1/*
2 * Copyright 2012-2015 the original author or authors.
3 *
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18package eu.siacs.conversations.ui;
19
20import android.Manifest;
21import android.app.Activity;
22import android.content.Context;
23import android.content.Intent;
24import android.content.pm.PackageManager;
25import android.graphics.Rect;
26import android.graphics.RectF;
27import android.graphics.SurfaceTexture;
28import android.hardware.Camera;
29import android.hardware.Camera.CameraInfo;
30import android.os.Build;
31import android.os.Bundle;
32import android.os.Handler;
33import android.os.HandlerThread;
34import android.os.Process;
35import android.os.Vibrator;
36import android.util.Log;
37import android.view.KeyEvent;
38import android.view.Surface;
39import android.view.TextureView;
40import android.view.TextureView.SurfaceTextureListener;
41import android.view.View;
42import android.view.WindowManager;
43import android.widget.Toast;
44
45import androidx.core.app.ActivityCompat;
46import androidx.core.content.ContextCompat;
47
48import com.google.zxing.BinaryBitmap;
49import com.google.zxing.DecodeHintType;
50import com.google.zxing.PlanarYUVLuminanceSource;
51import com.google.zxing.ReaderException;
52import com.google.zxing.Result;
53import com.google.zxing.ResultPointCallback;
54import com.google.zxing.common.HybridBinarizer;
55import com.google.zxing.qrcode.QRCodeReader;
56
57import java.util.EnumMap;
58import java.util.Map;
59
60import eu.siacs.conversations.Config;
61import eu.siacs.conversations.R;
62import eu.siacs.conversations.ui.service.CameraManager;
63import eu.siacs.conversations.ui.widget.ScannerView;
64
65/**
66 * @author Andreas Schildbach
67 */
68@SuppressWarnings("deprecation")
69public final class ScanActivity extends Activity implements SurfaceTextureListener, ActivityCompat.OnRequestPermissionsResultCallback {
70 public static final String INTENT_EXTRA_RESULT = "result";
71
72 public static final int REQUEST_SCAN_QR_CODE = 0x0987;
73 private static final int REQUEST_CAMERA_PERMISSIONS_TO_SCAN = 0x6789;
74
75 private static final long VIBRATE_DURATION = 50L;
76 private static final long AUTO_FOCUS_INTERVAL_MS = 2500L;
77 private static final boolean DISABLE_CONTINUOUS_AUTOFOCUS = Build.MODEL.equals("GT-I9100") // Galaxy S2
78 || Build.MODEL.equals("SGH-T989") // Galaxy S2
79 || Build.MODEL.equals("SGH-T989D") // Galaxy S2 X
80 || Build.MODEL.equals("SAMSUNG-SGH-I727") // Galaxy S2 Skyrocket
81 || Build.MODEL.equals("GT-I9300") // Galaxy S3
82 || Build.MODEL.equals("GT-N7000"); // Galaxy Note
83 private final CameraManager cameraManager = new CameraManager();
84 private ScannerView scannerView;
85 private TextureView previewView;
86 private volatile boolean surfaceCreated = false;
87 private Vibrator vibrator;
88 private HandlerThread cameraThread;
89 private volatile Handler cameraHandler;
90 private final Runnable closeRunnable = new Runnable() {
91 @Override
92 public void run() {
93 cameraHandler.removeCallbacksAndMessages(null);
94 cameraManager.close();
95 }
96 };
97 private final Runnable fetchAndDecodeRunnable = new Runnable() {
98 private final QRCodeReader reader = new QRCodeReader();
99 private final Map<DecodeHintType, Object> hints = new EnumMap<DecodeHintType, Object>(DecodeHintType.class);
100
101 @Override
102 public void run() {
103 cameraManager.requestPreviewFrame((data, camera) -> decode(data));
104 }
105
106 private void decode(final byte[] data) {
107 final PlanarYUVLuminanceSource source = cameraManager.buildLuminanceSource(data);
108 final BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
109
110 try {
111 hints.put(DecodeHintType.NEED_RESULT_POINT_CALLBACK, (ResultPointCallback) dot -> runOnUiThread(() -> scannerView.addDot(dot)));
112 final Result scanResult = reader.decode(bitmap, hints);
113
114 runOnUiThread(() -> handleResult(scanResult));
115 } catch (final ReaderException x) {
116 // retry
117 cameraHandler.post(fetchAndDecodeRunnable);
118 } finally {
119 reader.reset();
120 }
121 }
122 };
123 private final Runnable openRunnable = new Runnable() {
124 @Override
125 public void run() {
126 try {
127 final Camera camera = cameraManager.open(previewView, displayRotation(), !DISABLE_CONTINUOUS_AUTOFOCUS);
128
129 final Rect framingRect = cameraManager.getFrame();
130 final RectF framingRectInPreview = new RectF(cameraManager.getFramePreview());
131 framingRectInPreview.offsetTo(0, 0);
132 final boolean cameraFlip = cameraManager.getFacing() == CameraInfo.CAMERA_FACING_FRONT;
133 final int cameraRotation = cameraManager.getOrientation();
134
135 runOnUiThread(() -> scannerView.setFraming(framingRect, framingRectInPreview, displayRotation(), cameraRotation, cameraFlip));
136
137 final String focusMode = camera.getParameters().getFocusMode();
138 final boolean nonContinuousAutoFocus = Camera.Parameters.FOCUS_MODE_AUTO.equals(focusMode)
139 || Camera.Parameters.FOCUS_MODE_MACRO.equals(focusMode);
140
141 if (nonContinuousAutoFocus)
142 cameraHandler.post(new AutoFocusRunnable(camera));
143
144 cameraHandler.post(fetchAndDecodeRunnable);
145 } catch (final Exception x) {
146 Log.d(Config.LOGTAG, "problem opening camera", x);
147 }
148 }
149
150 private int displayRotation() {
151 final int rotation = getWindowManager().getDefaultDisplay().getRotation();
152 if (rotation == Surface.ROTATION_0)
153 return 0;
154 else if (rotation == Surface.ROTATION_90)
155 return 90;
156 else if (rotation == Surface.ROTATION_180)
157 return 180;
158 else if (rotation == Surface.ROTATION_270)
159 return 270;
160 else
161 throw new IllegalStateException("rotation: " + rotation);
162 }
163 };
164
165 @Override
166 public void onCreate(final Bundle savedInstanceState) {
167 super.onCreate(savedInstanceState);
168
169 vibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
170
171 setContentView(R.layout.activity_scan);
172 scannerView = findViewById(R.id.scan_activity_mask);
173 previewView = findViewById(R.id.scan_activity_preview);
174 previewView.setSurfaceTextureListener(this);
175
176 cameraThread = new HandlerThread("cameraThread", Process.THREAD_PRIORITY_BACKGROUND);
177 cameraThread.start();
178 cameraHandler = new Handler(cameraThread.getLooper());
179 }
180
181 @Override
182 protected void onResume() {
183 super.onResume();
184 maybeOpenCamera();
185 }
186
187 @Override
188 protected void onPause() {
189 cameraHandler.post(closeRunnable);
190
191 super.onPause();
192 }
193
194 @Override
195 protected void onDestroy() {
196 // cancel background thread
197 cameraHandler.removeCallbacksAndMessages(null);
198 cameraThread.quit();
199
200 previewView.setSurfaceTextureListener(null);
201
202 super.onDestroy();
203 }
204
205 private void maybeOpenCamera() {
206 if (surfaceCreated && ContextCompat.checkSelfPermission(this,
207 Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED)
208 cameraHandler.post(openRunnable);
209 }
210
211 @Override
212 public void onSurfaceTextureAvailable(final SurfaceTexture surface, final int width, final int height) {
213 surfaceCreated = true;
214 maybeOpenCamera();
215 }
216
217 @Override
218 public boolean onSurfaceTextureDestroyed(final SurfaceTexture surface) {
219 surfaceCreated = false;
220 return true;
221 }
222
223 @Override
224 public void onSurfaceTextureSizeChanged(final SurfaceTexture surface, final int width, final int height) {
225 }
226
227 @Override
228 public void onSurfaceTextureUpdated(final SurfaceTexture surface) {
229 }
230
231 @Override
232 public void onAttachedToWindow() {
233 getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
234 }
235
236 @Override
237 public void onBackPressed() {
238 scannerView.setVisibility(View.GONE);
239 setResult(RESULT_CANCELED);
240 postFinish();
241 }
242
243 @Override
244 public boolean onKeyDown(final int keyCode, final KeyEvent event) {
245 switch (keyCode) {
246 case KeyEvent.KEYCODE_FOCUS:
247 case KeyEvent.KEYCODE_CAMERA:
248 // don't launch camera app
249 return true;
250 case KeyEvent.KEYCODE_VOLUME_DOWN:
251 case KeyEvent.KEYCODE_VOLUME_UP:
252 cameraHandler.post(() -> cameraManager.setTorch(keyCode == KeyEvent.KEYCODE_VOLUME_UP));
253 return true;
254 }
255
256 return super.onKeyDown(keyCode, event);
257 }
258
259 public void handleResult(final Result scanResult) {
260 vibrator.vibrate(VIBRATE_DURATION);
261
262 scannerView.setIsResult(true);
263
264 final Intent result = new Intent();
265 result.putExtra(INTENT_EXTRA_RESULT, scanResult.getText());
266 setResult(RESULT_OK, result);
267 postFinish();
268 }
269
270 private void postFinish() {
271 new Handler().postDelayed(this::finish, 50);
272 }
273
274 public static void scan(Activity activity) {
275 if (ContextCompat.checkSelfPermission(activity, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) {
276 Intent intent = new Intent(activity, ScanActivity.class);
277 activity.startActivityForResult(intent, REQUEST_SCAN_QR_CODE);
278 } else {
279 ActivityCompat.requestPermissions(activity, new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA_PERMISSIONS_TO_SCAN);
280 }
281
282 }
283
284 public static void onRequestPermissionResult(Activity activity, int requestCode, int[] grantResults) {
285 if (requestCode != REQUEST_CAMERA_PERMISSIONS_TO_SCAN) {
286 return;
287 }
288 if (grantResults.length > 0) {
289 if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
290 scan(activity);
291 } else {
292 Toast.makeText(activity, R.string.qr_code_scanner_needs_access_to_camera, Toast.LENGTH_SHORT).show();
293 }
294 }
295 }
296
297 private final class AutoFocusRunnable implements Runnable {
298 private final Camera camera;
299 private final Camera.AutoFocusCallback autoFocusCallback = new Camera.AutoFocusCallback() {
300 @Override
301 public void onAutoFocus(final boolean success, final Camera camera) {
302 // schedule again
303 cameraHandler.postDelayed(AutoFocusRunnable.this, AUTO_FOCUS_INTERVAL_MS);
304 }
305 };
306
307 public AutoFocusRunnable(final Camera camera) {
308 this.camera = camera;
309 }
310
311 @Override
312 public void run() {
313 try {
314 camera.autoFocus(autoFocusCallback);
315 } catch (final Exception x) {
316 Log.d(Config.LOGTAG, "problem with auto-focus, will not schedule again", x);
317 }
318 }
319 }
320}