1 /* 2 * Copyright (C) 2023 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.android.settings.fuelgauge.batteryusage; 18 19 import android.content.Context; 20 import android.os.Parcelable; 21 import android.util.AttributeSet; 22 import android.util.Log; 23 import android.widget.AdapterView; 24 import android.widget.Spinner; 25 26 import androidx.preference.Preference; 27 import androidx.preference.PreferenceViewHolder; 28 29 import com.android.internal.annotations.VisibleForTesting; 30 import com.android.settings.R; 31 import com.android.settingslib.widget.SettingsSpinnerAdapter; 32 33 /** A preference which contains a spinner. */ 34 public class SpinnerPreference extends Preference { 35 private static final String TAG = "SpinnerPreference"; 36 37 private AdapterView.OnItemSelectedListener mOnItemSelectedListener; 38 39 @VisibleForTesting 40 Spinner mSpinner; 41 @VisibleForTesting 42 String[] mItems; 43 @VisibleForTesting 44 int mSavedSpinnerPosition; 45 SpinnerPreference(Context context, AttributeSet attrs)46 public SpinnerPreference(Context context, AttributeSet attrs) { 47 super(context, attrs); 48 setLayoutResource(R.layout.preference_spinner); 49 } 50 initializeSpinner( String[] items, AdapterView.OnItemSelectedListener onItemSelectedListener)51 void initializeSpinner( 52 String[] items, AdapterView.OnItemSelectedListener onItemSelectedListener) { 53 mItems = items; 54 mOnItemSelectedListener = onItemSelectedListener; 55 } 56 57 @Override onBindViewHolder(PreferenceViewHolder view)58 public void onBindViewHolder(PreferenceViewHolder view) { 59 if (mSpinner != null) { 60 return; 61 } 62 63 mSpinner = (Spinner) view.findViewById(R.id.spinner); 64 mSpinner.setAdapter(new SpinnerAdapter(getContext(), mItems)); 65 mSpinner.setSelection(mSavedSpinnerPosition); 66 if (mOnItemSelectedListener != null) { 67 mSpinner.setOnItemSelectedListener(mOnItemSelectedListener); 68 } 69 } 70 71 @Override onSaveInstanceState()72 protected Parcelable onSaveInstanceState() { 73 if (mSpinner == null) { 74 return super.onSaveInstanceState(); 75 } 76 Log.d(TAG, "onSaveInstanceState() spinnerPosition=" + mSpinner.getSelectedItemPosition()); 77 return new SavedState(super.onSaveInstanceState(), mSpinner.getSelectedItemPosition()); 78 } 79 80 @Override onRestoreInstanceState(Parcelable state)81 protected void onRestoreInstanceState(Parcelable state) { 82 if (state == null || state == BaseSavedState.EMPTY_STATE) { 83 super.onRestoreInstanceState(state); 84 return; 85 } 86 if (!(state instanceof SavedState)) { 87 return; 88 } 89 SavedState savedState = (SavedState) state; 90 super.onRestoreInstanceState(savedState.getSuperState()); 91 mSavedSpinnerPosition = savedState.getSpinnerPosition(); 92 if (mOnItemSelectedListener != null) { 93 mOnItemSelectedListener.onItemSelected(/* parent= */null, /* view= */null, 94 savedState.getSpinnerPosition(), /* id= */ 0); 95 } 96 Log.d(TAG, "onRestoreInstanceState() spinnerPosition=" + savedState.getSpinnerPosition()); 97 } 98 99 @VisibleForTesting 100 static class SavedState extends BaseSavedState { 101 private int mSpinnerPosition; 102 SavedState(Parcelable superState, int spinnerPosition)103 SavedState(Parcelable superState, int spinnerPosition) { 104 super(superState); 105 mSpinnerPosition = spinnerPosition; 106 } 107 getSpinnerPosition()108 int getSpinnerPosition() { 109 return mSpinnerPosition; 110 } 111 } 112 113 private static class SpinnerAdapter extends SettingsSpinnerAdapter<CharSequence> { 114 private final String[] mItems; 115 SpinnerAdapter(Context context, String[] items)116 SpinnerAdapter(Context context, String[] items) { 117 super(context); 118 mItems = items; 119 } 120 121 @Override getCount()122 public int getCount() { 123 return mItems.length; 124 } 125 126 @Override getItem(int position)127 public CharSequence getItem(int position) { 128 return mItems[position]; 129 } 130 } 131 } 132