本文出自 “whithin's” 博客，请务必保留此出处http://whithin.blog.51cto.com/690417/1063573

1. add  below three permission into AndroidManifest.xml file

1. <uses-permissionandroid:name= "android.permission.CAMERA"/>

2. <uses-permissionandroid:name= "android.permission.RECORD_AUDIO"/>

3. <uses-permissionandroid:name= "android.permission.WRITE_EXTERNAL_STORAGE"/>

2. get a camera instance

1. /** A safe way to get an instance of the Camera object. */

2. publicstatic Camera getCameraInstance(){

3. Camera c = null;

4. try {

5. c = Camera. open(); // attempt to get a Camera instance

6. }

7. catch (Exception e){

8. // Camera is not available (in use or does not exist)

9. }

10. return c; // returns null if camera is unavailable

11. }

1. publicclass MediaRecorderActivity extends Activity {

2. publicstaticfinalint MEDIA_TYPE_IMAGE = 1;

3. publicstaticfinalint MEDIA_TYPE_VIDEO = 2;

4. private Camera mCamera;

5. private CameraPreview mPreview;

6. private MediaRecorder mMediaRecorder;

7. String TAG="CAMERAAPI";

8. boolean isRecording=false ;

9. @Override

10. publicvoid onCreate(Bundle savedInstanceState) {

11. super.onCreate(savedInstanceState);

12. setContentView(R.layout. main);

13. mCamera = getCameraInstance();

14. //        // Create our Preview view and set it as the content of our activity.

15. mPreview = new CameraPreview(this, mCamera);

16. FrameLayout preview = (FrameLayout) findViewById(R.id. camera_preview);

17. preview.addView( mPreview);

18. Button captureButton = (Button) findViewById(id. button_capture);

19. captureButton.setOnClickListener( new CaptureButtonOnClickListener());

20. }

21. publicclass CaptureButtonOnClickListener implements View.OnClickListener{

22. publicvoid onClick(View v) {

23. Button captureButton = (Button)v;

24. if (isRecording ) {

25. // stop recording and release camera

26. mMediaRecorder.stop();  // stop the recording

27. releaseMediaRecorder(); // release the MediaRecorder object

28. mCamera.lock();         // take camera access back from MediaRecorder

29. // inform the user that recording has stopped

30. captureButton.setText( "Capture");

31. isRecording = false ;

32. } else {

33. try{

34. // initialize video camera

35. if (prepareVideoRecorder()) {

36. // Camera is available and unlocked, MediaRecorder is prepared,

37. // now you can start recording

38. mMediaRecorder.start();

39. // inform the user that recording has started

40. captureButton.setText( "Stop");

41. isRecording = true ;

42. } else {

43. // prepare didn't work, release the camera

44. releaseMediaRecorder();

45. // inform user

46. }

47. } catch(Exception ex){

48. System. out.println(ex.toString());

49. ex.printStackTrace();

50. }

51. }

52. }

53. }

54. /** A safe way to get an instance of the Camera object. */

55. publicstatic Camera getCameraInstance(){

56. Camera c = null;

57. try {

58. c = Camera. open(); // attempt to get a Camera instance

59. }

60. catch (Exception e){

61. // Camera is not available (in use or does not exist)

62. }

63. return c; // returns null if camera is unavailable

64. }

65. /** Create a File for saving an p_w_picpath or video */

66. privatestatic File getOutputMediaFile(int type){

67. // To be safe, you should check that the SDCard is mounted

68. // using Environment.getExternalStorageState() before doing this.

69. File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(

70. Environment. DIRECTORY_PICTURES), "MyCameraApp" );

71. // This location works best if you want the created p_w_picpaths to be shared

72. // between applications and persist after your app has been uninstalled.

73. // Create the storage directory if it does not exist

74. if (! mediaStorageDir.exists()){

75. if (! mediaStorageDir.mkdirs()){

76. Log. d("MyCameraApp", "failed to create directory");

77. returnnull ;

78. }

79. }

80. // Create a media file name

81. String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss" ).format(new Date());

82. File mediaFile;

83. if (type == MEDIA_TYPE_IMAGE){

84. mediaFile = new File(mediaStorageDir.getPath() + File.separator +

85. "IMG_"+ timeStamp + ".jpg" );

86. } elseif (type == MEDIA_TYPE_VIDEO) {

87. mediaFile = new File(mediaStorageDir.getPath() + File.separator +

88. "VID_"+ timeStamp + ".mp4" );

89. } else {

90. returnnull ;

91. }

92. return mediaFile;

93. }

94. @Override

95. protectedvoid onPause() {

96. super.onPause();

97. releaseMediaRecorder();       // if you are using MediaRecorder, release it first

98. releaseCamera();              // release the camera immediately on pause event

99. }

100. privatevoid releaseCamera(){

101. if (mCamera != null){

102. mCamera.release();        // release the camera for other applications

103. mCamera = null;

104. }

105. }

106. privatevoid releaseMediaRecorder(){

107. if (mMediaRecorder != null) {

108. mMediaRecorder.reset();   // clear recorder configuration

109. mMediaRecorder.release(); // release the recorder object

110. mMediaRecorder = null ;

111. mCamera.lock();           // lock camera for later use

112. }

113. }

114. }

本文出自 “whithin's” 博客，请务必保留此出处http://whithin.blog.51cto.com/690417/1063573