Question

我在将这个XML文件更改为android spinner时遇到了一些问题。我在Android开发中仍然是新手，我希望有人能帮助我。

<channel id="1">
<title>M</title>
<description>my new TV.  Viewer: 15+ </description>
<icon>image</icon>
<link>link</link>

Answer 1

你需要这样做

在strings.xml中定义：

<string-array name="array_name">
<item>Array Item One</item>
<item>Array Item two</item>
<item>Array Item Three</item>
</string-array>

在你的布局中：

<Spinner 
        android:id="@+id/spinner"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:drawSelectorOnTop="true"
        android:entries="@array/array_name"
    />

Answer 2

您可以使用Spinner对象向布局添加微调器。您通常应该在XML布局中使用元素执行此操作。例如：

<Spinner
android:id="@+id/planets_spinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />

如果您的微调器的所需选项是预先确定的，您可以为它们提供在values文件夹下的string.xml资源中定义的字符串数组，如下所示，

<?xml version="1.0" encoding="utf-8"?>
<resources>
<string-array name="planets_array">
<item>Mercury</item>
<item>Venus</item>
<item>Earth</item>
<item>Mars</item>
<item>Jupiter</item>
<item>Saturn</item>
<item>Uranus</item>
<item>Neptune</item>
</string-array>
</resources>

现在，您可以使用适配器将该数组列表分配给微调器对象，如下所示，

Spinner spinner = (Spinner) findViewById(R.id.spinner);
   // Create an ArrayAdapter using the string array and a default spinner layout
   ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
                            R.array.planets_array, android.R.layout.simple_spinner_item);
   // Specify the layout to use when the list of choices appears
   adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
   // Apply the adapter to the spinner
   spinner.setAdapter(adapter);

Answer 3

打开“res / values / strings.xml”文件，定义将在Spinner（下拉列表）中显示的项目列表。

文件：res / values / strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">MyAndroidApp</string>
    <string name="country_prompt">Choose a country</string>

    <string-array name="country_arrays">
        <item>Malaysia</item>
        <item>United States</item>
        <item>Indonesia</item>
        <item>France</item>
        <item>Italy</item>
        <item>Singapore</item>
        <item>New Zealand</item>
        <item>India</item>
    </string-array>

</resources>

Spinner（DropDown List）

打开“res / layout / main.xml”文件，添加两个微调器组件和一个按钮。

In “spinner1″, the “android:entries” represents the selection items in spinner.
In “spinner2″, the selection items will be defined in code later.

文件：res / layout / main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <Spinner
        android:id="@+id/spinner1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:entries="@array/country_arrays"
        android:prompt="@string/country_prompt" />

    <Spinner
        android:id="@+id/spinner2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <Button
        android:id="@+id/btnSubmit"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Submit" />

</LinearLayout>

3.File：MyAndroidAppActivity.java

package com.mkyong.android;

import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.Toast;

public class MyAndroidAppActivity extends Activity {

  private Spinner spinner1, spinner2;
  private Button btnSubmit;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    addItemsOnSpinner2();
    addListenerOnButton();
    addListenerOnSpinnerItemSelection();
  }

  // add items into spinner dynamically
  public void addItemsOnSpinner2() {

    spinner2 = (Spinner) findViewById(R.id.spinner2);
    List<String> list = new ArrayList<String>();
    list.add("list 1");
    list.add("list 2");
    list.add("list 3");
    ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
        android.R.layout.simple_spinner_item, list);
    dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinner2.setAdapter(dataAdapter);
  }

  public void addListenerOnSpinnerItemSelection() {
    spinner1 = (Spinner) findViewById(R.id.spinner1);
    spinner1.setOnItemSelectedListener(new CustomOnItemSelectedListener());
  }

  // get the selected dropdown list value
  public void addListenerOnButton() {

    spinner1 = (Spinner) findViewById(R.id.spinner1);
    spinner2 = (Spinner) findViewById(R.id.spinner2);
    btnSubmit = (Button) findViewById(R.id.btnSubmit);

    btnSubmit.setOnClickListener(new OnClickListener() {

      @Override
      public void onClick(View v) {

        Toast.makeText(MyAndroidAppActivity.this,
        "OnClickListener : " + 
                "\nSpinner 1 : "+ String.valueOf(spinner1.getSelectedItem()) + 
                "\nSpinner 2 : "+ String.valueOf(spinner2.getSelectedItem()),
            Toast.LENGTH_SHORT).show();
      }

    });
  }
}

文件：CustomOnItemSelectedListener.java

package com.mkyong.android;

import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.Toast;

public class CustomOnItemSelectedListener implements OnItemSelectedListener {

  public void onItemSelected(AdapterView<?> parent, View view, int pos,long id) {
    Toast.makeText(parent.getContext(), 
        "OnItemSelectedListener : " + parent.getItemAtPosition(pos).toString(),
        Toast.LENGTH_SHORT).show();
  }

  @Override
  public void onNothingSelected(AdapterView<?> arg0) {
    // TODO Auto-generated method stub
  }

}

Answer 4

首先在值文件夹下的.xml文件中创建字符串数组，如：

 <!-- Spinner Adapter Array -->
    <string-array name="Month">
        <item>JAN</item>
        <item>FEB</item>
        <item>MAR</item>
        <item>APR</item>
        <item>MAY</item>
        <item>JUN</item>
        <item>JUL</item>
        <item>AUG</item>
        <item>SEP</item>
        <item>OCT</item>
        <item>NOV</item>
        <item>DEC</item>
    </string-array>
    <!-- END -->

现在在布局文件中创建一个微调器视图，如：

<Spinner
                android:id="@+id/months"
                android:layout_width="300sp"
                android:layout_height="wrap_content"
                android:layout_alignParentRight="true"
                android:layout_alignParentTop="true"
                android:layout_gravity="center_vertical"
                android:layout_marginLeft="35dp"
                android:gravity="center"
                android:paddingLeft="10dp"
                android:prompt="@string/template_prompt" />

现在在您的activity类中创建一个适配器Like：

ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(activity, R.array.Month, R.layout.spinner_row);

将此适配器绑定到您的微调器对象之后比如：

yourSpinner.setAdapter(adapter);

哦，您也可以将下拉视图资源设置为适配器，如：

adapter.setDropDownViewResource(R.layout.spinner_textview);

将它绑定到微调器之前。希望它会对你有所帮助。

android微调器的代码

4 个答案: