpager.setCurrentItem(currIndex);
                }else if (r4==checkedId) {
                    Toast.makeText(MainActivity.this, payrecorder.getText().toString(), Toast.LENGTH_SHORT).show();
                    currIndex = 3;
                    vpager.setCurrentItem(currIndex);
                }    
            }
        };

        private void InitViewPager() {
            vpager = (ViewPager) findViewById(R.id.vPager);
            listViews = new ArrayList<View>();
            LayoutInflater mInflater = getLayoutInflater();
            listViews.add(mInflater.inflate(R.layout.mydishes, null));
            listViews.add(mInflater.inflate(R.layout.chosdishhandly, null));
            listViews.add(mInflater.inflate(R.layout.chosdishrandom, null));
            listViews.add(mInflater.inflate(R.layout.recorders, null));
            vpager.setAdapter(new MyPagerAdapter(listViews));
            vpager.setCurrentItem(0);
            vpager.setOnPageChangeListener(new OnPageChangeListener() {
                @Override
                public void onPageSelected(int arg0) {
                    switch (arg0) {
                    case 0:
                        dishes.setChecked(true);
                        break;
                    case 1:
                        choosedishbyhand.setChecked(true);
                        break;
                    case 2:
                        choosedishrandom.setChecked(true);
                        break;
                    case 3:
                        payrecorder.setChecked(true);
                        break;
                        
                    default:
                        break;
                    }
                }
                @Override
                public void onPageScrolled(int arg0, float arg1, int arg2) {
                }
                @Override
                public void onPageScrollStateChanged(int arg0) {
                }
            });
        }    
    private void doSthRelative(){
        if (currIndex==0) {
            //首先查询数据库中是否有数据，有数据则加载数据
            listView = (ListView)findViewById(R.id.allmydishes);
            ArrayList<HashMap<String, Object>> listMap = new ArrayList<HashMap<String, Object>>();
            DishesMenu dish = new DishesMenu();
            MenuService menuService = new MenuService(MainActivity.this);
            List<DishesMenu> listMenu = menuService.queryAll();
            if (listMenu!=null) {
                for (int i = 0; i < listMenu.size(); i++) {
                     dish = listMenu.get(i);
                     HashMap<String, Object> map = new HashMap<String, Object>();
                     map.put("dishname", dish.getDishname());
                     map.put("dishprice", dish.getDishprice());
                     listMap.add(map);
                }
                simpleAdapter = new SimpleAdapter(this,listMap, R.layout.checkdisheslistviewitem, new String[]{"dishname","dishprice"}, new int[]{R.id.display_dishname,R.id.display_dishprice});
                listView.setAdapter(simpleAdapter);
            }
            
        }
        
    }    
    @Override
    public 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;
    }

}

其次是activitymain.xml代码：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="#FFFFFFFF" >

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="50dip"
        android:background="#FF333333" >
        <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerInParent="true"
                android:text="@string/title"
                android:textColor="#FFFFFFFF"
                android:textSize="20sp" />
        <Button
                android:layout_width="40dip"
                android:layout_height="40dip"
                android:id="@+id/btn_money"
                android:layout_centerInParent="true"
                android:layout_alignParentRight="true"
                android:layout_marginRight="20dip"
                android:background="@drawable/moneypackage" />
    </RelativeLayout>
    
        <RadioGroup 
            android:id="@+id/radiogroup_item"
            android:layout_width="wrap_content"
            android:layout_height="40dip"
            android:orientation="horizontal">
            <RadioButton android:id="@+id/disheschoice"
                android:layout_width="wrap_content"
                android:layout_height="40dip"
                android:layout_weight="1"
                android:background="@drawable/rb_bg"
                android:button="@null"
                android:checked="true"
                android:gravity="center"
                android:text="@string/dishestochoose"
                android:textColor="#FFFFFFFF"
                android:textSize="18sp"
                android:textStyle="bold"
                />
            <RadioButton android:id="@+id/choosedishbyhand"
                android:layout_width="wrap_content"
                android:layout_height="40dip"
                android:layout_weight="1"
                android:background="@drawable/rb_bg"
                android:button="@null"
                android:checked="false"
                android:gravity="center"
                android:text="@string/choosedishbyhand"
                android:textColor="#FFFFFFFF"
                android:textSize="18sp"
                android:textStyle="bold"
                />
             <RadioButton android:id="@+id/choosedishrandom"
                android:layout_width="wrap_content"
                android:layout_height="40dip"
                android:layout_weight="1"
                android:background="@drawable/rb_bg"
                android:button="@null"
                android:checked="false"
                android:gravity="center"
                android:text="@string/choosedishrandom"
                android:textColor="#FFFFFFFF"
                android:textSize="18sp"
                android:textStyle="bold"
                />
             <RadioButton android:id="@+id/paymentrecord"
                android:layout_width="wrap_content"
                android:layout_height="40dip"
                android:layout_weight="1"
                android:background="@drawable/rb_bg"
                android:button="@null"
                android:checked="false"
                android:gravity="center"
                android:text="@string/paymentrecord"
                android:textColor="#FFFFFFFF"
                android:textSize="18sp"
                android:textStyle="bold"
                />   
        </RadioGroup>
        <android.support.v4.view.ViewPager
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/vPager"
            android:layout_gravity="center"
            android:background="#000000"
            android:flipInterval="30"
            android:persistentDrawingCache="animation"
            />
        
</LinearLayout>

第一个选项卡页面：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="#FFFF1565"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >
    
        
        <ListView 
            android:layout_width="match_parent"
            android:layout_height="340dip"
            android:id="@+id/allmydishes"
            android:layout_marginTop="10dip"
            >
            
        </ListView>
        <Button 
            android:layout_width="50dip"
            android:layout_height="50dip"
            android:background="@drawable/btn_add"
            android:gravity="bottom"
            android:id="@+id/adddish"
            android:layout_marginTop="20dip"
            android:layout_marginLeft="40dip"
            />
</LinearLayout>

还有dialog.xml页面：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:id="@+id/dialog_dish"
    android:background="#00000000" >
    
    <LinearLayout 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dip"
        android:orientation="horizontal">
        <TextView 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/diahname"
            android:textColor="#FFFFFFFF"
            android:textSize="16sp">
        </TextView>
        <EditText 
            android:layout_width="200dip"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dip"
            android:inputType="text"
            android:textSize="16sp"
            android:id="@+id/dish_addnewname"/>
    </LinearLayout>    
    <LinearLayout 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dip"
        android:orientation="horizontal">
        <TextView 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/diahprice"
            android:textColor="#FFFFFFFF"
            android:textSize="16sp">
        </TextView>
        <EditText 
            android:layout_width="200dip"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dip"
            android:inputType="text"
            android:textSize="16sp"
            android:id="@+id/dish_addnewprice"/>
    </LinearLayout>   
</LinearLayout>

难点分析：2、AlertDialog的用法，详细查看AndroidAPI。