Get child view at run-time, using getChildCount() and getChildAt().

This exercise show how to retrieve child view at run time, using getChildCount() and getChildAt().

Last exercise show how to "Get text from dynamically added view" using button with OnClickListener to include text directly while creating and adding the view. In this exercise, we add a button, named "Show All", to retrieve all dynamic added view indirectly from their parent LinearLayout, container.

Get child view at run-time, using getChildCount() and getChildAt().
Get child view at run-time, using getChildCount() and getChildAt().

package com.example.androiddynamicview;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import android.animation.LayoutTransition;
import android.app.Activity;
import android.content.Context;

public class MainActivity extends Activity {

EditText textIn;
Button buttonAdd;
LinearLayout container;
Button buttonShowAll;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textIn = (EditText)findViewById(R.id.textin);
buttonAdd = (Button)findViewById(R.id.add);
container = (LinearLayout)findViewById(R.id.container);

buttonAdd.setOnClickListener(new OnClickListener(){

@Override
public void onClick(View arg0) {
LayoutInflater layoutInflater =
(LayoutInflater) getBaseContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
final View addView = layoutInflater.inflate(R.layout.row, null);
final TextView textOut = (TextView)addView.findViewById(R.id.textout);
textOut.setText(textIn.getText().toString());
Button buttonRemove = (Button)addView.findViewById(R.id.remove);
buttonRemove.setOnClickListener(new OnClickListener(){

@Override
public void onClick(View v) {
((LinearLayout)addView.getParent()).removeView(addView);
}});

Button buttonInsert = (Button)addView.findViewById(R.id.insert);
buttonInsert.setOnClickListener(new OnClickListener(){

@Override
public void onClick(View v) {
String text = textOut.getText().toString();
String newText = textIn.getText().toString() + text;
textIn.setText(newText);
}});

container.addView(addView, 0);
}});

LayoutTransition transition = new LayoutTransition();
container.setLayoutTransition(transition);

buttonShowAll = (Button)findViewById(R.id.showall);
buttonShowAll.setOnClickListener(new OnClickListener(){

@Override
public void onClick(View arg0) {

String showallPrompt = "";

int childCount = container.getChildCount();
showallPrompt += "childCount: " + childCount + "\n\n";

for(int c=0; c<childCount; c++){
View childView = container.getChildAt(c);
TextView childTextView = (TextView)(childView.findViewById(R.id.textout));
String childTextViewText = (String)(childTextView.getText());

showallPrompt += c + ": " + childTextViewText + "\n";
}

Toast.makeText(MainActivity.this,
showallPrompt,
Toast.LENGTH_LONG).show();
}});
}
}

<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"
android:orientation="vertical"
tools:context=".MainActivity" >

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:autoLink="web"
android:text="http://android-er.blogspot.com/"
android:textStyle="bold" />

<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="@+id/add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:text="Add"/>
<EditText
android:id="@+id/textin"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_toLeftOf="@id/add"/>
</RelativeLayout>
<Button
android:id="@+id/showall"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Show All" />
<LinearLayout
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
</LinearLayout>

</LinearLayout>

The layout of the dynamic view, /res/layout/row.xml, refer last exercise.



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