Android Learning Series (3)-custom progress view and internal storage for automatic app update

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This articleArticleIt is a must-have knowledge for Android Developers. It is not perfect but useful for everyone.

This article is a supplement to the previous "android Learning Series (2) -- download in the notification bar of APP Auto Update", so it is only for the point and ends.
1. Internal Storage
In consideration of the possibility that the user has disabled sdcard or the computer is temporarily inserted on the computer and is in the disk connection status, we should also ensure that ourProgramIt can also run normally. Therefore, we need to consider internal storage.
I have set the internal storage to the/data/xxxxxappxxxx/Files directory.CodeAs follows:

 
// Create a directory and file if (Android. OS. environment. media_mounted.equals (Android. OS. environment. getexternalstoragestate () {updatedir = new file (environment. getexternalstoragedirectory (), Global. downloaddir);} else {// Files directory updatedir = getfilesdir ();} updatefile = new file (updatedir. getpath (), getresources (). getstring (titleid) + ". APK ");
 

 2. Internal Storage Permissions
All of them run normally, but when we execute the running operation for the APK file, the prompt is as follows,
 
"Parsing package error "?? In fact, the file you downloaded may not necessarily be bad or wrong, or the permission of the Android system may be improper. Add the following core code before execution:

 
String cmd = "chmod + X" + updatefile. getpath (); try {runtime.getruntime(.exe C (CMD);} catch (ioexception e) {e. printstacktrace ();}
 

3. A bug of the progress bar component is displayed in the notification bar.
Setting the visibility of the progress bar in the notification bar will crash for no reason.

 
// There is no syntax error in the following sentence, but it will cause a program error // to solve this problem, we will wrap a layer of linearlayout outside the progressview to control the visibility updatenotification. contentview. setviewvisibility (progressviewid, view. gone );
 

4. view the custom progress bar.
Layout file updata_nitification.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 = "vertical" Android: layout_weight = "2" Android: paddingleft = "5dip"> <linearlayout Android: layout_width = "fill_parent" Android: layout_height = "fill_parent" Android: gravity = "Left | weight" Android: Orientation = "horizontal" Android: layout _ Weight = "1"> <imageview Android: src = "@ drawable/icon" Android: layout_width = "24dip" Android: layout_height = "fill_parent" Android: scaletype = "fitcenter"/> <textview Android: layout_width = "wrap_content" Android: layout_height = "wrap_content" Android: text = "@ string/app_name" Android: textcolor = "#000000" Android: paddingleft = "5dip" Android: textsize = "16dip"/> </linearlayout> <linearlayout Android: layout_width = "fi Ll_parent "Android: layout_height =" fill_parent "Android: gravity =" Left "Android: Orientation =" horizontal "Android: layout_weight =" 1 "> <textview Android: id = "@ + ID/update_icationication_progresstext" Android: layout_width = "wrap_content" Android: layout_height = "wrap_content" Android: textcolor = "# 8f8f8f" Android: textsize = "14dip"/> <linearlayout Android: Id = "@ + ID/update_icationication_progressblock" Android: Layout _ Width = "fill_parent" Android: layout_height = "wrap_content" Android: Orientation = "horizontal"> <progressbar Android: Id = "@ + ID/update_icationication_progressbar" Android: layout_width = "fill_parent" Android: layout_height = "wrap_content" style = "? Android: ATTR/progressbarstylehorizontal "/> </linearlayout>

Start download:

 
Updatenotification. contentintent = updatependingintent; updatenotification. contentview. setprogressbar (COM. cnblogs. tianxia. subway. r. id. update_icationication_progressbar, 100, 0, false); updatenotification. contentview. settextviewtext (COM. cnblogs. tianxia. subway. r. id. update_icationication_progresstext, "0% ");
 

Downloading. The download progress bar is displayed:

 
Updatenotification. contentview. setprogressbar (COM. cnblogs. tianxia. subway. r. id. update_notification_progressbar, 100, (INT) (totalsize * 100/updatetotalsize), false); updatenotification. contentview. settextviewtext (COM. cnblogs. tianxia. subway. r. id. update_notification_progresstext, (INT) (totalsize * 100/updatetotalsize) + "%"); updatenotificationmanager. notify (0, updatenotification );
 

download complete. Click to install:

 // click to install pendingintent uri = Uri. fromfile (updatefile); intent installintent = new intent (intent. action_view); installintent. setdataandtype (Uri, "application/vnd. android. package-Archive "); updatependingintent = pendingintent. getactivity (UpdateService. this, 0, installintent, 0); updatenotification. defaults = notification. default_sound; // ringtone notification updatenotification. c Ontentintent = updatependingintent; // install the updatenotification interface. contentview. setviewvisibility (COM. cnblogs. tianxia. subway. r. id. update_icationication_progressblock, view. gone); updatenotification. contentview. settextviewtext (COM. cnblogs. tianxia. subway. r. id. update_icationication_progresstext, "Download complete. Click" Install! "); Updatenotificationmanager. Y (0, updatenotification); 

as follows:
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