Make HTML anchor links start a new activity in Android Java - java

I have a String that contains HTML tags which I display in a TextView
Spanned text;
String htmlText = "<p dir=\"ltr\">It was a great day with Julius and Stanley</p>";
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N)
text = Html.fromHtml(htmlText, Html.FROM_HTML_MODE_COMPACT);
else
text = Html.fromHtml(htmlText);
textView.setText(text);
Now I want those links to be clickable, and not just clickable, but to startup an Activity when clicked. The href attributes have numbers which I want to pass as a parameter to my Intent to start my Activity.
I use JSoup to extract the values of the href like this:
Document doc = Jsoup.parse(htmlText, "UTF-8");
Elements elements = doc.getElementsByTag("a");
for(int e = 0; e < elements.size(); e++){
Element element = elements.get(e);
String href = element.attr("href");
}
So I was hoping I can get a ClickEventListener on the links and start the activity like this:
element.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(context, NewActivity.class);
Bundle userParams = new Bundle();
userParams.putString("userId", href);
intent.putExtras(userParams);
startActivity(intent);
}
});
I know element is not a ViewGroup so it can't be done like my code shows, but is there any possible way of achieving this?

Search and I got an answer from here
String htmlText = "<p dir=\"ltr\">It was a great day with Julius and Stanley</p>";
CharSequence sequence = Html.fromHtml(htmlText);
SpannableStringBuilder strBuilder = new SpannableStringBuilder(sequence);
URLSpan[] urls = strBuilder.getSpans(0, sequence.length(), URLSpan.class);
for(URLSpan span : urls) {
makeLinkClickable(strBuilder, span);
}
textView.setText(strBuilder);
textView.setMovementMethod(LinkMovementMethod.getInstance());
And then the makeLinkClickable method to handle the links
protected void makeLinkClickable(SpannableStringBuilder strBuilder, final URLSpan span){
int start = strBuilder.getSpanStart(span);
int end = strBuilder.getSpanEnd(span);
int flags = strBuilder.getSpanFlags(span);
ClickableSpan clickable = new ClickableSpan() {
public void onClick(View view) {
String href span.getURL();
Intent intent = new Intent(context, NewActivity.class);
Bundle userParams = new Bundle();
userParams.putString("userId", href);
intent.putExtras(userParams);
startActivity(intent);
}
};
strBuilder.setSpan(clickable, start, end, flags);
strBuilder.removeSpan(span);
}

Related

How can I prevent null from displaying in the TextView?

Very new to Android, and I'm honestly stumped by this.
So I have my MainActivity receiving some strings from a second activity, CallAnActivity.
I've made an intent to pass the strings back to the main activity, and they are displayed in a TextView. But before I enter any information, I would like for this text view to contain nothing and look blank.
But when the MainActivity is first launched, the text view, displayMessageActivity, is displaying multiple null values. As there are three strings being sent, it just repeats the word null three times.
The code for the MainActivity is:
//callAnActivityButton to open second activity of app
Button callAnActivityButton = findViewById(R.id.callActivityButton);
callAnActivityButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick( View v ) {
Intent intent = new Intent(MainActivity.this, CallAnActivity.class);
startActivity(intent);
}
});
Intent intent = getIntent();
String emailAddress = intent.getStringExtra("emailAddress") + "\n";
String emailSubject = intent.getStringExtra("emailSubject") + "\n";
String emailBody = intent.getStringExtra("emailBody");
//TextView to display text from second activity
TextView displayMessageText = findViewById(R.id.displayMessageText);
displayMessageText.setText(emailAddress + emailSubject + emailBody);
The code for the second activity, CallAnActivity, is:
public void sendText(){
String emailAddress = mEditTextAddress.getText().toString();
String emailSubject = mEditTextSubject.getText().toString();
String emailBody = mEditTextBody.getText().toString();
Intent intent = new Intent(CallAnActivity.this, MainActivity.class);
intent.putExtra("emailAddress", emailAddress);
intent.putExtra("emailSubject", emailSubject);
intent.putExtra("emailBody", emailBody);
startActivityForResult(intent, REQUEST_CODE);
}
#Override
protected void onCreate( Bundle savedInstanceState ) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_call_an);
mEditTextAddress = findViewById(R.id.emailAddressText);
mEditTextSubject = findViewById(R.id.emailSubjectText);
mEditTextBody = findViewById(R.id.emailBodyText);
Button sendTextButton = findViewById(R.id.sendMailButton);
sendTextButton.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick (View v) {
sendText();
}
});
}
Just surround your setText call with an if block:-
if (intent.getStringExtra("emailAddress") != null) {
displayMessageText.setText(emailAddress + emailSubject + emailBody);
}
Change your content like below. Your getExtra syntaxs are wrong
String emailAddress = intent.getExtras().getStringExtra("emailAddress") + "\n";
String emailSubject = intent.getExtras().getStringExtra("emailSubject") + "\n";
String emailBody = intent.getExtras().getStringExtra("emailBody");

How to store intent inside the android local database?

I'm having problem in storing the intent.putExtra inside the android local database. I am creating a game like 4Pics1Word for my project. It has only 25 levels so I created 25 activities and I randomized it. After solving a particular activity, it will then be removed to the ArrayList of Classes, ArrayList<Class>. Now, I used intent.putExtra("ACTIVITY_LIST", activityList); to store the intent and to pass it to the next activity. My problem is I can't store it on local database. When I exit the game the progress is not saved, it starts again from the first level. Any suggestions? Thank you!
Here's my code in my Main Activity:
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
Button btnStart;
Context context;
SharedPreferences mPrefs = getPreferences(MODE_PRIVATE);
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btnStart = (Button) findViewById(R.id.btnStart);
btnStart.setOnClickListener(this);
}
#Override
public void onClick(View v) {
// We are creating a list, which will store the activities that haven't been opened yet
ArrayList<Class> activityList = new ArrayList<>();
activityList.add(first.class);
activityList.add(second.class);
activityList.add(third.class);
activityList.add(fourth.class);
activityList.add(fifth.class);
Random generator = new Random();
int number = generator.nextInt(5) + 1;
Class activity = null;
switch(number) {
case 1:
activity = first.class;
activityList.remove(first.class);
break;
case 2:
activity = second.class;
activityList.remove(second.class);
break;
case 3:
activity = third.class;
activityList.remove(third.class);
break;
case 4:
activity = fourth.class;
activityList.remove(fourth.class);
break;
default:
activity = fifth.class;
activityList.remove(fifth.class);
break;
}
Intent intent = new Intent(getBaseContext(), activity);
intent.putExtra("ACTIVITY_LIST", activityList);
SharedPreferences.Editor prefsEditor = mPrefs.edit();
Gson gson = new Gson();
String json = gson.toJson(activityList); // myObject - instance of MyObject
prefsEditor.putString("MyObject", json);
prefsEditor.commit();
startActivity(intent);
}
}
Here's my code in my first activity:
public class first extends AppCompatActivity implements View.OnClickListener{
EditText etAnswer;
Button btnGo;
Context context;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_first);
etAnswer = (EditText) findViewById(R.id.etAnswer);
btnGo = (Button) findViewById(R.id.btnGo);
btnGo.setOnClickListener(this);
}
#Override
public void onClick(View v) {
switch(v.getId()){
case R.id.btnGo:
String answer = etAnswer.getText().toString();
if(answer.equals("Jose Rizal") || answer.equals("jose rizal") || answer.equals("Rizal") || answer.equals("rizal") ){
AlertDialog.Builder dlgAlert = new AlertDialog.Builder(this);
dlgAlert.setMessage("The famous Rizal monument in Luneta was not the work of a Filipino but a Swiss sculptor named Richard Kissling?" +
"\n" +
"\n" +
"Source: http://www.joserizal.ph/ta01.html");
dlgAlert.setTitle("Did you know that ...");
dlgAlert.setPositiveButton("Next",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
ArrayList<Class> activityList = new ArrayList<>();
Bundle extras = getIntent().getExtras();
activityList = (ArrayList<Class>) extras.get("ACTIVITY_LIST");
if(activityList.size() == 0) {
Context context = getApplicationContext();
CharSequence last = "Congratulations! You just finished the game! Please wait for the next update!";
int durationFinal = Toast.LENGTH_LONG;
Toast toast = Toast.makeText(context, last, durationFinal);
toast.show();
} else {
// Now, the random number is generated between 1 and however many
// activities we have remaining
Random generator = new Random();
int number = generator.nextInt(activityList.size()) + 1;
Class activity = null;
// Here, we are checking to see what the output of the random was
switch(number) {
case 1:
// We will open the first remaining activity of the list
activity = activityList.get(0);
// We will now remove that activity from the list
activityList.remove(0);
break;
case 2:
// We will open the second remaining activity of the list
activity = activityList.get(1);
activityList.remove(1);
break;
case 3:
// We will open the third remaining activity of the list
activity = activityList.get(2);
activityList.remove(2);
break;
case 4:
// We will open the fourth remaining activity of the list
activity = activityList.get(3);
activityList.remove(3);
break;
default:
// We will open the fifth remaining activity of the list
activity = activityList.get(4);
activityList.remove(4);
break;
}
// Note: in the above, we might not have 3 remaining activities, for example,
// but it doesn't matter because that case wouldn't be called anyway,
// as we have already decided that the number would be between 1 and the number of
// activities left.
// Starting the activity, and passing on the remaining number of activities
// to the next one that is opened
Intent intent = new Intent(getBaseContext(), activity);
intent.putExtra("ACTIVITY_LIST", activityList);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
}
}
});
dlgAlert.setCancelable(true);
dlgAlert.create().show();
}else{
Context context = getApplicationContext();
CharSequence text = "Wrong! Try Again.";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, text, duration);
toast.show();
}
break;
}
}
}
Everytime you come to MainActivity , you new an ArrayList and add all the activities rather than get the cache from your local SharedPreferences .
When you finish one game in an Activity , you did not save your progress in cache.
After updating the arrayList,save your arrayList like this :
SharedPreferences.Editor prefsEditor = mPrefs.edit();
Gson gson = new Gson();
String json = gson.toJson(activityList); // myObject - instance of MyObject
prefsEditor.putString("MyObject", json);
prefsEditor.commit();
And when you want to read the arrayList saved ,do like this:
String arrayStr = mPrefs.getString("myObject","defValue");
Gson gson = new Gson();
List<Class> array = gson.fromGson(arrayStr,new TypeToken<List<Class>>(){}.getType());
if(array==null){
array = new ArrayList<>();
array.add(...);
}

How can I create two activities (one or the other) dynamically via button click?

I have an activity that loads text views into it. I add a click listener to these text views and want them to open up an activity with different values based on what I click. It ends up that no matter which I click, the same results show up, and more precisely, I use the same info in creating it - which I don't want to do.
public void setTextToTextView (JSONArray jsonArray)
{
RelativeLayout layout = (RelativeLayout) findViewById(R.id.activity_main);
String s = "";
for (int i = 0; i < jsonArray.length(); i++) {
TextView info = new TextView(this); //actually really confused as to what the context I'm setting is - why this? Just saw other people do it like so
JSONObject json = null;
try {
json = jsonArray.getJSONObject(i);
s = s + "ID : " + json.getString("Id") + " Parent: " + json.getString("Parent") +
" Content: " + json.getString("Content") + " User: " + json.getString("User") +
" Timestamp: " + json.getString("Timestamp") + "\n\n";
} catch (JSONException e) {
e.printStackTrace();
}
info.setText(s);
try {
info.setId(Integer.parseInt(json.getString("Id")));
} catch (JSONException e) {
e.printStackTrace();
}
info.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent myIntent = new Intent(MainActivity.this,
NewActivity.class);
myIntent.putExtra("key", v.getId()); //this is always the same
startActivity(myIntent);
}
});
layout.addView(info);
}
}
Using two text views, this results in the ID of the second view to always be the value of the key,value pair in the activity I start. I'm not sure what I'm doing wrong at the moment. I believe my problem is in this section, as I can't see where else it might come from.
Any help or suggestions on my code in general would be welcomed. Thank you.
This still isn't solved, so I'll focus on the problem area:
info.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent myIntent = new Intent(MainActivity.this,
NewActivity.class);
myIntent.putExtra("key", v.getId()); //this is always the same
startActivity(myIntent);
}
});
No matter what changes I make, this will always give me the exact same v.getId/v.getTag - every time.
I create a new project with your code but the result is correct just as what you hope.Are you sure that your third TextView does not cover the previous ones?
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
LinearLayout layout = (LinearLayout)findViewById(R.id.activity_main);
int [] a = {1,2};
String [] s = {"textView1","textView2"};
for(int i =0; i <a.length; i++)
{
TextView info = new TextView(this); //actually really confused as to what the context I'm setting is - why this? Just saw other people do it like so
info.setText(s[i]);
info.setId(a[i]);
info.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
Toast.makeText(getApplicationContext(),
"clicked:"+v.getId(),Toast.LENGTH_SHORT).show();
Intent myIntent = new Intent(MainActivity.this,
NewActivity.class);
myIntent.putExtra("key", v.getId()); //this is always the same
startActivity(myIntent);
}
});
layout.addView(info);
}
The gif:
As a first step, I would move the OnclickListener to outsdie the loop, as it always does the same thing:
View.OnClickListener view_ocl = new View.OnClickListener() {
#Override
public void onClick(View v)
{
Intent myIntent = new Intent(MainActivity.this, NewActivity.class);
myIntent.putExtra("key", v.getId()); //this is always the same
startActivity(myIntent);
}};
for(int i =0; i <jsonArray.length(); i++)
{
// ... as before
info.setOnClickListener(view_ocl);
layout.addView(info);
}
As you do, you need to explicitly set the Id, or in some way put an identifier in the view so that your onClick code (which is the same for each View), knows which View has been clicked. At the moment you are reliant on whatever arbitrary Id the system gives to the view.

setText on button from another activity android

I have a problem, I want to click on the list, calling a new activity and rename the button to another name.
I tried several things, nothing worked, can someone please help me?
My class EditarTimes:
private AdapterView.OnItemClickListener selecionarTime = new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView arg0, View arg1, int pos, long id) {
t = times.get(pos);
CadastroTimes cad = new CadastroTimes();
CadastroTimes.salvar.setText("Alterar");
Intent intent = new Intent(EditarTimes.this, CadastroTimes.class);
startActivity(intent);
}
};
public class CadastroTimes extends AppCompatActivity {
private Time t;
private timeDatabase db;
private EditText edID;
private EditText edNome;
public Button salvar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cadastro_times);
edID = (EditText) findViewById(R.id.edID);
edNome = (EditText) findViewById(R.id.edNome);
db = new timeDatabase(getApplicationContext());
salvar = (Button) findViewById(R.id.btnCadastrar);
salvar.setText("Cadastrar");
String newString;
if (savedInstanceState == null) {
Bundle extras = getIntent().getExtras();
if(extras == null) {
newString= null;
} else {
newString= extras.getString("Alterar");
}
} else {
newString= (String) savedInstanceState.getSerializable("Alterar");
}
//button in CadastroTimes activity to have that String as text
System.out.println(newString + " AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA");
salvar.setText(newString);
}
public void salvarTime(View v) {
t = new Time();
t.setNome(edNome.getText().toString());
if (salvar.getText().equals("Alterar")) {
db.atualizar(t);
exibirMensagem("Time atualizado com sucesso!");
} else {
db.salvar(t);
exibirMensagem("Time cadastrado com sucesso!");
}
Intent intent = new Intent(this, EditarTimes.class);
startActivity(intent);
}
private void limparDados() {
edID.setText("");
edNome.setText("");
edNome.requestFocus();
}
private void exibirMensagem(String msg) {
Toast.makeText(getApplicationContext(), msg, Toast.LENGTH_LONG).show();
}
}
public class EditarTimes extends AppCompatActivity {
private Time t;
private List<Time> times;
private timeDatabase db;
private ListView lvTimes;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_editar_times);
lvTimes = (ListView) findViewById(R.id.lvTimes);
lvTimes.setOnItemClickListener(selecionarTime);
lvTimes.setOnItemLongClickListener(excluirTime);
times = new ArrayList<Time>();
db = new timeDatabase(getApplicationContext());
atualizarLista();
}
private void excluirTime(final int idTime) {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Excluir time?")
.setIcon(android.R.drawable.ic_dialog_alert)
.setMessage("Deseja excluir esse time?")
.setCancelable(false)
.setPositiveButton(getString(R.string.sim),
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
if (db.deletar(idTime)) {
atualizarLista();
exibirMensagem(getString(R.string.msgExclusao));
} else {
exibirMensagem(getString(R.string.msgFalhaExclusao));
}
}
})
.setNegativeButton(getString(R.string.nao),
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
builder.create();
builder.show();
atualizarLista();
}
private void atualizarLista() {
times = db.listAll();
if (times != null) {
if (times.size() > 0) {
TimeListAdapter tla = new TimeListAdapter(
getApplicationContext(), times);
lvTimes.setAdapter(tla);
}
}
}
private AdapterView.OnItemClickListener selecionarTime = new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View arg1, int pos, long id) {
t = times.get(pos);
Intent intent = new Intent(EditarTimes.this, CadastroTimes.class);
String strName = "Alterar";
intent.putExtra("Alterar", strName);
startActivity(intent);
}
};
private AdapterView.OnItemLongClickListener excluirTime = new AdapterView.OnItemLongClickListener() {
public boolean onItemLongClick(AdapterView<?> arg0, View arg1,
int pos, long arg3) {
excluirTime(times.get(pos).getId());
return true;
}
};
private void exibirMensagem(String msg) {
Toast.makeText(getApplicationContext(), msg, Toast.LENGTH_LONG).show();
}
public void telaCadastrar(View view) {
Intent intent = new Intent(this, CadastroTimes.class);
startActivity(intent);
}
public void botaoSair(View view) {
Intent intent = new Intent(this, TelaInicial.class);
startActivity(intent);
}
}
You can pass the button caption to CadastroTimes with intent as
Intent intent = new Intent(EditarTimes.this, CadastroTimes.class);
intent.putExtra("buttontxt","Changed Text");
startActivity(intent);
Then in CadastroTimes.java set the text of the button to the new value that you passed. The code will look like:
button = (Button)findViewById(R.id.button); // This is your reference from the xml. button is my name, you might have your own id given already.
Bundle extras = getIntent().getExtras();
String value = ""; // You can do it in better and cleaner way
if (extras != null) {
value = extras.getString("buttontxt");
}
button.setText(value);
Do remember to do it in onCreate after setContentView
//From Activity
Intent intent = new Intent(EditarTimes.this, CadastroTimes.class);
intent.putExtra("change_tag", "text to change");
startActivity(intent);
//To Activity
public void onCreate(..){
Button changeButton = (Button)findViewById(R.id.your_button);
// Button to set received text
Intent intent = getIntent();
if(null != intent &&
!TextUtils.isEmpty(intent.getStringExtra("change_tag"))) {
String changeText = intent.getStringExtra("change_tag");
// Extracting sent text from intent
changeButton.setText(changeText);
// Setting received text on Button
}
}
1: Use intent.putExtra() to share a value from one activity another activity, as:
In ActivityOne.class :
startActivity(
Intent(
applicationContext,
ActivityTwo::class.java
).putExtra(
"key",
"value"
)
)
In ActivityTwo.class :
var value = ""
if (intent.hasExtra("key")
value = intent.getStringExtra("key")
2: Modify button text programatically as:
btn_object.text = value
Hope this will help you
For changing the button text:
Use a static method to call from the other activity to directly modify the button caption.
Use an intent functionality, which is preferable.
Use an Interface and implement it, which is used for communicating between activities or fragment in a manner of fire and forget principle.
Now, i got you:
Your EditarTimes activity with listview:
//set setOnItemClickListener
youtListView.setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,int position, long id) {
Intent i = new Intent(EditarTimes.this, CadastroTimes.class);
//text which you want to display on the button to CadastroTimes activity
String strName = "hello button";
i.putExtra("STRING_I_NEED", strName);
}
});
In CadastroTimes activity,
under onCreate() method, get the text string as:-
String newString;
if (savedInstanceState == null) {
Bundle extras = getIntent().getExtras();
if(extras == null) {
newString= null;
} else {
newString= extras.getString("STRING_I_NEED");
}
} else {
newString= (String) savedInstanceState.getSerializable("STRING_I_NEED");
}
//button in CadastroTimes activity to have that String as text
yourButton.setText(newString);
Ok, so the first step would be to take the button you want and make it a public static object (and put it at the top of the class).
public static Button button;
Then you can manipulate that using this in another class:
ClassName.button.setText("My Button");
In your case it is
CadastroTimes.salvar.setText("Alterar");
if you want to change value from that do not do not go the activity via intent you can use file to save value to file or you have multiple values the use database and access
the value oncreate to set the value of text....
In my case, I had to send an EditText value from a Dialog styled Activity, which then got retrieved from a Service.. My Example is similar to some of the above answers, which are also viable.
TimerActivity.class
public void buttonClick_timerOK(View view) {
// Identify the (EditText) for reference:
EditText editText_timerValue;
editText_timerValue = (EditText) findViewById(R.id.et_timerValue);
// Required 'if' statement (to avoid NullPointerException):
if (editText_timerValue != null) {
// Continue with Button code..
// Convert value of the (EditText) to a (String)
String string_timerValue;
string_timerValue = editText_timerValue.getText().toString();
// Declare Intent for starting the Service
Intent intent = new Intent(this, TimerService.class);
// Add Intent-Extras as data from (EditText)
intent.putExtra("TIMER_VALUE", string_timerValue);
// Start Service
startService(intent);
// Close current Activity
finish();
} else {
Toast.makeText(TimerActivity.this, "Please enter a Value!", Toast.LENGTH_LONG).show();
}
}
And then inside my Service class, I retrieved the value, and use it inside onStartCommand.
TimerService.class
// Retrieve the user-data from (EditText) in TimerActivity
intent.getStringExtra("TIMER_VALUE"); // IS THIS NEEDED, SINCE ITS ASSIGNED TO A STRING BELOW TOO?
// Assign a String value to the (EditText) value you retrieved..
String timerValue;
timerValue = intent.getStringExtra("TIMER_VALUE");
// You can also convert the String to an int, if needed.
// Now you can reference "timerValue" for the value anywhere in the class you choose.
Hopefully my contribution helps!
Happy coding!
Accessing view reference of another Activity is a bad practice. Because there is no guarantee if the reference is still around by the time you access it (considering the null reference risk).
What you need to do is to make your other Activity read values (which you want to display) from a data source (e.g. persistence storage or shared preferences), and the other Activity manipulates these values. So it appears as if it changes the value of another activity, but in reality it takes values from a data source.
Using SharedPreferences:
Note: SharedPreferences saves data in the app if you close it but it will be lost when it has been deleted.
In EditarTimes.java:
private AdapterView.OnItemClickListener selecionarTime = new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView arg0, View arg1, int pos, long id) {
t = times.get(pos);
SharedPreferences.Editor editor = getSharedPreferences("DATA", MODE_PRIVATE).edit();
editor.putString("btnText", "Your desired text");
editor.apply();
Intent intent = new Intent(EditarTimes.this, CadastroTimes.class);
startActivity(intent);
}
};
In CadastroTimes.java
public Button salvar;
salvar.setText(getSharedPreferences("DATA", MODE_PRIVATE).getString("btnText", ""));
//note that default value should be blank
As far as my thoughts go, I can realize that the problem is not with the code you provided as it seems to be implemented correctly. It is possible that you have saved the activityState somewhere in your actual code and because it is not implemented properly, the savedInstanceState found in the onCreate method is not null but the required information is missing or not correct. That's why newString is getting null and salvar textview is getting blank.
Here, I need to know which one is more useful to you - information from getIntent() or from savedInstanceState? The code you provided insists me to assume that savedInstanceState has got the preference.
If you prefer savedInstanceState, then you may use SharedPreferences like this to get the same value you want:
private SharedPreferences mPrefs;
private String newString;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
........
// try to get the value of alterarValue from preference
mPrefs = getSharedPreferences("MyData", MODE_PRIVATE);
newString = mPrefs.getString("alterarValue", "");
if (newString.equals("")){
// we have not received the value
// move forward to get it from bundle
newString = getIntent().getStringExtra("Alterar");
}
// now show it in salvar
salvar.setText(newString);
}
protected void onPause() {
super.onPause();
// you may save activity state or other info in this way
SharedPreferences.Editor ed = mPrefs.edit();
ed.putString("alterarValue", newString);
ed.commit();
}
Or if you don't need to get it from savedInstanceState, please use it:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
........
// try to get the value of alterarValue from bundle
String newString = getIntent().getStringExtra("Alterar");
// now show it in salvar
salvar.setText(newString);
}
That's all I know. Hope it will help. If anything goes wrong, please let me know.

Next button opens another activity when its reaches the array limit

I am developing a quiz application with two navigation buttons (back and next), and each quiz has an array of 30 questions. Now when btnnext reaches the last question, it should open another activity(Review) when u click on it again
next = (Button)findViewById(R.id.next);
next.setVisibility(View.GONE);
next.setOnClickListener(nextListener);
private View.OnClickListener nextListener = new View.OnClickListener() {
public void onClick(View v) {
setAnswer();
quesIndex++;
if (quesIndex >= QuizFunActivity.getQuesList().length())
quesIndex = QuizFunActivity.getQuesList().length() - 1;
showQuestion(quesIndex,review);
}
};
next = (Button)findViewById(R.id.next);
next.setVisibility(View.GONE);
next.setOnClickListener(nextListener);
private View.OnClickListener nextListener = new View.OnClickListener() {
public void onClick(View v) {
setAnswer();
if (quesIndex != QuizFunActivity.getQuesList().length()-1) {
quesIndex++;
showQuestion(quesIndex,review);
}
else {
Intent myIntent = new Intent(CurrentActivity.this, NextActivity.class);
myIntent.putExtra("key", value); //Optional parameters
CurrentActivity.this.startActivity(myIntent);
}
if (quesIndex == QuizFunActivity.getQuesList().length()-1)
next.setText("Finish");
}
};
Add the piece of code for next activity
Intent myIntent = new Intent(CurrentActivity.this, NextActivity.class);
myIntent.putExtra("key", value); //Optional parameters
CurrentActivity.this.startActivity(myIntent);
You have to check for the last question and change the button view text to finish.

Categories