我有一个listview,当点击listitem时会打开一个新的singleitenview活动 singleitenm视图包含一个按钮,用于将相应的listitem添加到收藏夹活动(如果尚未添加),并将按钮颜色更改为黄色,表示已添加到favoorites,或者如果不是收藏夹则为灰色 直到这里一切正常但如果我关闭singleitemview并重新打开它,按钮颜色会变回以前的颜色,但仍然在其他颜色中
如何保留按钮颜色
onitemclick我的列表活动
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
ObjectMapper mapper = new ObjectMapper();
Product pro = productListAdapter.getItem(position);
String favimg = ((ImageView) view.findViewById(R.id.imgbtn_favorite)).toString();
try
{
String hi = "this is testint";
String jsonInString = mapper.writeValueAsString(pro);
Intent intent = new Intent(activity.getApplicationContext(), SingleItemView.class);
intent.putExtra("selected item", jsonInString);
;
startActivityForResult(intent, 1);
// startActivity(intent);
}
catch (JsonProcessingException e)
{}
}
赞成singleitemview活动
final Button btn = (Button) findViewById(R.id.singleitemButton1);
btn.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v){
products=new ArrayList<Product>();
Bundle extras = getIntent().getExtras();
String jsonObj = extras.getString("selected item");
ObjectMapper mapper = new ObjectMapper();
try
{
Product pro = mapper.readValue(jsonObj, Product.class);
if (checkFavoriteItem(pro)) {
sharedPreference.removeFavorite(SingleItemView.this, pro);
btn.setBackgroundColor(Color.GRAY);
Toast.makeText(SingleItemView.this,
SingleItemView.this.getResources().getString(R.string.remove_favr),
Toast.LENGTH_SHORT).show();
} else {
sharedPreference.addFavorite(SingleItemView.this, pro);
Toast.makeText(SingleItemView.this,
SingleItemView.this.getResources().getString(R.string.add_favr),
Toast.LENGTH_SHORT).show();
btn.setBackgroundColor(Color.YELLOW);
}
}
catch (IOException e)
{};
});