Question

我正在尝试建立一个单位为1到1000或以上的结算应用程序，有一定的条件来计算要支付的总金额。如果客户消费1到20个单位，他将收取卢比。 30（最低费用）+卢比。每单位3，意味着如果他消耗12个单位他必须支付Rs（30 + 12 * 3）= 66卢比，如果他消耗超过20个单位还有另一个条件，最低费用将是卢比。 110和每单位费用将是7卢比。现在，如果消费者消费25个单位，那么他必须支付卢比（110+（25-20）* 7）=卢比145.我完全搞不清楚从哪里开始。我已经制作了一个布局文件和java文件。如果有人帮助我，我将感激不尽。

activity_main.xml中

package com.example.android.nepalelectricity;

import android.content.Intent;
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.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    EditText input;
    Button calculate;
    Button clear;
    Button credits;
    Button exit;
    TextView result;


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

        input=new EditText(this);
        calculate = new Button(this);
        result=new TextView(this);
        clear=new Button(this);
        credits = new Button(this);
        exit = new Button(this);

        input=(EditText)findViewById(R.id.input);
        credits = (Button) findViewById(R.id.credits);
        clear = (Button) findViewById(R.id.clear);
        exit = (Button) findViewById(R.id.exit);
        calculate = (Button) findViewById(R.id.calculate);
        result=(TextView)findViewById(R.id.result);

        calculate.setOnClickListener(new View.OnClickListener() {
            // Perform action on Calculate Button click
            @Override
            public void onClick(View v) {

               //  i am confused in this section
               /* if (input.getText().length()==0){
                    result.setText(R.string.err_msg);
                }
                else {
                    result.setText("You are great");
                    //change the integer value into string
                   result.setText("");
                    int input1 = Integer.parseInt(input.getText().toString());


                }  */
                //Till here

            }
        });


        clear.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                input.setText("");
                result.setText("");
            }
        });
        credits.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(MainActivity.this, Credits.class));
            }
        });



        exit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Toast.makeText(MainActivity.this, "Thank you for using app!", Toast.LENGTH_SHORT).show();
                finish();

            }
        });
    }

}

MainActivity.java

Header set Access-Control-Allow-Origin: http://www.somedomain.com

Answer 1

使用如下逻辑：

calculate.setOnClickListener(new View.OnClickListener() {
   // Perform action on Calculate Button click
   @Override
   public void onClick(View v) {
        String value = input.getText().toString(); // if error occur here try this : String.valueOf(input.getText().toString());
        if(TextUtils.isEmpty(value)){
           //make toast saying value is null/empty
        }
        else{
          final int inputValue = Integer.parseInt(value);  

          if(inputValue > 1 && inputValue <= 20){
          result.setText(Integer.toString((inputValue*3)+30)); //try avoiding brackets in calculation if error occur, computer does not understand BODMAS calculation format.
          }
          else if(inputvalue > 20){
          result.setText(Integer.toString(((inputValue-20)*7)+110)); //try avoiding brackets in calculation if error occur, computer does not understand BODMAS calculation format.
          }
          else{
               // make toast saying value not in range
          }
       }
      }
    });

我如何在android studio中实现多个条件

1 个答案: