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.text.TextUtils;
21 import android.widget.LinearLayout;
22 import android.widget.TextView;
23 
24 import androidx.annotation.Nullable;
25 import androidx.appcompat.app.AppCompatActivity;
26 
27 import com.example.android.support.design.R;
28 import com.example.android.support.design.Shakespeare;
29 import com.google.android.material.bottomsheet.BottomSheetBehavior;
30 
31 /**
32  * This demonstrates basic usage of {@link BottomSheetBehavior}.
33  */
34 abstract class BottomSheetUsageBase extends AppCompatActivity {
35 
36     protected BottomSheetBehavior<LinearLayout> mBehavior;
37 
38     @Override
onCreate(@ullable Bundle savedInstanceState)39     protected void onCreate(@Nullable Bundle savedInstanceState) {
40         super.onCreate(savedInstanceState);
41         setContentView(getLayoutId());
42         ((TextView) findViewById(R.id.dialogue)).setText(TextUtils.concat(Shakespeare.DIALOGUE));
43         mBehavior = BottomSheetBehavior.from((LinearLayout) findViewById(R.id.bottom_sheet));
44     }
45 
46     @Override
onBackPressed()47     public void onBackPressed() {
48         if (mBehavior != null) {
49             int state = mBehavior.getState();
50             if (state != BottomSheetBehavior.STATE_COLLAPSED &&
51                     state != BottomSheetBehavior.STATE_HIDDEN) {
52                 mBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);
53                 return;
54             }
55         }
56         super.onBackPressed();
57     }
58 
getLayoutId()59     protected abstract int getLayoutId();
60 
61 }
62