Android Open Source - mvfa Tab Activity

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License

The source code is released under:

GNU General Public License

Java Source Code

/* Modifications to use the included copies of TabHost and TabWidget
 * instead of in-built Android versions.
 * /*from  w  w  w.  j a va 2s .  c o m*/
 * Modifications Copyright (C) 2009 Justin Shapcott, nEx.Software
 *
 * 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.
 */

/* Original Copyright Information
 * 
 * Copyright (C) 2006 The Android Open Source Project
 *
 * 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 my.android.app;

import my.android.widget.TabHost;
import my.android.widget.TabWidget;
import android.app.Activity;
import android.app.ActivityGroup;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import be.benvd.mvforandroid.R;

/**
 * An activity that contains and runs multiple embedded activities or views.
 */
public class TabActivity extends ActivityGroup
  {
  private TabHost mTabHost;
  private String mDefaultTab = null;
  private int mDefaultTabIndex = -1;

  public TabActivity()
    {
    }

  /**
   * Sets the default tab that is the first tab highlighted.
   * 
   * @param tag
   *            the name of the default tab
   */
  public void setDefaultTab(String tag)
    {
    mDefaultTab = tag;
    mDefaultTabIndex = -1;
    }

  /**
   * Sets the default tab that is the first tab highlighted.
   * 
   * @param index
   *            the index of the default tab
   */
  public void setDefaultTab(int index)
    {
    mDefaultTab = null;
    mDefaultTabIndex = index;
    }

  @Override
  protected void onRestoreInstanceState(Bundle state)
    {
    super.onRestoreInstanceState(state);
    ensureTabHost();
    String cur = state.getString("currentTab");
    if(cur != null)
      {
      mTabHost.setCurrentTabByTag(cur);
      }
    if(mTabHost.getCurrentTab() < 0)
      {
      if(mDefaultTab != null)
        {
        mTabHost.setCurrentTabByTag(mDefaultTab);
        }
      else if(mDefaultTabIndex >= 0)
        {
        mTabHost.setCurrentTab(mDefaultTabIndex);
        }
      }
    }

  @Override
  protected void onPostCreate(Bundle icicle)
    {
    super.onPostCreate(icicle);

    ensureTabHost();

    if(mTabHost.getCurrentTab() == -1)
      {
      mTabHost.setCurrentTab(0);
      }
    }

  @Override
  protected void onSaveInstanceState(Bundle outState)
    {
    super.onSaveInstanceState(outState);
    String currentTabTag = mTabHost.getCurrentTabTag();
    if(currentTabTag != null)
      {
      outState.putString("currentTab", currentTabTag);
      }
    }

  /**
   * Updates the screen state (current list and other views) when the content
   * changes.
   * 
   * @see Activity#onContentChanged()
   */
  @Override
  public void onContentChanged()
    {
    super.onContentChanged();
    mTabHost = (TabHost) findViewById(android.R.id.tabhost);

    if(mTabHost == null)
      {
      throw new RuntimeException("Your content must have a TabHost whose id attribute is " + "'android.R.id.tabhost'");
      }
    mTabHost.setup(getLocalActivityManager());
    }

  private void ensureTabHost()
    {
    if(mTabHost == null)
      {
      this.setContentView(R.layout.tab_content);
      }
    }

  @Override
  protected void onChildTitleChanged(Activity childActivity, CharSequence title)
    {
    // Dorky implementation until we can have multiple activities running.
    if(getLocalActivityManager().getCurrentActivity() == childActivity)
      {
      View tabView = mTabHost.getCurrentTabView();
      if(tabView != null && tabView instanceof TextView)
        {
        ((TextView) tabView).setText(title);
        }
      }
    }

  /**
   * Returns the {@link TabHost} the activity is using to host its tabs.
   * 
   * @return the {@link TabHost} the activity is using to host its tabs.
   */
  public TabHost getTabHost()
    {
    ensureTabHost();
    return mTabHost;
    }

  /**
   * Returns the {@link TabWidget} the activity is using to draw the actual
   * tabs.
   * 
   * @return the {@link TabWidget} the activity is using to draw the actual
   *         tabs.
   */
  public TabWidget getTabWidget()
    {
    return mTabHost.getTabWidget();
    }
  }

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