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/*
* 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 android.app;
import android.os.Bundle;
import android.view.View;
import android.widget.TabHost;
import android.widget.TabWidget;
import android.widget.TextView;
/**
* 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(com.android.internal.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(com.android.internal.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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