Fidel_Willis Fidel_Willis - 4 months ago 11
Java Question

How to display other layouts

I am new at android development and just trying to learn along the way!

I am creating an android app that I would like to show different views, one for weight, weather, and hydration (are what I have called them for now). Although when I run my app I only get my one view displayed.

What code do I have to add/modify in order to display the other two layouts in the tabbed view?

Here is my code in MainActivity.java

package com.oxinc.android.drate;

import android.support.design.widget.TabLayout;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;

import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

int quantity = 0;
String outcome = "";
int required = 0;
int height = 0;

/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {@link FragmentPagerAdapter} derivative, which will keep every
* loaded fragment in memory. If this becomes too memory intensive, it
* may be best to switch to a
* {@link android.support.v4.app.FragmentStatePagerAdapter}.
*/
private SectionsPagerAdapter mSectionsPagerAdapter;

/**
* The {@link ViewPager} that will host the section contents.
*/
private ViewPager mViewPager;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);

//Tabbed Layout
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);

//Floating Action Button
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Are you hydrated?", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();

//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}

return super.onOptionsItemSelected(item);
}

/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";

public static PlaceholderFragment fragment_main() {
PlaceholderFragment fragment = new PlaceholderFragment();
return fragment;
}

/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static PlaceholderFragment weight(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View hydration = inflater.inflate(R.layout.hydration, container, false);
return hydration;
}
}

/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {

public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}

@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
return PlaceholderFragment.weight(position + 1);
}

@Override
public int getCount() {
// Show 3 total pages.
return 3;
}

@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "Hydration";
case 1:
return "Weigh In";
case 2:
return "Weather";
}
return null;
}
}

public void eight(View view) {
quantity = quantity + 8;
displayQuantity(quantity);
}

public void twelve(View view) {
quantity = quantity + 12;
displayQuantity(quantity);
}

public void sixteen(View view) {
quantity = quantity + 16;
displayQuantity(quantity);
}

public void thirty_two(View view) {
quantity = quantity + 32;
displayQuantity(quantity);
}

public void sixty_four(View view) {
quantity = quantity + 64;
displayQuantity(quantity);
}

//Reset Button
public void reset(View view) {
quantity = 0;
displayQuantity(quantity);
outcome = "";
displayOutcome(outcome);
}

//Starts the basic formula for oz. per day
public int height(int value) {
EditText height = (EditText) findViewById(R.id.height);
String height_value = height.getText().toString();
int int_height = Integer.parseInt(height_value);

if (int_height >= 60) {
required = 64;
}
return required;
}
/**
* This method is called when the check button is clicked.
*/
public String check(View view) {

height((int) height);
if (quantity >= required) {
outcome = "You have met your goal!!";
} else {
outcome = "Keep trying you are almost there";
}
displayOutcome(outcome);
return outcome;
}

//Displays the Outcome to the outcome text view
public void displayOutcome(String n) {
TextView outcomeTextView = (TextView) findViewById(
R.id.outcome_text_view);
outcomeTextView.setText(outcome);
}

/**
* This method displays the given quantity value on the screen.
*/
public void displayQuantity(int quantity) {
TextView quantityTextView = (TextView) findViewById(
R.id.quantity_text_view);
quantityTextView.setText(quantity + "");
}

}


An once I run it I just get three screens that look like this...

the display

Answer

Inside your
public Fragment getItem(int position) {
which is inside your
public class SectionsPagerAdapter extends FragmentPagerAdapter {
Implement this:

    @Override
    public Fragment getItem(int position) {
        switch (position) {
            case 0:
                return new fragment1();
            case 1:
                return new fragment2();
            case 2:
                return new fragment3();
            default:
                // this should never happen
                return null;
                //return new Fragment();
        }
    }

Where "fragment1-2 and 3" are the name of the java classes you've defined to run there.

I use my "getItem" exactly this way, with nothing more inside it. So I don't know if you have to maintain your return PlaceholderFragment.weight(position + 1); there. Try commenting it out and see what happens. I don't use createview either. Best.

Comments