Main activity in java
package com.android.pnyjt3;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;
import android.content.Intent;
import android.content.res.Configuration;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
// variable declaration
Button pressMe;
EditText inputField;
TextView outputField;
String myInputString = "";
// Creating Point
// Callback when an Activity is created .
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// To connect from backend to Frontend
setContentView(R.layout.activity_main);
Log.d("MainActivity","onCreate");
pressMe = findViewById(R.id.pressMe);
inputField = findViewById(R.id.inputField);
outputField = findViewById(R.id.outputField);
pressMe.setOnClickListener(new View.OnClickListener() {
// polymorphism
@Override
public void onClick(View view) {
// this code will be executed when the button us clicked
// this will get the text which is written on the input field and store in String
myInputString = inputField.getText().toString();
// this will show the data stored in myInputString
outputField.setText(myInputString);
int age = 30;
setUpFragment();
// Intent // which is responsible for all the transition
Intent moveToNextActivity = new Intent(MainActivity.this,FragmentActivity.class);
startActivity(moveToNextActivity);
}
});
}
public void setUpFragment(){
// Instance of you Fragment
FirstFragment firstFragment = new FirstFragment();
Bundle bundle = new Bundle();
bundle.putString("inputField",myInputString);
firstFragment.setArguments(bundle);
/*
// Manager of all the fragments
FragmentManager fm = getSupportFragmentManager();
// help in Transaction of Fragment
FragmentTransaction ft = fm.beginTransaction();
// add the Fragment to be moved
ft.add(R.id.frame,firstFragment);
// Action
ft.commit();*/
getSupportFragmentManager().beginTransaction().add(R.id.frame,firstFragment).commit();
}
@Override
public void onConfigurationChanged(@NonNull Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Checks the orientation of the screen
if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {
Toast.makeText(this, "landscape", Toast.LENGTH_SHORT).show();
} else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT) {
Toast.makeText(this, "portrait", Toast.LENGTH_SHORT).show();
}
}
// Starting Point
// Callback when an Activity is started .
@Override
protected void onStart() {
super.onStart();
Log.d("MainActivity","onStart");
// Server Data
// Database Data
// Server Connection
}
// Activity running Point
// Callback when an Activity is started .
@Override
protected void onResume() {
super.onResume();
Log.d("MainActivity","onResume");
}
@Override
protected void onPause() {
super.onPause();
Log.d("MainActivity","onPause");
}
@Override
protected void onStop() {
super.onStop();
Log.d("MainActivity","onStop");
}
@Override
protected void onDestroy() {
super.onDestroy();
Log.d("MainActivity","onDestroy");
}
boolean doubleBackToExitPressedOnce = false;
@Override
public void onBackPressed() {
if (doubleBackToExitPressedOnce) {
super.onBackPressed();
return;
}
this.doubleBackToExitPressedOnce = true;
Toast.makeText(this, "Please click BACK again to exit", Toast.LENGTH_SHORT).show();
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
doubleBackToExitPressedOnce=false;
}
}, 2000);
}
}
main activity xml code
import android.os.Bundle;
import androidx.fragment.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class FirstFragment extends Fragment {
TextView textView;
String inputFromPrevoiousFragment;
// Empty Constructor
public FirstFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater,
ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_first, container, false);
Bundle bundle = getArguments();
inputFromPrevoiousFragment = bundle.getString("inputField");
textView = v.findViewById(R.id.textView);
textView.setText(inputFromPrevoiousFragment);
textView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
setUpFragment();
}
});
return v;
}
public void setUpFragment(){
// Instance of you Fragment
SecondFragment secondFragment = new SecondFragment();
/*
// Manager of all the fragments
FragmentManager fm = getSupportFragmentManager();
// help in Transaction of Fragment
FragmentTransaction ft = fm.beginTransaction();
// add the Fragment to be moved
ft.add(R.id.frame,firstFragment);
// Action
ft.commit();*/
method 2 another way to share infromation getActivity().getSupportFragmentManager().beginTransaction().add(R.id.frame,secondFragment).commit();
}
}
import android.os.Bundle;
import androidx.fragment.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class SecondFragment extends Fragment {
public SecondFragment() {
// Required empty public constructor
}
@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);
}
}
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