Init demo source for Add, View and Delete from Database

DemoRealm/.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/workspace.xml
+/.idea/libraries
+.DS_Store
+/build
+/captures
+.externalNativeBuild

DemoRealm/app/.gitignore

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+/build

DemoRealm/app/build.gradle

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+apply plugin: 'com.android.application'
+apply plugin: 'realm-android'
+
+android {
+    compileSdkVersion 25
+    buildToolsVersion "25.0.0"
+    defaultConfig {
+        applicationId "com.example.seminar.demorealm"
+        minSdkVersion 15
+        targetSdkVersion 25
+        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-v7:25.0.0'
+    testCompile 'junit:junit:4.12'
+}

DemoRealm/app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in C:\Users\Lucifer\AppData\Local\Android\Sdk/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the proguardFiles
+# directive in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}

DemoRealm/app/src/androidTest/java/com/example/seminar/demorealm/ExampleInstrumentedTest.java

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+package com.example.seminar.demorealm;
+
+import android.content.Context;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumentation test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() throws Exception {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getTargetContext();
+
+        assertEquals("com.example.seminar.demorealm", appContext.getPackageName());
+    }
+}

DemoRealm/app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.seminar.demorealm">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme"
+        android:name=".BaseApplication">
+        <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>

DemoRealm/app/src/main/java/com/example/seminar/demorealm/BaseApplication.java

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+package com.example.seminar.demorealm;
+
+import android.app.Application;
+
+import io.realm.Realm;
+import io.realm.RealmConfiguration;
+
+
+public class BaseApplication extends Application {
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        Realm.init(this);
+        RealmConfiguration config = new RealmConfiguration.Builder().build();
+        Realm.setDefaultConfiguration(config);
+    }
+}

DemoRealm/app/src/main/java/com/example/seminar/demorealm/MainActivity.java

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+package com.example.seminar.demorealm;
+
+
+import android.support.v7.app.AppCompatActivity;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.View;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.TextView;
+
+import com.example.seminar.demorealm.Model.Person;
+
+import io.realm.Realm;
+import io.realm.RealmResults;
+
+
+public class MainActivity extends AppCompatActivity {
+
+    private EditText txtName, txtAge;
+    private Button btnAdd, btnView, btnDelete;
+    private TextView txtView;
+    private Realm realm;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+        realm = Realm.getDefaultInstance();
+
+        txtName = (EditText) findViewById(R.id.txtName);
+        txtAge = (EditText) findViewById(R.id.txtAge);
+        btnAdd = (Button) findViewById(R.id.btnAdd);
+        btnView = (Button) findViewById(R.id.btnView);
+        btnDelete = (Button) findViewById(R.id.btnDelete);
+        txtView = (TextView) findViewById(R.id.txtView);
+
+
+        btnAdd.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                save_to_database(txtName.getText().toString().trim(), Integer.parseInt(txtAge.getText().toString().trim()));
+            }
+        });
+
+        btnView.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                refresh_database();
+            }
+        });
+
+        btnDelete.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+
+                String Name = txtName.getText().toString();
+                delete_from_database(Name);
+            }
+        });
+
+
+    }
+
+    private void delete_from_database(String Name) {
+        final RealmResults<Person> persons = realm.where(Person.class).equalTo("Name", Name).findAll();
+        realm.executeTransaction(new Realm.Transaction() {
+            @Override
+            public void execute(Realm realm) {
+                persons.deleteFromRealm(0); // Delete and remove object directly
+            }
+        });
+    }
+
+    private void refresh_database() {
+        RealmResults<Person> result = realm.where(Person.class).findAllAsync();
+        result.load();
+        String output="";
+
+        for(Person person:result){
+            output+=person.toString();
+        }
+        txtView.setText(output);
+    }
+
+    private void save_to_database(final String Name, final int Age) {
+        realm.executeTransactionAsync(new Realm.Transaction() {
+            @Override
+            public void execute(Realm bgRealm) {
+                Person person = bgRealm.createObject(Person.class);
+                person.setName(Name);
+                person.setAge(Age);
+            }
+        }, new Realm.Transaction.OnSuccess() {
+            @Override
+            public void onSuccess() {
+                // Transaction was a success.
+                Log.v("Success", "---------->OK<--------------");
+            }
+        }, new Realm.Transaction.OnError() {
+            @Override
+            public void onError(Throwable error) {
+                // Transaction failed and was automatically canceled.
+                Log.e("Failed", error.getMessage());
+            }
+        });
+    }
+
+    @Override
+    protected void onDestroy() {
+        super.onDestroy();
+        realm.close();
+    }
+}