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我目前的應用程序從一個SQLite數據庫拉和顯示數據列表視圖。數據庫第一列中的數據顯示在列表視圖中，點擊後，活動開始顯示與第一列關聯的列的其餘部分。數據編輯完成後，數據庫會更新，但列表視圖不顯示更新，除非應用程序重新啓動。我試圖在我的onResume方法中實現startActivityForResult（），但是不成功。我試圖在數據庫更新後刷新我的列表視圖。我怎樣才能做到這一點。Android的ListView的源碼更新刷新
ListView的活動：
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login_listview);
loginList = (ListView)
findViewById(R.id.loginlist);
loginList.setOnItemClickListener(this);
webLogin = (Button)
findViewById(R.id.button3);
webLogin.setOnClickListener(this);
loginArrayList = new ArrayList<LoginDetails>();
loginListAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, populateList());
loginList.setAdapter(loginListAdapter);
}
@Override
public void onClick (View v) {
Intent webLoginIntent = new Intent (this, LoginPlusActivity.class);
startActivity(webLoginIntent);
}
public List<String> populateList(){
List<String> webNameList = new ArrayList<String>();
dataStore openHelperClass = new dataStore (this);
SQLiteDatabase sqliteDatabase = openHelperClass.getReadableDatabase();
Cursor cursor = sqliteDatabase.query(dataStore.TABLE_NAME_INFOTABLE, null, null, null, null, null, dataStore.COLUMN_NAME_SITE, null);
startManagingCursor(cursor);
while (cursor.moveToNext()){
String sName = cursor.getString(cursor.getColumnIndex(dataStore.COLUMN_NAME_SITE));
String wUrl = cursor.getString(cursor.getColumnIndex(dataStore.COLUMN_NAME_ADDRESS));
String uName = cursor.getString(cursor.getColumnIndex(dataStore.COLUMN_NAME_USERNAME));
String pWord = cursor.getString(cursor.getColumnIndex(dataStore.COLUMN_NAME_PASSWORD));
String lNotes = cursor.getString(cursor.getColumnIndex(dataStore.COLUMN_NAME_NOTES));
LoginDetails lpDetails = new LoginDetails();
lpDetails.setsName(sName);
lpDetails.setwUrl(wUrl);
lpDetails.setuName(uName);
lpDetails.setpWord(pWord);
lpDetails.setlNotes(lNotes);
loginArrayList.add(lpDetails);
webNameList.add(sName);
}
sqliteDatabase.close();
return webNameList;
}
@Override
protected void onResume() {
super.onResume();
Intent i = new Intent(LoginList.this, UpdateDeleteLoginList.class);
LoginList.this.startActivityForResult(i, 1);
loginList.setAdapter(loginListAdapter);
loginListAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, populateList());
loginList.setAdapter(loginListAdapter);
}
更新活動：
@Override
public void onClick(View v){
loginSitetext = sName.getText().toString();
loginAddresstext = wUrl.getText().toString();
loginUsertext = uName.getText().toString();
loginpassWordtext = pWord.getText().toString();
loginNotestext = lNotes.getText().toString();
LoginDetails loginDetails = new LoginDetails();
loginDetails.setsName(bundledWebSite);
loginDetails.setwUrl(bundledWebAddress);
loginDetails.setuName(bundledUserName);
loginDetails.setpWord(bundledPassWord);
loginDetails.setlNotes(bundledNotes);
if(v.getId()==R.id.rucBttn){
finish();
}else if(v.getId()==R.id.ruuBttn){
updateLoginDetails(loginDetails);
Intent returnIntent = new Intent();
setResult(RESULT_CANCELED, returnIntent);
finish();
}else if(v.getId()==R.id.rudBttn){
deleteLoginDetails(loginDetails);
}
}
private void updateLoginDetails(LoginDetails loginDetails){
dataStore androidOpenDbHelper = new dataStore(this);
SQLiteDatabase sqliteDatabase = androidOpenDbHelper.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(dataStore.COLUMN_NAME_SITE, loginSitetext);
contentValues.put(dataStore.COLUMN_NAME_ADDRESS, loginAddresstext);
contentValues.put(dataStore.COLUMN_NAME_USERNAME, loginUsertext);
contentValues.put(dataStore.COLUMN_NAME_PASSWORD, loginpassWordtext);
contentValues.put(dataStore.COLUMN_NAME_NOTES, loginNotestext);
String[] whereClauseArgument = new String[1];
whereClauseArgument[0] = loginDetails.getsName();
System.out.println("whereClauseArgument[0] is :" + whereClauseArgument[0]);
sqliteDatabase.update(dataStore.TABLE_NAME_INFOTABLE, contentValues, dataStore.COLUMN_NAME_SITE+"=?", whereClauseArgument);
sqliteDatabase.close();
finish();