Merge "[LeAudio] Move the QrCamera and decorateView from Settings to... (35ba9290) · Commits · e / os / android_frameworks_base

packages/SettingsLib/res/values/colors.xml

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		@@ -39,4 +39,12 @@

		<color name="dark_mode_icon_color_single_tone">#99000000</color>
		<color name="light_mode_icon_color_single_tone">#ffffff</color>

		<color name="user_avatar_color_bg">?android:attr/colorBackgroundFloating</color>

		<!-- QR code scanner colors -->
		<color name="qr_corner_line_color">#ffdadce0</color>
		<color name="qr_focused_corner_line_color">#ff1a73e8</color>
		<color name="qr_background_color">#b3ffffff</color> <!-- 70% white transparency -->
		<!-- End of QR code scanner colors -->
		</resources>

packages/SettingsLib/src/com/android/settingslib/qrcode/QrCamera.java

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		/*
		* Copyright (C) 2022 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 com.android.settingslib.qrcode;

		import android.content.Context;
		import android.content.res.Configuration;
		import android.graphics.Matrix;
		import android.graphics.Rect;
		import android.graphics.SurfaceTexture;
		import android.hardware.Camera;
		import android.os.AsyncTask;
		import android.os.Handler;
		import android.os.Message;
		import android.util.ArrayMap;
		import android.util.Log;
		import android.util.Size;
		import android.view.Surface;
		import android.view.WindowManager;

		import androidx.annotation.VisibleForTesting;

		import com.google.zxing.BarcodeFormat;
		import com.google.zxing.BinaryBitmap;
		import com.google.zxing.DecodeHintType;
		import com.google.zxing.MultiFormatReader;
		import com.google.zxing.ReaderException;
		import com.google.zxing.Result;
		import com.google.zxing.common.HybridBinarizer;

		import java.io.IOException;
		import java.lang.ref.WeakReference;
		import java.util.ArrayList;
		import java.util.List;
		import java.util.Map;
		import java.util.concurrent.Executors;
		import java.util.concurrent.Semaphore;

		public class QrCamera extends Handler {
		private static final String TAG = "QrCamera";

		private static final int MSG_AUTO_FOCUS = 1;

		/**
		* The max allowed difference between picture size ratio and preview size ratio.
		* Uses to filter the picture sizes of similar preview size ratio, for example, if a preview
		* size is 1920x1440, MAX_RATIO_DIFF 0.1 could allow picture size of 720x480 or 352x288 or
		* 176x44 but not 1920x1080.
		*/
		private static final double MAX_RATIO_DIFF = 0.1;

		private static final long AUTOFOCUS_INTERVAL_MS = 1500L;

		private static Map<DecodeHintType, List<BarcodeFormat>> HINTS = new ArrayMap<>();
		private static List<BarcodeFormat> FORMATS = new ArrayList<>();

		static {
		FORMATS.add(BarcodeFormat.QR_CODE);
		HINTS.put(DecodeHintType.POSSIBLE_FORMATS, FORMATS);
		}

		@VisibleForTesting
		Camera mCamera;
		private Size mPreviewSize;
		private WeakReference<Context> mContext;
		private ScannerCallback mScannerCallback;
		private MultiFormatReader mReader;
		private DecodingTask mDecodeTask;
		private int mCameraOrientation;
		@VisibleForTesting
		Camera.Parameters mParameters;

		public QrCamera(Context context, ScannerCallback callback) {
		mContext = new WeakReference<Context>(context);
		mScannerCallback = callback;
		mReader = new MultiFormatReader();
		mReader.setHints(HINTS);
		}

		/**
		* The function start camera preview and capture pictures to decode QR code continuously in a
		* background task.
		*
		* @param surface The surface to be used for live preview.
		*/
		public void start(SurfaceTexture surface) {
		if (mDecodeTask == null) {
		mDecodeTask = new DecodingTask(surface);
		// Execute in the separate thread pool to prevent block other AsyncTask.
		mDecodeTask.executeOnExecutor(Executors.newSingleThreadExecutor());
		}
		}

		/**
		* The function stop camera preview and background decode task. Caller call this function when
		* the surface is being destroyed.
		*/
		public void stop() {
		removeMessages(MSG_AUTO_FOCUS);
		if (mDecodeTask != null) {
		mDecodeTask.cancel(true);
		mDecodeTask = null;
		}
		if (mCamera != null) {
		mCamera.stopPreview();
		releaseCamera();
		}
		}

		/** The scanner which includes this QrCodeCamera class should implement this */
		public interface ScannerCallback {

		/**
		* The function used to handle the decoding result of the QR code.
		*
		* @param result the result QR code after decoding.
		*/
		void handleSuccessfulResult(String result);

		/** Request the QR code scanner to handle the failure happened. */
		void handleCameraFailure();

		/**
		* The function used to get the background View size.
		*
		* @return Includes the background view size.
		*/
		Size getViewSize();

		/**
		* The function used to get the frame position inside the view
		*
		* @param previewSize Is the preview size set by camera
		* @param cameraOrientation Is the orientation of current Camera
		* @return The rectangle would like to crop from the camera preview shot.
		*/
		Rect getFramePosition(Size previewSize, int cameraOrientation);

		/**
		* Sets the transform to associate with preview area.
		*
		* @param transform The transform to apply to the content of preview
		*/
		void setTransform(Matrix transform);

		/**
		* Verify QR code is valid or not. The camera will stop scanning if this callback returns
		* true.
		*
		* @param qrCode The result QR code after decoding.
		* @return Returns true if qrCode hold valid information.
		*/
		boolean isValid(String qrCode);
		}

		@VisibleForTesting
		void setCameraParameter() {
		mParameters = mCamera.getParameters();
		mPreviewSize = getBestPreviewSize(mParameters);
		mParameters.setPreviewSize(mPreviewSize.getWidth(), mPreviewSize.getHeight());
		Size pictureSize = getBestPictureSize(mParameters);
		mParameters.setPictureSize(pictureSize.getWidth(), pictureSize.getHeight());

		final List<String> supportedFlashModes = mParameters.getSupportedFlashModes();
		if (supportedFlashModes != null &&
		supportedFlashModes.contains(Camera.Parameters.FLASH_MODE_OFF)) {
		mParameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
		}

		final List<String> supportedFocusModes = mParameters.getSupportedFocusModes();
		if (supportedFocusModes.contains(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE)) {
		mParameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
		} else if (supportedFocusModes.contains(Camera.Parameters.FOCUS_MODE_AUTO)) {
		mParameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
		}
		mCamera.setParameters(mParameters);
		}

		private boolean startPreview() {
		if (mContext.get() == null) {
		return false;
		}

		final WindowManager winManager =
		(WindowManager) mContext.get().getSystemService(Context.WINDOW_SERVICE);
		final int rotation = winManager.getDefaultDisplay().getRotation();
		int degrees = 0;
		switch (rotation) {
		case Surface.ROTATION_0:
		degrees = 0;
		break;
		case Surface.ROTATION_90:
		degrees = 90;
		break;
		case Surface.ROTATION_180:
		degrees = 180;
		break;
		case Surface.ROTATION_270:
		degrees = 270;
		break;
		}
		final int rotateDegrees = (mCameraOrientation - degrees + 360) % 360;
		mCamera.setDisplayOrientation(rotateDegrees);
		mCamera.startPreview();
		if (Camera.Parameters.FOCUS_MODE_AUTO.equals(mParameters.getFocusMode())) {
		mCamera.autoFocus(/* Camera.AutoFocusCallback */ null);
		sendMessageDelayed(obtainMessage(MSG_AUTO_FOCUS), AUTOFOCUS_INTERVAL_MS);
		}
		return true;
		}

		private class DecodingTask extends AsyncTask<Void, Void, String> {
		private QrYuvLuminanceSource mImage;
		private SurfaceTexture mSurface;

		private DecodingTask(SurfaceTexture surface) {
		mSurface = surface;
		}

		@Override
		protected String doInBackground(Void... tmp) {
		if (!initCamera(mSurface)) {
		return null;
		}

		final Semaphore imageGot = new Semaphore(0);
		while (true) {
		// This loop will try to capture preview image continuously until a valid QR Code
		// decoded. The caller can also call {@link #stop()} to interrupts scanning loop.
		mCamera.setOneShotPreviewCallback(
		(imageData, camera) -> {
		mImage = getFrameImage(imageData);
		imageGot.release();
		});
		try {
		// Semaphore.acquire() blocking until permit is available, or the thread is
		// interrupted.
		imageGot.acquire();
		Result qrCode = null;
		try {
		qrCode =
		mReader.decodeWithState(
		new BinaryBitmap(new HybridBinarizer(mImage)));
		} catch (ReaderException e) {
		// No logging since every time the reader cannot decode the
		// image, this ReaderException will be thrown.
		} finally {
		mReader.reset();
		}
		if (qrCode != null) {
		if (mScannerCallback.isValid(qrCode.getText())) {
		return qrCode.getText();
		}
		}
		} catch (InterruptedException e) {
		Thread.currentThread().interrupt();
		return null;
		}
		}
		}

		@Override
		protected void onPostExecute(String qrCode) {
		if (qrCode != null) {
		mScannerCallback.handleSuccessfulResult(qrCode);
		}
		}

		private boolean initCamera(SurfaceTexture surface) {
		final int numberOfCameras = Camera.getNumberOfCameras();
		Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
		try {
		for (int i = 0; i < numberOfCameras; ++i) {
		Camera.getCameraInfo(i, cameraInfo);
		if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {
		releaseCamera();
		mCamera = Camera.open(i);
		mCameraOrientation = cameraInfo.orientation;
		break;
		}
		}
		if (mCamera == null && numberOfCameras > 0) {
		Log.i(TAG, "Can't find back camera. Opening a different camera");
		Camera.getCameraInfo(0, cameraInfo);
		releaseCamera();
		mCamera = Camera.open(0);
		mCameraOrientation = cameraInfo.orientation;
		}
		} catch (RuntimeException e) {
		Log.e(TAG, "Fail to open camera: " + e);
		mCamera = null;
		mScannerCallback.handleCameraFailure();
		return false;
		}

		try {
		if (mCamera == null) {
		throw new IOException("Cannot find available camera");
		}
		mCamera.setPreviewTexture(surface);
		setCameraParameter();
		setTransformationMatrix();
		if (!startPreview()) {
		throw new IOException("Lost contex");
		}
		} catch (IOException ioe) {
		Log.e(TAG, "Fail to startPreview camera: " + ioe);
		mCamera = null;
		mScannerCallback.handleCameraFailure();
		return false;
		}
		return true;
		}
		}

		private void releaseCamera() {
		if (mCamera != null) {
		mCamera.release();
		mCamera = null;
		}
		}

		/** Set transform matrix to crop and center the preview picture */
		private void setTransformationMatrix() {
		final boolean isPortrait = mContext.get().getResources().getConfiguration().orientation
		== Configuration.ORIENTATION_PORTRAIT;

		final int previewWidth = isPortrait ? mPreviewSize.getWidth() : mPreviewSize.getHeight();
		final int previewHeight = isPortrait ? mPreviewSize.getHeight() : mPreviewSize.getWidth();
		final float ratioPreview = (float) getRatio(previewWidth, previewHeight);

		// Calculate transformation matrix.
		float scaleX = 1.0f;
		float scaleY = 1.0f;
		if (previewWidth > previewHeight) {
		scaleY = scaleX / ratioPreview;
		} else {
		scaleX = scaleY / ratioPreview;
		}

		// Set the transform matrix.
		final Matrix matrix = new Matrix();
		matrix.setScale(scaleX, scaleY);
		mScannerCallback.setTransform(matrix);
		}

		private QrYuvLuminanceSource getFrameImage(byte[] imageData) {
		final Rect frame = mScannerCallback.getFramePosition(mPreviewSize, mCameraOrientation);
		final QrYuvLuminanceSource image = new QrYuvLuminanceSource(imageData,
		mPreviewSize.getWidth(), mPreviewSize.getHeight());
		return (QrYuvLuminanceSource)
		image.crop(frame.left, frame.top, frame.width(), frame.height());
		}

		@Override
		public void handleMessage(Message msg) {
		switch (msg.what) {
		case MSG_AUTO_FOCUS:
		// Calling autoFocus(null) will only trigger the camera to focus once. In order
		// to make the camera continuously auto focus during scanning, need to periodically
		// trigger it.
		mCamera.autoFocus(/* Camera.AutoFocusCallback */ null);
		sendMessageDelayed(obtainMessage(MSG_AUTO_FOCUS), AUTOFOCUS_INTERVAL_MS);
		break;
		default:
		Log.d(TAG, "Unexpected Message: " + msg.what);
		}
		}

		/**
		* Get best preview size from the list of camera supported preview sizes. Compares the
		* preview size and aspect ratio to choose the best one.
		*/
		private Size getBestPreviewSize(Camera.Parameters parameters) {
		final double minRatioDiffPercent = 0.1;
		final Size windowSize = mScannerCallback.getViewSize();
		final double winRatio = getRatio(windowSize.getWidth(), windowSize.getHeight());
		double bestChoiceRatio = 0;
		Size bestChoice = new Size(0, 0);
		for (Camera.Size size : parameters.getSupportedPreviewSizes()) {
		double ratio = getRatio(size.width, size.height);
		if (size.height * size.width > bestChoice.getWidth() * bestChoice.getHeight()
		&& (Math.abs(bestChoiceRatio - winRatio) / winRatio > minRatioDiffPercent
		\|\| Math.abs(ratio - winRatio) / winRatio <= minRatioDiffPercent)) {
		bestChoice = new Size(size.width, size.height);
		bestChoiceRatio = getRatio(size.width, size.height);
		}
		}
		return bestChoice;
		}

		/**
		* Get best picture size from the list of camera supported picture sizes. Compares the
		* picture size and aspect ratio to choose the best one.
		*/
		private Size getBestPictureSize(Camera.Parameters parameters) {
		final Camera.Size previewSize = parameters.getPreviewSize();
		final double previewRatio = getRatio(previewSize.width, previewSize.height);
		List<Size> bestChoices = new ArrayList<>();
		final List<Size> similarChoices = new ArrayList<>();

		// Filter by ratio
		for (Camera.Size size : parameters.getSupportedPictureSizes()) {
		double ratio = getRatio(size.width, size.height);
		if (ratio == previewRatio) {
		bestChoices.add(new Size(size.width, size.height));
		} else if (Math.abs(ratio - previewRatio) < MAX_RATIO_DIFF) {
		similarChoices.add(new Size(size.width, size.height));
		}
		}

		if (bestChoices.size() == 0 && similarChoices.size() == 0) {
		Log.d(TAG, "No proper picture size, return default picture size");
		Camera.Size defaultPictureSize = parameters.getPictureSize();
		return new Size(defaultPictureSize.width, defaultPictureSize.height);
		}

		if (bestChoices.size() == 0) {
		bestChoices = similarChoices;
		}

		// Get the best by area
		int bestAreaDifference = Integer.MAX_VALUE;
		Size bestChoice = null;
		final int previewArea = previewSize.width * previewSize.height;
		for (Size size : bestChoices) {
		int areaDifference = Math.abs(size.getWidth() * size.getHeight() - previewArea);
		if (areaDifference < bestAreaDifference) {
		bestAreaDifference = areaDifference;
		bestChoice = size;
		}
		}
		return bestChoice;
		}

		private double getRatio(double x, double y) {
		return (x < y) ? x / y : y / x;
		}

		@VisibleForTesting
		protected void decodeImage(BinaryBitmap image) {
		Result qrCode = null;

		try {
		qrCode = mReader.decodeWithState(image);
		} catch (ReaderException e) {
		} finally {
		mReader.reset();
		}

		if (qrCode != null) {
		mScannerCallback.handleSuccessfulResult(qrCode.getText());
		}
		}

		/**
		* After {@link #start(SurfaceTexture)}, DecodingTask runs continuously to capture images and
		* decode QR code. DecodingTask become null After {@link #stop()}.
		*
		* Uses this method in test case to prevent power consumption problem.
		*/
		public boolean isDecodeTaskAlive() {
		return mDecodeTask != null;
		}
		}

packages/SettingsLib/src/com/android/settingslib/qrcode/QrDecorateView.java

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Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2022 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 com.android.settingslib.qrcode;

		import android.content.Context;
		import android.graphics.Bitmap;
		import android.graphics.Canvas;
		import android.graphics.Paint;
		import android.graphics.PorterDuff;
		import android.graphics.PorterDuffXfermode;
		import android.graphics.RectF;
		import android.util.AttributeSet;
		import android.util.TypedValue;
		import android.view.View;

		import com.android.settingslib.R;

		public class QrDecorateView extends View {
		private static final float CORNER_STROKE_WIDTH = 4f; // 4dp
		private static final float CORNER_LINE_LENGTH = 264f; // 264dp
		private static final float CORNER_RADIUS = 16f; // 16dp

		final private int mCornerColor;
		final private int mFocusedCornerColor;
		final private int mBackgroundColor;

		final private Paint mStrokePaint;
		final private Paint mTransparentPaint;
		final private Paint mBackgroundPaint;

		final private float mRadius;
		final private float mInnerRidus;

		private Bitmap mMaskBitmap;
		private Canvas mMaskCanvas;

		private RectF mOuterFrame;
		private RectF mInnerFrame;

		private boolean mFocused;

		public QrDecorateView(Context context) {
		this(context, null);
		}

		public QrDecorateView(Context context, AttributeSet attrs) {
		this(context, attrs, 0);
		}

		public QrDecorateView(Context context, AttributeSet attrs, int defStyleAttr) {
		this(context, attrs, defStyleAttr, 0);
		}

		public QrDecorateView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
		super(context, attrs, defStyleAttr, defStyleRes);

		mFocused = false;
		mRadius = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, CORNER_RADIUS,
		getResources().getDisplayMetrics());
		// Inner radius needs to minus stroke width for keeping the width of border consistent.
		mInnerRidus = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
		CORNER_RADIUS - CORNER_STROKE_WIDTH, getResources().getDisplayMetrics());

		mCornerColor = context.getResources().getColor(R.color.qr_corner_line_color);
		mFocusedCornerColor = context.getResources().getColor(R.color.qr_focused_corner_line_color);
		mBackgroundColor = context.getResources().getColor(R.color.qr_background_color);

		mStrokePaint = new Paint();
		mStrokePaint.setAntiAlias(true);

		mTransparentPaint = new Paint();
		mTransparentPaint.setAntiAlias(true);
		mTransparentPaint.setColor(getResources().getColor(android.R.color.transparent));
		mTransparentPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));

		mBackgroundPaint = new Paint();
		mBackgroundPaint.setColor(mBackgroundColor);
		}

		@Override
		protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
		super.onLayout(changed, left, top, right, bottom);

		if(mMaskBitmap == null) {
		mMaskBitmap = Bitmap.createBitmap(getWidth(), getHeight(), Bitmap.Config.ARGB_8888);
		mMaskCanvas = new Canvas(mMaskBitmap);
		}

		calculateFramePos();
		}

		@Override
		protected void onDraw(Canvas canvas) {
		// Set frame line color.
		mStrokePaint.setColor(mFocused ? mFocusedCornerColor : mCornerColor);
		// Draw background color.
		mMaskCanvas.drawColor(mBackgroundColor);
		// Draw outer corner.
		mMaskCanvas.drawRoundRect(mOuterFrame, mRadius, mRadius, mStrokePaint);
		// Draw inner transparent corner.
		mMaskCanvas.drawRoundRect(mInnerFrame, mInnerRidus, mInnerRidus, mTransparentPaint);

		canvas.drawBitmap(mMaskBitmap, 0, 0, mBackgroundPaint);
		super.onDraw(canvas);
		}

		private void calculateFramePos() {
		final int centralX = getWidth() / 2;
		final int centralY = getHeight() / 2;
		final float cornerLineLength = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
		CORNER_LINE_LENGTH, getResources().getDisplayMetrics()) / 2;
		final float strokeWidth = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
		CORNER_STROKE_WIDTH, getResources().getDisplayMetrics());

		mOuterFrame = new RectF(centralX - cornerLineLength, centralY - cornerLineLength,
		centralX + cornerLineLength, centralY + cornerLineLength);
		mInnerFrame = new RectF(mOuterFrame.left + strokeWidth, mOuterFrame.top + strokeWidth,
		mOuterFrame.right - strokeWidth, mOuterFrame.bottom - strokeWidth);
		}

		// Draws green lines if focused. Otherwise, draws white lines.
		public void setFocused(boolean focused) {
		mFocused = focused;
		invalidate();
		}
		}

packages/SettingsLib/src/com/android/settingslib/qrcode/QrYuvLuminanceSource.java

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