我正在开发应用程序，其中用户键入其朋友的个人详细信息并保存到SQLite数据库中。然后，用户可以在另一页面（活动）中查看他的朋友的信息。但是当用户需要查看他朋友的信息时，它不会显示在第二个活动中。需要从数据库表中检索信息。我该怎么做？
以下是代码 -
第一项活动 -
public class PersonalInformation extends Activity
{
EditText txtLikes, txtDislikes, txtType, txtDate;
Button btnView, btnBack;
Spinner nameSpinner;
ArrayAdapter<String> adapter;
String friends[] = {"Kanak Priya", "Joanne Liew", "Melissa Haiting", "Michelle Lam", "Teo Kin Hua", "David Yeo", "Nur Ashiqin", "Stephanie"};
final Context context = this;
private int namesSpinnerId;
LikesDBAdapter likeDB = new LikesDBAdapter(this);
DislikesDBAdapter dlikeDB = new DislikesDBAdapter(this);
@Override
public void onCreate(Bundle savedInstanceState)
{
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.info);
nameSpinner = (Spinner) findViewById(R.id.nameSpinner);
adapter = new ArrayAdapter<String>(this,
R.layout.spinner_text, friends);
nameSpinner.setAdapter(adapter);
/*BuddyDBAdapter buddyDB = new BuddyDBAdapter(this);
// buddyDB.open();
Cursor friendsCursor = buddyDB.getAllNames();
startManagingCursor(friendsCursor);
String[] from = new String[]{BuddyDBAdapter.KEY_NAME};
int[] to = new int[]{R.id.name};
SimpleCursorAdapter friendsCursorAdapter = new SimpleCursorAdapter(this, R.layout.spinner_text, friendsCursor, from, to);
friendsCursorAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
nameSpinner = (Spinner)findViewById(R.id.nameSpinner);
nameSpinner.setAdapter(friendsCursorAdapter);
//buddyDB.close();
nameSpinner.setOnItemSelectedListener(new OnItemSelectedListener()
{
@Override
public void onItemSelected(AdapterView<?> parent, View view, int pos, long id)
{
Cursor c = (Cursor)parent.getItemAtPosition(pos);
namesSpinnerId = c.getInt(c.getColumnIndexOrThrow(BuddyDBAdapter.KEY_ROWID));
}
@Override
public void onNothingSelected(AdapterView<?> parent)
{
// TODO Auto-generated method stub
}
});
//buddyDB.close();
*/
Button btnSave = (Button) findViewById(R.id.btnSave);
btnSave.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
likeDB.open();
long like_id;
nameSpinner = (Spinner) findViewById(R.id.nameSpinner);
String NameValue = nameSpinner.getSelectedItem().toString();
txtLikes = (EditText) findViewById(R.id.txtLikes);
String LikeValue = txtLikes.getText().toString();
like_id = likeDB.insertLikes(LikeValue, NameValue);
likeDB.close();
dlikeDB.open();
long dlike_id;
nameSpinner = (Spinner) findViewById(R.id.nameSpinner);
String NamesValue = nameSpinner.getSelectedItem().toString();
txtDislikes = (EditText) findViewById(R.id.txtDislikes);
String DislikeValue = txtDislikes.getText().toString();
dlike_id = dlikeDB.insertDislikes(DislikeValue, NamesValue);
dlikeDB.close();
txtDate = (EditText) findViewById(R.id.txtDate);
txtType = (EditText) findViewById(R.id.txtType);
txtLikes = (EditText) findViewById(R.id.txtLikes);
txtDislikes = (EditText) findViewById(R.id.txtDislikes);
if(txtDate.getText().toString().length() == 0 || txtType.getText().toString().length() == 0 ||
txtLikes.getText().toString().length() == 0 || txtDislikes.getText().toString().length() == 0)
{
txtDate.setError("Please key in the date");
txtType.setError("Please key in category");
txtLikes.setError("Please key in their likes");
txtDislikes.setError("Please key in their dislikes");
}
else
{
Toast.makeText(getBaseContext(), "Your information is saved successfully! :D", Toast.LENGTH_LONG).show();
}
}
});
btnBack = (Button) findViewById(R.id.btnMain);
btnBack.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View arg0)
{
finish();
}
});
btnView = (Button) findViewById(R.id.btnView);
btnView.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
nameSpinner = (Spinner) findViewById(R.id.nameSpinner);
EditText txtDate = (EditText) findViewById(R.id.txtDate);
EditText txtType = (EditText) findViewById(R.id.txtType);
EditText txtLikes = (EditText) findViewById(R.id.txtLikes);
EditText txtDislikes = (EditText) findViewById(R.id.txtDislikes);
Intent i = new Intent(PersonalInformation.this, SavedInfo.class);
Bundle b = new Bundle();
b.putString("name", nameSpinner.getSelectedItem().toString());
b.putString("date", txtDate.getText().toString());
b.putString("category", txtType.getText().toString());
b.putString("likes", txtLikes.getText().toString());
b.putString("dislikes", txtDislikes.getText().toString());
i.putExtras(b);
startActivity(i);
}
});
EditText txtDate = (EditText) findViewById(R.id.txtDate);
txtDate.setHint("birthdate or wedding date");
txtDate.setFilters(new InputFilter[] {
new InputFilter() {
@Override
public CharSequence filter(CharSequence source, int start,
int end, Spanned dest, int dstart, int dend)
{
if(source.equals(""))
{
return source;
}
if(source.toString().matches("[0-9 -]+"))
{
return source;
}
return "";
}
}
});
EditText txtType = (EditText) findViewById(R.id.txtType);
txtType.setHint("birthday or wedding");
txtType.setFilters(new InputFilter[] {
new InputFilter() {
@Override
public CharSequence filter(CharSequence source, int start,
int end, Spanned dest, int dstart, int dend)
{
if(source.equals(""))
{
return source;
}
if(source.toString().matches("[birthday wedding Birthday Wedding BIRTHDAY WEDDING]+"))
{
return source;
}
return "";
}
}
});
EditText txtLikes = (EditText) findViewById(R.id.txtLikes);
txtLikes.setHint("e.g. Skating, Photography separate by comma");
txtLikes.setFilters(new InputFilter[] {
new InputFilter() {
@Override
public CharSequence filter(CharSequence source, int start,
int end, Spanned dest, int dstart, int dend)
{
if(source.equals(""))
{
return source;
}
if(source.toString().matches("[a-z A-Z -]+"))
{
return source;
}
return "";
}
}
});
EditText txtDislikes = (EditText) findViewById(R.id.txtDislikes);
txtDislikes.setHint("e.g. Skating, Photography separate by comma");
txtDislikes.setFilters(new InputFilter[] {
new InputFilter() {
@Override
public CharSequence filter(CharSequence source, int start,
int end, Spanned dest, int dstart, int dend)
{
if(source.equals(""))
{
return source;
}
if(source.toString().matches("[a-z A-Z -]+"))
{
return source;
}
return "";
}
}
});
}
}
第二项活动
public class SavedInfo extends Activity
{
final Context context = this;
@Override
public void onCreate(Bundle savedInstanceState)
{
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.saved_info);
Bundle b = this.getIntent().getExtras();
String name = b.getString("name");
String date = b.getString("date");
String category = b.getString("category");
String likes = b.getString("likes");
String dislikes = b.getString("dislikes");
((TextView)findViewById(R.id.textName)).setText(name);
((TextView)findViewById(R.id.textDate)).setText(date);
((TextView)findViewById(R.id.textType)).setText(category);
((TextView)findViewById(R.id.textLikes)).setText(likes);
((TextView)findViewById(R.id.textDislikes)).setText(dislikes);
Button btnEdit = (Button) findViewById(R.id.btnEdit);
btnEdit.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
Intent backIntent = new Intent(context, PersonalInformation.class);
startActivity(backIntent);
}
});
Button btnBack = (Button) findViewById(R.id.btnMain);
btnBack.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
Intent menuIntent = new Intent(context, MainPage.class);
startActivity(menuIntent);
}
});
}
}
请帮助我如何将数据库表中的数据作为TextView检索到第二个活动中。我将非常感谢您提供的任何帮助。提前致谢！ =）
答案 0 :(得分：1)
如果我理解正确，您需要的是，以下是一个代码片段，用于从SQLite数据库中提取查询结果。希望这会对你有所帮助：
// Access Database to fetch info
try {
newDB = myDbHelper.getReadableDatabase();
String query = "SELECT * FROM tbl_name WHERE...... = ";
Cursor c = newDB.rawQuery(query,null);
if (c != null ) {
if (c.moveToFirst()) {
do {
Bean infoBean = new infoBean();
infoBean.firstName = c.getString(c.getColumnIndex("firstName"));
infoBean.lastName = c.getInt(c.getColumnIndex("lastName"));
infoBean.id = c.getInt(c.getColumnIndex("_id"));
// Do something here to display information in TextView
} while (c.moveToNext());
}
}
} catch (SQLiteException se) {
Log.e(getClass().getSimpleName(), "Could not create or Open the database");
}
myDbHelper.close();