Android调用前后摄像头同时工作实例代码

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

<?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>

public class MainActivity extends AppCompatActivity {SurfaceView surfaceview1, surfaceview2;SurfaceHolder surfaceholder1, surfaceholder2;String TAG = "MainActivity";private Camera camera1 = null, camera2;Camera.Parameters parameters;@Overrideprotected 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());}@Overrideprotected 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");    }  }}}