Contacts（）类： 公共课联系人{
for(i in levels(n)){
x.subset <- subset(data$x, data$n == i)
x.big <- NULL
x.big.prev <- 1
for(j in y){
x.big[j] <- x.subset[j]^2
if((mean(x.big.prev)-mean(x.big)) >=30){
break
} #end of if() statement
x.big.prev <- x.big #####
} #end of j-loop
plot(y, x.big.prev)
} #end of i loop
}
Example4（）类： 公共类Example4扩展了AppCompatActivity {
int _id;
String _name;
String _mobile;
String _home;
String _office;
String _email;
String _companyName;
String _jobRole;
String _address;
public Contacts( String name, String mobile, String home, String office, String address, String email,String companyName, String jobRole ) {
this._name = name;
this._mobile = mobile;
this._home = home;
this._office = office;
this._address = address;
this._email = email;
this._companyName = companyName;
this._jobRole = jobRole;
}
public Contacts(int id, String name, String mobile, String home, String office,String address,String email,String companyName, String jobRole ) {
this._id = id;
this._name = name;
this._mobile = mobile;
this._home = home;
this._office = office;
this._address = address;
this._email = email;
this._companyName = companyName;
this._jobRole = jobRole;
}
public Contacts() {
}
public String getCompanyName() {
return _companyName;
}
public void setCompanyName(String companyName) {
this._companyName = companyName;
}
public String getEmail() {
return _email;
}
public void setEmail(String email) {
this._email = email;
}
public String getHome() {
return _home;
}
public void setHome(String home) {
this._home = home;
}
public int getId() {
return _id;
}
public void setId(int id) {
this._id = id;
}
public String getJobRole() {
return _jobRole;
}
public void setJobRole(String jobRole) {
this._jobRole = jobRole;
}
public String getMobile() {
return _mobile;
}
public void setMobile(String mobile) {
this._mobile = mobile;
}
public String getName() {
return _name;
}
public void setName(String name) {
this._name = name;
}
public String getOffice() {
return _office;
}
public void setOffice(String office) {
this._office = office;
}
public String getAddress() {
return _address;
}
public void setAddress(String address) {
this._address = address;
}
}
DisplayContacts（）类：
公共类DisplayContacts扩展了Activity {
DbHandler dbHandler;
ListView listView;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.example4);
dbHandler = new DbHandler(this);
List<Contacts> listContacts = dbHandler.getAllContacts();
ArrayAdapter arrayAdapter = new ArrayAdapter(this,android.R.layout.simple_list_item_1,listContacts);
listView = (ListView) findViewById(R.id.listView1);
listView.setAdapter(arrayAdapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
Bundle bundle = new Bundle();
int id_search = i ;
bundle.putInt("id",id_search);
Intent intent = new Intent(getApplicationContext(),DisplayContacts.class);
intent.putExtras(bundle);
startActivity(intent);
}
});
Log.d("Insert: ", "Inserting ..");
dbHandler.addContact(new Contacts("Ravi", "9100000000","044-123456","","","r@gmail.com","qbrik","developer"));
dbHandler.addContact(new Contacts("Srinivas", "9199999999","044-123456","","","r@gmail.com","qbrik","developer"));
dbHandler.addContact(new Contacts("Tommy", "9522222222","044-123456","","","r@gmail.com","qbrik","developer"));
dbHandler.addContact(new Contacts("Karthik", "9533333333","044-123456","","","r@gmail.com","qbrik","developer"));
Log.d("Reading: ", "Reading all contacts..");
for (Contacts cn : listContacts) {
String log = "Id: "+cn.getId()+" ,Name: " + cn.getName() + " ,Mobile: " + cn.getMobile() + " ,Home: " + cn.getHome() + " ,Office: " + cn.getOffice() + " ,Email: " + cn.getEmail() + " ,Company Name: " + cn.getCompanyName() + " ,Job Role: " + cn.getJobRole();
Log.d("Name: ", log);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
super.onOptionsItemSelected(item);
switch(item.getItemId()) {
case R.id.item1:Bundle dataBundle = new Bundle();
dataBundle.putInt("id", 0);
Intent intent = new Intent(getApplicationContext(),DisplayContacts.class);
intent.putExtras(dataBundle);
startActivity(intent);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
DbHandler（）类：
公共类DbHandler扩展了SQLiteOpenHelper {
TextView name;
TextView mobile;
TextView home;
TextView office;
TextView companyName;
TextView jobRole;
TextView email;
TextView address;
private DbHandler dbHandler;
private int id_update =0;
private Contacts contacts;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.example4_display);
name = (TextView) findViewById(R.id.editName);
mobile = (TextView) findViewById(R.id.editTextMobile);
home = (TextView) findViewById(R.id.editTextHome);
office = (TextView) findViewById(R.id.editTextOffice);
companyName = (TextView) findViewById(R.id.editTextComapanyName);
jobRole = (TextView) findViewById(R.id.editTextJobRole);
email = (TextView) findViewById(R.id.editEmail);
address = (TextView) findViewById(R.id.editAddress);
dbHandler = new DbHandler(this);
contacts = new Contacts();
Bundle bundle = getIntent().getExtras();
if(bundle != null) {
int value = bundle.getInt("id");
if(value > 0) {
Cursor cs = (Cursor) dbHandler.getContact(value);
id_update = value;
cs.moveToFirst();
String nam = cs.getString(cs.getColumnIndex(DbHandler.KEY_NAME));
String mob = cs.getString(cs.getColumnIndex(DbHandler.KEY_MOBILE));
String hom = cs.getString(cs.getColumnIndex(DbHandler.KEY_HOME));
String off = cs.getString(cs.getColumnIndex(DbHandler.KEY_OFFICE));
String com = cs.getString(cs.getColumnIndex(DbHandler.KEY_COMPANYNAME));
String job = cs.getString(cs.getColumnIndex(DbHandler.KEY_JOBROLE));
String emai = cs.getString(cs.getColumnIndex(DbHandler.KEY_EMAIL));
String addr = cs.getString(cs.getColumnIndex(DbHandler.KEY_ADDRESS));
if(!cs.isClosed()) {
cs.close();
Button b = (Button) findViewById(R.id.button1);
b.setVisibility(View.INVISIBLE);
name.setText(nam);
name.setFocusable(false);
name.setClickable(false);
mobile.setText(mob);
mobile.setFocusable(false);
mobile.setClickable(false);
home.setText(hom);
home.setFocusable(false);
home.setClickable(false);
office.setText(off);
office.setFocusable(false);
office.setClickable(false);
companyName.setText(com);
companyName.setFocusable(false);
companyName.setClickable(false);
jobRole.setText(job);
jobRole.setFocusable(false);
jobRole.setClickable(false);
email.setText(emai);
email.setFocusable(false);
email.setClickable(false);
address.setText(addr);
address.setFocusable(false);
address.setClickable(false);
}
}
}
}
public void run(View view) {
Bundle bundle = getIntent().getExtras();
if(bundle != null) {
int value =bundle.getInt("id");
if(value > 0) {
if(dbHandler.updateContact(new Contacts(id_update,name.getText().toString(),mobile.getText().toString(),home.getText().toString(),office.getText().toString(),companyName.getText().toString(),jobRole.getText().toString(),email.getText().toString(),address.getText().toString()))) {
Toast.makeText(getApplicationContext(), "Updated", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(getApplicationContext(),Example4.class);
startActivity(intent);
} else{
Toast.makeText(getApplicationContext(), "not Updated", Toast.LENGTH_SHORT).show();
}
} else{
if(dbHandler.addContact(new Contacts(name.getText().toString(),mobile.getText().toString(),home.getText().toString(),office.getText().toString(),companyName.getText().toString(),jobRole.getText().toString(),email.getText().toString(),address.getText().toString()))) {
Toast.makeText(getApplicationContext(), "done", Toast.LENGTH_SHORT).show();
} else{
Toast.makeText(getApplicationContext(), "not done", Toast.LENGTH_SHORT).show();
}
Intent intent = new Intent(getApplicationContext(),Example4.class);
startActivity(intent);
}
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
Bundle bundle = getIntent().getExtras();
if(bundle !=null) {
int value = bundle.getInt("id");
if(value > 0) {
getMenuInflater().inflate(R.menu.display_contact,menu);
}else {
getMenuInflater().inflate(R.menu.menu_main, menu);
}
}
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
super.onOptionsItemSelected(item);
switch(item.getItemId()) {
case R.id.Edit_Contact:
Button b = (Button) findViewById(R.id.button1);
b.setVisibility(View.VISIBLE);
name.setEnabled(true);
name.setFocusableInTouchMode(true);
name.setClickable(true);
mobile.setEnabled(true);
mobile.setFocusableInTouchMode(true);
mobile.setClickable(true);
home.setEnabled(true);
home.setFocusableInTouchMode(true);
home.setClickable(true);
office.setEnabled(true);
office.setFocusableInTouchMode(true);
office.setClickable(true);
companyName.setEnabled(true);
companyName.setFocusableInTouchMode(true);
companyName.setClickable(true);
jobRole.setEnabled(true);
jobRole.setFocusableInTouchMode(true);
jobRole.setClickable(true);
email.setEnabled(true);
email.setFocusableInTouchMode(true);
email.setClickable(true);
address.setEnabled(true);
address.setFocusableInTouchMode(true);
address.setClickable(true);
return true;
case R.id.Delete_Contact:
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
但是此代码无效，请您更新代码
答案 0 :(得分：-1)
可能你想要......
if(dbHandler.updateContact(new Contacts(id_update,name.getText().toString(),mobile.getText().toString(),home.getText().toString(),office.getText().toString(),companyName.getText().toString(),jobRole.getText().toString(),email.getText().toString(),address.getText().toString()))) {}
您还需要更改addContact / updateContact以返回布尔值，如下所示：
public Boolean addContact(Contacts contacts) {
SQLiteDatabase sqLiteDatabase = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(KEY_NAME,contacts.getName());
contentValues.put(KEY_MOBILE,contacts.getMobile());
contentValues.put(KEY_HOME,contacts.getHome());
contentValues.put(KEY_OFFICE,contacts.getOffice());
contentValues.put(KEY_ADDRESS,contacts.getAddress());
contentValues.put(KEY_EMAIL,contacts.getEmail());
contentValues.put(KEY_COMPANYNAME,contacts.getCompanyName());
contentValues.put(KEY_JOBROLE,contacts.getJobRole());
sqLiteDatabase.insert(TABLE_CONTACTS,null,contentValues);
sqLiteDatabase.close();
return true;
}
尝试此功能并告诉我stackstrace错误
public List<Contacts>getAllContacts(){
List<Contacts> contactsList = new ArrayList<Contacts>();
String selectQuery = "SELECT * FROM " + TABLE_CONTACTS;
SQLiteDatabase sqLiteDatabase = this.getWritableDatabase();
Cursor cursor = sqLiteDatabase.rawQuery(selectQuery,null);
if (cursor.moveToFirst()){
do {
Contacts contacts = new Contacts();
contacts.setId(Integer.parseInt(cursor.getString(cursor.getColumnIndexOrThrow(KEY_ID))));
contacts.setName(cursor.getString(cursor.getColumnIndexOrThrow(KEY_NAME)));
contacts.setMobile(cursor.getString(cursor.getColumnIndexOrThrow(KEY_MOBILE)));
contacts.setHome(cursor.getString(cursor.getColumnIndexOrThrow(KEY_HOME)));
contacts.setOffice(cursor.getString(cursor.getColumnIndexOrThrow(KEY_OFFICE)));
contacts.setAddress(cursor.getString(cursor.getColumnIndexOrThrow(KEY_ADDRESS)));
contacts.setEmail(cursor.getString(cursor.getColumnIndexOrThrow(KEY_EMAIL)));
contacts.setCompanyName(cursor.getString(cursor.getColumnIndexOrThrow(KEY_COMPANYNAME)));
contacts.setJobRole(cursor.getString(cursor.getColumnIndexOrThrow(KEY_JOBROLE)));
contactsList.add(contacts);
}while (cursor.moveToNext());
}
return contactsList;
}