消息提醒，初探Notification

1：MainActivity.java

package com.example.notificationtest;

import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.NotificationCompat;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {
    private static  int NOTIFICATION_ID = 0;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        Button btnSendNotification = (Button)findViewById(R.id.btnSendNotification);
        
        btnSendNotification.setOnClickListener(btnOnClickListener());
    }
    
    OnClickListener btnOnClickListener(){
        return new OnClickListener(){

            @Override
            public void onClick(View arg0) {
                switch(arg0.getId()){
                case R.id.btnSendNotification:
                    Intent intent = new Intent(MainActivity.this, NotificationActivity.class);
                    String title = "消息标题";
                    intent.putExtra("title", title);
                    
                    PendingIntent pi = PendingIntent.getActivity(MainActivity.this, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT);
                    
                    NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
                    Notification n = new NotificationCompat.Builder(MainActivity.this)
                            .setSmallIcon(R.drawable.ic_launcher)
                            .setTicker("消息提示").setContentTitle(title)
                            .setContentText("消息子标题")
                            .setContentInfo("消息内容")
                            .setWhen(System.currentTimeMillis())        //显示当前时间
                            .setDefaults(Notification.DEFAULT_SOUND | Notification.DEFAULT_VIBRATE)    //使用默认的声音与震动
                            .setContentIntent(pi)
                            .setAutoCancel(true)
                            .build();

                    nm.notify(++NOTIFICATION_ID, n);
                    break;
                }
            }
        };
    }

}

2：activity_main.xml

<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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.notificationtest.MainActivity$PlaceholderFragment" >

    <Button
        android:id="@+id/btnSendNotification"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/send_notification" />
    
</RelativeLayout>

3：NotificationActivity.java

package com.example.notificationtest;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class NotificationActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        setContentView(R.layout.activity_notification);
        
        TextView tvInfo = (TextView)findViewById(R.id.tvInfo);
        tvInfo.setText(getIntent().getStringExtra("title"));
        
    }
}

4：activity_notification.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" 
    android:gravity="center">
    
    <TextView 
        android:id="@+id/tvInfo"
        android:textSize="22sp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Notificaiton Info"/>
</LinearLayout>