com.android.fastexample.adapter.FragmentTabAdapter.java Source code

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Here is the source code for com.android.fastexample.adapter.FragmentTabAdapter.java

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/*
 * Copyright (C) 2014 loQua.Xee <loquaciouser@gmail.com>
 *
 * 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.android.fastexample.adapter;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.widget.RadioGroup;

import com.android.fastexample.R;

import java.util.List;

/**
 * Do one thing at a time, and do well!
 *
 * @Prject: FastAndroid
 * @Location: com.android.fastexample.adapter.FragmentTabAdapter
 * @Description: TODO
 * @author: LoQua.Xee    loquaciouser@gmail.com
 * @date: 2014/9/3 17:09
 * @version: V1.0
 */

public class FragmentTabAdapter implements RadioGroup.OnCheckedChangeListener {
    private List<Fragment> fragments; // tab?Fragment
    private RadioGroup rgs; // ?tab
    private FragmentActivity fragmentActivity; // FragmentActivity
    private int fragmentContentId; // Activity??id

    private int currentTab; // ?Tab?

    private OnRgsExtraCheckedChangedListener onRgsExtraCheckedChangedListener; //
    // ?tab

    public FragmentTabAdapter(FragmentActivity fragmentActivity, List<Fragment> fragments, int fragmentContentId,
            RadioGroup rgs) {
        this.fragments = fragments;
        this.rgs = rgs;
        this.fragmentActivity = fragmentActivity;
        this.fragmentContentId = fragmentContentId;

        // 
        FragmentTransaction ft = fragmentActivity.getSupportFragmentManager().beginTransaction();
        ft.add(fragmentContentId, fragments.get(0));
        ft.commit();
        rgs.setOnCheckedChangeListener(this);
    }

    @Override
    public void onCheckedChanged(RadioGroup radioGroup, int checkedId) {
        for (int i = 0; i < rgs.getChildCount(); i++) {
            if (rgs.getChildAt(i).getId() == checkedId) {
                Fragment fragment = fragments.get(i);
                FragmentTransaction ft = obtainFragmentTransaction(i);

                getCurrentFragment().onPause();

                if (fragment.isAdded()) {
                    fragment.onResume();
                } else {
                    ft.add(fragmentContentId, fragment);
                }
                showTab(i);
                ft.commit();

                // ?tab??
                if (null != onRgsExtraCheckedChangedListener) {
                    onRgsExtraCheckedChangedListener.OnRgsExtraCheckedChanged(radioGroup, checkedId, i);
                }

            }
        }

    }

    /**
     * ?tab
     *
     * @param idx
     */
    private void showTab(int idx) {
        for (int i = 0; i < fragments.size(); i++) {
            Fragment fragment = fragments.get(i);
            FragmentTransaction ft = obtainFragmentTransaction(idx);

            if (idx == i) {
                ft.show(fragment);
            } else {
                ft.hide(fragment);
            }
            ft.commit();
        }
        currentTab = idx; // tab?tab
    }

    /**
     * ?FragmentTransaction
     *
     * @param index
     * @return
     */
    private FragmentTransaction obtainFragmentTransaction(int index) {
        FragmentTransaction ft = fragmentActivity.getSupportFragmentManager().beginTransaction();
        // ?
        if (index > currentTab) {
            ft.setCustomAnimations(R.anim.slide_left_in, R.anim.slide_left_out);
        } else {
            ft.setCustomAnimations(R.anim.slide_right_in, R.anim.slide_right_out);
        }
        return ft;
    }

    public int getCurrentTab() {
        return currentTab;
    }

    public Fragment getCurrentFragment() {
        return fragments.get(currentTab);
    }

    public OnRgsExtraCheckedChangedListener getOnRgsExtraCheckedChangedListener() {
        return onRgsExtraCheckedChangedListener;
    }

    public void setOnRgsExtraCheckedChangedListener(
            OnRgsExtraCheckedChangedListener onRgsExtraCheckedChangedListener) {
        this.onRgsExtraCheckedChangedListener = onRgsExtraCheckedChangedListener;
    }

    /**
     * ?tab??
     */
    public static abstract class OnRgsExtraCheckedChangedListener {
        public abstract void OnRgsExtraCheckedChanged(RadioGroup radioGroup, int checkedId, int index);
    }
}