Develop Reference

Problems creating a table view in Android

I am trying to program a variable table to display data from a database in Android. I am now so far that I can display 2 different lines but the program does not create any more lines and I simply do not find the error.
main Activity:
package com.example.tabellentest;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Context;
import android.content.Intent;
import android.view.View;
import android.os.Bundle;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
String[] textArray ={" Null "," Eins ", " Zwei ", " Drei ", " Vier ", " Fünf "," SechsHundertZweiUndDreizig ", " Sechs "};
String[] textArray1 ={" 12Null "," 12Eins ", " 12Zwei ", " 12Drei ", " 12Vier ", " 12Fünf "," 12SechsHundertZweiUndDreizig ", " Sechs "};
private TableLayout firstTable;
private TableLayout secondTable;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ExpandTextView();
this.firstTable = (TableLayout) findViewById(R.id.tableLayout1);
this.secondTable = (TableLayout) findViewById(R.id.tableLayout2);
ExpandTableRow();
}
public TextView CreateTextView(String text, int index){
TextView textView1 = new TextView(getApplicationContext());
textView1.setText(text);
return textView1;
}
public void ExpandTextView (){
LinearLayout linearLayout = findViewById(R.id.linearLayout1);
for( int i = 0; i < textArray.length; i++ )
{
linearLayout.addView(CreateTextView(textArray[i], i));
TextView textView = new TextView(this);
//textView.setText(textArray[i]);
//textView.setId(i);
linearLayout.addView(textView);
}
}
public void ExpandTableRow(){
for (int ab = 2; ab < 8; ab++){
LinearLayout linearLayout2 = findViewById(R.id.linearLayout2);
for( int i = 0; i < textArray1.length; i++ ) {
linearLayout2.addView(CreateTextView(textArray1[i], i));
}
Context context = getApplicationContext();
TableRow row = new TableRow(context);
secondTable.addView(row);
for( int i = 0; i < textArray1.length; i++ ) {
linearLayout2.addView(CreateTextView(textArray1[i], i));
}
}
}
}
activity_main.xml:
<?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"
tools:context=".MainActivity">
<HorizontalScrollView
android:id="#+id/horizontalScrollView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="64dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<ScrollView
android:layout_width="wrap_content"
android:layout_height="match_parent">
<TableLayout
android:id="#+id/tableLayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TableRow
android:id="#+id/tableRow1"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:id="#+id/linearLayout1"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="horizontal"/>
</TableRow>
</TableLayout>
</ScrollView>
</HorizontalScrollView>
<HorizontalScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="80dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<TableLayout
android:id="#+id/tableLayout2"
android:layout_width="wrap_content"
android:layout_height="match_parent">
<TableRow
android:id="#+id/tableRow2"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:id="#+id/linearLayout2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" />
</TableRow>
</TableLayout>
</HorizontalScrollView>
</androidx.constraintlayout.widget.ConstraintLayout>
I'm hoping that anybody can give me a tip to find the problem.

Android Recyclerview GridLayoutManager when row given layout doesn't wrap its content

I'm trying to make a color picker application by using Recyclerview and GridlayoutManager for listing the colors. I am using ImageButton for presenting the colors. There are two recyclerviews, first one displays main colors that i made up and the second one displays the tint and shadow of the selected color from the first one. My code is ugly but this is for experimenting so right now i just want to make the second recyclerview with gridlayoutmanager be in two rows and 4 columns. I could make it with the code below but it only shows the first 4 colors and for the other ones i have to scroll down the view.
MainActivity:
package tr.com.beyes.colorpicker;
import android.content.res.Resources;
import android.graphics.Color;
import android.support.v4.content.res.TypedArrayUtils;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.Toast;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Resources r=getResources();
int[] fontColors = r.getIntArray(R.array.fontcolors);
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.fontColorView);
GridLayoutManager gridLayoutManager = new GridLayoutManager(this,11, GridLayoutManager.VERTICAL, true);
recyclerView.setLayoutManager(gridLayoutManager);
RecyclerView recyclerView2 = (RecyclerView) findViewById(R.id.fontColorViewSub);
GridLayoutManager gridLayoutManager2 = new GridLayoutManager(this,4);
recyclerView2.setLayoutManager(gridLayoutManager2);
int[] tint = new int[8];
tint[0]=(Color.rgb(0,0,0));
int red = Color.red(fontColors[0]);
int green = Color.green(fontColors[0]);
int blue = Color.blue(fontColors[0]);
for(int i=1; i<7;i++){
red = (int) (red + (255-red) * 0.25);
green = (int) (green + (255-green) * 0.25);
blue = (int) (blue + (255-blue) * 0.25);
tint[i]=(Color.rgb(red,green,blue));
}
tint[7]=(Color.rgb(255,255,255));
ColorPickerAdapter colorPickerAdapter2 = new ColorPickerAdapter(tint,this, null);
recyclerView2.setAdapter(colorPickerAdapter2);
ColorPickerAdapter colorPickerAdapter = new ColorPickerAdapter(fontColors,this,colorPickerAdapter2);
recyclerView.setAdapter(colorPickerAdapter);
}
}
Activity_main.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: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="tr.com.beyes.colorpicker.MainActivity"
android:orientation="vertical">
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/fontColorView"
>
</android.support.v7.widget.RecyclerView>
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/fontColorViewSub"
android:layout_marginTop="20dp"
>
</android.support.v7.widget.RecyclerView>
</LinearLayout>
colorbox.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageButton
android:layout_width="match_parent"
android:layout_height="match_parent"
android:minHeight="24dp"
android:id="#+id/fontColorBox"
android:clickable="true"
/>
</LinearLayout>

1. Use setHasFixedSize(true) to recyclerView and recyclerView2
2. Update gridLayoutManager2 parameter as below:
GridLayoutManager gridLayoutManager2 = new GridLayoutManager(this, 4, GridLayoutManager.VERTICAL, true);
3. Use NestedScrollView as a container of your LinearLayout.
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context="tr.com.beyes.colorpicker.MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:orientation="vertical">
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/fontColorView" />
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/fontColorViewSub"
android:layout_marginTop="20dp" />
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
Hope this will work~

Read View's children while initializing View

This View is supposed to make a Button for each LinearLayout inside itself, and put that LinearLayout inside a ScrollView. I think the problem is that the LinearLayouts don't exist yet, since they are created AFTER initializing this view. Therefore getChildCound() returns zero. You could work around this by hard coding the number of Buttons or getting it from a XML attribute, but you can't put the LinearLayouts in the ScrollViews, when there are no LinearLayouts. Is there a way to work around this?
code:
package mika.actual;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Color;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ScrollView;
import java.util.ArrayList;
public class AccordionWidget extends LinearLayout{
public AccordionWidget(Context c, AttributeSet attrs) {
super(c, attrs);
final Context context = c;
final int count = this.getChildCount();
TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.accordion);
String[] btns = getResources().getStringArray(R.array.buttons);
ArrayList<LinearLayout> lls = new ArrayList <> (count);
for(int i = 0; i < count; i++){
View child = this.getChildAt(i);
if (child instanceof LinearLayout) {
lls.add((LinearLayout)child);
}
}
for(int i = 0; i < lls.size(); i++){
if(btns[i] == null){
Log.e("error: ", "Please add more Button lables to the strings.xml file.");
}
final Button btn = new Button(context);
final LinearLayout ll = lls.get(i);
final ScrollView sv = new ScrollView(context);
final int col_pressed = a.getColor(R.styleable.accordion_backgroundColorPressed, Color.BLACK);
final int col_unpressed = a.getColor(R.styleable.accordion_backgroundColorUnpressed, Color.YELLOW); //Black and yellow, black and yellow...
LayoutParams btnparams = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
LayoutParams swparams = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
LayoutParams llparams = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
btn.setText(btns[i]);
btn.setBackgroundColor(col_pressed);
llparams.weight = 1f;
btn.setLayoutParams(btnparams);
ll.setLayoutParams(llparams);
sv.setLayoutParams(swparams);
ll.setOrientation(LinearLayout.VERTICAL);
sv.setVisibility(View.GONE);
this.addView(sv);
this.addView(btn);
sv.addView(ll);
btn.setOnClickListener(new OnClickListener() {
private boolean btnstate = false;
#Override
public void onClick(View v) {
if (btnstate) {
btn.setBackgroundColor(col_pressed);
sv.setVisibility(View.VISIBLE);
btnstate = true;
} else {
btn.setBackgroundColor(col_unpressed);
sv.setVisibility(View.GONE);
btnstate = false;
}
}
});
}
a.recycle();
}
}
XML:
<?xml version="1.0" encoding="utf-8"?>
<mika.actual.AccordionWidget
xmlns:accordion="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
accordion:text_color="#color/text_color"
accordion:backgroundColorPressed="#color/button_pressed"
accordion:backgroundColorUnpressed="#color/button_not_pressed"
android:id="#+id/swaggy"
android:layout_height="match_parent"
android:layout_width="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="yolooooo yooo"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="yolooooo yooo"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="yolooooo yooo"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="yolooooo yooo"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="yolooooo yooo"/>
</LinearLayout>
</mika.actual.AccordionWidget>

The idea is that you need to put your logic into onLayout
Something like this:
#Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
final Context context = c;
final int count = this.getChildCount();
TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.accordion);
String[] btns = getResources().getStringArray(R.array.buttons);
ArrayList<LinearLayout> lls = new ArrayList <> (count);
for(int i = 0; i < count; i++){
View child = this.getChildAt(i);
if (child instanceof LinearLayout) {
lls.add((LinearLayout)child);
}
}
.......
See this
Make sure that you call child.layout() for each child inside this method.

You can create custom LinearLayout inside ScrollView:
<ScrollView>
<LinearLayout android:id="#+id/parent"/>
</ScrollView>
Then Create java class for your layout and inflate it.
See this

LinearLayout not displaying Items

What i'm trying to do is add create an application that locates some local business. So the activity I'm doing displays the business information. Some business have severals stores located on the city, and some others only have one. So here is my problem: In the View I have Scroll View with all the elements, and a linear layout inside the scrollview. If the business has more then one store, i will add each store information in a new text view and add the text view to the layout (this is done all by code). But at the moment to display the layout, it only displays me one store, instead of showing me 3 or 4. What I'm I doing wrong? Here is the method setupViews(), which is the one in chanrge of the displaying:
private void setupViews() throws SQLException {
ImageView iv = (ImageView) findViewById(R.id.negocio_logo);
try {
iv.setImageBitmap(BitmapFactory.decodeByteArray(toShow.getImgSrc(),
0, toShow.getImgSrc().length));
} catch (NullPointerException npe) {
iv.setBackgroundColor(Color.WHITE);
}
TextView nombreEmpresa = (TextView) findViewById(R.id.nombre_empresa);
nombreEmpresa.setText(toShow.getNombre());
TextView descripcionEmpresa = (TextView) findViewById(R.id.descripcion_empresa);
descripcionEmpresa.setText(toShow.getDescripcion());
TextView direccionEmpresa = (TextView) findViewById(R.id.direccion_empresa);
direccionEmpresa.setText(toShow.getDireccion());
LinearLayout rl = (LinearLayout) findViewById(R.id.linear_layout_si);
TextView suc = (TextView) findViewById(R.id.sucursales_empresa);
sucursalDAO sDAO = new sucursalDAO();
boolean tieneSucursales = sDAO.hasSucursales(toShow.getId());
if (tieneSucursales == false) {
suc.setVisibility(View.GONE);
// sucs.setVisibility(View.GONE);
} else {
suc.setVisibility(View.VISIBLE);
ArrayList<String> sucursales = sDAO.getStringSucursales(toShow
.getId());
ArrayList<TextView> tvs = new ArrayList<TextView>();
for (int i = 0; i < sucursales.size(); i++) {
TextView tv = new TextView(this);
tv.setText(sucursales.get(i));
tv.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT));
tvs.add(tv);
}
for (int i = 0; i < tvs.size(); i++) {
rl.addView(tvs.get(i), i);
}
}
}
And here is the XML of my view:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/RL"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/White"
android:orientation="vertical" >
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/widgetscroll"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/White"
android:orientation="vertical" >
<ImageView
android:id="#+id/negocio_logo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:contentDescription="#string/logo_negocio" />
<TextView
android:id="#+id/datos_empresa"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="#id/negocio_logo"
android:background="#drawable/barra"
android:text="#string/datos_empresa"
android:textColor="#color/White" />
<TextView
android:id="#+id/nombre_empresa"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="#id/datos_empresa"
android:text="#string/testing" />
<TextView
android:id="#+id/descripcion_empresa"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="#id/nombre_empresa"
android:text="#string/testing" />
<TextView
android:id="#+id/direccion_empresa"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="#id/descripcion_empresa"
android:text="#string/testing" />
<TextView
android:id="#+id/sucursales_empresa"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="#id/direccion_empresa"
android:background="#drawable/barra"
android:text="#string/sucursales"
android:visibility="gone" />
<LinearLayout
android:id="#+id/linear_layout_si"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="#id/sucursales_empresa" >
</LinearLayout>
<TextView
android:id="#+id/contacto_empresa"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="#id/linear_layout_si"
android:text="#string/testing" />
</RelativeLayout>
</ScrollView>
</RelativeLayout>

I think you forgot to set orientation on LinearLayout and it's showing horitzontal

I bet you forgot to set the orientation of the LinearLayout.

dynamic checkbox creation

I am wanting to create a set of checkboxes dynamically during run time in my android application. When the application runs nothing shows up except the button. What am i forgetting? Thanks in advance!
public class DataNotificationSurvey extends Activity {
private Date timeStamp;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.datanotifylayout);
final Button notifySubmitButton = (Button) findViewById(R.id.notifySubmitButton);
TableLayout t1 = (TableLayout)findViewById(R.id.notificationTableLayout);
for(int i = 0; i < 5; i++) {
TableRow tr = new TableRow(this);
CheckBox chk = new CheckBox(this);
chk.setText(Integer.toString(i));
tr.addView(chk);
t1.addView(tr);
}
notifySubmitButton.setOnClickListener(
new View.OnClickListener() {
#Override
public void onClick(View v) {
finish();
}
});
}
//My xml layout, will be changing this later to the one posted below to see if it works.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:id="#+id/notificationLinearLayout"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TableLayout
android:id="#+id/notificationTableLayout"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TableRow
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<Button android:text="Static Button"/>
</TableRow>
</TableLayout>
<Button
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:id="#+id/notifySubmitButton"
android:text="Submit"></Button>
</LinearLayout>

This works fine for me.
public class DynamicTableRowWithCheckBox extends Activity
{
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final Button notifySubmitButton = (Button) findViewById(R.id.myButton);
TableLayout table = (TableLayout) findViewById(R.id.myTable);
for (int i = 0; i < 3; i++)
{
TableRow row = new TableRow(this);
CheckBox chk = new CheckBox(this);
chk.setText(Integer.toString(i));
row.addView(chk);
table.addView(row);
}
notifySubmitButton.setOnClickListener(
new View.OnClickListener()
{
#Override
public void onClick(View v)
{
finish();
}
});
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/hello" />
<Button
android:id="#+id/myButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Close" />
<TableLayout
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:id="#+id/myTable" />
</LinearLayout>

Change your XML to:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:id="#+id/notificationLinearLayout"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TableLayout
android:id="#+id/notificationTableLayout"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TableRow>
<Button
android:text="Static Button" />
</TableRow>
</TableLayout>
<Button
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:id="#+id/notifySubmitButton"
android:text="Submit"></Button>
</LinearLayout>
This removes the layout_height of your TableLayout to wrap_content, and it removes the height and width settings of your TableRow, because, "The children of a TableRow do not need to specify the layout_width and layout_height attributes in the XML file. TableRow always enforces those values to be respectively MATCH_PARENT and WRAP_CONTENT."