How to wrap lengthy text in a spinner

参考自： http://stackoverflow.com/questions/6107500/how-to-wrap-lengthy-text-in-a-spinner

扩展自Adapter 的适配器是在Spinner与数据之间的一座桥梁。一个Spinner Adapter允许定义两个不同的视图：一是在Spinner上显示数据，另一个是当Spinner按下时在下拉列表里显示数据。重载getDropDownView(int position, View convertView,ViewGroup parent)及getView(int position, View convertView, ViewGroup parent)方法。

第一步：将spinner使用的TextView 的singleLine属性设为false，即： tv.setSingleLine( false );

private class SpinnerAdapter extends ArrayAdapter<String> {

Context context ;

String[] items = new String[] {};

public SpinnerAdapter( final Context context,

final int textViewResourceId, final String[] objects) {

super (context, textViewResourceId, objects);

this . items = objects;

this . context = context;

@Override

public View getDropDownView( int position, View convertView,

ViewGroup parent) {

if (convertView == null ) {

LayoutInflater inflater = LayoutInflater. from ( context );

convertView = inflater.inflate(

R.layout. multiline_spinner_dropdown_item , parent, false );

TextView tv = (TextView) convertView.findViewById(android.R.id. text1 );

tv.setSingleLine( false );

tv.setText( items [position]);

tv.setTextColor(Color. BLACK );

// tv.setTextSize(20);

return convertView;

@Override

public View getView( int position, View convertView, ViewGroup parent) {

if (convertView == null ) {

LayoutInflater inflater = LayoutInflater. from ( context );

convertView = inflater.inflate(

android.R.layout. simple_spinner_item , parent, false );

// android.R.id.text1 is default text view in resource of the android.

// android.R.layout.simple_spinner_item is default layout in resources of android.

TextView tv = (TextView) convertView.findViewById(android.R.id. text1 );

tv.setSingleLine( false );

tv.setText( items [position]);

tv.setTextColor(Color. BLACK );

// tv.setTextSize(20);

return convertView;

这个方法的关键是拷贝 android.R.layout.simple_spinner_dropdown_item 下的layout到自己的项目中，并将 CheckedTextView 下的singleLine属性设置为false；为此，先在res/layout目录下创建一个名为multiline_spinner_dropdown_item.xml的文件，代码如下：

< CheckedTextView xmlns:android = "http://schemas.android.com/apk/res/android"

android:id = " @android:id/text1 "

style = "?android:attr/spinnerDropDownItemStyle"

android:singleLine = "false"

android:layout_width = "match_parent"

android:layout_height = "?android:attr/listPreferredItemHeight"

android:ellipsize = "marquee" />

第三步：声明Spinner并将其与适配器（ SpinnerAdapter ）关联

spinner_patrol =(Spinner)findViewById(R.id. spinner_patrol );

SpinnerAdapter adapter = new SpinnerAdapter( this ,

R.layout. multiline_spinner_dropdown_item , xccqcsArray );

大功告成！！！类似效果图

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