我已经为此苦苦挣扎了好几天了。当我创建一个新联盟并打开 BowlerActivity 时，我可以看到传递给它的主键值。例如，如果 Dummy League = 5，我可以在下一个 Activity 中看到该值。我的问题是，我希望能够在创建投球手时将此值 (5) 关联到投球手。我似乎无法将传递的值放入对话框中以创建新的投球手；为了将其保存到我数据库中的 Bowler 表中。
使用MainActivity传递主键
//On Long Click On The RecyclerView Item An Alert Dialog Is Opened With The Option To Choose Edit/Delete
recyclerView.addOnItemTouchListener(new RecyclerTouchListener(this,
recyclerView, new RecyclerTouchListener.ClickListener() {
@Override
public void onClick(View view, final int position) {
int leagueId = leaguesList.get(position).getId();
Intent myIntent = new Intent(getBaseContext(), BowlerActivity.class);
myIntent.putExtra("leagueId", leagueId);
startActivity(myIntent);
}
Bowler Activity
public class BowlerActivity extends AppCompatActivity {
private BowlerAdapter mAdapter;
private List<Bowler> bowlersList = new ArrayList<>();
private CoordinatorLayout coordinatorLayout;
private RecyclerView recyclerView;
private TextView noBowlersView;
private TextView bowlerLeagueId;
private DatabaseHelper db;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bowler);
//Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
//setSupportActionBar(toolbar);
String savedExtra = String.valueOf(getIntent().getIntExtra("leagueId",1));
TextView myText = (TextView) findViewById(R.id.tvLeagueId);
final String s = myText.toString();
myText.setText(savedExtra);
coordinatorLayout = findViewById(R.id.coordinator_layout);
recyclerView = findViewById(R.id.recycler_view);
noBowlersView = findViewById(R.id.empty_bowlers_view);
db = new DatabaseHelper(this);
bowlersList.addAll(db.getAllBowlers());
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.add_bowler_fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
showBowlerDialog(false, null, -1);
}
});
mAdapter = new BowlerAdapter(this, bowlersList);
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.addItemDecoration(new MyDividerItemDecoration(this, LinearLayoutManager.VERTICAL, 16));
recyclerView.setAdapter(mAdapter);
toggleEmptyBowlers();
//On Long Click On The RecyclerView Item An Alert Dialog Is Opened With The Option To Choose Edit/Delete
recyclerView.addOnItemTouchListener(new RecyclerTouchListener(this,
recyclerView, new RecyclerTouchListener.ClickListener() {
@Override
public void onClick(View view, final int position) {
//Intent myIntent = new Intent(getApplicationContext(), SeriesActivity.class);
//startActivity(myIntent);
}
@Override
public void onLongClick(View view, int position) {
showActionsDialog(position);
}
}));
}
//Inserting New Bowler In The Database And Refreshing The List
private void createBowler(String bowler) {
//Inserting Bowler In The Database And Getting Newly Inserted Bowler Id
long id = db.insertBowler(bowler);
//Get The Newly Inserted Bowler From The Database
Bowler n = db.getBowler(id);
if (n != null) {
//Adding New Bowler To The Array List At Position 0
bowlersList.add(0, n);
//Refreshing The List
mAdapter.notifyDataSetChanged();
toggleEmptyBowlers();
}
}
//Updating Bowler In The Database And Updating The Item In The List By Its Position
private void updateBowler(String name, int position) {
Bowler n = bowlersList.get(position);
//Updating Bowler Text
n.setName(name);
//n.setLeagueId( );
//Updating The Bowler In The Database
db.updateBowler(n);
//Refreshing The List
bowlersList.set(position, n);
mAdapter.notifyItemChanged(position);
toggleEmptyBowlers();
}
//Deleting Bowler From SQLite Database And Removing The Bowler Item From The List By Its Position
private void deleteBowler(int position) {
// deleting the note from db
db.deleteBowler(bowlersList.get(position));
//Removing The Bowler From The List
bowlersList.remove(position);
mAdapter.notifyItemRemoved(position);
toggleEmptyBowlers();
}
//Opens Dialog With Edit/Delete Options
//Edit - 0
//Delete - 0
private void showActionsDialog(final int position) {
CharSequence colors[] = new CharSequence[]{"Edit", "Delete"};
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Choose option");
builder.setItems(colors, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
if (which == 0) {
showBowlerDialog(true, bowlersList.get(position), position);
} else {
deleteBowler(position);
}
}
});
builder.show();
}
//Show Alert Dialog With EditText Options to Enter/Edit A League
//When shouldUpdate = true, It Will Automatically Display Old Bowler Name And Change The Button Text To UPDATE
private void showBowlerDialog(final boolean shouldUpdate, final Bowler bowler, final int position) {
LayoutInflater layoutInflaterAndroid = LayoutInflater.from(getApplicationContext());
View view = layoutInflaterAndroid.inflate(R.layout.dialog_bowler, null);
AlertDialog.Builder alertDialogBuilderUserInput = new AlertDialog.Builder(BowlerActivity.this);
alertDialogBuilderUserInput.setView(view);
final EditText inputBowler = view.findViewById(R.id.etBowlerNameInput);
//final EditText inputBowlerLeagueId = view.findViewById( R.id.tvLeagueId );
TextView dialogTitle = view.findViewById(R.id.dialog_title);
dialogTitle.setText(!shouldUpdate ? getString(R.string.lbl_new_bowler_title) : getString(R.string.lbl_edit_bowler_title));
if (shouldUpdate && bowler != null) {
inputBowler.setText(bowler.getName());
}
alertDialogBuilderUserInput
.setCancelable(false)
.setPositiveButton(shouldUpdate ? "update" : "save", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialogBox, int id) {
}
})
.setNegativeButton("cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialogBox, int id) {
dialogBox.cancel();
}
});
final AlertDialog alertDialog = alertDialogBuilderUserInput.create();
alertDialog.show();
alertDialog.getButton(AlertDialog.BUTTON_POSITIVE).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//Show Toast Message When No Text Is Entered
if (TextUtils.isEmpty(inputBowler.getText().toString())) {
Toast.makeText(BowlerActivity.this, "Enter Bowler!", Toast.LENGTH_SHORT).show();
return;
} else {
alertDialog.dismiss();
}
//Check If User Is Updating Bowler
if (shouldUpdate && bowler != null) {
//Updating Bowler By Its Id
updateBowler(inputBowler.getText().toString(), position);
} else {
//Creating New Bowler
createBowler(inputBowler.getText().toString());
}
}
});
}
//Toggling List And Empty Bowler View
private void toggleEmptyBowlers() {
//You Can Check bowlerList.size() > 0
if (db.getBowlersCount() > 0) {
noBowlersView.setVisibility( View.GONE);
} else {
noBowlersView.setVisibility( View.VISIBLE);
}
}
}
任何有关此问题的帮助将不胜感激。
最佳答案
我认为您需要为 savedExtra 变量提供更大的范围，然后使用它。所以:-
- 将 savedExtra 声明为类变量。
- 更改其贴标位置并设置为仅设置值，而不声明它。
- 使用 savedExtra 变量设置新投球手的 ID。
以下代码(请参阅带有//<<<< ?????? 的注释以了解更改后的添加代码)我相信可以解决该问题:-
public class BowlerActivity extends AppCompatActivity {
private BowlerAdapter mAdapter;
private List<Bowler> bowlersList = new ArrayList<>();
private CoordinatorLayout coordinatorLayout;
private RecyclerView recyclerView;
private TextView noBowlersView;
private TextView bowlerLeagueId;
private DatabaseHelper db;
private String savedExtra; //<<<< Added change 1.
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bowler);
//Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
//setSupportActionBar(toolbar);
savedExtra = String.valueOf(getIntent().getIntExtra("leagueId",1)); //<<<< Saved Extra change 2.
TextView myText = (TextView) findViewById(R.id.tvLeagueId);
final String s = myText.toString();
myText.setText(savedExtra);
coordinatorLayout = findViewById(R.id.coordinator_layout);
recyclerView = findViewById(R.id.recycler_view);
noBowlersView = findViewById(R.id.empty_bowlers_view);
db = new DatabaseHelper(this);
bowlersList.addAll(db.getAllBowlers());
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.add_bowler_fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
showBowlerDialog(false, null, -1);
}
});
mAdapter = new BowlerAdapter(this, bowlersList);
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.addItemDecoration(new MyDividerItemDecoration(this, LinearLayoutManager.VERTICAL, 16));
recyclerView.setAdapter(mAdapter);
toggleEmptyBowlers();
//On Long Click On The RecyclerView Item An Alert Dialog Is Opened With The Option To Choose Edit/Delete
recyclerView.addOnItemTouchListener(new RecyclerTouchListener(this,
recyclerView, new RecyclerTouchListener.ClickListener() {
@Override
public void onClick(View view, final int position) {
//Intent myIntent = new Intent(getApplicationContext(), SeriesActivity.class);
//startActivity(myIntent);
}
@Override
public void onLongClick(View view, int position) {
showActionsDialog(position);
}
}));
}
//Inserting New Bowler In The Database And Refreshing The List
private void createBowler(String bowler) {
//Inserting Bowler In The Database And Getting Newly Inserted Bowler Id
bowler.setLeagueId(savedExtra); //<<<< ADDED change 3.
long id = db.insertBowler(bowler);
//Get The Newly Inserted Bowler From The Database
Bowler n = db.getBowler(id);
if (n != null) {
//Adding New Bowler To The Array List At Position 0
bowlersList.add(0, n);
//Refreshing The List
mAdapter.notifyDataSetChanged();
toggleEmptyBowlers();
}
}
//Updating Bowler In The Database And Updating The Item In The List By Its Position
private void updateBowler(String name, int position) {
Bowler n = bowlersList.get(position);
//Updating Bowler Text
n.setName(name);
//n.setLeagueId( );
//Updating The Bowler In The Database
db.updateBowler(n);
//Refreshing The List
bowlersList.set(position, n);
mAdapter.notifyItemChanged(position);
toggleEmptyBowlers();
}
//Deleting Bowler From SQLite Database And Removing The Bowler Item From The List By Its Position
private void deleteBowler(int position) {
// deleting the note from db
db.deleteBowler(bowlersList.get(position));
//Removing The Bowler From The List
bowlersList.remove(position);
mAdapter.notifyItemRemoved(position);
toggleEmptyBowlers();
}
//Opens Dialog With Edit/Delete Options
//Edit - 0
//Delete - 0
private void showActionsDialog(final int position) {
CharSequence colors[] = new CharSequence[]{"Edit", "Delete"};
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Choose option");
builder.setItems(colors, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
if (which == 0) {
showBowlerDialog(true, bowlersList.get(position), position);
} else {
deleteBowler(position);
}
}
});
builder.show();
}
//Show Alert Dialog With EditText Options to Enter/Edit A League
//When shouldUpdate = true, It Will Automatically Display Old Bowler Name And Change The Button Text To UPDATE
private void showBowlerDialog(final boolean shouldUpdate, final Bowler bowler, final int position) {
LayoutInflater layoutInflaterAndroid = LayoutInflater.from(getApplicationContext());
View view = layoutInflaterAndroid.inflate(R.layout.dialog_bowler, null);
AlertDialog.Builder alertDialogBuilderUserInput = new AlertDialog.Builder(BowlerActivity.this);
alertDialogBuilderUserInput.setView(view);
final EditText inputBowler = view.findViewById(R.id.etBowlerNameInput);
//final EditText inputBowlerLeagueId = view.findViewById( R.id.tvLeagueId );
TextView dialogTitle = view.findViewById(R.id.dialog_title);
dialogTitle.setText(!shouldUpdate ? getString(R.string.lbl_new_bowler_title) : getString(R.string.lbl_edit_bowler_title));
if (shouldUpdate && bowler != null) {
inputBowler.setText(bowler.getName());
}
alertDialogBuilderUserInput
.setCancelable(false)
.setPositiveButton(shouldUpdate ? "update" : "save", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialogBox, int id) {
}
})
.setNegativeButton("cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialogBox, int id) {
dialogBox.cancel();
}
});
final AlertDialog alertDialog = alertDialogBuilderUserInput.create();
alertDialog.show();
alertDialog.getButton(AlertDialog.BUTTON_POSITIVE).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//Show Toast Message When No Text Is Entered
if (TextUtils.isEmpty(inputBowler.getText().toString())) {
Toast.makeText(BowlerActivity.this, "Enter Bowler!", Toast.LENGTH_SHORT).show();
return;
} else {
alertDialog.dismiss();
}
//Check If User Is Updating Bowler
if (shouldUpdate && bowler != null) {
//Updating Bowler By Its Id
updateBowler(inputBowler.getText().toString(), position);
} else {
//Creating New Bowler
createBowler(inputBowler.getText().toString());
}
}
});
}
//Toggling List And Empty Bowler View
private void toggleEmptyBowlers() {
//You Can Check bowlerList.size() > 0
if (db.getBowlersCount() > 0) {
noBowlersView.setVisibility( View.GONE);
} else {
noBowlersView.setVisibility( View.VISIBLE);
}
}
}
注意这是原则上的代码，尚未经过测试，因此可能包含错误。
关于javascript - 将已传递给新 Activity 的数据保存到 SQLite 数据库中，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/50591739/