com.grokkingandroid.sampleapp.samples.SampleBaseFragment.java Source code

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Here is the source code for com.grokkingandroid.sampleapp.samples.SampleBaseFragment.java

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/*
 * Copyright (C) 2014 Wolfram Rittmeyer
 *
 * 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.grokkingandroid.sampleapp.samples;

import android.annotation.SuppressLint;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.text.Html;
import android.text.Spanned;
import android.text.method.LinkMovementMethod;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.LinearLayout;
import android.widget.TextView;

import com.grokkingandroid.sampleapp.samples.gcm.R;

public abstract class SampleBaseFragment extends Fragment {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setHasOptionsMenu(true);
    }

    @SuppressLint("NewApi")
    protected void showLinks(ViewGroup container) {
        String[] linkTexts = getLinkTexts();
        String[] linkTargets = getLinkTargets();
        StringBuilder link = null;
        for (int i = 0; i < linkTexts.length; i++) {
            // TODO: Use an inflater
            TextView tv = new TextView(getActivity());
            LinearLayout.LayoutParams params = null;
            params = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
            if (i != linkTexts.length - 1) {
                int marginBottom = getResources().getDimensionPixelSize(R.dimen.linkSpacing);
                params.setMargins(0, 0, 0, marginBottom);
            }
            tv.setLayoutParams(params);
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
                tv.setTextIsSelectable(true);
            }
            tv.setTextAppearance(getActivity(), android.R.style.TextAppearance_Medium);
            link = new StringBuilder(100);
            link.append("<a href=\"");
            link.append(linkTargets[i]);
            link.append("\">");
            link.append(linkTexts[i]);
            link.append("</a>");
            Spanned spannedLink = Html.fromHtml(link.toString());
            tv.setText(spannedLink);
            tv.setMovementMethod(LinkMovementMethod.getInstance());
            container.addView(tv);
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_demo_base, container, false);
        if (isFragmentWithInlineDescription()) {
            TextView description = (TextView) rootView.findViewById(R.id.demoapp_fragment_description);
            Spanned descSpannable = Html.fromHtml(getResources().getString(getDescriptionTextId()));
            description.setText(descSpannable);
            description.setMovementMethod(LinkMovementMethod.getInstance());
            ViewGroup linkContainer = (ViewGroup) rootView.findViewById(R.id.container_demo_blog_links);
            showLinks(linkContainer);
            linkContainer.invalidate();
        } else {
            rootView.findViewById(R.id.container_demo_description).setVisibility(View.GONE);
            rootView.findViewById(R.id.container_demo_blog_links).setVisibility(View.GONE);
        }

        // delegate to subclass for content view
        ViewGroup contentContainer = (ViewGroup) rootView.findViewById(R.id.container_demo_content);
        onCreateContentView(inflater, contentContainer, savedInstanceState);
        return rootView;
    }

    public abstract String[] getLinkTexts();

    public abstract String[] getLinkTargets();

    public void onCreateContentView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        //TODO: temporary solution;
        // either generate it or do it in a better way
        // works for now, though
        container.setVisibility(View.GONE);
    }

    /**
     * Fragments without any visibile content should return true. In this
     * case the description will be presented inline. Otherwise
     * the description will be displayed after the user has selected
     * the corresponding menu item in the action bar.
     * <br><br>
     * By default this method returns false.
     */
    public boolean isFragmentWithInlineDescription() {
        return false;
    }

    public abstract int getDescriptionTextId();

    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        if (isFragmentWithInlineDescription()) {
            menu.findItem(R.id.menu_description).setVisible(false);
        }
        addFragmentSpecificMenu(menu, inflater);
    }

    protected abstract void addFragmentSpecificMenu(Menu menu, MenuInflater inflater);

}