1 //定制拍照：
2 public class MainActivity extends Activity {
3 private Camera mCamera;
4 private Preview mPreview;
5
6 @Override
7 protected void onCreate(Bundle savedInstanceState) {
8 super.onCreate(savedInstanceState);
9 // setContentView(R.layout.fragment_main);
10 // 隐藏标题
11 requestWindowFeature(Window.FEATURE_NO_TITLE);
12 // 设置为全屏
13 getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
14 mPreview = new Preview(this);
15 setContentView(mPreview);
16 }
17
18 @Override
19 protected void onResume() {
20 // TODO Auto-generated method stub
21 super.onResume();
22 // 第一步：打开照相机
23 mCamera = Camera.open(0);
24 mPreview.setCamera(mCamera);
25 }
26
27 // 释放焦点
28 @Override
29 protected void onPause() {
30 // TODO Auto-generated method stub
31 super.onPause();
32 if (mCamera != null) {
33 mCamera.release();
34 mCamera = null;
35 mPreview.setCamera(null);
36 }
37 }
38
39 // 第三步：添加回调事件监听器SurfaceHolder.addCallback
40 class Preview extends ViewGroup implements SurfaceHolder.Callback,
41 OnClickListener {
42 SurfaceView mSurfaceView;
43 SurfaceHolder mHolder;
44 Size mPreviewSize;
45 List<Size> msupportedPreviewSizes;
46 Camera mCamera;
47 Context mContext;
48
49 public Preview(Context context) {
50 super(context);
51 // TODO Auto-generated constructor stub
52 mContext = context;
53 mSurfaceView = new SurfaceView(context);
54 addView(mSurfaceView);
55 mHolder = mSurfaceView.getHolder();
56 mHolder.addCallback(this);
57 }
58
59 public void setCamera(Camera camera) {
60 mCamera = camera;
61 if (mCamera != null) {
62 // 获得所有预览尺寸
63 msupportedPreviewSizes = mCamera.getParameters()
64 .getSupportedPictureSizes();
65 requestLayout();
66
67 }
68 }
69
70 @Override
71 public void surfaceCreated(SurfaceHolder holder) {
72 // TODO Auto-generated method stub
73 try {
74 if (mCamera != null) {
75 // 将Camera和SurfaceView关联
76 mCamera.setPreviewDisplay(holder);
77 }
78 } catch (Exception e) {
79 // TODO: handle exception
80 }
81 }
82
83 private PictureCallback mpPictureCallback = new PictureCallback() {
84
85 @Override
86 public void onPictureTaken(byte[] data, Camera camera) {
87 mCamera.startPreview();
88 File pictureFile = new File("/sdcard/image.jpg");
89 try {
90 FileOutputStream fos = new FileOutputStream(pictureFile);
91 fos.write(data);
92 fos.close();
93 } catch (Exception e) {
94 // TODO: handle exception
95 }
96 }
97 };
98
99 @Override
100 public void surfaceChanged(SurfaceHolder holder, int format, int width,
101 int height) {
102
103 // 设置最佳预览尺寸
104 Camera.Parameters parameters = mCamera.getParameters();
105
106 parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
107
108 mCamera.setParameters(parameters);
109 mCamera.startPreview();
110 }
111
112 @Override
113 public void surfaceDestroyed(SurfaceHolder holder) {
114 // TODO Auto-generated method stub
115 if (mCamera != null) {
116 mCamera.stopPreview();
117 }
118 }
119
120 @Override
121 protected void onLayout(boolean changed, int l, int t, int r, int b) {
122 // 使预览和实际窗口大小一致
123 if (changed && getChildCount() > 0) {
124 final View child = getChildAt(0);
125 int width = r - l;
126 int height = b - t;
127 int previewWidth = width;
128 int previewHeight = height;
129 if (mPreviewSize != null) {
130 previewWidth = mPreviewSize.width;
131 previewHeight = mPreviewSize.height;
132
133 }
134 // 手机屏幕的宽高比大于采集图像的宽高比
135 if (width * previewHeight > height * previewWidth) {
136 final int scaledChildWidth = previewWidth * height
137 / previewHeight;
138 // child.layout((width - scaledChildWidth) / 2, 0,
139 // (width + scaledChildWidth) / 2, height);
140 child.layout(100, 100, 340, 240);// 设置照相框位置
141 } else {
142 final int scaledChildHeight = previewWidth * width
143 / previewWidth;
144 child.layout(0, (height - scaledChildHeight) / 2, width,
145 (height + scaledChildHeight) / 2);
146 }
147 }
148
149 }
150
151 private Size getOptimalPreviewSize(List<Size> sizes, int w, int h) {
152
153 double ASPECT_TOLERANCE = 0.1;
154 double targetRatio = (double) w / h;
155 if (sizes == null) {
156 return null;
157 }
158 Size optimalSize = null;
159 double minDiff = Double.MAX_VALUE;
160 int targetHeight = h;
161 for (Size size : sizes) {
162
163 double ratio = (double) size.width / size.height;
164 if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) {
165 continue;
166 }
167 if (Math.abs(size.height - targetHeight) < minDiff) {
168 optimalSize = size;
169 minDiff = Math.abs(size.height - targetHeight);
170 }
171
172 }
173 if (optimalSize == null) {
174 minDiff = Double.MAX_VALUE;
175 for (Size size : sizes) {
176
177 if (Math.abs(size.height - targetHeight) < minDiff) {
178 optimalSize = size;
179 minDiff = Math.abs(size.height - targetHeight);
180 }
181
182 }
183 }
184
185 return optimalSize;
186
187 }
188
189 @Override
190 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
191 // TODO Auto-generated method stub
192 super.onMeasure(widthMeasureSpec, heightMeasureSpec);
193 int width = resolveSize(getSuggestedMinimumWidth(),
194 widthMeasureSpec);
195 int height = resolveSize(getSuggestedMinimumHeight(),
196 heightMeasureSpec);
197 setMeasuredDimension(width, height);
198 if (msupportedPreviewSizes != null) {
199 mPreviewSize = getOptimalPreviewSize(msupportedPreviewSizes,
200 width, height);
201 }
202
203 }
204
205 @Override
206 public void onClick(View v) {
207 // TODO Auto-generated method stub
208 mCamera.takePicture(null, null, mpPictureCallback);
209 }
210
211 }
212
213 }
