Mercurial > repos > other > AceTorch

annotate src/uk/co/ibboard/acetorch/AceTorchActivity.java @ 2:de6a63e771dc

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Code cleanup
author IBBoard <dev@ibboard.co.uk>
date Mon, 29 Oct 2012 11:59:17 +0000
parents 4a66834572d1
children 1c0184311e64
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1 // This file (AceTorchActivity.java) is a part of the AceTorch project and is copyright 2012 IBBoard
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2 //
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3 // The file and the library/program it is in are licensed and distributed, without warranty, under the GNU GPL, either version 3 of the License or (at your option) any later version. Please see COPYING for more information and the full license.
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4
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5 package uk.co.ibboard.acetorch;
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6
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7 import android.app.Activity;
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8 import android.hardware.Camera;
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9 import android.hardware.Camera.Parameters;
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10 import android.os.Bundle;
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11 import android.view.View;
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12 import android.widget.Toast;
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13 import android.widget.ToggleButton;
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14
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15 public class AceTorchActivity extends Activity {
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16 private Camera _camera;
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17
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18 /** Called when the activity is first created. */
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19 @Override
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20 public void onCreate(Bundle savedInstanceState) {
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21 super.onCreate(savedInstanceState);
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22 setContentView(R.layout.main);
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23 }
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24
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25 public void onToggleClicked(View view) {
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26 setLightState();
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27 }
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28
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29 private boolean desiredTorchStateIsOn() {
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30 View view = findViewById(R.id.toggleTorch);
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31 return ((ToggleButton) view).isChecked();
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32 }
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33
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34 private void setLightState() {
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35 if (desiredTorchStateIsOn()) {
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36 enableLight();
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37 } else {
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38 disableLight();
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39 }
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40 }
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41
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42 // Correct ordering of the following API calls was a combination of
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43 // 1) Pedro Rainho's post (http://stackoverflow.com/a/9751674/283242 - initial "flash mode on" trick)
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44 // 2) Sham's post (http://stackoverflow.com/a/10253946/283242 - auto-focus just after start preview)
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45 // 3) A reasonable amount of trial and error
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46 private void enableLight() {
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47 initCamera();
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48
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49 if (_camera == null) {
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50
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51 Toast.makeText(this, "Unable to get camera", Toast.LENGTH_LONG);
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52 return;
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53 }
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54
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55 _camera.startPreview();
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56
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57 Parameters params = _camera.getParameters();
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58 params.setFlashMode(Parameters.FLASH_MODE_ON);
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59 params.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
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60 _camera.setParameters(params);
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61
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62 _camera.startPreview();
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63
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64 _camera.autoFocus(null);
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65
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66 params = _camera.getParameters();
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67 params.setFlashMode(Parameters.FLASH_MODE_OFF);
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68 _camera.setParameters(params);
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69 }
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70
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71 private void disableLight() {
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72 if (_camera != null) {
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73 _camera.stopPreview();
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74 _camera.release();
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75 _camera = null;
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76 }
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77 }
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78
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79 @Override
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80 protected void onPause() {
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81 super.onPause();
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82 disableLight();
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83 }
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84
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85 @Override
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86 protected void onResume() {
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87 setLightState();
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88 super.onResume();
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89 }
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90
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91 private void initCamera() {
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92 if (_camera == null) {
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93 _camera = getCameraInstance();
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94 }
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95 }
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96
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97 /** A safe way to get an instance of the Camera object.
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98 * (Taken from Google documentation) */
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99 private static Camera getCameraInstance() {
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100 Camera c = null;
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101 try {
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102 c = Camera.open(); // attempt to get a Camera instance
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103 } catch (Exception e) {
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104 // Camera is not available (in use or does not exist)
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105 }
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106 return c; // returns null if camera is unavailable
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107 }
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108
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109 }