com.zepan.android.widget.TabGroup.java Source code

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Here is the source code for com.zepan.android.widget.TabGroup.java

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/*
 * Copyright (C) 2014-10-14 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 com.zepan.android.widget;

import java.util.ArrayList;
import java.util.List;

import android.content.Context;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.widget.LinearLayout;

/**
 * ???LinearLayout?Tab??ActivityActivity
 * XML???attachContent(Fragment ...)?tabfragment?
 * 
 * @author zhanglei
 * @version 1.0
 * @date 2014-10-14
 */
public class TabGroup extends LinearLayout {

    private static final String TAG = "TabGroup";
    private FragmentManager frmMgr = null;
    private Fragment[] mStoredFragments = null;
    private int mContentResId = 0;
    /**
     * Fragment??
     * */
    private List<Class<? extends Fragment>> mFrmCls = new ArrayList<Class<? extends Fragment>>();

    /**
     * @param context
     * @param attrs
     */
    public TabGroup(Context context, AttributeSet attrs) {
        super(context, attrs);
        FragmentActivity ac = (FragmentActivity) context;
        frmMgr = ac.getSupportFragmentManager();
    }

    public void attachContent(int contentId, Class<? extends Fragment>... frmCls) {
        if (contentId == 0) {
            Log.w(TAG, "invalid content id");
            return;
        }
        this.mContentResId = contentId;
        if (frmCls == null || frmCls.length == 0) {
            Log.w(TAG, "?Fragment?");
        }

        for (Class<? extends Fragment> c : frmCls) {
            mFrmCls.add(c);
        }
        mStoredFragments = new Fragment[mFrmCls.size()];
        defineEvent();
    }

    public Fragment getFragment(int index) {
        return mStoredFragments[index];
    }

    public void setCurrentView(int index) {
        if (mStoredFragments[index] == null) {
            try {
                // instantiate the fragment by the class at the [index] of
                // showFrms
                mStoredFragments[index] = mFrmCls.get(index).newInstance();
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        // get a fragment transaction and store it.
        FragmentTransaction trac = frmMgr.beginTransaction().setCustomAnimations(android.R.anim.fade_in,
                android.R.anim.fade_out);
        Fragment currentFragment = mStoredFragments[index];

        if (currentFragment != null) {

            // if the fragment is not added,add it to layout,else show it.
            if (!currentFragment.isAdded()) {
                trac.add(mContentResId, currentFragment);
            } else {
                trac.show(currentFragment);
            }
        }
        // hide other fragments.
        for (int i = 0; i < mStoredFragments.length; i++) {
            if (i != index && mStoredFragments[i] != null) {
                trac.hide(mStoredFragments[i]);
            }
        }
        //      trac.addToBackStack(null);
        trac.commit();
        setSelected(getChildAt(index));
    }

    private void defineEvent() {
        for (int i = 0; i < getChildCount(); i++) {
            final View view = getChildAt(i);
            view.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    setCurrentView(getIndex(v));
                }
            });
        }
    }

    private void setSelected(View view) {
        for (int i = 0; i < getChildCount(); i++) {
            View v = getChildAt(i);
            v.setSelected(v == view);
        }
    }

    public int getSelectedIndex() {
        for (int i = 0; i < getChildCount(); i++) {
            if (getChildAt(i).isSelected()) {
                return i;
            }
        }
        return 0;
    }

    public int getIndex(View view) {
        for (int i = 0; i < getChildCount(); i++) {
            View v = getChildAt(i);
            if (v == view) {
                return i;
            }
        }
        return 0;
    }
}