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简单实现二维码 在导入Camera遇到一个问题 就是应该导入import android.hardware.Camera;

1. import java.io.ByteArrayOutputStream;  

2. import java.io.IOException;  

3. import java.util.Timer;  

4. import java.util.TimerTask;  

5.   

6. import android.app.Activity;  

7. import android.content.Context;  

8. import android.graphics.Bitmap;  

9. import android.graphics.BitmapFactory;  

10. import android.graphics.ImageFormat;  

11. import android.graphics.Rect;  

12. import android.graphics.YuvImage;  

13. import android.hardware.Camera;  

14. import android.os.Bundle;  

15. import android.util.Log;  

16. import android.view.Display;  

17. import android.view.SurfaceHolder;  

18. import android.view.SurfaceView;  

19. import android.view.WindowManager;  

20. import android.widget.ImageView;  

21.   

22. public class CameraTestActivity extends Activity implements SurfaceHolder.Callback {  

23.     private static String TAG = CameraTestActivity.class.getSimpleName();  

24.     private SurfaceHolder surfaceHolder;  

25.     private Camera camera;  

26.     private ImageView imageView;  

27.     private Timer mTimer;  

28.     private TimerTask mTimerTask;  

29.   

30.     private Camera.AutoFocusCallback mAutoFocusCallBack;  

31.     private Camera.PreviewCallback previewCallback;  

32.   

33.     /** Called when the activity is first created. */  

34.     @Override  

35.     public void onCreate(Bundle savedInstanceState) {  

36.         super.onCreate(savedInstanceState);  

37.         setContentView(R.layout.main);  

38.         SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view);  

39.         imageView = (ImageView) findViewById(R.id.image_view);  

40.         surfaceHolder = surfaceView.getHolder();  

41.         surfaceHolder.addCallback(this);  

42.         surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);  

43.         mAutoFocusCallBack = new Camera.AutoFocusCallback() {  

44.             @Override  

45.             public void onAutoFocus(boolean success, Camera camera) {  

46.                 if (success) {  

47.                     // isAutoFocus = true;  

48.                     camera.setOneShotPreviewCallback(previewCallback);  

49.                     Log.d(TAG, "onAutoFocus success");  

50.                 }  

51.             }  

52.         };  

53.   

54.         previewCallback = new Camera.PreviewCallback() {  

55.             @Override  

56.             public void onPreviewFrame(byte[] data, Camera arg1) {  

57.                 if (data != null)  

58.                 {  

59.                     Camera.Parameters parameters = camera.getParameters();  

60.                     int imageFormat = parameters.getPreviewFormat();  

61.                     Log.i("map", "Image Format: " + imageFormat);  

62.   

63.                     Log.i("CameraPreviewCallback", "data length:" + data.length);  

64.                     if (imageFormat == ImageFormat.NV21)  

65.                     {  

66.                         // get full picture  

67.                         Bitmap image = null;  

68.                         int w = parameters.getPreviewSize().width;  

69.                         int h = parameters.getPreviewSize().height;  

70.                             

71.                         Rect rect = new Rect(0, 0, w, h);   

72.                         YuvImage img = new YuvImage(data, ImageFormat.NV21, w, h, null);  

73.                         ByteArrayOutputStream baos = new ByteArrayOutputStream();  

74.                         if (img.compressToJpeg(rect, 100, baos))   

75.                         {   

76.                             image =  BitmapFactory.decodeByteArray(baos.toByteArray(), 0, baos.size());  

77.                             imageView.setImageBitmap(image);  

78.                         }  

79.                   

80.                     }  

81.                 }  

82.             }  

83.         };  

84.   

85.         mTimer = new Timer();  

86.         mTimerTask = new CameraTimerTask();  

87.         mTimer.schedule(mTimerTask, 0, 500);  

88.     }  

89.   

90.     @Override  

91.     public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {  

92.         // TODO Auto-generated method stub  

93.     }  

94.   

95.     @Override  

96.     public void surfaceCreated(SurfaceHolder arg0) {  

97.         // TODO Auto-generated method stub  

98.         initCamera();  

99.     }  

100.   

101.     @Override  

102.     public void surfaceDestroyed(SurfaceHolder arg0) {  

103.         // TODO Auto-generated method stub  

104.         if (camera != null) {  

105.             camera.stopPreview();  

106.             camera.release();  

107.             camera = null;  

108.         }  

109.         previewCallback = null;  

110.         mAutoFocusCallBack = null;  

111.     }  

112.   

113.     public void initCamera() {  

114.         camera = Camera.open();  

115.         Camera.Parameters parameters = camera.getParameters();  

116.         WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE); // 获取当前屏幕管理器对象  

117.         Display display = wm.getDefaultDisplay(); // 获取屏幕信息的描述类  

118.         parameters.setPreviewSize(display.getWidth(), display.getHeight());  

119.         camera.setParameters(parameters);  

120.         try {  

121.             camera.setPreviewDisplay(surfaceHolder);  

122.         } catch (IOException e) {  

123.             System.out.println(e.getMessage());  

124.         }  

125.         camera.startPreview();  

126.     }  

127.   

128.     class CameraTimerTask extends TimerTask {  

129.         @Override  

130.         public void run() {  

131.             if (camera != null) {  

132.                 camera.autoFocus(mAutoFocusCallBack);  

133.             }  

134.         }  

135.     }  

136. } 

转载于:https://my.oschina.net/u/3407708/blog/1358218