Android spinner 普通用法和自定义用法

男娘i 2022-08-27 06:59 231阅读 0赞

1.利用ArrayAdapter实现spinner的普通用法

private String[]  contents={"red","orange","green","blue","yellow"};
    private Spinner spinner;
    private TextView textView;
    
    ArrayAdapter adapter = new ArrayAdapter(this,android.R.layout.simple_spinner_dropdown_item,contents);
    		adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    		spinner.setAdapter(adapter);
    		
    		spinner.setOnItemSelectedListener(new OnItemSelectedListener(){
    
    
    			@Override
    			public void onItemSelected(AdapterView<?> parent, View view,
    					int position, long id) {
    				// TODO Auto-generated method stub
    				
    				textView.setText(contents[position]);
    				
    				
    				
    			}
    
    
    			@Override
    			public void onNothingSelected(AdapterView<?> parent) {
    				// TODO Auto-generated method stub
    				
    			}
    			
    		});

2.继承BaseAdapter实现自定义adapter

spinner现实的内容，如TextView+ ImageView

1> custom\_spinner\_layout.xml

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal">
    <TextView
    android:id="@+id/text_view"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>
    
    <ImageView
    android:id="@+id/image_view"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/show_image"/>
    </LinearLayout>

2>定义MyAdapter

public class MyAdapter extends BaseAdapter {
    
    	private Context context;
    	private String[] contents;
    	private LayoutInflater flater;
    	
    	public MyAdapter(Context context,String[] contents){
    		this.context = context;
    		this.contents = contents;
    		this.flater = LayoutInflater.from(context);
    	}
    	
    	@Override
    	public int getCount() {
    		// TODO Auto-generated method stub
    		return contents.length;
    	}
    
    	@Override
    	public Object getItem(int position) {
    		// TODO Auto-generated method stub
    		return contents[position];
    	}
    
    	@Override
    	public long getItemId(int position) {
    		// TODO Auto-generated method stub
    		return position;
    	}
    
    	@Override
    	public View getView(int position, View convertView, ViewGroup parent) {
    		// TODO Auto-generated method stub
    		MyView myView; 
    		if(convertView == null){
    			myView = new MyView();
    			convertView = flater.inflate(R.layout.custom_spinner_layout, null);
    			myView.imageView = (ImageView)convertView.findViewById(R.id.image_view);
    			myView.textView = (TextView) convertView.findViewById(R.id.text_view);
    			convertView.setTag(myView);
    		}else{
    			myView = (MyView)convertView.getTag();
    		}
    		
    		
    		myView.imageView.setBackgroundResource(R.drawable.show_image);
    		myView.textView.setText(contents[position]);
    		
    		return convertView;
    		
    	}
    	
    	class MyView{
    		public ImageView imageView;
    		public TextView textView;
    	}
    
    }

3>调用自定义的MyAdapter

MyAdapter myAdapter = new MyAdapter(this,contents);

spinner.setAdapter(myAdapter);