Develop Reference

EditText autoscroll doesn't work after showing dialog

I'm developing an app for users to share their books. To achieve this, I'm getting different data about the book from the user. The problem is, horizontal autoscrolling of all EditTexts are working until Dialog has been shown and dismissed. Once a dialog has been dismissed on the fragment, horizontal autoscrolling of the EditText's on this layout won't work.
I added:
android:focusable="true"
android:focusableInTouchMode="true"
to parent layout of the edittext but doesn't work.
Also to make sure that autoscrolling is enabled I've added:
android:scrollHorizontally="true"
But none of above helped.
Here is XML code of the fragment layout.
<?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:background="#color/white"
android:orientation="vertical"
android:paddingStart="#dimen/dp25"
android:paddingEnd="#dimen/dp25"
tools:context=".UI.Fragments.SharePostFragments.Fragment1.OverViewFragment">
<LinearLayout
android:id="#+id/root_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:focusable="true"
android:focusableInTouchMode="true"
android:orientation="vertical">
<EditText
android:id="#+id/edit_text_name_of_book"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:fontFamily="#font/segoe_ui_semi_bold"
android:hint="#string/name_of_book"
android:inputType="text"
android:maxLength="50"
android:maxLines="1"
android:scrollHorizontally="true"
android:textAlignment="textStart"
android:textColor="#color/colorPrimaryDark"
android:textColorHint="#color/colorPrimaryDark"
android:textSize="#dimen/font22" />
<TextView
android:id="#+id/text_view_number_of_characters"
android:layout_width="50dp"
android:layout_height="wrap_content"
android:layout_gravity="end"
android:layout_marginEnd="#dimen/dp10"
android:fontFamily="#font/segoe_ui_light"
android:text="#string/_0_50"
android:textColor="#color/colorAccent"
android:textSize="#dimen/font16"
tools:ignore="RtlSymmetry" />
<EditText
android:id="#+id/edit_text_name_of_author"
android:layout_width="match_parent"
android:layout_height="#dimen/textBoxHeight"
android:layout_marginTop="#dimen/dp30"
android:background="#drawable/round_text_box_gray"
android:fontFamily="#font/segoe_ui_regular"
android:hint="#string/name_of_writer"
android:inputType="text"
android:paddingStart="20dp"
android:paddingEnd="20dp"
android:textColor="#color/colorPrimaryDark"
android:textColorHint="#color/colorPrimaryDark"
android:textSize="#dimen/font16" />
<RelativeLayout
android:id="#+id/constraint_layout_1"
android:layout_width="match_parent"
android:layout_height="#dimen/textBoxHeight"
android:layout_marginTop="#dimen/dp20"
android:background="#drawable/round_text_box_border_gray"
android:gravity="center_vertical"
android:orientation="horizontal">
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_marginTop="3dp"
android:fontFamily="#font/segoe_ui_regular"
android:paddingStart="#dimen/dp20"
android:paddingEnd="#dimen/dp20"
android:text="#string/price_of_book"
android:textColor="#color/colorPrimaryDark"
android:textSize="#dimen/font16" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:paddingStart="#dimen/dp20"
android:paddingEnd="#dimen/dp20"
android:text="#string/azn_sign"
android:textColor="#color/colorPrimaryDark"
android:textSize="#dimen/font16" />
<EditText
android:id="#+id/edit_text_price_of_book"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toStartOf="#+id/textView2"
android:background="#color/white"
android:clickable="false"
android:hint="#string/_0_0"
android:inputType="text|numberDecimal"
android:maxLength="6"
android:singleLine="true"
android:textColorHint="#android:color/black" />
</RelativeLayout>
<LinearLayout
android:id="#+id/constraint_layout_conditions_root"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="#dimen/dp20"
android:background="#drawable/round_text_box_border_gray"
android:orientation="horizontal">
<LinearLayout
android:id="#+id/linear_layout_1"
android:layout_width="match_parent"
android:layout_height="#dimen/textBoxHeight"
android:orientation="horizontal">
<TextView
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="9"
android:gravity="center_vertical"
android:paddingStart="#dimen/dp20"
android:paddingEnd="#dimen/dp20"
android:text="#string/book_condition_placeholder"
android:textColor="#color/colorPrimaryDark" />
<ImageButton
android:id="#+id/image_button_conditions"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginEnd="#dimen/dp10"
android:layout_weight="1"
android:background="?attr/selectableItemBackgroundBorderless"
android:src="#drawable/ic_spinner" />
</LinearLayout>
<LinearLayout
android:id="#+id/linear_layout_conditions"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:visibility="gone">
<TextView
android:id="#+id/text_view_new"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingStart="#dimen/dp20"
android:paddingTop="#dimen/dp10"
android:paddingEnd="#dimen/dp20"
android:paddingBottom="#dimen/dp10"
android:text="#string/_new"
android:textColor="#color/dark_gray_text_color" />
<TextView
android:id="#+id/text_view_normal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingStart="#dimen/dp20"
android:paddingTop="#dimen/dp10"
android:paddingEnd="#dimen/dp20"
android:paddingBottom="#dimen/dp10"
android:text="#string/normal"
android:textColor="#color/dark_gray_text_color" />
<TextView
android:id="#+id/text_view_old"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingStart="#dimen/dp20"
android:paddingTop="#dimen/dp10"
android:paddingEnd="#dimen/dp20"
android:paddingBottom="#dimen/dp10"
android:text="#string/old"
android:textColor="#color/dark_gray_text_color" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:id="#+id/constraint_layout_languages_root"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="#dimen/dp20"
android:background="#drawable/round_text_box_border_gray"
android:orientation="horizontal">
<LinearLayout
android:id="#+id/linear_layout_2"
android:layout_width="match_parent"
android:layout_height="#dimen/textBoxHeight"
android:orientation="horizontal">
<TextView
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="9"
android:gravity="center_vertical"
android:paddingStart="#dimen/dp20"
android:paddingEnd="#dimen/dp20"
android:text="#string/language"
android:textColor="#color/colorPrimaryDark" />
<ImageButton
android:id="#+id/image_button_languages"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginEnd="#dimen/dp10"
android:layout_weight="1"
android:background="?attr/selectableItemBackgroundBorderless"
android:src="#drawable/ic_spinner" />
</LinearLayout>
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recycler_view_languages"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingStart="#dimen/dp20"
android:paddingEnd="#dimen/dp20"
android:paddingBottom="#dimen/dp10"
android:visibility="gone" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
Fragment Java code:
package org.kitapp.UI.Fragments.SharePostFragments.Fragment1;
import android.annotation.SuppressLint;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
import androidx.constraintlayout.widget.ConstraintLayout;
import androidx.fragment.app.Fragment;
import org.kitapp.R;
import org.kitapp.UI.Dialogs.ConditionDialog.ConditionOfBookDialog;
import org.kitapp.UI.Dialogs.LanguageDialog.LanguageDialog;
import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;
import butterknife.OnTextChanged;
public class OverViewFragment extends Fragment implements OverViewContractor.View {
private final String TAG = OverViewFragment.class.getSimpleName();
private Context mContext;
private OverViewCallback mListener;
private OverViewPresenter mPresenter;
#BindView(R.id.constraint_layout_conditions_root)
LinearLayout conditionRoot;
#BindView(R.id.constraint_layout_languages_root)
LinearLayout languagesRoot;
#BindView(R.id.linear_layout_conditions)
LinearLayout conditions;
#BindView(R.id.root_layout)
LinearLayout rootLayout;
#BindView(R.id.text_view_number_of_characters)
TextView numberOfChars;
#BindView(R.id.edit_text_name_of_book)
EditText nameOfBook;
public interface OverViewCallback {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_over_view, container, false);
ButterKnife.bind(this, view);
new OverViewPresenter(this);
//rootLayout.getLayoutTransition().enableTransitionType(LayoutTransition.CHANGING);
return view;
}
////// CONTRACTOR METHODS //////
#Override
public void setPresenter(OverViewPresenter presenter) {
this.mPresenter = presenter;
}
////// LISTENERS //////
#Override
#OnClick(R.id.image_button_conditions)
public void showConds() {
ConditionOfBookDialog conditionOfBookDialog = new ConditionOfBookDialog(mContext);
conditionOfBookDialog.show();
}
#Override
#OnClick(R.id.image_button_languages)
public void showLangs() {
LanguageDialog languageDialog = new LanguageDialog(mContext);
languageDialog.show();
}
#Override
#SuppressLint("SetTextI18n")
#OnTextChanged(R.id.edit_text_name_of_book)
public void onNameOfBookChange() {
int len = nameOfBook.getText().toString().trim().length();
numberOfChars.setText(len + "/50");
if (len > 50) {
nameOfBook.setText(nameOfBook.getText().toString().substring(0, 50));
nameOfBook.setSelection(nameOfBook.getText().length());
}
}
////// FRAGMENT METHODS //////
#Override
public void onAttach(Context context) {
super.onAttach(context);
this.mContext = context;
if (context instanceof OverViewCallback) {
mListener = (OverViewCallback) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OverViewCallback");
}
}
#Override
public void onDetach() {
super.onDetach();
mListener = null;
}
}
UI Design and Dialog
In the image above, there are EditTexts Name Of Book and Name of Author. Before showing a dialog, both of them work like a charm. When writing something, the cursor automatically scrolls to the end. Once Dialog has been shown and dismissed, none of them works properly, and the cursor stays at the end of the EditText but still the characters are being written continues in the hidden part.
In this UI it cannot be seen because of the issue, but I've written.
Roses are red, violets are blue, Stackoverflow I love u
But only Roses are red, violets are blue, Stac can be seen.
Weird buggy layout UI image
Please, help me to solve this problem. Thanks in advance.

As a solution, I don't know the underlying reason, but the problem solved once I removed Butterknife library from my project.

choosing from an integer arraylist

Working in Android studio and as part of a bigger app. I will have an ArrayList of Integers and want to send this to a new instance/screen where each integer in the list displays a string description from which the user can pick whatever entry they want. Once they click it, I want the new instance to send back the integer corresponding to the position in the array of their choice so that I can use it for the next operation.
I made this program as a stand-alone just to get this operation down, but it fails to work (ListChooser has stopped working on load)
my MainActivity.java:
package com.example.kenn.listchooser;
import java.util.ArrayList;
import java.util.List;
import android.content.Intent;
import android.hardware.camera2.TotalCaptureResult;
import android.os.Bundle;
import android.os.Parcelable;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.app.ListActivity;
public class MainActivity extends ListActivity {
private static final String TOTAL_COUNT = "total_count";
public ArrayList<Integer> listValues;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listValues= new ArrayList<Integer>();
listValues.add(1);
listValues.add(2);
listValues.add(4);
listValues.add(5);
}
public int randomMe(View view) {
Intent randomIntent = new Intent(this, Chooser.class);
randomIntent.putExtra(TOTAL_COUNT, listValues);
startActivity(randomIntent);
int pick=getIntent().getIntExtra (TOTAL_COUNT, 2);
return pick;
}
public void action(View view) {
TextView showCountTextView = (TextView) findViewById(R.id.textViewA);
showCountTextView.setText(Integer.toString(this.randomMe(view)));
} }
my Chooser.java:
package com.example.kenn.listchooser;
import ...
public class Chooser extends ListActivity{
private String TOTAL_COUNT = "total_count";
private TextView text;
private ArrayList<Integer> listHere;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.chooser);
List<Integer> def = new ArrayList<Integer>();
listHere=getIntent().getIntegerArrayListExtra(TOTAL_COUNT);
text = (TextView) findViewById(R.id.mainText);
// initiate the listadapter
ArrayAdapter<Integer> myAdapter = new ArrayAdapter <Integer>(this,
R.layout.row_layout, R.id.listText, listHere);
// assign the list adapter
setListAdapter(myAdapter);
}
// when an item of the list is clicked
#Override
protected void onListItemClick(ListView list, View view, int position, long id) {
super.onListItemClick(list, view, position, id);
String selectedItem = (String) getListView().getItemAtPosition(position);
Intent randomIntent = new Intent(this, com.example.kenn.listchooser.MainActivity.class);
randomIntent.putExtra(TOTAL_COUNT, selectedItem);
} }
my activity main.xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
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:background="#color/colorPrimary"
tools:context=".MainActivity">
<Button
android:id="#+id/random_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="24dp"
android:layout_marginTop="8dp"
android:background="#color/colorPrimaryDark"
android:onClick="action"
android:text="Choose"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent" />
<TextView
android:id="#+id/textViewA"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:text="Alert Dialog"
android:textSize="35dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
</android.support.constraint.ConstraintLayout>
my chooser.xml:
<?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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/mainText"
android:text="My list" />
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/mainText"
android:id="#android:id/list"
android:background="#aaaaaa" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/mainText"
android:id="#android:id/empty"
android:text="There is no data"
android:textStyle="bold" />
</RelativeLayout>
my row_layout.xml:
<?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" >
<TextView
android:id="#+id/listText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:textSize="18sp"
android:textStyle="bold"
android:textColor="#ff00ff" />
</LinearLayout>

Animation Problems in Android

I've got few problems in using animation in android studios:
I'm trying to translate certain images at an angle. Like in the image below I want to move that attachment pin like icons to all the ends of the corner. How can I do this?
I was trying to scale up the image of the gear image in the center every time its tapped and scale down when tapped again. However, the image starts losing its quality. How can I prevent the quality from getting deteriorated?
Here's the code:
MainActivity.java
package com.rootonelabs.vicky.pulse;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.animation.LinearInterpolator;
import android.widget.Button;
import android.widget.ImageView;
import com.gigamole.library.PulseView;
public class MainActivity extends AppCompatActivity {
PulseView pulseView;
Button btnStart, btnStop;
ImageView gear;
ImageView icon1,icon2,icon3,icon4,icon5,icon6;
int chkClick = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
pulseView = (PulseView)findViewById(R.id.pv);
btnStart = (Button)findViewById(R.id.btnStart);
btnStop = (Button)findViewById(R.id.btnStop);
btnStart.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
pulseView.startPulse();
}
});
btnStop.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
pulseView.finishPulse();
}
});
gear = (ImageView)findViewById(R.id.gear);
gear.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
gear.animate().scaleX(1.5f).scaleY(1.5f).setDuration(500);
animateDiagonalPan();
icon1 = findViewById(R.id.icon1);
icon1.animate().translationXBy(120).translationYBy(120).setDuration(500);
if(chkClick==0)
{
pulseView.animate().alpha(0).setDuration(500);
gear.animate().scaleX(1.5f).scaleY(1.5f).setDuration(500);
pulseView.finishPulse();
chkClick = 1;
}else{
pulseView.animate().alpha(1f).setDuration(500);
gear.animate().scaleX(1f).scaleY(1f).setDuration(500);
pulseView.startPulse();
chkClick = 0;
}
}
});
}
}
activity_main.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:background="#f39c12"
tools:context="com.rootonelabs.vicky.pulse.MainActivity">
<LinearLayout
android:orientation="horizontal"
android:layout_alignParentBottom="true"
android:weightSum="2"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="#+id/btnStart"
android:layout_weight="1"
android:text="START"
android:layout_width="0dp"
android:layout_height="wrap_content" />
<Button
android:id="#+id/btnStop"
android:layout_weight="1"
android:text="STOP"
android:layout_width="0dp"
android:layout_height="wrap_content" />
</LinearLayout>
<ImageView
android:id="#+id/gear"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:src="#drawable/men3"/>
<ImageView
android:id="#+id/icon1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:src="#drawable/ic_action_video"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:src="#drawable/ic_action_archive"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:src="#drawable/ic_attachment_black_24dp"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:src="#drawable/ic_action_video"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:src="#drawable/ic_action_archive"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:src="#drawable/ic_attachment_black_24dp"/>
<com.gigamole.library.PulseView
android:id="#+id/pv"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
app:pv_alpha="70"
app:pv_color="#FFF"
app:pv_icon="#drawable/men2"
app:pv_icon_width="100dp"
app:pv_icon_height="100dp"
app:pv_interpolator="#android:anim/linear_interpolator"
app:pv_measure="height"
app:pv_spawn_period="1000" />
</RelativeLayout>

Method is missing or has incorrect signature

I am making a simple app in which context view changes and then a toast message is displayed as input given by user. I don't understand why the app keeps on crashing when changing the context view.
Also Android studio gives this warning:
Method "Toaster" is missing in "FirstActivity" or has incorrect signature.
Here is my code:
activity_me_clicked.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="#string/welcome"
android:textSize="36sp" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:paddingLeft="7dp"
android:paddingRight="7dp"
android:text="#string/intro"
android:textSize="24sp" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:baselineAligned="false">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="vertical">
<EditText
android:id="#+id/name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="7dp"
android:layout_marginEnd="7dp"
android:layout_marginTop="10dp"
android:ems="10"
android:hint="Name"
android:inputType="textPersonName"
tools:ignore="HardcodedText" />
<Button
android:id="#+id/named"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:paddingBottom="10dp"
android:paddingTop="10dp"
android:onClick="MainProcess"
android:text="#string/done" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="horizontal"
tools:ignore="UselessLeaf"></LinearLayout>
</LinearLayout>
</LinearLayout>
FirstActivity.Java:
package com.example.nautatvanavlakha.abcd;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
public class FirstActivity extends AppCompatActivity {
public static String owner_string;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_me_clicked);
}
public void MainProcess(View view) {
final String TAG="DEBUG";
Log.d(TAG,"At least process started");
EditText owner = (EditText) findViewById(R.id.name);
owner_string = owner.getText().toString();
Log.d(TAG,"owner name stored");
TextView textView = (TextView) findViewById(R.id.welcome);
textView.setText("Hi " + owner_string + ".");
Log.d(TAG,"owner name is set");
setContentView(R.layout.activity_main_screen);
Log.d(TAG,"content shown");
}
}
activity_main_screen.xml:
<?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">
<TextView
android:id="#+id/welcome"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
android:id="#+id/textView4"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/what_would_you_like_me_to_do_today"
android:textSize="18sp" />
<Button
android:id="#+id/Cam"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
android:padding="0dp"
android:paddingTop="15dp"
android:text="#string/camera" />
<Button
android:id="#+id/Mus"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
android:padding="0dp"
android:paddingTop="15dp"
android:text="#string/music" />
<Button
android:id="#+id/QR"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
android:padding="0dp"
android:paddingTop="15dp"
android:text="#string/scanQR" />
<EditText
android:id="#+id/toastText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:hint="#string/order"
android:inputType="textPersonName" />
<Button
android:id="#+id/toaster"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
android:onClick="toaster"
android:padding="0dp"
android:paddingTop="15dp"
android:text="#string/toast"
android:layout_marginEnd="100dp"
android:layout_gravity="center"/>
</LinearLayout>
MainScreen.java:
package com.example.nautatvanavlakha.abcd;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
public class MainScreen extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_screen);
}
public void toaster(View view){
EditText toast = (EditText)findViewById(R.id.toastText);
String final_toast = toast.getText().toString();
Toast.makeText(getApplicationContext(), final_toast, Toast.LENGTH_SHORT).show();
}
}
EDIT: As suggested, I moved the toaser function to FirstActivity.Java and deleted the MainScreen.java file as it becomes pointless to keep it. But the major problem is when I press the button (id named) the app keeps stopping.
EDIT2: I found that setContentView(R.layout.activity_main_screen) in FirstActivity.Java needs to be above this code
TextView textView = (TextView) findViewById(R.id.welcome);
textView.setText("Hi " + owner_string + ".");
Log.d(TAG,"owner name is set");
so that Activity has access to all the layout components. Thanks solved :)

You replaced the content view in the first activity with a layout that include the onClick attribute, but you have no public void toaster(View view) method there.
So, either don't use setContentView a second time, or implement that method on both Activities.
The recommended way to replace the view is Fragments, by the way

This is a wrong way to change the contents of your Activity, The main problem here is that you have onClick attribute set to "toaster", And you don't have a function called "toaster" in your FirstActivity.
Beside that, The MainScreen Activity in your code will never be used.
So, Your problem is that you set the FirstActivity contents to "activity_main_screen.xml", And FirstActivity doesn't have "toaster" method in it, When you change the context, the Activity will try to find toaster method and the app will crash because the method doesn't exist in FirstActivity.
You can solve this problem by making a method called "toaster" inside FirstActivity, But
This is a very bad practice, You can use Fragments instead, Or you can use Intent to move to another activity.
Some useful links about Fragments:
https://developer.android.com/guide/components/fragments.html
https://www.tutorialspoint.com/android/android_fragments.htm
https://examples.javacodegeeks.com/android/core/app/fragment/android-fragments-example/
Why should I use fragment in Android?

How to lock one Response after hitting submit button in making Quiz App

I am making a Quiz app where I have created 2 buttons ,one for submit and other to move to next Question
I Want to code it in such a way that if I hit Submit button the response gets recorded and doesn't change after it:
My XML Code:
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
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" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.vidit.project3.question1">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/q1"
android:textAlignment="center"
android:layout_marginTop="10dp"
android:layout_centerHorizontal="true"
android:textSize="20dp"
android:id="#+id/tv"
/>
<RadioGroup
android:layout_marginTop="20dp"
android:layout_below="#+id/tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:layout_marginLeft="100dp"
android:orientation="vertical"
android:id="#+id/rg">
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/a1" />
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/a2" />
<RadioButton
android:id="#+id/correct"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/a3" />
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/a4"
android:id="#+id/last" />
</RadioGroup>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:layout_below="#+id/rg"
android:id="#+id/submit"
android:text="SUBMIT"
android:layout_marginTop="20dp"
android:onClick="submit1"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/submit"
android:layout_centerHorizontal="true"
android:layout_marginTop="20dp"
android:text="NEXT"
android:onClick="toQuestion2"/>
</RelativeLayout>
</ScrollView>
Java Code:
package com.example.vidit.project3;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.RadioButton;
import android.widget.Toast;
public class question1 extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_question1);
}
public void submit1(View v)
{
RadioButton rb= (RadioButton) findViewById(R.id.correct);
if(rb.isChecked())
{
Toast toast = Toast.makeText(getApplicationContext(),"Whopiee! Correct Answer",Toast.LENGTH_LONG);
toast.show();
}
else
{
Toast toast = Toast.makeText(getApplicationContext(),"Arghh! Incorrect Answer",Toast.LENGTH_LONG);
toast.show();
}
}
public void toQuestion2(View v)
{
Intent intent = new Intent(this,question2.class);
startActivity(intent);
}
}

You can achieve this by storing the response of answer in Map and need to be check in the map if the Question exists , then disable the options otherwise open the options.
Map<Question,Response> quizResponse = new HashMap();
Now add your all questions one by one in this Map and check
if(quizResponse.contains(question))
{ radioGroup.getChildAt(i).setEnabled(false); // Disable the button
}
else
{
// show the question
quizResponse.put(question, response); // this response can be blank and update once you got user response
}

This will disable all the radio buttons. Is that what you want?
for (int i = 0; i < radioGroup.getChildCount(); i++)
{
radioGroup.getChildAt(i).setEnabled(false);
}