Notification 簡介

這個例子是在工具列中出現一個提示字(Notification)

首先介面的部分 ，選用LinearLayout，包含2個Button，一個來產生通知，另外一個來清除通知，XML 如下
<LinearLayout 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"  
    tools:context=".MainActivity" >

    <Button 
      android:id="@+id/createNotification"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="產生通知"   
     />
    <Button 
      android:id="@+id/cleanNotification"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="清除通知"   
     />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />


</LinearLayout>

MainActivity中 
首先建設置一個NotificationManager
接著在MainActivity 中 使用Notification.Builder 來設置Notification 物件實例
myNotificationManager=(NotificationManager)

getSystemService(Context.NOTIFICATION_SERVICE);


接下來為Builder create PendingIntent

PendingIntent pi=PendingIntent.getActivity(this, 0, it, 0);

builder.setContentIntent(pi);

最後利用notify 方法傳送notification
myNotificationManager.notify(NOTIFICATION_ID, builder.getNotification())
取消通知時就用 cancel方法
myNotificationManager.cancel(NOTIFICATION_ID);

整段程式如下
package com.example.mynotificationexample;

import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {
private NotificationManager myNotificationManager;
private Button btnCreate,btnClear;
private static final int NOTIFICATION_ID = 1;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btnCreate=

(Button) findViewById(R.id.createNotification);

btnCreate.setOnClickListener(l);

btnClear=(Button)findViewById(R.id.cleanNotification);

btnClear.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
myNotificationManager.cancel(NOTIFICATION_ID);
}
});
}

OnClickListener l=new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
GenerateNotification();
}
}; 

public void  GenerateNotification()
{
myNotificationManager=
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
Notification.Builder builder=new Notification.Builder(this);
builder.setContentTitle("****這是通知抬頭****");
builder.setTicker("***這是通知****");
builder.setSmallIcon(R.drawable.ic_launcher);
builder.setContentText("這真的是通知");
Intent it=new Intent(this,MainActivity.class);
PendingIntent pi=PendingIntent.getActivity(this
, 0, it, 0);
builder.setContentIntent(pi);
myNotificationManager.notify(NOTIFICATION_ID
, builder.getNotification());
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}


}

程式下載