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/*
* Copyright 2012-2015 the original author or authors.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package de.pixart.messenger.ui;
import android.Manifest;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.SurfaceTexture;
import android.hardware.Camera;
import android.hardware.Camera.CameraInfo;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Process;
import android.os.Vibrator;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import android.util.Log;
import android.view.KeyEvent;
import android.view.Surface;
import android.view.TextureView;
import android.view.TextureView.SurfaceTextureListener;
import android.view.View;
import android.view.WindowManager;
import android.widget.Toast;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.PlanarYUVLuminanceSource;
import com.google.zxing.ReaderException;
import com.google.zxing.Result;
import com.google.zxing.ResultPointCallback;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.QRCodeReader;
import java.util.EnumMap;
import java.util.Map;
import de.pixart.messenger.Config;
import de.pixart.messenger.R;
import de.pixart.messenger.ui.service.CameraManager;
import de.pixart.messenger.ui.widget.ScannerView;
/**
* @author Andreas Schildbach
*/
@SuppressWarnings("deprecation")
public final class ScanActivity extends Activity implements SurfaceTextureListener, ActivityCompat.OnRequestPermissionsResultCallback {
public static final String INTENT_EXTRA_RESULT = "result";
public static final int REQUEST_SCAN_QR_CODE = 0x0987;
private static final int REQUEST_CAMERA_PERMISSIONS_TO_SCAN = 0x6789;
private static final long VIBRATE_DURATION = 50L;
private static final long AUTO_FOCUS_INTERVAL_MS = 2500L;
private static boolean DISABLE_CONTINUOUS_AUTOFOCUS = Build.MODEL.equals("GT-I9100") // Galaxy S2
|| Build.MODEL.equals("SGH-T989") // Galaxy S2
|| Build.MODEL.equals("SGH-T989D") // Galaxy S2 X
|| Build.MODEL.equals("SAMSUNG-SGH-I727") // Galaxy S2 Skyrocket
|| Build.MODEL.equals("GT-I9300") // Galaxy S3
|| Build.MODEL.equals("GT-N7000"); // Galaxy Note
private final CameraManager cameraManager = new CameraManager();
private ScannerView scannerView;
private TextureView previewView;
private volatile boolean surfaceCreated = false;
private Vibrator vibrator;
private HandlerThread cameraThread;
private volatile Handler cameraHandler;
private final Runnable closeRunnable = new Runnable() {
@Override
public void run() {
cameraHandler.removeCallbacksAndMessages(null);
cameraManager.close();
}
};
private final Runnable fetchAndDecodeRunnable = new Runnable() {
private final QRCodeReader reader = new QRCodeReader();
private final Map<DecodeHintType, Object> hints = new EnumMap<DecodeHintType, Object>(DecodeHintType.class);
@Override
public void run() {
cameraManager.requestPreviewFrame((data, camera) -> decode(data));
}
private void decode(final byte[] data) {
final PlanarYUVLuminanceSource source = cameraManager.buildLuminanceSource(data);
final BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
try {
hints.put(DecodeHintType.NEED_RESULT_POINT_CALLBACK, (ResultPointCallback) dot -> runOnUiThread(() -> scannerView.addDot(dot)));
final Result scanResult = reader.decode(bitmap, hints);
runOnUiThread(() -> handleResult(scanResult));
} catch (final ReaderException x) {
// retry
cameraHandler.post(fetchAndDecodeRunnable);
} finally {
reader.reset();
}
}
};
private final Runnable openRunnable = new Runnable() {
@Override
public void run() {
try {
final Camera camera = cameraManager.open(previewView, displayRotation(), !DISABLE_CONTINUOUS_AUTOFOCUS);
final Rect framingRect = cameraManager.getFrame();
final RectF framingRectInPreview = new RectF(cameraManager.getFramePreview());
framingRectInPreview.offsetTo(0, 0);
final boolean cameraFlip = cameraManager.getFacing() == CameraInfo.CAMERA_FACING_FRONT;
final int cameraRotation = cameraManager.getOrientation();
runOnUiThread(() -> scannerView.setFraming(framingRect, framingRectInPreview, displayRotation(), cameraRotation, cameraFlip));
final String focusMode = camera.getParameters().getFocusMode();
final boolean nonContinuousAutoFocus = Camera.Parameters.FOCUS_MODE_AUTO.equals(focusMode)
|| Camera.Parameters.FOCUS_MODE_MACRO.equals(focusMode);
if (nonContinuousAutoFocus)
cameraHandler.post(new AutoFocusRunnable(camera));
cameraHandler.post(fetchAndDecodeRunnable);
} catch (final Exception x) {
Log.d(Config.LOGTAG, "problem opening camera", x);
}
}
private int displayRotation() {
final int rotation = getWindowManager().getDefaultDisplay().getRotation();
if (rotation == Surface.ROTATION_0)
return 0;
else if (rotation == Surface.ROTATION_90)
return 90;
else if (rotation == Surface.ROTATION_180)
return 180;
else if (rotation == Surface.ROTATION_270)
return 270;
else
throw new IllegalStateException("rotation: " + rotation);
}
};
@Override
public void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
vibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
setContentView(R.layout.activity_scan);
scannerView = findViewById(R.id.scan_activity_mask);
previewView = findViewById(R.id.scan_activity_preview);
previewView.setSurfaceTextureListener(this);
cameraThread = new HandlerThread("cameraThread", Process.THREAD_PRIORITY_BACKGROUND);
cameraThread.start();
cameraHandler = new Handler(cameraThread.getLooper());
}
@Override
protected void onResume() {
super.onResume();
maybeOpenCamera();
}
@Override
protected void onPause() {
cameraHandler.post(closeRunnable);
super.onPause();
}
@Override
protected void onDestroy() {
// cancel background thread
cameraHandler.removeCallbacksAndMessages(null);
cameraThread.quit();
previewView.setSurfaceTextureListener(null);
super.onDestroy();
}
private void maybeOpenCamera() {
if (surfaceCreated && ContextCompat.checkSelfPermission(this,
Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED)
cameraHandler.post(openRunnable);
}
@Override
public void onSurfaceTextureAvailable(final SurfaceTexture surface, final int width, final int height) {
surfaceCreated = true;
maybeOpenCamera();
}
@Override
public boolean onSurfaceTextureDestroyed(final SurfaceTexture surface) {
surfaceCreated = false;
return true;
}
@Override
public void onSurfaceTextureSizeChanged(final SurfaceTexture surface, final int width, final int height) {
}
@Override
public void onSurfaceTextureUpdated(final SurfaceTexture surface) {
}
@Override
public void onAttachedToWindow() {
getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
}
@Override
public void onBackPressed() {
scannerView.setVisibility(View.GONE);
setResult(RESULT_CANCELED);
postFinish();
}
@Override
public boolean onKeyDown(final int keyCode, final KeyEvent event) {
switch (keyCode) {
case KeyEvent.KEYCODE_FOCUS:
case KeyEvent.KEYCODE_CAMERA:
// don't launch camera app
return true;
case KeyEvent.KEYCODE_VOLUME_DOWN:
case KeyEvent.KEYCODE_VOLUME_UP:
cameraHandler.post(() -> cameraManager.setTorch(keyCode == KeyEvent.KEYCODE_VOLUME_UP));
return true;
}
return super.onKeyDown(keyCode, event);
}
public void handleResult(final Result scanResult) {
vibrator.vibrate(VIBRATE_DURATION);
scannerView.setIsResult(true);
final Intent result = new Intent();
result.putExtra(INTENT_EXTRA_RESULT, scanResult.getText());
setResult(RESULT_OK, result);
postFinish();
}
private void postFinish() {
new Handler().postDelayed(this::finish, 50);
}
public static void scan(Activity activity) {
if (ContextCompat.checkSelfPermission(activity, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) {
Intent intent = new Intent(activity, ScanActivity.class);
activity.startActivityForResult(intent, REQUEST_SCAN_QR_CODE);
activity.overridePendingTransition(R.animator.fade_in, R.animator.fade_out);
} else {
ActivityCompat.requestPermissions(activity, new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA_PERMISSIONS_TO_SCAN);
}
}
public static void onRequestPermissionResult(Activity activity, int requestCode, int[] grantResults) {
if (requestCode != REQUEST_CAMERA_PERMISSIONS_TO_SCAN) {
return;
}
if (grantResults.length > 0) {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
scan(activity);
} else {
Toast.makeText(activity, R.string.qr_code_scanner_needs_access_to_camera, Toast.LENGTH_SHORT).show();
}
}
}
private final class AutoFocusRunnable implements Runnable {
private final Camera camera;
private final Camera.AutoFocusCallback autoFocusCallback = new Camera.AutoFocusCallback() {
@Override
public void onAutoFocus(final boolean success, final Camera camera) {
// schedule again
cameraHandler.postDelayed(AutoFocusRunnable.this, AUTO_FOCUS_INTERVAL_MS);
}
};
public AutoFocusRunnable(final Camera camera) {
this.camera = camera;
}
@Override
public void run() {
try {
camera.autoFocus(autoFocusCallback);
} catch (final Exception x) {
Log.d(Config.LOGTAG, "problem with auto-focus, will not schedule again", x);
}
}
}
}
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