Java 类android.support.v7.preference.PreferenceGroupAdapter 实例源码

@Override public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    setDivider(ActivityCompat.getDrawable(getActivity(), R.drawable.list_divider));
    setDividerHeight(1);
    PreferenceGroupAdapter adapter = (PreferenceGroupAdapter) getListView().getAdapter();
    for (int i = 0; i < getListView().getAdapter().getItemCount(); i++) {//lazy global setOnPreferenceClickListener
        Preference preference = adapter.getItem(i);
        if (preference != null && !InputHelper.isEmpty(preference.getKey())) {
            if (preference.getKey().equalsIgnoreCase("version")) {
                preference.setSummary(BuildConfig.VERSION_NAME);
            } else if (!(preference instanceof SwitchPreference) && !(preference instanceof ListPreference)) {
                preference.setOnPreferenceClickListener(this);
            }
        }
    }
}

public static int getPreferencePosition(PreferenceGroupAdapter adapter,
                                        Class<? extends Preference> clazz) {
    for (int i = 0; i < adapter.getItemCount(); i++) {
        if (clazz.isInstance(adapter.getItem(i))) {
            return i;
        }
    }
    throw new Resources.NotFoundException();
}

@Before
public void setUp() {
    controller = Robolectric.buildActivity(PreferencesActivity.class);
    activity = controller.withIntent(new Intent()
            .putExtra(PreferencesActivity.EXTRA_TITLE, R.string.display)
            .putExtra(PreferencesActivity.EXTRA_PREFERENCES, R.xml.preferences_display))
            .create().start().resume().visible().get();
    RecyclerView list = (RecyclerView) activity.findViewById(R.id.list);
    list.setLayoutManager(new LinearLayoutManager(activity));
    RecyclerView.Adapter adapter = list.getAdapter();
    int position = ShadowSupportPreferenceManager
            .getPreferencePosition((PreferenceGroupAdapter) adapter, ThemePreference.class);
    RecyclerView.ViewHolder holder = CustomShadows.customShadowOf(adapter).getViewHolder(position);
    preferenceView = holder.itemView;
}

@Before
public void setUp() {
    controller = Robolectric.buildActivity(PreferencesActivity.class);
    activity = controller.withIntent(new Intent()
            .putExtra(PreferencesActivity.EXTRA_TITLE, R.string.display)
            .putExtra(PreferencesActivity.EXTRA_PREFERENCES, R.xml.preferences_display))
            .create().postCreate(null).start().resume().visible().get();
    RecyclerView list = (RecyclerView) activity.findViewById(R.id.list);
    list.setLayoutManager(new LinearLayoutManager(activity));
    RecyclerView.Adapter adapter = list.getAdapter();
    int position = ShadowSupportPreferenceManager
            .getPreferencePosition((PreferenceGroupAdapter) adapter, FontPreference.class);
    RecyclerView.ViewHolder holder = CustomShadows.customShadowOf(adapter).getViewHolder(position);
    preferenceView = holder.itemView;
}

@Before
public void setUp() {
    controller = Robolectric.buildActivity(PreferencesActivity.class);
    activity = controller.withIntent(new Intent()
            .putExtra(PreferencesActivity.EXTRA_TITLE, R.string.display)
            .putExtra(PreferencesActivity.EXTRA_PREFERENCES, R.xml.preferences_display))
            .create().postCreate(null).start().resume().visible().get();
    RecyclerView list = (RecyclerView) activity.findViewById(R.id.list);
    list.setLayoutManager(new LinearLayoutManager(activity));
    RecyclerView.Adapter adapter = list.getAdapter();
    int position = ShadowSupportPreferenceManager
            .getPreferencePosition((PreferenceGroupAdapter) adapter, FontSizePreference.class);
    RecyclerView.ViewHolder holder = CustomShadows.customShadowOf(adapter).getViewHolder(position);
    preferenceView = holder.itemView;
}

@Override
protected RecyclerView.Adapter onCreateAdapter(PreferenceScreen preferenceScreen) {
    return new PreferenceGroupAdapter(preferenceScreen) {
        @Override
        public void onBindViewHolder(PreferenceViewHolder holder, int position) {
            super.onBindViewHolder(holder, position);

            // Override Equalizer preference attachment to add a long click listener
            // and to change the detail text at runtime
            String fragment = getItem(position).getFragment();
            if ("com.marverenic.music.ui.settings.EqualizerFragment".equals(fragment)) {

                ViewGroup itemView = (ViewGroup) holder.itemView;
                TextView title = (TextView) itemView.findViewById(android.R.id.title);
                TextView detail = (TextView) itemView.findViewById(android.R.id.summary);

                boolean hasSystemEq = Util.getSystemEqIntent(getContext()) != null;

                if (hasSystemEq && Util.hasEqualizer()) {
                    // If we have Jockey's Equalizer and another Equalizer
                    itemView.setOnLongClickListener(PreferenceFragment.this);
                    detail.setText(R.string.equalizer_more_options_detail);
                    detail.setVisibility(View.VISIBLE);

                } else if (hasSystemEq && !Util.hasEqualizer()) {
                    // If we don't have any equalizers
                    detail.setText(R.string.equalizer_unsupported);
                    detail.setVisibility(View.VISIBLE);
                    itemView.setEnabled(false);
                    title.setEnabled(false);
                    detail.setEnabled(false);
                }
            }
        }
    };
}

/**
 * Return a valid ListView position or -1 if none is found
 */
private int canUseListViewForHighLighting(String key) {
    if (getListView() == null) {
        return -1;
    }

    RecyclerView listView = getListView();
    RecyclerView.Adapter adapter = listView.getAdapter();

    if (adapter != null && adapter instanceof PreferenceGroupAdapter) {
        return findListPositionFromKey((PreferenceGroupAdapter) adapter, key);
    }

    return -1;
}

private int findListPositionFromKey(PreferenceGroupAdapter adapter, String key) {
    final int count = adapter.getItemCount();
    for (int n = 0; n < count; n++) {
        final Preference preference = adapter.getItem(n);
        final String preferenceKey = preference.getKey();
        if (preferenceKey != null && preferenceKey.equals(key)) {
            return n;
        }
    }
    return -1;
}

@Override
public void onDrawOver(Canvas c, RecyclerView parent,
        RecyclerView.State state) {
    int left = parent.getPaddingLeft();
    int right = parent.getWidth() - parent.getPaddingRight();

    final PreferenceGroupAdapter adapter =
            (PreferenceGroupAdapter) parent.getAdapter();
    final int adapterCount = adapter.getItemCount();

    boolean wasLastPreferenceGroup = false;
    for (int i = 0, childCount = parent.getChildCount(); i < childCount;
            i++) {
        final View child = parent.getChildAt(i);

        final int adapterPosition = parent.getChildAdapterPosition(child);
        Preference preference = adapter.getItem(adapterPosition);

        boolean skipNextAboveDivider = false;
        if (adapterPosition == 0) {
            if (mDrawTop) {
                drawAbove(c, left, right, child);
            }
            skipNextAboveDivider = true;
        }

        if (preference instanceof PreferenceGroup
                && !(preference instanceof PreferenceScreen)) {
            if (mDrawBetweenCategories) {
                if (!skipNextAboveDivider) {
                    drawAbove(c, left, right, child);
                    skipNextAboveDivider = true;
                }
            }
            wasLastPreferenceGroup = true;
        } else {
            if (mDrawBetweenItems && !wasLastPreferenceGroup) {
                if (!skipNextAboveDivider) {
                    drawAbove(c, left, right, child);
                    skipNextAboveDivider = true;
                }
            }
            wasLastPreferenceGroup = false;
        }

        if (adapterPosition == adapterCount - 1) {
            if (mDrawBottom) {
                drawBottom(c, left, right, child);
            }
        }
    }
}

@Override
public void onDrawOver(Canvas c, RecyclerView parent,
        RecyclerView.State state) {
    int left = parent.getPaddingLeft();
    int right = parent.getWidth() - parent.getPaddingRight();

    final PreferenceGroupAdapter adapter =
            (PreferenceGroupAdapter) parent.getAdapter();
    final int adapterCount = adapter.getItemCount();

    boolean wasLastPreferenceGroup = false;
    for (int i = 0, childCount = parent.getChildCount(); i < childCount;
            i++) {
        final View child = parent.getChildAt(i);

        final int adapterPosition = parent.getChildAdapterPosition(child);
        Preference preference = adapter.getItem(adapterPosition);

        boolean skipNextAboveDivider = false;
        if (adapterPosition == 0) {
            if (mDrawTop) {
                drawAbove(c, left, right, child);
            }
            skipNextAboveDivider = true;
        }

        if (preference instanceof PreferenceGroup
                && !(preference instanceof PreferenceScreen)) {
            if (mDrawBetweenCategories) {
                if (!skipNextAboveDivider) {
                    drawAbove(c, left, right, child);
                    skipNextAboveDivider = true;
                }
            }
            wasLastPreferenceGroup = true;
        } else {
            if (mDrawBetweenItems && !wasLastPreferenceGroup) {
                if (!skipNextAboveDivider) {
                    drawAbove(c, left, right, child);
                    skipNextAboveDivider = true;
                }
            }
            wasLastPreferenceGroup = false;
        }

        if (adapterPosition == adapterCount - 1) {
            if (mDrawBottom) {
                drawBottom(c, left, right, child);
            }
        }
    }
}