Question

我有一个ViewPager活动，viewPager上的每个Fragment打开一个DailogFragment，我可以在其中插入一个对象，当我点击Accept按钮时，DialogFragmnent解除，而父Fragment必须将信息添加到Layout。我使用接口与片段进行通信，但我无法更新片段上的布局。我尝试了一些没有好结果的解决方案。代码如下：

public class DialogFragmentProducts extends DialogFragment {

    View view;

        Picking picking;

    PackOperation pack, packOp;
    Holder holder;
    byte index;
    private static final int ZBAR_SCANNER_REQUEST = 0;

    private Fragment fragment;

    public DialogFragmentProducts(){

    }

    public static DialogFragmentProducts newInstance(String title, Long id, Long idProd) {
        DialogFragmentProducts frag = new DialogFragmentProducts();
        Bundle args = new Bundle();
        args.putString("title", title);
        args.putLong("picking", id);
        if (idProd!= null)
            args.putLong("producto", idProd);
        else
            args.putLong("producto", -1);
        frag.setArguments(args);
        return frag;
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        super.onCreateDialog(savedInstanceState);
        fragment = getTargetFragment();
        String title = getArguments().getString("title");
        picking = Model.load(Picking.class, getArguments().getLong("picking"));
        Long test = getArguments().getLong("producto");
        if (getArguments().getLong("producto")!=-1) {
            packOp = ListService.getPackOperationbyProduct(String.valueOf(getArguments().getLong("producto"))).get(0);

        }
        LayoutInflater inflater = getActivity().getLayoutInflater();
        view = inflater.inflate(R.layout.dialog_fragment_product, null);

        Inicialize();

        fragment = getTargetFragment();
        return new AlertDialog.Builder(getActivity())
                .setTitle(title)
                .setView(view)
                .setPositiveButton(this.getString(R.string.accept_button),
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog,
                                                int whichButton) {
                                try{
                                    pack.setProductQty(Double.parseDouble((String) qty.getText().toString()));
                                    pack.setPackage(holder.getPackFuente());
                                    pack.setSync(false);

                                    sendBackResult();
                                    ((TransferPickingActivityProduct)getTargetFragment()).onResume();
                                }
                                catch (Exception e){
                                    Toast.makeText(getContext(), getResources().getString(R.string.data_entry), Toast.LENGTH_LONG).show();
                                }

                            }
                        })
                .setNegativeButton(this.getString(R.string.cancel_button),
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog,
                                                int whichButton) {
                                ((TransferPickingActivityProduct)getTargetFragment())
                                        .doNegativeClick();
                                dismiss();
                            }
                        } ).create();

    }

    public interface DFragmentListener {
        void onFinishEditDialog(PackOperation packOperation);
    }

    public void sendBackResult() {

        DFragmentListener listener = (DFragmentListener) getTargetFragment();

        listener.onFinishEditDialog(pack);

        dismiss();
    }

    public void launchScanner(View view) {
        try {
            if (isCameraAvailable()) {

                Intent intent = new Intent(DialogFragmentProducts.this.getContext(), ZBarScannerActivity.class);
                startActivityForResult(intent, ZBAR_SCANNER_REQUEST);


                (intent.getStringExtra(ZBarConstants.SCAN_RESULT).equals(null));
                } else {
                Toast.makeText(this.getContext(), this.getString(R.string.available_camera), Toast.LENGTH_SHORT).show();
            }
        } catch (Exception e){
            Toast.makeText(this.getContext(), this.getString(R.string.read_barcode_error), Toast.LENGTH_SHORT).show();
        }
    }

    public boolean isCameraAvailable() {
        PackageManager pm = DialogFragmentProducts.this.getActivity().getPackageManager();
        return pm.hasSystemFeature(PackageManager.FEATURE_CAMERA);
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
            case ZBAR_SCANNER_REQUEST:

                if (resultCode == getActivity().RESULT_OK) {

                    String ean13 = data.getStringExtra(ZBarConstants.SCAN_RESULT);
                    Fragment f = getTargetFragment();
                }
                break;
        }
    }

    @Override
    public void onSaveInstanceState(final Bundle outState){
        this.setTargetFragment(this, -1);
    }

    @Override
    public void onDismiss(final DialogInterface dialog) {
        super.onDismiss(dialog);
        setTargetFragment(getTargetFragment(), 1);
        Fragment parentFragment = getTargetFragment();
        if (parentFragment instanceof DialogInterface.OnDismissListener) {
            ((DialogInterface.OnDismissListener) parentFragment).onDismiss(dialog);
        }
    }

}

和DialogFragmentProduct：

{{1}}

Answer 1

首先，你应该检查你是否真的从父片段的对话框中获取数据简单方法Log.d（“我的调试”，......）

如果没有看到下面的例子

从片段

调用对话框

    DialogFragment fragment = new DialogFragment ;
    fragment.setArguments(args);
    fragment.setTargetFragment(this, REQ_FLAG);
    fragment.show(getFragmentManager(), fragment.getClass().getName());

在关闭对话框片段

后获取回调和数据

 @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (resultCode == Activity.RESULT_OK) {
                .....

        } else if (resultCode == Activity.RESULT_CANCELED){
                .....
             String string = data.getStringExtra("string");
    }

在对话框片段

中

builder.setView(view).setNegativeButton(R.string.btnDel,
                new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Intent intent = new Intent();
                        intent.putExtra("string", " Hi ");
                        getTargetFragment().onActivityResult(getTargetRequestCode(),
                                Activity.RESULT_CANCELED, intent);
                    }
                });

之后您应该记住ViewPager在开始时创建所有片段，您应该手动刷新片段元素

无法在dialogframent dismiss上更新片段

1 个答案: