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为微调器项指定其下拉列表的宽度

android-studio xml android

mrmeaaan · 技术社区 · 7 年前

我的布局中有一个微调器问题。

看看这张照片有什么想法。

没有简单的方法将项目宽度设置为实际的下拉菜单宽度吗?

<android.support.v7.widget.AppCompatSpinner
    android:id="@+id/spellSpinner"
    android:layout_width="0dp"
    android:layout_height="match_parent"
    android:layout_weight="1"
    android:layout_marginStart="10dp"
    android:layout_marginEnd="10dp"
    android:dropDownWidth="match_parent"
    android:spinnerMode="dropdown"
    android:popupBackground="#fff"
    android:background="#8A8A8A"/>

我的Java代码:

spinnerSpells = findViewById(R.id.spellSpinner);
ArrayAdapter < CharSequence > adapter = ArrayAdapter.createFromResource(spellActivity.this, R.array.dropdownCategory, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerSpells.setAdapter(adapter);

spinnerSpells.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
  @Override
  public void onItemSelected(AdapterView << ? > adapterView, View view, int i, long l) {
    getSpellList(spinnerSpells.getSelectedItem().toString(), switchSpells.isChecked());
    // do some other stuff [...]
  }

  @Override
  public void onNothingSelected(AdapterView << ? > adapterView) {
    getSpellList(spinnerSpells.getSelectedItem().toString(), switchSpells.isChecked());
   // do some other stuff [...]
  }
});

致以最诚挚的问候

另外,我真的没有在论坛上找到任何关于那件事的帖子。

5 回复 | 直到 7 年前

mrmeaaan 7 年前

老实说,他们的回答并没有真正帮助我,但给了我很好的暗示。我自己找到了解决问题的方法(还实现了标签前面的图像)。

我张贴我的代码:

package edmt.dev.androidgridlayout;

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

public class xCustomSpinnerAdapater extends ArrayAdapter<String> {

    Context mContext;
    String[] spinnerNames;
    int[] spinnerImages;

    public xCustomSpinnerAdapater( Context mContext, String[] spinnerNames, int[] spinnerImages) {
        super(mContext, R.layout.x_custom_spinner, spinnerNames);
        this.mContext = mContext;
        this.spinnerNames = spinnerNames;
        this.spinnerImages = spinnerImages;
    }


    @Override
    public View getDropDownView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {

            LayoutInflater inflater = (LayoutInflater)mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            View row = inflater.inflate(R.layout.x_custom_spinner,null);
            TextView tvSpinnerText = row.findViewById(R.id.tvSpinnerText);
            ImageView ivSpinnerImage = row.findViewById(R.id.ivSpinnerImage);

            tvSpinnerText.setText(spinnerNames[position]);
            ivSpinnerImage.setImageResource(spinnerImages[position]);

        return row;
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {

        LayoutInflater inflater = (LayoutInflater)mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View row = inflater.inflate(R.layout.x_custom_spinner,null);
        TextView tvSpinnerText = row.findViewById(R.id.tvSpinnerText);
        ImageView ivSpinnerImage = row.findViewById(R.id.ivSpinnerImage);

        tvSpinnerText.setText(spinnerNames[position]);
        ivSpinnerImage.setImageResource(spinnerImages[position]);

        return row;
    }
}

相应地添加了一个xml文件:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="40dp"
    android:orientation="horizontal"
    >

    <ImageView
        android:id="@+id/ivSpinnerImage"

        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="3"

        android:padding="5dp"
        android:src="@drawable/artifact"
        />
    <TextView
        android:id="@+id/tvSpinnerText"

        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="7"
        android:gravity="center"

        android:text="Accessory"
        android:textSize="18sp"

        />

</LinearLayout>

之后我编辑了我的主要活动如下:

[..]

  private xCustomSpinnerAdapater spinnerAdapter;
    private String[] spinnerNames = {"All", "Black", "Blue", "Green", "Red"};
    private  int[] spinnerImages = {R.drawable.artifact, R.drawable.black, R.drawable.blue, R.drawable.green, R.drawable.red};


[..]

protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_spell);
        
        spinnerSpells = findViewById(R.id.spellSpinner);
        spinnerAdapter = new xCustomSpinnerAdapater(this, spinnerNames,spinnerImages);
        spinnerSpells.setAdapter(spinnerAdapter);


        spinnerSpells.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
                Toast.makeText(getApplicationContext(),spinnerNames[i],Toast.LENGTH_LONG).show();
               [...]
            }

            @Override
            public void onNothingSelected(AdapterView<?> adapterView) {
                [...]
        });

Vijaya Varma Lanke 7 年前

为微调器项使用自定义XML文件。

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

<TextView  
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" 
android:layout_height="wrap_content"
android:textSize="20sp"
android:gravity="left"  
android:textColor="#FF0000"         
android:padding="5dip"
/>

使用此文件可显示微调器项,如:

ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, 
R.layout.spinner_item,list);

karan 7 年前

为微调器textview创建单独的布局

R.layout.spinner\u文本

<TextView xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@android:id/text1"
    android:maxLines="1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textSize="your_size_in_dp" />

设置适配器如下

ArrayAdapter < CharSequence > adapter = ArrayAdapter.createFromResource(spellActivity.this, R.array.dropdownCategory, R.layout.spinner_text);

Gowthaman M manas.abrol 7 年前

使用在xml中

    android:dropDownWidth="fill_parent| match_parent| wrap_content"
    android:spinnerMode="dropdown"

有关详细信息,请单击: https://developer.android.com/reference/android/widget/Spinner.html#setDropDownWidth(int)

Pramila Shankar 7 年前

微调器数组列表将其设为“dropdowncegory.xml”

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="dropdownCategory">
        <item>All</item>
        <item>Black</item>
        <item>Blue</item>
        <item>Green</item>
        <item>Red</item>
    </string-array>
</resources>

<android.support.v7.widget.AppCompatSpinner
 android:id="@+id/spellSpinner"
 android:layout_width="0dp"
 android:layout_height="match_parent"
 android:layout_weight="1"
 android:layout_marginStart="10dp"
 android:layout_marginEnd="10dp"
 android:dropDownWidth="wrap_content"
 android:spinnerMode="dropdown"
 android:popupBackground="#fff"
 android:background="#8A8A8A"/>

在onCreate的activity.java类中

Spinner spinnerSpells = findViewById(R.id.spellSpinner);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(spellActivity.this, R.array.dropdownCategory, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerSpells.setAdapter(adapter);

spinnerSpells.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
 // do something [...]
 }

@Override
public void onNothingSelected(AdapterView<?> adapterView) {
   // do something [...]
});