判断Android应用是否安装、运行

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本文介绍3个方法，判断手机上是否安装了某应用、该应用是否正在运行、获取手机某个APK文件的安装Intent.启动该Intent就可以直接安装该APK。

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/**  * 判断应用是否已安装  *   * @param context  * @param packageName  * @return  */  private boolean isInstalled(Context context, String packageName) {      boolean hasInstalled = false;      PackageManager pm = context.getPackageManager();      List<PackageInfo> list = pm              .getInstalledPackages(PackageManager.PERMISSION_GRANTED);      for (PackageInfo p : list) {          if (packageName != null && packageName.equals(p.packageName)) {              hasInstalled = true;              break;          }      }      return hasInstalled;  }

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/**  * 获取文件安装的Intent  *   * @param file  * @return  */  private Intent getFileIntent(File file) {      Uri uri = Uri.fromFile(file);      String type = "application/vnd.android.package-archive";      Intent intent = new Intent("android.intent.action.VIEW");      intent.addCategory("android.intent.category.DEFAULT");      intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);      intent.setDataAndType(uri, type);      return intent;  }

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/**  * 判断应用是否正在运行  *   * @param context  * @param packageName  * @return  */  private boolean isRunning(Context context, String packageName) {      ActivityManager am = (ActivityManager) context              .getSystemService(Context.ACTIVITY_SERVICE);      List<RunningAppProcessInfo> list = am.getRunningAppProcesses();      for (RunningAppProcessInfo appProcess : list) {          String processName = appProcess.processName;          if (processName != null && processName.equals(packageName)) {              return true;          }      }      return false;  }