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感謝您的時間閱讀我的問題。Android:獲取捆綁字符串來創建sqlite數據庫表
我打算編寫一個應用程序,允許用戶選擇表列來執行全文搜索。因此,我將用戶輸入轉換爲捆綁字符串,並嘗試將其傳入SQLiteOpenHelper。但是,SQLOpenHelper無法獲取字符串。我的代碼片段如下:
ActivityA.java
public class ActivityA extends Activity {
...
//get the selected dropdown list value
public void addListenerOnButton(final Spinner sp1, final Spinner sp2, final MultiSpinner msp1, final MultiSpinner msp2) {
btnSubmit = (Button) findViewById(R.id.btnSubmit);
btnSubmit.setOnClickListener(new OnClickListener() {
//@Override
public void onClick(View v) {
strpkey = String.valueOf(sp1.getSelectedItem());
strskey = String.valueOf(sp2.getSelectedItem());
stronscreen = String.valueOf(msp1.getSelectedItem());
strwhenclick = String.valueOf(msp2.getSelectedItem());
Intent intent = new Intent();
intent.setClass(ActivityA.this, ActivityB.class);
Bundle bundle = new Bundle();
bundle.putString("Pkey", strpkey);
bundle.putString("Skey", strskey);
bundle.putString("Onscreen", stronscreen);
bundle.putString("Whenclick", strwhenclick);
intent.putExtras(bundle);
startActivity(intent);
}
注:我能夠獲得ActivityB捆繩子,讓我不認爲問題出在ActivityA。
ActivityB.java
public class ActivityB extends Activity {
public String strpkey, strskey;
public String stronscreen;
private DbAdapter dbHelper;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.countsheet);
strpkey = getfilepath("Pkey");
strskey = getfilepath("Skey");
stronscreen = getfilepath("Onscreen");
Toast.makeText(this, strpkey + " " + strskey + " " + stronscreen, Toast.LENGTH_LONG).show();
dbHelper = new DbAdapter(this);
dbHelper.open();
public String getfilepath(String strbundletext) {
Bundle bundle = this.getIntent().getExtras();
String csvpath = bundle.getString(strbundletext);
return csvpath;
}
...
}
DBAdapter.java
import com.ksgrp.stocktake.ActivityB;
public class DbAdapter {
public static class DatabaseHelper extends SQLiteOpenHelper {
public ListDesign csobj2 = new ListDesign();
public String pkey = csobj2.strpkey;
private String skey = csobj2.strskey;
public String onscreen = csobj2.stronscreen;
private String getstr(String pkey, String skey) {
ActivityB csobj = new ActivityB();
String pkey = csobj.strpkey;
String skey = csobj.strskey;
String onscreen = csobj.stronscreen;
String sqlstr = "CREATE VIRTUAL TABLE " + vdb_tbl + " USING fts3(" + sqlstr + ")";
return sqlstr;
}
//@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
String strsql = getstr(this.pkey, this.skey);
db.execSQL("DROP TABLE IF EXISTS " + vdb_tbl);
db.execSQL(strsql);
Log.w("TAG", strsql);
}
}
我得到一個Java空指針異常,當我在ActivityA點擊按鈕:
03-08 14:04:31.569: E/AndroidRuntime(29573): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.ksgrp.stocktake/com.ksgrp.stocktake.ActivityB}: android.database.sqlite.SQLiteException: vtable constructor failed: stocklist2: CREATE VIRTUAL TABLE stocklist2 USING fts3(null, null)
我相信我是無法得到的值將字符串綁定到DBAdapter類中。任何人都可以幫我一下嗎?我可以提供完整的代碼(但它很冗長,所以我剛剛提取了上面的相關位)。
我記得有同樣的問題,你可以改變這些語句intent.putExtra(「p鍵」,strpkey); intent.putString(「Skey」,strskey); intent.putString(「Onscreen」,stronscreen); intent.putString(「Whenclick」,strwhenclick); – kosa 2012-03-08 17:01:48
感謝您的回覆。然而,我不認爲問題在於intent.putExtra語句,因爲我能夠顯示Toast,如果我註釋掉數據庫語句 – kwytse 2012-03-08 17:23:38
我想我看到了什麼錯誤String sqlstr =「CREATE VIRTUAL TABLE」+ vdb_tbl + 「使用fts3(」+ sqlstr +「)」,你傳遞sqlStr作爲字段,這是錯誤的。您需要傳遞您獲取的列作爲參數。看到這個鏈接http://blog.andresteingress.com/2011/09/30/android-quick-tip-using-sqlite-fts-tables/ – kosa 2012-03-08 17:26:28