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/*
* Copyright (C) 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.work.integration.testapp.imageprocessing;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.support.annotation.NonNull;
import android.text.TextUtils;
import android.util.Log;
import androidx.work.Data;
import androidx.work.OneTimeWorkRequest;
import androidx.work.Worker;
import androidx.work.integration.testapp.db.Image;
import androidx.work.integration.testapp.db.TestDatabase;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* Creates a compressed transformed image from a given {@link Uri} and writes
* the information as a {@link Image} entity
*/
public class ImageProcessingWorker extends Worker {
private static final String URI_KEY = "uri";
private static final String TAG = "ImageProcessingWorker";
@Override
public @NonNull Result doWork() {
Log.d(TAG, "Started");
String uriString = getInputData().getString(URI_KEY);
if (TextUtils.isEmpty(uriString)) {
Log.e(TAG, "Invalid URI!");
return Result.FAILURE;
}
Bitmap image = retrieveImage(uriString);
if (image == null) {
Log.e(TAG, "Could not retrieve image!");
return Result.FAILURE;
}
invertColors(image);
String filePath = compressImage(image);
if (TextUtils.isEmpty(filePath)) {
Log.e(TAG, "Could not compress image!");
return Result.FAILURE;
}
int processed = TestDatabase.getInstance(getApplicationContext())
.getImageDao()
.setProcessed(uriString, filePath);
if (processed != 1) {
Log.e(TAG, "Database was not updated!");
return Result.FAILURE;
}
Log.d(TAG, "Image Processing Complete!");
return Result.SUCCESS;
}
private Bitmap retrieveImage(String uriString) {
Uri uri = Uri.parse(uriString);
InputStream inputStream = null;
try {
inputStream = getApplicationContext().getContentResolver().openInputStream(uri);
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 4; // Sample down to save memory
options.inMutable = true; // Allow editing of bitmap
return BitmapFactory.decodeStream(inputStream, null, options);
} catch (FileNotFoundException e) {
e.printStackTrace();
return null;
} finally {
if (inputStream != null) {
try {
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
private void invertColors(Bitmap bitmap) {
int w = bitmap.getWidth();
int h = bitmap.getHeight();
for (int x = 0; x < w; ++x) {
for (int y = 0; y < h; ++y) {
int color = bitmap.getPixel(x, y);
int reversedColor = (color & 0xff000000) | (0x00ffffff - (color & 0x00ffffff));
bitmap.setPixel(x, y, reversedColor);
}
}
}
private String compressImage(Bitmap bitmap) {
FileOutputStream os = null;
try {
File tempFile = File.createTempFile("compressed_", ".jpg",
getApplicationContext().getCacheDir());
os = new FileOutputStream(tempFile);
if (!bitmap.compress(Bitmap.CompressFormat.JPEG, 25, os)) {
return null;
}
return tempFile.getAbsolutePath();
} catch (IOException e) {
e.printStackTrace();
return null;
} finally {
if (os != null) {
try {
os.flush();
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
static OneTimeWorkRequest createWork(String uriString) {
Data input = new Data.Builder().putString(URI_KEY, uriString).build();
return new OneTimeWorkRequest.Builder(ImageProcessingWorker.class)
.setInputData(input).build();
}
}
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