Develop Reference

How to update fragment/update fragment ui from activity?

Pageviewer.java code:
//hide status bar/action bar on single tap
package com.app.imageswiper;
import android.app.ActionBar;
import android.app.Dialog;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.Uri;
import android.os.Handler;
import android.preference.PreferenceManager;
import android.support.design.widget.TabLayout;
import android.support.v4.view.GestureDetectorCompat;
import android.support.v4.view.MotionEventCompat;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.GestureDetector;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;
public class Pageviwer extends AppCompatActivity {
private Integer[] mImageIds = {R.drawable.page001, R.drawable.page002,
R.drawable.page003};
private static final String DEBUG_TAG = "pageviwer ";
ImageView imageView;
float startXValue = 1;
public int num;
public int click;
protected static final String TAG = "Pageviwer";
private GestureDetector mGestureDetector;
public SharedPreferences prefs;
public static int Bookmark = 0;
public static int Pageno = 0;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
prefs = PreferenceManager.getDefaultSharedPreferences(this);
int Bookmark1 = prefs.getInt("Bookmark", 0);
Bookmark = Bookmark1;
prefs = PreferenceManager.getDefaultSharedPreferences(this);
int Pageno1 = prefs.getInt("Pageno", 0);
Pageno = Pageno1;
setContentView(R.layout.pageviwer);
imageView = (ImageView) findViewById(R.id.image_place_holder);
imageView.setImageResource(mImageIds[0]);
TextView tv1 = (TextView) findViewById(R.id.pageno);
tv1.setText("" + (num + 1));
Toast.makeText(getApplicationContext(), "value is " + num, Toast.LENGTH_LONG).show();
setupGestureDetector();
hideActionBar(); // hide action bar after 1 second
}
private void setupGestureDetector() {
mGestureDetector = new GestureDetector(this,
new GestureDetector.SimpleOnGestureListener() {
//Detecting Swipe/Fling Direction
#Override
public boolean onFling(MotionEvent e1, MotionEvent e2,
float velocityX, float velocityY) {
Log.i(TAG, "onFling");
if (e1.getX() < e2.getX()) {
Log.d(TAG, "Left to Right swipe performed");
if (num == 2) {
num = num;
} else {
imageView.setImageResource(mImageIds[num + 1]);
num = num + 1;
}
TextView tv1 = (TextView) findViewById(R.id.pageno);
tv1.setText("" + (num + 1));
Toast.makeText(getApplicationContext(), "value is " + num, Toast.LENGTH_LONG).show();
}
if (e1.getX() > e2.getX()) {
Log.d(TAG, "Right to Left swipe performed");
if (num == 0) {
num = num;
} else {
imageView.setImageResource(mImageIds[num - 1]);
num = num - 1;
}
TextView tv1 = (TextView) findViewById(R.id.pageno);
tv1.setText("" + (num + 1));
Toast.makeText(getApplicationContext(), "value is " + num, Toast.LENGTH_LONG).show();
}
return true;
}
//detecting single tap
#Override
public boolean onSingleTapUp(MotionEvent e) {
Log.i(TAG, "onSingleTapUp");
Toast.makeText(getApplicationContext(), "Single Tap ", Toast.LENGTH_LONG).show();
//Remove notification bar and action bar
if (click == 0) {
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN);
if (getSupportActionBar() != null) getSupportActionBar().hide();
click = 1;
}
//Return notification bar and action bar
else {
getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
getWindow().getDecorView().setSystemUiVisibility(
View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
if (getSupportActionBar() != null) getSupportActionBar().show();
click = 0;
}
return true;
}
});
}
#Override
public boolean onTouchEvent(MotionEvent event) {
if (mGestureDetector != null) {
return mGestureDetector.onTouchEvent(event);
} else {
return super.onTouchEvent(event);
}
}
public void hideActionBar() {
Handler h = new Handler();
h.postDelayed(new Runnable() {
#Override
public void run() {
// DO DELAYED STUFF
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
if (getSupportActionBar() != null) getSupportActionBar().hide();
click = 1;
}
}, 1000); // 1000 milliseconds (1 second)
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.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();
if (id == com.app.imageswiper.R.id.action_settings) {
Bookmark=1;
prefs.edit().putInt("Bookmark", Bookmark).commit();
prefs.edit().putInt("Pageno", num).commit();
Toast.makeText(getApplicationContext(), "Bookmark value is "+Bookmark, Toast.LENGTH_LONG).show();
}
return super.onOptionsItemSelected(item);
}
}
ViewPagerAdapter code:
package com.app.imageswiper;
/**
* Created by Jaffer on 14-Apr-16.
*/
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RelativeLayout;
import android.widget.Toast;
public class Bookmarks extends Fragment {
public SharedPreferences prefs;
public static int Bookmark = 0;
public static int Pageno = 0;
Button sendButton = null;
View inflatedView = null;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
int Bookmark1 = prefs.getInt("Bookmark", 0);
Bookmark = Bookmark1;
prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
int Pageno1 = prefs.getInt("Pageno", 0);
Pageno = Pageno1;
this.inflatedView = inflater.inflate(R.layout.bookmarks, container, false);
sendButton = (Button) inflatedView.findViewById(R.id.bookmark);
if(Bookmark==1){sendButton.setText("Page "+Pageno);}
else {sendButton.setText("No Bookmark ");}
if(sendButton == null)
{
Log.d("debugCheck", "HeadFrag: sendButton is null");
return inflatedView;
}
sendButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(getActivity(), Pageviwer.class);
startActivity(intent);
}
});
return inflatedView;
}
}
bookmarks.xml code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:id="#+id/bookmarks">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAllCaps="false"
style="#style/Widget.AppCompat.Button.Borderless"
android:id="#+id/bookmark"
android:layout_alignParentBottom="true" />
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="#android:color/darker_gray"/>
</LinearLayout>
I don't know how to update the button text from Pageviewer.java for the button with R.id.bookmark that shows up on the Bookmarks fragment on the click of menu item R.id.action_settings. I want to do this so that the button text corresponds to the page that is being bookmarked. I tried alot of things but to no avail. Can someone please help me with anything?
Thanks in advance

Create a method in your fragment to update the text of your button.
public void updateText(String newText){
//assuming button is globally declared in your fragment.
button.setText(newText);
}
Instead of Gesture Detector you could use a ViewPager which supports swiping to the left and right.You can find a sample implementation here.
Then in your Activty,implement PageChanegListener on ViewPager.
viewPager.addOnPageChangeListener(new OnPageChangeListener() {
public void onPageScrollStateChanged(int state) {}
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}
public void onPageSelected(int position) {
// Check if this is the page you want.You have to implement viewpager's adapter with getItem(index) which returns a fragment at that index.
BookMarkFragment fragment (BookMarkFragment)mAdapter.getItem(position);
fragment.updateText(newText);
};
});

You should save the state of a button somewhere. Your field int Bookmark == 0, so expression sendButton.setText("Page "+Pageno); never execute. Save the state in SharedPreferences and get this state. Like this:
prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
int isBookmark = prefs.getInt("Bookmark", 0);
int mPageno = prefs.getInt("Pageno", 0);
...
if(isBookmark == 1){
sendButton.setText("Page " + mPageno);
} else {
sendButton.setText("No Bookmark");
}

How do I switch the if and if else when switching the text between buttons in android studio?

I am trying to switch the text between buttons like a puzzle game using the grid layout. I tried using an if statement but I feel I am doing it wrong. can any one give suggestions? Here is my java code
package com.example.kellito13.test;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Button btn=(Button)findViewById(R.id.btn);
final Button btnOne=(Button)findViewById(R.id.btnOne);
final Button btnTwo=(Button)findViewById(R.id.btnTwo);
final Button btnFive=(Button)findViewById(R.id.btnFive);
btn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if(v == btnOne){
Button btn = (Button) v;
btn.setText("B");
btnOne.setText("A");
}
else if (v == btnFive){
btn.setText("E");
btnFive.setText("A");
}
/* Button btn = (Button) v;
btn.setText("B");
btnOne.setText("A");*/
}
});
btnOne.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Button btnOne = (Button) v;
btn.setText("A");
btnOne.setText("B");
}
});
}
#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);
}
}

Try this way
#Override
public void onClick(View v) {
int id = v.getId();
switch(id){
case R.id.btnOne:
btn.setText("B");
btnOne.setText("A");
break;
case R.id.btnFive:
btn.setText("E");
btnFive.setText("A");
break;
default :
}
}

package com.example.kellito13.test;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends ActionBarActivity Implement View.OnclickListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Button btn=(Button)findViewById(R.id.btn);
final Button btnOne=(Button)findViewById(R.id.btnOne);
final Button btnTwo=(Button)findViewById(R.id.btnTwo);
final Button btnFive=(Button)findViewById(R.id.btnFive);
//In oncreate method register the listener for all button
btn.setOnClickListener(this);
btnOne.setOnClickListener(this);
btnTwo.setOnClickListener(this);
btnFive.setOnClickListener(this);
}
//the following will be your original code....
#Override
public void onClick(View v) {
int id = v.getId();
switch(id){
case R.id.btn:
//do stuff
break;
case R.id.btnOne:
//do stuff
break;
case R.id.btnTwo:
//do stuff
break;
case R.id.btnFive:
//do stuff
break;
default :
//do stuff
}
}
}

Android:Not able to write on textview of main activity when comming from different activity

I created a simple demo program in which there is start button.When i click on start button on main (Home) screen "hi all" appended to Text view.It works fine, But when I change the activity from selecting action bar menu and if again come on the home screen by selecting the action bar home menu then it will not show the "hi all " Message when I click on the Start button.
package com.example.testdemo;
import android.app.ActionBar.LayoutParams;
import android.content.Intent;
import android.os.Bundle;
import android.app.ActionBar;
import android.app.Activity;
import android.text.method.ScrollingMovementMethod;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;
public class MainActivity extends Activity {
private TextView logArea;
private TextView log;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.home);
ActionBar actionBar = getActionBar();
log = new TextView(MainActivity.this);
log.append("Heollosdfsjdf" + "\n");
#SuppressWarnings("deprecation")
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT);
params.gravity = Gravity.LEFT;
log.setLayoutParams(params);
log.setGravity(Gravity.CENTER);
LinearLayout chat = (LinearLayout) findViewById(R.id.main_linear_view);
log.setMovementMethod(new ScrollingMovementMethod());
chat.addView(log);
setDefault();
}
public void setDefault(){
Button btn = (Button) findViewById(R.id.start_recording_button);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
startWriting(v);
}
});
}
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.home:
goHome();
return true;
case R.id.general_setting:
generalSetting();
return true;
case R.id.server_settings:
serverSetting();
return true;
case R.id.audio_settings:
audioSetting();
return true;
default:
break;
}
return true;
}
private void goHome() {
Intent i = new Intent(MainActivity.this, home.class);
startActivity(i);
finish();
}
private void generalSetting() {
Intent i = new Intent(MainActivity.this, general.class);
startActivity(i);
finish();
}
private void audioSetting() {
Intent i = new Intent(MainActivity.this, audio.class);
startActivity(i);
finish();
}
private void serverSetting() {
Intent i = new Intent(MainActivity.this, server.class);
startActivity(i);
finish();
}
public void startWriting(View view) {
logMessage("Hi all");
}
private void logMessage(String msg) {
log.append(msg + "\n");
final int scrollAmount = log.getLayout().getLineTop(log.getLineCount())- log.getHeight();
if (scrollAmount > 0)
log.scrollTo(0, scrollAmount);
else
log.scrollTo(0, 0);
}
}

it's because you called 'finish' when you changed activities. calling the main activity again reloads its view to its initial state.

In addition to MetaSnarf's answer: For a deeper understanding of the "Android Task Stack" and saving of the current Activity state, you might want to take a look at http://developer.android.com/guide/components/tasks-and-back-stack.html

having multiple choice game that will calculate the score of the user but the system crush out

i have a sample android application that will display flag of coutry and multiple choice using radio button and each time the user check one of the answers the system will check if true and add 25 points to its score using intent to pass from activity to another with transferring the data mean the score until the user play 4 times to get to the end where the system will display his score .
until now i did the MainActivity that pass the data to the second but the problem is that the system force to close and in the log cat this what its display:
can anyone help me to solve this problem ????
logcat
11-27 22:15:53.609: E/AndroidRuntime(4834): Caused by: java.lang.NullPointerException
11-27 22:15:53.609: E/AndroidRuntime(4834): at com.devleb.flagology.SecondActivity.onCreate(SecondActivity.java:56)
MainActivity.java
package com.devleb.flagology;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.Toast;
public class MainActivity extends Activity {
Button btnS;
RadioGroup rdgS;
RadioButton rdS1, rdS2, rdS3, rdS4;
private int score =0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
rdgS = (RadioGroup) findViewById(R.id.rdg1);
rdgS.setOnCheckedChangeListener(new OnCheckedChangeListener() {
#Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
// TODO Auto-generated method stub
if (rdS1.isChecked() || rdS2.isChecked() || rdS3.isChecked()
|| rdS4.isChecked()) {
btnS.setVisibility(View.VISIBLE);
}
}
});
rdS1 = (RadioButton) findViewById(R.id.rd_s1);
rdS2 = (RadioButton) findViewById(R.id.rd_s2);
rdS3 = (RadioButton) findViewById(R.id.rd_s3);
rdS4 = (RadioButton) findViewById(R.id.rd_s4);
btnS = (Button) findViewById(R.id.btn_s);
btnS.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(MainActivity.this, SecondActivity.class);
switch (rdgS.getCheckedRadioButtonId()) {
case R.id.rd_s1:
i.putExtra("score", score);
break;
case R.id.rd_s2:
i.putExtra("score", score);
break;
case R.id.rd_s3:
i.putExtra("score", score + 25);
break;
case R.id.rd_s4:
i.putExtra("score", score);
break;
default:
break;
}
startActivity(i);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
switch (item.getItemId()) {
case R.id.hint_icon:
ShowAlertDialog();
break;
case R.id.about_icon:
Toast.makeText(this, "developed by Georges Matta",
Toast.LENGTH_SHORT).show();
default:
break;
}
return super.onOptionsItemSelected(item);
}
public void ShowAlertDialog() {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Hint")
.setMessage("The famouse sport is Bullfighting")
.setCancelable(false)
.setNegativeButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog alert = builder.create();
alert.show();
}
}
SecondActivity.java
package com.devleb.flagology;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.RadioGroup.OnCheckedChangeListener;
public class SecondActivity extends Activity {
Button btnI;
RadioGroup rdgI;
RadioButton rdI1, rdI2, rdI3, rdI4;
// TextView txt_result;
private int score = 0;
int finalScore = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
Bundle extras = getIntent().getExtras();
if (extras != null) {
int value = extras.getInt("score");
finalScore = score + value;
rdgI = (RadioGroup) findViewById(R.id.rdg2);
rdgI.setOnCheckedChangeListener(new OnCheckedChangeListener() {
#Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
// TODO Auto-generated method stub
if (rdI1.isChecked() || rdI2.isChecked()
|| rdI3.isChecked() || rdI4.isChecked()) {
btnI.setVisibility(View.VISIBLE);
}
}
});
rdI1 = (RadioButton) findViewById(R.id.rd_I1);
rdI2 = (RadioButton) findViewById(R.id.rd_I2);
rdI3 = (RadioButton) findViewById(R.id.rd_I3);
rdI4 = (RadioButton) findViewById(R.id.rd_I4);
btnI = (Button) findViewById(R.id.btn_s);
btnI.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(SecondActivity.this,
ThirdActivity.class);
switch (rdgI.getCheckedRadioButtonId()) {
case R.id.rd_I1:
i.putExtra("score", finalScore);
break;
case R.id.rd_I2:
i.putExtra("score", finalScore);
break;
case R.id.rd_I3:
i.putExtra("score", finalScore);
break;
case R.id.rd_I4:
i.putExtra("score", finalScore);
break;
default:
break;
}
startActivity(i);
}
});
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.second, menu);
return true;
}
}
ThirdActivity.java
package com.devleb.flagology;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.widget.TextView;
public class ThirdActivity extends Activity {
TextView txt_result;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_third);
txt_result = (TextView) findViewById(R.id.txtResult);
Bundle extras = getIntent().getExtras();
if (extras != null) {
String value = String.valueOf(extras.getInt("score"));
txt_result.setText(value);
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.third, menu);
return true;
}
}

I would venture to guess that your problem comes from this line:
btnS = (Button) findViewById(R.id.btn_s);
Most likely you made changes to your main activity layout (R.layout.activity_main) and either renamed or removed the <Button> element from it. If my guess is correct, then this line will fail to find the view in the inflated layout, and your btnS object will be null, leading to the actual exception you see.

onActivityResult Is not responding when choosing from a list

Hi Guys I am new with android programming and Java. I am trying to make a travel app. My issue is that how do I pass data from the selected item from the list to the editText filed. This is out I have done so far.. Pls. be kind I am newbee
The activity class that uses the ListActivity
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
public class SelectStationActivity extends ListActivity {
String stations[] = { "Acton Main Line","Ealing","Great Western","Albany Park"};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ArrayAdapter <String> adapter =new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, stations);
setListAdapter(adapter);
}
protected void OnListItemClick(ListView l, View v, int position, long id) {
String values = stations[(int) id];
Intent result = new Intent().putExtra("SELECTED_STATION_NAME", values);
setResult(RESULT_OK, result);
finish();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.select_station, menu);
return true;
}
The main class
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.widget.SimpleCursorAdapter.ViewBinder;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class TravelActivity extends Activity {
// The request code for the selectChkInBt
protected static final int SelectChkin_REQUEST_CODE = 1;
// The request code for the selectChkOutBt
protected static final int SelectChkout_REQUEST_CODE = 2;
private String checkinStation;
private String checkoutStation;
private Button checkinButton, checkoutButton, selectChkInButton, selectChkOutButton;
private EditText checkinEditText, checkoutEditText;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_travel);
checkinButton = (Button) findViewById(R.id.btCkIn);
checkoutButton = (Button) findViewById(R.id.BtChkOut);
selectChkInButton = (Button) findViewById(R.id.btselectChkIn);
selectChkOutButton = (Button) findViewById(R.id.btselectChkOut);
checkinEditText = (EditText) findViewById(R.id.EditTxtChkIn);
checkoutEditText = (EditText) findViewById(R.id.EditTxtChkOut);
checkinButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (checkinEditText.getText().toString().equals("")) {
Toast.makeText(TravelActivity.this,
"Enter Check-in Station", Toast.LENGTH_LONG).show();
} else {
checkinStation = checkinEditText.getText().toString();
// Enable the check-out EditText and Button
checkinEditText.setEnabled(false);
checkinEditText.setTextColor(Color.CYAN);
checkinButton.setEnabled(false);
// Disable the check-in- EdiText AND Button
checkoutEditText.setEnabled(true);
checkoutButton.setEnabled(true);
checkoutEditText.requestFocus();
}
}
});
checkoutButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (checkoutEditText.getText().toString().equals("")) {
Toast.makeText(TravelActivity.this,
"Enter Check-Out station", Toast.LENGTH_LONG)
.show();
} else {
checkoutStation = checkoutEditText.getText().toString();
// Clear edit Text
checkoutEditText.setText("");
// Enable the check-in EditText and Button
checkoutEditText.setEnabled(false);
checkoutButton.setEnabled(false);
/*
* Disable the check-out EditText and Button, to allow the
* eternal cycle of checking in and out to commence once again */
checkinEditText.setText("");
checkinEditText.setEnabled(true);
checkinButton.setEnabled(true);
checkinEditText.requestFocus();
Toast.makeText(getApplicationContext(),
"Travel information added!", Toast.LENGTH_SHORT)
.show();
}
}
});
I could implement a inner class for the two select buttons but i have diffculties to do it.Pls. provide some help how I could implement it thanks.
selectChkInButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(TravelActivity.this,
SelectStationActivity.class);
startActivityForResult(intent, SelectChkin_REQUEST_CODE);
}
});
selectChkOutButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(TravelActivity.this,SelectStationActivity.class);
startActivityForResult(intent, SelectChkout_REQUEST_CODE);
}
});
}
The onActivityResult is not responding here
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode== RESULT_OK){
if (requestCode == 1) {
checkinEditText.setText(data.getStringExtra("SELECTED_STATION_NAME"));
}
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuItem item = menu.add(Menu.NONE, Menu.FIRST, Menu.NONE, "Recipt");
item.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
return true;
}
public boolean OnMenuItemSelected(int featureId, MenuItem item) {
String Recipt = "Recipt" + item.getItemId() + "\nCheck-in: "
+ checkinStation + "\nCheck-Out: " + checkoutStation;
Toast.makeText(getApplicationContext(), Recipt, Toast.LENGTH_LONG)
.show();
return true;
}
protected void OnSaveInstanceState(Bundle outState) {
outState.putString("lAST_CHECKIN", checkinStation);
outState.putString("lAST_CHECKOUT", checkoutStation);
}
protected void onRestoreInstance(Bundle savedInstanceState) {
checkinStation = savedInstanceState.getString(checkinStation);
checkoutStation = savedInstanceState.getString(checkoutStation);
}
}

You Should use this
checkinEditText.setText(data.getStringExtra("SELECTED_STATION_NAME"));
as
checkinEditText.setText(data.getStringExtra("SELECTED_STATION_NAME").toString());