나는 몇 가지 코드를 통합하려고하고 내가 가지고있는 라인 중 하나입니다 : 내가 활동에있을 때활동 및 단편에 대한 컨텍스트의 차이점은 무엇입니까?
mPreview = new CameraPreview(this, mCamera, previewCb, autoFocusCB);
는 오류가 없다. 내 조각에 넣을 때, 나는이 오류가 : 은 예상 : android.content.context 는 실제이 (com.xxx.ScanFragment)
이 나는 것처럼 CameraPreview 방법
public CameraPreview(Context context, Camera camera,
PreviewCallback previewCb,
AutoFocusCallback autoFocusCb)
입니다 이 파일이 활동 파일에있을 때 오류가 발생하지 않으므로 활동과 조각 사이의 "컨텍스트"가 어떤 차이가 있는지 가정합니다.
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.hardware.Camera;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.TextView;
import com.parse.ParseUser;
import net.sourceforge.zbar.Config;
import net.sourceforge.zbar.Image;
import net.sourceforge.zbar.ImageScanner;
import net.sourceforge.zbar.Symbol;
import net.sourceforge.zbar.SymbolSet;
/**
* Created by Jakub on 7/23/2014.
*/
public class Pay extends Fragment {
private Button scanBtn;
private TextView formatTxt, contentTxt;
private Camera mCamera;
private CameraPreview mPreview;
private Handler autoFocusHandler;
TextView scanText;
Button scanButton;
ImageScanner scanner;
private boolean barcodeScanned = false;
private boolean previewing = true;
static {
System.loadLibrary("iconv");
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_pay, container, false);
return rootView;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
autoFocusHandler = new Handler();
mCamera = getCameraInstance();
/* Instance barcode scanner */
scanner = new ImageScanner();
scanner.setConfig(0, Config.X_DENSITY, 3);
scanner.setConfig(0, Config.Y_DENSITY, 3);
mPreview = new CameraPreview(getActivity(), mCamera, previewCb, autoFocusCB);
FrameLayout preview = (FrameLayout)getActivity().findViewById(R.id.cameraPreview);
Log.d(Payspot.TAG,"This is the string:" + preview.toString());
preview.addView(mPreview);
scanText = (TextView)getActivity().findViewById(R.id.scanText);
scanButton = (Button)getActivity().findViewById(R.id.ScanButton);
scanButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (barcodeScanned) {
barcodeScanned = false;
scanText.setText("Scanning...");
mCamera.setPreviewCallback(previewCb);
mCamera.startPreview();
previewing = true;
mCamera.autoFocus(autoFocusCB);
}
}
});
}
public void onPause() {
super.onPause();
releaseCamera();
}
/** A safe way to get an instance of the Camera object. */
public static Camera getCameraInstance(){
Camera c = null;
try {
c = Camera.open();
} catch (Exception e){
}
return c;
}
private void releaseCamera() {
if (mCamera != null) {
previewing = false;
mCamera.setPreviewCallback(null);
mCamera.release();
mCamera = null;
}
}
private Runnable doAutoFocus = new Runnable() {
public void run() {
if (previewing)
mCamera.autoFocus(autoFocusCB);
}
};
Camera.PreviewCallback previewCb = new Camera.PreviewCallback() {
public void onPreviewFrame(byte[] data, Camera camera) {
Camera.Parameters parameters = camera.getParameters();
Camera.Size size = parameters.getPreviewSize();
Image barcode = new Image(size.width, size.height, "Y800");
barcode.setData(data);
int result = scanner.scanImage(barcode);
if (result != 0) {
previewing = false;
mCamera.setPreviewCallback(null);
mCamera.stopPreview();
SymbolSet syms = scanner.getResults();
for (Symbol sym : syms) {
scanText.setText("barcode result " + sym.getData());
barcodeScanned = true;
}
}
}
};
// Mimic continuous auto-focusing
Camera.AutoFocusCallback autoFocusCB = new Camera.AutoFocusCallback() {
public void onAutoFocus(boolean success, Camera camera) {
autoFocusHandler.postDelayed(doAutoFocus, 1000);
}
};
}
당신은 당신의 조각에서 활동 컨텍스트를 전달하려고 했습니까? 귀하의 조각에 getActivity() 메서드를 사용하여? –
그래서 getActivity()로 바꿀까요? 아니면 정확히 어디에서 부를까요? 나는 이것을 getActivity()로 바꿨고 nullPointerException을 얻고있다. – user3794585