Android程序版本更新之通知栏更新下载安装

PackageInfo packageInfo = context.getPackageManager().getPackageInfo(context.getPackageName(), 0);
int localVersion = packageInfo.versionCode; 

/**
* 下载apk
* 
* @param apkUri
*/private void downLoadNewApk(String apkUri, String version) {
manager = (NotificationManager) context
.getSystemService((context.NOTIFICATION_SERVICE));
notify = new Notification();
notify.icon = R.drawable.ic_launcher;
// 通知栏显示所用到的布局文件
notify.contentView = new RemoteViews(context.getPackageName(),
R.layout.view_notify_item);
manager.notify(100, notify);
//建立下载的apk文件
File fileInstall = FileOperate.mkdirSdcardFile("downLoad", APK_NAME
+ version + ".apk");
downLoadSchedule(apkUri, completeHandler, context,
fileInstall);
}

<?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"
android:layout_marginLeft="10dp"
android:background="#00000000"
android:padding="5dp" >
<ImageView
android:id="@+id/notify_icon_iv"
android:layout_width="25dp"
android:layout_height="25dp"
android:src="@drawable/ic_launcher" />
<TextView
android:id="@+id/notify_updata_values_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginBottom="6dp"
android:layout_marginLeft="15dp"
android:layout_marginTop="5dp"
android:layout_toRightOf="@id/notify_icon_iv"
android:gravity="center_vertical"
android:text="0%"
android:textColor="@color/white"
android:textSize="12sp" />
<ProgressBar
android:id="@+id/notify_updata_progress"
style="@android:style/Widget.ProgressBar.Horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@id/notify_icon_iv"
android:layout_marginTop="4dp"
android:max="100" />
</RelativeLayout> 
/**
* 连接网络,下载一个文件,并传回进度
* 
* @param uri
* @param handler
* @param context
* @param file
*/public static void downLoadSchedule(final String uri,
final Handler handler, Context context, final File file) {
if (!file.exists()) {
handler.sendEmptyMessage(-1);
return;
}
// 每次读取文件的长度
final int perLength = 4096;
new Thread() {
@Override
public void run() {
super.run();
try {
URL url = new URL(uri);
HttpURLConnection conn = (HttpURLConnection) url
.openConnection();
conn.setDoInput(true);
conn.connect();
InputStream in = conn.getInputStream();
// 2865412
long length = conn.getContentLength();
// 每次读取1k
byte[] buffer = new byte[perLength];
int len = -1;
FileOutputStream out = new FileOutputStream(file);
int temp = 0;
while ((len = in.read(buffer)) != -1) {
// 写入文件
out.write(buffer, 0, len);
// 当前进度
int schedule = (int) ((file.length() * 100) / length);
// 通知更新进度（10,7,4整除才通知，没必要每次都更新进度）
if (temp != schedule
&& (schedule % 10 == 0 || schedule % 4 == 0 || schedule % 7 == 0)) {
// 保证同一个数据只发了一次
temp = schedule;
handler.sendEmptyMessage(schedule);
}
}
out.flush();
out.close();
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}.start();
}

/**
* 更新通知栏
*/ private Handler completeHandler = new Handler() {
public void handleMessage(android.os.Message msg) {
// 更新通知栏
if (msg.what < 100) {
notify.contentView.setTextViewText(
R.id.notify_updata_values_tv, msg.what + "%");
notify.contentView.setProgressBar(R.id.notify_updata_progress,
100, msg.what, false);
manager.notify(100, notify);
} else {
notify.contentView.setTextViewText(
R.id.notify_updata_values_tv, "下载完成");
notify.contentView.setProgressBar(R.id.notify_updata_progress,
100, msg.what, false);// 清除通知栏
manager.cancel(100);
installApk(fileInstall);
}
};
}; 

/**
* 安装apk
* 
* @param file
*/private void installApk(File file) {
Intent intent = new Intent();
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setAction(android.content.Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(file),
"application/vnd.android.package-archive");
context.startActivity(intent);
}