Android实现手机摄像头的自动对焦
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:
publicclassMainActivityextendsActivity{ privateSurfaceViewsurfaceView; privateSurfaceHoldersurfaceHolder; privatebooleanflag=false; privateStringfileUrl=""; Cameracamera; Camera.Parametersparameters; @Override protectedvoidonCreate(BundlesavedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); surfaceView=(SurfaceView)findViewById(R.id.surfaceView1); Buttonbutton=(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(newCallback(){ @Override publicvoidsurfaceDestroyed(SurfaceHolderholder){ //TODOAuto-generatedmethodstub camera.stopPreview(); camera.release(); camera=null; } @Override publicvoidsurfaceCreated(SurfaceHolderholder){ //TODOAuto-generatedmethodstub if(null==camera){ camera=Camera.open(); try{ camera.setPreviewDisplay(surfaceHolder); initCamera(); camera.startPreview(); }catch(IOExceptione){ //TODOAuto-generatedcatchblock e.printStackTrace(); } } } @Override publicvoidsurfaceChanged(SurfaceHolderholder,intformat,intwidth,intheight){ //实现自动对焦 camera.autoFocus(newAutoFocusCallback(){ @Override publicvoidonAutoFocus(booleansuccess,Cameracamera){ 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 privatevoidinitCamera() { 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 privatevoidsetDispaly(Camera.Parametersparameters,Cameracamera) { if(Integer.parseInt(Build.VERSION.SDK)>=8){ setDisplayOrientation(camera,90); } else{ parameters.setRotation(90); } } //实现的图像的正确显示 privatevoidsetDisplayOrientation(Cameracamera,inti){ MethoddownPolymorphic; try{ downPolymorphic=camera.getClass().getMethod("setDisplayOrientation",newClass[]{int.class}); if(downPolymorphic!=null){ downPolymorphic.invoke(camera,newObject[]{i}); } } catch(Exceptione){ Log.e("Came_e","图像出错"); } } @Override publicbooleanonCreateOptionsMenu(Menumenu){ //Inflatethemenu;thisaddsitemstotheactionbarifitispresent. getMenuInflater().inflate(R.menu.main,menu); returntrue; } }
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