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 17package com.example.android.support.design.widget; 18 19import com.example.android.support.design.R; 20import com.example.android.support.design.Shakespeare; 21 22import android.os.Bundle; 23import android.support.annotation.Nullable; 24import android.support.design.widget.BottomSheetBehavior; 25import android.support.v7.app.AppCompatActivity; 26import android.text.TextUtils; 27import android.widget.LinearLayout; 28import android.widget.TextView; 29 30/** 31 * This demonstrates basic usage of {@link BottomSheetBehavior}. 32 */ 33abstract class BottomSheetUsageBase extends AppCompatActivity { 34 35 protected BottomSheetBehavior<LinearLayout> mBehavior; 36 37 @Override 38 protected void onCreate(@Nullable Bundle savedInstanceState) { 39 super.onCreate(savedInstanceState); 40 setContentView(getLayoutId()); 41 ((TextView) findViewById(R.id.dialogue)).setText(TextUtils.concat(Shakespeare.DIALOGUE)); 42 mBehavior = BottomSheetBehavior.from((LinearLayout) findViewById(R.id.bottom_sheet)); 43 } 44 45 @Override 46 public void onBackPressed() { 47 if (mBehavior != null) { 48 int state = mBehavior.getState(); 49 if (state != BottomSheetBehavior.STATE_COLLAPSED && 50 state != BottomSheetBehavior.STATE_HIDDEN) { 51 mBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED); 52 return; 53 } 54 } 55 super.onBackPressed(); 56 } 57 58 protected abstract int getLayoutId(); 59 60} 61