如何设置android微调器提示的样式

时间:2012-10-16 11:27:58

标签: android android-spinner prompt

我已经开发了一个例子。

在这里,我必须设置一个微调器提示。请帮我。我该如何设计呢?

这是我的 string.xml 代码:

<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, CustomizedListView!</string>
<string name="app_name">CustomizedListView</string>
<string name="status_prompt">Choose a Status</string>
</resources>

此代码用于我的main.xml:

<Spinner android:id="@+id/spinner1" 
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_x="106dp"
    android:layout_y="100dp"
    android:prompt="@string/status_prompt" 
    android:background="@drawable/btn_dropdown"/>

我希望在下面的图片中更改背景颜色和textSizetextStyle。我怎样才能改变这一点。

spinner prompt

修改 我在 styles.xml

中添加了以下代码
<style name="spinner_style">                        
<item name="android:layout_width">fill_parent</item>
<item name="android:layout_height">wrap_content</item>
<item name="android:textColor">#040404</item>
<item name="android:typeface">monospace</item>
<item name="android:background">#FFFFFF</item>
</style>

还在main.xml的下面添加了spinner:

  style="@style/spinner_style"   

但它也不适用于我。如何设置微调器提示信息的样式。

修改

这是ArrayAdaper的我的java代码:

 ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_spinner_item, list);
    //set the view for the Drop down list
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    //set the ArrayAdapter to the spinner
    spinner.setAdapter(adapter);
    adapter.notifyDataSetChanged();
    //attach the listener to the spinner
    spinner.setOnItemSelectedListener(new MyOnItemSelectedListener());

    }

如何在此处设置提示样式。

2 个答案:

答案 0 :(得分:3)

为了更改提示,您需要使用与@ aswin-kumar建议的方法类似的方法,但为下拉列表的第一个元素使用单独的样式:

首先,展开ArrayAdapter并将其称为CustomArrayAdapter: package com.example.project;

package com.example.project;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
import android.widget.TextView;

import java.util.List;


// I extend this using ArrayAdapter<String>, but you can use anything as the type
// parameter, or parameterize it as necessary.
public class CustomArrayAdapter extends ArrayAdapter<String> {

    private String title;

    public CustomArrayAdapter(Context aContext, int aTextViewResource, List<String> aOptions, String title) {
        super(aContext, aTextViewResource, aOptions);
        this.title = title;
    }

    @Override
    public View getDropDownView(int aPosition, View aConvertView, ViewGroup aParent) {

        LinearLayout v = null;

        if (aPosition == 0) {
            LayoutInflater inflater = (LayoutInflater)getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            v = (LinearLayout) inflater.inflate(R.layout.dropdown_header, aParent, false);
            TextView tv = (TextView) v.findViewById(R.id.dropdown_item);
            tv.setText(getItem(aPosition));
        } else {
            LayoutInflater inflater = (LayoutInflater)getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            v = (LinearLayout) inflater.inflate(R.layout.dropdown_item, aParent, false);
            TextView tv = (TextView) v.findViewById(R.id.dropdown_item);
            tv.setText(getItem(aPosition));
            tv.setHeight((int) (tv.getTextSize() * 2));
        }


        return v;
    }

    @Override
    public int getCount() {
        return super.getCount() + 1;
    }

    @Override
    public String getItem(int position) {
        if (position == 0) {
            return title;
        }
        return super.getItem(position - 1);
    }

    @Override
    public boolean isEnabled(int position) {
        return position != 0;
    }
}

现在,为dropdown_header.xml使用以下布局:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <TextView
        android:id="@+id/dropdown_item"
        android:textColor="@android:color/black"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingTop="16dp"
        android:paddingBottom="16dp"
        android:paddingLeft="16dp"
        android:gravity="left|center_vertical"
        android:textSize="9pt" />

    <!-- This adds a black separator line between the title and the items. You can remove
         if you want -->
    <LinearLayout
        android:id="@+id/separator"
        android:layout_height="4dp"
        android:layout_width="match_parent"
        android:background="@android:color/black"
        android:orientation="vertical"/>
    </LinearLayout>

表单视图布局文件(form_view_layout.xml):

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/spinner_dialog_root"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textSize="9pt" />

微调器布局文件(spinner_layout.xml):

 <Spinner
android:id="@+id/spinner"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:background="@android:color/transparent"/>

现在,将新适配器附加到Spinner

CustomArrayAdapter adapter = new CustomArrayAdapter(aActivity, R.layout.form_view_layout, aModel.getEnumerableOptions(), aModel.getTitle());
View parentView = aActivity.getLayoutInflater().inflate(R.layout.spinner_layout, aParent, false);

spinner = (Spinner) parentView.findViewById(R.id.spinner);
spinner.setAdapter(adapter);

最后,将要显示的字符串添加到微调器适配器adapter,并设置相应文件的样式,您应该好好去。

答案 1 :(得分:2)

您需要为从ArrayAdapter延伸的微调器创建自己的适配器。当布局系统指示您需要绘制您在pic中显示的视图时,将调用getView()函数。您可以覆盖它并添加textSize,textStyle等

更新:粗略的代码示例如下:

private class MySpinnerAdapter extends ArrayAdapter<String> {
        public MySpinnerAdapter(Context context, int resource,
                int textViewResourceId, List<String> objects) {
            super(context, resource, textViewResourceId, objects);
        }

    public View getView(int position, View convertView,
            ViewGroup parent) {
        View v = super.getView(position, convertView, parent);
        // apply the style and sizes etc to the Text view from this view v
        // like ((TextView)v).setTextSize(...) etc
        return v;
    }

    public View getDropDownView(int position, View convertView,
            ViewGroup parent) {
        // this is for each of the drop down resource that is created. 
            // you can style these things too
        }
}

使用它作为微调器的适配器:

mySpinner.setAdapter(new MySpinnerAdapter(ActivityName.this,
                    R.layout.spinner_item,
                    R.id.spinner_item_TextView, 
                    listOfItemsInSpinner));