我的 android 应用程序有问题。对于我的程序:我有一个包含许多活动的应用程序,我使用 ListView 和 SQLite 数据库。如果我单击 ListView 中的一个值,我将使用该值启动另一个 Activity。如果下一个活动开始,我会收到错误消息。
LogCat 说:找不到源
这是我的代码:
public class ShowDayActivity extends ListActivity {
private SQLiteDatabase mDatenbank;
private DatenbankManager mHelper; //My Helpclass
private static String KLASSEN_SELECT_ROW;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_show_day);
Intent intent = getIntent();
((TextView)(findViewById(R.id.schultag))).setText(intent.getStringExtra("iteid"));
String Tablename = ((TextView)findViewById(R.id.schultag)).getText().toString();
mHelper = new DatenbankManager(this);
mHelper.SQL_SELECT = "SELECT name FROM "+Tablename+"";
mHelper.SQL_CREATE = "CREATE TABLE "+Tablename+"(" +
"_id INTEGER PRIMARY KEY AUTOINCREMENT, " +
"name TEXT NOT NULL, " +
"info TEXT)";
}
@Override
protected void onPause() {
super.onPause();
mDatenbank.close();
Toast.makeText(this,
getResources().getString(R.string.db_close),
Toast.LENGTH_SHORT).show();
}
@Override
protected void onResume() {
super.onResume();
mDatenbank = mHelper.getReadableDatabase();
Toast.makeText(this,
getResources().getString(R.string.db_open),
Toast.LENGTH_SHORT).show();
ladeDaten();
}
public void addNew(View view)
{
EditText et = (EditText)findViewById(R.id.fach_name);
ContentValues werte = new ContentValues();
werte.put("name",et.getText().toString());
String tbname = mHelper.TBNAME;
mDatenbank.insert(tbname, null, werte);
Toast.makeText(this,
getResources().getString(R.string.add),
Toast.LENGTH_SHORT).show();
ladeDaten();
et.setText("");
}
private void ladeDaten() {
String tbname = mHelper.TBNAME;
KLASSEN_SELECT_ROW = "SELECT name FROM "+tbname+"";
Cursor KlassenCursor = mDatenbank.rawQuery(KLASSEN_SELECT_ROW, null);
startManagingCursor(KlassenCursor);
android.widget.SimpleCursorAdapter KlassenAdapter = new android.widget.SimpleCursorAdapter(this,
android.R.layout.simple_list_item_1,
KlassenCursor,
new String[] {"name"},
new int[] {
android.R.id.text1
});
setListAdapter(KlassenAdapter);
}
我对此活动的布局:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#111111"
android:baselineAligned="false"
android:orientation="vertical" >
<TextView
android:id="@+id/schultag"
android:layout_width="250dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="10dp"
android:text="@string/schultag_titel"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="#E1E1E1" />
<EditText
android:id="@+id/fach_name"
android:layout_width="250dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="0dp"
android:ems="10"
android:hint="Bitte Fach eingeben" >
<requestFocus />
</EditText>
<Button
android:layout_width="80dp"
android:layout_height="40dp"
android:layout_gravity="center"
android:layout_marginTop="10dp"
android:background="@drawable/btn_default_normal_holo_light"
android:drawableLeft="@drawable/icon_ok"
android:text="@string/plus"
android:onClick="addNew"
></Button>
<TextView
android:id="@+id/textView1"
android:layout_width="250dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="20dp"
android:text="Tag"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="#19630F"
android:textSize="22sp" />
<ListView
android:id="@android:id/android:list"
android:layout_width="250dp"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"
android:layout_height="wrap_content"
android:textColor="#19630F"
android:layout_gravity="center" >
</ListView>
</LinearLayout>