本文实例为大家分享了Android实现摄像头切换，拍照及保存到相册，预览等功能，解决android7拍照之后不能连续预览的问题、参数设置相关问题以及前后摄像头语言颠倒等问题。
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
|
import android.Manifest; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.content.pm.PackageManager; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Matrix; import android.graphics.PixelFormat; import android.hardware.Camera; import android.net.Uri; import android.os.Build; import android.os.Bundle; import android.os.Environment; import android.os.Handler; import android.support.v4.app.ActivityCompat; import android.util.Log; import android.view.KeyEvent; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.View; import android.view.WindowManager; import android.widget.TextView; import com.hama.tracker.R; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.util.ArrayList; import java.util.Iterator; import java.util.List; public class CamaraActivity extends Activity implements View.OnClickListener { @Bind(R.id.return_back) TextView returnBack; @Bind(R.id.tvswitch_camera) TextView tvswitchCamera; //启动摄像机 private Camera mCamera; public boolean isopen_camara = false; private SurfaceView surfaceView; private SurfaceHolder mholder = null; private SurfaceCallback previewCallBack; private boolean isTakingPhoto;//是否正在拍照 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); verifyPermission(new String[]{Manifest.permission.CAMERA}); // getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); setContentView(R.layout.activity_camara); ButterKnife.bind(this); // 预览控件 surfaceView = (SurfaceView) this .findViewById(R.id.surfaceView); // 设置参数 surfaceView.getHolder().setKeepScreenOn(true); surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); returnBack.setOnClickListener(this); tvswitchCamera.setOnClickListener(this); EventBus.getDefault().register(this); } public void verifyPermission(String[] permissions) { if (permissions != null) { List<String> lists = new ArrayList<>(); for (int i = 0; i < permissions.length; i++) { if (ActivityCompat.checkSelfPermission(this, permissions[i]) != PackageManager.PERMISSION_GRANTED) { if (ActivityCompat.shouldShowRequestPermissionRationale(this, permissions[i])) { } lists.add(permissions[i]); } } if (lists.size() > 0) { String[] ps = new String[lists.size()]; for (int i = 0; i < lists.size(); i++) { ps[i] = lists.get(i); } ActivityCompat.requestPermissions(this, ps, 1); } } } @Override protected void onRestart() { super.onRestart(); } @Override protected void onStart() { super.onStart(); } private void takePhoto() { if (!isopen_camara) { previewCallBack = new SurfaceCallback(); surfaceView.getHolder().addCallback(previewCallBack); } else { autoTakePhoto(); } } @Override protected void onResume() { super.onResume(); if(mCamera == null){ if (!isopen_camara) { previewCallBack = new SurfaceCallback(); surfaceView.getHolder().addCallback(previewCallBack); } } } @Override public void onClick(View v) { switch (v.getId()) { case R.id.return_back: finish(); break; case R.id.tvswitch_camera: switchCamara(); break; } } // 预览界面回调 private final class SurfaceCallback implements SurfaceHolder.Callback { // 预览界面被创建 public void surfaceCreated(SurfaceHolder holder) { try { //1代表打开后置摄像头,0代表打开前置摄像头. mCamera = Camera.open(cameraPosition);// 打开摄像头 setParams(holder,cameraPosition); } catch (Exception e) { e.printStackTrace(); if (mCamera != null) { mCamera.stopPreview(); mCamera.lock(); mCamera.release(); mCamera = null; } finish(); //Toast.makeText(getApplicationContext(), "该手机不支持自动拍照功能", Toast.LENGTH_LONG).show(); } } public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { System.out.println("surfaceChanged"); isopen_camara = true; //autoTakePhoto(); } // 预览界面被销毁 public void surfaceDestroyed(SurfaceHolder holder) { System.out.println("surfaceDestroyed"); if(!isopen_camara) return; if (mCamera != null) { holder.removeCallback(this); mCamera.setPreviewCallback(null); mCamera.stopPreview(); mCamera.lock(); mCamera.release(); mCamera = null; } } } public void reset(){ Camera.CameraInfo cameraInfo = new Camera.CameraInfo(); if (mCamera != null) { if(surfaceView != null && surfaceView.getHolder() != null && previewCallBack != null){ surfaceView.getHolder().removeCallback(previewCallBack); } mCamera.setPreviewCallback(null); mCamera.stopPreview(); mCamera.lock(); mCamera.release(); mCamera = null; mCamera = Camera.open(cameraPosition); if (null != mholder) setParams(mholder,cameraInfo.facing); } } @Override protected void onDestroy() { super.onDestroy(); if (mCamera != null) { if(surfaceView != null && surfaceView.getHolder() != null && previewCallBack != null){ surfaceView.getHolder().removeCallback(previewCallBack); } mCamera.setPreviewCallback(null); mCamera.stopPreview(); mCamera.lock(); mCamera.release(); mCamera = null; } ButterKnife.unbind(this); EventBus.getDefault().unregister(this); } private void setParams(SurfaceHolder mySurfaceView,int postion) { try { int PreviewWidth = 0; int PreviewHeight = 0; WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);//获取窗口的管理器 /*PreviewWidth = display.(); PreviewHeight = display.getHeight();*/ Camera.Parameters parameters = mCamera.getParameters(); // 选择合适的预览尺寸 List<Camera.Size> sizeList = parameters.getSupportedPreviewSizes(); // 如果sizeList只有一个我们也没有必要做什么了，因为就他一个别无选择 if (sizeList.size() > 1) { Iterator<Camera.Size> itor = sizeList.iterator(); while (itor.hasNext()) { Camera.Size cur = itor.next(); /*if (cur.width >= PreviewWidth && cur.height >= PreviewHeight) {*/ if (cur.width >= PreviewWidth && cur.height >= PreviewHeight) { PreviewWidth = cur.width; PreviewHeight = cur.height; break; } } } parameters.setPreviewSize(PreviewWidth, PreviewHeight); //获得摄像区域的大小 //parameters.setPreviewFrameRate(3);//每秒3帧 每秒从摄像头里面获得3个画面 //parameters.setPreviewFpsRange(3,); List<int[]> list = parameters.getSupportedPreviewFpsRange(); int[] v = null; int index = 0; int min = 0; for (int i = 0; i < list.size(); i++) { v = list.get(i); if (v[0] > min) { min = v[0]; index = i; } } parameters.setPreviewFpsRange(list.get(index)[0], list.get(index)[1]); parameters.setPictureFormat(PixelFormat.JPEG);//设置照片输出的格式 parameters.set("jpeg-quality", 85);//设置照片质量 parameters.setPictureSize(PreviewWidth, PreviewHeight);//设置拍出来的屏幕大小 parameters.setRotation(180); //Java部分 if (Build.VERSION.SDK_INT >= 24) { if(postion == 0){ mCamera.setDisplayOrientation(90); }else { mCamera.setDisplayOrientation(270); } } else { mCamera.setDisplayOrientation(90); } mCamera.setParameters(parameters);//把上面的设置 赋给摄像头 mCamera.setPreviewDisplay(mySurfaceView);//把摄像头获得画面显示在SurfaceView控件里面 mholder = mySurfaceView; mCamera.setPreviewCallback(new Camera.PreviewCallback() { @Override public void onPreviewFrame(byte[] data, Camera camera) { } }); mCamera.startPreview();//开始预览 // mPreviewRunning = true; } catch (IOException e) { Log.e("tag", e.toString()); } } Handler handler = null; private void autoTakePhoto() { // 拍照前需要对焦 获取清析的图片 if (null == mCamera) return; mCamera.autoFocus(new Camera.AutoFocusCallback() { @Override public void onAutoFocus(boolean success, Camera camera) { if (success && isopen_camara) { // 对焦成功 // Toast.makeText(MainActivity.this, "对焦成功 !!",Toast.LENGTH_SHORT).show(); if(!isTakingPhoto) { isTakingPhoto = true; handler = new Handler(); handler.post(new Runnable() { @Override public void run() { mCamera.takePicture(null, null, new MyPictureCallback()); } }); } } } }); } // 照片回调 private final class MyPictureCallback implements Camera.PictureCallback { // 照片生成后 @Override public void onPictureTaken(byte[] data, Camera camera) { try { Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length); Matrix matrix = new Matrix(); matrix.setRotate(270); File jpgFile = new File(Environment.getExternalStorageDirectory() + "/DCIM/camera"); if (!jpgFile.exists()) { jpgFile.mkdir(); } File jpgFile1 = new File(jpgFile.getAbsoluteFile(), System.currentTimeMillis() + ".jpg"); bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true); FileOutputStream fos = new FileOutputStream(jpgFile1); bitmap.compress(Bitmap.CompressFormat.JPEG, 80, fos); ToastUtils.show(getApplicationContext(), getString(R.string.save_success)); fos.close(); Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE); Uri uri = Uri.fromFile(jpgFile1); intent.setData(uri); sendBroadcast(intent); } catch (Exception e) { e.printStackTrace(); }finally { if(Build.VERSION.SDK_INT>=24){ reset(); } isTakingPhoto = false; } } } private int cameraPosition = 1;//0代表前置摄像头，1代表后置摄像头 private void switchCamara() { //切换前后摄像头 int cameraCount = 0; Camera.CameraInfo cameraInfo = new Camera.CameraInfo(); cameraCount = Camera.getNumberOfCameras();//得到摄像头的个数 for (int i = 0; i < cameraCount; i++) { Camera.getCameraInfo(i, cameraInfo);//得到每一个摄像头的信息 if (cameraPosition == 1) { //现在是后置，变更为前置 if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {//代表摄像头的方位，CAMERA_FACING_FRONT前置 CAMERA_FACING_BACK后置 if(surfaceView != null && surfaceView.getHolder() != null && previewCallBack != null){ surfaceView.getHolder().removeCallback(previewCallBack); } mCamera.setPreviewCallback(null); mCamera.stopPreview();//停掉原来摄像头的预览 mCamera.lock(); mCamera.release();//释放资源 mCamera = null;//取消原来摄像头 mCamera = Camera.open(i);//打开当前选中的摄像头 /* try { if (null != mholder) mCamera.setPreviewDisplay(mholder);//通过surfaceview显示取景画面 } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } mCamera.startPreview();//开始预览*/ if (null != mholder) setParams(mholder,Camera.CameraInfo.CAMERA_FACING_BACK); cameraPosition = 0; break; } } else { //现在是前置， 变更为后置 if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {//代表摄像头的方位，CAMERA_FACING_FRONT前置 CAMERA_FACING_BACK后置 if(surfaceView != null && surfaceView.getHolder() != null && previewCallBack != null){ surfaceView.getHolder().removeCallback(previewCallBack); } mCamera.setPreviewCallback(null); mCamera.stopPreview();//停掉原来摄像头的预览 mCamera.lock(); mCamera.release();//释放资源 mCamera = null;//取消原来摄像头 mCamera = Camera.open(i);//打开当前选中的摄像头 /*try { if (null != mholder) mCamera.setPreviewDisplay(mholder);//通过surfaceview显示取景画面 } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } mCamera.startPreview();//开始预览*/ if (null != mholder) setParams(mholder,Camera.CameraInfo.CAMERA_FACING_FRONT); cameraPosition = 1; break; } } } } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {///音量减拍照 takePhoto(); return true; } return super.onKeyDown(keyCode, event); } } |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/chengjiamei/article/details/54895723
