即使已将android应用程序从设备中删除，如何检查是否已安装

Question

有没有一种方法可以检查是否通过另一个Android应用程序在设备中安装了Android应用程序，即使用户已将其从其Android设备中删除

例如：-让我们假设一个用户已经安装了android app A并将其从他/她的设备中删除。 现在我已经安装了Android应用B，如果用户已经安装了应用A，有没有办法检查应用B

Answer 1

please try this method its return whether application is install or not but just you need to pass package name of your app.

private boolean isPackageInstalled(String packagename, Context context) {
    PackageManager pm = context.getPackageManager();
    try {
        pm.getPackageInfo(packagename, PackageManager.GET_ACTIVITIES);
        return true;
    } catch (NameNotFoundException e) {
        return false;
    }
}

Answer 2

尝试这个...

final PackageManager packageManager = getPackageManager();
    List<ApplicationInfo> AppPackages = packageManager.getInstalledApplications(PackageManager.GET_META_DATA);
    for (ApplicationInfo AppPackageInfo : AppPackages) {
        Log.d(TAG, "Installed App Package :" + AppPackageInfo.packageName);
        Log.d(TAG, "Launch Activity :" + packageManager.getLaunchIntentForPackage(AppPackageInfo.packageName));
    }

更新

    private boolean isAppInstalled(String appPackage) {
    boolean isAppExists = false;
    PackageManager packageManager = getPackageManager();
    List<ApplicationInfo> AppPackages = packageManager.getInstalledApplications(PackageManager.GET_META_DATA);
    for (ApplicationInfo appPackageInfo : AppPackages) {
        if (appPackageInfo.packageName.equalsIgnoreCase(appPackage)) {
            isAppExists = true;
            break;
        } else {
            isAppExists = false;
        }
    }
    return isAppExists;
}

在这里，您需要使用应用程序包名称（您想知道的应用程序）调用该方法