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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.os.Handler;
     21 import android.text.TextUtils;
     22 import android.view.Menu;
     23 import android.view.MenuItem;
     24 import android.widget.TextView;
     25 
     26 import androidx.appcompat.app.AppCompatActivity;
     27 import androidx.appcompat.widget.Toolbar;
     28 import androidx.recyclerview.widget.LinearLayoutManager;
     29 import androidx.recyclerview.widget.RecyclerView;
     30 import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
     31 
     32 import com.example.android.support.design.Cheeses;
     33 import com.example.android.support.design.R;
     34 import com.example.android.support.design.Shakespeare;
     35 import com.google.android.material.appbar.AppBarLayout;
     36 import com.google.android.material.appbar.CollapsingToolbarLayout;
     37 import com.google.android.material.tabs.TabLayout;
     38 
     39 import java.util.Random;
     40 
     41 abstract class AppBarLayoutUsageBase extends AppCompatActivity {
     42 
     43     @Override
     44     protected void onCreate(Bundle savedInstanceState) {
     45         super.onCreate(savedInstanceState);
     46         setContentView(getLayoutId());
     47 
     48         // Retrieve the Toolbar from our content view, and set it as the action bar
     49         Toolbar toolbar = findViewById(R.id.toolbar);
     50         setSupportActionBar(toolbar);
     51 
     52         CollapsingToolbarLayout collapsingToolbarLayout = (CollapsingToolbarLayout)
     53                 findViewById(R.id.collapsing_app_bar);
     54         if (collapsingToolbarLayout != null) {
     55             if (displayTitle()) {
     56                 collapsingToolbarLayout.setTitle(getTitle());
     57             }
     58             collapsingToolbarLayout.setContentScrimColor(0xFFFF00FF);
     59         }
     60 
     61         TextView dialog = findViewById(R.id.textview_dialogue);
     62         if (dialog != null) {
     63             dialog.setText(TextUtils.concat(Shakespeare.DIALOGUE));
     64         }
     65 
     66         RecyclerView recyclerView = findViewById(R.id.appbar_recyclerview);
     67         if (recyclerView != null) {
     68             setupRecyclerView(recyclerView);
     69         }
     70 
     71         TabLayout tabLayout = findViewById(R.id.tabs);
     72         if (tabLayout != null) {
     73             setupTabs(tabLayout);
     74         }
     75 
     76         final SwipeRefreshLayout refreshLayout = findViewById(R.id.swiperefresh);
     77         if (refreshLayout != null) {
     78             refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
     79                 private final Handler mHandler = new Handler();
     80 
     81                 @Override
     82                 public void onRefresh() {
     83                     // Post a delayed runnable to reset the refreshing state in 2 seconds
     84                     mHandler.postDelayed(new Runnable() {
     85                         @Override
     86                         public void run() {
     87                             refreshLayout.setRefreshing(false);
     88                         }
     89                     }, 2000);
     90                 }
     91             });
     92         }
     93     }
     94 
     95     @Override
     96     public boolean onCreateOptionsMenu(Menu menu) {
     97         getMenuInflater().inflate(R.menu.sample_actions, menu);
     98         return true;
     99     }
    100 
    101     @Override
    102     public boolean onOptionsItemSelected(MenuItem item) {
    103         switch (item.getItemId()) {
    104             case R.id.action_toggle_expand: {
    105                 AppBarLayout abl = findViewById(R.id.app_bar);
    106                 abl.setExpanded(true);
    107                 return true;
    108             }
    109             case R.id.action_toggle_collapse: {
    110                 AppBarLayout abl = findViewById(R.id.app_bar);
    111                 abl.setExpanded(false);
    112                 return true;
    113             }
    114         }
    115         return super.onOptionsItemSelected(item);
    116     }
    117 
    118     private void addRandomTab(TabLayout tabLayout) {
    119         Random r = new Random();
    120         String cheese = Cheeses.sCheeseStrings[r.nextInt(Cheeses.sCheeseStrings.length)];
    121         tabLayout.addTab(tabLayout.newTab().setText(cheese));
    122     }
    123 
    124     private void setupTabs(TabLayout tabLayout) {
    125         for (int i = 0; i < 10; i++) {
    126             addRandomTab(tabLayout);
    127         }
    128     }
    129 
    130     private void setupRecyclerView(RecyclerView recyclerView) {
    131         recyclerView.setLayoutManager(new LinearLayoutManager(recyclerView.getContext()));
    132         recyclerView.setAdapter(new SimpleStringRecyclerViewAdapter(this, Cheeses.sCheeseStrings));
    133     }
    134 
    135     protected boolean displayTitle() {
    136         return true;
    137     }
    138 
    139     protected abstract int getLayoutId();
    140 
    141 }
    142