Pileus Git - ~andy/freeotp/blob - src/org/fedorahosted/freeotp/CameraDialogFragment.java

   1 /*
   2  * FreeOTP
   3  *
   4  * Authors: Nathaniel McCallum <npmccallum@redhat.com>
   5  *
   6  * Copyright (C) 2013  Nathaniel McCallum, Red Hat
   7  *
   8  * Licensed under the Apache License, Version 2.0 (the "License");
   9  * you may not use this file except in compliance with the License.
  10  * You may obtain a copy of the License at
  11  *
  12  *     http://www.apache.org/licenses/LICENSE-2.0
  13  *
  14  * Unless required by applicable law or agreed to in writing, software
  15  * distributed under the License is distributed on an "AS IS" BASIS,
  16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  17  * See the License for the specific language governing permissions and
  18  * limitations under the License.
  19  */
  20
  21 package org.fedorahosted.freeotp;
  22
  23 import java.util.List;
  24
  25 import android.annotation.TargetApi;
  26 import android.app.AlertDialog;
  27 import android.app.Dialog;
  28 import android.content.DialogInterface;
  29 import android.hardware.Camera;
  30 import android.hardware.Camera.CameraInfo;
  31 import android.hardware.Camera.Parameters;
  32 import android.os.Bundle;
  33 import android.os.Handler;
  34 import android.os.Message;
  35 import android.view.Surface;
  36 import android.view.SurfaceHolder;
  37 import android.view.SurfaceView;
  38 import android.view.View;
  39 import android.widget.TextView;
  40
  41 public class CameraDialogFragment extends BaseAlertDialogFragment
  42                         implements SurfaceHolder.Callback, Camera.AutoFocusCallback {
  43         public static final String FRAGMENT_TAG = "fragment_camera";
  44
  45         private final CameraInfo mCameraInfo = new CameraInfo();
  46         private final DecodeAsyncTask mDecodeAsyncTask;
  47         private final int mCameraId;
  48         private Handler mHandler;
  49         private Camera mCamera;
  50
  51         public CameraDialogFragment() {
  52                 super(R.string.scan_qr_code, R.layout.camera,
  53                         android.R.string.cancel, R.string.manual_entry, 0);
  54
  55                 // Find a back-facing camera
  56                 int cameraId;
  57                 for (cameraId = Camera.getNumberOfCameras() - 1; cameraId >= 0; cameraId--) {
  58                         Camera.getCameraInfo(cameraId, mCameraInfo);
  59                         if (mCameraInfo.facing == CameraInfo.CAMERA_FACING_BACK)
  60                                 break;
  61                 }
  62                 mCameraId = cameraId;
  63
  64                 // Create the decoder thread
  65                 mDecodeAsyncTask = new DecodeAsyncTask() {
  66                         @Override
  67                         protected void onPostExecute(String result) {
  68                                 super.onPostExecute(result);
  69                                 if (result != null)
  70                                         ((MainActivity) getActivity()).tokenURIReceived(result);
  71                                 dismiss();
  72                         }
  73                 };
  74         }
  75
  76         @Override
  77         public void onCreate(Bundle savedInstanceState) {
  78                 super.onCreate(savedInstanceState);
  79
  80                 // If we have no back facing camera, open the manual dialog
  81                 if (mCameraId < 0) {
  82                         new ManualDialogFragment().show(getFragmentManager(),
  83                                         ManualDialogFragment.FRAGMENT_TAG);
  84                         dismiss();
  85                         return;
  86                 }
  87
  88                 mDecodeAsyncTask.execute();
  89         }
  90
  91         @Override
  92         public void onDestroy() {
  93                 super.onDestroy();
  94                 mDecodeAsyncTask.cancel(true);
  95         }
  96
  97         @Override
  98         protected void onViewInflated(View view) {
  99                 SurfaceView sv = (SurfaceView) view.findViewById(R.id.camera_surfaceview);
 100                 sv.getHolder().addCallback(this);
 101         }
 102
 103         @Override
 104         public void onClick(DialogInterface dialog, int which) {
 105                 if (which != AlertDialog.BUTTON_NEUTRAL)
 106                         return;
 107
 108                 new ManualDialogFragment().show(getFragmentManager(),
 109                                 ManualDialogFragment.FRAGMENT_TAG);
 110         }
 111
 112         @Override
 113         public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
 114                 if (mCamera == null)
 115                         return;
 116
 117                 int rotation = 0;
 118                 switch (getActivity().getWindowManager().getDefaultDisplay().getRotation()) {
 119                 case Surface.ROTATION_0:
 120                         rotation = 0;
 121                         break;
 122                 case Surface.ROTATION_90:
 123                         rotation = 90;
 124                         break;
 125                 case Surface.ROTATION_180:
 126                         rotation = 180;
 127                         break;
 128                 case Surface.ROTATION_270:
 129                         rotation = 270;
 130                         break;
 131                 }
 132
 133                 mCamera.setDisplayOrientation((mCameraInfo.orientation - rotation + 360) % 360);
 134                 mCamera.startPreview();
 135
 136                 if (mHandler != null)
 137                         mHandler.sendEmptyMessageDelayed(0, 100);
 138         }
 139
 140         @Override
 141         @TargetApi(14)
 142         public void surfaceCreated(SurfaceHolder holder) {
 143                 surfaceDestroyed(holder);
 144
 145                 try {
 146                         // Open the camera
 147                         mCamera = Camera.open(mCameraId);
 148                         mCamera.setPreviewDisplay(holder);
 149                         mCamera.setPreviewCallback(mDecodeAsyncTask);
 150                 } catch (Exception e) {
 151                         e.printStackTrace();
 152                         surfaceDestroyed(holder);
 153
 154                         // Show error message
 155                         Dialog d = getDialog();
 156                         SurfaceView sv = (SurfaceView) d.findViewById(R.id.camera_surfaceview);
 157                         TextView tv = (TextView) d.findViewById(R.id.camera_textview);
 158                         sv.setVisibility(View.INVISIBLE);
 159                         tv.setVisibility(View.VISIBLE);
 160                         return;
 161                 }
 162
 163                 // Set auto-focus mode
 164                 Parameters params = mCamera.getParameters();
 165                 List<String> modes = params.getSupportedFocusModes();
 166                 if (modes.contains(Parameters.FOCUS_MODE_CONTINUOUS_PICTURE))
 167                         params.setFocusMode(Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
 168                 else if (modes.contains(Parameters.FOCUS_MODE_CONTINUOUS_VIDEO))
 169                         params.setFocusMode(Parameters.FOCUS_MODE_CONTINUOUS_VIDEO);
 170                 else if (modes.contains(Parameters.FOCUS_MODE_AUTO)) {
 171                         params.setFocusMode(Parameters.FOCUS_MODE_AUTO);
 172                         mHandler = new Handler() {
 173                                 @Override
 174                                 public void handleMessage(Message msg) {
 175                                         super.handleMessage(msg);
 176                                         mCamera.autoFocus(CameraDialogFragment.this);
 177                                 }
 178                         };
 179                 }
 180                 mCamera.setParameters(params);
 181         }
 182
 183         @Override
 184         public void surfaceDestroyed(SurfaceHolder holder) {
 185                 if (mCamera == null)
 186                         return;
 187
 188                 if (mHandler != null) {
 189                         mCamera.cancelAutoFocus();
 190                         mHandler.removeMessages(0);
 191                         mHandler = null;
 192                 }
 193
 194                 mCamera.stopPreview();
 195                 mCamera.setPreviewCallback(null);
 196                 mCamera.release();
 197                 mCamera = null;
 198         }
 199
 200         @Override
 201         public void onAutoFocus(boolean success, Camera camera) {
 202                 if (mHandler != null)
 203                         mHandler.sendEmptyMessageDelayed(0, 1000);
 204         }
 205 }