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版本更新所需要的技术:
1 自定义通知栏
2 HTTP 下载
3 AsyncTask
4 刷新通知栏中的进度条
5 执行 apk安装的隐士意图
6 Toast
7签名(安装时系统会自动检测签名是否一致)
8获得服务端和客户端的版本号上代码
1)点击事件判断是否有新版本更新
2)自定义一个通知,同时刷新现在进度
3)异步下载新版本app
4)隐示意图安装
- 所需权限
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
<uses-permission android:name="android.permission.INSTALL_PACKAGES"></uses-permission>
- 代码实现
private Runnable mrun;
private NotificationManager mNotificationManager;
private Notification notification;
private RemoteViews remoteviews;
private int count;
private int loadversion;
private int version;
//升级按钮点击事件的方法 通过服务器来解析JSON 得到版本号 判断是否来通知下载
private void upgrade() {
PackageManager nPackageManager=getPackageManager();//得到包管理器
try {
PackageInfo nPackageInfo=nPackageManager
.getPackageInfo(getPackageName(),PackageManager.GET_CONFIGURATIONS );
loadversion=nPackageInfo.versionCode;//得到现在app的版本号
} catch (NameNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
//服务器端通过GET 得到JSON
String json=JSandBitmap.httpGetDemo("http://192.168.14.234/version.json");
try {
JSONArray jsonArray=new JSONArray(json);
JSONObject jsonObject=jsonArray.getJSONObject(0);
version = jsonObject.getInt("version");//得到服务端的app版本号
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if((loadversion<version)){//如果有新版本发送通知开始下载
sendNotification();
}else{ //如果没有 弹出对话框告知用户
new AlertDialog.Builder(this)
.setTitle("update cancel")
.setMessage("Sorry Not new Version ")
.setNegativeButton("cencel", null).show();
}
}
//此方法来发送下载通知 采用的是自定义通知栏 并且更加下载的进度来刷新进度条
//自定义通知的方法 在上上篇的博文中 这里不做太多的解释
private void sendNotification() {
mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notification = new Notification(
R.drawable.player_play_light, "Midiplay",
System.currentTimeMillis());
remoteviews= new RemoteViews("com.tarena.gsd110623.midiplayonline", R.layout.mynotiifcation);
remoteviews.setImageViewResource(R.id.imageView1, R.drawable.a00);
notification.contentView=remoteviews;
Intent intent=new Intent(this,install.class);//PendingIntent 调用的系统的安装隐士意图 后面红色的代码
PendingIntent pendingintent=PendingIntent.getActivity(this, 0, intent, 0);
notification.contentIntent=pendingintent;
mrun=new Runnable() {//这个Runnable 用来根据下载进度来刷新进度条
@Override
public void run() {
if(count<98){//紫色的count 是异步下载计算出来设置进度的值
remoteviews.setProgressBar(R.id.progressBar1, 100, count, false);
remoteviews.setTextViewText(R.id.textView1, count+"%");
mNotificationManager.notify(8888, notification);
handler.postDelayed(mrun, 300);
}else{//这里计算出来的count 不是那么准确 所以下载完成后 给一个固定值做为下载完成
remoteviews.setProgressBar(R.id.progressBar1, 100, 100, false);
remoteviews.setTextViewText(R.id.textView1, 100+"%");
mNotificationManager.notify(8888, notification);
Toast.makeText(Welcome.this, "download over", Toast.LENGTH_SHORT);//提示用户下载成功
}
}
};
handler.postDelayed(mrun, 300);
Update_AsyncTask mUpdate_AsyncTask=new Update_AsyncTask();
try {//启动下载
mUpdate_AsyncTask.execute(newURL("http://192.168.14.234/android_project_midiplayonline.apk"));
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//这个内部类用来异步下载新版本app 通过服务端下载这里不多说了
class Update_AsyncTask extends AsyncTask<URL, Integer, Object>{
@Override
protected Object doInBackground(URL... params) {
// TODO Auto-generated method stub
try {
URLConnection con = params[0].openConnection();
if (HttpURLConnection.HTTP_OK != ((HttpURLConnection)con).getResponseCode())
{
Log.i("Main", "connection failed");
return null;
}
InputStream is = con.getInputStream();
int contentlength=con.getContentLength();//得到下载的总长度
System.out.println(contentlength);
File file=new File(Constant.APK_FILE_PATH);
if(!file.exists()){
file.getParentFile().mkdirs();
file.createNewFile();
}
FileOutputStream out=new FileOutputStream(file);
int current = 0;
int x=0;
byte[]arr=new byte[1024];
while ( (current = is.read(arr)) != -1 ){
out.write(arr, 0, current);
x=x+current;
count=(int)(100*x/contentlength);//计算下载的百分百
}
is.close();
} catch (Exception e) {
}return null;
}
}
/*
* 此类为系统安装的隐士意图
*/
public class install extends Activity{
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
Intent notify_Intent = new Intent(Intent.ACTION_VIEW);
notify_Intent.setDataAndType(Uri.fromFile(new File(Constant.APK_FILE_PATH)), "application/vnd.android.package-archive");
startActivity(notify_Intent);
//取消上一个通知
NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
nm.cancel(8888);
overridePendingTransition(0, 0);
finish();
}
}