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我創建了一個函數,用於更新我需要在多個視圖上使用的數據庫中的某些值。現在每個類都有自己的代碼副本。基本上我讀了值,然後想更新文本視圖。如何從另一個類調用引用(TextView)findViewById
我爲DisplayTop做了一個類,它完成了這項工作,並且它在本地非常棒。但不知何故,我需要通過我認爲的函數發送(TextView)findViewById。我希望我說得對。那麼對此的調用以及如何解決(TextView)findViewById。謝謝你的幫助!
public void DisplayTop2()
{
int UserID = 1;
String D=Fun.getCurrentDateString();
String Sql;
Double a = 0.0;
Double b = 0.0;
SQLiteDatabase Db;
String myPath = DB_PATH + DB_NAME;
Db = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
Sql =" SELECT a,b " +
" FROM test " +
" where Dte = '" + D + "' and UserID = " + UserID;
try {
Cursor c = Db.rawQuery(Sql, null);
if (c != null) {
if (c.moveToFirst()) {
do {
a += (c.getDouble(c.getColumnIndex("a")));
b += (c.getDouble(c.getColumnIndex("b")));
}while (c.moveToNext());
}
}
c.close();
} catch (Exception e) {
}
Db.close();
// Here is where the problem is. The real app has 5 fields.
// I can pass the R.id.a
// But how do I pass the reference to findViewById to the activity that called this
TextView tvt4 = (TextView)findViewById(R.id.a);
D = Fun.round(a,1,BigDecimal.ROUND_HALF_UP);
tvt4.setText(D) ;
tvt4 = (TextView)findViewById(R.id.b);
D = Fun.round(b,1,BigDecimal.ROUND_HALF_UP);
tvt4.setText(D) ;
};
另一個騙子的方法是從活動中傳遞上下文,但是你的解決方案要乾淨得多。 – sgarman 2011-01-12 16:30:22