This Android Java Program demonstrates a Simple Compound Control.
Here is source code of the Program demonstrates a Simple Compound Control. The program is successfully compiled and run on a Windows system using Eclipse Ide. The program output is also shown below.

Compound controls are atomic, self-contained View Groups that contain multiple child Views laid out and connected together. When you create a compound control, you define the layout, appearance, and interaction of the Views it contains. You create compound controls by extending a ViewGroup (usually a layout). To create a new compound control, choose the layout class that’s most suitable for positioning the child controls and extend it.

Main Activity


package com.example.clerable_edit_text;

import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new Clearable_Edit_Text(this));
Log.v("oncreate()", "finished");
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

}


Clearable Edit Text


package com.example.clerable_edit_text;

import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;

public class Clearable_Edit_Text extends LinearLayout {

// Define the elements or the child controls of our compound view
private EditText edittext;
private Button clear_buuton;

public Clearable_Edit_Text(Context context) {
super(context);
// TODO Auto-generated constructor stub

String inflatorservice = Context.LAYOUT_INFLATER_SERVICE;
LayoutInflater li;

li = (LayoutInflater) getContext().getSystemService(inflatorservice);
/*
* inflate the resource R.layout.clearable_edit_text in the context of
* this view and automatically attach to this view(true is to
* automatically attach to this view)
*/
li.inflate(R.layout.clerable_edit_text, this, true);

edittext = (EditText) findViewById(R.id.Edittext);
clear_buuton = (Button) findViewById(R.id.button1);

hookbutton();
}

private void hookbutton(){

clear_buuton.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
edittext.setText("");
Log.v("clearButton", "clicked");

}
});
}
}

ClearableEdittext.xml


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<EditText
android:id="@+id/Edittext"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
</EditText>

<Button
android:id="@+id/button1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Clear" />

</LinearLayout>