Skeleton classes of my applications

skeleton_activity_BaseActivity.java

package ch.dotpay.skeleton.activity;

import android.Manifest;
import android.animation.Animator;
import android.app.Dialog;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.transition.TransitionInflater;
import android.util.Log;
import android.view.View;

import ch.dotpay.DotpayApplication;
import ch.dotpay.R;
import ch.dotpay.core.shared.ProviderWrapper;
import ch.dotpay.network.api.ApiFactory;
import ch.dotpay.network.model.ServerError;
import ch.dotpay.ui.fragment.GenericFragment;
import ch.dotpay.utils.AlertUtils;
import ch.dotpay.utils.GMSUtils;

/**
 * Created by gorodechnyj on 18.01.16.
 */
public class BaseActivity extends AppCompatActivity {
    private static final int REQUEST_LOCATION_PERMISSION = 4;
    private Handler handler = new Handler();
    private boolean mPaused = false;
    private View mProgressView;
    private Dialog mCurrentDialog;

    protected ProviderWrapper providerWrapper;
    protected DotpayApplication dotpayApplication;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        dotpayApplication = ((DotpayApplication) getApplication());
        providerWrapper = dotpayApplication.getProviderWrapper();
    }

    public void addFragment(final int containerResId, final Fragment fragment, final boolean addToBackStack) {
        handler.post(new Runnable() {
            @Override
            public void run() {
                if (!mPaused) {
                    final FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
                    ft.add(containerResId, fragment, fragment.getClass().getName());
                    if (addToBackStack) {
                        ft.addToBackStack(fragment.getClass().getName());
                    }
                    ft.commitAllowingStateLoss();
                }
            }
        });
    }

    public void replaceFragment(final int containerResId, final Fragment fragment, final boolean addToBackStack) {
        replaceFragment(containerResId, fragment, addToBackStack, false);
    }

    public void replaceFragment(final int containerResId, final Fragment fragment, final boolean addToBackStack, final boolean animate) {
        handler.post(new Runnable() {
            @Override
            public void run() {
                if (!mPaused) {
                    final FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
                    ft.replace(containerResId, fragment, fragment.getClass().getName());
                    if (animate) {
                        if (Build.VERSION.SDK_INT >= 21) {
                            fragment.setEnterTransition(TransitionInflater.from(BaseActivity.this)
                                    .inflateTransition(android.R.transition.slide_right));
                            fragment.setExitTransition(TransitionInflater.from(BaseActivity.this)
                                    .inflateTransition(android.R.transition.fade));
                        } else {
                            ft.setCustomAnimations(R.anim.slide_left_in, R.anim.slide_left_out, R.anim.slide_right_in, R.anim.slide_right_out);
                        }
                    }
                    if (addToBackStack) {
                        ft.addToBackStack(fragment.getClass().getName());
                    }
                    ft.commitAllowingStateLoss();
                }
            }
        });
    }

    @Override
    protected void onResume() {
        super.onResume();
        if (GMSUtils.checkLocationPermission(this, REQUEST_LOCATION_PERMISSION)) {
            dismissAlert();
            GMSUtils.checkGeolocationEnabled(this);
        }
    }

    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        mProgressView = findViewById(R.id.progressView);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        mPaused = true;
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == GMSUtils.GMS_REQUEST_GEO_LOCATION &&
                !GMSUtils.isGeolocationEnabled(this)) {
            finish();
        } else {
            super.onActivityResult(requestCode, resultCode, data);
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        if (requestCode == REQUEST_LOCATION_PERMISSION) {
            if (grantResults.length == 0
                    || grantResults[0] != PackageManager.PERMISSION_GRANTED) {
                if (!ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.ACCESS_FINE_LOCATION)) {
                    showAlert(AlertUtils.getAskPermissionDialog(BaseActivity.this,
                            getString(R.string.permissionRequired),
                            getString(R.string.locationPermissionRequired),
                            REQUEST_LOCATION_PERMISSION));
                }
            }
            return;
        }
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    }

    /**
     * Throbber, if used, shown above the any widgets and blocks user actions.
     */
    public void showThrobber() {
        if (mProgressView != null && !mPaused) {
            mProgressView.animate()
                    .alpha(1f)
                    .setDuration(200)
                    .setListener(new Animator.AnimatorListener() {
                        @Override
                        public void onAnimationStart(Animator animation) {
                            mProgressView.setVisibility(View.VISIBLE);
                        }

                        @Override
                        public void onAnimationEnd(Animator animation) {
                        }

                        @Override
                        public void onAnimationCancel(Animator animation) {
                        }

                        @Override
                        public void onAnimationRepeat(Animator animation) {
                        }
                    });
        }
    }

    public void hideThrobber() {
        if (mProgressView != null && !mPaused) {
            mProgressView.animate()
                    .alpha(0f)
                    .setDuration(200)
                    .setListener(new Animator.AnimatorListener() {
                        @Override
                        public void onAnimationStart(Animator animation) {
                        }

                        @Override
                        public void onAnimationEnd(Animator animation) {
                            mProgressView.setVisibility(View.GONE);
                        }

                        @Override
                        public void onAnimationCancel(Animator animation) {
                        }

                        @Override
                        public void onAnimationRepeat(Animator animation) {
                        }
                    });
        }
    }

    public boolean isThrobberShown() {
        return mProgressView != null && mProgressView.getVisibility() == View.VISIBLE;
    }

    public View getThrobber() {
        return mProgressView;
    }

    public void showAlert(Dialog dialog) {
        dismissAlert();
        mCurrentDialog = dialog;
        mCurrentDialog.show();
    }

    public void dismissAlert() {
        if (mCurrentDialog != null) {
            mCurrentDialog.dismiss();
            mCurrentDialog = null;
        }
    }
}

skeleton_binding_BindingAttributes.java

package ch.dotpay.skeleton.binding;

import android.content.Context;
import android.databinding.BindingAdapter;
import android.graphics.Typeface;
import android.support.design.widget.TextInputLayout;
import android.text.Editable;
import android.text.TextUtils;
import android.text.TextWatcher;
import android.util.Pair;
import android.view.View;
import android.widget.AdapterView;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;

import com.squareup.picasso.Picasso;

import java.util.HashMap;

import ch.dotpay.R;
import ch.dotpay.skeleton.util.CircleTransformation;

/**
 * Created by Belozerow on 11.10.2015.
 */
public class BindingAttributes {
    private static HashMap<String, Typeface> typefaceHashMap = new HashMap<>();

    @BindingAdapter({"bind:circleUrl"})
    public static void setCircleUrl(ImageView imageView, String url) {
        if (url == null)
            return;
        Picasso.with(imageView.getContext()).load(url).transform(new CircleTransformation()).into(imageView);
    }

    @BindingAdapter({"bind:imageUrl"})
    public static void setImageUrl(ImageView imageView, String url) {
        if (url == null)
            return;
        Picasso.with(imageView.getContext()).load(url).into(imageView);
    }

    @BindingAdapter("bind:typeface")
    public static void setTypeface(TextView textView, String font) {
        Typeface tf = typefaceHashMap.get(font);
        if (tf == null) {
            tf = Typeface.createFromAsset(textView.getContext().getAssets(), "fonts/" + font);
            typefaceHashMap.put(font, tf);
        }
        textView.setTypeface(tf);
    }

    @BindingAdapter({"bind:imageRes"})
    public static void setImageRes(ImageView imageView, int res) {
        imageView.setImageResource(res);
    }

    @BindingAdapter({"bind:imageResName"})
    public static void setImageResName(ImageView imageView, String resName) {
        Context context = imageView.getContext();
        if (TextUtils.isEmpty(resName)) {
            return;
        }
        int id = context.getResources().getIdentifier(resName, "drawable", context.getPackageName());
        imageView.setImageResource(id);
    }

    @BindingAdapter({"bind:twoWayText"})
    public static void bindEditText(EditText view,
                                    final ObservableString observableString) {
        Pair<ObservableString, TextWatcher> pair =
                (Pair) view.getTag(R.id.bound_observable);
        if (pair == null || pair.first != observableString) {
            if (pair != null) {
                view.removeTextChangedListener(pair.second);
            }
            TextWatcher watcher = new TextWatcher() {
                @Override
                public void beforeTextChanged(CharSequence s, int start, int count, int after) {

                }

                public void onTextChanged(CharSequence s,
                                          int start, int before, int count) {
                    observableString.set(s.toString());
                }

                @Override
                public void afterTextChanged(Editable s) {

                }
            };
            view.setTag(R.id.bound_observable,
                    new Pair<>(observableString, watcher));
            view.addTextChangedListener(watcher);
        }
        if (observableString != null) {
            String newValue = observableString.get();
            if (!view.getText().toString().equals(newValue)) {
                view.setText(newValue);
            }
        }
        if (view.getParent() != null
                && view.getParent() instanceof TextInputLayout) {
            ((TextInputLayout) view.getParent()).refreshDrawableState();
        }
    }

//    @BindingAdapter("app:swipeEnabled")
//    public static void setLayoutWidth(SwipeLayout view, boolean enabled) {
//        view.setSwipeEnabled(enabled);
//    }


//    @BindingAdapter({"app:twoWayBoolean"})
//    public static void bindCheckBox(CheckBox view, final ObservableBoolean observableBoolean) {
//        if (observableBoolean != null) {
//            if (view.getTag(R.id.bound_observable) != observableBoolean) {
//                view.setTag(R.id.bound_observable, observableBoolean);
//                view.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
//                    @Override
//                    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
//                        observableBoolean.set(isChecked);
//                    }
//                });
//            }
//            boolean newValue = observableBoolean.get();
//            if (view.isChecked() != newValue) {
//                view.setChecked(newValue);
//            }
//        }
//    }
//
//    @BindingAdapter({"app:twoWaySpinner"})
//    public static void bindSpinner(final Spinner spinner, final ObservableString observable) {
//        if (observable != null) {
//            if (spinner.getTag(R.id.bound_observable) != observable) {
//                spinner.setTag(R.id.bound_observable, observable);
//                spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
//                    @Override
//                    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
//                        observable.set((String) spinner.getItemAtPosition(position));
//                    }
//
//                    @Override
//                    public void onNothingSelected(AdapterView<?> parent) {
//
//                    }
//                });
//            }
//            String newValue = observable.get();
//            if (newValue == null)
//                return;
//            if (!observable.equals(spinner.getSelectedItem())) {
//                SpinnerAdapter spinnerAdapter = spinner.getAdapter();
//                int selectedItem = spinner.getSelectedItemPosition();
//                if (spinnerAdapter != null) {
//                    for (int i = 0; i < spinnerAdapter.getCount(); i++) {
//                        if (newValue.equals(spinnerAdapter.getItem(i))) {
//                            selectedItem = i;
//                            break;
//                        }
//                    }
//                }
//                spinner.setSelection(selectedItem);
//            }
//
//        }
//    }

//    @BindingAdapter({"android:entries"})
//    public static void setFriendsSpinner(Spinner spinner, ArrayList<Friend> items) {
//        ArrayList<String> strings = new ArrayList<>();
//        for (Friend item : items) {
//            strings.add(item.userName.get());
//        }
//        ArrayAdapter<String> adapter = new ArrayAdapter<>(spinner.getContext(), R.layout.item_friends_spinner, strings);
//        spinner.setAdapter(adapter);
//    }

    @BindingAdapter({"bind:error"})
    public static void setTextInputError(TextInputLayout textInputLayout, String error) {
        if (TextUtils.isEmpty(error)) {
            textInputLayout.setError(null);
        } else {
            textInputLayout.setError(error);
        }
    }

    @BindingAdapter({"bind:error"})
    public static void setTextInputError(TextInputLayout textInputLayout, int errorResId) {
        if (errorResId == 0) {
            textInputLayout.setError(null);
        } else {
            textInputLayout.setError(textInputLayout.getContext().getResources().getString(errorResId));
        }
    }

    @BindingAdapter({"bind:onActionDone"})
    public static void setOnDoneListener(EditText editText, TextView.OnEditorActionListener listener) {
        editText.setOnEditorActionListener(listener);
    }

    @BindingAdapter({"bind:onLongClick"})
    public static void setOnLongClickListener(View view, View.OnLongClickListener listener) {
        view.setOnLongClickListener(listener);
    }

    @BindingAdapter({"bind:onItemLongClick"})
    public static void setOnLongClickListener(AdapterView view, AdapterView.OnItemLongClickListener listener) {
        view.setOnItemLongClickListener(listener);
    }

    @BindingAdapter({"app:onItemClick"})
    public static void setOnItemClickListener(AdapterView view, AdapterView.OnItemClickListener listener) {
        view.setOnItemClickListener(listener);
    }

    @BindingAdapter({"app:visibility"})
    public static void setVisibility(View view, boolean isVisible) {
        view.setVisibility(isVisible ? View.VISIBLE : View.GONE);
    }
}

skeleton_binding_DataBindingUtils.java

package ch.dotpay.skeleton.binding;

import android.databinding.ViewDataBinding;
import android.view.LayoutInflater;
import android.view.ViewGroup;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * Created by Belozerow on 29.11.2015.
 */
public class DataBindingUtils {
    public static ViewDataBinding getViewDataBinding(Class clazz, LayoutInflater inflater, ViewGroup container) {
        Method method = null;
        try {
            method = clazz.getMethod("inflate", LayoutInflater.class, ViewGroup.class, boolean.class);
            return (ViewDataBinding) method.invoke(null, inflater, container, false);
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
        return null;
    }
}

skeleton_binding_ObservableString.java

package ch.dotpay.skeleton.binding;

import android.databinding.BaseObservable;
import android.databinding.BindingConversion;
import android.os.Parcel;
import android.os.Parcelable;

import java.io.Serializable;

/**
 * Created: Belozerov
 * Company: APPGRANULA LLC
 * Date: 15.01.2016
 */

public class ObservableString extends BaseObservable implements Parcelable, Serializable {
    static final long serialVersionUID = 1L;
    private String mValue;
    public static final Creator<ObservableString> CREATOR = new Creator<ObservableString>() {
        public ObservableString createFromParcel(Parcel source) {
            return new ObservableString(source.readString());
        }

        public ObservableString[] newArray(int size) {
            return new ObservableString[size];
        }
    };

    public ObservableString(String value) {
        this.mValue = value;
    }

    public ObservableString() {
    }

    public String get() {
        return this.mValue;
    }

    public void set(String value) {
        if (!equals(value, this.mValue)) {
            this.mValue = value;
            this.notifyChange();
        }

    }

    public static boolean equals(Object a, Object b) {
        return (a == b) || (a != null && a.equals(b));
    }

    public int describeContents() {
        return 0;
    }

    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(this.mValue);
    }

    public boolean isEmpty() {
        return mValue == null || mValue.isEmpty();
    }

    @BindingConversion
    public static String convertToString(ObservableString s) {
        return s.get();
    }
}

skeleton_fragment_BaseFragment.java

package ch.dotpay.skeleton.fragment;

import android.databinding.ViewDataBinding;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;

import ch.dotpay.DotpayApplication;
import ch.dotpay.R;
import ch.dotpay.core.FragmentLauncher;
import ch.dotpay.core.shared.ProviderWrapper;
import ch.dotpay.pref.UserPref;
import ch.dotpay.skeleton.activity.BaseActivity;
import ch.dotpay.skeleton.binding.DataBindingUtils;

/**
 * Created: gorodechnyj
 * Date: 27.03.2016
 */
public abstract class BaseFragment<T extends ViewDataBinding> extends Fragment {
    private final Class<T> typeParameterClass;
    protected T binding;
    public static final String ADD_TO_BACK_STACK = "add_to_back_stack";

    public abstract String getTitle();

    protected DotpayApplication dotpayApplication;
    protected ProviderWrapper providerWrapper;
    protected UserPref userPref;

    protected ActionBar actionBar;

    public BaseFragment(Class<T> typeParameterClass) {
        super();
        this.typeParameterClass = typeParameterClass;
    }

    public String getFragmentTag() {
        Class<?> enclosingClass = getClass().getEnclosingClass();
        if (enclosingClass != null) {
            return enclosingClass.getName();
        } else {
            return getClass().getName();
        }
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        dotpayApplication = ((DotpayApplication) getActivity().getApplication());
        providerWrapper = dotpayApplication.getProviderWrapper();
        userPref = UserPref.with(getActivity());

        setHasOptionsMenu(true);
    }

    public BaseActivity getBaseActivity() {
        return (BaseActivity) getActivity();
    }

    private boolean isBackStack() {
        return getArguments().getBoolean(ADD_TO_BACK_STACK);
    }

    @Override
    public void onResume() {
        super.onResume();
        setTitle(getTitle());
    }

    protected void setTitle(String title) {
        if (actionBar != null)
            actionBar.setTitle(title);
    }

    protected ActionBar getSupportActionBar() {
        return ((AppCompatActivity) getActivity()).getSupportActionBar();
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getItemId() == android.R.id.home) {
            getFragmentManager().popBackStack();
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        binding = (T) DataBindingUtils.getViewDataBinding(typeParameterClass, inflater, container);
        View view = binding.getRoot();
        Toolbar toolbar = (Toolbar) view.findViewById(R.id.toolbar);
        if (toolbar != null) {
            getBaseActivity().setSupportActionBar(toolbar);
        }
        actionBar = getSupportActionBar();
        return view;
    }
    
    public boolean onBackPressed() {
        return false;
    }
}

skeleton_util_CircleTransformation.java

package ch.dotpay.skeleton.util;

import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Paint;

import com.squareup.picasso.Transformation;

public class CircleTransformation implements Transformation {
    @Override
    public Bitmap transform(Bitmap source) {
        int size = Math.min(source.getWidth(), source.getHeight());

        int x = (source.getWidth() - size) / 2;
        int y = (source.getHeight() - size) / 2;

        Bitmap squaredBitmap = Bitmap.createBitmap(source, x, y, size, size);
        if (squaredBitmap != source) {
            source.recycle();
        }

        Bitmap bitmap = Bitmap.createBitmap(size, size, source.getConfig());

        Canvas canvas = new Canvas(bitmap);
        Paint paint = new Paint();
        BitmapShader shader = new BitmapShader(squaredBitmap, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP);
        paint.setShader(shader);
        paint.setAntiAlias(true);

        float r = size / 2f;
        canvas.drawCircle(r, r, r, paint);

        squaredBitmap.recycle();
        return bitmap;
    }

    @Override
    public String key() {
        return "circle";
    }
}

skeleton_widget_CursorRecyclerViewAdapter.java

package ch.dotpay.skeleton.widget;
/*
 * Copyright (C) 2014 skyfish.jy@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.
 *
 */

import android.content.Context;
import android.database.Cursor;
import android.database.DataSetObserver;
import android.support.v7.widget.RecyclerView;

/**
 * Created by skyfishjy on 10/31/14.
 */

public abstract class CursorRecyclerViewAdapter<VH extends RecyclerView.ViewHolder> extends RecyclerView.Adapter<VH> {

    protected Context mContext;

    private Cursor mCursor;

    private boolean mDataValid;

    private int mRowIdColumn;

    private DataSetObserver mDataSetObserver;

    public CursorRecyclerViewAdapter(Context context, Cursor cursor) {
        mContext = context;
        mCursor = cursor;
        mDataValid = cursor != null;
        mRowIdColumn = mDataValid ? mCursor.getColumnIndex("_id") : -1;
        mDataSetObserver = new NotifyingDataSetObserver();
        if (mCursor != null) {
            mCursor.registerDataSetObserver(mDataSetObserver);
        }
    }

    public Cursor getCursor() {
        return mCursor;
    }

    @Override
    public int getItemCount() {
        if (mDataValid && mCursor != null) {
            return mCursor.getCount();
        }
        return 0;
    }

    @Override
    public long getItemId(int position) {
        if (mDataValid && mCursor != null && mCursor.moveToPosition(position)) {
            return mCursor.getLong(mRowIdColumn);
        }
        return 0;
    }

    @Override
    public void setHasStableIds(boolean hasStableIds) {
        super.setHasStableIds(true);
    }

    public abstract void onBindViewHolder(VH viewHolder, Cursor cursor, int position);

    @Override
    public void onBindViewHolder(VH viewHolder, int position) {
        if (!mDataValid) {
            throw new IllegalStateException("this should only be called when the cursor is valid");
        }
        if (!mCursor.moveToPosition(position)) {
            throw new IllegalStateException("couldn't move cursor to position " + position);
        }
        onBindViewHolder(viewHolder, mCursor, position);
    }

    /**
     * Change the underlying cursor to a new cursor. If there is an existing cursor it will be
     * closed.
     */
    public void changeCursor(Cursor cursor) {
        Cursor old = swapCursor(cursor);
        if (old != null) {
            old.close();
        }
    }

    /**
     * Swap in a new Cursor, returning the old Cursor.  Unlike
     * {@link #changeCursor(Cursor)}, the returned old Cursor is <em>not</em>
     * closed.
     */
    public Cursor swapCursor(Cursor newCursor) {
        if (newCursor == mCursor) {
            return null;
        }
        final Cursor oldCursor = mCursor;
        if (oldCursor != null && mDataSetObserver != null) {
            oldCursor.unregisterDataSetObserver(mDataSetObserver);
        }
        mCursor = newCursor;
        if (mCursor != null) {
            if (mDataSetObserver != null) {
                mCursor.registerDataSetObserver(mDataSetObserver);
            }
            mRowIdColumn = newCursor.getColumnIndexOrThrow("_id");
            mDataValid = true;
            notifyDataSetChanged();
        } else {
            mRowIdColumn = -1;
            mDataValid = false;
            notifyDataSetChanged();
            //There is no notifyDataSetInvalidated() method in RecyclerView.Adapter
        }
        return oldCursor;
    }

    private class NotifyingDataSetObserver extends DataSetObserver {
        @Override
        public void onChanged() {
            super.onChanged();
            mDataValid = true;
            notifyDataSetChanged();
        }

        @Override
        public void onInvalidated() {
            super.onInvalidated();
            mDataValid = false;
            notifyDataSetChanged();
            //There is no notifyDataSetInvalidated() method in RecyclerView.Adapter
        }
    }
}

skeleton_widget_CustomInsetsFrameLayout.java

package ch.dotpay.skeleton.widget;

import android.content.Context;
import android.os.Build;
import android.util.AttributeSet;
import android.view.WindowInsets;
import android.widget.FrameLayout;

/**
 * @author Kevin
 *         Date Created: 3/7/14
 *         <p/>
 *         https://code.google.com/p/android/issues/detail?id=63777
 *         <p/>
 *         When using a translucent status bar on API 19+, the window will not
 *         resize to make room for input methods (i.e.
 *         {@link android.view.WindowManager.LayoutParams#SOFT_INPUT_ADJUST_RESIZE} and
 *         {@link android.view.WindowManager.LayoutParams#SOFT_INPUT_ADJUST_PAN} are
 *         ignored).
 *         <p/>
 *         To work around this; override {@link #fitSystemWindows(android.graphics.Rect)},
 *         capture and override the system insets, and then call through to LinearLayout's
 *         implementation.
 *         <p/>
 *         For reasons yet unknown, modifying the bottom inset causes this workaround to
 *         fail. Modifying the top, left, and right insets works as expected.
 */
public final class CustomInsetsFrameLayout extends FrameLayout {
    private int[] mInsets = new int[4];

    public CustomInsetsFrameLayout(Context context) {
        super(context);
    }

    public CustomInsetsFrameLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public CustomInsetsFrameLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public final int[] getInsets() {
        return mInsets;
    }

    @Override
    public final WindowInsets onApplyWindowInsets(WindowInsets insets) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT_WATCH) {
            mInsets[0] = insets.getSystemWindowInsetLeft();
            mInsets[1] = insets.getSystemWindowInsetTop();
            mInsets[2] = insets.getSystemWindowInsetRight();
            return super.onApplyWindowInsets(insets.replaceSystemWindowInsets(0, 0, 0,
                    insets.getSystemWindowInsetBottom()));
        } else {
            return insets;
        }
    }
}

skeleton_widget_CustomInsetsLinearLayout.java

package ch.dotpay.skeleton.widget;

import android.content.Context;
import android.os.Build;
import android.util.AttributeSet;
import android.view.WindowInsets;
import android.widget.LinearLayout;

/**
 * @author Kevin
 *         Date Created: 3/7/14
 *         <p/>
 *         https://code.google.com/p/android/issues/detail?id=63777
 *         <p/>
 *         When using a translucent status bar on API 19+, the window will not
 *         resize to make room for input methods (i.e.
 *         {@link android.view.WindowManager.LayoutParams#SOFT_INPUT_ADJUST_RESIZE} and
 *         {@link android.view.WindowManager.LayoutParams#SOFT_INPUT_ADJUST_PAN} are
 *         ignored).
 *         <p/>
 *         To work around this; override {@link #fitSystemWindows(android.graphics.Rect)},
 *         capture and override the system insets, and then call through to LinearLayout's
 *         implementation.
 *         <p/>
 *         For reasons yet unknown, modifying the bottom inset causes this workaround to
 *         fail. Modifying the top, left, and right insets works as expected.
 */
public final class CustomInsetsLinearLayout extends LinearLayout {
    private int[] mInsets = new int[4];

    public CustomInsetsLinearLayout(Context context) {
        super(context);
    }

    public CustomInsetsLinearLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public CustomInsetsLinearLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public final int[] getInsets() {
        return mInsets;
    }

    @Override
    public final WindowInsets onApplyWindowInsets(WindowInsets insets) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT_WATCH) {
            mInsets[0] = insets.getSystemWindowInsetLeft();
            mInsets[1] = insets.getSystemWindowInsetTop();
            mInsets[2] = insets.getSystemWindowInsetRight();
            return super.onApplyWindowInsets(insets.replaceSystemWindowInsets(0, 0, 0,
                    insets.getSystemWindowInsetBottom()));
        } else {
            return insets;
        }
    }
}

skeleton_widget_ItemClickableRecyclerViewAdapter.java

package ch.dotpay.skeleton.widget;

import android.support.v7.widget.RecyclerView;

/**
 * Created by gorodechnyj on 30.03.2016.
 */
public abstract class ItemClickableRecyclerViewAdapter<VH extends RecyclerView.ViewHolder> extends RecyclerView.Adapter<VH> {


    @Override
    public void onBindViewHolder(VH holder, int position) {

    }
}