实现Android手机摄像头的自动对焦，android自动对焦,如何实现Android相

实现Android手机摄像头的自动对焦，android自动对焦,如何实现Android相

如何实现Android相机的自动对焦，而且是连续自动对焦的。当然直接调用系统相机就不用说了，那个很简单的。下面我们主要来看看如如何自己实现一个相机，并且实现自动连续对焦。 代码如下：

public class MainActivity extends Activity { private SurfaceView surfaceView; private SurfaceHolder surfaceHolder; private boolean flag = false; private String fileUrl=""; Camera camera; Camera.Parameters parameters; @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);      setContentView(R.layout.activity_main);      surfaceView =  (SurfaceView) findViewById(R.id.surfaceView1);      Button  button=(Button) findViewById(R.id.takepicture);      surfaceHolder =  surfaceView.getHolder();      surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);      surfaceHolder.setKeepScreenOn(true);      surfaceView.setFocusable(true);      surfaceView.setBackgroundColor(TRIM_MEMORY_BACKGROUND);      surfaceHolder.addCallback(new Callback() {      @Override  public void surfaceDestroyed(SurfaceHolder holder) {   // TODO Auto-generated method stub    camera.stopPreview();    camera.release();    camera=null;  }  @Override  public void surfaceCreated(SurfaceHolder holder) {   // TODO Auto-generated method stub   if(null==camera){      camera=Camera.open();            try {          camera.setPreviewDisplay(surfaceHolder);          initCamera();                  camera.startPreview();    } catch (IOException e) {     // TODO Auto-generated catch block     e.printStackTrace();    }          }  }        @Override  public void surfaceChanged(SurfaceHolder holder, int format, int width, int height){         //实现自动对焦            camera.autoFocus(new 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。                 }                }   });        } });  }  //相机参数的初始化设置      private void initCamera()  {        parameters=camera.getParameters();        parameters.setPictureFormat(PixelFormat.JPEG);        //parameters.setPictureSize(surfaceView.getWidth(), surfaceView.getHeight());  // 部分定制手机，无法正常识别该方法。   parameters.setFlashMode(Parameters.FLASH_MODE_TORCH);    parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);//1连续对焦   setDispaly(parameters,camera);   camera.setParameters(parameters);   camera.startPreview();   camera.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");   }      }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }}