java - 从微调器中为项目设置值

Question

所以我创建了一个 Spinner 并在其中设置了 5 个值。我正在构建一个计算器，并希望 Spinner 中的每个项目都有一些值(它们有文本值，但我希望它们有数字值)。在此之前，用户必须输入他的 TDEE，不用管它，它只是一个数字，然后该数字乘以所选微调项目的值。当单击按钮时，这一切都会发生，然后在 TextView 中打印该值。

问题是，我不知道如何将值传递给微调项目。

代码如下:

字符串:

<string-array name="razina_aktivnosti">
        <item>Sjedeći (Malo ili bez aktivnosti, pretežno sjedeći posao)</item>
        <item>Laka aktivnosti (Lake vježbe/sport 1-3 dana tjedno)</item>
        <item>Umjeren (Umjerene vježbe/sport 3-5 dana tjedno)</item>
        <item>Teške aktivnosti (Teže vježbe/sport 6-7 dana tjedno)</item>
        <item>Ekstremne aktivnosti (Teške dnevne vježbe/sport i fizički posao 2 x dnevno)</item>

    </string-array>

XML:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="hr.app.liftme.liftmehr.KalkulatoriTDEE"
    tools:showIn="@layout/activity_kalkulatori_tdee">


    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/linearLayout22"
        android:layout_marginBottom="10dp">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:text="Unesite svoj BMR:"
            android:id="@+id/textView115" />

        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="numberDecimal"
            android:ems="10"
            android:id="@+id/editBMRInput" />
    </LinearLayout>

    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/linearLayout22"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:id="@+id/linearLayout23"
        android:layout_marginBottom="10dp">

        <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textAppearance="?android:attr/textAppearanceLarge"
                android:text="Odaberite razinu aktivnosti"
                android:id="@+id/aktivnost"
            android:layout_below="@+id/linearLayout22"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true" />

        <Spinner
                android:id="@+id/spinnerTDEE"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@+id/aktivnost"
                android:layout_alignParentLeft="true">

        </Spinner>
    </LinearLayout>

    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/linearLayout23">

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Izračunaj"
            android:id="@+id/btnIzracunajTDEE"
            android:layout_gravity="center_horizontal"
            android:layout_marginBottom="10dp"
            android:background="#424242"
            android:textColor="#ffffff" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:text="Vaš TDEE je:"
            android:id="@+id/textView116"
            android:layout_gravity="center_horizontal"
            android:layout_marginBottom="5dp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:id="@+id/textViewRezultatTDEE"
            android:layout_gravity="center_horizontal" />
    </LinearLayout>

</RelativeLayout>

Java:

package hr.app.liftme.liftmehr;

import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;

public class KalkulatoriTDEE extends AppCompatActivity {
    Spinner spinner;
    ArrayAdapter<CharSequence> adapter;
    Button btnIzracunaj;
    EditText editBMRInput;
    TextView textViewRezultat;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_kalkulatori_tdee);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        Intent intent = getIntent();





        spinner = (Spinner) findViewById(R.id.spinnerTDEE);
        adapter = ArrayAdapter.createFromResource(this, R.array.razina_aktivnosti, android.R.layout.simple_spinner_item);

        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(adapter);


        btnIzracunaj = (Button) findViewById(R.id.btnIzracunajTDEE);

        editBMRInput = (EditText) findViewById(R.id.editBMRInput);

        textViewRezultat = (TextView) findViewById(R.id.textViewRezultatTDEE);

        btnIzracunaj.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v){
                double prvoPolje = Double.parseDouble(editBMRInput.getText().toString());
                // HERE'S WHERE I'VE STUCKED!!!

                double rezultat = 0;



                btnIzracunaj.setText(Double.toString(rezultat));
            }
        });


        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(getBaseContext(), parent.getItemIdAtPosition(position)+" selected", Toast.LENGTH_LONG).show();
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }


        });



    }

}

有什么想法吗？

Answer 1

使用Spinner中的getSelectedItem() :

spinner.getSelectedItem().toString()

因此，在您的代码中将 btnIzracunaj 监听器替换为:

btnIzracunaj.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
      Toast.makeText(MainActivity.this, spinner.getSelectedItem().toString(), Toast.LENGTH_SHORT).show();
  }
});

您将必须解析 strings.xml 中的内容。我建议您将它们设置为数字以进行测试:

<string-array name="razina_aktivnosti">
  <item>1.1</item>
  <item>2.2</item>
  <item>3.3</item>
  <item>4.4</item>
  <item>5.5</item>
</string-array>

<小时/>

编辑:

当您的 strings.xml 设置为仅 float 时，您的新 onClickListener 将如下所示:

btnIzracunaj.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        double prvoPolje = Double.parseDouble(editBMRInput.getText().toString());
        double rezultat = 0;
        Toast.makeText(MainActivity.this, spinner.getSelectedItem().toString(), Toast.LENGTH_SHORT).show();
        rezultat = Double.valueOf(spinner.getSelectedItem().toString());
        btnIzracunaj.setText(String.valueOf(rezultat * prvoPolje));
    }
});