Android library Realm 資料庫

簡單的Realm資料庫CRUD應用

1.build.gradle(Project:xxxx)加入classpath "io.realm:realm-gradle-plugin:2.2.1"

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.2.3'
        classpath "io.realm:realm-gradle-plugin:2.2.1"
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

2.build.gradle(Module:app)加入apply plugin: 'realm-android'

apply plugin: 'com.android.application'
apply plugin: 'realm-android'

android {
    compileSdkVersion 24
    buildToolsVersion "24.0.1"
    defaultConfig {
        applicationId "com.terryyamg.realmtest"
        minSdkVersion 19
        targetSdkVersion 24
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:24.2.1'
    compile 'com.android.support:design:24.2.1'
    testCompile 'junit:junit:4.12'
}

3.AndroidManifest.xml的application內加入android:name=".MyApplication"

4.MyApplication.java

package com.terryyamg.realmtest;
import android.app.Application;
import io.realm.Realm;
public class MyApplication extends Application {

    @Override
    public void onCreate() {
        super.onCreate();
        // Initialize Realm. Should only be done once when the application starts.
        Realm.init(this);

    }
}

5.MainActivity.java

package com.terryyamg.realmtest;

import android.app.Dialog;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import io.realm.Realm;
import io.realm.RealmResults;

public class MainActivity extends AppCompatActivity {

    private Realm realm;
    TextView tvMessage;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        realm = Realm.getDefaultInstance();

        tvMessage = (TextView) findViewById(R.id.tvMessage);

        //Create
        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                create();
            }
        });
        //Update
        FloatingActionButton fabUpdate = (FloatingActionButton) findViewById(R.id.fabUpdate);
        fabUpdate.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                update();
            }
        });
        //Delete
        FloatingActionButton fabDelete = (FloatingActionButton) findViewById(R.id.fabDelete);
        fabDelete.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                delete();
            }
        });

        read();
    }

    private void create() {
        final Dialog dialog = new Dialog(MainActivity.this);
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
        dialog.setContentView(R.layout.table_dialog);
        final EditText etName = (EditText) dialog.findViewById(R.id.etName);
        final EditText etAge = (EditText) dialog.findViewById(R.id.etAge);
        Button btnSave = (Button) dialog.findViewById(R.id.btnSave);
        btnSave.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                realm.executeTransaction(new Realm.Transaction() {
                    @Override
                    public void execute(Realm realm) {
                        int personCount;
                        //PrimaryKey增加
                        try {
                            personCount = realm.where(Person.class).max("id").intValue() + 1;
                        } catch (Exception e) {
                            personCount = 1; //從1開始
                        }
                        Log.i("personCount", personCount + "");
                        // 人 Table
                        Person personC = realm.createObject(Person.class, personCount);
                        personC.setName(etName.getText().toString());   // 輸入姓名
                        personC.setAge(Integer.parseInt(etAge.getText().toString()));   //輸入年齡

                        /* 公司 Table 測試 */
//                        Company company1 = realm.createObject(Company.class);
//                        company1.setId(4);
//                        company1.setCompanyName("公司2");
//                        personC.getCompany().add(company1);
//
//                        Company company2 = realm.createObject(Company.class);
//                        company2.setId(5);
//                        company2.setCompanyName("公司3");
//                        personC.getCompany().add(company2);
//
//                        Company company3 = realm.createObject(Company.class);
//                        company3.setId(6);
//                        company3.setCompanyName("公司4");
//                        personC.getCompany().add(company3);

                        read();
                        dialog.dismiss();
                    }
                });
            }
        });

        dialog.show();
    }

    private void read() {
        /* 公司 Table 測試 */
//        RealmResults<Person> person = realm.where(Person.class).equalTo("company.companyName", "公司2").equalTo("company.companyName", "公司1").findAll();
        RealmResults<Person> person = realm.where(Person.class).findAll();
        String message = "";
        Log.i("person.size()",person.size()+"");
        for (int i = 0; i < person.size(); i++) {
            message += person.get(i).getName() + " - " + person.get(i).getAge() + "\n";
            /* 公司 Table 測試 */
//            Log.i("getCompany.size()",person.get(i).getCompany().size()+"");
//            for(int j = 0; j <person.get(i).getCompany().size();j++) {
//                message += person.get(i).getName() + " - " + person.get(i).getAge() + ":" + person.get(i).getCompany().get(j).getCompanyName() + "\n";
//            }
        }
        tvMessage.setText(message);
    }

    private void update() {
        final Dialog dialog = new Dialog(MainActivity.this);
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
        dialog.setContentView(R.layout.table_dialog);
        final EditText etName = (EditText) dialog.findViewById(R.id.etName);
        final EditText etAge = (EditText) dialog.findViewById(R.id.etAge);
        Button btnSave = (Button) dialog.findViewById(R.id.btnSave);
        btnSave.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                realm.executeTransaction(new Realm.Transaction() {
                    @Override
                    public void execute(Realm realm) {
                        //修改第一筆
                        Person person = realm.where(Person.class).equalTo("id", 1).findFirst();
                        person.setName(etName.getText().toString());
                        person.setAge(Integer.parseInt(etAge.getText().toString()));

                        read();
                        dialog.dismiss();
                    }
                });
            }
        });

        dialog.show();
    }

    private void delete() {
        final RealmResults<Person> results = realm.where(Person.class).findAll();
        realm.executeTransaction(new Realm.Transaction() {
            @Override
            public void execute(Realm realm) {
                //刪除某一筆
//                Person p = results.get(1);
//                p.deleteFromRealm();
                //刪除第一筆
//                results.deleteFirstFromRealm();
                //刪除最後一筆
//                results.deleteLastFromRealm();
                //刪除全部
                results.deleteAllFromRealm();
            }
        });
        read();
    }

}

6.Person.java

package com.terryyamg.realmtest;


import io.realm.RealmList;
import io.realm.RealmObject;
import io.realm.annotations.PrimaryKey;

public class Person extends RealmObject{

    @PrimaryKey
    private int id;

    private String name;
    private int age;
    private RealmList<Company> company;

    public void setId(int id){
        this.id = id;
    }

    public int getId(){
        return id;
    }

    public void setName(String name){
        this.name = name;
    }

    public String getName(){
        return name;
    }

    public void setAge(int age){
        this.age = age;
    }

    public int getAge(){
        return age;
    }

    public void setCompany(RealmList<Company> company){
        this.company = company;
    }

    public RealmList<Company> getCompany(){
        return company;
    }

}

7.Company.java

package com.terryyamg.realmtest;


import io.realm.RealmObject;

public class Company extends RealmObject{

    private int id;

    private String companyName;

    public void setId(int id){
        this.id = id;
    }

    public int getId(){
        return id;
    }

    public void setCompanyName(String companyName){
        this.companyName = companyName;
    }

    public String getCompanyName(){
        return companyName;
    }

}

8./res/layout/activity_main.xml

9./res/layout/content_main.xml

10./res/layout/table_dialog.xml

參考資料:
https://realm.io/docs/java/latest/#getting-started
檔案下載:
https://github.com/terryyamg/RealmTest