Android不同版本下Notification创建方法

Posted 2020-07-11

项目环境

Project Build Target：android 6.0

 

问题：

使用 new Notification(int icon, CharSequence tickerText, long when)构造函数时，Eclipse却提示：" The constructor Notification(int, CharSequence, long) is deprecated "

源码如下：

/**
* Constructs a Notification object with the information needed to
* have a status bar icon without the standard expanded view.
*
* @param icon The resource id of the icon to put in the status bar.
* @param tickerText The text that flows by in the status bar when the notification first
* activates.
* @param when The time to show in the time field. In the System.currentTimeMillis
* timebase.
*
* @deprecated Use {@link Builder} instead.
*/
@Deprecated
public Notification(int icon, CharSequence tickerText, long when)
{
　　this.icon = icon;
　　this.tickerText = tickerText;
　　this.when = when;
}

　　在不同的版本下Notification使用有一些不同，涉及到Builder的使用。现在总结如下，希望对以后使用的程序员有所帮助。

 
　　低于API Level 11版本，也就是Android 2.3.3以下的系统中，setLatestEventInfo()函数是唯一的实现方法。前面的有关属性设置这里就不再提了，网上资料很多。

Intent  intent = new Intent(this,MainActivity);  
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_ONE_SHOT);  
notification.setLatestEventInfo(context, title, message, pendingIntent);          
manager.notify(id, notification); 

　　高于API Level 11，低于API Level 16 (Android 4.1.2)版本的系统中，可使用Notification.Builder来构造函数。但要使用getNotification()来使notification实现。此时，前面版本在notification中设置的Flags，icon等属性都已经无效，要在builder里面设置。

Notification.Builder builder = new Notification.Builder(context)  
            .setAutoCancel(true)  
            .setContentTitle("title")  
            .setContentText("describe")  
            .setContentIntent(pendingIntent)  
            .setSmallIcon(R.drawable.ic_launcher)  
            .setWhen(System.currentTimeMillis())  
            .setOngoing(true);  
notification=builder.getNotification();

　　高于API Level 16的版本，就可以用Builder和build()函数来配套的方便使用notification了。

Notification notification = new Notification.Builder(context)    
         .setAutoCancel(true)    
         .setContentTitle("title")    
         .setContentText("describe")    
         .setContentIntent(pendingIntent)    
         .setSmallIcon(R.drawable.ic_launcher)    
         .setWhen(System.currentTimeMillis())    
         .build();

    【注意点】：
    在构造notification的时候有很多种写法，但是要注意，用
　　Notification notification = new Notification();
　　这种构建方法的时候，一定要加上notification.icon这个设置，不然，程序虽然不会报错，但是会没有效果。 

问题：

使用了Notification下的setLatestEventInfo()方法时，Eclipse却提示：“ The method setLatestEventInfo(Context, String, String, PendingIntent) is undefined for the type Notification”！

查看源码：

/**
* Sets the {@link #contentView} field to be a view with the standard "Latest Event"
* layout.
*
* <p>Uses the {@link #icon} and {@link #when} fields to set the icon and time fields
* in the view.</p>
* @param context The context for your application / activity.
* @param contentTitle The title that goes in the expanded entry.
* @param contentText The text that goes in the expanded entry.
* @param contentIntent The intent to launch when the user clicks the expanded notification.
* If this is an activity, it must include the
* {@link android.content.Intent#FLAG_ACTIVITY_NEW_TASK} flag, which requires
* that you take care of task management as described in the
* <a href="{@docRoot}guide/topics/fundamentals/tasks-and-back-stack.html">Tasks and Back
* Stack</a> document.
*
* @deprecated Use {@link Builder} instead.
* @removed
*/
@Deprecated

public void setLatestEventInfo(Context context,
CharSequence contentTitle, CharSequence contentText, PendingIntent contentIntent) {
Notification.Builder builder = new Notification.Builder(context);

// First, ensure that key pieces of information that may have been set directly
// are preserved
builder.setWhen(this.when);
builder.setSmallIcon(this.icon);
builder.setPriority(this.priority);
builder.setTicker(this.tickerText);
builder.setNumber(this.number);
builder.setColor(this.color);
builder.mFlags = this.flags;
builder.setSound(this.sound, this.audiostreamType);
builder.setDefaults(this.defaults);
builder.setVibrate(this.vibrate);
builder.setDeleteIntent(this.deleteIntent);

// now apply the latestEventInfo fields
if (contentTitle != null) {
builder.setContentTitle(contentTitle);
}
if (contentText != null) {
builder.setContentText(contentText);
}
builder.setContentIntent(contentIntent);
builder.buildInto(this);
}

setLatestEventInfo方法已被removed。