Android application not installing

Support
1

Hello Friends,

Following method does not installing app while app is not exist into mobile device

@Test(priority = 0)
public void verify_AppInstalled() {

    try {

        //String appId="com.google.android.youtube";
        if(driver.isAppInstalled("com.materialism.mypunelocals")==true) {
            System.out.println("App is already Installed into device");
        }
        else {
            driver.installApp("D:\\myPuneLocal\\mypunelocals.apk");
            System.out.println("New App installed into device");
        }
    }catch (Exception e) {
        System.out.println(driver);
        System.out.println("Something wrong in app installation");
        e.getStackTrace();
    }
}

please help me