今天学习通知栏Notification使用自定义视图方法，这里以显示进度条ProgressBar为例，具体效果不上图了，请参考在Android Market下载软件时通知栏的效果。 布局XML：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<Button android:id="@+id/bt1"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:text="Notification测试"
/>
<Button android:id="@+id/bt2"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:text="清除Notification"
/>
</LinearLayout>
跟前面学习notification的例子一样，没改一个字。 既然要使用自定义的布局，当然要自己写xml文件：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
>
<TextView android:id="@+id/down_tv"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:textSize="20sp"
android:textColor="#000000"
android:text="下载中"
/>
<ProgressBar android:id="@+id/pb"
android:layout_width="260dip"
android:layout_height="wrap_content"
style="?android:attr/progressBarStyleHorizontal"
android:layout_gravity="center_vertical"/>
</LinearLayout>
一个TextView显示下载中，下面一根进度条显示当前进度 程序代码：
package com.pocketdigi.Notification;
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.os.Handler;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.RemoteViews;
public class main extends Activity {
/** Called when the activity is first created. */
int notification_id=19172439;
NotificationManager nm;
Handler handler=new Handler();
Notification notification;
int count=0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button bt1=(Button)findViewById(R.id.bt1);
bt1.setOnClickListener(bt1lis);
Button bt2=(Button)findViewById(R.id.bt2);
bt2.setOnClickListener(bt2lis);
//建立notification,前面有学习过，不解释了，不懂看搜索以前的文章
nm=(NotificationManager)getSystemService(NOTIFICATION_SERVICE);
notification=new Notification(R.drawable.home,"图标边的文字",System.currentTimeMillis());
notification.contentView = new RemoteViews(getPackageName(),R.layout.notification);
//使用notification.xml文件作VIEW
notification.contentView.setProgressBar(R.id.pb, 100,0, false);
//设置进度条，最大值 为100,当前值为0，最后一个参数为true时显示条纹
//（就是在Android Market下载软件，点击下载但还没获取到目标大小时的状态）
Intent notificationIntent = new Intent(this,main.class);
PendingIntent contentIntent = PendingIntent.getActivity(this,0,notificationIntent,0);
notification.contentIntent = contentIntent;
}
OnClickListener bt1lis=new OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
showNotification();//显示notification
handler.post(run);
}
};
Runnable run=new Runnable(){
@Override
public void run() {
// TODO Auto-generated method stub
count++;
notification.contentView.setProgressBar(R.id.pb, 100,count, false);
//设置当前值为count
showNotification();//这里是更新notification,就是更新进度条
if(count<100) handler.postDelayed(run, 200);
//200毫秒count加1
}
};
OnClickListener bt2lis=new OnClickListener(){
@Override
public void onClick(View v) {
nm.cancel(notification_id);
//清除notification
}
};
public void showNotification(){
nm.notify(notification_id, notification);
}
}
就这样。源代码下载：[download id=”9”]