Я пытаюсь получить считыватель штрих-кода во фрагменте, но получаю ошибку. Кто-нибудь имеет представление о проблеме? Я новичок в фрагментах и не знаю, что я делаю неправильно. Пожалуйста помоги..
Логкат:
08-02 09:48:22.890: E/AndroidRuntime(11718): FATAL EXCEPTION: main
08-02 09:48:22.890: E/AndroidRuntime(11718): java.lang.NullPointerException
08-02 09:48:22.890: E/AndroidRuntime(11718): at com.learn2crack.tab.Android$2.onPreviewFrame(Android.java:106)
08-02 09:48:22.890: E/AndroidRuntime(11718): at android.hardware.Camera$EventHandler.handleMessage(Camera.java:864)
08-02 09:48:22.890: E/AndroidRuntime(11718): at android.os.Handler.dispatchMessage(Handler.java:99)
08-02 09:48:22.890: E/AndroidRuntime(11718): at android.os.Looper.loop(Looper.java:176)
08-02 09:48:22.890: E/AndroidRuntime(11718): at android.app.ActivityThread.main(ActivityThread.java:5365)
08-02 09:48:22.890: E/AndroidRuntime(11718): at java.lang.reflect.Method.invokeNative(Native Method)
08-02 09:48:22.890: E/AndroidRuntime(11718): at java.lang.reflect.Method.invoke(Method.java:511)
08-02 09:48:22.890: E/AndroidRuntime(11718): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
08-02 09:48:22.890: E/AndroidRuntime(11718): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
08-02 09:48:22.890: E/AndroidRuntime(11718): at dalvik.system.NativeStart.main(Native Method)
и код:
public class Android extends Fragment {
public Android(){}
private Camera mCamera;
private CameraPreview mPreview;
private Handler autoFocusHandler;
private static final String TAG_PID = "pid";
TextView scanText;
ImageScanner scanner;
private boolean barcodeScanned = false;
private boolean previewing = true;
FrameLayout preview;
static {
System.loadLibrary("iconv");
}
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View android = inflater.inflate(R.layout.android_frag, container, false);
autoFocusHandler = new Handler();
mCamera = getCameraInstance();
mPreview = new CameraPreview(this.getActivity(), mCamera, previewCb, autoFocusCB);
preview = (FrameLayout) android.findViewById(R.id.cameraPreview);
preview.addView(mPreview);
scanText = (TextView) android.findViewById(R.id.scanText);
return android;
}
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);
}
};
PreviewCallback previewCb = new PreviewCallback() {
public void onPreviewFrame(byte[] data, Camera camera) {
Camera.Parameters parameters = camera.getParameters();
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
AutoFocusCallback autoFocusCB = new AutoFocusCallback() {
public void onAutoFocus(boolean success, Camera camera) {
autoFocusHandler.postDelayed(doAutoFocus, 1000);
}
};
}