在用户捕获图像后执行操作答案

【问题标题】：Performing an action after user has captured an image在用户捕获图像后执行操作
【发布时间】：2015-06-03 10:53:07
【问题描述】：

我想在用户捕获图像后执行一个动作。但是在我捕获图像后我没有看到任何事情发生。我使用下面的代码和CWAC-Camera library。写在onPictureTaken 中的内容是我想要的动作在用户捕获图像后执行-

public class CameraActivity extends Activity implements Camera.PictureCallback {

private final String TAG_CAMERA_FRAGMENT = "camera_fragment";
private CameraPreview mCameraPreview;
ImageView switchToVideoOpen,camera;
private Boolean isVideoOpen = false;
CircleImageView togglePlay;
RelativeLayout actioncamera;
View blackTransparent;
byte[] datacamera;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.fragment_camera);
    switchToVideoOpen=(ImageView)findViewById(R.id.switchToVideoOpen);
    camera=(ImageView)findViewById(R.id.camera);
    togglePlay = (CircleImageView) findViewById(R.id.togglePlay);
    actioncamera = (RelativeLayout) findViewById(R.id.audio_actions_container);
    blackTransparent = findViewById(R.id.blacktreansparent);

    CameraFragment f = new CameraFragment();
    getFragmentManager().beginTransaction()
            .add(R.id.preview_view, f, TAG_CAMERA_FRAGMENT)
            .commit();

    f.setHost(new SimpleCameraHost(this));

    camera.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            takePicture();
        }
    });
    switchToVideoOpen.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if (!isVideoOpen) {

                isVideoOpen = true;
                switchToVideoOpen.setImageResource(R.drawable.video_stop);
                camera.setImageResource(R.drawable.video_icon);
                setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
                takeVideo();
            }
            else{
                isVideoOpen = false;
                switchToVideoOpen.setImageResource(R.drawable.video_icon);
                camera.setImageResource(R.drawable.video_stop);
                stopVideo();
            }
        }
    });
}
@Override
public void onResume() {
    super.onResume();

}

private void takePicture() {
    CameraFragment f = (CameraFragment) getFragmentManager().findFragmentByTag(TAG_CAMERA_FRAGMENT);
    if (f != null && f.isVisible()) {
        f.takePicture();
    }
}
private void takeVideo() {

    CameraFragment f = (CameraFragment) getFragmentManager().findFragmentByTag(TAG_CAMERA_FRAGMENT);
    if (f != null && f.isVisible()) {
        try {
            f.record();
        } catch (Exception e) {

        }
    }
}
private void stopVideo() {

    CameraFragment f = (CameraFragment) getFragmentManager().findFragmentByTag(TAG_CAMERA_FRAGMENT);
    if (f != null && f.isVisible()) {
        try {
            f.stopRecording();
        } catch (Exception e) {

        }
    }
}

@Override
public void onPictureTaken(byte[] bytes, Camera camera) {
    String pictureFile = GFileUtils.getGCameraDir().getAbsolutePath()+"/"+
            G.getFileNameForGMedia(G.General.MEDIA_TYPE_PHOTO);
    if (pictureFile == null) {

        return;
    }
    blackTransparent.setVisibility(View.VISIBLE);
    actioncamera.setVisibility(View.VISIBLE);
    togglePlay.setVisibility(View.VISIBLE);
    datacamera=bytes;
}

}

【问题讨论】：

标签： android android-camera commonsware-cwac cwac-camera

【解决方案1】：

onPictureTaken() 不会被调用，因为这不是库的工作方式。

文档介绍了如何override photo saving 和从相机接收byte[] 以执行您计划执行的任何操作。它涉及创建自己的CameraHost（无论是从头开始还是通过继承SimpleCameraHost）并覆盖saveImage(PictureTransaction, byte[])。

【讨论】：