我想尽快自动对焦摄像头的Android照相机持有不动。 林寻找教程或样本如何做到这一点，或至少小样本，显示我可以用什么类勾上此类事件。
Answer 1:
对于我这种工作一种享受：
//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);
Answer 2:
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);
它来测试手机是否试图使用它之前，支持你所选择的模式是很重要的，否则setParameters()将抛出一个运行时异常。 （编辑代码现在能正常使用）
Answer 3:
下面的代码为我工作。
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);
通话摄像头在拍摄的情况下的图片即自动对焦就绪（活动类）：
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（活动类）：
PictureCallback jpegCallback = new PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
//do something
}
};
Answer 4:
看起来你应该连续自动对焦如这里讨论。
有一个在这里的问题 ，你可以参考一下。
Answer 5:
这完全适用预览回调：
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);
Answer 6:
你可以尝试代码：
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
}
呼叫捕捉： mCamera.autoFocus(autoFocusCallback);
你可以参考在： http://android-er.blogspot.com/2011/01/start-camera-auto-focusing-autofocus.html
文章来源: How to autofocus Android camera automatically?
