Sunday, January 5, 2014

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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4 comments:

Guille Ortiz said...

Gracias , me sirvio de mucho! mi ejemplo:
LayoutInflater layoutInflater = (LayoutInflater) getBaseContext() .getSystemService(
Context.LAYOUT_INFLATER_SERVICE);
final View addView = layoutInflater.inflate( R.layout.row_dot, null);

edit_row_cantidad = (EditText) addView .findViewById(R.id.edit_row_cantidad);
edit_row_DOT = (EditText) addView .findViewById(R.id.edit_row_DOT);
edit_row_modelo = (EditText) addView .findViewById(R.id.edit_row_modelo);
ll_row_delete = (LinearLayout) addView .findViewById(R.id.ll_row_delete);

// Quitamos la edicion
edit_row_cantidad.setFocusable(false);
edit_row_DOT.setFocusable(false);
edit_row_modelo.setFocusable(false);
// Centramos los textos
edit_row_cantidad.setGravity(Gravity.CENTER);
edit_row_DOT.setGravity(Gravity.CENTER);
edit_row_modelo.setGravity(Gravity.CENTER);
// Seteamos valores
edit_row_cantidad.setText(edit_cantidad_dot.getText() .toString());
edit_row_DOT.setText(edit_DOT.getText().toString());
edit_row_modelo.setText(spmodelo.getSelectedItem().toString());

edit_cantidad_dot.setText("");
edit_DOT.setText("");
spmodelo.setSelection(0);

ll_row_delete.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
((LinearLayout) addView.getParent())
.removeView(addView);
}

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

y como obtube los valores

int count = container.getChildCount();
View vi = null;
for(int i1=0; i1<count; i1++) {
vi = container.getChildAt(i1);//Sacamos el layout


View vi2 = null;
for(int i2=0; i2<((ViewGroup) vi).getChildCount(); i2++) {
vi2 = ((ViewGroup) vi).getChildAt(i2);
// Log.i("contenido datarow", ((ViewGroup) vi2).getChildCount()+" filas dentro datarows");

EditText cantidad=(EditText) ((ViewGroup) vi2).getChildAt(1);
EditText DOT=(EditText) ((ViewGroup) vi2).getChildAt(3);
EditText modelo=(EditText) ((ViewGroup) vi2).getChildAt(5);
String strcant=cantidad.getText().toString();
String strdot=DOT.getText().toString();
String strmodelo=modelo.getText().toString();

}

}

shashi patil said...

how to send all the edittext values which are generated dynamically as a single parameter????

Andr.oid Eric said...

hello shashi patil,

Please check the OnClickListener of buttonShowAll, it already show how to walk through the views, get the texts, show in Toast.

Naveen Natarajan said...

Hi , i have tried and works fine . but how can we edit the value when user click the Insert button. say i have modified like this for modification of text value when user click the insert button . so current i m facing that need to get position of that button. CODE:

buttonInsert.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int position = 2;
String showallPrompt = "";
View childView = container.getChildAt(position);
TextView childTextView = (TextView) (childView.findViewById(R.id.text_name));
String childTextViewText = (String) (childTextView.getText());
showallPrompt += position + ": " + childTextViewText + "\n";

Toast.makeText(MainActivity.this,
showallPrompt,
Toast.LENGTH_LONG).show();
((TextView) (childTextView.findViewById(R.id.text_name))).setText("HELLO ");
}
});
container.addView(addView, 0);


When hard coding the Position works fine. but i cant get position of button dynamically. i tried this :
int position=(Integer)v.getTag();

App stoped unfortunately. please give me suggestions