Add QrCamera for QrCode scanner implementation
The QrCode Scanner is for Wifi DPP feature. Bug: 118797380 Test: RunSettingsRoboTests Change-Id: I962d069a8c2bce78c00ac8ce9e8ebf176e75873c
This commit is contained in:
Johnson Lu
328
src/com/android/settings/wifi/qrcode/QrCamera.java
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328
src/com/android/settings/wifi/qrcode/QrCamera.java
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/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License
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*/
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package com.android.settings.wifi.qrcode;
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import android.content.Context;
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import android.graphics.Rect;
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import android.hardware.Camera;
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import android.hardware.Camera.CameraInfo;
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import android.hardware.Camera.Parameters;
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import android.hardware.Camera.PreviewCallback;
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import android.os.AsyncTask;
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import android.os.Handler;
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import android.os.Message;
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import android.util.ArrayMap;
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import android.util.Log;
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import android.util.Size;
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import android.view.Surface;
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import android.view.SurfaceHolder;
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import android.view.WindowManager;
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import com.google.zxing.BarcodeFormat;
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import com.google.zxing.BinaryBitmap;
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import com.google.zxing.DecodeHintType;
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import com.google.zxing.MultiFormatReader;
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import com.google.zxing.ReaderException;
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import com.google.zxing.Result;
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import com.google.zxing.common.HybridBinarizer;
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import java.io.IOException;
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import java.lang.ref.WeakReference;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Map;
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import java.util.concurrent.Semaphore;
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import androidx.annotation.VisibleForTesting;
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/**
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* Manage the camera for the QR scanner and help the decoder to get the image inside the scanning
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* frame. Caller prepares a {@link SurfaceHolder} then call {@link #start(SurfaceHolder)} to
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* start QR Code scanning. The scanning result will return by ScannerCallback interface. Caller
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* can also call {@link #stop()} to halt QR Code scanning before the result returned.
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*/
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public class QrCamera extends Handler {
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private static final String TAG = "QrCamera";
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private static final int MSG_AUTO_FOCUS = 1;
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private static double MIN_RATIO_DIFF_PERCENT = 0.1;
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private static long AUTOFOCUS_INTERVAL_MS = 1500L;
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private static Map<DecodeHintType, List<BarcodeFormat>> HINTS = new ArrayMap<>();
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private static List<BarcodeFormat> FORMATS = new ArrayList<>();
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static {
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FORMATS.add(BarcodeFormat.QR_CODE);
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HINTS.put(DecodeHintType.POSSIBLE_FORMATS, FORMATS);
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}
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private Camera mCamera;
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private Size mPreviewSize;
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private WeakReference<Context> mContext;
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private ScannerCallback mScannerCallback;
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private MultiFormatReader mReader;
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private DecodingTask mDecodeTask;
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private int mCameraOrientation;
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private Camera.Parameters mParameters;
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public QrCamera(Context context, ScannerCallback callback) {
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mContext = new WeakReference<Context>(context);
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mScannerCallback = callback;
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mReader = new MultiFormatReader();
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mReader.setHints(HINTS);
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}
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void start(SurfaceHolder surfaceHolder) {
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if (mDecodeTask == null) {
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mDecodeTask = new DecodingTask(surfaceHolder);
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mDecodeTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
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}
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}
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void stop() {
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removeMessages(MSG_AUTO_FOCUS);
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if (mDecodeTask != null) {
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mDecodeTask.cancel(true);
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mDecodeTask = null;
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}
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if (mCamera != null) {
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mCamera.stopPreview();
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}
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}
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/** The scanner which includes this QrCamera class should implement this */
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interface ScannerCallback {
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/**
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* The function used to handle the decoding result of the QR code.
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*
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* @param result the result QR code after decoding.
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*/
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void handleSuccessfulResult(String result);
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/** Request the QR code scanner to handle the failure happened. */
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void handleCameraFailure();
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/**
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* The function used to get the background View size.
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*
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* @return Includes the background view size.
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*/
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Size getViewSize();
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/**
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* The function used to get the frame position inside the view
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*
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* @param previewSize Is the preview size set by camera
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* @param cameraOrientation Is the orientation of current Camera
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* @return The rectangle would like to crop from the camera preview shot.
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*/
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Rect getFramePosition(Size previewSize, int cameraOrientation);
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}
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private void setCameraParameter() {
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mParameters = mCamera.getParameters();
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mPreviewSize = getBestPreviewSize(mParameters);
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mParameters.setPreviewSize(mPreviewSize.getWidth(), mPreviewSize.getHeight());
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mParameters.setPictureSize(mPreviewSize.getWidth(), mPreviewSize.getHeight());
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if (mParameters.getSupportedFlashModes().contains(Parameters.FLASH_MODE_OFF)) {
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mParameters.setFlashMode(Parameters.FLASH_MODE_OFF);
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}
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final List<String> supportedFocusModes = mParameters.getSupportedFocusModes();
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if (supportedFocusModes.contains(Parameters.FOCUS_MODE_CONTINUOUS_PICTURE)) {
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mParameters.setFocusMode(Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
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} else if (supportedFocusModes.contains(Parameters.FOCUS_MODE_AUTO)) {
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mParameters.setFocusMode(Parameters.FOCUS_MODE_AUTO);
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}
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mCamera.setParameters(mParameters);
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}
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private boolean startPreview() {
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if (mContext.get() == null) {
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return false;
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}
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final WindowManager winManager =
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(WindowManager) mContext.get().getSystemService(Context.WINDOW_SERVICE);
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final int rotation = winManager.getDefaultDisplay().getRotation();
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int degrees = 0;
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switch (rotation) {
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case Surface.ROTATION_0:
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degrees = 0;
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break;
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case Surface.ROTATION_90:
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degrees = 90;
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break;
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case Surface.ROTATION_180:
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degrees = 180;
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break;
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case Surface.ROTATION_270:
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degrees = 270;
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break;
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}
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final int rotateDegrees = (mCameraOrientation - degrees + 360) % 360;
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mCamera.setDisplayOrientation(rotateDegrees);
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mCamera.startPreview();
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if (mParameters.getFocusMode() == Parameters.FOCUS_MODE_AUTO) {
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mCamera.autoFocus(/* Camera.AutoFocusCallback */ null);
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sendMessageDelayed(obtainMessage(MSG_AUTO_FOCUS), AUTOFOCUS_INTERVAL_MS);
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}
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return true;
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}
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private class DecodingTask extends AsyncTask<Void, Void, String> {
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private QrYuvLuminanceSource mImage;
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private SurfaceHolder mSurfaceHolder;
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private DecodingTask(SurfaceHolder surfaceHolder) {
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mSurfaceHolder = surfaceHolder;
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}
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@Override
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protected String doInBackground(Void... tmp) {
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if (!initCamera(mSurfaceHolder)) {
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return null;
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}
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final Semaphore imageGot = new Semaphore(0);
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while (true) {
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// This loop will try to capture preview image continuously until a valid QR Code
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// decoded. The caller can also call {@link #stop()} to inturrupts scanning loop.
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mCamera.setOneShotPreviewCallback(
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(imageData, camera) -> {
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mImage = getFrameImage(imageData);
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imageGot.release();
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});
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try {
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// Semaphore.acquire() blocking until permit is available, or the thread is
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// interrupted.
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imageGot.acquire();
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Result qrCode = null;
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try {
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qrCode =
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mReader.decodeWithState(
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new BinaryBitmap(new HybridBinarizer(mImage)));
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} catch (ReaderException e) {
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// No logging since every time the reader cannot decode the
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// image, this ReaderException will be thrown.
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} finally {
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mReader.reset();
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}
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if (qrCode != null) {
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return qrCode.getText();
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}
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} catch (InterruptedException e) {
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Thread.currentThread().interrupt();
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return null;
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}
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}
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}
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@Override
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protected void onPostExecute(String qrCode) {
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if (qrCode != null) {
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mScannerCallback.handleSuccessfulResult(qrCode);
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}
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}
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private boolean initCamera(SurfaceHolder surfaceHolder) {
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final int numberOfCameras = Camera.getNumberOfCameras();
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Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
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try {
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for (int i = 0; i < numberOfCameras; ++i) {
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Camera.getCameraInfo(i, cameraInfo);
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if (cameraInfo.facing == CameraInfo.CAMERA_FACING_BACK) {
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mCamera = Camera.open(i);
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mCamera.setPreviewDisplay(surfaceHolder);
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mCameraOrientation = cameraInfo.orientation;
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break;
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}
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}
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if (mCamera == null) {
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Log.e(TAG, "Cannot find available back camera.");
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mScannerCallback.handleCameraFailure();
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return false;
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}
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setCameraParameter();
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if (!startPreview()) {
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Log.e(TAG, "Error to init Camera");
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mCamera = null;
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mScannerCallback.handleCameraFailure();
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return false;
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}
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return true;
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} catch (IOException e) {
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Log.e(TAG, "Error to init Camera");
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mCamera = null;
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mScannerCallback.handleCameraFailure();
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return false;
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}
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}
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}
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private QrYuvLuminanceSource getFrameImage(byte[] imageData) {
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final Rect frame = mScannerCallback.getFramePosition(mPreviewSize, mCameraOrientation);
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final Camera.Size size = mParameters.getPictureSize();
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QrYuvLuminanceSource image = new QrYuvLuminanceSource(imageData, size.width, size.height);
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return (QrYuvLuminanceSource)
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image.crop(frame.left, frame.top, frame.width(), frame.height());
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}
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@Override
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public void handleMessage(Message msg) {
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switch (msg.what) {
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case MSG_AUTO_FOCUS:
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// Calling autoFocus(null) will only trigger the camera to focus once. In order
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// to make the camera continuously auto focus during scanning, need to periodly
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// trigger it.
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mCamera.autoFocus(/* Camera.AutoFocusCallback */ null);
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sendMessageDelayed(obtainMessage(MSG_AUTO_FOCUS), AUTOFOCUS_INTERVAL_MS);
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break;
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default:
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Log.d(TAG, "Unexpected Message: " + msg.what);
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}
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}
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private Size getBestPreviewSize(Camera.Parameters parameters) {
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final Size windowSize = mScannerCallback.getViewSize();
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Size bestChoice = new Size(0, 0);
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for (Camera.Size size : parameters.getSupportedPreviewSizes()) {
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if (size.width <= windowSize.getWidth() && size.height <= windowSize.getHeight()) {
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bestChoice = new Size(size.width, size.height);
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break;
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}
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}
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return bestChoice;
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}
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@VisibleForTesting
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protected void decodeImage(BinaryBitmap image) {
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Result qrCode = null;
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try {
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qrCode = mReader.decodeWithState(image);
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} catch (ReaderException e) {
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} finally {
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mReader.reset();
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}
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if (qrCode != null) {
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mScannerCallback.handleSuccessfulResult(qrCode.getText());
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}
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}
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}
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