org.droidparts.activity.TabbedFragmentActivity.java Source code

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Here is the source code for org.droidparts.activity.TabbedFragmentActivity.java

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/**
 * Copyright 2012 Alex Yanchenko
 * 
 * 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.droidparts.activity;

import static com.actionbarsherlock.app.ActionBar.NAVIGATION_MODE_TABS;

import java.util.ArrayList;
import java.util.HashSet;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;

import com.actionbarsherlock.app.ActionBar;
import com.actionbarsherlock.app.ActionBar.Tab;
import com.actionbarsherlock.app.ActionBar.TabListener;

public abstract class TabbedFragmentActivity extends FragmentActivity {

    private static final String CURR_TAB = "_curr_tab";

    private final ArrayList<int[]> fragmentsOnTab = new ArrayList<int[]>();

    private final HashSet<Integer> manuallyHiddenFragments = new HashSet<Integer>();

    private final TabListener tabListener = new TabListener() {

        @Override
        public void onTabSelected(Tab tab, FragmentTransaction ft) {
            showFragmentsForCurrentTab(ft);
            onTabChanged(getCurrentTab());
        }

        @Override
        public void onTabUnselected(Tab tab, FragmentTransaction ft) {
            // NA
        }

        @Override
        public void onTabReselected(Tab tab, FragmentTransaction ft) {
            // NA
        }
    };

    private int enterAnimation, exitAnimation;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getSupportActionBar().setNavigationMode(NAVIGATION_MODE_TABS);
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putInt(CURR_TAB, getCurrentTab());
    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        setCurrentTab(savedInstanceState.getInt(CURR_TAB, 0));
    }

    public void addTab(ActionBar.Tab tab, int[] fragmentIds) {
        addTab(fragmentsOnTab.size(), tab, fragmentIds);
    }

    public void addTab(int position, ActionBar.Tab tab, int[] fragmentIds) {
        tab.setTabListener(tabListener);
        getSupportActionBar().addTab(tab, position);
        fragmentsOnTab.add(position, fragmentIds);
        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
        showFragmentsForCurrentTab(ft);
        ft.commit();
    }

    public void setCustomAnimations(int enter, int exit) {
        this.enterAnimation = enter;
        this.exitAnimation = exit;
    }

    public void setCurrentTab(int position) {
        getSupportActionBar().setSelectedNavigationItem(position);
    }

    public int getCurrentTab() {
        return getSupportActionBar().getSelectedTab().getPosition();
    }

    protected void onTabChanged(int position) {

    }

    @Override
    public void setFragmentVisible(int fragmentId, boolean visible) {
        // set visible only if it's on current tab
        if (visible) {
            manuallyHiddenFragments.remove(fragmentId);
            int[] currTabFragments = fragmentsOnTab.get(getCurrentTab());
            for (int fId : currTabFragments) {
                if (fId == fragmentId) {
                    super.setFragmentVisible(fragmentId, true);
                    break;
                }
            }
        } else {
            manuallyHiddenFragments.add(fragmentId);
            super.setFragmentVisible(fragmentId, false);
        }
    }

    private void showFragmentsForCurrentTab(FragmentTransaction ft) {
        int currTabPos = getCurrentTab();
        FragmentManager fm = getSupportFragmentManager();
        if (enterAnimation != 0 && exitAnimation != 0) {
            ft.setCustomAnimations(enterAnimation, exitAnimation);
        }
        for (int tabPos = 0; tabPos < fragmentsOnTab.size(); tabPos++) {
            boolean isCurrTab = (tabPos == currTabPos);
            int[] tabFragments = fragmentsOnTab.get(tabPos);
            for (int fragmentId : tabFragments) {
                Fragment fragment = fm.findFragmentById(fragmentId);
                if (fragment != null) {
                    if (isCurrTab) {
                        if (!manuallyHiddenFragments.contains(fragmentId)) {
                            ft.show(fragment);
                        }
                    } else {
                        ft.hide(fragment);
                    }
                }
            }
        }
    }
}