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我创建了一个 android 应用程序，它使用 editText 字段获取一些数据，例如姓名、联系人、一个单选组按钮、两个用于保存和查看存储数据的按钮以及一个微调器，并在按下保存按钮时将这些信息存储在数据库中。按下查看按钮时，数据显示在屏幕底部。通常微调器默认显示值 18。一切都很好，当我打开应用程序并在输入字段后按保存按钮时，当查看按钮是显示按下的数据，但我无法通过打开应用程序一次来插入更多数据，因为微调器的内容现在被隐藏了。为此，我需要关闭应用程序，然后再次打开它。如何克服这个问题。任何人请运行代码，看看有什么问题

.xml 文件：

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >

<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >

    <TextView
        android:id="@+id/textContcat"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:paddingLeft="5dp"
        android:text="@string/name"
        android:textSize="20sp" />

    <EditText
        android:id="@+id/editName"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:ems="10"
        android:hint="@string/namehint"
        android:inputType="textPersonName"
        android:paddingRight="5dp"
        android:textSize="20sp" >

        <requestFocus />
    </EditText>
</LinearLayout>

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >

    <TextView
        android:id="@+id/textAge"
        android:layout_width="wrap_content"
        android:layout_height="37dp"
        android:gravity="center"
        android:paddingLeft="5dp"
        android:paddingRight="20dp"
        android:text="@string/age"
        android:textSize="20sp" />

    <Spinner
        android:id="@+id/spAge"
        android:layout_width="80dp"
        android:layout_height="match_parent"
        android:layout_weight="0.00"
        android:clickable="true"
        android:gravity="top|center"
        android:paddingRight="20dp"
        android:textSize="20sp" />
</LinearLayout>

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >

    <TextView
        android:id="@+id/textContcat"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:paddingLeft="5dp"
        android:text="@string/contact"
        android:textSize="20sp" />

    <EditText
        android:id="@+id/editContact"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:ems="10"
        android:hint="@string/contacthint"
        android:inputType="number"
        android:paddingRight="5dp"
        android:textSize="20sp" />
</LinearLayout>

<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="0dp"
    android:orientation="horizontal" >

    <TextView
        android:id="@+id/sLabel"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:gravity="left|center"
        android:paddingLeft="5dp"
        android:paddingRight="10dp"
        android:text="@string/sx"
        android:textSize="20sp" />

    <RadioGroup
        android:id="@+id/RadioGroup01"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <RadioButton
            android:id="@+id/malebutton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:checked="true"
            android:text="@string/mal"
            android:textSize="20sp" />

        <RadioButton
            android:id="@+id/femalebutton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/femal"
            android:textSize="20sp" />
    </RadioGroup>
</LinearLayout>

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal" >

    <Button
        android:id="@+id/savebutton"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="80dp"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="@string/save"
        android:textSize="20sp" />

    <Button
        android:id="@+id/viewbutton"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="80dp"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:gravity="center"
        android:text="@string/view"
        android:textSize="20sp" />
</LinearLayout>

<View
    android:layout_width="fill_parent"
    android:layout_height="1dp"
    android:background="@android:color/darker_gray" />

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <TableLayout
        android:id="@+id/tableLayout1"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >

        <TableRow>
        </TableRow>
    </TableLayout>

    <View
        android:layout_width="fill_parent"
        android:layout_height="1dp"
        android:background="@android:color/darker_gray" />

    <TextView
        android:id="@+id/tvSQLinfo"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_weight="1"
        android:padding="5dp"
        android:text="@string/nullvalue"
        android:textColor="@color/text_color"
        android:textSize="20sp" >
    </TextView>
</LinearLayout>

.java 文件：

public class SqlLiteExample extends Activity implements OnClickListener,
OnItemSelectedListener {
Button sqlUpdate, sqlView;
EditText etName, etContact;
RadioGroup myRadioGrp;
RadioButton rbtn1, rbtn2;
Spinner sp;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.sqlliteexample);
sqlUpdate = (Button) findViewById(R.id.savebutton);
etName = (EditText) findViewById(R.id.editName);
etContact = (EditText) findViewById(R.id.editContact);
rbtn1 = (RadioButton) findViewById(R.id.malebutton);
rbtn2 = (RadioButton) findViewById(R.id.femalebutton);
sqlView = (Button) findViewById(R.id.viewbutton);
sqlView.setOnClickListener(this);
sqlUpdate.setOnClickListener(this);

uI();
spElements();

}

private void spElements() {
// TODO Auto-generated method stub
List<String> ages = new ArrayList<String>();
for (int i = 18; i <= 99; i++) {
    ages.add(String.valueOf(i));
}
// Creating adapter for spinner
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
        android.R.layout.simple_spinner_item, ages);
// Drop down layout style - list view with radio button
dataAdapter
        .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// attaching data adapter to spinner
sp.setAdapter(dataAdapter);
}

private void uI() {
// TODO Auto-generated method stub
sp = (Spinner) findViewById(R.id.spAge);
sp.setOnItemSelectedListener(this);
}

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
switch (arg0.getId()) {
case R.id.savebutton:
    boolean didWork = true;
    try {
        String name = etName.getText().toString();
        String age = (String) sp.getSelectedItem();
        String contact = etContact.getText().toString();

        myRadioGrp = (RadioGroup) findViewById(R.id.RadioGroup01);
        String sex = ((RadioButton) this.findViewById(myRadioGrp
                .getCheckedRadioButtonId())).getText().toString();

        MyDB entry = new MyDB(SqlLiteExample.this);
        entry.open();
        entry.createEntry(name, age, contact, sex);
        entry.close();
    } catch (Exception e) {
        didWork = false;
        String error = e.toString();
        Dialog d = new Dialog(this);
        d.setTitle("Error");
        TextView tv = new TextView(this);
        tv.setText(error);
        d.setContentView(tv);
        d.show();
    } finally {
        if (didWork) {
            Dialog d = new Dialog(this);
            d.setTitle("Updated");
            TextView tv = new TextView(this);
            tv.setText("Succesfully");
            d.setContentView(tv);
            d.show();
        }
    }
    break;
case R.id.viewbutton:
    Intent i = new Intent("com.bysakiralam.mydatabase.DISPLAYRECORDS");
    startActivity(i);
    break;
}
}

@Override
public void onItemSelected(AdapterView<?> main, View arg1, int position,
    long Id) {
// TODO Auto-generated method stub

}

@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub

}
}

Displayrecords.java :

public class DisplayRecords extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.sqlliteexample);
    TextView tv = (TextView) findViewById(R.id.tvSQLinfo);
    MyDB info = new MyDB(this);

    try {
        info.open();
    } catch (SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    String data = info.getData();
    info.close();
    tv.setText(data);
}

}

MyDB.java：

public class MyDB {
public static final String KEY_ROWID = "_id";
public static final String KEY_NAME = "persons_name";
public static final String KEY_AGE = "persons_age";
public static final String KEY_CONTACT = "persons_contact";
public static final String KEY_SEX = "gender";

private static final String DATABASE_NAME = "MyDatabase";
private static final String DATABASE_TABLE = "peopleTable";
private static final int DATABASE_VERSION = 1;

private DbHelper ourHelper;
private final Context ourContext;
private SQLiteDatabase ourDatabase;

private static class DbHelper extends SQLiteOpenHelper {

    public DbHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
        // TODO Auto-generated constructor stub
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub
        db.execSQL("CREATE TABLE " + DATABASE_TABLE + " (" + KEY_ROWID
                + " INTEGER PRIMARY KEY AUTOINCREMENT, " + KEY_NAME
                + " TEXT NOT NULL, " + KEY_AGE + " TEXT NOT NULL, "
                + KEY_CONTACT + " TEXT NOT NULL, " + KEY_SEX
                + " TEXT NOT NULL)");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub
        db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE);
        onCreate(db);
    }
}

public MyDB(Context c) {
    ourContext = c;
}

public MyDB open() throws SQLException {
    ourHelper = new DbHelper(ourContext);
    ourDatabase = ourHelper.getWritableDatabase();
    return this;
}

public void close() {
    ourHelper.close();
}

public long createEntry(String name, String age, String contact, String sex) {
    // TODO Auto-generated method stub
    ContentValues cv = new ContentValues();
    cv.put(KEY_NAME, name);
    cv.put(KEY_AGE, age);
    cv.put(KEY_CONTACT, contact);
    cv.put(KEY_SEX, sex);
    return ourDatabase.insert(DATABASE_TABLE, null, cv);
}

public String getData() {
    // TODO Auto-generated method stub
    String[] columns = new String[] { KEY_ROWID, KEY_NAME, KEY_AGE,
            KEY_CONTACT, KEY_SEX };
    Cursor c = ourDatabase.query(DATABASE_TABLE, columns, null, null, null,
            null, null);
    String result = "";

    int iRow = c.getColumnIndex(KEY_ROWID);
    int iName = c.getColumnIndex(KEY_NAME);
    int iAGE = c.getColumnIndex(KEY_AGE);
    int iCONTACT = c.getColumnIndex(KEY_CONTACT);
    int iSEX = c.getColumnIndex(KEY_SEX);

    for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) {
        result = result + c.getString(iRow) + "\t\t" + c.getString(iName)
                + "\t" + c.getString(iAGE) + "\t\t" + c.getString(iCONTACT)
                + "\t" + c.getString(iSEX) + "\n";
    }
    return result;
}
}
4

1 回答 1

0

保存或查看条目后，也许您必须重置微调器？（也许在保存/查看按钮的 onClick 方法中）此外，xml 文件似乎也不正确，因为您在 ScrollView 中有一个线性布局。

于 2013-07-12T10:41:38.090 回答