我如何在選定的單選按鈕的同一行中獲取圖像？

Question

我有自定義列表，每行包含圖像，文本視圖和單選按鈕而不是單選組。 我只選擇一個單選按鈕。我想要獲取與所選單選按鈕相同行中的圖像。然後我用這個圖像設置背景 請幫我。

//rowadapter 
public class rowadapter extends ArrayAdapter<String> { 

private final Activity context; 
int layoutResourceId;  
private final String[] web; 
private final Integer[] imageId; 
int selectedPosition = -1; 
SharedPreferences sharedPref; 

public rowadapter(Activity context,String[] web, Integer[] imageId) { 
    super(context,R.layout.item_listview, web); 
    this.context = context; 
    this.web = web; 
    this.imageId = imageId; 
    sharedPref = context.getSharedPreferences("position",Context.MODE_PRIVATE); 

} 
public View getView(final int position, View row, ViewGroup parent) 
{ 
    LayoutInflater inflater = ((Activity)context).getLayoutInflater(); 
    backgroundholder holder = null; 
    View rowView=row; 

     rowView= inflater.inflate(R.layout.item_listview, null, true); 

     TextView txtTitle = (TextView) rowView.findViewById(R.id.txt); 
     final ImageView imageView = (ImageView) rowView.findViewById(R.id.img); 
     txtTitle.setText(web[position]); 
     imageView.setImageResource(imageId[position]); 
     holder = new backgroundholder();  
     holder.radiobutton = (RadioButton)rowView.findViewById(R.id.radiobutton); 
     holder.radiobutton.setChecked(position == selectedPosition); 
     holder.radiobutton.setTag(position); 
     int checkedpos=sharedPref.getInt("position",-1); 
     if(checkedpos==position) 
     { 
      holder.radiobutton.setChecked(true); 
     } 


     holder.radiobutton.setOnClickListener(new View.OnClickListener() {  
     public void onClick(View view) 
       { 
        selectedPosition = (Integer)view.getTag(); 
        RadioButton radio = (RadioButton)view; 
        if(radio.isChecked()) 
        { 
        Editor editor=sharedPref.edit(); 
        editor.putInt("position", selectedPosition); 
        editor.commit(); 
        } 
        Intent i=new Intent(getContext(), Preferences.class); 
        context.startActivity(i); 
        notifyDataSetInvalidated(); 

       } 

      });   

    return rowView; 


} 
static class backgroundholder 
{ 

    RadioButton radiobutton; 
} 

} 
//object class 
import android.widget.RadioButton; 


public class Item { 
String txt; 
Integer drawable; 
RadioButton radiobutton; 
boolean checked; 
public Item(String txt,Integer drawable,RadioButton radiobutton) 
{ 
this.txt=txt; 
this.drawable=drawable; 
this.radiobutton=radiobutton; 
} 

public String gettxt() 
{ 
return txt; 

} 
public Integer getInteger() 
{ 
return drawable; 

} 

public boolean ischecked() 
{ 
return checked; 

} 
public void setchecked(boolean checked) 
{ 
this.checked=checked; 
} 
} 

Answer 1

，如果你知道什麼是該行的TextView的價值，你可以用這個方法：

if (listview.getItemAtPosition(position).toString() == "item 1") { 
imageview.setImageResource(R.drawable.drawable1) 
} else if (listview.getItemAtPosition(position).toString() == "item 2") { 
imageview.setImageResource(R.drawable.drawable2) 
} 

編輯： 現在我再次看了你的問題，並找出你想改變單擊每個列表視圖項目的背景。那是對的嗎？

因爲你根本不需要getview。

首先你應該實現listview onItemClick，然後根據所選行的位置改變背景。

是這樣的：

在oncreat

：

list.setOnItemClickListener(new OnItemClickListener() { 

     @Override 
     public void onItemClick(AdapterView<?> arg0, View arg1, int position, 
       long arg3) { 

      if (listview.getItemAtPosition(position).toString() == "item 1") { 
       //put your change background code here 
      } else if (listview.getItemAtPosition(position).toString() == "item 2") { 
       //put your change background code here 
} 
     } 
    }); 

改變的背景下，您可以使用此代碼：

layout.setBackgroundDrawable(getResources().getDrawable(R.drawable.drawable));