com.martin.designlibrary.MainActivity.java Source code

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Here is the source code for com.martin.designlibrary.MainActivity.java

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/*
 * Copyright (C) 2015 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.martin.designlibrary;

import android.os.Bundle;
import android.support.design.widget.NavigationView;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;

public class MainActivity extends AppCompatActivity {

    private DrawerLayout mDrawerLayout;
    private int mSelected, mCurrent;
    private NavigationView mNavigationView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if (savedInstanceState != null) {
            mSelected = savedInstanceState.getInt("mSelected");
            mCurrent = savedInstanceState.getInt("mCurrent");
        } else {
            mCurrent = -1;
            mSelected = 0;
        }

        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);

        mDrawerLayout.setDrawerListener(new DrawerLayout.DrawerListener() {
            @Override
            public void onDrawerSlide(View drawerView, float slideOffset) {
            }

            @Override
            public void onDrawerOpened(View drawerView) {
            }

            @Override
            public void onDrawerStateChanged(int newState) {
            }

            @Override
            public void onDrawerClosed(View drawerView) {
                updateContainer();
            }
        });

        mNavigationView = (NavigationView) findViewById(R.id.nav_view);
        if (mNavigationView != null) {
            setupDrawerContent(mNavigationView);
        }

        selectDrawerItem(mSelected);
    }

    private void selectDrawerItem(int i) {
        mNavigationView.getMenu().getItem(i).setChecked(true);
        updateContainer();
    }

    private void updateContainer() {
        FragmentManager fragmentManager = getSupportFragmentManager();
        Fragment fragment = null;
        if (mSelected != mCurrent) {
            switch (mSelected) {
            case 0:
                fragment = TabFragment.newInstance();
                break;
            case 1:
                fragment = CollapsingFragment.newInstance();
                break;
            }
            mCurrent = mSelected;
            fragmentManager.beginTransaction().replace(R.id.container, fragment).commit();
        }
    }

    private void setupDrawerContent(final NavigationView navigationView) {
        navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(MenuItem menuItem) {
                switch (menuItem.getItemId()) {
                case R.id.nav_home:
                    mSelected = 0;
                    break;
                case R.id.nav_messages:
                    mSelected = 1;
                    break;
                }
                menuItem.setChecked(true);
                mDrawerLayout.closeDrawers();
                return true;
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

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

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        outState.putInt("mSelected", mSelected);
        outState.putInt("mCurrent", mCurrent);
        super.onSaveInstanceState(outState);
    }
}