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Question

I confused with the issue

Why can NOT display the content when the TableLayout tag has more children (added programmatically) at runtime in Android studio?

as the title says.

I’m sure that

The project uses test9.xml as content view at startup of runtime. (See following MainActivity.kt)
The initial screen of runtime is shown as At startup of runtime in Screenshot at runtime section.

3.There are NO compiler error and exception at runtime in this project.

After I clicked ADD AN ITEM button, the TableLayout with id examination_tablelayout (See following test9.xml) has more one child than before. (See video in Demo section)
I add one child into TableLayout with id examination_tablelayout through .addView method.
Before adding one child, I have fully set the property layoutParams for the child and its descendant in the child) through Brian Cooley’s Answer in the stackoverflow

I don’t know the root cause of the issue.

Appreciation
Any replies about this issue will be very appreciated.
Thank you very much, readers.

infos

Screenshot at runtime

At startup of runtime

After I click the “ADD AN ITEM” button

Demo

The demo of result is available at YT channel. (P.S. DON’T care about the background sound, that’s the music NOT relates to the project)

Demo of my project MyTable1 in Android Studio

MainActivity.kt

package com.example.mytable1

import android.icu.text.SimpleDateFormat
import android.os.Bundle
import android.util.Log
import android.view.View
import android.view.ViewGroup
import android.widget.Button
import android.widget.EditText
import android.widget.TableLayout
import android.widget.TableRow
import android.widget.TextView
import androidx.activity.ComponentActivity

const val TAG = "MainActivity"
class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        //setContentView(R.layout.test1)
        //setContentView(R.layout.test2)
        //setContentView(R.layout.test3)
        // setContentView(R.layout.test4)
        //setContentView(R.layout.test5)
        //setContentView(R.layout.test6)
        //setContentView(R.layout.test7)
        //setContentView(R.layout.test8)
        setContentView(R.layout.test9)
        //setContentView(R.layout.test10)
        //setContentView(R.layout.test11)

        //setContentView(R.layout.main);

        var index = 0
        val examination_tableLayout = findViewById<TableLayout>(R.id.examination_tablelayout)


        findViewById<Button>(R.id.add_an_item_button)
            .setOnClickListener {

                val input_raw_date = findViewById<EditText>(R.id.examination_date).text.toString()
                val input_item = findViewById<EditText>(R.id.examination_item).text.toString()
                val input_value = findViewById<EditText>(R.id.examination_value).text.toString()
                var new_item_flag = true


                if(input_raw_date.length == 8 && isInteger(input_raw_date)){
                    //val input_parsed_date =  simpleDateFormat.parse(input_raw_date)
                    findViewById<TextView>(R.id.invalid_date_message).visibility = View.INVISIBLE
                }else{
                    findViewById<TextView>(R.id.invalid_date_message).visibility = View.VISIBLE
                    new_item_flag = false
                }

                if(input_item.isNotEmpty()) {
                    Log.d(TAG, "input_item:" + input_item)
                    findViewById<TextView>(R.id.invalid_item_message).visibility = View.INVISIBLE
                }else{
                   findViewById<TextView>(R.id.invalid_item_message).visibility = View.VISIBLE
                    new_item_flag = false
                }

                if(input_value.isNotEmpty()) {
                    Log.d(TAG, "input_value:" + input_value)
                    findViewById<TextView>(R.id.invalid_value_message).visibility = View.INVISIBLE
                }else{
                    findViewById<TextView>(R.id.invalid_value_message).visibility = View.VISIBLE
                    new_item_flag = false
                }

                if(new_item_flag){

                    Log.d(TAG,"new_item_flag == true is true")

                    val tablerow1 = TableRow(this)
                    val textView_date = TextView(this)
                    val textView_item = TextView(this)
                    val textView_value = TextView(this)

                    tablerow1.layoutParams =
                        ViewGroup.LayoutParams(TableLayout.LayoutParams.MATCH_PARENT,TableLayout.LayoutParams.WRAP_CONTENT)
                    tablerow1.tag = "tablerow[$index]"
                    index += 1

                    textView_date.text = input_raw_date
                    textView_item.text = input_item
                    textView_value.text = input_value

                    textView_date.layoutParams =
                        ViewGroup.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT,TableRow.LayoutParams.WRAP_CONTENT)
                    textView_item.layoutParams =
                        ViewGroup.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT,TableRow.LayoutParams.WRAP_CONTENT)
                    textView_value.layoutParams =
                        ViewGroup.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT,TableRow.LayoutParams.WRAP_CONTENT)

                    tablerow1.addView(textView_date)
                    tablerow1.addView(textView_item)
                    tablerow1.addView(textView_value)

                    Log.d(TAG,"After event, tablerow1 tag has n children where n: "+tablerow1.childCount.toString())

                    examination_tableLayout.addView(tablerow1,TableLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.MATCH_PARENT))

                    Log.d(TAG,"success to add an tablerow1 tag programmatically into examination_tableLayout")
                }else{
                    Log.d(TAG,"new_item_flag == true is false")
                }

                Log.d(TAG,"After event, examination_tableLayout tag has n children where n: "+examination_tableLayout.childCount.toString())
                for(i in 0..examination_tableLayout.childCount-1){
                    val child = examination_tableLayout.getChildAt(i)
                    Log.d(TAG,"The "+i.toString()+"th child has tag: "+child.tag.toString())
                }
            }
    }
}

fun isInteger(number : Any?) : Boolean{
    val integerChars = '0'..'9'
    if (number == null){
        return false
    }
    val s1 = number.toString()
    if (number is Number){
        return true
    }
    for(i in s1.indices){
        val c = s1[i]
        if(c !in integerChars){
            return false
        }
    }
    return true
}

test9.xml code (at code page)

<?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"
    android:weightSum="1"
    >
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="0.5"
        tools:ignore="Suspicious0dp">
        <TableLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="horizontal"
            >
            <TableRow>
                <TextView
                    android:layout_column="1"
                    android:text="Date:"
                    android:padding="3dip" />

                <EditText
                    android:id="@+id/examination_date"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:hint="20200101"
                    android:inputType="date"
                    tools:ignore="TouchTargetSizeCheck" />
            </TableRow>

            <TableRow>
                <TextView
                    android:layout_column="1"
                    android:text="Item:"
                    android:padding="3dip" />
                <EditText
                    android:id="@+id/examination_item"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:hint="item"
                    android:inputType="text"
                    tools:ignore="TouchTargetSizeCheck" />
            </TableRow>

            <TableRow>
                <TextView
                    android:layout_column="1"
                    android:text="value:"
                    android:padding="3dip" />
                <EditText
                    android:id="@+id/examination_value"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:hint="0"
                    android:inputType="number"
                    tools:ignore="TouchTargetSizeCheck" />
            </TableRow>
            <Button
                android:id="@+id/add_an_item_button"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Add an item" />

            <TextView
                android:id="@+id/invalid_date_message"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="invalid date. please enter a date whose format is yyyymmdd (e.g. 20010101)"
                android:inputType="none"
                android:textSize="12sp"
                android:textColor="@android:color/system_error_light"
                android:visibility="invisible"
                tools:ignore="TextFields,TouchTargetSizeCheck" />

            <TextView
                android:id="@+id/invalid_item_message"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="invalid date. please enter an item whose is NOT empty (e.g. item1)"
                android:inputType="none"
                android:textSize="12sp"
                android:textColor="@android:color/system_error_light"
                android:visibility="invisible"
                tools:ignore="TouchTargetSizeCheck" />

            <TextView
                android:id="@+id/invalid_value_message"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="invalid date. please enter a nonnegative integer as value(e.g. 1)"
                android:inputType="none"
                android:textSize="12sp"
                android:textColor="@android:color/system_error_light"
                android:visibility="invisible"
                tools:ignore="TouchTargetSizeCheck" />
        </TableLayout>
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="0.5"
        tools:ignore="Suspicious0dp">
        <TableLayout
            android:id="@+id/examination_tablelayout"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:stretchColumns="0,1"
            >
            <TableRow android:layout_width="fill_parent">
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Date"
                    />
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Item" />

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Value" />

            </TableRow>
        </TableLayout>
    </LinearLayout>
</LinearLayout>

test9.xml UI design (at design page)

test9.xml

Absolute path of test9.xml

C:Users{USERNAME}AndroidStudioProjectsMyTable1appsrcmainreslayouttest9.xml

Project

The project (MyTable1.zip) is available at Github

MyTable1.zip

See

Brian Cooley’s Answer in stackoverflow

and see API reference in Android Docs for more understanding of the syntax.

ViewGroup

ViewGroup.LayoutParams

TableLayout

Danh mục