Android如何更新app的版本（中級）
版本更新
看看我們要用到哪些技術 1 自定義通知欄
2 HTTP 下載
3 AsyncTask
4 刷新通知欄中的進度條
5 執行 apk安裝的隱士意圖
6 Toast
7簽名(安裝時系統會自動檢測簽名是否一致)
8獲得服務端和客戶端的版本號
上代碼
(1)點擊事件判斷是否有新版本更新 (2)自定義一個通知 同時刷新下載進度
(3) 異步下載新版本app (4) 隱士意圖來安裝
首先別忘了寫權限！！！！！超愛忘得東西 恨死它了
<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>
private Runnable mrun;
private NotificationManager mNotificationManager;
private Notification notification;
private RemoteViews remoteviews;
private int count;
private int loadversion;
private int version;
//升級按鈕點擊事件的方法 通過服務器來解析JSON 得到版本號 判斷是否來通知下載
private void upgrade() {
PackageManager nPackageManager=getPackageManager();//得到包管理器
try {
PackageInfo nPackageInfo=nPackageManager
.getPackageInfo(getPackageName(),PackageManager.GET_CONFIGURATIONS );
loadversion=nPackageInfo.versionCode;//得到現在app的版本號
} catch (NameNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
//服務器端通過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");//得到服務端的app版本號
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if((loadversion<version)){//如果有新版本發送通知開始下載
sendNotification();
}else{ //如果沒有 彈出對話框告知用戶
new AlertDialog.Builder(this)
.setTitle("update cancel")
.setMessage("Sorry Not new Version ")
.setNegativeButton("cencel", null).show();
}
}
//此方法來發送下載通知 採用的是自定義通知欄 並且更加下載的進度來刷新進度條
//自定義通知的方法 在上上篇的博文中 這裏不做太多的解釋
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.p_w_picpathView1, R.drawable.a00);
notification.contentView=remoteviews;
Intent intent=new Intent(this,install.class);//PendingIntent 調用的系統的安裝隱士意圖 後面紅色的代碼
PendingIntent pendingintent=PendingIntent.getActivity(this, 0, intent, 0);
notification.contentIntent=pendingintent;
mrun=new Runnable() {//這個Runnable 用來根據下載進度來刷新進度條
@Override
public void run() {
if(count<98){//紫色的count 是異步下載計算出來設置進度的值
remoteviews.setProgressBar(R.id.progressBar1, 100, count, false);
remoteviews.setTextViewText(R.id.textView1, count+"%");
mNotificationManager.notify(8888, notification);
handler.postDelayed(mrun, 300);
}else{//這裏計算出來的count 不是那麼準確 所以下載完成後 給一個固定值做爲下載完成
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);//提示用戶下載成功
}
}
};
handler.postDelayed(mrun, 300);
Update_AsyncTask mUpdate_AsyncTask=new Update_AsyncTask();
try {//啓動下載
mUpdate_AsyncTask.execute(new URL("http://192.168.14.234/android_project_midiplayonline.apk"));
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//這個內部類用來異步下載新版本app 通過服務端下載這裏不多說了
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();//得到下載的總長度
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);//計算下載的百分百
}
is.close();
} catch (Exception e) {
}return null;
}
}
/*
* 此類爲系統安裝的隱士意圖
*/
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);
//取消上一個通知
NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
nm.cancel(8888);
overridePendingTransition(0, 0);
finish();
}
}
效果如下
