Android APP 检测安装打开 APK 三步操作

本文主要介绍 Android APP 检测、安装、打开 APK，三步操作，分别是：检查 APP 是否已经安装，安装已经下载好的 APK，打开已经安装的 APK

1、检查 APP 是否已经安装

/**
 * 检查APP是否已经安装
 * @param context
 * @param packagename 需求检查的APP包名
 * @return  没有安装返回false，已经安装返回true
 */
private boolean isAppInstalled(Context context, String packagename) {

  PackageInfo packageInfo;
  try {
      packageInfo = context.getPackageManager().getPackageInfo(packagename, 0);
  } catch (NameNotFoundException e) {
      packageInfo = null;
      e.printStackTrace();
  }
  if(packageInfo == null) {
    //System.out.println("没有安装");
    return false;
  } else {
    //System.out.println("已经安装");
    return true;
  }

}

2、安装已经下载好的 apk

/**
 * 安装apk
 * @param info
 */
private void install(String apkname) {
  try {
      Intent intent = new Intent(Intent.ACTION_VIEW);
      String url = Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + Environment.DIRECTORY_DOWNLOADS + apkname);
      File file = new File(url);
    if(file.exists()) {
        intent.setDataAndType(Uri.fromFile(new File(url)), "application/vnd.android.package-archive");
        context.startActivity(intent);
    } else {
      //安装包已经删除请重新下载
    }

  } catch (Exception e) {
    // TODO: handle exception
  }
}

打开已经安装的 apk

/**
 * 打开已经安装好的apk
 * @param url  文件路径
 */
private void openApk(String url) {
  try {
    PackageManager manager = context.getPackageManager();
    // 这里的是你下载好的文件路径
    PackageInfo info = manager.getPackageArchiveInfo(url, PackageManager.GET_ACTIVITIES);
    if (info != null) {
      Intent intent = manager.getLaunchIntentForPackage(info.applicationInfo.packageName);
      context.startActivity(intent);
    }
  } catch (Exception e) {
    // TODO: handle exception
  }
}