android常见错误一

Myth丶恋晨 2022-07-28 04:08 208阅读 0赞

今天用xUtils框架做开发时，遇到一个奇怪的错误。如下所示：

03-29 21:46:13.014: E/SubmitMessage(20680): Submit string: submit:trigger=0,bugtype=2,modulename=com.wangchao.news,level=1,testtype=NORMAL,path=/data/log/unzip/H60-L02\_V100R001CHNC00B316\_DU2TAN148M015230\_20160329214613\_crash  
03-29 21:46:13.089: E/PackageLogInfoManager(20680): checkPackageLogState, cr: android.app.ContextImpl$ApplicationContentResolver@424ca078, packageNames: null

这个错误是在我用ListView展示数据时发生的。我仔细查看代码后发现，原来是Adapter初始化convertView那个地方出错了。

错误代码如下：

import java.util.List;  
  
  
import com.lidroid.xutils.ViewUtils;  
import com.lidroid.xutils.view.annotation.ViewInject;  
import com.wangchao.news.R;  
  
  
import android.content.Context;  
import android.view.View;  
import android.view.ViewGroup;  
import android.widget.BaseAdapter;  
import android.widget.ImageView;  
import android.widget.TextView;  
  
  
public class MenuAdapter extends BaseAdapter \{  
  
  
private Context context;  
private List<String> menuList;  
private int resource;  
  
public MenuAdapter(Context context,List<String> menuList,int resource)\{  
this.context = context;  
this.menuList = menuList;  
this.resource = resource;  
\}  
  
@Override  
public int getCount() \{  
return menuList.size();  
\}  
  
  
@Override  
public Object getItem(int position) \{  
return menuList.get(position);  
\}  
  
  
@Override  
public long getItemId(int position) \{  
return position;  
\}  
  
  
@SuppressWarnings("null")  
@Override  
public View getView(int position, View convertView, ViewGroup parent) \{  
ViewHolder holder = null;  
if(convertView == null)\{  
holder = new ViewHolder();  
View view= View.inflate(context, resource, null);  
ViewUtils.inject(holder, view);  
convertView.setTag(holder);  
\}else\{  
holder = (ViewHolder)convertView.getTag();  
\}  
  
  
holder.menuListTV.setText(menuList.get(position));  
  
return convertView;  
\}  
  
  
public class ViewHolder\{  
@ViewInject(R.id.menu\_listIV)  
ImageView menuListIV;  
@ViewInject(R.id.menu\_listTV)  
TextView menuListTV;  
\}  
\}

以上代码带下划线且红色字体部分为原因所在。\[View.inflate(context, resource, null);\]应该直接赋值给convertView。且ViewUtils.inject(holder, view);应改为ViewUtils.inject(holder, convertView);

修改后的getView方法：

@Override  
public View getView(int position, View convertView, ViewGroup parent) \{  
ViewHolder holder = null;  
if(convertView == null)\{  
holder = new ViewHolder();  
convertView = View.inflate(context, resource, null);  
ViewUtils.inject(holder, convertView);  
convertView.setTag(holder);  
\}else\{  
holder = (ViewHolder)convertView.getTag();  
\}  
  
  
holder.menuListTV.setText(menuList.get(position));  
  
return convertView;  
\}

这样就能正常显示数据了。

另外，使用Gson框架解析Json数据时，如果bean文件中的变量名的大小写与Json中字段的大小写不一致时，也会出现这个错误。

例如：Json数据为

\{  
    "Data": \[  
        \{  
            "BV": 0,  
            "Count": 0,  
            "Deleted": 0,  
            "ID": 143,  
            "MemberPrice": 500,  
            "Money": 0,  
            "Point": 0,  
            "ProductCharFlag": "4",  
            "ProductName": "沙朗大師鍋具清潔粉2瓶",  
            "ProductNumber": "TLF207",  
            "ProductState": 0,  
            "ProductType": 4,  
            "ProductTypeName": "沙朗大師 锅具系列",  
            "RetailPrice": 600,  
            "StatusName": "正常",  
            "ThisTypeCount": 10  
        \},  
        \{  
            "BV": 0,  
            "Count": 0,  
            "Deleted": 0,  
            "ID": 144,  
            "MemberPrice": 11250,  
            "Money": 0,  
            "Point": 1290,  
            "ProductCharFlag": "4",  
            "ProductName": "沙朗大師食物處理機",  
            "ProductNumber": "TLF208",  
            "ProductState": 0,  
            "ProductType": 4,  
            "ProductTypeName": "沙朗大師 锅具系列",  
            "RetailPrice": 12500,  
            "StatusName": "正常",  
            "ThisTypeCount": 10  
        \},  
        \{  
            "BV": 0,  
            "Count": 0,  
            "Deleted": 0,  
            "ID": 145,  
            "MemberPrice": 17820,  
            "Money": 0,  
            "Point": 2050,  
            "ProductCharFlag": "4",  
            "ProductName": "沙朗大師5夸脫小炒鍋",  
            "ProductNumber": "TLF209",  
            "ProductState": 0,  
            "ProductType": 4,  
            "ProductTypeName": "沙朗大師 锅具系列",  
            "RetailPrice": 19800,  
            "StatusName": "正常",  
            "ThisTypeCount": 10  
        \}  
    \],  
    "ModifyDate": "2016-3-14"  
\}

则其相对应的bean文件就应该定义为：

public class NewsCategory \{  
  
  
public List<Category> Data;  
public String ModifyDate;  
  
public static class Category\{  
public String BV;  
public String Count;  
public String Deleted;  
public String ID;  
public String MemberPrice;  
public String Money;  
public String Point;  
public String ProductCharFlag;  
public String ProductName;  
public String ProductNumber;  
public String ProductState;  
public String ProductType;  
public String ProductTypeName;  
public String RetailPrice;  
public String StatusName;  
public String ThisTypeCount;  
\}  
\}