Notification中更新进度条

有时我们在下载的时候可以在通知里看到进度条信息，我这里做了一个简单更新进度条的通知。

进度条布局如下notification.xml：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <ImageView
        android:id="@+id/image"
        android:layout_width="wrap_content"
        android:layout_height="fill_parent" />

    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@+id/image"
        android:textColor="#FFF" />

    <ProgressBar
        android:id="@+id/progress_horizontal"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/text"
        android:layout_toRightOf="@+id/image"
        android:max="100"
        android:progress="50" />

</RelativeLayout>

主要的Activity代码如下：
package com.lml.notification;

import java.util.Timer;
import java.util.TimerTask;

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.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.Button;
import android.widget.RemoteViews;

public class MainActivity extends Activity {

RemoteViews remoteView;
int num=0;
Timer timer;
Notification noti ;
NotificationManager mnotiManager;
MyTimerTask task;
boolean isFirst=true;

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

Button sendNotiBt = (Button) findViewById(R.id.sendNotiBt);
sendNotiBt.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
showCustomizeNotification();
}
});

}

private void showCustomizeNotification() {

CharSequence title = "New Notification!";
Notification.Builder builder = new Notification.Builder(MainActivity.this);
builder.setTicker(title);
builder.setSmallIcon(R.drawable.ic_launcher);
builder.setWhen(System.currentTimeMillis());
builder.setAutoCancel(true);
builder.setContentIntent(PendingIntent.getActivity(MainActivity.this, 0, new Intent(Intent.ACTION_DELETE), 0));

noti = builder.build();

remoteView = new RemoteViews(this.getPackageName(), R.layout.notification);
remoteView.setProgressBar(R.id.progress_horizontal, 100, 0, false);
remoteView.setImageViewResource(R.id.image, R.drawable.ic_launcher);
remoteView.setTextViewText(R.id.text, "我的新通知");

noti.contentView = remoteView;

if(isFirst){
timer = new Timer(true); 
task =new MyTimerTask();
timer.schedule(task,0, 1000);
isFirst=false;
}else {
timer.cancel();
task.cancel();
timer = new Timer(true); 
task =new MyTimerTask();
timer.schedule(task,0, 1000);
num=0;
}

mnotiManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
mnotiManager.notify(R.string.app_name, noti);
}

Handler handler = new Handler() {
public void handleMessage(Message msg) {
switch (msg.what) {
case 1:
num+=10;
remoteView.setProgressBar(R.id.progress_horizontal, 100, num, false);
noti.contentView = remoteView;
mnotiManager.notify(R.string.app_name, noti);
if(num>=100){
timer.cancel();
task.cancel();
}
break;
}
super.handleMessage(msg);
}
};

private class MyTimerTask extends TimerTask{
@Override
public void run() {
Message message = new Message();
message.what = 1;
handler.sendMessage(message);
}
}
}

这里我用了定时器来更新进度，可以根据实际情况作相应修改。