Question

我在界面上显示输出时遇到了麻烦。

我的程序应该能够在输入一些参数时显示相应的输出。如果没有输入参数，则应显示“无结果”，这是我实施的。

但是，即使输入了参数。根据给定的公式，它仍然显示“无结果”而不是答案。

我的代码如下：

public class FreeSpaceActivity extends Fragment implements OnClickListener {

    DecimalFormat disp_W = new DecimalFormat("0.000E0");
    DecimalFormat disp_dBm = new DecimalFormat("0.000");

    EditText tPowerEdit = null;
    EditText tGainEdit = null;
    EditText rGainEdit = null;
    EditText freqEdit = null;
    EditText distanceEdit = null;
    EditText lightEdit = null;
    Button calButton = null;
    Button graphButton = null;
    Button clearButton = null;
    Button plotButton = null;

    EditText radEdit = null;//testing

    private ScrollView llLayout;
    private FragmentActivity faActivity;
    //private Switch switch1;
    // Changes here
    private double mResult = 0;
    private Switch mSelectUnit;
    private TextView mTextFreeSpaces;
    private boolean mIsCalculated;// flag to show the result only when you click on calculate button
    private boolean flag;


    //@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        super.onCreate(null);

        faActivity = (FragmentActivity) this.getActivity();
        llLayout = (ScrollView) inflater.inflate(R.layout.activity_free_space, container, false);

        tPowerEdit = (EditText)llLayout.findViewById(R.id.editText1);
        tGainEdit = (EditText)llLayout.findViewById(R.id.editText2);
        rGainEdit = (EditText)llLayout.findViewById(R.id.editText3);
        freqEdit = (EditText)llLayout.findViewById(R.id.editText4);
        distanceEdit = (EditText)llLayout.findViewById(R.id.editText7);
        lightEdit = (EditText)llLayout.findViewById(R.id.editText8);
        calButton = (Button)llLayout.findViewById(R.id.button1);
        calButton.setOnClickListener(this);
        graphButton = (Button)llLayout.findViewById(R.id.button2);
        graphButton.setOnClickListener(this);
        clearButton = (Button)llLayout.findViewById(R.id.button3);
        clearButton.setOnClickListener(this);
        plotButton =(Button)llLayout.findViewById(R.id.plot_button);
        plotButton.setOnClickListener(this);

        radEdit = (EditText)llLayout.findViewById(R.id.editText28);//testing

        // Changes here
        mTextFreeSpaces = (TextView) llLayout.findViewById(R.id.textFreeSpaces);

        mSelectUnit =(Switch)llLayout.findViewById(R.id.switch1);
        mSelectUnit.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                updateFreeSpacesText(isChecked);
            }
        });
        return llLayout;
    }

    /*private ActionBar getSupportActionBar() {
        return null;
    }*/

    private void updateFreeSpacesText(boolean isSwitcherChecked) {
        if(mIsCalculated && flag==true){
            if(isSwitcherChecked){
                double dBm=10 * Math.log10(mResult* 1000);
                mTextFreeSpaces.setText(disp_dBm.format(dBm));//display dbm
                Toast.makeText(getActivity().getApplicationContext(),"Unit Chosen is dBm", Toast.LENGTH_LONG).show();
            } else {
                double W=mResult;
                mTextFreeSpaces.setText(disp_W.format(W));//display W
                Toast.makeText(getActivity().getApplicationContext(),"Unit Chosen is W", Toast.LENGTH_LONG).show();

            }
        }

    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        super.onCreateOptionsMenu(menu, inflater);
    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        String tPowerStr = tPowerEdit.getText().toString();
        String tGainStr = tGainEdit.getText().toString();
        String rGainStr = rGainEdit.getText().toString();
        String freqStr = freqEdit.getText().toString();
        String distanceStr = distanceEdit.getText().toString();
        String lightStr = lightEdit.getText().toString();
        double tPower = Double.parseDouble(!tPowerStr.isEmpty() ? tPowerStr : "0");
        double tGain = Double.parseDouble(!tGainStr.isEmpty() ? tGainStr : "0");
        double rGain = Double.parseDouble(!rGainStr.isEmpty() ? rGainStr : "0");
        double freq = Double.parseDouble(!freqStr.isEmpty() ? freqStr : "0");
        double distance = Double.parseDouble(!distanceStr.isEmpty() ? distanceStr : "1");
        double light = Double.parseDouble(!lightStr.isEmpty() ? lightStr : "1");

        String radStr = radEdit.getText().toString();//testing
        double radius = Double.parseDouble(!radStr.isEmpty() ? radStr : "0");//testing


        if (v == calButton) {
            if(mResult!=0) {
                double lamda = 300000000 / freq;

                mResult = tPower * tGain * rGain * Math.pow(lamda / (4 * Math.PI * distance), 2) / light / 100;
                mIsCalculated = true;
                flag = true;
                updateFreeSpacesText(mSelectUnit.isChecked());
            }
            else
                mTextFreeSpaces.setText("No results");


        }
        else if (v == graphButton) {

            Intent intent = new Intent(getActivity(), GraphActivity.class);
            intent.putExtra("model", "freeSpace");
            intent.putExtra("tp", tPower);
            intent.putExtra("tg", tGain);
            intent.putExtra("rg", rGain);
            intent.putExtra("f", freq);
            intent.putExtra("l", light);
            this.startActivity(intent);
        } else if (v == clearButton) {
            flag=false;
            double lamda = 300000000 / freq;

            ((EditText) llLayout.findViewById(R.id.editText1)).setText(null);
            ((EditText) llLayout.findViewById(R.id.editText2)).setText(null);
            ((EditText) llLayout.findViewById(R.id.editText3)).setText(null);
            ((EditText) llLayout.findViewById(R.id.editText4)).setText(null);
            ((EditText) llLayout.findViewById(R.id.editText7)).setText(null);
            ((EditText) llLayout.findViewById(R.id.editText8)).setText(null);
            ((EditText) llLayout.findViewById(R.id.editText28)).setText(null);
            ((TextView) llLayout.findViewById(R.id.textFreeSpaces)).setText(null);
            //((TextView) llLayout.findViewById(R.id.textFreeSpacePrd)).setText("");
            //mIsCalculated = true;
            //updateFreeSpacesText(mSelectUnit.isChecked());
            //mResult=tPower * tGain * rGain * Math.pow(lamda / (4 * Math.PI * distance), 2) / light / 100;
            //mTextFreeSpaces.setText("");


        } else if (v == plotButton) {
            //double radius = Double.parseDouble(radius.getText().toString());
            Intent intent = new Intent(getActivity(), MapActivity.class);
            Bundle b = new Bundle();
            //b.putDouble("radius", result);
            intent.putExtras(b);
            this.startActivity(intent);
        }
    }
}

我的界面：

Answer 1

我认为Stultuske是正确的，但我的声望很低，无法评论。

我希望你改变IF-Clause的陈述

        if (v == calButton) {
        if(mResult!=0) {
            .
            .
            .
        }
        else
            mTextFreeSpaces.setText("No results");

除此之外，您每次都会在else分支中运行，因为您的变量mResult仍为0并且没有更改。

如果Edittexts不像

那样是空的，也许你可以撤退

            if(tPowerStr.matches("") && The other Edittexts) {
                .
                .
                .
            }
            else
                mTextFreeSpaces.setText("No results");

编辑：顺便说一句，我对您的应用程序感兴趣，因为我是定向无线电和卫星通信工程师。

无法显示所需的输出

1 个答案: