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 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 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 59 protected abstract int getLayoutId(); 60 61 } 62
