Button won't open new activity

Question

So im trying to make my buttons open new activities within my navigation drawer fragments but something broke in my MainActivity.java

my MainActivity.java....

   package east.myapplication;


   import android.support.design.widget.NavigationView;
   import android.support.v4.widget.DrawerLayout;
   import android.support.v7.app.ActionBarDrawerToggle;
   import android.support.v7.app.AppCompatActivity;
   import android.os.Bundle;
   import android.support.v7.widget.Toolbar;
   import android.view.MenuItem;

   public class MainActivity extends AppCompatActivity {
   DrawerLayout drawerLayout;
   Toolbar toolbar;
   ActionBarDrawerToggle actionBarDrawerToggle;
   android.support.v4.app.FragmentTransaction fragmentTransaction;
   NavigationView navigationView;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);

    actionBarDrawerToggle = new ActionBarDrawerToggle(this, drawerLayout,    toolbar, R.string.drawer_open,
            R.string.drawer_close);

    drawerLayout.setDrawerListener((actionBarDrawerToggle));

    fragmentTransaction = getSupportFragmentManager().beginTransaction();
    fragmentTransaction.add(R.id.main_container,new HomeFragment());
    fragmentTransaction.commit();
    getSupportActionBar().setTitle("Home Fragment...");
    navigationView = (NavigationView)findViewById(R.id.navigation_view);
    navigationView.setNavigationItemSelectedListener(new     NavigationView.OnNavigationItemSelectedListener() {
        @Override
        public boolean onNavigationItemSelected(MenuItem item) {
            switch (item.getItemId())
            {
                case R.id.home_id:
                    fragmentTransaction =   getSupportFragmentManager().beginTransaction();
                    fragmentTransaction.replace(R.id.main_container, new   HomeFragment());
                    fragmentTransaction.commit();
                    getSupportActionBar().setTitle("Home Fragment");
                    item.setChecked(true);
                    drawerLayout.closeDrawers();
                    break;

                case R.id.id_rewards:
                    fragmentTransaction =   getSupportFragmentManager().beginTransaction();
                    fragmentTransaction.replace(R.id.main_container, new  RewardsFragment());
                    fragmentTransaction.commit();
                    getSupportActionBar().setTitle("Rewards");
                    item.setChecked(true);
                    drawerLayout.closeDrawers();
                    break;

                case R.id.id_settings:
                    fragmentTransaction =   getSupportFragmentManager().beginTransaction();
                    fragmentTransaction.replace(R.id.main_container, new   SettingsFragment());
                    fragmentTransaction.commit();
                    getSupportActionBar().setTitle("Settings Fragment");
                    item.setChecked(true);
                    drawerLayout.closeDrawers();
                    break;
            }



            return true;
        }
    });

}


    @Override
    protected void onPostCreate (Bundle savedInstanceState) {
    super.onPostCreate(savedInstanceState);
    actionBarDrawerToggle.syncState();
}

}

and my rewardsfragment...

    package east.myapplication;

    import android.app.Activity;
    import android.content.Intent;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.Button;


    public class RewardsFragment extends Activity {

    Button button;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.fragment_rewards);
    Button button = (Button) findViewById(R.id.button);
    Button anotherButton = (Button) findViewById(R.id.button2);
    Button anotherButton2 = (Button) findViewById(R.id.button3);
    Button anotherButton3 = (Button) findViewById(R.id.button4);
    Button anotherButton4 = (Button) findViewById(R.id.button5);
    Button anotherButton5 = (Button) findViewById(R.id.button6);
    button.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            Intent intent = new Intent(RewardsFragment.this, AmazonActivity.class);
            RewardsFragment.this.startActivity(intent);
        }
    });

     /* new button to open a new activity */
    anotherButton.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            // creating the intent
            Intent intent = new Intent(RewardsFragment.this, CVSActivity.class);
            // starting activity with the created intent
            startActivity(intent);
        }
    });

     /* new button to open a new activity */
    anotherButton2.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            // creating the intent
            Intent intent = new Intent(RewardsFragment.this, SephoraActivity.class);
            // starting activity with the created intent
            startActivity(intent);
        }
    });

     /* new button to open a new activity */
    anotherButton3.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            // creating the intent
            Intent intent = new Intent(RewardsFragment.this,    PlayStationActivity.class);
            // starting activity with the created intent
            startActivity(intent);
        }
    });

     /* new button to open a new activity */
    anotherButton4.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            // creating the intent
            Intent intent = new Intent(RewardsFragment.this,    AMCActivity.class);
            // starting activity with the created intent
            startActivity(intent);
        }
    });

     /* new button to open a new activity */
    anotherButton5.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            // creating the intent
            Intent intent = new Intent(RewardsFragment.this,             BKActivity.class);
            // starting activity with the created intent
            startActivity(intent);
        }
    });
}

}

The problem is fragmentTransaction.replace(R.id.main_container, new RewardsFragment()); it has a red underline under RewardsFragment and i dont know how to fix it

I tried everything and this is what I have so far..

    package east.myapplication;

    import android.app.Activity;
    import android.content.Intent;
    import android.os.Bundle;
    import android.support.v4.app.FragmentTransaction;
    import android.view.View;
    import android.widget.Button;
    import android.support.v4.app.Fragment;


    public class RewardsFragment extends Fragment {

    Button button;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.fragment_rewards);
    Button button = (Button) findViewById(R.id.button);
    Button anotherButton = (Button) findViewById(R.id.button2);
    Button anotherButton2 = (Button) findViewById(R.id.button3);
    Button anotherButton3 = (Button) findViewById(R.id.button4);
    Button anotherButton4 = (Button) findViewById(R.id.button5);
    Button anotherButton5 = (Button) findViewById(R.id.button6);
    button.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            Intent intent = new Intent(RewardsFragment.this, AmazonActivity.class);
            RewardsFragment.this.startActivity(intent);
        }
    });

 /* new button to open a new activity */
    anotherButton.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            // creating the intent
            Intent intent = new Intent(RewardsFragment.this, CVSActivity.class);
            // starting activity with the created intent
            startActivity(intent);
        }
    });

 /* new button to open a new activity */
    anotherButton2.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            // creating the intent
            Intent intent = new Intent(RewardsFragment.this, SephoraActivity.class);
            // starting activity with the created intent
            startActivity(intent);
        }
    });

 /* new button to open a new activity */
    anotherButton3.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            // creating the intent
            Intent intent = new Intent(RewardsFragment.this,    PlayStationActivity.class);
            // starting activity with the created intent
            startActivity(intent);
        }
    });

 /* new button to open a new activity */
    anotherButton4.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            // creating the intent
            Intent intent = new Intent(RewardsFragment.this,    AMCActivity.class);
            // starting activity with the created intent
            startActivity(intent);
        }
    });

 /* new button to open a new activity */
    anotherButton5.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            // creating the intent
            Intent intent = new Intent(RewardsFragment.this,    BKActivity.class);
            // starting activity with the created intent
            startActivity(intent);
        }
    });}

}

My setContentView is bright red, my findViewByID is red, and lastly (RewardsFragment.this, AmazonActivity.class); is red along with all my other .class's

Here is my bugs

Error:(25, 9) error: cannot find symbol method setContentView(int)

Error:(26, 34) error: cannot find symbol method findViewById(int)

Error:(27, 41) error: cannot find symbol method findViewById(int)

Error:(28, 42) error: cannot find symbol method findViewById(int)

Error:(29, 42) error: cannot find symbol method findViewById(int)

Error:(30, 42) error: cannot find symbol method findViewById(int)

Error:(31, 42) error: cannot find symbol method findViewById(int)

Error:(34, 33) error: no suitable constructor found for Intent(RewardsFragment,Class) constructor Intent.Intent(String,Uri) is not applicable (argument mismatch; RewardsFragment cannot be converted to String) constructor Intent.Intent(Context,Class) is not applicable (argument mismatch; RewardsFragment cannot be converted to Context)

Error:(43, 33) error: no suitable constructor found for Intent(RewardsFragment,Class) constructor Intent.Intent(String,Uri) is not applicable (argument mismatch; RewardsFragment cannot be converted to String) constructor Intent.Intent(Context,Class) is not applicable (argument mismatch; RewardsFragment cannot be converted to Context)

Error:(53, 33) error: no suitable constructor found for Intent(RewardsFragment,Class) constructor Intent.Intent(String,Uri) is not applicable (argument mismatch; RewardsFragment cannot be converted to String) constructor Intent.Intent(Context,Class) is not applicable (argument mismatch; RewardsFragment cannot be converted to Context)

Error:(63, 33) error: no suitable constructor found for Intent(RewardsFragment,Class) constructor Intent.Intent(String,Uri) is not applicable (argument mismatch; RewardsFragment cannot be converted to String) constructor Intent.Intent(Context,Class) is not applicable (argument mismatch; RewardsFragment cannot be converted to Context)

Error:(73, 33) error: no suitable constructor found for Intent(RewardsFragment,Class) constructor Intent.Intent(String,Uri) is not applicable (argument mismatch; RewardsFragment cannot be converted to String) constructor Intent.Intent(Context,Class) is not applicable (argument mismatch; RewardsFragment cannot be converted to Context)

Error:(83, 33) error: no suitable constructor found for Intent(RewardsFragment,Class) constructor Intent.Intent(String,Uri) is not applicable (argument mismatch; RewardsFragment cannot be converted to String) constructor Intent.Intent(Context,Class) is not applicable (argument mismatch; RewardsFragment cannot be converted to Context)

Error:Execution failed for task ':app:compileDebugJavaWithJavac'.

Compilation failed; see the compiler error output for details.

Answer 1

public class RewardsFragment extends Activity

Your "Fragment" actually is an Activity.

Change this to extend Fragment and add a blank public constructor, ie

public class RewardsFragment extends Fragment {

    public RewardsFragment(){
    //Default blank constructor 
    }

    //The rest of your code here

}

On a completely off note, you should really consider using Butterknife for @Bind and @Onclick instead of so many findViewByIds and click listeners in your code. It will help start to clean it up.

Answer 2

You must

RewardsFragment extend Fragment 

import android.support.v4.app.Fragment;

And

anotherButton3.setOnClickListener(new View.OnClickListener() {
    public void onClick(View view) {
        // creating the intent
        Intent intent = new Intent(getActivity,    PlayStationActivity.class);
        // starting activity with the created intent
        getActivity.startActivity(intent);
    }
});

Replace

 case R.id.home_id:
                fragmentTransaction =   getSupportFragmentManager().beginTransaction();
                fragmentTransaction.replace(R.id.main_container, new   HomeFragment());
                fragmentTransaction.commit();
                getSupportActionBar().setTitle("Home Fragment");
                item.setChecked(true);
                drawerLayout.closeDrawers();
                break;

To

 FragmentManager manager = getSupportFragmentManager();
    manager.beginTransaction()
            .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)
            .replace(R.id.content_main, new HomeFragment())
            .commit();

This is example extend Fragment

public class SettingFragment extends Fragment implements View.OnClickListener {
private TextView mTextTest;
 private TextView mTextTest1;


@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_setting, container, false);
    addControl(view);

    return view;
}



private void addControl(View view) {
    mTextTest = (TextView) view.findViewById(R.id.text_test);
mTextTest1 = (TextView) view.findViewById(R.id.text_test_1);
    mTextTest.setOnClickListener(this);
  mTextTest1.setOnClickListener(this);

}


@Override
public void onClick(View v) {

    FragmentManager manager = getActivity().getSupportFragmentManager();
    switch (v.getId()) {
        case R.id.text_test:
            manager.beginTransaction()
                    .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)
                    .replace(R.id.content_main, new YourFragment())
                    .commit();
            break;
   case R.id.text_test_1:
  startActivity(new Intent(getActivity(), YourActivity.class))
            break;
        default:
            break;
    }

}

}