55

我想在相机静止后立即自动对焦 Android 相机。我正在寻找教程或示例如何做到这一点，或者至少是小示例，以显示我可以使用哪些类来挂钩此类事件。

4

6 回答 6

123

对我来说，这是一种享受：

//set camera to continually auto-focus
Camera.Parameters params = c.getParameters();
//*EDIT*//params.setFocusMode("continuous-picture");
//It is better to use defined constraints as opposed to String, thanks to AbdelHady
params.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
c.setParameters(params);
于 2014-04-24T11:25:20.497 回答
63

尝试使用Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO或Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE。见下文：

Camera.Parameters params = camera.getParameters();
if (params.getSupportedFocusModes().contains(
    Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO)) {
  params.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO);
}
camera.setParameters(params);

在尝试使用之前测试手机是否支持您选择的模式很重要，否则setParameters()会引发运行时异常。（编辑代码现在可以正常工作）

于 2015-02-08T01:03:47.290 回答
19

以下代码对我有用。

设置自动对焦（预览类）：

Parameters params = camera.getParameters();
params.setFocusMode(Parameters.FOCUS_MODE_AUTO);
//some more settings
camera.setParameters(params);

如果自动对焦准备好（活动类），请调用相机拍摄照片：

public void butClick(View v){
    preview.camera.autoFocus(new AutoFocusCallback() {
        public void onAutoFocus(boolean success, Camera camera) {
            if(success){
                camera.takePicture(shutterCallback, rawCallback, jpegCallback);
            }
        }
    });
}

获取图片（活动课）：

PictureCallback jpegCallback = new PictureCallback() {
    public void onPictureTaken(byte[] data, Camera camera) {
        //do something
    }
};
于 2014-11-30T18:45:14.230 回答
7

看起来你应该像这里讨论的那样连续自动对焦。

这里有个问题可以参考。

于 2013-03-25T21:01:04.963 回答
1

这非常适合预览回调：

Camera.Parameters parameters = camera.getParameters();
if (parameters.getSupportedFocusModes().contains(
        Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO)) {
    parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO);
}
camera.setParameters(parameters);
于 2017-07-06T11:26:47.400 回答
0

你可以试试代码：

ShutterCallback _pfnShutterCallback = new ShutterCallback() {

        @Override
        public void onShutter() {
            // TODO Auto-generated method stub

        }

    };

    PictureCallback _pfnRawPictureCallback = new PictureCallback() {

        @Override
        public void onPictureTaken(byte[] data, Camera camera) {
            // TODO Auto-generated method stub

        }
    };

    private AutoFocusCallback _pfnAutoFocusCallback = new AutoFocusCallback() {

        @Override
        public void onAutoFocus(boolean success, Camera camera) {
            // TODO Auto-generated method stub
            camera.autoFocus(null);
            camera.takePicture(_pfnShutterCallback, _pfnRawPictureCallback,
                    mPicture);

        }
    };
    private PictureCallback mPicture = new PictureCallback() {

        public void onPictureTaken(byte[] data, Camera camera) {
            new SavePhotoTask().execute(data);
            camera.startPreview();

        }
    };
class SavePhotoTask extends AsyncTask<byte[], String, String> {
// Process save file image
}

通话捕捉：mCamera.autoFocus(autoFocusCallback);

您可以参考： http ://android-er.blogspot.com/2011/01/start-camera-auto-focusing-autofocus.html

于 2014-06-02T11:03:57.387 回答