Android 获取未安装的APK图标、版本号、包名等信息方法

 public static Drawable getApkIcon(Context context, String apkPath) {
  PackageManager pm = context.getPackageManager();
  PackageInfo info = pm.getPackageArchiveInfo(apkPath,
    PackageManager.GET_ACTIVITIES);
  if (info != null) {
   ApplicationInfo appInfo = info.applicationInfo;
   appInfo.sourceDir = apkPath;
   appInfo.publicSourceDir = apkPath;
   try {
    return appInfo.loadIcon(pm);
   } catch (OutOfMemoryError e) {
    Log.e("ApkIconLoader", e.toString());
   }
  }
  return null;
 }

String label = appInfo.loadLabel(mPackManager).toString(); 

String packageName = appInfo.packageName; 

String version = info.versionName==null?<p ></p><p >"0":info.versionName</p>

private boolean isApkInstalled(String packagename)
	 {
	 PackageManager localPackageManager = getPackageManager();
	 try
	 {
	  PackageInfo localPackageInfo = localPackageManager.getPackageInfo(packagename, PackageManager.GET_UNINSTALLED_PACKAGES);
	  return true;
	 }
	 catch (PackageManager.NameNotFoundException localNameNotFoundException)
	 {
	  return false;
	 }
	 
	 }

private void installAPK(String apkPath) 
 { 
  Intent intent = new Intent(); 
  intent.setAction(Intent.ACTION_VIEW); 
  intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
  intent.setDataAndType(Uri.parse("file://" + apkPath), 
    "application/vnd.android.package-archive"); 
  mContext.startActivity(intent); 
 } 

private void openAPK(String packagename) 
  { 
   PackageManager packageManager = mContext.getPackageManager(); 
   Intent intent=new Intent(); 
   intent =packageManager.getLaunchIntentForPackage(packagename); 
   mContext.startActivity(intent); 
  }