So I am new and working on an app, so I have created homepage of it and then when we click on anyone of it it opens a new activity in which when clicking the button to get the answer doesnt work and it goes back to the homepage. Please help me solve this!
This is my code of main activity
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
CardView Currency = (CardView) findViewById(R.id.Currency);
CardView Area = (CardView) findViewById(R.id.Area);
CardView Length = (CardView) findViewById(R.id.Length);
CardView Temperature = (CardView) findViewById(R.id.Temperature);
CardView Time = (CardView) findViewById(R.id.Time);
CardView Weight = (CardView) findViewById(R.id.Weight);
Currency.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this,Currency.class);
startActivity(intent);
}
});
Weight.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this,Weight.class);
startActivity(intent);
}
});
Time.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this,Time.class);
startActivity(intent);
}
});
Length.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this,Length.class);
startActivity(intent);
}
});
Area.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this,Area.class);
startActivity(intent);
}
});
Temperature.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this,Temperature.class);
startActivity(intent);
}
});
}
And this is of my new activity to open at homepage and convert the value
public class Weight extends AppCompatActivity {
private TextView textView;
private Button button;
private EditText editText;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_weight);
button = findViewById(R.id.button);
textView = findViewById(R.id.textView);
editText = findViewById(R.id.editText);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Toast.makeText(Weight.this, "Request Proceeded", Toast.LENGTH_SHORT).show();
String s = editText.getText().toString();
Integer.parseInt(s);
int kg = Integer.parseInt(s);
double pound = 2.205 * kg;
textView.setText("The corresponding value in Pound is" + pound);
}
});
}
Related
SubActivity cannot INVISIBLE the button in MainActivity I tried to use intent, but I'm not sure.
it SubActivity java code
try to INSIBLE the resetB button in Sub Activity
public class SubActivity extends Activity {
Button resetH, resetH2;
Button resetB, miC;
#SuppressLint("MissingInflatedId")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sub);
ImageButton back = (ImageButton) findViewById(R.id.back);
resetH = (Button) findViewById(R.id.resetH);
resetH2 = (Button) findViewById(R.id.resetH2);
resetB = findViewById(R.id.resetB);
resetH.setOnClickListener(new Button.OnClickListener() {
#Override
public void onClick(View view) {
resetB.setVisibility(View.VISIBLE);
}
});
resetH.setOnClickListener(new Button.OnClickListener() {
#Override
public void onClick(View view) {
resetB.setVisibility(View.INVISIBLE);
}
});
back.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
startActivity(intent);
}
});
I used intent, but I can't move the button
Hello Stackoverflow community!
Recently, a strange error occured to me. It is with a button in my app. When i press it there is nothing happening. No errors, or crashes but also Intent is not functioning. The transition to DeleteAccountActivity is not happening. I don't know why is this happening. The intent which I am using is very simple(passes nothing). Please help me
AccountSettingsActivity.java
public class AccountSettingsActivity extends AppCompatActivity {
private static final String TAG = "AccountSettingsActivity";
private static final int ACTIVITY_NUM = 4;
private String user_id;
private Context mContext;
public SectionsStatePagerAdapter pagerAdapter;
private ViewPager mViewPager;
private RelativeLayout mRelativeLayout;
private Button mDelete;
User mUser;
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_accountsettings);
mContext = AccountSettingsActivity.this;
Log.d(TAG, "onCreate: started.");
mViewPager = (ViewPager) findViewById(R.id.viewpager_container);
mRelativeLayout = (RelativeLayout) findViewById(R.id.relLayout1);
mDelete = (Button) findViewById(R.id.btnDelete);
User mUser = new User();
setupSettingsList();
setupBottomNavigationView();
setupFragments();
getIncomingIntent();
//setup the backarrow for navigating back to "ProfileActivity"
ImageView backArrow = (ImageView) findViewById(R.id.backArrow);
backArrow.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Log.d(TAG, "onClick: navigating back to 'ProfileActivity'");
finish();
mDelete.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(mContext, DeleteAccountActivity.class);
startActivity(intent);
}
});
}
});
}
private void deleteAccounts(){
/* DatabaseReference deleteUser = FirebaseDatabase.getInstance().getReference("users").child(user_id);
DatabaseReference deleteUserPhotos = FirebaseDatabase.getInstance().getReference("user_photos").child(user_id);
DatabaseReference deleteUserPhotoComments = FirebaseDatabase.getInstance().getReference("comments").child(user_id);
deleteUser.removeValue();
deleteUserPhotos.removeValue();
deleteUserPhotoComments.removeValue();*/
// getActivity().overridePendingTransition(R.anim.fade_in, R.anim.fade_out);
FirebaseDatabase.getInstance().getReference()
.child(getString(R.string.dbname_users))
// .child(FirebaseAuth.getInstance().getCurrentUser().getUid())
.child(mUser.getUser_id())
.removeValue();
/* FirebaseDatabase.getInstance().getReference()
.child(getString(R.string.dbname_followers))
.child(mUser.getUser_id())
.child(FirebaseAuth.getInstance().getCurrentUser().getUid())
.removeValue(); */
}
private void getIncomingIntent(){
Intent intent = getIntent();
if(intent.hasExtra(getString(R.string.selected_image))
|| intent.hasExtra(getString(R.string.selected_bitmap))){
//if there is an imageUrl attached as an extra, then it was chosen from the gallery/photo fragment
Log.d(TAG, "getIncomingIntent: New incoming imgUrl");
if(intent.getStringExtra(getString(R.string.return_to_fragment)).equals(getString(R.string.edit_profile_fragment))){
if(intent.hasExtra(getString(R.string.selected_image))){
//set the new profile picture
FirebaseMethods firebaseMethods = new FirebaseMethods(AccountSettingsActivity.this);
firebaseMethods.uploadNewPhoto(getString(R.string.profile_photo), null, 0,
intent.getStringExtra(getString(R.string.selected_image)), null);
}
else if(intent.hasExtra(getString(R.string.selected_bitmap))){
//set the new profile picture
FirebaseMethods firebaseMethods = new FirebaseMethods(AccountSettingsActivity.this);
firebaseMethods.uploadNewPhoto(getString(R.string.profile_photo), null, 0,
null,(Bitmap) intent.getParcelableExtra(getString(R.string.selected_bitmap)));
}
}
}
if(intent.hasExtra(getString(R.string.calling_activity))){
Log.d(TAG, "getIncomingIntent: received incoming intent from " + getString(R.string.profile_activity));
setViewPager(pagerAdapter.getFragmentNumber(getString(R.string.edit_profile_fragment)));
}
}
private void setupFragments(){
pagerAdapter = new SectionsStatePagerAdapter(getSupportFragmentManager());
pagerAdapter.addFragment(new EditProfileFragment(), getString(R.string.edit_profile_fragment)); //fragment 0
pagerAdapter.addFragment(new SignOutFragment(), getString(R.string.sign_out_fragment)); //fragment 1
// pagerAdapter.addFragment(new DeleteAccountFragment(), "Delete Account");
}
public void setViewPager(int fragmentNumber){
mRelativeLayout.setVisibility(View.GONE);
Log.d(TAG, "setViewPager: navigating to fragment #: " + fragmentNumber);
mViewPager.setAdapter(pagerAdapter);
mViewPager.setCurrentItem(fragmentNumber);
}
private void setupSettingsList(){
Log.d(TAG, "setupSettingsList: initializing 'Account Settings' list.");
ListView listView = (ListView) findViewById(R.id.lvAccountSettings);
ArrayList<String> options = new ArrayList<>();
options.add(getString(R.string.edit_profile_fragment)); //fragment 0
options.add(getString(R.string.sign_out_fragment)); //fragement 1
// options.add("Delete Account");
ArrayAdapter adapter = new ArrayAdapter(mContext, android.R.layout.simple_list_item_1, options);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Log.d(TAG, "onItemClick: navigating to fragment#: " + position);
setViewPager(position);
}
});
}
/**
* BottomNavigationView setup
*/
private void setupBottomNavigationView(){
Log.d(TAG, "setupBottomNavigationView: setting up BottomNavigationView");
BottomNavigationViewEx bottomNavigationViewEx = (BottomNavigationViewEx) findViewById(R.id.bottomNavViewBar);
BottomNavigationViewHelper.setupBottomNavigationView(bottomNavigationViewEx);
BottomNavigationViewHelper.enableNavigation(mContext, this,bottomNavigationViewEx);
Menu menu = bottomNavigationViewEx.getMenu();
MenuItem menuItem = menu.getItem(ACTIVITY_NUM);
menuItem.setChecked(true);
}
}
DeleteAccountActivity.java
public class DeleteAccountActivity extends AppCompatActivity {
Button yesButton;
Button cancelButton;
Context mContext;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent intent = getIntent();
setContentView(R.layout.activity_delete_account);
yesButton = (Button) findViewById(R.id.btnDelete2);
cancelButton = (Button) findViewById(R.id.btnDelete3);
yesButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
deleteAllData();
Intent intent = new Intent(mContext, RegisterActivity.class);
startActivity(intent);
}
});
cancelButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(mContext, AccountSettingsActivity.class);
}
});
}
public void deleteAllData(){
DatabaseReference deleteUser = FirebaseDatabase.getInstance().getReference()
.child("users")
.child(FirebaseAuth.getInstance().getCurrentUser().getUid());
DatabaseReference deleteUserPhotos = FirebaseDatabase.getInstance().getReference()
.child("user_photos")
.child(FirebaseAuth.getInstance().getCurrentUser().getUid());
DatabaseReference deleteUserPhotoComments = FirebaseDatabase.getInstance().getReference()
.child("user_account_settings")
.child(FirebaseAuth.getInstance().getCurrentUser().getUid());
DatabaseReference deleteUserFollowing = FirebaseDatabase.getInstance().getReference()
.child("following")
.child(FirebaseAuth.getInstance().getCurrentUser().getUid());
DatabaseReference deleteUserFollowers = FirebaseDatabase.getInstance().getReference()
.child("followers")
.child(FirebaseAuth.getInstance().getCurrentUser().getUid());
deleteUser.removeValue();
deleteUserPhotos.removeValue();
deleteUserPhotoComments.removeValue();
deleteUserFollowing.removeValue();
deleteUserFollowers.removeValue();
}
}
Issue :
Press backarrow (But this will finish the activity)
Press mdelete to trigger the intent. (so no way to trigger intent)
Because when you press backarrow, you are setting the listener on mdelete which actually has the code to trigger intent and finish will kill the activity so no way to trigger intent
Solution : Separate the listeners
backArrow.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Log.d(TAG, "onClick: navigating back to 'ProfileActivity'");
finish();
}
});
mDelete.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(mContext, DeleteAccountActivity.class);
startActivity(intent);
}
});
Please, change the lines with setting the clickListeners to this:
ImageView backArrow = (ImageView) findViewById(R.id.backArrow);
backArrow.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Log.d(TAG, "onClick: navigating back to 'ProfileActivity'");
finish();
}
});
mDelete.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(mContext, DeleteAccountActivity.class);
startActivity(intent);
}
});
I think your onCreate() method should look like this:
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_accountsettings);
mContext = AccountSettingsActivity.this;
Log.d(TAG, "onCreate: started.");
mViewPager = (ViewPager) findViewById(R.id.viewpager_container);
mRelativeLayout = (RelativeLayout) findViewById(R.id.relLayout1);
mDelete = (Button) findViewById(R.id.btnDelete);
User mUser = new User();
setupSettingsList();
setupBottomNavigationView();
setupFragments();
getIncomingIntent();
mDelete.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(mContext, DeleteAccountActivity.class);
startActivity(intent);
}
});
//setup the backarrow for navigating back to "ProfileActivity"
ImageView backArrow = (ImageView) findViewById(R.id.backArrow);
backArrow.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Log.d(TAG, "onClick: navigating back to 'ProfileActivity'");
finish();
}
});
}
One simple thing i can see by skimming through is that the onClick listener for your button that should take you to delete activity is assigned inside the back arrow onClick listener.
So the only time your delete button is assigned a click listener is when you press the back button, and it wont still assign because you already called
finish();
On the activity
Change
backArrow.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Log.d(TAG, "onClick: navigating back to 'ProfileActivity'");
finish();
mDelete.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(mContext, DeleteAccountActivity.class);
startActivity(intent);
} });
} });
To
backArrow.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Log.d(TAG, "onClick: navigating back to 'ProfileActivity'");
finish();
} });
mDelete.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(mContext, DeleteAccountActivity.class);
startActivity(intent);
} });
Hope this helps.
I am trying just to pass the int user input to the next class and print it, see that it works before continuing on using it or something else.
Home.java
start and exit button
public class Home extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button one = (Button) findViewById(R.id.b1);
one.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
goToSecondActivity();
}
});
Button two = (Button) findViewById(R.id.b2);
two.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
finish();
}
});
}
private void goToSecondActivity() {
Intent i = new Intent(this, SelectNumberOfPlayers.class);
startActivity(i);
}
}
SelectNumberOfPlayers.java
Taking only the numbers from the input and passing it to StartGame.class
public class SelectNumberOfPlayers extends AppCompatActivity {
EditText numberOfPlayers;
Button three;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.enter_number_of_players);
three = (Button) findViewById(R.id.button3);
three.setOnClickListener(new View.OnClickListener(){
public void onClick(View v){
String txt = numberOfPlayers.getText().toString();
Intent i = new Intent(getApplicationContext(), StartGame.class);
i.putExtra("players", txt);
startActivity(i);
}
});
}
}
StartGame.java
Receiving Int and printing to TextView
public class StartGame extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.start_game);
Intent i = getIntent();
TextView numOfPlayersVal = (TextView) findViewById(R.id.txt2);
numOfPlayersVal.setText(i.getStringExtra("Player number"));
}
}
Where is the error happening? I've set the input keyboard to take only numbers
1. you forgot to initialize youe editext first initialize it in your SelectNumberOfPlayers Activity
numberOfPlayers = (EditText) findViewById(R.id.numberOfPlayers);
2.
the key must be same to pass and receive data with intent
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.start_game);
Intent i = getIntent();
TextView numOfPlayersVal = (TextView) findViewById(R.id.txt2);
numOfPlayersVal.setText(i.getStringExtra("players"));
}
I have made this code :
public class MainActivity extends AppCompatActivity {
private ImageButton ourButton;
private EditText operand1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Find Views by IDs :
ourButton = (ImageButton) findViewById(R.id.gobutton);
operand1 = (EditText) findViewById(R.id.edit_Name);
String ed_text = operand1.getText().toString().trim();
if(ed_text.isEmpty() || ed_text.length() == 0 || ed_text.equals("") || ed_text == null)
{
ourButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(MainActivity.this, "You did not enter a username", Toast.LENGTH_LONG).show();
}
});
}
else
{
ourButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent myIntent = new Intent(MainActivity.this, ScreenName.class);
MainActivity.this.startActivity(myIntent);
}
});
}
}
The problem is that if I pressed the button with or without entering anything in the field, it will say :
You did not enter a username
And the next activity will not work neither.
How do I make the button to move the user into the next activity while making sure he inputed a name?
Use this, I have modified your code..
public class MainActivity extends AppCompatActivity {
private ImageButton ourButton;
private EditText operand1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Find Views by IDs :
ourButton = (ImageButton) findViewById(R.id.gobutton);
operand1 = (EditText) findViewById(R.id.edit_Name);
ourButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String ed_text = operand1.getText().toString().trim();
if(ed_text.equals(""))
{
Toast.makeText(MainActivity.this, "You did not enter a username", Toast.LENGTH_LONG).show();
}
else
{
Intent myIntent = new Intent(MainActivity.this, ScreenName.class);
MainActivity.this.startActivity(myIntent);
}
}
});
}
You need to do the check when the button is pressed, here is an example:
public class MainActivity extends AppCompatActivity {
private ImageButton ourButton;
private EditText operand1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Find Views by IDs :
ourButton = (ImageButton) findViewById(R.id.gobutton);
operand1 = (EditText) findViewById(R.id.edit_Name);
ourButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(operand1.getText().length() == 0){
Toast.makeText(MainActivity.this, "You did not enter a username", Toast.LENGTH_LONG).show();
}else{
Intent myIntent = new Intent(MainActivity.this, ScreenName.class);
MainActivity.this.startActivity(myIntent);
}
}
});
}
}
The problem is that you are not checking the value in the listener. Change it to this:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Find Views by IDs :
ourButton = (ImageButton) findViewById(R.id.gobutton);
operand1 = (EditText) findViewById(R.id.edit_Name);
ourButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (operand1.getText().toString().trim().length() > 0) {
Intent myIntent = new Intent(MainActivity.this, ScreenName.class);
MainActivity.this.startActivity(myIntent);
} else {
Toast.makeText(MainActivity.this, "You did not enter a username", Toast.LENGTH_LONG).show();
}
}
});
}
Also onCreate gets called when the Activity is created so you can't check the name field's value in there. That's why you need to move that check in your button's click listener. Then it will always check if the name field is empty when you click your button.
You can try this code:
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
private ImageButton ourButton;
private EditText operand1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Find Views by IDs :
ourButton = (ImageButton) findViewById(R.id.gobutton);
operand1 = (EditText) findViewById(R.id.edit_Name);
ourButton.setOnClickListener(this);
}
#Override
public void onClick(View v) {
int id = v.getId();
if (id == R.id.gobutton) {
if(operand1.getText().toString().trim().equals("")){
Toast.makeText(MainActivity.this, "You did not enter a username", Toast.LENGTH_LONG).show()
}else{
Intent myIntent = new Intent(this,ScreenName.class);
startActivity(myIntent);
}
}
}
Try this instead...
public class MainActivity extends AppCompatActivity {
private ImageButton ourButton;
private EditText operand1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Find Views by IDs :
ourButton = (ImageButton) findViewById(R.id.gobutton);
operand1 = (EditText) findViewById(R.id.edit_Name);
String ed_text = operand1.getText().toString().trim();
ourButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(ed_text.isEmpty() || ed_text.length() == 0 || ed_text.equals("") || ed_text == null) {
Toast.makeText(MainActivity.this, "You did not enter a username", Toast.LENGTH_LONG).show();
} else {
Intent myIntent = new Intent(MainActivity.this, ScreenName.class);
MainActivity.this.startActivity(myIntent);
}
});
}
}
you can use this
public class MainActivity extends AppCompatActivity {
private ImageButton ourButton;
private EditText operand1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Find Views by IDs :
ourButton = (ImageButton) findViewById(R.id.gobutton);
operand1 = (EditText) findViewById(R.id.edit_Name);
String ed_text = operand1.getText().toString();
ourButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(ed_text.equalsignorcase("")
{
Toast.makeText(MainActivity.this, "You did not enter a username", Toast.LENGTH_LONG).show();
}
else
{
Intent myIntent = new Intent(MainActivity.this, ScreenName.class);
MainActivity.this.startActivity(myIntent);
}
});
}
cahnge your code like that
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
private ImageButton ourButton;
private EditText operand1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Find Views by IDs :
ourButton = (ImageButton) findViewById(R.id.gobutton);
operand1 = (EditText) findViewById(R.id.edit_Name);
ourButton.setOnClickListener(this);
}
#Override
public void onClick(View view) {
String ed_text = operand1.getText().toString().trim();
if(ed_text.equals("")){
Toast.makeText(MainActivity.this, "You did not enter a username", Toast.LENGTH_LONG).show()
}else{
Intent myIntent = new Intent(MainActivity.this, ScreenName.class);
MainActivity.this.startActivity(myIntent);
}
}
}
Don't set two OnClickListeners for one button
Try following code -
String ed_text = operand1.getText().toString().trim();
ourButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(!TextUtils.isEmpty(ed_text)){
Toast.makeText(MainActivity.this, "Not Empty", Toast.LENGTH_SHORT).show();
Intent myIntent = new Intent(MainActivity.this, ScreenName.class);
startActivity(myIntent);
finish(); //If you want to kill current Activity.
}else{
Toast.makeText(MainActivity.this, "Empty", Toast.LENGTH_SHORT).show();
}
}
});
Hope it will help :)
When app starts at first, start Activity with two button: Create File and Settings. Then if I click on button Create File - start Activity where I write text and save in file.
If we have error when file saved - start activity with two button. Else start another Activity with three buttons: Look file, Edit File, Settings.
How organize correct transitions between this Activity and How start activity with three buttons if file already saved?
public class MainFirstActivity extends AppCompatActivity {
private Button createFile;
private Button settings;
private boolean start = true;
private static final String MY_SETTINGS = "my_settings";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_first);
createFile = (Button) findViewById(R.id.create_file);
settings = (Button) findViewById(R.id.settings);
createFile.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainFirstActivity.this, CreateFileActivity.class);
startActivity(intent);
// MainFirstActivity.this.finish();
}
});
settings.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainFirstActivity.this, SettingActivity.class);
startActivity(intent);
}
});
}
#Override
protected void onResume() {
super.onResume();
File f = new File(CreateFileActivity.FILE_NAME);
if(!f.exists() && !f.isDirectory() && start) {
Intent intent = new Intent(MainFirstActivity.this, MainWithFileActivity.class);
startActivity(intent);
//start=false;
MainFirstActivity.this.finish();
Log.e("err", "intent");
}
}
}
MainWithFileActivity
public class MainWithFileActivity extends AppCompatActivity {
public static final String MY_SETTINGS = "MY_SETTINGS";
private Button lookFile;
private Button editFile;
private Button settings;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_if_first);
lookFile = (Button) findViewById(R.id.look_file);
settings = (Button) findViewById(R.id.settings);
editFile = (Button) findViewById(R.id.edit_file);
lookFile.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainWithFileActivity.this, LookFileActivity.class);
startActivity(intent);
}
});
editFile.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainWithFileActivity.this,CreateFileActivity.class);
startActivity(intent);
}
});
settings.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainWithFileActivity.this, SettingActivity.class);
startActivity(intent);
}
});
}
}
Simply check if the file exists. If it does not, hide the lookFile button
Add this in your MainWithFileActivity onCreate method
File f = new File(CreateFileActivity.FILE_NAME);
if(!f.exists() && !f.isDirectory()) {
lookFile.setVisibility(View.GONE);
}