PackageUtils

import android.content.Context;
import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.net.Uri;
import java.io.File;
public class PackageUtils {
   protected static final String TAG = PackageUtils.class.getSimpleName();

   /**
    * 安装apk应用
    */
   public static void installAPK(Context context, File apkFile) {
      if (apkFile.isFile()) {
         String fileName = apkFile.getName();
         String postfix = fileName.substring(fileName.length() - 4, fileName.length());
         if (postfix.toLowerCase().equals(".apk")) {
            String cmd = "chmod 755 " + apkFile.getAbsolutePath();
            try {
               Runtime.getRuntime().exec(cmd);
            } catch (Exception e) {
               Logger.e(TAG, e.getLocalizedMessage());
            }
            Uri uri = Uri.fromFile(apkFile);
            Intent intent = new Intent(Intent.ACTION_VIEW);
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            intent.setDataAndType(uri, "application/vnd.android.package-archive");
            context.startActivity(intent);
         }
      } else if (apkFile.isDirectory()) {
         File[] files = apkFile.listFiles();
         int fileCount = files.length;
         for (int i = 0; i < fileCount; i++) {
            installAPK(context, files[i]);
         }
      }
   }

   /**
    * 安装apk应用
    */
   public static void installDirApk(Context context, String filePath) {
      File file = new File(filePath);
      installAPK(context, file);
   }

   /**
    * 卸载apk文件
    */
   public static void uninstallPackage(Context context, Uri packageUri) {
      Intent intent = new Intent(Intent.ACTION_DELETE, packageUri);
      context.startActivity(intent);
   }

   /**
    * 根据包得到应用信息
    */
   public static ApplicationInfo getApplicationInfoByName(Context context, String packageName) {
      if (null == packageName || "".equals(packageName)) {
         return null;
      }
      try {
         return context.getPackageManager().getApplicationInfo(packageName, PackageManager.GET_UNINSTALLED_PACKAGES);
      } catch (NameNotFoundException e) {
         Logger.e("EspanceUtils", packageName + " NameNotFoundException");
         return null;
      }
   }

   /**
    *  通过包名获取包信息
    */
   public static PackageInfo getPackageInfoByName(Context context, String packageName) {
      if (null == packageName || "".equals(packageName)) {
         return null;
      }
      try {
         return context.getPackageManager().getPackageInfo(packageName, PackageManager.GET_UNINSTALLED_PACKAGES);
      } catch (NameNotFoundException e) {
         Logger.e(TAG, e.getLocalizedMessage());
         return null;
      }
   }

   /**
    * 判断apk包是否安装
    */
   public static boolean isApkIntalled(Context context, String packageName) {
      if (null == getApplicationInfoByName(context, packageName)) {
         return false;
      } else {
         return true;
      }
   }
}