Android implementation of packageManager to obtain all installer information

This article describes the method of Android implementing the PackageManager to obtain all installer information. Share it for your reference, as follows:

List&lt;PackageInfo&gt; packs = getPackageManager().getInstalledPackages(0);//Get the package name of the installerfor (int i = 0; i &lt; (); i++) {
 PackageInfo p = (i);//A package information //Print: good version, version name, package name... ("", "-------" +  + "-------" +  + "--------" 
  +  + "-------" + );
}

versionCode, versionName value source file

<manifest xmlns:andro
   package=""
   android:versionCode="2" //  
   android:versionName="Version1" // 
>

Get the versionCode of the current application, versionName

int versionCode = 0;
try {
  versionCode = getPackageManager().getPackageInfo((), 0).versionCode;
} catch (NameNotFoundException e) {
  ();
}

Code:

// Check the package name to determine whether the APK is installedprivate boolean checkPackageExist(boolean getSysPackages) {
 boolean packageExist = false;
 int versionCode = 0;
 try {
  versionCode = getPackageManager().getPackageInfo((), 0).versionCode;
 } catch (NameNotFoundException e) {
  ();
 }
 ("", "-------" + () + "-------" + versionCode);//Get the current package name List&lt;PackageInfo&gt; packs = getPackageManager().getInstalledPackages(0);
 for (int i = 0; i &lt; (); i++) {
  PackageInfo p = (i);
  ("", "-------" +  + "-------" +  + "--------" 
   +  + "-------" + );
  if ((!getSysPackages) &amp;&amp; ( == null)) {
  continue;
  }
  if ((PACKAGENAME)) {
  packageExist = true;
  break;
  }
 }
 return packageExist;
 }
 //Installing APK private void installApk() {
 if (checkFileExist(fileRoot + fileName)) {
  Intent intent = new Intent();
  (Intent.FLAG_ACTIVITY_NEW_TASK);
  (.ACTION_VIEW);
  String type = "application/-archive";
  (("file://" + fileRoot + fileName),
   type);
  startActivity(intent);
 } else {
  downloadapk();
 }
}

Through the above code and some online download code, you can create a simplified application market.

I hope this article will be helpful to everyone's Android programming design.