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/*
* Copyright 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.app.slice.widget;
import android.arch.lifecycle.LiveData;
import android.content.Context;
import android.content.Intent;
import android.database.ContentObserver;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Handler;
import android.support.annotation.NonNull;
import java.util.Arrays;
import java.util.List;
import androidx.app.slice.Slice;
import androidx.app.slice.SliceSpec;
/**
* Class with factory methods for creating LiveData that observes slices.
*
* @see #fromUri(Context, Uri)
* @see LiveData
*/
public final class SliceLiveData {
private static final List<SliceSpec> SUPPORTED_SPECS = Arrays.asList();
/**
* Produces an {@link LiveData} that tracks a Slice for a given Uri. To use
* this method your app must have the permission to the slice Uri or hold
* {@link android.Manifest.permission#BIND_SLICE}).
*/
public static LiveData<Slice> fromUri(Context context, Uri uri) {
return new SliceLiveDataImpl(context.getApplicationContext(), uri);
}
/**
* Produces an {@link LiveData} that tracks a Slice for a given Intent. To use
* this method your app must have the permission to the slice Uri or hold
* {@link android.Manifest.permission#BIND_SLICE}).
*/
public static LiveData<Slice> fromIntent(@NonNull Context context, @NonNull Intent intent) {
return new SliceLiveDataImpl(context.getApplicationContext(), intent);
}
private static class SliceLiveDataImpl extends LiveData<Slice> {
private final Context mContext;
private final Intent mIntent;
private Uri mUri;
private SliceLiveDataImpl(Context context, Uri uri) {
super();
mContext = context;
mUri = uri;
mIntent = null;
// TODO: Check if uri points at a Slice?
}
private SliceLiveDataImpl(Context context, Intent intent) {
super();
mContext = context;
mUri = null;
mIntent = intent;
}
@Override
protected void onActive() {
AsyncTask.execute(mUpdateSlice);
if (mUri != null) {
mContext.getContentResolver().registerContentObserver(mUri, false, mObserver);
}
}
@Override
protected void onInactive() {
if (mUri != null) {
mContext.getContentResolver().unregisterContentObserver(mObserver);
}
}
private final Runnable mUpdateSlice = new Runnable() {
@Override
public void run() {
Slice s = mUri != null ? Slice.bindSlice(mContext, mUri)
: Slice.bindSlice(mContext, mIntent);
if (mUri == null && s != null) {
mContext.getContentResolver().registerContentObserver(s.getUri(),
false, mObserver);
mUri = s.getUri();
}
postValue(s);
}
};
private final ContentObserver mObserver = new ContentObserver(new Handler()) {
@Override
public void onChange(boolean selfChange) {
AsyncTask.execute(mUpdateSlice);
}
};
}
}
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