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Convert ImagesFragment code from Java to Kotlin
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‎app/src/main/java/ai/elimu/content_provider/ui/image/ImagesFragment.kt

Lines changed: 144 additions & 154 deletions
Original file line numberDiff line numberDiff line change
@@ -1,197 +1,187 @@
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package ai.elimu.content_provider.ui.image;
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import android.os.Bundle;
4-
import android.util.Log;
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import android.view.LayoutInflater;
6-
import android.view.View;
7-
import android.view.ViewGroup;
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import android.widget.ProgressBar;
9-
import android.widget.TextView;
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import androidx.annotation.NonNull;
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import androidx.annotation.Nullable;
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import androidx.fragment.app.Fragment;
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import androidx.lifecycle.Observer;
15-
import androidx.lifecycle.ViewModelProvider;
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import com.google.android.material.snackbar.Snackbar;
18-
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.io.FileOutputStream;
22-
import java.io.IOException;
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import java.util.List;
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import java.util.Set;
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import java.util.concurrent.ExecutorService;
26-
import java.util.concurrent.Executors;
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import ai.elimu.content_provider.BaseApplication;
29-
import ai.elimu.content_provider.R;
30-
import ai.elimu.content_provider.rest.ImagesService;
31-
import ai.elimu.content_provider.room.GsonToRoomConverter;
32-
import ai.elimu.content_provider.room.dao.ImageDao;
33-
import ai.elimu.content_provider.room.dao.Image_WordDao;
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import ai.elimu.content_provider.room.db.RoomDb;
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import ai.elimu.content_provider.room.entity.Image;
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import ai.elimu.content_provider.room.entity.Image_Word;
37-
import ai.elimu.content_provider.util.FileHelper;
38-
import ai.elimu.content_provider.util.MultimediaDownloader;
39-
import ai.elimu.model.v2.gson.content.ImageGson;
40-
import ai.elimu.model.v2.gson.content.WordGson;
41-
import retrofit2.Call;
42-
import retrofit2.Callback;
43-
import retrofit2.Response;
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import retrofit2.Retrofit;
45-
46-
public class ImagesFragment extends Fragment {
47-
48-
private ImagesViewModel imagesViewModel;
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private ProgressBar progressBar;
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52-
private TextView textView;
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54-
public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
55-
Log.i(getClass().getName(), "onCreateView");
56-
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imagesViewModel = new ViewModelProvider(this).get(ImagesViewModel.class);
58-
View root = inflater.inflate(R.layout.fragment_images, container, false);
59-
progressBar = root.findViewById(R.id.progress_bar_images);
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textView = root.findViewById(R.id.text_images);
61-
imagesViewModel.getText().observe(getViewLifecycleOwner(), new Observer<String>() {
62-
@Override
63-
public void onChanged(@Nullable String s) {
64-
Log.i(getClass().getName(), "onChanged");
65-
textView.setText(s);
1+
package ai.elimu.content_provider.ui.image
2+
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import ai.elimu.content_provider.BaseApplication
4+
import ai.elimu.content_provider.R
5+
import ai.elimu.content_provider.rest.ImagesService
6+
import ai.elimu.content_provider.room.GsonToRoomConverter
7+
import ai.elimu.content_provider.room.db.RoomDb
8+
import ai.elimu.content_provider.room.entity.Image_Word
9+
import ai.elimu.content_provider.util.FileHelper
10+
import ai.elimu.content_provider.util.MultimediaDownloader
11+
import ai.elimu.model.v2.gson.content.ImageGson
12+
import android.os.Bundle
13+
import android.util.Log
14+
import android.view.LayoutInflater
15+
import android.view.View
16+
import android.view.ViewGroup
17+
import android.widget.ProgressBar
18+
import android.widget.TextView
19+
import androidx.fragment.app.Fragment
20+
import androidx.lifecycle.Observer
21+
import androidx.lifecycle.ViewModelProvider
22+
import com.google.android.material.snackbar.Snackbar
23+
import retrofit2.Call
24+
import retrofit2.Callback
25+
import retrofit2.Response
26+
import java.io.FileNotFoundException
27+
import java.io.FileOutputStream
28+
import java.io.IOException
29+
import java.util.concurrent.Executors
30+
31+
class ImagesFragment : Fragment() {
32+
private var imagesViewModel: ImagesViewModel? = null
33+
34+
private var progressBar: ProgressBar? = null
35+
36+
private var textView: TextView? = null
37+
38+
override fun onCreateView(
39+
inflater: LayoutInflater,
40+
container: ViewGroup?,
41+
savedInstanceState: Bundle?
42+
): View? {
43+
Log.i(javaClass.name, "onCreateView")
44+
45+
imagesViewModel = ViewModelProvider(this).get(ImagesViewModel::class.java)
46+
val root = inflater.inflate(R.layout.fragment_images, container, false)
47+
progressBar = root.findViewById(R.id.progress_bar_images)
48+
textView = root.findViewById(R.id.text_images) as? TextView
49+
imagesViewModel!!.text.observe(viewLifecycleOwner, object : Observer<String?> {
50+
override fun onChanged(s: String?) {
51+
Log.i(javaClass.name, "onChanged")
52+
textView?.text = s
6653
}
67-
});
68-
return root;
54+
})
55+
return root
6956
}
7057

71-
@Override
72-
public void onStart() {
73-
Log.i(getClass().getName(), "onStart");
74-
super.onStart();
58+
override fun onStart() {
59+
Log.i(javaClass.name, "onStart")
60+
super.onStart()
7561

7662
// Download Images from REST API, and store them in the database
77-
BaseApplication baseApplication = (BaseApplication) getActivity().getApplication();
78-
Retrofit retrofit = baseApplication.getRetrofit();
79-
ImagesService imagesService = retrofit.create(ImagesService.class);
80-
Call<List<ImageGson>> imageGsonsCall = imagesService.listImages();
81-
Log.i(getClass().getName(), "imageGsonsCall.request(): " + imageGsonsCall.request());
82-
imageGsonsCall.enqueue(new Callback<List<ImageGson>>() {
83-
84-
@Override
85-
public void onResponse(Call<List<ImageGson>> call, Response<List<ImageGson>> response) {
86-
Log.i(getClass().getName(), "onResponse");
87-
88-
Log.i(getClass().getName(), "response: " + response);
89-
if (response.isSuccessful()) {
90-
List<ImageGson> imageGsons = response.body();
91-
Log.i(getClass().getName(), "imageGsons.size(): " + imageGsons.size());
92-
93-
if (imageGsons.size() > 0) {
94-
processResponseBody(imageGsons);
63+
val baseApplication = activity!!.application as BaseApplication
64+
val retrofit = baseApplication.retrofit
65+
val imagesService = retrofit.create(ImagesService::class.java)
66+
val imageGsonsCall = imagesService.listImages()
67+
Log.i(javaClass.name, "imageGsonsCall.request(): " + imageGsonsCall.request())
68+
imageGsonsCall.enqueue(object : Callback<List<ImageGson>> {
69+
override fun onResponse(
70+
call: Call<List<ImageGson>>,
71+
response: Response<List<ImageGson>>
72+
) {
73+
Log.i(javaClass.name, "onResponse")
74+
75+
Log.i(javaClass.name, "response: $response")
76+
if (response.isSuccessful) {
77+
val imageGsons = response.body()!!
78+
Log.i(javaClass.name, "imageGsons.size(): " + imageGsons.size)
79+
80+
if (imageGsons.size > 0) {
81+
processResponseBody(imageGsons)
9582
}
9683
} else {
9784
// Handle error
98-
Snackbar.make(textView, response.toString(), Snackbar.LENGTH_LONG)
99-
.setBackgroundTint(getResources().getColor(R.color.deep_orange_darken_4))
100-
.show();
101-
progressBar.setVisibility(View.GONE);
85+
Snackbar.make(textView!!, response.toString(), Snackbar.LENGTH_LONG)
86+
.setBackgroundTint(resources.getColor(R.color.deep_orange_darken_4))
87+
.show()
88+
progressBar!!.visibility = View.GONE
10289
}
10390
}
10491

105-
@Override
106-
public void onFailure(Call<List<ImageGson>> call, Throwable t) {
107-
Log.e(getClass().getName(), "onFailure", t);
92+
override fun onFailure(call: Call<List<ImageGson>>, t: Throwable) {
93+
Log.e(javaClass.name, "onFailure", t)
10894

109-
Log.e(getClass().getName(), "t.getCause():", t.getCause());
95+
Log.e(javaClass.name, "t.getCause():", t.cause)
11096

11197
// Handle error
112-
Snackbar.make(textView, t.getCause().toString(), Snackbar.LENGTH_LONG)
113-
.setBackgroundTint(getResources().getColor(R.color.deep_orange_darken_4))
114-
.show();
115-
progressBar.setVisibility(View.GONE);
98+
Snackbar.make(textView!!, t.cause.toString(), Snackbar.LENGTH_LONG)
99+
.setBackgroundTint(resources.getColor(R.color.deep_orange_darken_4))
100+
.show()
101+
progressBar!!.visibility = View.GONE
116102
}
117-
});
103+
})
118104
}
119105

120-
private void processResponseBody(List<ImageGson> imageGsons) {
121-
Log.i(getClass().getName(), "processResponseBody");
106+
private fun processResponseBody(imageGsons: List<ImageGson>) {
107+
Log.i(javaClass.name, "processResponseBody")
122108

123-
ExecutorService executorService = Executors.newSingleThreadExecutor();
124-
executorService.execute(new Runnable() {
125-
@Override
126-
public void run() {
127-
Log.i(getClass().getName(), "run");
109+
val executorService = Executors.newSingleThreadExecutor()
110+
executorService.execute(object : Runnable {
111+
override fun run() {
112+
Log.i(javaClass.name, "run")
128113

129-
RoomDb roomDb = RoomDb.getDatabase(getContext());
130-
ImageDao imageDao = roomDb.imageDao();
131-
Image_WordDao image_WordDao = roomDb.image_WordDao();
114+
val roomDb = RoomDb.getDatabase(context)
115+
val imageDao = roomDb.imageDao()
116+
val image_WordDao = roomDb.image_WordDao()
132117

133118
// Empty the database table before downloading up-to-date content
134-
image_WordDao.deleteAll();
135-
imageDao.deleteAll();
136-
// TODO: also delete corresponding image files (only those that are no longer used)
119+
image_WordDao.deleteAll()
120+
imageDao.deleteAll()
137121

138-
for (ImageGson imageGson : imageGsons) {
139-
Log.i(getClass().getName(), "imageGson.getId(): " + imageGson.getId());
122+
// TODO: also delete corresponding image files (only those that are no longer used)
123+
for (imageGson in imageGsons) {
124+
Log.i(javaClass.name, "imageGson.getId(): " + imageGson.id)
140125

141-
Image image = GsonToRoomConverter.getImage(imageGson);
126+
val image = GsonToRoomConverter.getImage(imageGson)
142127

143128
// Check if the corresponding image file has already been downloaded
144-
File imageFile = FileHelper.getImageFile(imageGson, getContext());
145-
Log.i(getClass().getName(), "imageFile: " + imageFile);
146-
Log.i(getClass().getName(), "imageFile.exists(): " + imageFile.exists());
129+
val imageFile = FileHelper.getImageFile(imageGson, context)
130+
Log.i(javaClass.name, "imageFile: $imageFile")
131+
Log.i(javaClass.name, "imageFile.exists(): " + imageFile.exists())
147132
if (!imageFile.exists()) {
148133
// Download file bytes
149-
BaseApplication baseApplication = (BaseApplication) getActivity().getApplication();
150-
String downloadUrl = imageGson.getBytesUrl().startsWith("http")
151-
? imageGson.getBytesUrl()
152-
: baseApplication.getBaseUrl() + imageGson.getBytesUrl();
153-
Log.i(getClass().getName(), "downloadUrl: " + downloadUrl);
154-
byte[] bytes = MultimediaDownloader.downloadFileBytes(downloadUrl);
155-
Log.i(getClass().getName(), "bytes.length: " + bytes.length);
134+
val baseApplication = activity!!.application as BaseApplication
135+
val downloadUrl = if (imageGson.bytesUrl.startsWith("http"))
136+
imageGson.bytesUrl
137+
else
138+
baseApplication.baseUrl + imageGson.bytesUrl
139+
Log.i(javaClass.name, "downloadUrl: $downloadUrl")
140+
val bytes = MultimediaDownloader.downloadFileBytes(downloadUrl)
141+
Log.i(javaClass.name, "bytes.length: " + bytes.size)
156142

157143
// Store the downloaded file in the external storage directory
158144
try {
159-
FileOutputStream fileOutputStream = new FileOutputStream(imageFile);
160-
fileOutputStream.write(bytes);
161-
} catch (FileNotFoundException e) {
162-
Log.e(getClass().getName(), null, e);
163-
} catch (IOException e) {
164-
Log.e(getClass().getName(), null, e);
145+
val fileOutputStream = FileOutputStream(imageFile)
146+
fileOutputStream.write(bytes)
147+
} catch (e: FileNotFoundException) {
148+
Log.e(javaClass.name, null, e)
149+
} catch (e: IOException) {
150+
Log.e(javaClass.name, null, e)
165151
}
166-
Log.i(getClass().getName(), "imageFile.exists(): " + imageFile.exists());
152+
Log.i(javaClass.name, "imageFile.exists(): " + imageFile.exists())
167153
}
168154

169155
// Store the Image in the database
170-
imageDao.insert(image);
171-
Log.i(getClass().getName(), "Stored Image in database with ID " + image.getId());
156+
imageDao.insert(image)
157+
Log.i(javaClass.name, "Stored Image in database with ID " + image.id)
172158

173159
// Store all the Image's Word labels in the database
174-
Set<WordGson> wordGsons = imageGson.getWords();
175-
Log.i(getClass().getName(), "wordGsons.size(): " + wordGsons.size());
176-
for (WordGson wordGson : wordGsons) {
177-
Log.i(getClass().getName(), "wordGson.getId(): " + wordGson.getId());
178-
Image_Word image_Word = new Image_Word();
179-
image_Word.setImage_id(imageGson.getId());
180-
image_Word.setWords_id(wordGson.getId());
181-
image_WordDao.insert(image_Word);
182-
Log.i(getClass().getName(), "Stored Image_Word in database. Image_id: " + image_Word.getImage_id() + ", words_id: " + image_Word.getWords_id());
160+
val wordGsons = imageGson.words
161+
Log.i(javaClass.name, "wordGsons.size(): " + wordGsons.size)
162+
for (wordGson in wordGsons) {
163+
Log.i(javaClass.name, "wordGson.getId(): " + wordGson.id)
164+
val image_Word = Image_Word()
165+
image_Word.image_id = imageGson.id
166+
image_Word.words_id = wordGson.id
167+
image_WordDao.insert(image_Word)
168+
Log.i(
169+
javaClass.name,
170+
"Stored Image_Word in database. Image_id: " + image_Word.image_id + ", words_id: " + image_Word.words_id
171+
)
183172
}
184173
}
185174

186175
// Update the UI
187-
List<Image> images = imageDao.loadAll();
188-
Log.i(getClass().getName(), "images.size(): " + images.size());
189-
getActivity().runOnUiThread(() -> {
190-
textView.setText("images.size(): " + images.size());
191-
Snackbar.make(textView, "images.size(): " + images.size(), Snackbar.LENGTH_LONG).show();
192-
progressBar.setVisibility(View.GONE);
193-
});
176+
val images = imageDao.loadAll()
177+
Log.i(javaClass.name, "images.size(): " + images.size)
178+
activity!!.runOnUiThread {
179+
textView!!.text = "images.size(): " + images.size
180+
Snackbar.make(textView!!, "images.size(): " + images.size, Snackbar.LENGTH_LONG)
181+
.show()
182+
progressBar!!.visibility = View.GONE
183+
}
194184
}
195-
});
185+
})
196186
}
197187
}

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