android利用service实现下载apk自动更新功能

使用时只需要修改apk下载保存的路径和保存名称，还有通知栏布局的图片，改为自己app的图标即可

service的实现如下

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.view.View;
import android.widget.RemoteViews;
import android.widget.Toast;

import com.zznode.jsyw.R;
import com.zznode.jsyw.util.constant.Constants;

/**
* @author Shuai8172
* @date 2014年5月4日 下午2:14:33
* @description
* @version 1.0
*/
public class UpdateService extends Service {
/** 服务的运行状态，0:未运行 1:正在运行 */
public static int state = 0;
/** 连接和读取的超时时间 */
private static final int TIMEOUT = 10*1000;
/** 下载中，更新通知栏 */
private static final int DOWN_GOING = 0;
/** 下载完成 */
private static final int DOWN_OK = 1;
/** 下载失败 */
private static final int DOWN_ERROR = 2;
/** 下载取消 */
private static final int DOWN_CANCEL = 3;
//下载路径
private static final String SAVEPATH = "download";//使用时根据自己实际情况修改地址
//下载保存文件名
private static final String SAVENAME = "new.apk";<span style="font-family: Arial, Helvetica, sans-serif; font-size: 12px;">//使用时根据自己实际情况修改地址</span>
private static final int notification_id=0;
private NotificationManager notificationManager;
private Notification notification;
private PendingIntent pendingIntent;
private String downUrl;
private File saveFile;
private Thread downThread;

@Override
public void onCreate() {
super.onCreate();
notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
state = 1;
}

@Override
public void onDestroy() {
super.onDestroy();
state = 0;
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
String command = intent.getStringExtra("command");
if("start".equals(command)){
downUrl = intent.getStringExtra("downUrl");
if(downUrl!=null && !downUrl.equals("")){
if(!creatFile()){// 创建文件
Toast.makeText(this, "创建文件失败,请检查SD卡是否正常", Toast.LENGTH_SHORT).show();
stopSelf();
return super.onStartCommand(intent, flags, startId);
}
createNotification();// 创建通知
createThread();// 线程下载}
}
}else if("cancle".equals(command)){
// 取消下载
Message msg = handler.obtainMessage(DOWN_CANCEL);
handler.sendMessage(msg);
}
return super.onStartCommand(intent, flags, startId);
}

private boolean creatFile() {
if (android.os.Environment.MEDIA_MOUNTED.equals(android.os.Environment
.getExternalStorageState())) {
File rootFile = new File(Environment.getExternalStorageDirectory()
+ File.separator + SAVEPATH);
if (rootFile != null && !rootFile.exists()) {
rootFile.mkdirs();
}
saveFile = new File(rootFile, SAVENAME);
return true;
}
return false;
}

@Override
public IBinder onBind(Intent intent) {
return null;
}

/***
* 创建通知栏
*/
RemoteViews contentView;
public void createNotification() {
notification = new Notification();
notification.icon = android.R.drawable.stat_sys_download;// 这个图标必须要设置，不然下面那个RemoteViews不起作用.
// 这个参数是通知提示闪出来的值.
notification.tickerText = "开始下载";
notification.flags |= Notification.FLAG_ONGOING_EVENT|Notification.FLAG_NO_CLEAR;

//使用自定的view来显示Notification
contentView = new RemoteViews(getPackageName(),
R.layout.notification_item);
// contentView.setImageViewResource(R.id.notificationIcon, R.drawable.ic_launcher);
contentView.setTextViewText(R.id.notificationTitle, "正在下载");
contentView.setTextViewText(R.id.notificationPercent, "0%");
contentView.setProgressBar(R.id.notificationProgress, 100, 0, false);
contentView.setViewVisibility(R.id.btnCancel, View.VISIBLE);
contentView.setOnClickPendingIntent(R.id.btnCancel, PendingIntent
.getService(this, 0, new Intent(this,UpdateService.class).putExtra("command",
"cancle"), 0));
notification.contentView = contentView;
notificationManager.notify(notification_id, notification);

}

/***
* 更新UI
*/
final Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case DOWN_GOING:
// 改变通知栏
int updateCount = msg.arg1;
contentView.setTextViewText(R.id.notificationPercent,
updateCount + "%");
contentView.setProgressBar(R.id.notificationProgress, 100,
updateCount, false);
// show_view
notificationManager.notify(notification_id, notification);
break;
case DOWN_OK:
// 下载完成，准备安装
notification.tickerText = "下载完成,准备安装";
notification.flags = Notification.FLAG_AUTO_CANCEL|Notification.FLAG_NO_CLEAR;
contentView.setTextViewText(R.id.notificationTitle, "下载完成，点击安装");
contentView.setViewVisibility(R.id.btnCancel, View.INVISIBLE);
Uri uri = Uri.fromFile(saveFile);
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(uri,"application/vnd.android.package-archive");
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
pendingIntent = PendingIntent.getActivity(UpdateService.this, 0, intent, 0);
notification.contentIntent = pendingIntent;
notificationManager.notify(notification_id, notification);
startActivity(intent);
stopSelf();
break;
case DOWN_ERROR:
notification.tickerText = "下载失败";
contentView.setTextViewText(R.id.notificationTitle, "下载失败");
notification.flags = Notification.FLAG_AUTO_CANCEL;
Intent backintent = new Intent(UpdateService.this, ControllActivity.class);
backintent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
pendingIntent = PendingIntent.getActivity(UpdateService.this, 0, backintent, 0);

notification.contentIntent = pendingIntent;
notificationManager.notify(notification_id, notification);
stopSelf();
break;
case DOWN_CANCEL:
if(downThread != null && downThread.isAlive()){
downThread.interrupt();
}
notificationManager.cancel(notification_id);
stopSelf();
break;
default:
stopSelf();
break;
}

}

};
/**
* 开线程下载
*/
public void createThread() {

final Message message = handler.obtainMessage();

downThread = new Thread(new Runnable() {
@Override
public void run() {

try {
boolean result = downloadUpdateFile(downUrl,
saveFile.getPath());
if (result) {
// 下载成功，准备安装
message.what=DOWN_OK;
handler.sendMessage(message);
}

} catch (IOException e) {
message.what=DOWN_ERROR;
handler.sendMessageDelayed(message,2000);
}

}
});
downThread.start();
}
/**
* 下载文件
*
* @return
* @throws IOException
*/
public boolean downloadUpdateFile(String downUrl, String file) throws IOException{
int downStep = 1;// 提示step
int totalSize = 0;// 文件总大小
int downloadCount = 0;// 已经下载好的大小
int updateCount = 0;// 已经下载的百分比
InputStream inputStream;
OutputStream outputStream;

HttpURLConnection httpURLConnection;
URL url = new URL(downUrl);
httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setConnectTimeout(TIMEOUT);
httpURLConnection.setReadTimeout(TIMEOUT);
// 获取下载文件的size
totalSize = httpURLConnection.getContentLength();
if (httpURLConnection.getResponseCode() == 404) {
throw new IOException("文件不存在!");
}
inputStream = httpURLConnection.getInputStream();
outputStream = new FileOutputStream(file, false);// 文件存在则覆盖掉
try {
byte buffer[] = new byte[1024];
int readsize = 0;
while ((readsize = inputStream.read(buffer)) != -1
&& !Thread.currentThread().isInterrupted()) {
outputStream.write(buffer, 0, readsize);
downloadCount += readsize;// 时时获取下载到的大小
// 根据downStep更新
if (updateCount == 0
|| (downloadCount * 100 / totalSize - downStep) >= updateCount) {
updateCount += downStep;
// 改变通知栏
Message msg = handler.obtainMessage(DOWN_GOING);
msg.arg1 = updateCount;
handler.sendMessage(msg);
}
}
} finally {
if (httpURLConnection != null) {
httpURLConnection.disconnect();
}
inputStream.close();
outputStream.close();
}
return totalSize!=0&&totalSize==downloadCount;
}

}自定义的通知栏布局文件notification_item.xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
android:padding="3dp" >

<ImageView
android:id="@+id/notificationIcon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/sys_ico"
android:layout_gravity="center_vertical"
android:contentDescription="@string/edit_null" />

<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_marginLeft="15dp"
android:orientation="vertical" >

<RelativeLayout
android:layout_width="fill_parent"
android:layou
9216
t_height="wrap_content" >

<ImageView
android:id="@+id/notificationImage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:contentDescription="@string/edit_null"
android:src="@android:drawable/stat_sys_download" />

<TextView
android:id="@+id/notificationTitle"
android:layout_toRightOf="@id/notificationImage"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />

<TextView
android:id="@+id/notificationPercent"
android:layout_toRightOf="@id/notificationTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<ImageButton
android:id="@+id/btnCancel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:src="@android:drawable/ic_delete"
android:background="@null"
android:padding="0dp"
android:contentDescription="@string/edit_null"/>
</RelativeLayout>

<ProgressBar
android:id="@+id/notificationProgress"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>

</LinearLayout>