android的tabhost中查询按钮相关问题

Question

这是我的数据库代码：package com.example.SQLite;import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
public class Casequery extends SQLiteOpenHelper{     //数据库名称
private final static String NAME="modelpolice";
//数据库版本号
private final static int VERSION=1;
public Casequery(Context context, String name, CursorFactory factory,
int version) {
super(context, name, factory, version);
// TODO Auto-generated constructor stub
}
public Casequery(Context context,String name,int version) {
        this(context,name,null,version);
}
public Casequery(Context context,String name) {
        this(context,name,VERSION);
    }
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
 System.out.println("create database");
String sql="create table case(Id integer default'1'not null primary key autoincrement" +
",Time time not null,Reason varchar(50) not null,People varchar(20) not null" +
",Native varchar(50) not null,BegincaseTime time not null,EndcaseTime time not null," +
"FilingTime time not null" +
",Workpeople varchar(20) not null,Site varchar(50) not null)"; 
db.execSQL(sql);
} @Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
System.out.println("update database");
}}
这是选项卡：package com.example.tabwidget1;import android.app.TabActivity;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Color;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TabHost;
import android.widget.TabHost.OnTabChangeListener;
import android.widget.TextView;import com.example.SQLite.Casequery;public class CaseInquires extends TabActivity{
TabHost mTabHost;
public Button btn;
public Button btncx;
private TextView time;
private TextView people;
private TextView workpeople;
private TextView site;

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
//setContentView(R.layout.tabmain);
btn=(Button)findViewById(R.id.btn);
btncx=(Button)findViewById(R.id.btcx);
time = (TextView)findViewById(R.id.time);
people = (TextView)findViewById(R.id.people);
workpeople = (TextView)findViewById(R.id.workpeople);
site = (TextView)findViewById(R.id.site);
btn.setOnClickListener(new QueryListener());

mTabHost=getTabHost();
LayoutInflater.from(this).inflate(R.layout.tabmain, mTabHost.getTabContentView(), true);

mTabHost.addTab(mTabHost.newTabSpec("tab_test1").setIndicator("简单查询").setContent(R.id.tab1));
mTabHost.addTab(mTabHost.newTabSpec("Tab_test2").setIndicator("详细查询").setContent(R.id.tab2));

mTabHost.setBackgroundColor(Color.argb(150, 22, 70, 150));

mTabHost.setCurrentTab(0);



mTabHost.setOnTabChangedListener(new OnTabChangeListener(){ public void onTabChanged(String tabId) {
// TODO Auto-generated method stub }

});

}
class QueryListener implements OnClickListener{ @Override
public void onClick(View v) {
// TODO Auto-generated method stub

         }
    }
}
这是选项卡的布局文件：<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/tabhost"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <LinearLayout
        android:orientation="vertical"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">
        <TabWidget
            android:id="@android:id/tabs"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"/>
        <FrameLayout
            android:id="@android:id/tabcontent"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent">
            <RelativeLayout
                android:id="@+id/tab1"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent">
               <TextView
                   android:id="@+id/TVId"
                   android:text="请输入案件ID:"
                   android:layout_width="wrap_content"
                   android:layout_height="wrap_content"
                   android:layout_marginTop="100dp"
                   android:layout_marginLeft="100dp"
                   android:textSize="20sp"
                   />
               <EditText
                   android:id="@+id/ETId"
                   android:layout_centerInParent="true"
                   android:layout_width="200dp"
                   android:layout_height="wrap_content"
                   android:hint="请输入案件ID"
                   />
               <Button
                   android:id="@+id/btn"
                   android:layout_below="@id/ETId"
                   android:layout_width="150dp"
                   android:layout_height="wrap_content"
                   android:text="查      询"
                   android:layout_marginTop="30dp"
                   android:layout_centerHorizontal="true"
                   />
            </RelativeLayout>
            <RelativeLayout
                android:id="@+id/tab2"
                 android:layout_width="fill_parent"
                 android:layout_height="fill_parent">
               <TextView
                android:id="@+id/time"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="40dp"
                android:layout_marginTop="40dp"
                android:text="收案时间："/>"
                <EditText
                    android:id="@+id/ETSA"
                    android:layout_width="fill_parent"
                    android:layout_height="35dp"
                    android:layout_toRightOf="@id/time"
                    android:layout_marginTop="35dp"
                    android:layout_marginRight="10dp"
                    android:layout_marginLeft="10dp"
                    />
                <TextView
                android:id="@+id/people"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@id/time"
                android:layout_marginLeft="40dp"
                android:layout_marginTop="40dp"
                android:text="当  事  人："/>
                <EditText
                    android:id="@+id/ETXY"
                    android:layout_width="fill_parent"
                    android:layout_height="35dp"
                    android:layout_toRightOf="@id/time"
                    android:layout_marginTop="24dp"
                    android:layout_marginRight="10dp"
                    android:layout_marginLeft="10dp"
                    android:layout_below="@id/ETSA"
                    />
                <TextView
                android:id="@+id/workpeople"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@id/people"
                android:layout_marginLeft="40dp"
                android:layout_marginTop="40dp"
                android:text="执勤交警："/>
                <EditText
                    android:id="@+id/ETJJ"
                    android:layout_width="fill_parent"
                    android:layout_height="35dp"
                    android:layout_toRightOf="@id/workpeople"
                    android:layout_marginTop="24dp"
                    android:layout_marginRight="10dp"
                    android:layout_marginLeft="10dp"
                    android:layout_below="@id/ETXY"
                    />
                <TextView
                android:id="@+id/site"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@id/workpeople"
                android:layout_marginLeft="40dp"
                android:layout_marginTop="40dp"
                android:text="地        点："/>
                <EditText
                    android:id="@+id/ETDD"
                    android:layout_width="fill_parent"
                    android:layout_height="35dp"
                    android:layout_toRightOf="@id/site"
                    android:layout_marginTop="24dp"
                    android:layout_marginRight="10dp"
                    android:layout_marginLeft="10dp"
                    android:layout_below="@id/ETJJ"
                    />
                <Button
                    android:id="@+id/btcx"
                    android:layout_margin="60dp"
                    android:layout_centerHorizontal="true"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:layout_below="@id/ETDD"
                    android:text="查              询"
                    />
            </RelativeLayout>
         </FrameLayout>
        
    </LinearLayout>
    
</TabHost>我想在两个tab中都做查询按钮，在第一个tab中点查询后跳到一个显示详细信息的界面，第二个tab中不一定都写，然后点查询，跳到listview显示界面，然后点listview任何一个数据就会跳到详细信息的界面。目前的状况是程序不能运行，把btn的监听器去掉就能运行，但不知道后面该怎么写。