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How to fix activity not showing when run

I am creating a chat app in which you can create groups. to create groups I have created a new activity. it shows up in preview but won't show up when I run the app and open the activity. I tried on another phone and only the CircleImageView showed up. but it's OnClickListner won't work. there are no errors while compiling, logging or debbugging.
I have even tried breakpoints to check the error, but no output. Exept for the ad shows up. tried changing layouts but nothing shows up.
I don't know the error so I am pasting the CreateGroupActivity.java file as well as activity_create_group.xml
CreateGroupActivity.java:
package com.satyamedh.chitchatmessenger;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import com.google.android.gms.ads.AdListener;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdView;
import com.google.android.gms.ads.MobileAds;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.theartofdev.edmodo.cropper.CropImage;
import com.theartofdev.edmodo.cropper.CropImageView;
import de.hdodenhof.circleimageview.CircleImageView;
public class CreateGroupActivity extends AppCompatActivity
{
private CircleImageView circleImageView;
private EditText editText;
private Button buttonconf, buttoncanc;
private final static int chosenProfileImage = 1;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_create_group);
initializeFields();
buttoncanc.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent profileIntent = new Intent(CreateGroupActivity.this, MainActivity.class);
startActivity(profileIntent);
}
});
buttonconf.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (TextUtils.isEmpty(editText.getText())){
Toast.makeText(CreateGroupActivity.this, "Please enter text..", Toast.LENGTH_SHORT).show();
}
}
});
circleImageView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent galleryIntent = new Intent();
galleryIntent.setAction(Intent.ACTION_GET_CONTENT);
galleryIntent.setType("image/*");
startActivityForResult(galleryIntent, chosenProfileImage);
}
});
}
#Override
protected void onActivityResult(int requestCode, int resultCode, #Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == chosenProfileImage && resultCode == RESULT_OK && data != null)
{
Uri imageUri = data.getData();
CropImage
.activity()
.setGuidelines(CropImageView.Guidelines.ON)
.start(this);
}
if (requestCode == CropImage.CROP_IMAGE_ACTIVITY_REQUEST_CODE)
{
final CropImage.ActivityResult result = CropImage.getActivityResult(data);
if(resultCode == RESULT_OK) {
assert result != null;
Uri resultUri = result.getUri();
DatabaseReference rootref = FirebaseDatabase.getInstance().getReference();
Intent settingsIntent = new Intent(CreateGroupActivity.this, chooseUserActivity.class);
String key = rootref.push().getKey();
settingsIntent.putExtra("groupKey", key);
settingsIntent.putExtra("groupImage", resultUri);
settingsIntent.putExtra("groupName", editText.getText().toString());
startActivity(settingsIntent);
}
}
}
private void initializeFields()
{
MobileAds.initialize(this, "ca-app-pub-3127817354023186~6842500243");
final AdView mAdView;
mAdView = findViewById(R.id.my_adView_createGroup);
AdRequest adRequest = new AdRequest.Builder().build();
mAdView.loadAd(adRequest);
mAdView.setAdListener(new AdListener() {
#Override
public void onAdLoaded() {
// Code to be executed when an ad finishes loading.
}
#Override
public void onAdFailedToLoad(int errorCode) {
// Code to be executed when an ad request fails.
}
#Override
public void onAdOpened() {
// Code to be executed when an ad opens an overlay that
// covers the screen.
}
#Override
public void onAdClicked() {
// Code to be executed when the user clicks on an ad.
}
#Override
public void onAdLeftApplication() {
// Code to be executed when the user has left the app.
}
#Override
public void onAdClosed() {
// Code to be executed when the user is about to return
// to the app after tapping on an ad.
}
});
circleImageView = findViewById(R.id.create_group_image);
editText = findViewById(R.id.create_group_name);
buttonconf = findViewById(R.id.confirm_button);
buttoncanc = findViewById(R.id.cancel_button);
}
}
activity_create_group.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".CreateGroupActivity">
<de.hdodenhof.circleimageview.CircleImageView
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:layout_marginStart="51dp"
android:layout_marginTop="87dp"
android:layout_marginEnd="259dp"
android:layout_marginBottom="551dp"
android:src="#drawable/profile_image"
android:id="#+id/create_group_image"/>
<EditText
android:layout_width="250dp"
android:layout_height="50dp"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:layout_marginStart="167dp"
android:layout_marginTop="88dp"
android:layout_marginEnd="4dp"
android:layout_marginBottom="596dp"
android:background="#drawable/inputs"
android:id="#+id/create_group_name"
android:inputType="text"
android:hint="Group name here"/>
<Button
android:id="#+id/confirm_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:layout_marginStart="168dp"
android:layout_marginTop="141dp"
android:layout_marginEnd="156dp"
android:layout_marginBottom="542dp"
android:text="Confirm"
android:background="#drawable/buttons"/>
<Button
android:id="#+id/cancel_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:layout_marginStart="263dp"
android:layout_marginTop="140dp"
android:layout_marginEnd="60dp"
android:layout_marginBottom="546dp"
android:text="Cancel"
android:background="#drawable/buttons"/>
<com.google.android.gms.ads.AdView
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:id="#+id/my_adView_createGroup"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_alignParentBottom="true"
ads:adSize="SMART_BANNER"
ads:adUnitId="ca-app-pub-3940256099942544/6300978111">
</com.google.android.gms.ads.AdView>
</RelativeLayout>
android phone(redmi 2) screenshot:
https://drive.google.com/file/d/18MMzLvcdIi8iLog1nR_NrJPcJf-NZG51/view?usp=sharing
pc android studio screenshot:
https://drive.google.com/file/d/1E3Suy967AS3aQS9TEkUlAh5kPjWr86u-/view?usp=sharing
I am newbie to stackoverflow so I can't attach images. sorry.
no errors also.

it's normal because you used so much alignment value and attribute which made your layout not responsive , please use the xml below and don't forget to add the image:src and background you wanted
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".CreateGroupActivity">
<de.hdodenhof.circleimageview.CircleImageView
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_margin="20dp"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:id="#+id/create_group_image"/>
<EditText
android:layout_toRightOf="#id/create_group_image"
android:layout_width="250dp"
android:layout_marginTop="20dp"
android:layout_height="wrap_content"
android:id="#+id/create_group_name"
android:inputType="text"
android:hint="Group name here"/>
<Button
android:layout_below="#id/create_group_name"
android:layout_toRightOf="#id/create_group_image"
android:id="#+id/confirm_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Confirm"/>
<Button
android:layout_below="#id/create_group_name"
android:layout_toRightOf="#id/confirm_button"
android:id="#+id/cancel_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Cancel"/>
<com.google.android.gms.ads.AdView
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:id="#+id/my_adView_createGroup"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_alignParentBottom="true"
ads:adSize="SMART_BANNER"
ads:adUnitId="ca-app-pub-3940256099942544/6300978111">
</com.google.android.gms.ads.AdView>
</RelativeLayout>

java programming language and android development

good evening dear friends, I'm working with SQLite db and android android applications I have a problem with my button when I click on login activity the message "could not execute for android onClick" my code are:
for LoginDatabaseAdapter.java class:
package com.delaroystudios.bus_seat_booking_system;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
/**
* Created by mugenzi israel on 9/19/2017.
*/
public class LoginDataBaseAdapter {
static final String DATABASE_NAME = "login.db";
static final int DATABASE_VERSION = 1;
static final String TABLE_NAME ="LOGIN";
public static final int NAME_COLUMN = 1;
static final String DATABASE_CREATE = "CREATE TABLE" + TABLE_NAME + "(" + " ID " + " INTEGER PRIMARY KEY AUTOINCREMENT," + " USERNAME text, PASSWORD text );";
public SQLiteDatabase db;
private Context context ;
private DataBaseHelper dbHelper;
public LoginDataBaseAdapter(Context _context){
Context context;
context = _context;
dbHelper = new DataBaseHelper(context,DATABASE_NAME,null,DATABASE_VERSION);
}
public LoginDataBaseAdapter open() throws SQLException{
db = dbHelper.getWritableDatabase();
return this;
}
public void close(){
db.close();
}
public SQLiteDatabase getDatabaseInstance(){
return db;
}
public void insertEntry(String userName,String password){
ContentValues newValues = new ContentValues();
newValues.put("USERNAME",userName);
newValues.put("PASSWORD",password);
db.insert("LOGIN",null,newValues);
}
public int deleteEntry(String UserName){
String where = "USERNAME=?";
int numberOFEntriesDeleted;
numberOFEntriesDeleted = db.delete(
"LOGIN",where, new String[]{
UserName}
);
return numberOFEntriesDeleted;
}
public String getSingleEntry(String userName){
Cursor cursor = db.query("LOGIN",null,"USERNAME=?",new String[]{userName},null,null,null);
if(cursor.getCount()<1){
cursor.close();
return "NOT EXIST";
}
cursor.moveToFirst();
String password = cursor.getString(cursor.getColumnIndex("PASSWORD"));
cursor.close();
return password;
}
public void updateEntry(String userName,String password){
ContentValues updatedValues = new ContentValues();
updatedValues.put("USERNAME",userName);
updatedValues.put("PASSWORD",password);
String where = "USERNAME = ?";
db.update("LOGIN",updatedValues,where,new String[]{userName});
}
}
code for DatabaseHelper.java class:
package com.delaroystudios.bus_seat_booking_system;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
/**
* Created by mugenzi israel on 9/19/2017.
*/
public class DataBaseHelper extends SQLiteOpenHelper {
public DataBaseHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version){
super(context,name,factory,version);
}
private static final String TABLE_NAME = "LOGIN";
static final String DATABASE_CREATE = "CREATE TABLE" + TABLE_NAME + "(" + " ID " + " INTEGER PRIMARY KEY AUTOINCREMENT," + " USERNAME text, PASSWORD text );";
#Override
public void onCreate(SQLiteDatabase _db){
_db.execSQL(LoginDataBaseAdapter.DATABASE_CREATE);
}
#Override
public void onUpgrade(SQLiteDatabase _db,int _oldVersion,int _newVersion){
Log.w("TaskDBAdapter","Upgrading from version"+_oldVersion+"to"+_newVersion+
",which will destroy all old data") ;
_db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
onCreate(_db);
}
}
code for Main_activity_login.java class:
package com.delaroystudios.bus_seat_booking_system;
import android.app.Dialog;
import android.content.Intent;
import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.SpinnerAdapter;
import android.widget.TextView;
import android.widget.Toast;
public class Main_activity_login extends AppCompatActivity {
Button login;
Button sign;
LoginDataBaseAdapter loginDataBaseAdapter;
#Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_login);
/* final Button login;
final Button sign;
LoginDataBaseAdapter loginDataBaseAdapter;*/
login = (Button)findViewById(R.id.log);
final Spinner spinner = (Spinner)findViewById(R.id.spinner1);
sign = (Button)findViewById(R.id.sgn);
loginDataBaseAdapter = new LoginDataBaseAdapter(this);
loginDataBaseAdapter = loginDataBaseAdapter.open();
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,R.array.roles_selection,android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long l) {
Toast.makeText(getBaseContext(),parent.getItemAtPosition(position)+ "Selected",Toast.LENGTH_LONG).show();
((TextView) parent.getChildAt(0)).setTextColor(Color.RED);//TO change the color of spinner items
final Intent intent;
switch (position)
{
case 1:
intent = new Intent(Main_activity_login.this,Bus_info_admin.class);
startActivity(intent);
break;
case 2:
intent = new Intent(Main_activity_login.this,pick_ticket.class);
startActivity(intent);
break;
case 3:
intent = new Intent(Main_activity_login.this,SignIn.class);
startActivity(intent);
break;
case 4:
intent = new Intent(Main_activity_login.this,View_Booking.class);
startActivity(intent);
default:
System.out.println("wrong");
}
}
#Override
public void onNothingSelected(AdapterView<?> parent){
}
});
/* login.setOnClickListener(
new View.OnClickListener(){
#Override
public void onClick(View v) {
// code for button one click
Intent intent = new Intent(Main_activity_login.this,DetailsLogin.class); startActivity(intent);
}
}
);*/
sign.setOnClickListener(
new View.OnClickListener(){
#Override
public void onClick(View view){
Intent intent = new Intent(Main_activity_login.this,SignIn.class);
startActivity(intent);
}
}
);
}
public void logIn(View v){
final Dialog dialog = new Dialog(Main_activity_login.this);
dialog.setContentView(R.layout.activity_main_login);//
dialog.setTitle("Login");
final EditText editUserName = (EditText)findViewById(R.id.EditLog);
final EditText editPassword = (EditText)findViewById(R.id.Edit_menu2);
Button btnLogin = (Button)findViewById(R.id.log);
final String userName,password,storedPassword;
userName = editUserName.getText().toString();
password = editPassword.getText().toString();
storedPassword = loginDataBaseAdapter.getSingleEntry(userName);
btnLogin.setOnClickListener(
new View.OnClickListener(){
public void onClick(View v){
if (password.equals(storedPassword)){
Toast.makeText(Main_activity_login.this,"You made it!,Login successful",Toast.LENGTH_LONG).show();
dialog.dismiss();
Intent intent = new Intent(Main_activity_login.this,DetailsLogin.class);
startActivity(intent);
}
else {
Toast.makeText(Main_activity_login.this,"User name or password does not match",Toast.LENGTH_LONG).show();
}
}
}
);
}
#Override
protected void onDestroy(){
super.onDestroy();
loginDataBaseAdapter.close();
}
/*public void startActivity() {
Intent intent = new Intent(Main_activity_login.this,Bus_info_admin.class);
startActivity(intent);
}*/
/*public void buttonLoginClick(View v){
Intent intent = new Intent(v.getContext(),DetailsLogin.class);
v.getContext().startActivity(intent);
}
*/
}
code for SignIn.java:
package com.delaroystudios.bus_seat_booking_system;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class SignIn extends AppCompatActivity { //AppCompatActivity
EditText editUserName,editPassword,editConfirmPassword;
Button btnCreateAccount,btn;
Context context = this;
LoginDataBaseAdapter loginDataBaseAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sign_in);
loginDataBaseAdapter = new LoginDataBaseAdapter(this);
loginDataBaseAdapter = loginDataBaseAdapter.open();
editUserName =(EditText)findViewById(R.id.id_name);
editPassword = (EditText)findViewById(R.id.email);
editConfirmPassword = (EditText)findViewById(R.id.password);
btnCreateAccount = (Button)findViewById(R.id.register) ;
btnCreateAccount.setOnClickListener(
new View.OnClickListener(){
public void onClick(View v){
String userName = editUserName.getText().toString();
String password = editPassword.getText().toString();
String confirmPassword = editConfirmPassword.getText().toString();
if (userName.equals("")||password.equals("")||confirmPassword.equals("")){
Toast.makeText(getApplicationContext(),"Field Vacant",Toast.LENGTH_LONG).show();
return;
}
if (!password.equals(confirmPassword)){
Toast.makeText(getApplicationContext(),"Password does not match",Toast.LENGTH_LONG).show();
return;
}
else {
loginDataBaseAdapter.insertEntry(userName,password);
Toast.makeText(getApplicationContext(),"Account Successfully created",Toast.LENGTH_LONG).show();
Intent i = new Intent(SignIn.this,Main_activity_login.class);
startActivity(i);
finish();
}
}
}
);
/*btn.setOnClickListener(
new View.OnClickListener(){
#Override
public void onClick(View view){
Intent intent = new Intent(SignIn.this,Main_activity_login.class);
startActivity(intent);
}
);*/
}
#Override
protected void onDestroy(){
super.onDestroy();
loginDataBaseAdapter.close();
}
}
code for sign_in.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.delaroystudios.bus_seat_booking_system.SignIn">
<TextView
android:layout_width="match_parent"
android:layout_height="50dp"
android:text="#string/register_here"
android:textSize="32sp"
android:gravity="center"
android:layout_marginTop="30dp"
/>
<EditText
android:layout_marginTop="40dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="#string/user_id"
android:id="#+id/id_user"
/>
<EditText
android:layout_marginTop="30dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="#string/full_name"
android:id="#+id/id_name"
/>
<EditText
android:layout_marginTop="30dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="#string/phone_no"
android:id="#+id/phone"
/>
<EditText
android:id="#+id/email"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="30dp"
android:hint="#string/email_id"
/>
<EditText
android:layout_marginTop="30dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="#string/password"
android:id="#+id/password"
android:layout_marginBottom="20dp"
/>
<Button
android:id="#+id/register"
android:layout_width="150dp"
android:layout_height="50dp"
android:layout_gravity="center"
android:text="#string/register"
android:onClick="onClick"
/>
</LinearLayout>
code for activity_main_login.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
tools:context="com.delaroystudios.bus_seat_booking_system.Main_activity_login"
android:background="#drawable/bus1"
>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:id="#+id/menu1"
android:layout_marginBottom="100dp"
android:layout_marginTop="20dp"
android:gravity="center"
android:layout_marginStart="30dp"
>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/home"
android:textSize="20sp"
android:textColor="#9b59b6"
/>
<Button
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/about"
android:textColor="#9b59b6"
android:textSize="20sp" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/contact"
android:textSize="20sp"
android:textColor="#9b59b6"
/>
<!--a verifier -->
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_below="#+id/menu1"
android:id="#+id/menu2"
android:layout_marginBottom="30dp"
>
<TextView
android:layout_width="150dp"
android:layout_height="wrap_content"
android:text="#string/Login2"
android:textSize="28sp"
android:textColor="#9b59b6"
/>
<EditText
android:id="#+id/EditLog"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="#string/login"
android:textColorHint="#9b59b6"
android:textColor="#ffffff"
/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_below="#+id/menu2"
android:id="#+id/menu3"
android:layout_marginBottom="30dp"
>
<TextView
android:id="#+id/textView"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:text="#string/Pass"
android:textSize="28sp"
android:textColor="#9b59b6"
/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="#string/your_password"
android:id="#+id/Edit_menu2"
android:textColorHint="#9b59b6"
android:textColor="#ffffff"
/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_below="#+id/menu3"
android:layout_marginBottom="10dp"
android:id="#+id/role"
>
<TextView
android:id="#+id/T_role"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:text="#string/role"
android:textSize="28sp"
android:textColor="#9b59b6"
/>
<Spinner
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/spinner1"
/>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:id="#+id/men1"
android:layout_marginTop="70dp"
android:layout_below="#+id/role"
android:gravity="center"
android:layout_marginStart="30dp"
>
<Button
android:id="#+id/log"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:layout_marginEnd="30dp"
android:onClick="logIn"
android:text="#string/login"
android:textColor="#9b59b6"
android:textColorHint="#9b59b6"
android:textSize="20sp"
/>
<Button
android:id="#+id/sgn"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:layout_marginEnd="30dp"
android:onClick="onClick"
android:text="#string/sign_in"
android:textColor="#9b59b6"
android:textColorHint="#9b59b6"
android:textSize="20sp"
/>

In sign_in.xml,
<Button
android:id="#+id/register"
android:layout_width="150dp"
android:layout_height="50dp"
android:layout_gravity="center"
android:text="#string/register"
android:onClick="onClick"
/>
remove android:onClick="onClick" line. That should be work.

How to add strings from editText to a listView

I have a MainActivity with a ListView and an add Button. When the user clicks the add Button it takes you to another activity the CreateActivity for you to enter in data or strings into the editText boxes. After that you click the create Button and it adds the strings to the ListView it shows up, but every time I try to add another item to the ListView it just overrides the first item and doesn't add on to the ListView.
MainActivity.java with listView and add button
package com.example.brian.inventoryapp;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import static android.R.layout.simple_list_item_1;
public class MainActivity extends AppCompatActivity {
Button addButton;
ListView itemListView;
public static ArrayList<String> arrayList;
public static ArrayAdapter arrayAdapter;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Bundle editTextData = getIntent().getExtras();
if(editTextData != null){
itemListView = (ListView)findViewById(R.id.itemListView);
String data = editTextData.getString("data");
arrayList = new ArrayList<String>();
arrayList.add(data);
arrayAdapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, arrayList);
itemListView.setAdapter(arrayAdapter);
if(data != ""){
arrayAdapter.notifyDataSetChanged();
}
}
addButton = (Button) findViewById(R.id.addButton);
addButton.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, CreateActivity.class);
startActivity(intent);
}
});
}
}
activity_main xml with listView and add button
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.example.brian.inventoryapp.MainActivity"
android:weightSum="1">
<Button
android:text="Add"
android:layout_width="wrap_content"
android:layout_height="58dp"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:id="#+id/addButton" />
<ListView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/itemListView"
/>
</RelativeLayout>
CreateActivity.java with four editText boxes and create button
package com.example.brian.inventoryapp;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import static com.example.brian.inventoryapp.R.id.editTextItem;
public class CreateActivity extends AppCompatActivity {
EditText editTextItem;
EditText editTextModel;
EditText editTextSerial;
EditText editTextID;
Button createButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_create);
getIntent();
editTextItem = (EditText)findViewById(R.id.editTextItem);
editTextModel = (EditText)findViewById(R.id.editTextModel);
editTextSerial = (EditText)findViewById(R.id.editTextSerial);
editTextID = (EditText)findViewById(R.id.editTextID);
createButton = (Button) findViewById(R.id.createButton);
createButton.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v) {
String item = "";
item = editTextItem.getText().toString().trim() +
editTextModel.getText().toString().trim() +
editTextSerial.getText().toString().trim() +
editTextID.getText().toString().trim();
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
intent.putExtra("data", item);
startActivity(intent);
}
});
}
}
activity_create xml with the four editText boxes and the create button
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_create"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.example.brian.inventoryapp.CreateActivity">
<TextView
android:text="Item Name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:id="#+id/textView" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:ems="10"
android:layout_below="#+id/textView"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:id="#+id/editTextItem" />
<TextView
android:text="Model Number"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="18dp"
android:id="#+id/textView2"
android:layout_below="#+id/editTextItem"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:ems="10"
android:layout_below="#+id/textView2"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:id="#+id/editTextModel" />
<TextView
android:text="Serial Number"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/editTextModel"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="18dp"
android:id="#+id/textView3" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:ems="10"
android:layout_below="#+id/textView3"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:id="#+id/editTextSerial" />
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:srcCompat="#mipmap/ic_launcher"
android:layout_below="#+id/editTextID"
android:layout_centerHorizontal="true"
android:layout_marginTop="64dp"
android:id="#+id/imageButton" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:ems="10"
android:id="#+id/editTextID"
android:layout_below="#+id/editTextSerial"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="18dp" />
<TextView
android:text="ID Number"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/textView4"
android:layout_below="#+id/editTextSerial"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<Button
android:text="Create"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/createButton"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true" />
</RelativeLayout>

every time you restart the MainActivity, it is be created, the onCreate method was executed .one method you can use the comment method：use startactivityforResult;
you can read this question how to manage startactivityforResult.the second method is to set MainActivity model to SingleInstance.

You are starting MainActivity over and over again, clearing all data previously loaded.
Try this solution
Main activity:
package com.example.brian.inventoryapp;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import static android.R.layout.simple_list_item_1;
public class MainActivity extends AppCompatActivity {
public static final int CREATE_REQUEST = 1;
private Button addButton;
private ListView itemListView;
private ArrayList<String> arrayList;
private ArrayAdapter<String> arrayAdapter;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
itemListView = (ListView) findViewById(R.id.itemListView);
addButton = (Button) findViewById(R.id.addButton);
arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, arrayList);
itemListView.setAdapter(arrayAdapter);
addButton = (Button) findViewById(R.id.addButton);
addButton.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, CreateActivity.class);
startActivityForResult(intent, CREATE_REQUEST);
}
});
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CREATE_REQUEST) {
if (resultCode == RESULT_OK) {
String item = data.getStringExtra("data");
arrayList.add(item);
arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, arrayList);
itemListView.setAdapter(arrayAdapter);
}
}
}
}
In your CreateActivity change createButton listener to this one:
createButton.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v) {
String item = "";
item = editTextItem.getText().toString().trim() +
editTextModel.getText().toString().trim() +
editTextSerial.getText().toString().trim() +
editTextID.getText().toString().trim();
Intent intent = new Intent();
intent.putExtra("data", item);
setResult(RESULT_OK, intent);
finish();
}
});

Yes it will assume as if the MainActivity is started for the first time so you should use startActivityForResult() method instead of startActivity().This will continue your MainActivity and do not override your list View.

onActivityResult in fragment doesn't update edittext

I have a sample barcode scanner app using this library.
onActivityResult does not update the textView nor editText.
I did some search around and noticed that this is a common problem.
onActivityResult i get my value that i pass through, i can log and toast the value but does not work on setText() method.
Edit: I'm using fragments.
Fragment A is where the button, edit & textview are, Fragment B is the barcode scanner and i use popBackStack() to return to fragment A(received data from Fragment B);
Here is my code:
package com.gilbert.apptastic.barcodefragment;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
public static final int DIALOG_FRAGMENT = 1;
public TextView textView;
public TextView textView2;
public TextView textView3;
public TextView textView4;
public EditText editText;
public Button button;
public String barcode;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
textView = (TextView)rootView.findViewById(R.id.textView);
textView2 = (TextView)rootView.findViewById(R.id.textView2);
textView3 = (TextView)rootView.findViewById(R.id.textView3);
textView4 = (TextView)rootView.findViewById(R.id.textView4);
editText = (EditText)rootView.findViewById(R.id.editText);
button = (Button)rootView.findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
scanBarcode();
}
});
// setText();
return rootView;
}
#Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if(requestCode == DIALOG_FRAGMENT && resultCode == Activity.RESULT_OK) {
// System.out.println("ok");
barcode = data.getExtras().getString("barcode");
// edit_barcode.setText(value);
setText();
Toast.makeText(getActivity(), barcode, Toast.LENGTH_SHORT).show();
// System.out.println(barcode);
// edit_barcode.setText(barcode);
}
}
public void setText() {
System.out.println(barcode);
textView.setText(barcode);
textView2.setText(barcode);
textView3.setText(barcode);
textView4.setText(barcode);
editText.setText(barcode);
}
public void scanBarcode(){
Barcode barcode = new Barcode();
barcode.setTargetFragment(PlaceholderFragment.this, DIALOG_FRAGMENT);
FragmentTransaction fragmentTransaction =
getActivity().getFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.container, barcode);
fragmentTransaction.addToBackStack("VIEW");
fragmentTransaction.commit();
}
}
Barcode Class:
package com.gilbert.apptastic.barcodefragment;
import android.app.Activity;
import android.app.Fragment;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import me.dm7.barcodescanner.zbar.Result;
import me.dm7.barcodescanner.zbar.ZBarScannerView;
public class Barcode extends Fragment implements ZBarScannerView.ResultHandler {
private ZBarScannerView mScannerView;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
mScannerView = new ZBarScannerView(getActivity());
return mScannerView;
}
#Override
public void onResume() {
super.onResume();
mScannerView.setResultHandler(this);
mScannerView.startCamera();
}
#Override
public void handleResult(Result rawResult) {
if(!rawResult.getContents().isEmpty()){
mScannerView.startCamera();
// Toast.makeText(getActivity(),"Success",Toast.LENGTH_SHORT).show();
Intent intent = new Intent();
intent.putExtra("barcode", rawResult.getContents());
getTargetFragment().onActivityResult(getTargetRequestCode(), Activity.RESULT_OK, intent);
getFragmentManager().popBackStack();
}else {
// Toast.makeText(getActivity(),"Fail",Toast.LENGTH_SHORT).show();
getFragmentManager().popBackStack();
mScannerView.startCamera();
}
}
#Override
public void onPause() {
super.onPause();
mScannerView.stopCamera();
}
}
my layout file:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
tools:context=".MainActivity$PlaceholderFragment">
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Scan"
android:id="#+id/button"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true" />
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_above="#+id/button">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Text"
android:id="#+id/textView"
android:layout_gravity="center_horizontal" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Large Text"
android:id="#+id/textView2"
android:layout_gravity="center_horizontal" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Medium Text"
android:id="#+id/textView3"
android:layout_gravity="center_horizontal" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="Small Text"
android:id="#+id/textView4"
android:layout_gravity="center_horizontal" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/editText"
android:hint="Barcode"
android:layout_gravity="center_horizontal" />
</LinearLayout>
</RelativeLayout>

Try these
1 ) Instead of
barcode = data.getExtras
try
barcode = data.getStringExtra("barcode")
2) Instead of initiating barcode
String barcode;
Try doing this in your onActivityResult,
String barcode = data.getExtras().getString("barcode");
3 ) Instead of putting data directly into intent, use a bundle.
Bundle b = new Bundle();
b.putString ("barcode", rawResult.getContent());
Intent i = new intent();
i.putExtras (b);
In your onActivityResult
Bundle b = getIntent.getExtras();
String s = b.getString("barcode");
Then use s where you need it.

Button click force closes the activity

My problem is when I click bSA button I encounter error and the activity closes.
java.lang.runtimeexception unable to start activity componentinfo ...
here is my code
Data.java :
package com.example.myapp;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class Data extends Activity implements View.OnClickListener {
Button start, startFor;
EditText sendET;
TextView gotAnswer;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.get);
initialize();
}
private void initialize() {
start = (Button) findViewById(R.id.bSA);
startFor = (Button) findViewById(R.id.bSAFR);
sendET = (EditText) findViewById(R.id.etSend);
gotAnswer = (TextView) findViewById(R.id.tvGot);
start.setOnClickListener(this);
startFor.setOnClickListener(this);
}
#Override
public void onClick(View view) {
switch (view.getId()){
case R.id.bSA:
String bread = sendET.getText().toString();
Bundle basket = new Bundle();
basket.putString("key", bread);
Intent a = new Intent(getApplicationContext(), OpenedClass.class);
a.putExtras(a);
startActivity(a);
break;
case R.id.bSAFR:
break;
}
}
}
get.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/etSend" android:layout_gravity="center_horizontal"/>
<Button
android:layout_below="#+id/etSend"
android:layout_alignParentRight="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Start Activity"
android:id="#+id/bSA"/>
<Button
android:layout_toLeftOf="#+id/bSA"
android:layout_alignTop="#+id/bSA"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Start Activity for Results"
android:id="#+id/bSAFR"/>
<TextView
android:layout_below="#+id/bSAFR"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView"
android:id="#+id/tvGot"/>
</RelativeLayout>
=============================================================
OpenedClass.java
package com.example.myapp;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RadioGroup;
import android.widget.TextView;
public class OpenedClass extends Activity implements View.OnClickListener, RadioGroup.OnCheckedChangeListener {
TextView question, test;
Button returnData;
RadioGroup selectionList;
String gotBread;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.send);
initialize();
Bundle gotBasket = getIntent().getExtras();
gotBread = gotBasket.getString("key");
question.setText(gotBread);
}
private void initialize() {
question = (TextView) findViewById(R.id.tvQuestion);
test = (TextView) findViewById(R.id.tvText);
returnData = (Button) findViewById(R.id.bReturn);
returnData.setOnClickListener(this);
selectionList = (RadioGroup) findViewById(R.id.rgAnswers);
selectionList.setOnCheckedChangeListener(this);
}
#Override
public void onClick(View view) {
}
#Override
public void onCheckedChanged(RadioGroup arg0, int arg1) {
// TODO Auto-generated method stub
switch (arg1) {
case R.id.rCrazy:
break;
case R.id.rFun:
break;
case R.id.rBoth:
break;
}
}
}
send.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="Hosein is ..."
android:id="#+id/tvQuestion"/>
<RadioGroup
android:id="#+id/rgAnswers"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Crazy"
android:id="#+id/rCrazy"
/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Super Fun"
android:id="#+id/rFun"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Both"
android:id="#+id/rBoth"/>
</RadioGroup>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Return"
android:id="#+id/bReturn"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Text"
android:id="#+id/tvText"/>
</LinearLayout>

Intent a = new Intent(getApplicationContext(), OpenedClass.class);
a.putExtras(a);
You cannot put a inside itself. This causes infinite recursion and stack overflow.
You probably wanted
a.putExtras(basket);