1 /* 2 * Copyright (C) 2018 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 package com.example.android.intentplayground; 17 18 import android.content.Context; 19 import android.view.LayoutInflater; 20 import android.view.View; 21 import android.view.ViewGroup; 22 import android.widget.Button; 23 import android.widget.TextView; 24 25 import androidx.viewpager.widget.PagerAdapter; 26 27 import java.util.List; 28 29 /** 30 * A {@link PagerAdapter} for {@link ShowcaseFragment} that handles the creation of Views based 31 * on a list of {@link com.example.android.intentplayground.ShowcaseFragment.Step}. 32 */ 33 class StepAdapter extends PagerAdapter { 34 private final Context mContext; 35 private View.OnClickListener mNextCallback; 36 private View.OnClickListener mCancelCallback; 37 private View.OnClickListener mFinishCallback; 38 private List<ShowcaseFragment.Step> mSteps; 39 private LayoutInflater mInflater; 40 41 /** 42 * Constructs a new StepAdapter. 43 * @param context The context that holds this adapter. 44 * @param steps A list of {@link com.example.android.intentplayground.ShowcaseFragment.Step}s 45 */ 46 public StepAdapter(Context context, List<ShowcaseFragment.Step> steps) { 47 mContext = context; 48 mSteps = steps; 49 mInflater = LayoutInflater.from(mContext); 50 } 51 52 /** 53 * Set the callbacks to be run when pager buttons are clicked. 54 * @param finish The method to run when the finish action is requested. 55 * @param cancel The method to run when the cancel action is requested. 56 * @param next The method to run when the next action is requested. 57 */ 58 public void setButtonCallbacks(View.OnClickListener finish, View.OnClickListener cancel, 59 View.OnClickListener next) { 60 mFinishCallback = finish; 61 mCancelCallback = cancel; 62 mNextCallback = next; 63 } 64 65 @Override 66 public Object instantiateItem(ViewGroup container, int position) { 67 ShowcaseFragment.Step currentStep = getStep(position); 68 ViewGroup skeletonLayout = (ViewGroup) mInflater 69 .inflate(R.layout.showcase_skeleton, container, false /* attachToRoot */); 70 TextView tutorialText = skeletonLayout.findViewById(R.id.tutorial_text); 71 tutorialText.setText(mContext.getString(currentStep.tutorialText)); 72 Button cancelButton = skeletonLayout.findViewById(R.id.cancel_pager); 73 Button nextButton = skeletonLayout.findViewById(R.id.next_pager); 74 if (position == getCount() - 1) { 75 // last item, adjust button bar 76 cancelButton.setVisibility(View.GONE); 77 nextButton.setText(R.string.help_step_finish); 78 nextButton.setOnClickListener(mFinishCallback); 79 } else { 80 cancelButton.setOnClickListener(mCancelCallback); 81 nextButton.setOnClickListener(mNextCallback); 82 } 83 container.addView(skeletonLayout); 84 return skeletonLayout; 85 } 86 87 @Override 88 public void destroyItem(ViewGroup container, int position, Object view) { 89 container.removeView((View) view); 90 } 91 92 public ShowcaseFragment.Step getStep(int i) { 93 return mSteps.get(i); 94 } 95 96 @Override 97 public int getCount() { 98 return mSteps.size(); 99 } 100 101 @Override 102 public boolean isViewFromObject(View view, Object o) { 103 return view.equals(o); 104 } 105 } 106
