我制作了一个带有两个编辑文本的 Android SQLDatabase。一个保存姓名，另一个保存一些号码。这是我的 Activity
public class AccountActivity extends ActionBarActivity {
int from_Where_I_Am_Coming = 0;
private DBHelper mydb ;
TextView name ;
TextView amount;
int id_To_Update = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_account);
name = (TextView) findViewById(R.id.input_name);
amount = (TextView) findViewById(R.id.input_amount);
mydb = new DBHelper(this);
Bundle extras = getIntent().getExtras();
if(extras !=null) {
int Value = extras.getInt("id");
if (Value > 0) {
//means this is the view part not the add contact part.
Cursor rs = mydb.getData(Value);
id_To_Update = Value;
rs.moveToFirst();
String nam = rs.getString(rs.getColumnIndex(DBHelper.ACCOUNT_COLUMN_NAME));
String amo = rs.getString(rs.getColumnIndex(DBHelper.ACCOUNT_COLUMN_AMOUNT));
if (!rs.isClosed()) {
rs.close();
}
Button b = (Button) findViewById(R.id.btn_save);
b.setVisibility(View.INVISIBLE);
name.setText((CharSequence) nam);
name.setFocusable(false);
name.setClickable(false);
amount.setText((CharSequence) amo);
amount.setFocusable(false);
amount.setClickable(false);
}
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
Bundle extras = getIntent().getExtras();
if(extras !=null)
{
int Value = extras.getInt("id");
if(Value>0){
getMenuInflater().inflate(R.menu.menu_account, menu);
}
else{
getMenuInflater().inflate(R.menu.menu_main, menu);
}
}
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
switch(item.getItemId())
{
case R.id.Edit_Contact:
Button b = (Button)findViewById(R.id.btn_save);
b.setVisibility(View.VISIBLE);
name.setEnabled(true);
name.setFocusableInTouchMode(true);
name.setClickable(true);
amount.setEnabled(true);
amount.setFocusableInTouchMode(true);
amount.setClickable(true);
return true;
case R.id.Delete_Contact:
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(R.string.deleteAccount)
.setPositiveButton(R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
mydb.deleteAccount(id_To_Update);
Toast.makeText(getApplicationContext(), "Deleted Successfully", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(getApplicationContext(),com.tubapps.accountdb.MainActivity.class);
startActivity(intent);
}
})
.setNegativeButton(R.string.no, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// User cancelled the dialog
}
});
AlertDialog d = builder.create();
d.setTitle("Are you sure");
d.show();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
public void run(View view)
{
Bundle extras = getIntent().getExtras();
if(extras !=null)
{
int Value = extras.getInt("id");
if(Value>0){
if(mydb.updateAccount(id_To_Update, name.getText().toString(), amount.getText().length())){
Intent intent = new Intent(getApplicationContext(),com.tubapps.accountdb.MainActivity.class);
startActivity(intent);
}
else{
Toast.makeText(getApplicationContext(), "not Updated", Toast.LENGTH_SHORT).show();
}
}
else{
if(mydb.insertAccount(name.getText().toString(), amount.getText().length())){
}
else{
}
Intent intent = new Intent(getApplicationContext(),com.tubapps.accountdb.MainActivity.class);
startActivity(intent);
}
}
}
}
这是我的 xml。
<RelativeLayout 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="#E0EEEE"
tools:context="com.tubapps.accountdb.AccountActivity">
<EditText
android:id="@+id/input_name"
android:layout_width="fill_parent"
android:inputType="text"
android:layout_height="wrap_content"
android:hint="@string/account_name"
android:layout_marginLeft="8dip"
android:layout_marginRight="8dip" />
<EditText
android:id="@+id/input_amount"
android:layout_width="fill_parent"
android:inputType="numberSigned"
android:layout_height="wrap_content"
android:hint="@string/initial_value"
android:layout_below="@+id/input_name"
android:layout_marginLeft="8dip"
android:layout_marginRight="8dip" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:adjustViewBounds="true"
android:orientation="horizontal"
android:showDividers="middle">
<Button
android:id="@+id/btn_cnc"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#FFFFFF"
android:clickable="true"
android:focusable="true"
android:text="@string/cancel" />
<Button
android:id="@+id/btn_save"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="run"
android:background="#FFFFFF"
android:text="@string/save_income" />
</LinearLayout>
</RelativeLayout>
这是我的 DBHelper。
public class DBHelper extends SQLiteOpenHelper {
public static final String DATABASE_NAME = "MyDBName.db";
public static final String ACCOUNT_TABLE_NAME = "accounts";
public static final String ACCOUNT_COLUMN_ID = "id";
public static final String ACCOUNT_COLUMN_NAME = "name";
public static final String ACCOUNT_COLUMN_AMOUNT = "amount";
private HashMap hp;
public DBHelper(Context context)
{
super(context, DATABASE_NAME , null, 1);
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL(
"create table accounts " +
"(id integer primary key, name text,amount integer)"
);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS accounts");
onCreate(db);
}
public boolean insertAccount (String name, Integer amount)
{
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put("name", name);
contentValues.put("amount", amount);
db.insert("accounts", null, contentValues);
return true;
}
public Cursor getData(int id){
SQLiteDatabase db = this.getReadableDatabase();
Cursor res = db.rawQuery( "select * from accounts where id="+id+"", null );
return res;
}
public int numberOfRows(){
SQLiteDatabase db = this.getReadableDatabase();
int numRows = (int) DatabaseUtils.queryNumEntries(db, ACCOUNT_TABLE_NAME);
return numRows;
}
public boolean updateAccount (Integer id, String name, Integer amount)
{
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put("name", name);
contentValues.put("amount", amount);
db.update("accounts", contentValues, "id = ? ", new String[] { Integer.toString(id) } );
return true;
}
public Integer deleteAccount (Integer id)
{
SQLiteDatabase db = this.getWritableDatabase();
return db.delete("accounts",
"id = ? ",
new String[] { Integer.toString(id) });
}
public ArrayList getAllAccounts()
{
ArrayList array_list = new ArrayList();
//hp = new HashMap();
SQLiteDatabase db = this.getReadableDatabase();
Cursor res = db.rawQuery( "select * from accounts", null );
res.moveToFirst();
while(res.isAfterLast() == false){
array_list.add(res.getString(res.getColumnIndex(ACCOUNT_COLUMN_NAME)));
res.moveToNext();
}
return array_list;
}
}
当我插入数字时，它只保存数字 3。我不知道问题出在哪里。
最佳答案
您得到的是数字的“长度”，而不是这些行上的值:
amount.getText().length()
我怀疑你应该这样做:
Integer.valueOf(amount.getText())
关于java - Android 数据库 EditText NumberSigned，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/28344718/