First Android App codelab:

[jawadzd]

I am starting to learn java and use the android studio app to create my own application but after I did all the steps the final step is not working and the app is given me and error "cannot find symbol class navArgs' in the first and the second fragment.java
can you please check the code since I was just copying it and pasting without any changes

[StanleyShen]

no need to import navArgs, it's not used.

[jawadzd]

Did that and I am still left with 2 errors the one underlined with a zigzag red line in fragment 1 and another in the second fragment
and thank you for your time really appreciate it

[StanleyShen]

have you added

        classpath "androidx.navigation:navigation-safe-args-gradle-plugin:$nav_version"

to build.gradle ( Project) and

apply plugin: "androidx.navigation.safeargs"

to build.gradle ( Module)

And compile code, these classes should be generated for you under build/generated/source/

[jawadzd]

Yes i did that in a previous step

[StanleyShen]

you can try to Clean Project and Rebuild Project, it should be there.

[jawadzd]

Just did that and stuck with the same error i can send you all my code line if it can help you figure out what's wrong

[jawadzd]

//first fragment

package jawadscode.counter;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.navigation.fragment.NavHostFragment;

public class FirstFragment extends Fragment {
TextView showCountTextView;

@Override
public View onCreateView(
        LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState

) {

    // Inflate the layout for this fragment
    View fragmentFirstLayout = inflater.inflate(R.layout.fragment_first, container, false);
    // Get the count text view
    showCountTextView = fragmentFirstLayout.findViewById(R.id.textview_first);
    return fragmentFirstLayout;

}

public void onViewCreated(@NonNull View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    view.findViewById(R.id.random_button).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            int currentCount = Integer.parseInt(showCountTextView.getText().toString());
            FirstFragmentDirections.ActionFirstFragmentToSecondFragment action = FirstFragmentDirections.actionFirstFragmentToSecondFragment();

            action.setMyArg(currentCount);
            NavHostFragment.findNavController(FirstFragment.this).navigate(action);
        }
    });
    view.findViewById(R.id.toast_button).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Toast myToast = Toast.makeText(getActivity(), "Hello toast!", Toast.LENGTH_SHORT);
            myToast.show();
        }
    });
    view.findViewById(R.id.count_button).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            countMe(view);
        }
    });
}
private void countMe(View view) {// Get the value of the text view
    String countString = showCountTextView.getText().toString();
    // Convert value to a number and increment it
    Integer count = Integer.parseInt(countString);
    count++;
    // Display the new value in the text view.
    showCountTextView.setText(count.toString());

}

}

[StanleyShen]

you can puts all your code to one repo, so that I can take a look there.

[jawadzd]

i am new to github so having a bit of a hard time here

[jawadzd]

//second fragment
`package jawadscode.counter;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.navigation.fragment.NavHostFragment;

import java.util.Random;

public class SecondFragment extends Fragment {

@Override
public View onCreateView(
        LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState
) {
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragment_second, container, false);
}

public void onViewCreated(@NonNull View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    Integer count = SecondFragmentArgs.fromBundle(getArguments()).getMyArg();
    String countText = getString(R.string.random_heading, count);
    TextView headerView = view.getRootView().findViewById(R.id.textview_header);
    headerView.setText(countText);
    Random random = new java.util.Random();
    Integer randomNumber = 0;
    if (count > 0) {
        randomNumber = random.nextInt(count + 1);
    }
    TextView randomView = view.getRootView().findViewById(R.id.textview_random);
    randomView.setText(randomNumber.toString());
    view.findViewById(R.id.button_second).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            NavHostFragment.findNavController(SecondFragment.this)
                    .navigate(R.id.action_SecondFragment_to_FirstFragment);
        }
    });
}

}`

[jawadzd]

//build .gradle project
`// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
repositories {
google()
jcenter()
}
dependencies {
classpath "com.android.tools.build:gradle:4.0.1"
def nav_version = "2.3.0-alpha04"
classpath "androidx.navigation:navigation-safe-args-gradle-plugin:$nav_version"
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}

allprojects {
repositories {
google()
jcenter()
}
}

task clean(type: Delete) {
delete rootProject.buildDir
}`

[jawadzd]

//build.gradle module
`plugins{
id 'com.android.application'
}
apply plugin: 'com.android.application'
apply plugin: 'androidx.navigation.safeargs'
android {
compileSdkVersion 30
buildToolsVersion "30.0.2"

defaultConfig {
    applicationId "jawadscode.counter"
    minSdkVersion 14
    targetSdkVersion 30
    versionCode 1
    versionName "1.0"

    testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}

buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
    }
}

}

dependencies {
implementation fileTree(dir: "libs", include: ["*.jar"])
implementation 'androidx.appcompat:appcompat:1.2.0'
implementation 'com.google.android.material:material:1.2.1'
implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
implementation 'androidx.navigation:navigation-fragment:2.3.1'
implementation 'androidx.navigation:navigation-ui:2.3.1'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test.ext:junit:1.1.2'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'

}
`

[jawadzd]

sorry for the inconvenient way and thanks for the help

[StanleyShen]

I tried yours, but I cannot see any issue here, please try to see how to create a repo and put your code there so that I can take a look.
Take some time to learn how to use git, it's not hard. :-)

[jawadzd]

I just created a rep and added the files needed you can check them now

[Lifshatz]

I am having the same issue. Did you figure out a solution for this? Can you paste the link to your repo? I'm new to github too. Thanks!

[jawadzd]

hey, no still no luck with the problem and I didn't have time to look through it again
https://github.com/jawadzd/firstapp_androidstudio
that's my repo link

[Lifshatz]

This appears to be the same issue I was having check out my steps for resolution: #80 (comment)

Let me know if that works.

[MohsinIsGood]

This appears to be the same issue I was having check out my steps for resolution: #80 (comment)

Let me know if that works.
Thanks dude

[akashdapra]

Override a destination argument in an action

<action android:id="@+id/action_FirstFragment_to_SecondFragment" app:destination="@id/SecondFragment"> <argument android:name="mrAyg" android:defaultValue="-1" app:argType="integer" /> </action>