从其他类获取微调器值并将其分配给 editText

Question

我正在尝试安卓应用程序。我对 Java 还是很陌生，还在学习。我正在创建一个微调器并试图获得价值。我正在尝试将课程从主页调用到另一个课程。我收到吐司消息。现在我想将该值传递给同一页面上的编辑文本。有人可以指导我如何获取editText中的值吗？

提前致谢！

我的activity_main_page.xml

<Spinner
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/token_spinner"
    android:layout_above="@+id/textView5"
    android:layout_alignStart="@+id/textView3" />

<EditText
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:ems="10"
    android:id="@+id/editText_order"
    android:layout_alignEnd="@+id/textView2"
    android:layout_alignStart="@+id/token_spinner" />

我的 MainPage.Java

public class MainPage extends AppCompatActivity {

    Spinner spinner;

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

        //Drop Down List Selction of Token
        Spinner spinner = (Spinner) findViewById(R.id.token_spinner);

        ArrayAdapter adapter = ArrayAdapter.createFromResource(this,
                R.array.plan_array, android.R.layout.simple_spinner_item);

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

        spinner.setOnItemSelectedListener(new TokenSpinner());
    }

}

TokenSpinner.java

public class TokenSpinner implements AdapterView.OnItemSelectedListener {

    @Override
    public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
        String token = adapterView.getItemAtPosition(i).toString();

        if (plan.equals("154")) {
            Toast.makeText(adapterView.getContext(), "Token " + token, Toast.LENGTH_LONG).show();

    //I am gettin Toast here 
    //do something and assign to editText ordervalue

        }
    }

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

    }
}

Answer 1

您在微调器中选择一个项目，它将在 EditText 中设置..

EditText textField =(EditText)findViewById(R.id.item_edittext);
        Spinner spineer;
        spinner= (Spinner)findViewById(R.id.spinner_item);
        spineer.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l{ 
        String selectedItemInSpinner=spinner.getSelectedItem().toString(); 
        textField.setText(selectedItemInSpinner);
        }
                    @Override
                    public void onNothingSelected(AdapterView<?> adapterView) {}
        });

修改后的代码

好的，我不知道这是好方法还是坏方法，但是将 EditText 设为 public static 将解决您的问题

Mainactivity.java

import android.content.Intent;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Spinner;

public class MainActivity extends AppCompatActivity {
    public  static String selectedItemInSpinner="";
    Spinner spinner;
    public static EditText editText;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //Drop Down List Selction of Token
         spinner = (Spinner) findViewById(R.id.token_spinner);
        editText = (EditText) findViewById(R.id.editText_order);

        ArrayAdapter adapter = ArrayAdapter.createFromResource(this,
                R.array.plan_array, android.R.layout.simple_spinner_item);

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

        spinner.setOnItemSelectedListener(new TokenSpinner());
        editText.setText(selectedItemInSpinner);
    }}

TokenSpinner 类

public class TokenSpinner implements android.widget.AdapterView.OnItemSelectedListener {

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
       MainActivity.selectedItemInSpinner=parent.getSelectedItem().toString();
        MainActivity.editText.setText(MainActivity.selectedItemInSpinner);
    }

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

    }
}

XML

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    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"
android:orientation="vertical"
    >
    <Spinner
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/token_spinner"
        />
    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:ems="10"
        android:id="@+id/editText_order"
        />
</LinearLayout>

Answer 2

您可以使用 Intent 的 putExtra() 方法传递它。试试这个方法，

在第一个活动中，

Intent intent = new Intent ( FirstAcvity.this, SecondActivity.class ); 
intent.putExtra ( "TextBox", editText.getText().toString() );
startActivity(intent);

在第二个活动中：

Intent i = getIntent(); 
tring text = i.getStringExtra ( "TextBox","" ); 
secondEditText.setText ( text );