我正在创建一个GridView来显示数据库中的数据。连接和显示工作完美。当我在While循环中引入和If Else语句时，我的问题就出现了。下面是我的XML文件（分别是GridView和CustomGridview）：
<GridView
android:id="@+id/gridView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:stretchMode="columnWidth">
</GridView>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:layout_marginLeft="5dp"
android:text="ID:"
android:textStyle="bold" />
<TextView
android:id="@+id/ID"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:text="ID"
android:layout_marginLeft="5dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:layout_marginLeft="30dp"
android:text="Company Name:"
android:textStyle="bold" />
<TextView
android:id="@+id/Client"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="CompanyName"
android:layout_marginTop="20dp"
android:layout_marginLeft="45dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:layout_marginLeft="145dp"
android:text="Emplyee Name:"
android:textStyle="bold" />
<TextView
android:id="@+id/Employee"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="EmployeeName"
android:layout_marginTop="20dp"
android:layout_marginLeft="145dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="35dp"
android:layout_marginLeft="255dp"
android:textStyle="bold"
android:id="@+id/amountname"
android:text="Amount" />
<TextView
android:id="@+id/Amount"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Amount"
android:layout_marginTop="50dp"
android:layout_marginLeft="255dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="35dp"
android:layout_marginLeft="105dp"
android:text="Reason:"
android:textStyle="bold" />
<TextView
android:id="@+id/Reason"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Reason"
android:layout_marginTop="50dp"
android:layout_marginLeft="105dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="35dp"
android:layout_marginLeft="5dp"
android:text="Receipt Date:"
android:textStyle="bold" />
<TextView
android:id="@+id/ReceiptDate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="ReceiptDate"
android:layout_marginTop="50dp"
android:layout_marginLeft="5dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:layout_marginLeft="255dp"
android:text="Category:"
android:textStyle="bold" />
<TextView
android:id="@+id/Category"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Catergory"
android:layout_marginTop="20dp"
android:layout_marginLeft="255dp" />
布局分别如下所示; gridView
这是我的主要代码：
GridView gridView;
TextView amountno,amountname;
String un, passwords, db, ip;
Connection connect;
ResultSet rs;
@SuppressLint("SetTextI18n")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view_data);
ip = "xxx";
un = "xxx";
passwords = "xxx";
db = "xxx";
amountname = (TextView)findViewById(R.id.amountname);
gridView = (GridView) findViewById(R.id.gridView);
CallableStatement callableStatement=null;
amountno=(TextView)findViewById(R.id.Amount);
try{
connect = CONN(un, passwords, db, ip);
String StoredProc = "{call xxx";
callableStatement=connect.prepareCall(StoredProc);
callableStatement.setString(1, MainActivity.usernam);
rs = callableStatement.executeQuery();
List<Map<String,String>> data = new ArrayList<Map<String,String>>();
String eamount="";
while(rs.next()){
Map<String,String> datanum = new HashMap<String, String>();
datanum.put("A", rs.getString("Id"));
datanum.put("B", rs.getString("Client"));
datanum.put("C", rs.getString("Employee"));
if (rs.getString("Amount")=="0.0000"){
eamount=rs.getString("Received");
}else{
eamount=rs.getString("Amount");
}
datanum.put("E", eamount);
datanum.put("F", rs.getString("Reason"));
datanum.put("H", rs.getString("Date"));
datanum.put("K", rs.getString("Category"));
data.add(datanum);
}
String[] from = {"A","B","C","K","H","F","E"};
Log.d("String Value", String.valueOf(amountname));
int[] views = {R.id.ID, R.id.Client, R.id.Employee,R.id.Category,R.id.ReceiptDate,R.id.Reason,R.id.Amount};
Log.d("String Value", String.valueOf(amountname));
final SimpleAdapter ADA = new SimpleAdapter(ViewData.this,data,R.layout.customgrid, from, views);
gridView.setAdapter(ADA);
if(eamount == "Received"){amountname.setText("Received");Log.d("String Value", eamount);}
else if(eamount == "Amount") {amountname.setText("Expenses");Log.d("String Value", eamount);}
}
catch (SQLException e){
e.printStackTrace();
}
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
}
@SuppressLint("NewApi")
private Connection CONN(String _user, String _pass, String _DB,
String _server) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
.permitAll().build();
StrictMode.setThreadPolicy(policy);
Connection conn = null;
String ConnURL;
try {
Class.forName("net.sourceforge.jtds.jdbc.Driver");
ConnURL = "jdbc:jtds:sqlserver://" + _server + ";" + "databaseName=" + _DB + ";user=" + _user + ";password=" + _pass + ";";
conn = DriverManager.getConnection(ConnURL);
} catch (Exception e) {
Log.e("ERRO", e.getMessage());
}
return conn;
}
现在......如果您在我的自定义网格布局中看到我将textview作为 Amount 标签，并且它具有来自下面数据库的相应值，并且主活动中的IF ELSE语句更改了值（完美工作）....根据从数据库收到的值（＆＃34;接收或金额＆＃34;），我想要改变的是金额标签 ...我想要将标签更改为已收到或相应的费用。
我实际上尝试了很多方法，很多时候它在AmountLabel上显示NULL Point Exception错误，我意识到gridview的标题应该是唯一的，因此我不知道如何动态使用金额（AmountLabel下面的textview）接收的值更改金额标签。
注意：我的代码中没有错误...我只想根据amountValue接收的值动态设置AmText的AmTeLabel。 谢谢你^ _ ^