Develop Reference

Android app keeps stopping while building using android studio

When I'm trying to transfer data between activities, I can't get my message and the app keeps crashing,
It show me 'app keeps stopping'
Code in MainActivity.java
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends AppCompatActivity {
Intent outIntent;
EditText edtPhone;
EditText edtMessage;
Button btnNext;
String tempText="";
public static final String PHONE = "PHONE";
public static final String MESSAGE = "MESSAGE";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnNext = (Button) findViewById(R.id.btnNext);
btnNext.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View V) {
outIntent = new Intent(MainActivity.this, ActivityTwo.class);
edtPhone = (EditText) findViewById(R.id.edtPhone);
edtMessage = (EditText) findViewById(R.id.edtMessage);
tempText = edtPhone.getText().toString();
outIntent.putExtra(PHONE,tempText);
tempText = edtMessage.getText().toString();
outIntent.putExtra(MESSAGE,tempText);
startActivity(outIntent);
}
});
}
public void closeMethod(View view) {
finish();
}
}
ActivityTwo.java
package com.example.fir;
import android.content.Intent;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import android.widget.TextView;
public class ActivityTwo extends AppCompatActivity {
Intent incomingIntent;
TextView txtPhone;
TextView txtMessage;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_two);
incomingIntent = getIntent();
txtPhone = (TextView) findViewById(R.id.txtPhone);
txtMessage = (TextView) findViewById(R.id.txtMessage);
txtPhone.setText(incomingIntent.getStringExtra(MainActivity.PHONE));
txtMessage.setText(incomingIntent.getStringExtra(MainActivity.MESSAGE));
}
}
Activitymain.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=".MainActivity" >
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginTop="32dp"
android:text="Phone" />
<EditText
android:id="#+id/editTextPhone"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginStart="0dp"
android:layout_marginTop="60dp"
android:ems="10"
android:hint="Phone"
android:inputType="phone"
android:minHeight="48dp" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginTop="124dp"
android:text="Message" />
<EditText
android:id="#+id/editTextTextPersonName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_alignParentEnd="true"
android:layout_centerHorizontal="true"
android:layout_marginStart="0dp"
android:layout_marginTop="156dp"
android:layout_marginEnd="3dp"
android:ems="10"
android:hint="Message"
android:inputType=""
android:minHeight="48dp" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginTop="224dp"
android:orientation="horizontal">
<Button
android:id="#+id/btnNext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Next" />
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="closeMethod"
android:text="CLose" />
</LinearLayout>
</RelativeLayout>
Activitytwo.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=".MainActivity" >
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginTop="32dp"
android:text="Phone" />
<EditText
android:id="#+id/editTextPhone"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginStart="0dp"
android:layout_marginTop="60dp"
android:ems="10"
android:hint="Phone"
android:inputType="phone"
android:minHeight="48dp" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginTop="124dp"
android:text="Message" />
<EditText
android:id="#+id/editTextTextPersonName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_alignParentEnd="true"
android:layout_centerHorizontal="true"
android:layout_marginStart="0dp"
android:layout_marginTop="156dp"
android:layout_marginEnd="3dp"
android:ems="10"
android:hint="Message"
android:inputType=""
android:minHeight="48dp" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginTop="224dp"
android:orientation="horizontal">
<Button
android:id="#+id/btnNext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Next" />
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="closeMethod"
android:text="CLose" />
</LinearLayout>
</RelativeLayout>
The issue is when I don't put any value into the firstEditText or secondEditText or both of them and click on any button then the app crashes and a pop up shows "myapp keeps stopping".
I cannot get the text and am unsure of why the app keeps crashing.

you have defined your Edit texts in the first activity with id's named
edtPhone
edtMessage
but there was no edtPhone or edtMessage in your xml.
this issue also repeats in your second activity
you have defined txtPhone and txtMessage
but again there are no such ids in your second activity XML.
keep in mind that these might not be the whole problem as you didn't post any log for the errors. but if there were anything else, ask and we'll help you

How to fix this margin gap?

I am creating an Faq page using TextViews, So the textviews become visible and hide automatically when clicked, but this was overlapping the upcoming question so I researched and found marginlayoutparams solution but this code won't reset back when clicked again.
Initial state:
After I click Fare Charges:
After I click on it again:
The code:
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class faq extends AppCompatActivity {
TextView mfaq,mAns,mfaq2,mAns2;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_faq);
mfaq=findViewById(R.id.faq1);
mAns=findViewById(R.id.ans);
mfaq2=findViewById(R.id.faq2);
mAns2=findViewById(R.id.ans2);
mfaq.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if(mAns.getVisibility()== View.VISIBLE){
ViewGroup.MarginLayoutParams marginParams = (ViewGroup.MarginLayoutParams) mfaq2.getLayoutParams();
marginParams.setMargins(marginParams.leftMargin,
-400, //setting it back to 0 this part isnt working
marginParams.rightMargin,
marginParams.bottomMargin);
mAns.setVisibility(View.GONE);
}
else
mAns.setVisibility(View.VISIBLE);
ViewGroup.MarginLayoutParams marginParams = (ViewGroup.MarginLayoutParams) mfaq2.getLayoutParams();
marginParams.setMargins(marginParams.leftMargin,
400, //only changing top margin
marginParams.rightMargin,
marginParams.bottomMargin);
}
});
mfaq2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if(mAns2.getVisibility()== View.VISIBLE){
mAns2.setVisibility(View.GONE);
}
else
mAns2.setVisibility(View.VISIBLE);
}
});
}
}
I don't know how to set it back to initial state like first image. Please help. Note- I am a beginner so please explain me so I can learn and understand.

Can you print the xml ? try with "wrap_content" in parent layout

You can use Cardview to encapsulate your Faq element :
https://developer.android.com/guide/topics/ui/layout/cardview
Then change the visibility of the component that you want to hide as gone and set a listner to change the visibility if the textView (or your cardView ) is clicked
Textview label = (TextView ) myPosts.findViewById(R.id.cancel);
cancelButton.setOnClickListener(view->{
if(newPostCard.getVisibility() == View.VISIBLE){
TransitionManager.beginDelayedTransition(cardView,
new AutoTransition());
newPostCard.setVisibility(View.GONE);
newPostButton.setVisibility(View.VISIBLE);
}
else{
TransitionManager.beginDelayedTransition(cardView,
new AutoTransition());
newPostCard.setVisibility(View.VISIBLE);
newPostButton.setVisibility(View.GONE);
}
});

The way I got around to this problem was to add a linear layout to the questions and answer fields. here is the xml code:
<?xml version="1.0" encoding="utf-8"?>
<ScrollView 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="#android:color/holo_orange_dark"
tools:context=".faq">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingBottom="300dp"
tools:context=".faq">
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:text="#string/Welcome"
android:textColor="#000000"
android:textColorHighlight="#000000"
android:textColorHint="#000000"
android:textSize="36sp"
app:fontFamily="#font/racing_sans_one"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/frequentlyaskedquestions"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="12dp"
android:text="#string/faqs"
android:textColor="#FFFFFF"
android:textColorHighlight="#FFFFFF"
android:textColorHint="#FFFFFF"
android:textColorLink="#FFFFFF"
android:textSize="18sp"
app:fontFamily="#font/racing_sans_one"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView" />
<TextView
android:id="#+id/clickonthem"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:text="#string/clickonthem"
android:textColor="#FFFFFF"
android:textColorHighlight="#FFFFFF"
android:textColorHint="#FFFFFF"
android:textColorLink="#FFFFFF"
android:textSize="18sp"
app:fontFamily="#font/racing_sans_one"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/frequentlyaskedquestions" />
<LinearLayout
android:layout_width="409dp"
android:layout_height="294dp"
android:layout_marginTop="28dp"
android:orientation="vertical"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/clickonthem">
<TextView
android:id="#+id/faq1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:clickable="true"
android:focusable="true"
android:text="#string/q1"
android:textColor="#000000"
android:textColorHighlight="#000000"
android:textColorHint="#000000"
android:textSize="18sp"
android:textStyle="bold|italic" />
<TextView
android:id="#+id/ans"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:layout_marginTop="5dp"
android:layout_marginRight="20dp"
android:text="#string/a1"
android:textColor="#000000"
android:textColorHighlight="#000000"
android:textColorHint="#000000"
android:textColorLink="#000000"
android:textSize="18sp"
android:textStyle="bold|italic"
android:visibility="gone" />
<TextView
android:id="#+id/faq2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:layout_marginTop="20dp"
android:layout_marginRight="20dp"
android:clickable="true"
android:focusable="true"
android:text="#string/q2"
android:textColor="#000000"
android:textColorHighlight="#000000"
android:textColorHint="#000000"
android:textSize="18sp"
android:textStyle="bold|italic" />
<TextView
android:id="#+id/ans2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:layout_marginTop="5dp"
android:layout_marginRight="20dp"
android:text="#string/a2"
android:textColor="#000000"
android:textColorHighlight="#000000"
android:textColorHint="#000000"
android:textColorLink="#000000"
android:textSize="18sp"
android:textStyle="bold|italic"
android:visibility="gone" />
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
</ScrollView>

After trying a long not able to provide space between 2 card view elements inside a recycler view for both horizontal and vertical [duplicate]

This question already has answers here:
How to add dividers and spaces between items in RecyclerView
(45 answers)
Closed 2 years ago.
I want to add some space between 2 cards in both the horizontal recycler view and the vert recycler view but not able to add tried everything but won't getting a sol as u can see in the below image For horizontal both the cards are over each other.
My XML code in which I had defined recycler view Both hor. and ver. :-
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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/AppBackground">
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/appBar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:ignore="MissingConstraints">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?android:attr/actionBarSize"
android:background="#color/AppBackground">
</androidx.appcompat.widget.Toolbar>
</com.google.android.material.appbar.AppBarLayout>
<androidx.core.widget.NestedScrollView
android:id="#+id/nestedsview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="10dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/appBar">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/constraint"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="10dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent">
<TextView
android:id="#+id/text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:fontFamily="#font/playfair_display_bold_italic"
android:text="Looking for a delecious cake?"
android:textColor="#android:color/black"
android:textSize="20sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<LinearLayout
android:id="#+id/linear"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:orientation="horizontal"
app:layout_constraintBottom_toTopOf="#id/recyclerViewHorizontal"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/text">
<TextView
android:id="#+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="10dp"
android:fontFamily="#font/playfair_display_bold_italic"
android:text="More"
android:textColor="#android:color/black"
android:textSize="20sp"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="200dp"
android:layout_marginEnd="20dp"
android:text="Button"
app:layout_constraintTop_toTopOf="parent"
tools:layout_editor_absoluteX="266dp" />
</LinearLayout>
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerViewHorizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:paddingLeft="5dp"
android:paddingTop="5dp"
android:paddingRight="5dp"
android:paddingBottom="5dp"
app:layout_constraintBottom_toTopOf="#+id/textView6"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.526"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/linear"
tools:context=".FirstActivity">
</androidx.recyclerview.widget.RecyclerView>
<TextView
android:id="#+id/textView6"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="0dp"
android:layout_marginTop="10dp"
android:fontFamily="#font/playfair_display_bold_italic"
android:text="Best Selling"
android:textColor="#android:color/black"
android:textSize="20sp"
app:layout_constraintBottom_toTopOf="#+id/recyclerViewVertical"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/recyclerViewHorizontal" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerViewVertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginHorizontal="20dp"
android:layout_marginStart="30dp"
android:layout_marginTop="10dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView6"
tools:context=".FirstActivity"
>
</androidx.recyclerview.widget.RecyclerView>
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.core.widget.NestedScrollView>
</androidx.constraintlayout.widget.ConstraintLayout>
My Xml Code for card :
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout 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="wrap_content"
android:layout_height="wrap_content"
android:padding="20dp"
>
<androidx.cardview.widget.CardView
android:id="#+id/cardView"
android:layout_width="170dp"
android:layout_height="220dp"
android:padding="10dp"
android:elevation="10dp"
app:cardBackgroundColor="#color/CardColor"
app:cardCornerRadius="25sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/constraint"
android:layout_width="130dp"
android:layout_height="180dp"
android:layout_gravity="center"
android:background="#color/CardColor"
android:padding="5dp">
<ImageView
android:id="#+id/imageView"
android:layout_width="90dp"
android:layout_height="100dp"
android:foregroundGravity="center_horizontal"
android:scaleType="fitXY"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/textView4"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="5dp"
android:layout_marginTop="5dp"
android:fontFamily="#font/playfair_display_bold_italic"
android:gravity="center"
android:text="Great"
android:textColor="#android:color/black"
android:textSize="12sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/imageView" />
<TextView
android:id="#+id/textViewForPieceInfo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="5dp"
android:layout_marginTop="5dp"
android:fontFamily="#font/playfair_display_bold_italic"
android:text="Ram"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView4" />
<TextView
android:id="#+id/textViewforPrice"
android:text="Shyam"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="5dp"
android:layout_marginTop="5dp"
android:fontFamily="#font/playfair_display_bold_italic"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textViewForPieceInfo" />
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/floatingActionButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="10dp"
android:layout_marginBottom="2dp"
app:fabSize="mini"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:srcCompat="#drawable/ic_baseline_add_24" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.cardview.widget.CardView>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
My recycler view class code:
package com.example.cako;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.app.Activity;
import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.appcompat.widget.Toolbar;
import android.os.Bundle;
import android.widget.Toast;
import com.bumptech.glide.Glide;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
public class FirstActivity extends AppCompatActivity{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_first);
String []x={"Aaran", "Aaren", "Aarez", "Aarman", "Aaron", "Aaron-James", "Aarron", "Aaryan", "Abhinav","Ankit"};
String []image= {"https://upload.wikimedia.org/wikipedia/commons/thumb/c/c8/Aloo_gobi.jpg/180px-Aloo_gobi.jpg",
"https://upload.wikimedia.org/wikipedia/commons/thumb/c/c8/Aloo_gobi.jpg/180px-Aloo_gobi.jpg",
"https://upload.wikimedia.org/wikipedia/commons/thumb/d/d1/Aloo_Tikki_served_with_chutneys.jpg/180px-Aloo_Tikki_served_with_chutneys.jpg",
"https://upload.wikimedia.org/wikipedia/commons/thumb/4/4f/Aloo_Mattar.jpg/180px-Aloo_Mattar.jpg",
"https://upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Aloo_Methi_%28Aaloo_Methi%29.JPG/180px-Aloo_Methi_%28Aaloo_Methi%29.JPG",
"https://upload.wikimedia.org/wikipedia/commons/thumb/b/b0/Spicy_alloo_with_tadka_mirchi.jpg/180px-Spicy_alloo_with_tadka_mirchi.jpg",
"https://upload.wikimedia.org/wikipedia/commons/thumb/c/c8/Aloo_gobi.jpg/180px-Aloo_gobi.jpg",
"https://upload.wikimedia.org/wikipedia/commons/thumb/c/c8/Aloo_gobi.jpg/180px-Aloo_gobi.jpg",
"https://upload.wikimedia.org/wikipedia/commons/thumb/d/d1/Aloo_Tikki_served_with_chutneys.jpg/180px-Aloo_Tikki_served_with_chutneys.jpg",
"https://upload.wikimedia.org/wikipedia/commons/thumb/4/4f/Aloo_Mattar.jpg/180px-Aloo_Mattar.jpg"
};
Toolbar toolbar=findViewById(R.id.toolbar) ;
setSupportActionBar(toolbar);
RecyclerView horizontalrecyclerView =(RecyclerView)findViewById(R.id.recyclerViewHorizontal);
horizontalrecyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL,false));
horizontalrecyclerView.setAdapter(new RecyclerVview(this,x,image));
RecyclerView verticalrecyclerView =(RecyclerView)findViewById(R.id.recyclerViewVertical);
verticalrecyclerView.setLayoutManager(new GridLayoutManager(this,2));
verticalrecyclerView.setAdapter(new RecyclerVview(this,x,image));
}
}
class RecyclerVview extends RecyclerView.Adapter<RecyclerVview.Holder>{
Activity co;
String[] name;
String[] image;
public RecyclerVview(Context applicationContext, String[] x, String[] image) {
co=(Activity)applicationContext;
name=x;
this.image=image;
}
#NonNull
#Override
public Holder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v=LayoutInflater.from(co).inflate(R.layout.layout_for_horizontal_recyclerview,parent,false);
return new Holder(v);
}
#Override
public void onBindViewHolder(#NonNull final Holder holder, int position) {
holder.textViewForItemName.setText(name[position]);
Glide.with(co).load(image[position]).into(holder.image);
holder.floatingActionButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Toast.makeText(co, "yesWorking", Toast.LENGTH_SHORT).show();
Log.i("yes","log");
}
});
holder.textViewForPrice.setText("30$");
holder.textViewForPieceInfo.setText("Single Piece Only.");
}
#Override
public int getItemCount() {
return name.length;
}
public class Holder extends RecyclerView.ViewHolder{
ImageView image;
TextView textViewForItemName;
FloatingActionButton floatingActionButton;
TextView textViewForPrice;
TextView textViewForPieceInfo;
public Holder(#NonNull View itemView) {
super(itemView);
image=itemView.findViewById(R.id.imageView);
textViewForItemName=itemView.findViewById(R.id.textView4);
floatingActionButton=itemView.findViewById(R.id.floatingActionButton);
textViewForPieceInfo=itemView.findViewById(R.id.textViewForPieceInfo);
textViewForPrice=itemView.findViewById(R.id.textViewforPrice);
}
}
}

Add margin for the CarView layout and inside the ContraintLayout
and Use this for your card.
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout 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="wrap_content"
android:layout_height="wrap_content"
android:margin="8dp"
>
<androidx.cardview.widget.CardView
android:id="#+id/cardView"
android:layout_width="170dp"
android:layout_height="220dp"
android:margin="8dp"
android:elevation="10dp"
app:cardBackgroundColor="#color/CardColor"
app:cardCornerRadius="25sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/constraint"
android:layout_width="130dp"
android:layout_height="180dp"
android:layout_gravity="center"
android:background="#color/CardColor"
android:padding="5dp">
<ImageView
android:id="#+id/imageView"
android:layout_width="90dp"
android:layout_height="100dp"
android:foregroundGravity="center_horizontal"
android:scaleType="fitXY"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/textView4"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="5dp"
android:layout_marginTop="5dp"
android:fontFamily="#font/playfair_display_bold_italic"
android:gravity="center"
android:text="Great"
android:textColor="#android:color/black"
android:textSize="12sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/imageView" />
<TextView
android:id="#+id/textViewForPieceInfo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="5dp"
android:layout_marginTop="5dp"
android:fontFamily="#font/playfair_display_bold_italic"
android:text="Ram"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView4" />
<TextView
android:id="#+id/textViewforPrice"
android:text="Shyam"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="5dp"
android:layout_marginTop="5dp"
android:fontFamily="#font/playfair_display_bold_italic"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textViewForPieceInfo" />
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/floatingActionButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="10dp"
android:layout_marginBottom="2dp"
app:fabSize="mini"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:srcCompat="#drawable/ic_baseline_add_24" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.cardview.widget.CardView>
</androidx.coordinatorlayout.widget.CoordinatorLayout>

Android - TextViews not showing up in ListView

I'm having an issue to where none of my TextViews are showing up in the ListView. I'm not sure whether it is an issue with the layout or the java class itself. There are two images here, one of the application running after data had been entered into the database and one of what it is supposed to look like.
Layout for each row of data in ListView
Fragment for the ListView (Delete Button appears but not the TextViews)
row_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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="123dp"
android:layout_height="wrap_content"
android:id="#+id/resultTeamNumber"
android:text="Here Number"
android:textSize="18dp"
android:layout_alignParentTop="true"
android:layout_alignParentStart="true" />
<TextView
android:layout_width="100dp"
android:layout_height="wrap_content"
android:id="#+id/textPortcullis"
android:text="Portcullis:"
android:layout_above="#+id/textChevalFrise"
android:layout_alignParentStart="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/resultPortcullis"
android:text="Yes/No"
android:singleLine="false"
android:layout_below="#+id/resultTeamNumber"
android:layout_marginLeft="110dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/textChevalFrise"
android:text="Cheval de Frise:"
android:layout_below="#+id/resultPortcullis"
android:layout_alignParentStart="true"
android:singleLine="false" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/resultChevalFrise"
android:text="Yes/No"
android:singleLine="false"
android:layout_below="#+id/resultPortcullis"
android:layout_alignStart="#+id/resultPortcullis" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/textMoat"
android:singleLine="false"
android:layout_below="#+id/textChevalFrise"
android:layout_alignParentStart="true"
android:text="Moat:" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/resultMoat"
android:text="Yes/No"
android:singleLine="false"
android:layout_below="#+id/resultChevalFrise"
android:layout_alignStart="#+id/resultChevalFrise" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/textRamparts"
android:text="Ramparts:"
android:singleLine="false"
android:layout_below="#+id/textMoat"
android:layout_alignParentStart="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/resultRamparts"
android:text="Yes/No"
android:singleLine="false"
android:layout_above="#+id/textDrawbridge"
android:layout_alignStart="#+id/resultMoat" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/textDrawbridge"
android:text="Drawbridge:"
android:singleLine="false"
android:layout_below="#+id/textRamparts"
android:layout_alignParentStart="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/resultDrawbridge"
android:text="Yes/No"
android:singleLine="false"
android:layout_below="#+id/resultRamparts"
android:layout_alignStart="#+id/resultRamparts" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/textSallyPort"
android:text="Sally Port:"
android:singleLine="false"
android:layout_below="#+id/textDrawbridge"
android:layout_alignParentStart="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/resultSallyPort"
android:singleLine="false"
android:layout_below="#+id/resultDrawbridge"
android:layout_alignStart="#+id/resultDrawbridge"
android:text="Yes/No" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/textRockWall"
android:text="Rock Wall:"
android:singleLine="false"
android:layout_alignTop="#+id/resultPortcullis"
android:layout_toEndOf="#+id/resultPortcullis"
android:layout_marginStart="34dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/resultRockWall"
android:singleLine="false"
android:text="Yes/No"
android:layout_marginStart="46dp"
android:layout_above="#+id/resultRockTerrain"
android:layout_toEndOf="#+id/textRockTerrain" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/textRockTerrain"
android:text="Rock Terrain:"
android:singleLine="false"
android:layout_below="#+id/textRockWall"
android:layout_alignStart="#+id/textRockWall" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/resultRockTerrain"
android:singleLine="false"
android:text="Yes/No"
android:layout_alignBottom="#+id/textRockTerrain"
android:layout_alignStart="#+id/resultRockWall" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/textLowBar"
android:text="Low Bar:"
android:singleLine="false"
android:layout_above="#+id/resultRamparts"
android:layout_alignStart="#+id/textRockTerrain" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/resultLowBar"
android:singleLine="false"
android:text="Yes/No"
android:layout_below="#+id/resultRockTerrain"
android:layout_alignStart="#+id/resultRockTerrain" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#fff"
android:background="#color/colorPrimary"
android:text="Delete"
android:id="#+id/buttonDelete"
android:layout_below="#+id/textLowBar"
android:layout_toEndOf="#+id/textLowBar"
android:layout_above="#+id/resultSallyPort" />
</RelativeLayout>
ScoutFragment.java
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Color;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;
/**
* A simple {#link Fragment} subclass.
*/
public class ScoutFragment extends Fragment {
FloatingActionButton addDataScout;
ListView eListScoutInfo;
SQLiteDatabase sqLiteDatabase;
DatabaseHelper databaseHelper;
Cursor cursor;
ListScoutInfoAdapter listScoutInfoAdapter;
public ScoutFragment() {
// Required empty public constructor
} //End of ScoutFragment
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_scout, null, false);
view.setBackgroundColor(Color.WHITE);
eListScoutInfo = (ListView) view.findViewById(R.id.listScoutInfo);
listScoutInfoAdapter = new ListScoutInfoAdapter(getActivity().getApplicationContext(), R.layout.row_layout);
eListScoutInfo.setAdapter(listScoutInfoAdapter);
databaseHelper = new DatabaseHelper(getActivity().getApplicationContext());
sqLiteDatabase = databaseHelper.getReadableDatabase();
cursor = databaseHelper.getInformation(sqLiteDatabase);
//Checks if information is available in cursor
if(cursor.moveToFirst()){
do {
//Declare all strings
String teamNumber, portcullis, chevalFrise, moat, ramparts, drawbridge, sallyPort, rockWall, rockTerrain, lowBar;
//Get strings from cursor
teamNumber = cursor.getString(cursor.getColumnIndex(DatabaseContract.NewDataInfo.COL_NUMBER));
portcullis = cursor.getString(cursor.getColumnIndex(DatabaseContract.NewDataInfo.COL_PORTCULLIS));
chevalFrise = cursor.getString(cursor.getColumnIndex(DatabaseContract.NewDataInfo.COL_CHEVAL_FRISE));
moat = cursor.getString(cursor.getColumnIndex(DatabaseContract.NewDataInfo.COL_MOAT));
ramparts = cursor.getString(cursor.getColumnIndex(DatabaseContract.NewDataInfo.COL_RAMPARTS));
drawbridge = cursor.getString(cursor.getColumnIndex(DatabaseContract.NewDataInfo.COL_DRAWBRIDGE));
sallyPort = cursor.getString(cursor.getColumnIndex(DatabaseContract.NewDataInfo.COL_SALLY_PORT));
rockWall = cursor.getString(cursor.getColumnIndex(DatabaseContract.NewDataInfo.COL_ROCK_WALL));
rockTerrain = cursor.getString(cursor.getColumnIndex(DatabaseContract.NewDataInfo.COL_ROCK_TERRAIN));
lowBar = cursor.getString(cursor.getColumnIndex(DatabaseContract.NewDataInfo.COL_LOW_BAR));
//Get methods from DatabaseProvider
DatabaseProvider databaseProvider = new DatabaseProvider(teamNumber, portcullis, chevalFrise, moat, ramparts,
drawbridge, sallyPort, rockWall, rockTerrain, lowBar);
//Pass objects to add method
listScoutInfoAdapter.add(databaseProvider);
listScoutInfoAdapter.notifyDataSetChanged();
} while (cursor.moveToNext());
} //End of if statement
//Setups Floating Action Button
addDataScout = (FloatingActionButton) view.findViewById(R.id.fab);
addDataScout.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
AddScoutDataFragment fragment = new AddScoutDataFragment();
FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
fragmentTransaction.setCustomAnimations(R.anim.enter_from_right, R.anim.exit_to_left, R.anim.enter_from_left, R.anim.exit_to_right);
fragmentTransaction.replace(R.id.fragment_container, fragment);
fragmentTransaction.commit();
} //End of onClick
}); //End of setOnClickListener
return view;
} //End of onCreateView
} //End of class
I don't believe the issue is with database showing the data because some of the TextViews in the ListView don't even use the data from inside the database.

your row_layout.xml file textview in set textcolor:
<TextView
android:layout_width="123dp"
android:layout_height="wrap_content"
android:id="#+id/resultTeamNumber"
android:text="Here Number"
android:textSize="18dp"
android:layout_alignParentTop="true"
android:layout_alignParentStart="true"
android:textColor="#android:color/black"
/>

It is theme issue on your end,probably textcolor set to white in your theme change these
<item name="android:textColorPrimary">#color/white</item>
<item name="android:textColorSecondary">#color/white</item>
change it to black

set your adapter upon listview in the last..............

How to use spinners in android?

I am new to android. I am trying to make simple unit converter. The layout contains EditText for input, two spinners (to and from), an ImageButton and EditText to display answer.
I want to add values to spinners and when these values are selected i want to perform action.
My xml code:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
tools:context=".BitsBytes" >
<Spinner
android:id="#+id/SpinnerFrom"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/textView2"
android:layout_alignRight="#+id/inputvalue"
android:layout_below="#+id/textView2"
android:entries="#array/bitsbytesfrom"
android:prompt="#string/from_prompt" />
<Spinner
android:id="#+id/SpinnerTo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/textView3"
android:layout_alignRight="#+id/SpinnerFrom"
android:layout_below="#+id/textView3"
android:entries="#array/bitsbytesto"
android:prompt="#string/to_prompt" />
<TextView
android:id="#+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/SpinnerFrom"
android:layout_below="#+id/SpinnerFrom"
android:layout_marginTop="16dp"
android:text="To:"
android:textColor="#000000"
android:textSize="20dp" />
<TextView
android:id="#+id/textView6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/textView1"
android:layout_below="#+id/textView1"
android:layout_marginTop="16dp"
android:gravity="center"
android:text="Value: "
android:textSize="20dp" />
<EditText
android:id="#+id/inputvalue"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/textView6"
android:layout_alignBottom="#+id/textView6"
android:layout_toRightOf="#+id/textView6"
android:ems="10"
android:hint="Enter value"
android:inputType="numberDecimal" >
<requestFocus />
</EditText>
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/textView6"
android:layout_below="#+id/inputvalue"
android:layout_marginTop="16dp"
android:text="From:"
android:textColor="#000000"
android:textSize="20sp" />
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="19dp"
android:text="Bits/Bytes Conversion"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textSize="25dp" />
<ImageButton
android:id="#+id/convertButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/SpinnerTo"
android:layout_centerHorizontal="true"
android:background="#00000000"
android:src="#drawable/btnconvert"
android:clickable="true"/>
<TextView
android:id="#+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/answer"
android:layout_centerHorizontal="true"
android:text="Answer"
android:textAppearance="?android:attr/textAppearanceLarge" />
<EditText
android:id="#+id/answer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="28dp"
android:ems="10"
android:inputType="numberDecimal" />
</RelativeLayout>
My java code:
package com.easy.convert;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.Spinner;
import android.widget.TextView;
public class BitsBytes extends Activity{
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.bitsbytes);
ImageButton ib = (ImageButton) findViewById(R.id.convertButton);
ib.setOnClickListener(new View.OnClickListener() {
EditText etValue = (EditText) findViewById(R.id.inputvalue);
Spinner spBitsBytesFrom = (Spinner) findViewById(R.id.SpinnerFrom);
Spinner spBitsBytesTo = (Spinner) findViewById(R.id.SpinnerTo);
String txtFromSpinner = spBitsBytesFrom.getSelectedItem().toString();
String txtToSpinner = spBitsBytesTo.getSelectedItem().toString();
TextView Answer = (TextView) findViewById(R.id.answer);
public void onClick(View v)
{
if (txtFromSpinner.equals("Bits") && txtToSpinner.equals("Bytes"))
{
Double value = Double.parseDouble(etValue.getText().toString());
Double answer = (double) 0;
answer = value/8;
String stringAnswer = Double.toString(answer);
Answer.setText(stringAnswer);
}
}
});
}
}
I am filling the spinners using string array. I am not able to figure out whats wrong in my code because there is no error in logcat.

Change this,
(txtFromSpinner.equals("Bits") && txtToSpinner.equals("Bytes"))
to
if((txtFromSpinner.getSelectedItem().toString().equals("Bits")) && (txtToSpinner.getSelectedItem().toString().equals("Bytes")))
this will get the text from the item selected in the spinner.