Android Open Source - CenteredContentButton Centered Content Toggle Group

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2013 Steelkiwi Development, Julia Zudikova
 * //w  w w. j  ava  2s  .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 com.skd.centeredcontentbutton;

import android.annotation.SuppressLint;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.LinearLayout;

import com.skd.centeredcontentbutton.CenteredContentToggleButton.OnCheckedChangeListener;

/*
 * Represents a group for toggle button-like components (like RadioGroup for RadioButtons).
 * Can be used to simulate tabs behavior.
 */

public class CenteredContentToggleGroup extends LinearLayout implements OnCheckedChangeListener {
  private int checkedId = -1;
  private boolean protecting = false;
  private OnCheckedChangeListener onCheckedChangeListener;
  
  public CenteredContentToggleGroup(Context context) {
    super(context);
  }

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

  @SuppressLint("NewApi")
  public CenteredContentToggleGroup(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
  }
  
  @Override
  protected void onFinishInflate() {
    super.onFinishInflate();
    if (checkedId != -1) {
      protecting = true;
      setCheckedStateForView(checkedId, true);
      protecting = false;
      setCheckedId(checkedId);
    }
  }
  
  @Override
  public void addView(View child, int index, android.view.ViewGroup.LayoutParams params) {
    if (child instanceof CenteredContentToggleButton) {
      final CenteredContentToggleButton button = (CenteredContentToggleButton) child;
      button.setClickable(true);
      button.setOnCheckedChangeListener(this);
      
      if (button.isChecked()) {
        protecting = true;
              if (checkedId != -1) {
                setCheckedStateForView(checkedId, false);
              }
              protecting = false;
              
              int id = button.getId();
              if (id == View.NO_ID) {
                id = button.hashCode();
                button.setId(id);
              }
              
              setCheckedId(id);
      }
      
      super.addView(child, index, params);
    }  
  }

  public void check(int id) {
    if (id != -1 && (id == checkedId)) {
      return;
    }
    if (checkedId != -1) {
      setCheckedStateForView(checkedId, false);
    }
    if (id != -1) {
      setCheckedStateForView(id, true);
    }
    setCheckedId(id);
  }
  
  private void setCheckedId(int id) {
    checkedId = id;
    if (onCheckedChangeListener != null) {
      onCheckedChangeListener.onCheckedChanged(this, checkedId);
    }
  }
  
  private void setCheckedStateForView(int viewId, boolean checked) {
    View checkedView = findViewById(viewId);
    if (checkedView != null && checkedView instanceof CenteredContentToggleButton) {
      ((CenteredContentToggleButton) checkedView).setChecked(checked);
    }
  }
  
  public int getCheckedRadioButtonId() {
    return checkedId;
  }
  
  public void clearCheck() {
    check(-1);
  }
  
  public void setOnCheckedChangeListener(OnCheckedChangeListener onCheckedChangeListener) {
    this.onCheckedChangeListener = onCheckedChangeListener;
  }

  @Override
  public void onCheckedChanged(CenteredContentToggleButton btn) {
    if (protecting) {
      return;
    }
    
    int id = btn.getId();
    
    protecting = true;
    if (checkedId == id && !btn.isChecked()) { //do not allow to uncheck selected button by clicking on it
      setCheckedStateForView(checkedId, true);
      protecting = false;
      return; 
    }
    
    if (checkedId != -1) {
      setCheckedStateForView(checkedId, false);
    }
    protecting = false;
    
    setCheckedId(id);
  }

  public interface OnCheckedChangeListener {
    public void onCheckedChanged(CenteredContentToggleGroup group, int checkedId);
  }
}

Java Source Code List

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