EditText+Button組合自定義視圖

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="match_parent"
  android:layout_height="wrap_content">
  <EditText
    android:id="@+id/editText"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
  />
  <Button
    android:id="@+id/clearButton"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="Clear"
  />
</LinearLayout>

package com.paad.views;

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

/**
 * Listing 4-13: Constructing a compound View
 */
public class ClearableEditText extends LinearLayout {

  EditText editText;
  Button clearButton;

  public ClearableEditText(Context context) {
    super(context);

    // Inflate the view from the layout resource.
    String infService = Context.LAYOUT_INFLATER_SERVICE;
    LayoutInflater li;
    li = (LayoutInflater)getContext().getSystemService(infService);
    li.inflate(R.layout.clearable_edit_text, this, true);

    // Get references to the child controls.
    editText = (EditText)findViewById(R.id.editText);
    clearButton = (Button)findViewById(R.id.clearButton);

    // Hook up the functionality
    hookupButton();
  }
    
  /**
   * Listing 4-14: Implementing the Clear Text Button
   */
  private void hookupButton() {
    clearButton.setOnClickListener(new Button.OnClickListener() {
      public void onClick(View v) {
        editText.setText("");
      }
    });
  }

}