[Solved] How can I check if the user has installed an app?

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Define a method that returns true if the PackageManager can find it:

Example:

private boolean checkThisApp(String uri) {
    PackageManager myPackageManager = getPackageManager();
    boolean app_installed;
    try {
        myPackageManager.getPackageInfo(uri, PackageManager.GET_ACTIVITIES);
        app_installed = true;
    }
    catch (PackageManager.NameNotFoundException e) {
        app_installed = false;
    }
    return app_installed;
}

and use it in the Activity/Fragment like:

boolean isAppInstalled = checkThisApp("com.facebook.katana");

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solved How can I check if the user has installed an app?