EhViewer/app/src/main/java/com/hippo/ehviewer/ui/SettingsActivity.java

/*
 * Copyright 2016 Hippo Seven
 *
 * 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.hippo.ehviewer.ui;

import android.app.Fragment;
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.support.annotation.StringRes;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarDrawerToggle;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListAdapter;

import com.hippo.ehviewer.R;
import com.hippo.ehviewer.ui.fragment.AboutFragment;
import com.hippo.ehviewer.ui.fragment.DownloadFragment;
import com.hippo.ehviewer.ui.fragment.EhFragment;
import com.hippo.ehviewer.ui.fragment.ReadFragment;
import com.hippo.util.DrawableManager;

import java.lang.reflect.Field;
import java.util.List;

public final class SettingsActivity extends TrackedPreferenceActivity {

    private static final int REQUEST_CODE_FRAGMENT = 0;

    private static final String[] ENTRY_FRAGMENTS = {
            EhFragment.class.getName(),
            ReadFragment.class.getName(),
            DownloadFragment.class.getName(),
            AboutFragment.class.getName(),
    };

    private class FakeLayoutInflater extends LayoutInflater {

        private final LayoutInflater mInflater;

        protected FakeLayoutInflater(LayoutInflater inflater) {
            super(null);
            mInflater = inflater;
        }

        @Override
        public LayoutInflater cloneInContext(Context newContext) {
            return null;
        }

        @Override
        public View inflate(int resource, ViewGroup root, boolean attachToRoot) {
            return mInflater.inflate(R.layout.item_preference_header, root, attachToRoot);
        }
    }

    @SuppressWarnings("TryWithIdenticalCatches")
    private void replaceHeaderLayoutResId() {
        try {
            ListAdapter adapter = getListAdapter();
            Class headerAdapterClazz = Class.forName("android.preference.PreferenceActivity$HeaderAdapter");
            if (!headerAdapterClazz.isInstance(adapter)) {
                return;
            }

            boolean ok = false;

            // For lollipop and above this work
            try {
                Field field = headerAdapterClazz.getDeclaredField("mLayoutResId");
                field.setAccessible(true);
                field.setInt(adapter, R.layout.item_preference_header);

                ok = true;
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            } catch (NoSuchFieldException e) {
                e.printStackTrace();
            }

            // For pre-lollipop this work
            if (!ok) {
                try {
                    Field field = headerAdapterClazz.getDeclaredField("mInflater");
                    field.setAccessible(true);
                    field.set(adapter, new FakeLayoutInflater((LayoutInflater) field.get(adapter)));

                    ok = true;
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                } catch (NoSuchFieldException e) {
                    e.printStackTrace();
                } catch (ClassCastException e) {
                    e.printStackTrace();
                }
            }

            if (ok) {
                getListView().setDivider(new ColorDrawable(Color.TRANSPARENT));
                getListView().setDividerHeight(0);
            }

        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }

    private void setActionBarUpIndicator(Drawable drawable) {
        ActionBarDrawerToggle.Delegate delegate = getDrawerToggleDelegate();
        if (delegate != null) {
            delegate.setActionBarUpIndicator(drawable, 0);
        }
        ActionBar actionBar = getSupportActionBar();
        if (actionBar != null) {
            actionBar.setDisplayHomeAsUpEnabled(true);
            actionBar.setHomeButtonEnabled(true);
        }
    }

    @SuppressWarnings("deprecation")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setActionBarUpIndicator(DrawableManager.getDrawable(this, R.drawable.v_arrow_left_dark_x24));

        replaceHeaderLayoutResId();
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                finish();
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }

    @Override
    public void onBuildHeaders(List<Header> target) {
        loadHeadersFromResource(R.xml.settings_headers, target);
    }

    @Override
    public void startWithFragment(String fragmentName, Bundle args,
            Fragment resultTo, int resultRequestCode, @StringRes int titleRes,
            @StringRes int shortTitleRes) {
        Intent intent = onBuildStartFragmentIntent(fragmentName, args, titleRes, shortTitleRes);
        if (resultTo == null) {
            startActivityForResult(intent, REQUEST_CODE_FRAGMENT);
        } else {
            resultTo.startActivityForResult(intent, resultRequestCode);
        }
    }

    @Override
    protected boolean isValidFragment(String fragmentName) {
        for (String fragment : ENTRY_FRAGMENTS) {
            if (fragment.equals(fragmentName)) {
                return true;
            }
        }
        return false;
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == REQUEST_CODE_FRAGMENT) {
            if (resultCode == RESULT_OK) {
                setResult(RESULT_OK, data);
            }
        } else {
            super.onActivityResult(requestCode, resultCode, data);
        }
    }
}