Android個(gè)人手機(jī)通訊錄開(kāi)發(fā)詳解

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.example.alan.directory" >

 <application
  android:allowBackup="true"
  android:icon="@drawable/icon_phone"
  android:label="@string/app_name"
  android:supportsRtl="true"
  android:theme="@style/AppTheme" >
  <activity android:name=".MainActivity" >
   <intent-filter>
    <action android:name="android.intent.action.MAIN" />

    <category android:name="android.intent.category.LAUNCHER" />
   </intent-filter>
  </activity>
 </application>

</manifest>

/**
 * Created by Alan J on 13/2/2019.
 */

package com.example.alan.directory;

import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.method.ScrollingMovementMethod;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

 MyHelper myHelper;
 private EditText etName;
 private EditText etPhone;
 private TextView tvShow;
 private Button btnAdd;
 private Button btnQuery;
 private Button btnUpdate;
 private Button btnDelete;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  myHelper = new MyHelper(this);
  init(); //初始化控件
 }
 private void init(){
  etName = (EditText)findViewById(R.id.et_name);
  etPhone = (EditText)findViewById(R.id.et_phone);
  tvShow = (TextView)findViewById(R.id.tv_show);
  btnAdd = (Button)findViewById(R.id.btn_add);
  btnQuery = (Button)findViewById(R.id.btn_query);
  btnUpdate = (Button)findViewById(R.id.btn_update);
  btnDelete = (Button)findViewById(R.id.btn_delete);
  btnAdd.setOnClickListener(this);   //Button控件設(shè)置監(jiān)聽(tīng)
  btnQuery.setOnClickListener(this);
  btnUpdate.setOnClickListener(this);
  btnDelete.setOnClickListener(this);
  tvShow.setMovementMethod(ScrollingMovementMethod.getInstance()); //設(shè)置文本滾動(dòng)
 }
 @Override
 public void onClick(View v){
  String name;
  String phone;
  SQLiteDatabase db;
  switch (v.getId()){
   case R.id.btn_add:  //添加聯(lián)系人
    name = etName.getText().toString().trim();
    phone = etPhone.getText().toString().trim();
    db = myHelper.getWritableDatabase();
    if (name.equals("") || phone.equals("")){ //聯(lián)系人信息不能為空
     Toast.makeText(this,"聯(lián)系人信息添加失敗",Toast.LENGTH_SHORT).show();
    }
    else {
     db.execSQL("insert into person (name,phone) values(?,?)", new Object[]{name, phone});
     Toast.makeText(this,"聯(lián)系人信息添加成功",Toast.LENGTH_SHORT).show();
    }
    db.close();
    break;
   case R.id.btn_query: //查詢聯(lián)系人
    db = myHelper.getReadableDatabase();
    Cursor cursor = db.rawQuery("select name,phone from person",null);
    if (cursor.getCount() == 0){
     tvShow.setText("");
     Toast.makeText(this,"空目錄",Toast.LENGTH_SHORT).show();
    }else {
     cursor.moveToFirst();
     tvShow.setText("Name：" + cursor.getString(0) + " ; Tel：" + cursor.getString(1));
     while (cursor.moveToNext()){
      tvShow.append("\n" + "Name：" + cursor.getString(0) + " ; Tel：" + cursor.getString(1));
     }
    }
    cursor.close();
    db.close();
    break;
   case R.id.btn_update: //修改聯(lián)系人
    db = myHelper.getWritableDatabase();
    name = etName.getText().toString().trim();
    phone = etPhone.getText().toString().trim();
    if (name.equals("") || phone.equals("")){ //聯(lián)系人信息不能為空
     Toast.makeText(this,"聯(lián)系人信息修改失敗",Toast.LENGTH_SHORT).show();
    }
    else {
     db.execSQL("update person set name=?,phone=? where name=?", new Object[]{name, phone, name});
     Toast.makeText(this,"聯(lián)系人信息修改成功",Toast.LENGTH_SHORT).show();
    }
    db.close();
    break;
   case R.id.btn_delete: //刪除聯(lián)系人
    db = myHelper.getWritableDatabase();
    name = etName.getText().toString().trim();
    phone = etPhone.getText().toString().trim();
    if (name.equals("") || phone.equals("")){ //聯(lián)系人信息不能為空
     Toast.makeText(this,"聯(lián)系人信息刪除失敗",Toast.LENGTH_SHORT).show();
    }
    else {
     db.execSQL("delete from person where name=? and phone=?", new Object[]{name, phone});
     Toast.makeText(this,"聯(lián)系人信息刪除成功",Toast.LENGTH_SHORT).show();
    }
    db.close();
    break;
  }
 }
}

/**
 * Created by Alan J on 13/2/2019.
 */

package com.example.alan.directory;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;


public class MyHelper extends SQLiteOpenHelper{


 public MyHelper(Context context){
  super(context, "alan.db", null ,2);
 }
 @Override

 public void onCreate(SQLiteDatabase db){
  db.execSQL("create table person(id integer primary key autoincrement,name varchar(20),phone varchar(20) unique)");
 }
 public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion){

 }
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:background="@drawable/background"
 tools:context=".MainActivity">
 <LinearLayout
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:id="@+id/lineOne">
  <ImageView
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:background="@drawable/head"
   android:layout_margin="30dp"/>
  <TextView
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="通 訊 錄"
   android:textSize="30dp"
   android:textStyle="bold"
   android:textColor="#BC8F8F"
   android:layout_gravity="center"
   android:layout_marginLeft="50dp"
   />
 </LinearLayout>
 <LinearLayout
  android:id="@+id/lineTwo"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:layout_below="@+id/lineOne"
  android:layout_marginTop="20dp"
  android:layout_marginLeft="18dp"
  android:layout_marginRight="18dp">
  <TextView
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="姓 名 : "
   android:textSize="18dp"
   android:textStyle="bold"/>
  <EditText
   android:id="@+id/et_name"
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:hint="  請(qǐng)輸入姓名"
   android:textSize="16dp"
   android:maxLength="14"/>
 </LinearLayout>
 <LinearLayout
  android:id="@+id/lineTree"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:layout_below="@+id/lineTwo"
  android:layout_marginTop="10dp"
  android:layout_marginLeft="18dp"
  android:layout_marginRight="18dp">
  <TextView
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="電 話 : "
   android:textSize="18dp"
   android:textStyle="bold"/>
  <EditText
   android:id="@+id/et_phone"
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:hint="  請(qǐng)輸入手機(jī)號(hào)碼"
   android:textSize="16dp"
   android:maxLength="11"/>
 </LinearLayout>
 <LinearLayout
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:id="@+id/lineFour"
  android:layout_below="@+id/lineTree"
  android:layout_marginTop="30dp"
  android:layout_marginLeft="18dp"
  android:layout_marginRight="18dp"
  android:orientation="horizontal">
  <Button
   android:id="@+id/btn_add"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:background="@drawable/shape"
   android:layout_weight="1"
   android:text=" 添 加 "
   android:textSize="16dp"
   android:textColor="#c2c8ec"
   android:textStyle="bold"/>
  <Button
   android:id="@+id/btn_query"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:background="@drawable/shape"
   android:layout_weight="1"
   android:layout_marginLeft="4dp"
   android:text=" 查 詢 "
   android:textSize="16dp"
   android:textColor="#c2c8ec"
   android:textStyle="bold"/>
  <Button
   android:id="@+id/btn_update"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:background="@drawable/shape"
   android:layout_weight="1"
   android:layout_marginLeft="4dp"
   android:text=" 修 改 "
   android:textSize="16dp"
   android:textColor="#c2c8ec"
   android:textStyle="bold"/>
  <Button
   android:id="@+id/btn_delete"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:background="@drawable/shape"
   android:layout_weight="1"
   android:layout_marginLeft="4dp"
   android:text=" 刪 除 "
   android:textSize="16dp"
   android:textColor="#c2c8ec"
   android:textStyle="bold"/>
 </LinearLayout>
 <TextView
  android:id="@+id/tv_show"
  android:layout_width="match_parent"
  android:layout_height="180dp"
  android:scrollbars="vertical"
  android:layout_below="@+id/lineFour"
  android:layout_marginTop="20dp"
  android:layout_marginLeft="20dp"
  android:layout_marginRight="18dp"
  android:textSize="20dp"/>
</RelativeLayout>

<?xml version="1.0" encoding="utf-8" ?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
 android:shape="rectangle">

 <!--設(shè)置背景色-->
 <solid android:color="#BC8F8F" />

 <!--設(shè)置圓角-->
 <corners android:radius="105dip" />

 <!--設(shè)置邊框線的寬度和顏色-->
 <stroke android:width="0dp" android:color="#B0C4DE" />
</shape>

//聯(lián)系人電話號(hào)碼唯一性

@Override

public void onCreate(SQLiteDatabase db){
  db.execSQL("create table person(id integer primary key autoincrement,name varchar(20),phone varchar(20) unique)");
}


//電話號(hào)碼長(zhǎng)度限制

<EditText
 android:id="@+id/et_phone"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:hint="  請(qǐng)輸入手機(jī)號(hào)碼"
 android:textSize="16dp"
 android:maxLength="11"/>


//聯(lián)系人信息為空時(shí)的限制

　　　　　　　　case R.id.btn_add:  //添加聯(lián)系人
    name = etName.getText().toString().trim();
    phone = etPhone.getText().toString().trim();
    db = myHelper.getWritableDatabase();
    if (name.equals("") || phone.equals("")){ //聯(lián)系人信息不能為空
     Toast.makeText(this,"聯(lián)系人信息添加失敗",Toast.LENGTH_SHORT).show();
    }
    else {
     db.execSQL("insert into person (name,phone) values(?,?)", new Object[]{name, phone});
     Toast.makeText(this,"聯(lián)系人信息添加成功",Toast.LENGTH_SHORT).show();
    }
    db.close();
    break;

//查詢聯(lián)系人

　　　　　　case R.id.btn_query: 
    db = myHelper.getReadableDatabase();
    Cursor cursor = db.rawQuery("select name,phone from person",null);
    if (cursor.getCount() == 0){
     tvShow.setText("");
     Toast.makeText(this,"空目錄",Toast.LENGTH_SHORT).show();
    }else {
     cursor.moveToFirst();
     tvShow.setText("Name：" + cursor.getString(0) + " ; Tel：" + cursor.getString(1));
     while (cursor.moveToNext()){
      tvShow.append("\n" + "Name：" + cursor.getString(0) + " ; Tel：" + cursor.getString(1));
     }
    }
    cursor.close();
    db.close();
    break;

//修改聯(lián)系人

　　　　　　case R.id.btn_update: 
    db = myHelper.getWritableDatabase();
    name = etName.getText().toString().trim();
    phone = etPhone.getText().toString().trim();
    if (name.equals("") || phone.equals("")){ //聯(lián)系人信息不能為空
     Toast.makeText(this,"聯(lián)系人信息修改失敗",Toast.LENGTH_SHORT).show();
    }
    else {
     db.execSQL("update person set name=?,phone=? where name=?", new Object[]{name, phone, name});
     Toast.makeText(this,"聯(lián)系人信息修改成功",Toast.LENGTH_SHORT).show();
    }
    db.close();
    break;

　　　　　　　　　if (name.equals("") || phone.equals("")){ //聯(lián)系人信息不能為空
     Toast.makeText(this,"聯(lián)系人信息修改失敗",Toast.LENGTH_SHORT).show();
    }
    else {
     db.execSQL("update person set name=?,phone=? where name=?", new Object[]{name, phone, name});
     Toast.makeText(this,"聯(lián)系人信息修改成功",Toast.LENGTH_SHORT).show();
    }

//刪除聯(lián)系人

　　　　　　　case R.id.btn_delete: 
    db = myHelper.getWritableDatabase();
    name = etName.getText().toString().trim();
    phone = etPhone.getText().toString().trim();
    if (name.equals("") || phone.equals("")){ //聯(lián)系人信息不能為空
     Toast.makeText(this,"聯(lián)系人信息刪除失敗",Toast.LENGTH_SHORT).show();
    }
    else {
     db.execSQL("delete from person where name=? and phone=?", new Object[]{name, phone});
     Toast.makeText(this,"聯(lián)系人信息刪除成功",Toast.LENGTH_SHORT).show();
    }
    db.close();
    break;

　　　　　　　　　if (name.equals("") || phone.equals("")){ //聯(lián)系人信息不能為空
     Toast.makeText(this,"聯(lián)系人信息刪除失敗",Toast.LENGTH_SHORT).show();
    }
    else {
     db.execSQL("delete from person where name=? and phone=?", new Object[]{name, phone});
     Toast.makeText(this,"聯(lián)系人信息刪除成功",Toast.LENGTH_SHORT).show();
    }