我正在构建一个训练日志，其中包含用户在TrainingLogCreate中添加的两个字符串，这些字符串使用DBAdapter中的SQLite数据库添加到TrainingLog中的自定义listView（lv）。我的问题是我想从列表视图中删除一行，为此我需要通过自定义列表视图适配器（TrainingAdapter）添加一个按钮。但是，我不确定如何从TrainingLog（主片段）访问我的按钮，并在那里实现onClickListener方法。关于如何做到这一点的任何想法？
TrainingLog：
public class TrainingLog extends Fragment {
ListView lv;
ArrayList<String> players = new ArrayList<String>();
ArrayAdapter<String> adapter;
ArrayAdapter<String> clearAdapter;
ArrayList<String> details = new ArrayList<String>();
public TrainingLog() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View rootView = inflater.inflate(R.layout.fragment_training_log, container, false);
lv = (ListView) rootView.findViewById(R.id.myListView);
final DBAdapter db = new DBAdapter(this.getActivity());
setHasOptionsMenu(true);
players.clear();
//OPEN
db.openDB();
//RETRIEVE
Cursor c=db.getAllNames();
while(c.moveToNext())
{
String name=c.getString(1);
players.add(name);
String pos=c.getString(2);
details.add(pos);
}
db.close();
//TrainingAdapter adapter = new TrainingAdapter(this, players);
//adapter=new ArrayAdapter<String>(this.getActivity(),android.R.layout.simple_selectable_list_item,players);
//lv.setAdapter(adapter);
//ListAdapter myTrainingAdapter = new TrainingAdapter(this.getActivity(), players);
//lv.setAdapter(myTrainingAdapter);
String[] playerArray = new String[players.size()];
playerArray = players.toArray(playerArray);
String[] detailArray = new String[details.size()];
detailArray = details.toArray(detailArray);
ListAdapter myAdapter = new TrainingAdapter(this.getActivity(), playerArray, detailArray);
lv.setAdapter(myAdapter);
return rootView;
}
@Override
public void onResume() {
super.onResume();
final DBAdapter db = new DBAdapter(this.getActivity());
players.clear();
///OPEN
db.openDB();
//RETRIEVE
Cursor c=db.getAllNames();
while(c.moveToNext())
{
String name=c.getString(1);
players.add(name);
String pos=c.getString(2);
details.add(pos);
}
db.close();
/* adapter=new ArrayAdapter<String>(this.getActivity(),android.R.layout.simple_selectable_list_item,players);
lv.setAdapter(adapter); */
String[] playerArray = new String[players.size()];
playerArray = players.toArray(playerArray);
String[] detailArray = new String[details.size()];
detailArray = details.toArray(detailArray);
ListAdapter myAdapter = new TrainingAdapter(this.getActivity(), playerArray, detailArray);
lv.setAdapter(myAdapter);
}
private void loadFragment()
{
}
@Override
public void onCreateOptionsMenu(
Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.traning_menu_itemdetail, menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// handle item selection
switch (item.getItemId()) {
case R.id.action_add:
Intent trainingCreateIntent = new Intent (getContext(), TrainingLogCreate.class);
startActivity(trainingCreateIntent);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
TrainingLogCreate：
public class TrainingLogCreate extends AppCompatActivity {
EditText nameTxt;
EditText posTxt;
Button savebtn;
Context context = this;
public TrainingLogCreate() {
// Required empty public constructor
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.training_log_create);
savebtn = (Button) findViewById(R.id.saveButton);
nameTxt = (EditText) findViewById(R.id.exercizeActivity);
posTxt = (EditText) findViewById(R.id.exercizeDetails);
final DBAdapter db=new DBAdapter(this);
savebtn.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
//OPEN
db.openDB();
//INSERT
long result=db.add(nameTxt.getText().toString(), posTxt.getText().toString());
if(result > 0)
{
nameTxt.setText("");
posTxt.setText("");
}else
{
Toast.makeText(getApplicationContext(), "Failure", Toast.LENGTH_SHORT).show();
}
//CLOSE DB
db.close();
//Close Fragment
finish();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater mif = getMenuInflater();
mif.inflate(R.menu.training_create_menu, menu);
getActionBar().show();
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// handle item selection
switch (item.getItemId()) {
case R.id.action_save:
//add save functionality
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
TrainingAdapter：
public class TrainingAdapter extends ArrayAdapter<String> {
private final String[] playerArray;
private final String[] detailArray;
Button removeButton;
TrainingAdapter(FragmentActivity context, String[] playerArray, String[] detailArray) {
super(context, R.layout.training_row, playerArray);
this.playerArray = playerArray;
this.detailArray = detailArray;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater JohnsInflater = LayoutInflater.from(getContext());
View customView = JohnsInflater.inflate(R.layout.training_row, parent, false);
TextView exercizeTextView = (TextView) customView.findViewById(R.id.exercizeTextView);
TextView detailTextView = (TextView) customView.findViewById(R.id.detailTextView);
Button removeButton = (Button) customView.findViewById(R.id.deleteButton);
removeButton.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
final DBAdapter db = new DBAdapter();
}
});
exercizeTextView.setText(playerArray[position]);
detailTextView.setText(detailArray[position]);
return customView;
}
}
将对DBAdapter：
public class DBAdapter {
//COLUMNS
static final String ROWID="id";
static final String NAME = "name";
static final String POSITION = "position";
//DB PROPERTIES
static final String DBNAME="m_DB";
static final String TBNAME="m_TB";
static final int DBVERSION='1';
static final String CREATE_TB="CREATE TABLE m_TB(id INTEGER PRIMARY KEY AUTOINCREMENT,"
+ "name TEXT NOT NULL,position TEXT NOT NULL);";
final Context c;
SQLiteDatabase db;
DBHelper helper;
public DBAdapter(FragmentActivity ctx) {
// TODO Auto-generated constructor stub
this.c=ctx;
helper=new DBHelper(c);
}
// INNER HELPER DB CLASS
private static class DBHelper extends SQLiteOpenHelper
{
public DBHelper(Context context ) {
super(context, DBNAME, null, DBVERSION);
// TODO Auto-generated constructor stub
}
@Override
public void onCreate(SQLiteDatabase db) {
try
{
db.execSQL(CREATE_TB);
} catch (SQLException e) {
e.printStackTrace();
}
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
Log.w("DBAdapetr","Upgrading DB");
db.execSQL("DROP TABLE IF EXISTS m_TB");
onCreate(db);
}
}
// OPEN THE DB
public DBAdapter openDB()
{
try
{
db=helper.getWritableDatabase();
}catch(SQLException e)
{
Toast.makeText(c, e.getMessage(), Toast.LENGTH_LONG).show();
}
return this;
}
//CLOSE THE DB
public void close()
{
helper.close();
}
//INSERT INTO TABLE
public long add(String name,String pos)
{
try
{
ContentValues cv=new ContentValues();
cv.put(NAME, name);
cv.put(POSITION, pos);
return db.insert(TBNAME, ROWID, cv);
}catch(SQLException e)
{
e.printStackTrace();
}
return 0;
}
//REMOVE FROM TABLE
public long remove(String name,String pos)
{
try
{
ContentValues cv=new ContentValues();
cv.remove(name);
cv.remove(pos);
return db.insert(TBNAME, ROWID, cv);
}catch(SQLException e)
{
e.printStackTrace();
}
return 0;
}
//GET ALL VALUES
public Cursor getAllNames()
{
String[] columns={ROWID,NAME,POSITION};
return db.query(TBNAME, columns, null, null, null, null, null);
}
}
答案 0 :(得分：0)
使用界面或广播，您可以这样做。
答案 1 :(得分：0)
创建一个界面，它就可以了。
private View.OnClickListener delete;
public void setDelete(View.OnClickListener delete){
this.delete= delete;
}
removeButton.setTag(position);
removeButton.setOnClickListener(delete);
现在，在您的activity类中实现onClickListener并调用adapter的methosd
public class TrainingLogCreate extends AppCompatActivity implements View.OnClickListener{
@Override
public void onClick(View view) {
Object tag = (Integer) view.getTag();
switch (view.getId()){
case R.id.deleteButton:
if (tag != null && tag instanceof Integer) {
int position = (Integer) tag;
SQLiteDatabase dataBase = db.getWritableDatabase();
dataBase.delete(DBAdapter.TABLE_NAME,
DBAdapter.POSITION +"="+position, null);
yourlistAdapter.notifyDataSetChanged();
尝试让我知道是否有任何问题。