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 17 package com.android.settings.slices; 18 19 import android.content.Context; 20 import android.net.Uri; 21 import android.util.Log; 22 23 import androidx.annotation.VisibleForTesting; 24 import androidx.lifecycle.LiveData; 25 import androidx.lifecycle.Observer; 26 import androidx.preference.PreferenceScreen; 27 import androidx.slice.Slice; 28 import androidx.slice.widget.SliceLiveData; 29 import androidx.slice.widget.SliceView; 30 31 import com.android.settings.core.BasePreferenceController; 32 import com.android.settingslib.core.lifecycle.LifecycleObserver; 33 import com.android.settingslib.core.lifecycle.events.OnStart; 34 import com.android.settingslib.core.lifecycle.events.OnStop; 35 36 /** 37 * Default {@link BasePreferenceController} for {@link SliceView}. It will take {@link Uri} for 38 * Slice and display what's inside this {@link Uri} 39 */ 40 public class SlicePreferenceController extends BasePreferenceController implements 41 LifecycleObserver, OnStart, OnStop, Observer<Slice> { 42 private static final String TAG = "SlicePreferenceController"; 43 @VisibleForTesting 44 LiveData<Slice> mLiveData; 45 @VisibleForTesting 46 SlicePreference mSlicePreference; 47 private Uri mUri; 48 SlicePreferenceController(Context context, String preferenceKey)49 public SlicePreferenceController(Context context, String preferenceKey) { 50 super(context, preferenceKey); 51 } 52 53 @Override displayPreference(PreferenceScreen screen)54 public void displayPreference(PreferenceScreen screen) { 55 super.displayPreference(screen); 56 mSlicePreference = screen.findPreference(getPreferenceKey()); 57 } 58 59 @Override getAvailabilityStatus()60 public int getAvailabilityStatus() { 61 return mUri != null ? AVAILABLE : UNSUPPORTED_ON_DEVICE; 62 } 63 setSliceUri(Uri uri)64 public void setSliceUri(Uri uri) { 65 mUri = uri; 66 mLiveData = SliceLiveData.fromUri(mContext, mUri, (int type, Throwable source) -> { 67 Log.w(TAG, "Slice may be null. uri = " + uri + ", error = " + type); 68 }); 69 70 //TODO(b/120803703): figure out why we need to remove observer first 71 mLiveData.removeObserver(this); 72 } 73 74 @Override onStart()75 public void onStart() { 76 if (mLiveData != null) { 77 mLiveData.observeForever(this); 78 } 79 } 80 81 @Override onStop()82 public void onStop() { 83 if (mLiveData != null) { 84 mLiveData.removeObserver(this); 85 } 86 } 87 88 @Override onChanged(Slice slice)89 public void onChanged(Slice slice) { 90 mSlicePreference.onSliceUpdated(slice); 91 } 92 } 93