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

Is there a way to check whether an android application was installed in the device through another android app, even if the user has removed it from his/her android device

For eg:- Let us suppose a user has installed android app A and removed it from his/her device. Now I have installed an Android app B.Is there a way to check through application B, if the user had installed app A

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

Try this...

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));
    }

UPDATED

    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;
}

Here you need to call the method with app package name(the app which you wants to know)