自定义Notification模拟数据下载状态栏的提示

运行效果图:

修改activity_main.xml文件:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
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=".MainActivity" >

<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="自定义Notification控件展示系统提示下载" />
<Button
android:id="@+id/btnSend"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="发送下载命令"/>
<Button
android:id="@+id/btnClear"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="清除下载进度条"/>

</LinearLayout>

新建自定义mynotification.xml布局,代码:

<?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" >
<!-- 自定义的Notification布局 -->
<TextView
android:id="@+id/Tv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="left"
android:text="正在下载" />
<!-- 定义一个进度条 -->
<ProgressBar
android:id="@+id/Pb"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical" />

</LinearLayout>

修改MainActivity.java文件,代码:

import android.os.Bundle;
import android.os.Handler;
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.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.RemoteViews;

public class MainActivity extends Activity {
private Button btnSend,btnClear;//定义Button控件
//定义NotificationManager对象
private NotificationManager nm;
//定义一个Notification对象
private Notification notification;
//记录进度条的进度
private int count=0;
//记录进度条是否取消
private Boolean isClear=false;
//定义Notification的id
private int notification_id=1;
//定义主线程的Handler对象
private Handler handler=new Handler();

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);//清楚标题
setContentView(R.layout.activity_main);
findById();//获取控件对象
SendNotification();
}
private void SendNotification() {
//得到NotificationManager的服务对象
nm=(NotificationManager) getSystemService(NOTIFICATION_SERVICE);
////初始化Notification
notification=new Notification(R.drawable.bg, "开始下载", System.currentTimeMillis());
//得到Notification的视图对象
notification.contentView=new RemoteViews(getPackageName(),R.layout.mynotification);
//设置视图中的ProgressBar对象
notification.contentView.setProgressBar(R.id.Pb, 100, 0, false);
//定义单机通知的事件
Intent notificationIntent=new Intent(this, MainActivity.class);
PendingIntent contentIntent= PendingIntent.getActivity(this, 0, notificationIntent, 0);
notification.contentIntent=contentIntent;
}
//自定义按钮单机监听器
OnClickListener mylis=new OnClickListener() {
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.btnClear:
nm.cancel(notification_id);//取消notification
break;
case R.id.btnSend:
showNotification();
handler.post(run);
break;
default:
break;
}
}

};
//定义线程Runnable对象进行进度更新
Runnable run=new Runnable() {
@Override
public void run() {
//如果线程没取消
if(!isClear){
count++;//更新进度
notification.contentView.setProgressBar(R.id.Pb, 100, count, false);
//更新notification就是更新进度条
showNotification();
if(count<100){
//两百毫秒之后count+1
handler.postDelayed(run,200);
}
if(count==100){
isClear=true;
nm.cancel(notification_id);//取消notification
sendNotification(R.drawable.bg, "下载成功", "水木年华.MP3", "5.60M");
}
}
}
};
//显示Notification
private void showNotification() {
nm.notify(notification_id, notification);
}
private void findById() {
btnSend=(Button) findViewById(R.id.btnSend);
btnSend.setOnClickListener(mylis);
btnClear=(Button) findViewById(R.id.btnClear);
btnClear.setOnClickListener(mylis);
}

//发送一个Notification系统通知,参数1:图片ID,参数2:显示notification对象的提示内容,参数3:状态栏中显示的标题,参数4:状态栏中的信息
private void sendNotification(int imageId,String titleText,String showTitleText,String content){
//得到系统的Notification服务对象
NotificationManager manager=(NotificationManager)
this.getSystemService(Context.NOTIFICATION_SERVICE);
//创建一个Notification对象
Notification notification=new Notification();
//设置显示的Notification对象的图标
//			notification.icon=R.drawable.notification_bg;
notification.icon=imageId;//接收参数的图片信息
//设置显示的notification对象的内容
//			notification.tickerText="您有一条新的消息!";
notification.tickerText=titleText;//接收参数的内容

//设置显示Notification对象的声音
notification.defaults=Notification.DEFAULT_SOUND;
//设置显示notification对象的声音模拟
notification.audioStreamType=android.media.AudioManager.ADJUST_LOWER;

//定义单机Notification的时间Intent
Intent intent=new Intent(this, MainActivity.class);
PendingIntent pendingIntent=PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_ONE_SHOT);
//单机状态栏的图标出现的提示信息设置
//			notification.setLatestEventInfo(this, "消息内容", "认识你很高心!", pendingIntent);
notification.setLatestEventInfo(this, showTitleText, content, pendingIntent);
//发送Notification消息
manager.notify(1, notification);
}

}