Question

任何帮助我，我在android studio上都遇到这样的错误：

java.lang.NullPointerException：尝试调用虚拟方法 '布尔com.refresh.pos.domain.sale.kas.addKas1（java.lang.String， double）'在空对象引用上在com.refresh.pos.ui.sale.AddKasDialogFragment $ 1.onClick（AddKasDialogFragment.java:81）在android.view.View.performClick（View.java:5721）在android.widget.TextView.performClick（TextView.java:10936）在android.view.View $ PerformClick.run（View.java:22620）在android.os.Handler.handleCallback（Handler.java:739）在android.os.Handler.dispatchMessage（Handler.java:95）在android.os.Looper.loop（Looper.java:148）在android.app.ActivityThread.main（ActivityThread.java:7406）在java.lang.reflect.Method.invoke（本机方法）在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:1230）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:1120）06-21 19：25：07.641 22109-22109 / com.refresh.pos I / Process：正在发送信号。 PID：22109 SIG：9

此AddKasDialogFragment.java

public class AddKasDialogFragment extends DialogFragment {
    private EditText pengeluaran;
    private kas kas;
    private EditText ketBox;
    private EditText pemasukanBox;
    private Button confirmButton;
    private Button clearButton;
    private UpdatableFragment fragment;
    private Resources res;

    public AddKasDialogFragment(UpdatableFragment fragment) {

        super();
        this.fragment = fragment;
    }
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {


        View v = inflater.inflate(R.layout.layout_addkas, container,
                false);

        res = getResources();

        pengeluaran = (EditText) v.findViewById(R.id.pengeluaranBox);
        ketBox = (EditText) v.findViewById(R.id.ketBox);
        pemasukanBox = (EditText) v.findViewById(R.id.pemasukanBox);
        confirmButton = (Button) v.findViewById(R.id.confirmButton);
        clearButton = (Button) v.findViewById(R.id.clearButton);

        initUI();
        return v;
    }
    private void initUI() {


        confirmButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {

                if (pengeluaran.getText().toString().equals("")
                        || ketBox.getText().toString().equals("")
                        || pemasukanBox.getText().toString().equals("")) {

                    Toast.makeText(getActivity().getBaseContext(),
                            res.getString(R.string.please_input_all), Toast.LENGTH_SHORT)
                            .show();

                } else {
                    if (pemasukanBox.getText().toString() == null) {

                        Toast.makeText(getActivity().getBaseContext(),
                                res.getString(R.string.please_input_all), Toast.LENGTH_SHORT)
                                .show();

                    } else {
                        String KetBox = ketBox.getText().toString();
                        boolean success1 = kas.addKas1(KetBox, Double.parseDouble(pemasukanBox.getText()
                                .toString()));
                        if (success1) {
                            Toast.makeText(getActivity().getBaseContext(),
                                    res.getString(R.string.success) + ", "
                                            + ketBox.getText().toString(),
                                    Toast.LENGTH_SHORT).show();

                            fragment.update();
                            clearAllBox();
                            AddKasDialogFragment.this.dismiss();

                        } else {
                            Toast.makeText(getActivity().getBaseContext(),
                                    res.getString(R.string.fail),
                                    Toast.LENGTH_SHORT).show();
                        }
                    }

                }
            }
        });

        clearButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(ketBox.getText().toString().equals("") && pengeluaran.getText().toString().equals("") && pemasukanBox.getText().toString().equals("")){
                    AddKasDialogFragment.this.dismiss();
                } else {
                    clearAllBox();
                }
            }
        });
    }
    private void clearAllBox() {
        ketBox.setText("");
        pengeluaran.setText("");
       pemasukanBox.setText("");
    }
}

这个Kas.java

package com.refresh.pos.domain.sale;
import java.util.List;

import com.refresh.pos.techicalservices.kas.KasDao;
public class kas {
    private KasDao kasDao;

    public kas(KasDao kasDao) {
        this.kasDao = kasDao;
    }

    public boolean addKas1(String keterangan, double jumlah) {

        KasDet kasdet = new KasDet(keterangan, jumlah);
        int id = kasDao.addKas(kasdet);
        return id != -1;
    }

}

Answer 1

错误属于kas，尚未初始化

 else {
                    String KetBox = ketBox.getText().toString();
                    kas = new kas(); //change here

                    boolean success1 = kas.addKas1(KetBox, Double.parseDouble(pemasukanBox.getText()
                            .toString()));
                    if (success1) {
                        Toast.makeText(getActivity().getBaseContext(),
                                res.getString(R.string.success) + ", "
                                        + ketBox.getText().toString(),
                                Toast.LENGTH_SHORT).show();

                        fragment.update();
                        clearAllBox();
                        AddKasDialogFragment.this.dismiss();

                    }

Answer 2

阅读您的错误。 kas为空，因为您从未将其初始化。

java.lang.NullPointerException：尝试调用虚拟方法'boolean com.refresh.pos.domain.sale.kas.addKas1（java.lang.String，double）'

2 个答案: