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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.example.android.support.design.widget;
     18 
     19 import android.os.Bundle;
     20 import android.util.TypedValue;
     21 import android.view.MenuItem;
     22 import android.view.View;
     23 
     24 import androidx.appcompat.widget.Toolbar;
     25 import androidx.core.view.GravityCompat;
     26 import androidx.drawerlayout.widget.DrawerLayout;
     27 
     28 import com.example.android.support.design.R;
     29 import com.google.android.material.navigation.NavigationView;
     30 
     31 /**
     32  * This demonstrates basic usage of NavigationView
     33  */
     34 public class NavigationViewUsage extends NavigationViewUsageBase {
     35 
     36     private DrawerLayout mDrawerLayout;
     37 
     38     @Override
     39     protected void onCreate(Bundle savedInstanceState) {
     40         super.onCreate(savedInstanceState);
     41 
     42         mDrawerLayout = findViewById(R.id.drawer_layout);
     43 
     44         // Set the color of status bar
     45         TypedValue value = new TypedValue();
     46         getTheme().resolveAttribute(R.attr.colorPrimaryDark, value, true);
     47         mDrawerLayout.setStatusBarBackgroundColor(value.data);
     48 
     49         // Retrieve the Toolbar from our content view, and set it as the action bar
     50         Toolbar toolbar = findViewById(R.id.toolbar);
     51         setSupportActionBar(toolbar);
     52 
     53         // Toggle icon
     54         toolbar.setNavigationIcon(R.drawable.ic_action_navigation_menu);
     55         toolbar.setNavigationOnClickListener(new View.OnClickListener() {
     56             @Override
     57             public void onClick(View view) {
     58                 mDrawerLayout.openDrawer(GravityCompat.START);
     59             }
     60         });
     61     }
     62 
     63     @Override
     64     protected int getLayout() {
     65         return R.layout.design_navigation;
     66     }
     67 
     68     @Override
     69     public NavigationView.OnNavigationItemSelectedListener getNavigationItemSelectedListener() {
     70         return new NavigationView.OnNavigationItemSelectedListener() {
     71             @Override
     72             public boolean onNavigationItemSelected(MenuItem item) {
     73                 if (handleNavigationItemSelected(item)) {
     74                     mDrawerLayout.closeDrawers();
     75                     return true;
     76                 }
     77                 return false;
     78             }
     79         };
     80     }
     81 
     82     @Override
     83     public void onBackPressed() {
     84         if (mDrawerLayout.isDrawerOpen(GravityCompat.START)) {
     85             mDrawerLayout.closeDrawer(GravityCompat.START);
     86         } else {
     87             super.onBackPressed();
     88         }
     89     }
     90 
     91 }
     92