我正在尝试创建自己的相机视图,除了自动对焦之外我还能正常工作,我似乎无法弄清楚为什么它不起作用.这是我的CameraView.
java代码
public class CameraView extends SurfaceView implements SurfaceHolder.Callback {
private SurfaceHolder surface_Holder;
private Camera main_Camera;
boolean on;
public CameraView(Context context,Camera camera){
super(context);
main_Camera = camera;
main_Camera.setDisplayOrientation(90);
surface_Holder = getHolder();
surface_Holder.addCallback(this);
surface_Holder.setType(SurfaceHolder.SURFACE_TYPE_NORMAL);
}
public boolean isOn(){
return on;
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
try{
main_Camera.setPreviewDisplay(holder);
main_Camera.startPreview();
}catch (Exception e){
Log.d("Error","Canmera error on surfaceCreated" + e.getMessage());
main_Camera.release();
main_Camera = null;
}
}
@Override
public void surfaceChanged(SurfaceHolder holder,int format,int width,int height) {
if(holder.getSurface()==null){
return;
}
try{
main_Camera.stopPreview();
}catch (Exception e){
}
try{
main_Camera.setPreviewDisplay(surface_Holder);
main_Camera.startPreview();
}catch (IOException e){
Log.d("Error","Camera error on surfaceChanged " + e.getMessage());
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
main_Camera.setPreviewCallback(null);
main_Camera.stopPreview();
main_Camera.release();
main_Camera= null;
}
}
在我的清单中,我有以下内容：
<uses-permission android:name="android.permission.CAMERA" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-feature android:name="android.hardware.camera" /> <uses-feature android:name="android.hardware.camera.autofocus" />
解决方法
如果你添加< uses-feature android：name =“android.hardware.camera.autofocus”/>你的清单并不意味着相机会进行自动对焦.这意味着您允许您的应用程序使用相机硬件或处理自动对焦的软件.
The purpose of a declaration is to inform any external entity of the set of hardware and software features on which your application depends.
要将相机设置为焦点,可以将此方法添加到CameraView类：
private void setFocus(String mParameter) {
Camera.Parameters mParameters = mCamera.getParameters();
mParameters.setFocusMode(mParameter);
mCamera.setParameters(mParameters);
}
然后在surfaceChanged()中调用此方法,如下所示：
public void surfaceChanged(SurfaceHolder holder,int w,int h) {
...//your code here
// Set focus mode to continuous picture
setFocus(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
// Start camera preview
mCamera.startPreview();
}
您可以选择以下焦点参数：
String FOCUS_MODE_AUTO Auto-focus mode.
String FOCUS_MODE_CONTINUOUS_PICTURE Continuous auto focus mode
intended for taking pictures.String FOCUS_MODE_CONTINUOUS_VIDEO Continuous auto focus mode intended
for video recording.String FOCUS_MODE_EDOF Extended depth of field (EDOF).
String FOCUS_MODE_FIXED Focus is fixed.
String FOCUS_MODE_INFINITY Focus is set at infinity.
String FOCUS_MODE_MACRO Macro (close-up) focus mode.
