Android 在Asynctask中更新GridView';行不通
我有一个GridView,我想在点击一个按钮后更新它(我想在点击后更改按钮的文本和颜色)。我试着用notifyDataSetChanged()完成它;在onClick方法内部,但什么也没有发生 我使用Asynctask将数据存储在我的SharedPreferes中(在PostExecute中),其中一部分数据是我单击的项/按钮的“品牌名”。我尝试使用notifyDataSetChanged()更新de视图;在PostExecute方法中,但不起作用 我比较getView方法中的数据以更改存储在SharedPreferences中的brandButton的颜色,如果单击其他按钮,我希望刷新视图 对不起,我的英语很差 这是我的getView方法Android 在Asynctask中更新GridView';行不通,android,gridview,android-asynctask,sharedpreferences,notifydatasetchanged,Android,Gridview,Android Asynctask,Sharedpreferences,Notifydatasetchanged,我有一个GridView,我想在点击一个按钮后更新它(我想在点击后更改按钮的文本和颜色)。我试着用notifyDataSetChanged()完成它;在onClick方法内部,但什么也没有发生 我使用Asynctask将数据存储在我的SharedPreferes中(在PostExecute中),其中一部分数据是我单击的项/按钮的“品牌名”。我尝试使用notifyDataSetChanged()更新de视图;在PostExecute方法中,但不起作用 我比较getView方法中的数据以更改存储在S
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
View grid;
LayoutInflater inflater = (LayoutInflater) mContext
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
grid = new View(mContext);
grid = inflater.inflate(R.layout.grid_single, null);
TextView brandName = (TextView) grid.findViewById(R.id.grid_text);
ImageView brandLogo = (ImageView) grid.findViewById(R.id.grid_image);
ImageView twitterImg = (ImageView) grid.findViewById(R.id.twitterImg);
ImageView facebookImg = (ImageView) grid.findViewById(R.id.facebookImg);
ImageView instagramImg = (ImageView) grid.findViewById(R.id.instagramImg);
Button selectBrand = (Button) grid.findViewById(R.id.selectBrand);
if(mBrandGenericData.getDataList().get(position).socialList.size()>0){
for(int i=0; i<mBrandGenericData.getDataList().get(position).socialList.size(); i++){
if(mBrandGenericData.getDataList().get(position).socialList.get(i).socialType.equalsIgnoreCase("FB")){
facebookImg.setImageDrawable(facebookDrawable);
}
if(mBrandGenericData.getDataList().get(position).socialList.get(i).socialType.equalsIgnoreCase("TW")){
twitterImg.setImageDrawable(twitterDrawable);
}
if(mBrandGenericData.getDataList().get(position).socialList.get(i).socialType.equalsIgnoreCase("IT")){
instagramImg.setImageDrawable(instagramDrawable);
}
}
}
new ImageLoadTask("http://api.socialmanageranalytics.com/"+mBrandGenericData.getDataList().get(position).logo, brandLogo).execute();
brandName.setText(mBrandGenericData.getDataList().get(position).name);
//Here i change the color and text of my button
if (brandName.getText().equals(PreferenceManager.getDefaultSharedPreferences(mContext).getString("brandName", ""))){
selectBrand.setText(R.string.selected);
selectBrand.setBackgroundColor(0xFF18abd5);
}
selectBrand.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
new SelectBrandTask("http://api.socialmanageranalytics.com/"+mBrandGenericData.getDataList().get(position).logo, mBrandGenericData.getDataList().get(position).name, mBrandGenericData.getDataList().get(position).id).execute();
CustomGrid.this.notifyDataSetChanged();
}
});
} else {
grid = (View) convertView;
}
return grid;
}
public View getView(最终int位置、视图转换视图、视图组父视图){
//TODO自动生成的方法存根
视图网格;
LayoutFlater充气器=(LayoutFlater)mContext
.getSystemService(上下文布局\充气机\服务);
if(convertView==null){
网格=新视图(mContext);
网格=充气机。充气(R.layout.grid_single,null);
TextView品牌名称=(TextView)grid.findviewbyd(R.id.grid\u text);
ImageView品牌徽标=(ImageView)grid.findViewById(R.id.grid\u image);
ImageView twitterImg=(ImageView)grid.findViewById(R.id.twitterImg);
ImageView facebookImg=(ImageView)grid.findViewById(R.id.facebookImg);
ImageView instagramImg=(ImageView)grid.findViewById(R.id.instagramImg);
Button selectBrand=(Button)grid.findViewById(R.id.selectBrand);
if(mBrandGenericData.getDataList().get(position).socialList.size()>0){
对于(int i=0;i而言,问题在于您仅在convertView==null
时设置视图的值,在调用getView()
的前几次之后,这种情况可能不会出现
如果将调用移动到convertView
为空的块之外,以将TextView的文本/颜色设置为空,则下载数据后,代码应能正常工作
由于您必须将TextView的声明移到方法之外,因此您应该真正使用某种ViewHolder,以使您的生活更轻松,适配器更高效。实际上,在解释它方面做得很好,但这里有一点与您的代码相关:
public View getView(final int position, View convertView, ViewGroup parent) {
final BrandsHolder holder;
if(convertView == null){
holder = new BrandsHolder();
convertView = inflater.inflate(R.layout.grid_single, parent, false);
holder.brandName = (TextView)convertView.findViewById(R.id.grid_text);
.... // The rest of your item declarations
convertView.setTag(holder);
}
else holder = (BrandsHolder)convertView.getTag();
final BrandGenericData brandData = BrandGenericData.getDataList().get(position);
new ImageLoadTask("http://api.socialmanageranalytics.com/" + brand.logo, holder.brandLogo).execute();
holder.brandName.setText(brand.name);
if (holder.brandName.getText().equals(PreferenceManager.getDefaultSharedPreferences(mContext).getString("brandName", ""))){
holder.selectBrand.setText(R.string.selected);
holder.selectBrand.setBackgroundColor(0xFF18abd5);
}
... // Any other adjustments you want to make for each item
}
private class BrandsHolder {
TextView brandName;
ImageView brandLogo;
Button selectBrand;
... // The rest of your ViewHolder's variable declarations
}
代码需要您填写其余部分,但我认为这应该为您指明正确的方向
public View getView(final int position, View convertView, ViewGroup parent) {
final BrandsHolder holder;
if(convertView == null){
holder = new BrandsHolder();
convertView = inflater.inflate(R.layout.grid_single, parent, false);
holder.brandName = (TextView)convertView.findViewById(R.id.grid_text);
.... // The rest of your item declarations
convertView.setTag(holder);
}
else holder = (BrandsHolder)convertView.getTag();
final BrandGenericData brandData = BrandGenericData.getDataList().get(position);
new ImageLoadTask("http://api.socialmanageranalytics.com/" + brand.logo, holder.brandLogo).execute();
holder.brandName.setText(brand.name);
if (holder.brandName.getText().equals(PreferenceManager.getDefaultSharedPreferences(mContext).getString("brandName", ""))){
holder.selectBrand.setText(R.string.selected);
holder.selectBrand.setBackgroundColor(0xFF18abd5);
}
... // Any other adjustments you want to make for each item
}
private class BrandsHolder {
TextView brandName;
ImageView brandLogo;
Button selectBrand;
... // The rest of your ViewHolder's variable declarations
}