有没有办法读取 sqlite 表中的所有行并在文本视图中立即显示它们?
这就是我阅读它们的方式,它逐行阅读......
//---retrieves all the titles---
public Cursor getAllTitles()
{
return db.query(DATABASE_TABLE, new String[] {
KEY_ROWID,
KEY_ISBN,
KEY_TITLE,
KEY_PUBLISHER},
null,
null,
null,
null,
null);
import android.app.Activity;
import android.database.Cursor;
import android.os.Bundle;
import android.widget.Toast;
public class DatabaseActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
DBAdapter db = new DBAdapter(this);
//---get all titles---
db.open();
Cursor c = db.getAllTitles();
if (c.moveToFirst())
{
do {
DisplayTitle(c);
} while (c.moveToNext());
}
db.close();
}
}
public void DisplayTitle(Cursor c)
{
Toast.makeText(this,
"id: " + c.getString(0) + "\n" +
"ISBN: " + c.getString(1) + "\n" +
"TITLE: " + c.getString(2) + "\n" +
"PUBLISHER: " + c.getString(3),
Toast.LENGTH_LONG).show();
}
首先,您可能希望研究列表视图以轻松显示这样的数据列表。
如果您的目标确实是在一个文本视图(或您现在正在制作的吐司)中显示所有信息,您可以尝试制作一个大字符串,用它来创建吐司:
//---get all titles---
db.open();
Cursor c = db.getAllTitles();
String text = "";
if (c.moveToFirst())
{
do {
DisplayTitle(c, text);
} while (c.moveToNext());
}
db.close();
Toast.makeText(this, text, Toast.LENGTH_LONG).show();
}
public void DisplayTitle(Cursor c, String text)
{
text +=
"id: " + c.getString(0) + "\n" +
"ISBN: " + c.getString(1) + "\n" +
"TITLE: " + c.getString(2) + "\n" +
"PUBLISHER: " + c.getString(3);
}
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