Android Open Source - downtown Checkable Relative Layout

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License

The source code is released under:

GNU General Public License

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Java Source Code

package org.dklisiaris.downtown.widgets;
// w  w  w .  j  a v a 2 s.c om
import java.util.ArrayList;
import java.util.List;

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Checkable;
import android.widget.RelativeLayout;

/**
 * Extension of a relative layout to provide a checkable behaviour
 * 
 * @author marvinlabs
 */
public class CheckableRelativeLayout extends RelativeLayout implements Checkable {

  /**
   * Interface definition for a callback to be invoked when the checked state of a CheckableRelativeLayout changed.
   */
  public static interface OnCheckedChangeListener {
    public void onCheckedChanged(CheckableRelativeLayout layout, boolean isChecked);
  }

  public CheckableRelativeLayout(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    initialise(attrs);
  }

  public CheckableRelativeLayout(Context context, AttributeSet attrs) {
    super(context, attrs);
    initialise(attrs);
  }

  public CheckableRelativeLayout(Context context, int checkableId) {
    super(context);
    initialise(null);
  }

  /*
   * @see android.widget.Checkable#isChecked()
   */
  public boolean isChecked() {
    return isChecked;
  }

  /*
   * @see android.widget.Checkable#setChecked(boolean)
   */
  public void setChecked(boolean isChecked) {
    this.isChecked = isChecked;
    for (Checkable c : checkableViews) {
      c.setChecked(isChecked);
    }

    if (onCheckedChangeListener != null) {
      onCheckedChangeListener.onCheckedChanged(this, isChecked);
    }
  }

  /*
   * @see android.widget.Checkable#toggle()
   */
  public void toggle() {
    this.isChecked = !this.isChecked;
    for (Checkable c : checkableViews) {
      c.toggle();
    }
  }

  public void setOnCheckedChangeListener(OnCheckedChangeListener onCheckedChangeListener) {
    this.onCheckedChangeListener = onCheckedChangeListener;
  }

  @Override
  protected void onFinishInflate() {
    super.onFinishInflate();

    final int childCount = this.getChildCount();
    for (int i = 0; i < childCount; ++i) {
      findCheckableChildren(this.getChildAt(i));
    }
  }

  /**
   * Read the custom XML attributes
   */
  private void initialise(AttributeSet attrs) {
    this.isChecked = false;
    this.checkableViews = new ArrayList<Checkable>(5);
  }

  /**
   * Add to our checkable list all the children of the view that implement the interface Checkable
   */
  private void findCheckableChildren(View v) {
    if (v instanceof Checkable) {
      this.checkableViews.add((Checkable) v);
    }

    if (v instanceof ViewGroup) {
      final ViewGroup vg = (ViewGroup) v;
      final int childCount = vg.getChildCount();
      for (int i = 0; i < childCount; ++i) {
        findCheckableChildren(vg.getChildAt(i));
      }
    }
  }

  private boolean isChecked;
  private List<Checkable> checkableViews;
  private OnCheckedChangeListener onCheckedChangeListener;
}

Java Source Code List