Android Studio 简易通讯录制作 （Java）
通讯录首页：
添加联系人页面：
修改联系人:
删除联系人：
程序代码：
MainActivity.java
package com.example.myapplication;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import androidx.appcompat.app.AlertDialog;
import android.content.DialogInterface;
import android.view.View;
import android.widget.AdapterView;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.Toast;
import java.util.List;
public class MainActivity extends AppCompatActivity{
private ImageView iv_add;
private ListView lv_show;
private EditText et_name,et_phone;
private MyAdapter myAdapter;
private DBHelper dbHelper;
private List userList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
iv_add = findViewById(R.id.iv_add);
lv_show = findViewById(R.id.lv_show);
if (userList != null) {
userList.clear();
}
dbHelper = new DBHelper(MainActivity.this, "user.db", null, 1);
updateListView();
iv_add.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
addData();
}
});
lv_show.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView parent, View view, int position, long id) {
updateData(position);
}
});
lv_show.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView parent, View view, int position, long id) {
deleteData(position);
return true;
}
});
}
private void addData() {
AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this);
View dialogView=View.inflate(MainActivity.this,R.layout.dialog,null);
builder.setIcon(R.drawable.icon)
.setTitle("添加联系人")
.setView(dialogView);
builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
et_name=dialogView.findViewById(R.id.et_name);
et_phone=dialogView.findViewById(R.id.et_pwd);
String name=et_name.getText().toString();
String phone=et_phone.getText().toString();
if (phone.length()!=11){
showToast("电话号码长度不符合要求");
}else {
User user=dbHelper.get(name);
if (user.getName()==null){
if (dbHelper.insert(name,phone)){
showToast("添加成功");
updateListView();
}else{
showToast("添加失败");
}
}else {
showToast("该联系人已存在");
}
}
}
})
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
AlertDialog alertDialog=builder.create();
alertDialog.show();
}
private void deleteData(int position) {
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setIcon(R.drawable.icon)
.setTitle("提示")
.setMessage("是否删除该联系人？")
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
User user = (User) myAdapter.getItem(position);
String deleteId = user.getId();
if (dbHelper.delete(deleteId)) {
updateListView();
showToast("删除成功");
} else {
showToast("删除失败");
}
}
})
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
AlertDialog alertDialog = builder.create();
alertDialog.show();
}
private void updateData(int position) {
View dialogView = View.inflate(MainActivity.this, R.layout.dialog, null);
User user = (User) myAdapter.getItem(position);
et_name = dialogView.findViewById(R.id.et_name);
et_phone = dialogView.findViewById(R.id.et_pwd);
et_name.setText(user.getName());
et_phone.setText(user.getPhone());
String findId = user.getId();
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setIcon(R.drawable.icon)
.setTitle("修改联系人")
.setView(dialogView)
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
String name = et_name.getText().toString();
String phone = et_phone.getText().toString();
if (phone.length()!=11){
showToast("电话号码长度不符合要求");
}else {
User user=dbHelper.get(name);
if (user.getName()==null){
if (dbHelper.update(findId,name,phone)){
showToast("修改成功");
updateListView();
}else{
showToast("修改失败");
}
}else {
showToast("该联系人已存在");
}
}
}
})
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
AlertDialog alertDialog = builder.create();
alertDialog.show();
}
public void updateListView(){
userList=dbHelper.query();
myAdapter=new MyAdapter(userList,MainActivity.this);
lv_show.setAdapter(myAdapter);
}
public void showToast(String msg){
Toast.makeText(MainActivity.this,msg,Toast.LENGTH_SHORT).show();
}
} MyAdapter.java
package com.example.myapplication;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import java.util.List;
public class MyAdapter extends BaseAdapter {
//使用list,list会存储数据库中note表所有记录。
private List list;
//用于将某个布局转换为view的对象。
private LayoutInflater layoutInflater;
//当创建MyAdapter对象的时候，需要list的数据
public MyAdapter(List list, Context context){
this.list=list;
layoutInflater=LayoutInflater.from(context);
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int position) {
return list.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder;
if (convertView==null){
convertView=layoutInflater.inflate(R.layout.item,null,false);
viewHolder=new ViewHolder(convertView);
convertView.setTag(viewHolder);
}else {
viewHolder=(ViewHolder)convertView.getTag();
}
//将数据库中的内容加载到对应的控件上
User user =(User) getItem(position);
viewHolder.tv_showName.setText(user.getName());
viewHolder.tv_showPhone.setText(user.getPhone());
return convertView;
}
//用于给item的视图加载数据内容。
class ViewHolder{
TextView tv_showName,tv_showPhone;
public ViewHolder(View view){
tv_showName=view.findViewById(R.id.tv_showName);
tv_showPhone=view.findViewById(R.id.tv_showPhone);
}
}
}
DBHelper.java
package com.example.myapplication;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import androidx.annotation.Nullable;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
public class DBHelper extends SQLiteOpenHelper {
private SQLiteDatabase db;
ContentValues contentValues = new ContentValues();
public DBHelper(@Nullable Context context, @Nullable String name, @Nullable SQLiteDatabase.CursorFactory factory, int version) {
super(context, name, factory, version);
db=this.getWritableDatabase();
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table user(id integer primary key autoincrement,name text,phone text)");
}
//添加数据
public boolean insert(String name,String phone) {
contentValues.put("name", name);
contentValues.put("phone", phone);
long result = db.insert("user", null, contentValues);
return result > 0 ? true : false;
}
public boolean delete(String id){
int result=db.delete("user","id=?",new String[]{id});
return result>0?true:false;
}
//修改数据，根据id进行修改
public boolean update(String id,String name,String phone){
contentValues.put("id",id);
contentValues.put("name",name);
contentValues.put("phone",phone);
int result=db.update("user",contentValues,"id=?",new String[]{id});
return result>0?true:false;
}
//查询数据,查询表中的所有内容，将查询的内容用note的对象属性进行存储，并将该对象存入集合中。
public List query(){
List list=new ArrayList<>();
Cursor result=db.query("user",null,null,null,
null,null,null,null);
if (result!=null){
while (result.moveToNext()) {
User user = new User();
user.setId(String.valueOf(result.getInt(0)));
user.setName(result.getString(1)); //1即第二列，指内容
user.setPhone(result.getString(2)); //2即第三列，指时间
list.add(user);
}result.close();
}return list;
}
public User get(String name) {
User user=new User();
Cursor result=db.query("user",null,"name=?",new String[]{name},
null,null,null,null);
if (result.getCount()==1){
result.moveToFirst();
user.setName(result.getString(1));
user.setPhone(result.getString(2));
return user;
}else {
user.setName(null);
user.setPhone(null);
return user;
}
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
} User.java
package com.example.myapplication;
public class User {
private String id;
private String name;
private String phone;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
activity_main.xml
dialog.xml
item.xml
colors.xml
#FFBB86FC
#FF6200EE
#FF3700B3
#FF03DAC5
#FF018786
#FF000000
#FFFFFFFF
#0B132B
#A49DBE
#D5CFE1
#E9E7EF
#D8C4C4
详细见：https://gitee.com/love1213/Android-Studio-Contacts.git