嗨，我是 Android 新手，在我的应用程序中，我使用 Z-bar 库来扫描条形码。
为此，我使用如下所示的 ZbarScannerActivity 类，因此在扫描条形码后，我可以使用 onActivityResult 方法在任何我想要的地方获得这些条形码结果。
这里我的问题是，当我扫描条形码时，我想在我的 fragment 中得到这个结果，但是这里的 onActivityResult 没有在我的 fragment 中调用。 但它正在调用我的 Activity ，请帮助我。
如何解决这个问题？
ZbarScanner Activity :-
public class ZBarScannerActivity extends ActionBarActivity {
private Camera mCamera;
private CameraPreview mPreview;
private Handler autoFocusHandler;
ImageScanner scanner;
ImageView backButton;
private boolean barcodeScanned = false;
private boolean previewing = true;
CustomTextview navigation_title;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_scanner_view_layout);
ActionBar actionBar = getSupportActionBar();
String header = "<font color=\"#ffffff\">" + "BarCode Scanner"
+ " </font>";
CommonUtils.actionbarHeader(this, actionBar, header);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
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(this, mCamera, previewCb, autoFocusCB);
FrameLayout preview = (FrameLayout) findViewById(R.id.cameraPreview);
preview.addView(mPreview);
navigation_title = (CustomTextview)findViewById(R.id.navigationTitle_id);
navigation_title.setText("Barcode Scanner");
backButton = (ImageView)findViewById(R.id.navigationbackbutton_id);
backButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});
}
static {
System.loadLibrary("iconv");
}
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) {
System.out.println("------->"+sym.getData());
barcodeScanned = true;
finishActivivtyWithResult(sym.getData());
}
}
}
};
// Mimic continuous auto-focusing
AutoFocusCallback autoFocusCB = new AutoFocusCallback() {
public void onAutoFocus(boolean success, Camera camera) {
autoFocusHandler.postDelayed(doAutoFocus, 1000);
}
};
/**
*
* @param barCodeResult
*/
private void finishActivivtyWithResult(String barCodeResult){
if (barCodeResult.contains("//b")) {
String replacedString = barCodeResult.replace("//b", "");
System.out.println("One========>" + replacedString);
barCodeResult = replacedString;
}
if (barCodeResult.contains("/t")) {
String replacedString = barCodeResult.replace("/t", "-");
System.out.println("After========>" + replacedString);
barCodeResult = replacedString;
}
Bundle conData = new Bundle();
conData.putString("barCodeResult", barCodeResult);
Intent intent = new Intent();
intent.putExtras(conData);
setResult(RESULT_OK, intent);
finish();
}
@Override
public boolean onSupportNavigateUp() {
finish();
return true;
}
}
我的 fragment :-
//Camera Button Action Event:-
/**
* @return
*/
private View.OnClickListener cameraDetails() {
return new View.OnClickListener() {
@Override
public void onClick(View v) {
BAR_CODE_SCANNER_CODE = 100;
checkCameraPermission();
}
};
}
//BarCode Scanner Result:-
private void checkCameraPermission() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
checkManifestPermissionSets();
} else {
scanProductCode();
}
}
@TargetApi(23)
private void checkManifestPermissionSets() {
int cameraPermission = ContextCompat.checkSelfPermission(getActivity(),
Manifest.permission.CAMERA);
List<String> permissions = new ArrayList<String>();
if (cameraPermission != PackageManager.PERMISSION_GRANTED) {
permissions.add(Manifest.permission.CAMERA);
}
if (!permissions.isEmpty()) {
requestPermissions(
permissions.toArray(new String[permissions.size()]),
REQUEST_CODE_SOME_FEATURES_PERMISSIONS);
} else {
scanProductCode();
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
switch (requestCode) {
case REQUEST_CODE_SOME_FEATURES_PERMISSIONS: {
for (int i = 0; i < permissions.length; i++) {
if (grantResults[i] == PackageManager.PERMISSION_GRANTED) {
//Log.d("Permissions", "Permission Granted: "+ permissions[i]);
scanProductCode();
break;
} else if (grantResults[i] == PackageManager.PERMISSION_DENIED) {
//Log.d("Permissions", "Permission Denied: " + permissions[i]);
//CommonUtils.showToastMessage(StockTransfer.this, "You've disabled the App required Permissions");
break;
}
}
}
break;
default: {
super.onRequestPermissionsResult(requestCode, permissions,
grantResults);
}
}
}
private void scanProductCode() {
if (isCameraAvailable()) {
CommonUtils.showToastMessage(getActivity(),
"Please Scan Your Product BarCode");
callThreadScannerActivity();
} else {
Toast.makeText(getActivity(), "Rear Facing Camera Unavailable",
Toast.LENGTH_SHORT).show();
}
}
private void callThreadScannerActivity() {
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
// dialog.dismiss();
callScannerActivity();
}
}, 700);
}
// Call Scanner Activity:-
private void callScannerActivity() {
Intent intent = new Intent(getActivity(), ZBarScannerActivity.class);
startActivityForResult(intent, BAR_CODE_SCANNER_CODE);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
System.out.println("result code------>" + requestCode);
}
private boolean isCameraAvailable() {
PackageManager pm = getActivity().getPackageManager();
return pm.hasSystemFeature(PackageManager.FEATURE_CAMERA);
}
}
最佳答案
与日常生活相关的简单逻辑
activity : father(parent)
fragment : child
如果 child 想要钱，就向他/她的父亲要钱。
如果 fragment (子)想要从 onActivityResult 获取数据，技术方法它总是通过 Activity(父亲)。
ohk ..让我们看看代码方面
东西在
yourActivity (Parent)
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
try {
List<Fragment> fragments = getSupportFragmentManager().getFragments();
if (fragments != null) {
for (Fragment fragment : fragments) {
fragment.onActivityResult(requestCode, resultCode, data);
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
此 Activity fragment (子)列表向他的 Activity (父亲)表示数据
当 Activity 收到数据时，它会按照 fragment (子级)的要求提供。
关于android - onActivityResult 未在 Fragment 中调用，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38092761/