我已经使用这个网站搜索了两个学期的特定错误。我知道我要问的问题比我在本网站上搜索/阅读的大多数内容都更广泛和更基本,但这是我在课堂外唯一要寻求信息的地方。

现在,我正在使用Android Studio开发一个简单的Photo Calculator Phone应用程序。它具有3个单选按钮,每个按钮分配了一个特定值。我知道我在引用每个按钮并尝试触发计算时出了点问题。

当前的一些错误:

    Cannot resolve method'getText()'
    Operator '<' cannot be applied to 'android.widget.editText','int'
    Operator "*" cannot be applied to 'double', 'andriod.widget.EditText'


下面是代码:

        package com.example.squirreloverlord.ccarringtonphonephotoprint;

    import android.icu.text.DecimalFormat;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.RadioButton;
    import android.widget.TextView;
    import android.widget.Toast;

    public class MainActivity extends AppCompatActivity {
    double small = 19;
    double medium = 49;
    double large = 79;
    double Result;
    double inputUser;
    double Number;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

    getSupportActionBar().setDisplayShowHomeEnabled(true);
    getSupportActionBar().setLogo(R.mipmap.ic_launcher);
    getSupportActionBar().setDisplayUseLogoEnabled(true);

        final EditText inputUser = (EditText)     findViewById(R.id.editTextNumber);
        final RadioButton radioButton4x6 = (RadioButton)     findViewById(R.id.radioButton4x6);
        final RadioButton radioButton5x7 = (RadioButton) findViewById(R.id.radioButton5x7);
        final RadioButton radioButton8x10  = (RadioButton)findViewById(R.id.radioButton8x10);
        final TextView Result = (TextView) findViewById(R.id.textViewResult);
        Button Calculate = (Button) findViewById(R.id.buttonCalculate);

        Calculate.setOnClickListener(new View.OnClickListener()  {
            @Override
            public void onClick(View v)  {
                inputUser=Double.parseDouble(Number.getText( ).toString(  ));
                DecimalFormat tenth = new DecimalFormat("#.#");

                if(radioButton4x6.isChecked( ))   {
                    if (inputUser <50) {
                        Number = small * inputUser;
                        Result.setText(tenth.format(Result) + " is your total cost!");

                    } else {
                        Toast.makeText(MainActivity.this,"Please enter a value less than 50", Toast.LENGTH_LONG).show();

                    }
                }
                if (radioButton5x7.isChecked( ))  {
                    if (inputUser <50) {
                        Number = medium * inputUser;
                        Result.setText(tenth.format(Result) + " is your total cost!");
                    }  else  {
                        Toast.makeText(MainActivity.this,"Please enter a value less than 50", Toast.LENGTH_LONG).show();
                    }
                }
                if (radioButton8x10.isChecked()) {
                    if (inputUser <50) {
                        Number = large * inputUser;
                        Result.setText(tenth.format(Result) + " is your total cost!");

                    }  else {
                        Toast.makeText(MainActivity.this,"Please enter a value less than 50", Toast.LENGTH_LONG).show();
                    }
                }
            }
        });

    }
}


预先感谢您可以提供的任何帮助。

最佳答案

我认为您应该像这样更改变量:

double inputUser;




final EditText inputUser = (EditText) findViewById(R.id.editTextNumber);


inputUser将对此代码感到困惑

inputUser=Double.parseDouble(Number.getText( ).toString(  ));


如果我是你,我会这样改变:

final EditText editUser= (EditText) findViewById(R.id.editTextNumber);

editUser=Double.parseDouble(editUser.getText( ).toString(  ));


然后像代码editUser <50一样会得到值

希望能帮助到你。

根据您的双印,更改如下:

prints=Double.parseDouble(editUser.getText( ).toString(  ));


那么您可以使用if像这样:

if (prints<50)

10-06 05:45
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