package com.example.wang.tongxunlu;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.ContextMenu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;
import com.example.wang.tongxunlu.com.wang.tongxunlu.orm.TongXunLu;
import com.example.wang.tongxunlu.com.wang.tongxunlu.orm.TongXunLuDAO;
import java.util.ArrayList;
public class MainActivity
extends AppCompatActivity {
ListView lv_1;
//数据访问对象
TongXunLuDAO tongXunLuDAO=
new TongXunLuDAO(
this);
//数据集合
ArrayList<TongXunLu>
arrayList;
MyAdapter myAdapter;
int index;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv_1=
(ListView)findViewById(R.id.lv_1);
arrayList=
tongXunLuDAO.getAll();
myAdapter=
new MyAdapter();
lv_1.setAdapter(myAdapter);
lv_1.setOnCreateContextMenuListener(this);
}
//增加
public void bt_OnClick(View v)
{
final View view= View.inflate(
this, R.layout.tongxunlu_activity,
null);
AlertDialog alertDialog=
new AlertDialog.Builder(
this)
.setTitle("添加联系人信息"
)
.setView(view)
.setPositiveButton("保存",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
EditText et_name=
(EditText)view.findViewById(R.id.et_name);
EditText et_phone=
(EditText)view.findViewById(R.id.et_phone);
TongXunLu tongXunLu=
new TongXunLu(et_name.getText().toString(),
et_phone.getText().toString());
long l=
tongXunLuDAO.insert(tongXunLu);
if (l>0
)
{
Toast.makeText(MainActivity.this, "添加成功"
, Toast.LENGTH_SHORT).show();
}
else
{
Toast.makeText(MainActivity.this, "添加失败"
, Toast.LENGTH_SHORT).show();
}
arrayList.add(0
, tongXunLu);
myAdapter.notifyDataSetChanged();
}
})
.setNegativeButton("取消",
null)
.show();
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
menu.add(0, 1, 1, "修改"
);
menu.add(0,2,2,"删除"
);
AdapterView.AdapterContextMenuInfo m=
(AdapterView.AdapterContextMenuInfo)menuInfo;
index=
m.position;
}
@Override
public boolean onContextItemSelected(MenuItem item) {
Log.e("TAG","index="+
index);
switch (item.getItemId())
{
case 1
:
//修改
View view= View.inflate(
this, R.layout.tongxunlu_activity,
null);
final EditText et_name=
(EditText)view.findViewById(R.id.et_name);
et_name.setText(arrayList.get(index).getName());
final EditText et_phone=
(EditText)view.findViewById(R.id.et_phone);
et_phone.setText(arrayList.get(index).getPhone_number());
new AlertDialog.Builder(
this)
.setTitle("修改联系人信息"
)
.setView(view)
.setPositiveButton("修改",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
TongXunLu tongxunlu =
arrayList.get(index);
tongxunlu.setName(et_name.getText().toString());
tongxunlu.setPhone_number(et_phone.getText().toString());
if (tongXunLuDAO.updata(tongxunlu) > 0
) {
Toast.makeText(MainActivity.this, "修改成功"
, Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(MainActivity.this, "修改失败"
, Toast.LENGTH_SHORT).show();
}
//刷新列表
myAdapter.notifyDataSetChanged();
}
})
.setNegativeButton("取消",
null)
.show();
break;
case 2
:
//删除
new AlertDialog.Builder(
this)
.setTitle("确定要删除？"
)
.setPositiveButton("确定",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
//删除
if ( tongXunLuDAO.delete(arrayList.get(index).getId())>0
)
{
Toast.makeText(MainActivity.this, "删除成功"
, Toast.LENGTH_SHORT).show();
//更新List
arrayList.remove(index);
//刷新列表
myAdapter.notifyDataSetChanged();
}
else
{
Toast.makeText(MainActivity.this, "删除失败"
, Toast.LENGTH_SHORT).show();
}
}
})
.setNegativeButton("取消",
null)
.show();
break;
}
return super.onContextItemSelected(item);
}
class MyAdapter
extends BaseAdapter
{
@Override
public int getCount() {
return arrayList.size();
}
@Override
public Object getItem(
int position) {
return arrayList.get(position);
}
@Override
public long getItemId(
int position) {
return arrayList.get(position).getId();
}
@Override
public View getView(
int position, View convertView, ViewGroup parent) {
TongXunLu tongXunLu=
arrayList.get(position);
if (convertView==
null)
{
convertView=View.inflate(MainActivity.
this,R.layout.tongxunlu_activity,
null);
}
EditText editText=
(EditText)convertView.findViewById(R.id.et_name);
editText.setText(tongXunLu.getName());
EditText editText1=
(EditText)convertView.findViewById(R.id.et_phone);
editText1.setText(tongXunLu.getPhone_number());
return convertView;
}
}
}
MainActivity
package com.example.wang.tongxunlu.com.wang.tongxunlu.orm;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.util.Log;
import java.util.ArrayList;
//数据库操作类
public class TongXunLuDAO {
private DBHelper dh;
private final String TABLENAME="t_tongxunl"
;
public TongXunLuDAO(Context context)
{
// this.context=context;
dh=
new DBHelper(context);
}
//增
//传入参数:实体类的实例
public long insert(TongXunLu tongxunlu)
{
long rtn=0
;
//连接数据库
SQLiteDatabase sd=
dh.getWritableDatabase();
ContentValues cv=
new ContentValues();
cv.put("name"
,tongxunlu.getName());
cv.put("phone_number"
,tongxunlu.getPhone_number());
rtn=sd.insert(TABLENAME,
null,cv);
sd.close();
return rtn;
}
//删
public int delete(
long id)
{
int rtn=0
;
SQLiteDatabase sd=
dh.getWritableDatabase();
rtn=sd.delete(TABLENAME,"_id=?",
new String[]{id+""
});
sd.close();
return rtn;
}
//改
public int updata(TongXunLu tongxunlu)
{
int rtn=0
;
SQLiteDatabase sd=
dh.getWritableDatabase();
ContentValues cv=
new ContentValues();
cv.put("name"
,tongxunlu.getName());
cv.put("phone_number"
,tongxunlu.getPhone_number());
rtn=sd.update(TABLENAME,cv,"_id=?",
new String[]{tongxunlu.getId()+""
});
Log.e("TAG","rtn="+
rtn);
sd.close();
return rtn;
}
//查
//返回查询结果
public ArrayList<TongXunLu>
getAll()
{
ArrayList<TongXunLu> tongxunlus=
new ArrayList<>
();
//连接数据库
SQLiteDatabase sd=
dh.getWritableDatabase();
//查询之后得到游标结果集
Cursor cursor=sd.query(TABLENAME,
null,
null,
null,
null,
null, "_id desc"
);
//遍历结果集
while (cursor.moveToNext())
{
//1.把数据转成实体类的实例
TongXunLu bl=
new TongXunLu(cursor.getLong(0),cursor.getString(1),cursor.getString(2
));
tongxunlus.add(bl);
}
cursor.close();
sd.close();
return tongxunlus;
}
}
TongXunLuDAO
package com.example.wang.tongxunlu.com.wang.tongxunlu.orm;
public class TongXunLu {
private long id;
private String name;
private String phone_number;
public long getId() {
return id;
}
public void setId(
long id) {
this.id =
id;
}
public String getPhone_number() {
return phone_number;
}
public void setPhone_number(String phone_number) {
this.phone_number =
phone_number;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name =
name;
}
public TongXunLu(
long id, String name, String phone_number) {
this.id =
id;
this.phone_number =
phone_number;
this.name =
name;
}
public TongXunLu(String name, String phone_number) {
this.phone_number =
phone_number;
this.name =
name;
}
}
TongXunLu
package com.example.wang.tongxunlu.com.wang.tongxunlu.orm;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class DBHelper
extends SQLiteOpenHelper {
@Override
public void onCreate(SQLiteDatabase db) {
String sql= "CREATE TABLE t_tongxunl (_id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL," +
"name TEXT,phone_number INTEGER)"
;
db.execSQL(sql);
}
@Override
public void onUpgrade(SQLiteDatabase db,
int oldVersion,
int newVersion) {
}
public DBHelper(Context context) {
super(context, "TongXunl.db",
null, 1
);
}
}
DBHelper
<?xml version="1.0" encoding="utf-8"?>
<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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.wang.tongxunlu.MainActivity"
android:orientation="vertical">
<ListView
android:layout_width="match_parent"
android:layout_height="0dp"
android:id="@+id/lv_1"
android:layout_weight="1"></ListView>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="添加联系人"
android:id="@+id/bt_1"
android:onClick="bt_OnClick"/>
</LinearLayout>
activity_main
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="姓名:"
android:id="@+id/tv_name"/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/et_name"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="电话:"
android:id="@+id/tv_phone"/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/et_phone"/>
</LinearLayout>
</LinearLayout>
tongxunlu_activity
转载于:https://www.cnblogs.com/wangchuanqi/p/5576229.html
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