我有 ListView Activity :
public class List extends ActionBarActivity{
private CustomCursorAdapter customAdapter;
private PersonDatabaseHelper databaseHelper;
private static final int ENTER_DATA_REQUEST_CODE = 1;
private ListView listView;
private static final String TAG = List.class.getSimpleName();
/**
* Called when the activity is first created.
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.listview);
databaseHelper = new PersonDatabaseHelper(this);
listView = (ListView) findViewById(R.id.list_data);
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Log.d(TAG, "clicked on item: " + position);
Intent intent = new Intent(List.this, Edit.class);
intent.putExtra("id", position);
startActivity(intent);
}
});
listView.setOnLongClickListener(new OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
return false;
// TODO Auto-generated method stub
}
});
// Database query can be a time consuming task ..
// so its safe to call database query in another thread
// Handler, will handle this stuff for you <img src="http://s0.wp.com/wp-includes/images/smilies/icon_smile.gif?m=1129645325g" alt=":)" class="wp-smiley">
new Handler().post(new Runnable() {
@Override
public void run() {
customAdapter = new CustomCursorAdapter(List.this, databaseHelper.getAllData());
listView.setAdapter(customAdapter);
}
});
}
public void onClickEnterData(View btnAdd) {
startActivityForResult(new Intent(this, Permission.class), ENTER_DATA_REQUEST_CODE);
}
public void onClickLogOut(View btnLogOut){
Intent intent = new Intent(List.this,
MainActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK) {
databaseHelper.insertData(data.getExtras().getString("tag_person_name"), data.getExtras().getString("tag_person_surname"),data.getExtras().getString("tag_person_enterdate"),data.getExtras().getString("tag_person_entertime"),data.getExtras().getString("tag_person_exitdate"),data.getExtras().getString("tag_person_exittime"));
customAdapter.changeCursor(databaseHelper.getAllData());
}
}
}
这是我的 SQL 助手:
public class PersonDatabaseHelper {
private static final String TAG = PersonDatabaseHelper.class.getSimpleName();
// database configuration
// if you want the onUpgrade to run then change the database_version
private static final int DATABASE_VERSION = 7;
private static final String DATABASE_NAME = "database.db";
// table configuration
private static final String TABLE_NAME = "person_table"; // Table name
private static final String PERSON_TABLE_COLUMN_ID = "_id"; // a column named "_id" is required for cursor
private static final String PERSON_TABLE_COLUMN_NAME = "person_name";
private static final String PERSON_TABLE_COLUMN_SURNAME = "person_surname";
private static final String PERSON_TABLE_COLUMN_ENTERDATE = "person_enterdate";
private static final String PERSON_TABLE_COLUMN_ENTERTIME = "person_entertime";
private static final String PERSON_TABLE_COLUMN_EXITDATE = "person_exitdate";
private static final String PERSON_TABLE_COLUMN_EXITTIME = "person_exittime";
private DatabaseOpenHelper openHelper;
private SQLiteDatabase database;
// this is a wrapper class. that means, from outside world, anyone will communicate with PersonDatabaseHelper,
// but under the hood actually DatabaseOpenHelper class will perform database CRUD operations
public PersonDatabaseHelper(Context aContext) {
openHelper = new DatabaseOpenHelper(aContext);
database = openHelper.getWritableDatabase();
}
public void insertData (String aPersonName, String aPersonSurName, String aPersonEnterDate,String aPersonEnterTime, String aPersonExitDate,String aPersonExitTime) {
// we are using ContentValues to avoid sql format errors
ContentValues contentValues = new ContentValues();
contentValues.put(PERSON_TABLE_COLUMN_NAME, aPersonName);
contentValues.put(PERSON_TABLE_COLUMN_SURNAME, aPersonSurName);
contentValues.put(PERSON_TABLE_COLUMN_ENTERDATE, aPersonEnterDate);
contentValues.put(PERSON_TABLE_COLUMN_ENTERTIME, aPersonEnterTime);
contentValues.put(PERSON_TABLE_COLUMN_EXITDATE, aPersonExitDate);
contentValues.put(PERSON_TABLE_COLUMN_EXITTIME, aPersonExitTime);
database.insert(TABLE_NAME, null, contentValues);
}
public Cursor getAllData () {
String buildSQL = "SELECT * FROM " + TABLE_NAME;
Log.d(TAG, "getAllData SQL: " + buildSQL);
return database.rawQuery(buildSQL, null);
}
// this DatabaseOpenHelper class will actually be used to perform database related operation
private class DatabaseOpenHelper extends SQLiteOpenHelper {
public DatabaseOpenHelper(Context aContext) {
super(aContext, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase sqLiteDatabase) {
// Create your tables here
String buildSQL = "CREATE TABLE " + TABLE_NAME + "( " + PERSON_TABLE_COLUMN_ID + " INTEGER PRIMARY KEY, " +
PERSON_TABLE_COLUMN_NAME + " TEXT, " + PERSON_TABLE_COLUMN_SURNAME + " TEXT, " + PERSON_TABLE_COLUMN_ENTERDATE + " TEXT," + PERSON_TABLE_COLUMN_ENTERTIME + " TEXT," + PERSON_TABLE_COLUMN_EXITDATE + " TEXT," + PERSON_TABLE_COLUMN_EXITTIME + " TEXT )";
Log.d(TAG, "onCreate SQL: " + buildSQL);
sqLiteDatabase.execSQL(buildSQL);
}
@Override
public void onUpgrade(SQLiteDatabase sqLiteDatabase, int oldVersion, int newVersion) {
// Database schema upgrade code goes here
String buildSQL = "DROP TABLE IF EXISTS " + TABLE_NAME;
Log.d(TAG, "onUpgrade SQL: " + buildSQL);
sqLiteDatabase.execSQL(buildSQL); // drop previous table
onCreate(sqLiteDatabase); // create the table from the beginning
}
}
}
这是我的自定义适配器类
public class CustomCursorAdapter extends CursorAdapter {
@SuppressWarnings("deprecation")
public CustomCursorAdapter(Context context, Cursor c) {
super(context, c);
}
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
// when the view will be created for first time,
// we need to tell the adapters, how each item will look
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View retView = inflater.inflate(R.layout.single_row_item, parent, false);
return retView;
}
@Override
public void bindView(View view, Context context, Cursor cursor) {
// here we are setting our data
// that means, take the data from the cursor and put it in views
TextView textViewPersonName = (TextView) view.findViewById(R.id.name);
textViewPersonName.setText(cursor.getString(cursor.getColumnIndex(cursor.getColumnName(1))));
TextView textViewPersonsurName = (TextView) view.findViewById(R.id.surName);
textViewPersonsurName.setText(cursor.getString(cursor.getColumnIndex(cursor.getColumnName(2))));
TextView textViewPersonEnterDate = (TextView) view.findViewById(R.id.date);
textViewPersonEnterDate.setText(cursor.getString(cursor.getColumnIndex(cursor.getColumnName(3))));
TextView textViewPersonEnterTime = (TextView) view.findViewById(R.id.time);
textViewPersonEnterTime.setText(cursor.getString(cursor.getColumnIndex(cursor.getColumnName(4))));
TextView textViewPersonExitDate = (TextView) view.findViewById(R.id.date2);
textViewPersonExitDate.setText(cursor.getString(cursor.getColumnIndex(cursor.getColumnName(5))));
TextView textViewPersonExitTime = (TextView) view.findViewById(R.id.time2);
textViewPersonExitTime.setText(cursor.getString(cursor.getColumnIndex(cursor.getColumnName(6))));
}
}
这是我的列表的样子:
然后我点击我创建的列表项:
public class Edit extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_edit);
Bundle extras = getIntent().getExtras();
if(extras !=null)
{
int id = extras.getInt("id");
Toast.makeText(getApplicationContext(),
"Position :"+id , Toast.LENGTH_LONG);
}
EditText name = (EditText) findViewById(R.id.name);
EditText surName = (EditText) findViewById(R.id.surName);
EditText date = (EditText) findViewById(R.id.date2);
EditText time = (EditText) findViewById(R.id.time2);
EditText eDate = (EditText) findViewById(R.id.date3);
EditText eTime = (EditText) findViewById(R.id.time3);
}
public void onCancel(View btnCancel){
Intent intent = new Intent (Edit.this,List.class);
startActivity(intent);
}
public void onSave(View btnSave){
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.edit, 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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
点击之后是这样的:
所以我设法通过单击它来获取列 ID，但主要问题是当我单击列表项时我想制作所有信息都显示在编辑文本字段中(现在它是空的，因为我上传了图像)和单击添加按钮后，它会更新列表中显示的 SQL 表和信息。 List.java 存储我的列表和 Edit.java，其中在 ListView 中单击项目后出现空编辑字段。
编辑:CustomCursorAdapter
public class CustomCursorAdapter extends CursorAdapter {
@SuppressWarnings("deprecation")
public CustomCursorAdapter(Context context, Cursor c) {
super(context, c);
}
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
// when the view will be created for first time,
// we need to tell the adapters, how each item will look
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View retView = inflater.inflate(R.layout.single_row_item, parent, false);
return retView;
}
@Override
public void bindView(View view, Context context, Cursor cursor) {
// here we are setting our data
// that means, take the data from the cursor and put it in views
TextView textViewPersonName = (TextView) view.findViewById(R.id.name);
textViewPersonName.setText(cursor.getString(cursor.getColumnIndex(cursor.getColumnName(1))));
TextView textViewPersonsurName = (TextView) view.findViewById(R.id.surName);
textViewPersonsurName.setText(cursor.getString(cursor.getColumnIndex(cursor.getColumnName(2))));
TextView textViewPersonEnterDate = (TextView) view.findViewById(R.id.date);
textViewPersonEnterDate.setText(cursor.getString(cursor.getColumnIndex(cursor.getColumnName(3))));
TextView textViewPersonEnterTime = (TextView) view.findViewById(R.id.time);
textViewPersonEnterTime.setText(cursor.getString(cursor.getColumnIndex(cursor.getColumnName(4))));
TextView textViewPersonExitDate = (TextView) view.findViewById(R.id.date2);
textViewPersonExitDate.setText(cursor.getString(cursor.getColumnIndex(cursor.getColumnName(5))));
TextView textViewPersonExitTime = (TextView) view.findViewById(R.id.time2);
textViewPersonExitTime.setText(cursor.getString(cursor.getColumnIndex(cursor.getColumnName(6))));
}
public Person get(int position) {
Cursor cursor = getCursor();
Person person;
if(cursor.moveToPosition(position)) {
person = new Person();
person.name = cursor.getString(cursor.getColumnIndex(PERSON_TABLE_COLUMN_NAME));
person.surname = cursor.getString(cursor.getColumnIndex(PERSON_TABLE_COLUMN_SURNAME));
person.enterDate = cursor.getString(cursor.getColumnIndex(PERSON_TABLE_COLUMN_ENTERDATE));
person.enterTime = cursor.getString(cursor.getColumnIndex(PERSON_TABLE_COLUMN_ENTERTIME));
person.exitDate = cursor.getString(cursor.getColumnIndex(PERSON_TABLE_COLUMN_EXITDATE));
person.exitTime = cursor.getString(cursor.getColumnIndex(PERSON_TABLE_COLUMN_EXITTIME));
}
return person;
}
}
编辑 xml:
<EditText
android:id="@+id/username"
android:hint="Name"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</EditText>
<EditText
android:id="@+id/usersurname"
android:hint="Surname"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</EditText>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<EditText
android:id="@+id/date2"
android:hint="Enter date"
android:focusable="false"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</EditText>
<EditText
android:id="@+id/time2"
android:hint="Enter time"
android:focusable="false"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</EditText>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<EditText
android:id="@+id/date3"
android:hint="Exit date"
android:focusable="false"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</EditText>
<EditText
android:id="@+id/time3"
android:hint="Exit time"
android:focusable="false"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</EditText>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<Button
android:id="@+id/Save"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="onClickSave"
android:text="Add" />
<Button
android:id="@+id/Cancel"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="onCancel"
android:text="Cancel" />
</LinearLayout>
</LinearLayout>
编辑3:
public class Edit extends ActionBarActivity {
EditText name;
EditText surName;
EditText date;
EditText time;
EditText eDate;
EditText eTime;
String data_name;
String data_surname;
String data_enterdate;
String data_entertime;
String data_exitdate;
String data_exittime;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_edit);
Intent intent = getIntent();
data_name = intent.getStringExtra("name");
data_surname = intent.getStringExtra("surname");
data_enterdate= intent.getStringExtra("enterdate");
data_entertime = intent.getStringExtra("entertime");
data_exitdate = intent.getStringExtra("exitdate");
data_exittime = intent.getStringExtra("surname");
name = (EditText) findViewById(R.id.name);
surName = (EditText) findViewById(R.id.surName);
date = (EditText) findViewById(R.id.date2);
time = (EditText) findViewById(R.id.time2);
eDate = (EditText) findViewById(R.id.date3);
eTime = (EditText) findViewById(R.id.time3);
setText();
}
public void setText(){
name.setText(data_name,TextView.BufferType.EDITABLE);
surName.setText(data_surname,TextView.BufferType.EDITABLE);
date.setText(data_enterdate,TextView.BufferType.EDITABLE);
time.setText(data_entertime,TextView.BufferType.EDITABLE);
eDate.setText(data_exitdate,TextView.BufferType.EDITABLE);
eTime.setText(data_exittime,TextView.BufferType.EDITABLE);
}
public void onCancel(View btnCancel){
Intent intent = new Intent (Edit.this,List.class);
startActivity(intent);
}
public void onSave(View btnSave){
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.edit, 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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
最佳答案
第一件事。您可以像放置 id 一样放置所有列的 Intent 。例如，如果你想输入名字，那么:
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Log.d(TAG, "clicked on item: " + position);
Intent intent = new Intent(List.this, Edit.class);
//change this to your actual code
String name = listView.getAdapter().getItem(position).getName();
intent.putExtra("id", position);
intent.putExtra("name", name);
//put the rest of the data here
startActivity(intent);
}
});
在您的Edit Activity 中，只需调用:
Intent intent = getIntent();
String data_name = intent.getStringExtra("name");
//get the rest of the data
然后将文本设置为合适的EditText:
name.setText(data_name);
如果您想更新 SQL 表，只需在 DatabaseOpenHelper 中创建一个方法来更新列。如果您不知道如何操作，只需在适用于 Android 的 SQLite 更新语句上执行 Google 搜索。
然后向您的按钮添加一个 onClickListener:
yourAddButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
//get an instance of the DBHelper class and get
the text from the EditTexts to update the table
}
});
编辑:
制作这个Person类
public class Person {
String name;
String surname;
String enterDate;
String enterTime;
String exitDate;
String exitTime;
}
编辑 3:
这应该是处理 CursorAdapter 的正确方法，抱歉，因为我以前没有使用过它。
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Log.d(TAG, "clicked on item: " + position);
Intent intent = new Intent(List.this, Edit.class);
Person p = new Person();
Cursor cursor = (Cursor) customAdapter.getItem(position);
p.name = cursor.getString(cursor.getColumnIndex("person_name"));
p.surname = cursor.getString(cursor.getColumnIndex("person_surname"));
p.enterDate = cursor.getString(cursor.getColumnIndex("person_enterdate"));
p.enterTime = cursor.getString(cursor.getColumnIndex("person_entertime"));
p.exitDate = cursor.getString(cursor.getColumnIndex("person_exitdate"));
p.exitTime = cursor.getString(cursor.getColumnIndex("person_exittime"));
//get the rest of the attributes
intent.putExtra("id", position);
intent.putExtra("name", p.name);
intent.putExtra("surname", p.surname);
//put the rest of the data here
startActivity(intent);
}
});
编辑 4:
public class Edit extends ActionBarActivity {
EditText name;
EditText surName;
EditText date;
EditText time;
EditText eDate;
EditText eTime;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_edit);
Intent intent = getIntent();
String data_name = intent.getStringExtra("name");
String data_surname = intent.getStringExtra("surname");
String data_enterdate= intent.getStringExtra("enterdate");
String data_entertime = intent.getStringExtra("entertime");
String data_exitdate = intent.getStringExtra("exitdate");
String data_exittime = intent.getStringExtra("surname"); //typo here
name = (EditText) findViewById(R.id.username); //corrected
surName = (EditText) findViewById(R.id.usersurname); //corrected
date = (EditText) findViewById(R.id.date2);
time = (EditText) findViewById(R.id.time2);
eDate = (EditText) findViewById(R.id.date3);
eTime = (EditText) findViewById(R.id.time3);
name.setText(data_name);
surName.setText(data_surname);
date.setText(data_enterdate);
time.setText(data_entertime);
eDate.setText(data_exitdate);
eTime.setText(data_exittime);
}
public void onCancel(View btnCancel){
finish();
}
public void onSave(View btnSave){
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.edit, 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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
关于java - 如何使用编辑字段更新sql表？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31339605/