เริ่มต้นใช้งาน Android Notification

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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
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    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
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    android:paddingRight="@dimen/activity_horizontal_margin"
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    android:paddingTop="@dimen/activity_vertical_margin"
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    android:paddingBottom="@dimen/activity_vertical_margin"
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    tools:context=".MainActivity">
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    <Button
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        android:id="@+id/btn_notification"
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        android:layout_width="wrap_content"
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        android:layout_height="wrap_content"
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        android:layout_centerInParent="true"
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        android:text="Show Notification"
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        android:padding="32dp"
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        android:onClick="showNotification"/>
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</RelativeLayout>

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package com.devahoy.simplenotification;
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import android.support.v7.app.AppCompatActivity;
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import android.os.Bundle;
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import android.view.View;
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public class MainActivity extends AppCompatActivity {
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    @Override
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    protected void onCreate(Bundle savedInstanceState) {
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        super.onCreate(savedInstanceState);
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        setContentView(R.layout.activity_main);
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    }
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    public void showNotification(View view) {
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      // your code goes here.
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    }
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}

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Notification notification =
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        new NotificationCompat.Builder(this) // this is context
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                .setSmallIcon(R.mipmap.ic_launcher)
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                .setContentTitle("DevAhoy News")
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                .setContentText("สวัสดีครับ ยินดีต้อนรับเข้าสู่บทความ Android Notification :)")
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                .setAutoCancel(true)
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                .build();

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NotificationManager notificationManager =
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        (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
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notificationManager.notify(1000, notification);

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Intent intent = new Intent(Intent.ACTION_VIEW,
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        Uri.parse("https://devahoy.com"));
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PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);

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Notification notification =
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        new NotificationCompat.Builder(this) // this is context
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                .setSmallIcon(R.mipmap.ic_launcher)
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                .setContentTitle("DevAhoy News")
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                .setContentText("สวัสดีครับ ยินดีต้อนรับเข้าสู่บทความ Android Notification :)")
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                .setAutoCancel(true
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                .setContentIntent(pendingIntent)
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                .build();

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public void showNotification(View view) {
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    Intent intent = new Intent(Intent.ACTION_VIEW,
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            Uri.parse("https://devahoy.com/blog/2015/08/android-notification/"));
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    PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);
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    Notification notification =
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            new NotificationCompat.Builder(this)
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                    .setSmallIcon(R.mipmap.ic_launcher)
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                    .setContentTitle("DevAhoy News")
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                    .setContentText("สวัสดีครับ ยินดีต้อนรับเข้าสู่บทความ Android Notification :)")
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                    .setAutoCancel(true)
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                    .setContentIntent(pendingIntent)
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                    .build();
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    NotificationManager notificationManager =
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            (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
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    notificationManager.notify(1000, notification);
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}

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package com.devahoy.simplenotification;
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import android.os.Bundle;
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import android.support.v7.app.AppCompatActivity;
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public class PushActivity extends AppCompatActivity {
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    @Override
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    protected void onCreate(Bundle savedInstanceState) {
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        super.onCreate(savedInstanceState);
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        setContentView(R.layout.activity_push);
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    }
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}

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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
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    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
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    android:paddingRight="@dimen/activity_horizontal_margin"
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    android:paddingTop="@dimen/activity_vertical_margin"
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    android:paddingBottom="@dimen/activity_vertical_margin"
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    tools:context=".MainActivity">
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    <TextView
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        android:id="@+id/txt_message"
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        android:layout_width="wrap_content"
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        android:layout_height="wrap_content"
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        android:layout_centerInParent="true"/>
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</RelativeLayout>

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<application
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     android:allowBackup="true"
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     android:icon="@mipmap/ic_launcher"
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     android:label="@string/app_name"
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     android:theme="@style/AppTheme" >
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     <activity
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         android:name=".MainActivity"
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         android:label="@string/app_name" >
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         <intent-filter>
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             <action android:name="android.intent.action.MAIN" />
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             <category android:name="android.intent.category.LAUNCHER" />
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         </intent-filter>
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     </activity>
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     <activity
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         android:name=".PushActivity"
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         android:parentActivityName=".MainActivity">
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         <meta-data
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             android:name="android.support.PARENT_ACTIVITY"
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             android:value=".MainActivity"/>
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     </activity>
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 </application>

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// Uri.parse("https://devahoy.com/posts/android-notification/"));
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// PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);
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Intent intent = new Intent(this, PushActivity.class);
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intent.putExtra("message", MESSAGE);
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TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
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stackBuilder.addParentStack(PushActivity.class);
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stackBuilder.addNextIntent(intent);
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PendingIntent pendingIntent =
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        stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);

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private static final String TITLE = "Devahoy News";
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private static final String MESSAGE = "สวัสดีครับ ยินดีต้อนรับเข้าสู่บทความ Android Notification :)";

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package com.devahoy.simplenotification;
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import android.os.Bundle;
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import android.support.v7.app.AppCompatActivity;
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import android.widget.TextView;
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public class PushActivity extends AppCompatActivity {
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    @Override
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    protected void onCreate(Bundle savedInstanceState) {
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        super.onCreate(savedInstanceState);
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        setContentView(R.layout.activity_push);
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        Bundle bundle = getIntent().getExtras();
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        String message = bundle.getString("message");
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        TextView textView = (TextView) findViewById(R.id.txt_message);
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        textView.setText(message);
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    }
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}