Android ListView 长按如何获取item的主键并操作对应数据库元组

时间：2014-10-17 11:35:18 阅读：251 评论：0 收藏：0 [点我收藏+]

标签：android blog http color io os ar 使用 java

============问题描述============

我做的是一个租房管理系统，大概是现在在对房子操作这个界面，我现在是要长按listView中的某一个Item，要求实现修改和删除功能。

This is my house_setting.xml document

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:layout_gravity="center"
    android:id="@+id/ll_houseSetting"
    >
<Button
        android:id="@+id/buildingHouse"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textColor="#FFFFFF"
        android:textSize="25sp"
        android:background="#1C1C1C"
        android:gravity="center"
        android:text="添加新住房" />
<ListView
    android:id="@+id/houseSettingList"
    android:layout_width="match_parent"
     android:layout_height="match_parent"

    >

</ListView>
</LinearLayout>

This is my houseActivity.java document

package com.example.ren;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

import android.content.ContentUris;
import android.content.Context;

import java.util.List;

import db.RentingDB;
import db.houseSettingDB;
import entity.house;
import android.app.Activity;
import android.app.AlertDialog;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.text.TextUtils;
import android.util.Log;
import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.os.Build;
import android.content.Context;
import android.database.Cursor;
import android.graphics.Color;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class houseSettingActivity extends ActionBarActivity {
private ListView houseSettingList;
private List<house> houses;
private static final int ITEM_MODIFY = 1;
    private static final int ITEM_DELETE = 2;
    private houseSettingDB hDB;
    private MyAdapter adapter;
    private Cursor cursor;
    private SQLiteDatabase  db = null;
    private Context context;
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
Intent intent = new Intent(houseSettingActivity.this,
settingActivity.class);
startActivity(intent);
return true;
}
return super.onKeyDown(keyCode, event);
}

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.house_setting);
Button btnBuildingHouse = (Button) findViewById(R.id.buildingHouse);
btnBuildingHouse.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(houseSettingActivity.this,
houseBuildingActivity.class);
startActivity(intent);

}
});

hDB= new houseSettingDB(this);
houses = hDB.findAll();
ListView houseSettingList = (ListView) findViewById(R.id.houseSettingList);
adapter=new MyAdapter();
houseSettingList.setAdapter(adapter);
registerForContextMenu(houseSettingList);

}

private class MyAdapter extends BaseAdapter {

/**
* listview总数
*/
@Override
public int getCount() {
return houses.size();
}

@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return null;
}

@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return 0;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
TextView tv = new TextView(getApplicationContext());
tv.setTextSize(20);
tv.setTextColor(Color.BLUE);
house house = houses.get(position);
tv.setText(house.toString());
return tv;
}

}
  // 长按时显示的菜单
    @Override
    public void onCreateContextMenu(ContextMenu menu, View v,
            ContextMenuInfo menuInfo) {
        menu.setHeaderTitle("请选择操作");
        menu.add(0, ITEM_MODIFY, 0, "编辑");
        menu.add(0, ITEM_DELETE, 1, "删除");
    }
    public boolean onContextItemSelected(MenuItem item) {
        AdapterContextMenuInfo info = (AdapterContextMenuInfo) item
                .getMenuInfo();
        int index = (int)info.id;
     //  Object itemValue = adapter.getItem(info.position);
            switch (item.getItemId()) {
            case ITEM_MODIFY:
                break;
            case ITEM_DELETE:

             String[] str = {String.valueOf(index)};
             db= (new RentingDB (getApplicationContext())).getWritableDatabase();
                    db.delete("house","RecNo=?",str);
                    cursor.requery();

                break;
            default:
             return super.onContextItemSelected(item);
            }
             return true;
    }
}

I hope someone strong enough to solve my problem.If some problem on understanding my request , please make a comment on me . I will response as soon as possible

============解决方案1============

先从 houses 里删除掉那个数据,然后使用 adapter.notifyDataChanged 提示 Adapter 更新数据

Android ListView 长按如何获取item的主键并操作对应数据库元组

标签：android blog http color io os ar 使用 java

原文地址：http://www.cnblogs.com/qibileiru/p/4030478.html

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