Android 调用前后摄像头同时拍照

AndroidMainfest.xml文件（需要camera权限）：

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

activity_main.xml文件：

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xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context="com.bihu.qdemopush.MainActivity">   <LinearLayout   android:layout_width="match_parent"   android:layout_height="200dp"   android:orientation="horizontal">   <SurfaceView     android:id="@+id/surfaceview1"     android:layout_width="0dp"     android:layout_weight="1"     android:layout_height="fill_parent" />   <SurfaceView     android:id="@+id/surfaceview2"     android:layout_width="0dp"     android:layout_weight="1"     android:layout_marginLeft="5dp"     android:layout_height="fill_parent" /> LinearLayout> LinearLayout>

MainActivity.java文件：主要是对2个surfaceView的显示渲染

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public class MainActivity extends AppCompatActivity {   SurfaceView surfaceview1, surfaceview2; SurfaceHolder surfaceholder1, surfaceholder2; String TAG = "MainActivity"; private Camera camera1 = null, camera2; Camera.Parameters parameters;   @Override protected void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.activity_main);     surfaceview1 = (SurfaceView) findViewById(R.id.surfaceview1);   surfaceview2 = (SurfaceView) findViewById(R.id.surfaceview2);   surfaceholder1 = surfaceview1.getHolder();   surfaceholder1.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);   surfaceholder1.addCallback(new surfaceholderCallbackBack());     surfaceholder2 = surfaceview2.getHolder();   surfaceholder2.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);   surfaceholder2.addCallback(new surfaceholderCallbackFont()); }   @Override protected void onDestroy() {   Log.e(TAG, "onDestroy");   super.onDestroy(); }   /**  * 后置摄像头回调  */ class surfaceholderCallbackBack implements SurfaceHolder.Callback {   @Override   public void surfaceCreated(SurfaceHolder holder) {     // 获取camera对象     int cameraCount = Camera.getNumberOfCameras();     if (cameraCount > 0) {       camera1 = Camera.open(0);       try {         // 设置预览监听         camera1.setPreviewDisplay(holder);         Camera.Parameters parameters = camera1.getParameters();           if (MainActivity.this.getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE) {           parameters.set("orientation", "portrait");           camera1.setDisplayOrientation(90);           parameters.setRotation(90);         } else {           parameters.set("orientation", "landscape");           camera1.setDisplayOrientation(0);           parameters.setRotation(0);         }         camera1.setParameters(parameters);         // 启动摄像头预览         camera1.startPreview();         System.out.println("camera.startpreview");         } catch (IOException e) {         e.printStackTrace();         camera1.release();         System.out.println("camera.release");       }     }   }     @Override   public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {     camera1.autoFocus(new Camera.AutoFocusCallback() {       @Override       public void onAutoFocus(boolean success, Camera camera) {         if (success) {           initCamera();// 实现相机的参数初始化           camera.cancelAutoFocus();// 只有加上了这一句，才会自动对焦。         }       }     });     }     @Override   public void surfaceDestroyed(SurfaceHolder holder) {     }     // 相机参数的初始化设置   private void initCamera() {     parameters = camera1.getParameters();     parameters.setPictureFormat(PixelFormat.JPEG);     parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);// 1连续对焦     setDispaly(parameters, camera1);     camera1.setParameters(parameters);     camera1.startPreview();     camera1.cancelAutoFocus();// 2如果要实现连续的自动对焦，这一句必须加上   }     // 控制图像的正确显示方向   private void setDispaly(Camera.Parameters parameters, Camera camera) {     if (Integer.parseInt(Build.VERSION.SDK) >= 8) {       setDisplayOrientation(camera, 90);     } else {       parameters.setRotation(90);     }     }     // 实现的图像的正确显示   private void setDisplayOrientation(Camera camera, int i) {     Method downPolymorphic;     try {       downPolymorphic = camera.getClass().getMethod("setDisplayOrientation", new Class[]{int.class});       if (downPolymorphic != null) {         downPolymorphic.invoke(camera, new Object[]{i});       }     } catch (Exception e) {       Log.e("Came_e", "图像出错");     }   } }   class surfaceholderCallbackFont implements SurfaceHolder.Callback {   @Override   public void surfaceCreated(SurfaceHolder holder) {     // 获取camera对象     int cameraCount = Camera.getNumberOfCameras();     if (cameraCount == 2) {       camera2 = Camera.open(1);     }     try {       // 设置预览监听       camera2.setPreviewDisplay(holder);       Camera.Parameters parameters = camera2.getParameters();         if (MainActivity.this.getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE) {         parameters.set("orientation", "portrait");         camera2.setDisplayOrientation(90);         parameters.setRotation(90);       } else {         parameters.set("orientation", "landscape");         camera2.setDisplayOrientation(0);         parameters.setRotation(0);       }       camera2.setParameters(parameters);       // 启动摄像头预览       camera2.startPreview();       System.out.println("camera.startpreview");       } catch (IOException e) {       e.printStackTrace();       camera2.release();       System.out.println("camera.release");     }   }     @Override   public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {     camera2.autoFocus(new Camera.AutoFocusCallback() {       @Override       public void onAutoFocus(boolean success, Camera camera) {         if (success) {           parameters = camera2.getParameters();           parameters.setPictureFormat(PixelFormat.JPEG);           parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);// 1连续对焦           setDispaly(parameters, camera2);           camera2.setParameters(parameters);           camera2.startPreview();           camera2.cancelAutoFocus();// 2如果要实现连续的自动对焦，这一句必须加上           camera.cancelAutoFocus();// 只有加上了这一句，才会自动对焦。         }       }     });     }     @Override   public void surfaceDestroyed(SurfaceHolder holder) {     }     // 控制图像的正确显示方向   private void setDispaly(Camera.Parameters parameters, Camera camera) {     if (Integer.parseInt(Build.VERSION.SDK) >= 8) {       setDisplayOrientation(camera, 90);     } else {       parameters.setRotation(90);     }     }     // 实现的图像的正确显示   private void setDisplayOrientation(Camera camera, int i) {     Method downPolymorphic;     try {       downPolymorphic = camera.getClass().getMethod("setDisplayOrientation", new Class[]{int.class});       if (downPolymorphic != null) {         downPolymorphic.invoke(camera, new Object[]{i});       }     } catch (Exception e) {       Log.e("Came_e", "图像出错");     }   } } }

可能出现的问题：

1、没有权限，需要手动打开，代码里由于追求简便，没有主动申请，只在mainfest中注册了