Android Open Source - yammp Checkable Relative Layout

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License

The source code is released under:

GNU Lesser General Public License

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Java Source Code

/*
 * Copyright (C) 2008 The Android Open Source Project
 */*from  w  ww  .j  a  v  a2  s.  c o m*/
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.yammp.widget;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.Checkable;
import android.widget.RelativeLayout;

/**
 * A special variation of RelativeLayout that can be used as a checkable object.
 * This allows it to be used as the top-level view of a list view item, which
 * also supports checking. Otherwise, it works identically to a RelativeLayout.
 */
public class CheckableRelativeLayout extends RelativeLayout implements Checkable {

  private boolean mChecked;

  private static final int[] CHECKED_STATE_SET = { android.R.attr.state_checked };

  public CheckableRelativeLayout(Context context, AttributeSet attrs) {

    super(context, attrs);
  }

  @Override
  public boolean isChecked() {

    return mChecked;
  }

  @Override
  public void setChecked(boolean checked) {

    if (mChecked != checked) {
      mChecked = checked;
      refreshDrawableState();
    }
  }

  @Override
  public void toggle() {

    setChecked(!mChecked);
  }

  @Override
  protected int[] onCreateDrawableState(int extraSpace) {

    final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
    if (isChecked()) {
      mergeDrawableStates(drawableState, CHECKED_STATE_SET);
    }
    return drawableState;
  }
}

Java Source Code List