I am creating a simple tasklist app in Android Studios.
I have two activities as following (removed imports and package specifications):
MainActivity.java
public class MainActivity extends AppCompatActivity implements View.OnClickListener, AdapterView.OnItemClickListener {
EditText taskAdd;
Button add;
public ListView tasks;
public Integer pos = 0;
public ArrayList<String> taskArray;
public ArrayAdapter<String> adapter;
#Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
taskAdd = findViewById(R.id.taskAdd);
add = findViewById(R.id.add);
tasks = findViewById(R.id.tasks);
taskArray = FileHelper.readData(this);
adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, taskArray);
tasks.setAdapter(adapter);
add.setOnClickListener(this);
tasks.setOnItemClickListener(this);
}
#Override
public void onClick(View v) {
switch(v.getId()){
case R.id.add:
String entered = taskAdd.getText().toString();
if (entered != "" || entered != null || entered != "null") {
adapter.add(entered);
taskAdd.setText("");
FileHelper.writeData(taskArray, this);
Toast.makeText(this, "Task Added!", Toast.LENGTH_SHORT).show();
}
break;
}
}
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
pos = position;
Intent intent = new Intent(MainActivity.this, Pop.class);
startActivity(intent);
}
#Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
setIntent(intent);
processExtraData();
}
private void processExtraData(){
Bundle extras = getIntent().getExtras();
if (extras != null) {
int value = extras.getInt("Value");
if (value == 1) {
taskArray.remove(pos);
adapter.notifyDataSetChanged();
Toast.makeText(this, "Task Removed!", Toast.LENGTH_SHORT).show();
}
}
}
}
Pop.java (a popup)
public class Pop extends Activity implements View.OnClickListener {
Button deleteButton;
Button finishedButton;
Button timerButton;
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.popwindow);
deleteButton = findViewById(R.id.deleteButton);
DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
int width = dm.widthPixels;
int height = dm.heightPixels;
getWindow().setLayout((int)(width*0.5),(int)(height*0.5));
deleteButton.setOnClickListener(this);
}
#Override
public void onClick(View v) {
Intent i = new Intent(this, MainActivity.class);
i.putExtra("Value", 1);
startActivity(i);
}
}
After I click deleteButton in Pop.java, processExtraData in MainActivity.java is supposed to run. The Toast does appear, but the selected object in the ListView is not deleted. No errors are thrown either. In addition, using Log.d to check the size of taskArray confirmed that this is not just a graphical issue. Why is this the case, and how should I go about fixing it?
Thank you for replying in advance.
The issue is that you are using an object reference instead of a primitive data type, and so when you are calling taskArray.remove(pos), it is looking for pos the object rather than its denoted integer value.
Instead of:
taskArray.remove(pos);
try:
taskArray.remove(pos.intValue());
public class CheatActivity extends AppCompatActivity {
private static final String EXTRA_ANSWER_IS_TRUE="com.example.ferhat.geoquiz.answer_is_true";
public static final String EXTRA_ANSWER_SHOWN="com.example.ferhat.geoquiz.answer_shown";
private static final String CHEATER="com.example.ferhat.geoquiz.cheated";
private Boolean mAnswerIsTrue;
private TextView mAnswerTextView;
private Button mShowAnswer;
private Boolean mIsCheater;
public static Intent newIntent(Context packageContext, boolean answerIsTrue){
Intent i=new Intent(packageContext,CheatActivity.class);
i.putExtra(EXTRA_ANSWER_IS_TRUE,answerIsTrue);
return i;
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cheat);
mAnswerIsTrue = getIntent().getBooleanExtra(EXTRA_ANSWER_IS_TRUE, false);
mAnswerTextView = (TextView) findViewById(R.id.answerTextView);
mShowAnswer = (Button) findViewById(R.id.showAnswerButton);
mShowAnswer.setOnClickListener(new View.OnClickListener() {
//Cevabı gösteriyor ve Kopya çekildi bilgisi veriliyor
#Override
public void onClick(View v) {
if (mAnswerIsTrue) {
mAnswerTextView.setText(R.string.true_button);
} else {
mAnswerTextView.setText(R.string.false_button);
}
mIsCheater=true;
setAnswerShownResult();
}
});
if(savedInstanceState!=null){
mIsCheater=savedInstanceState.getBoolean(CHEATER,false);
}
}
private void setAnswerShownResult(){
Intent data=new Intent();
data.putExtra(EXTRA_ANSWER_SHOWN,mIsCheater);
setResult(RESULT_OK,data);
}
#Override
public void onSaveInstanceState(Bundle savedInstanceState){
super.onSaveInstanceState(savedInstanceState);
savedInstanceState.putBoolean(CHEATER,mIsCheater);
}
}
I try to solve challenge in Anroid Programming, Big Nerds Ranch Guide (Chap.5)
Challenge asks me to keep Cheat data while rotation of screen and transaction between questions.Main Activity holds questions and CheatActivity has answers from Main activity. And i created BooleanArray to hold cheat data for questions.
Problem is ,i cheated for first question and then when i am in the CheatActivity(CheatPage) of other questions ,program crashes if i rotate the screen.
Error caused by this line savedInstanceState.putBoolean(CHEATER,mIsCheater);
i think i need to clear data from previous Cheat Data(BooleanArray already holding it) but i dont know how to do it.
public class CheatActivity extends AppCompatActivity {
private static final String EXTRA_ANSWER_IS_TRUE = "com.example.ferhat.geoquiz.answer_is_true";
public static final String EXTRA_ANSWER_SHOWN = "com.example.ferhat.geoquiz.answer_shown";
public static final String EXTRA_CHEATED = "com.example.ferhat.geoquiz.cheated";
private static final String CHEATER = "com.example.ferhat.geoquiz.cheated";
private Boolean mAnswerIsTrue;
private TextView mAnswerTextView;
private Button mShowAnswer;
private Boolean mAnswerEverShown;
private Boolean twoStep=false;
//Yeni intent methodu yarattık Cevabı alıyor ve bu activity i başlatıyor
public static Intent newIntent(Context packageContext, boolean answerIsTrue, boolean checked) {
Intent i = new Intent(packageContext, CheatActivity.class);
i.putExtra(EXTRA_ANSWER_IS_TRUE, answerIsTrue);
i.putExtra(EXTRA_CHEATED, checked);
return i;
}
private void setAnswerShownResult(Boolean isAnswerShown) {
Intent data = new Intent();
**if(mAnswerEverShown) {
isAnswerShown=mAnswerEverShown;
data.putExtra(EXTRA_ANSWER_SHOWN, isAnswerShown);
setResult(RESULT_OK, data);
}else {
data.putExtra(EXTRA_ANSWER_SHOWN, isAnswerShown);
setResult(RESULT_OK, data);
}
twoStep=isAnswerShown;**
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cheat);
mAnswerIsTrue = getIntent().getBooleanExtra(EXTRA_ANSWER_IS_TRUE, false);
mAnswerTextView = (TextView) findViewById(R.id.answerTextView);
**mAnswerEverShown = getIntent().getBooleanExtra(EXTRA_CHEATED, false);**
mShowAnswer = (Button) findViewById(R.id.showAnswerButton);
mShowAnswer.setOnClickListener(new View.OnClickListener() {
//Cevabı gösteriyor ve Kopya çekildi bilgisi veriliyor
#Override
public void onClick(View v) {
if (mAnswerIsTrue) {
mAnswerTextView.setText(R.string.true_button);
} else {
mAnswerTextView.setText(R.string.false_button);
}
twoStep=true;
setAnswerShownResult(twoStep);
}
});
**if (savedInstanceState != null) {
setAnswerShownResult(savedInstanceState.getBoolean(CHEATER, false));
}
}
#Override
public void onSaveInstanceState (Bundle savedInstanceState){
super.onSaveInstanceState(savedInstanceState);
savedInstanceState.putBoolean(CHEATER, twoStep);
}
}**
i found solution like for every situation.
first think i did; i get info from main activity
mAnswerEverShown = getIntent().getBooleanExtra(EXTRA_CHEATED, false);
And Then i changed setAnswerShownResult for two situation.If it is not cheated ever program sends current data(cheated or not).
i marked where i changed with *.
You need to putBoolean before callback the super method.
#Override
public void onSaveInstanceState(Bundle savedInstanceState){
savedInstanceState.putBoolean(CHEATER,mIsCheater);
super.onSaveInstanceState(savedInstanceState);
}
if not the CHEATER won't be saved and you can't call it when resume activity
So, I've been struggling on this for a while and have searched on here for hours without finding anything that really helped. I have a custom class Streak. When the user creates a new Streak in my Main Activity, I want for that streak to be added to a list of total streaks, which I would then access from an AllStreaks activity. I have tried using Gson, but received errors. What I have below is working for the time being, but since my global variable has to be declared as new. I don't really want to use a MySQL database as this info needs to be quickly editable and I don't want to have to constantly connect to that to potentially change just one detail.
Sorry if my code is a mess or this makes no sense, I'm coming to realize I'm really shitty at programming anyway.
MainActivity.java:
public class MainActivity extends AppCompatActivity {
private SharedPreferences prefs;
private SharedPreferences.Editor editor;
private String userID;
private int streakCounter;
private int mainStreakCounter;
private RelativeLayout quickAdd;
private EditText quickSubmitStreak;
private Button quickSubmitButton;
private Button mainStreak1;
private Button mainStreak2;
private Button mainStreak3;
private Button mainStreak4;
private Button allStreaks;
private Button addStreak;
private Dialog pickDialog;
private Button healthButton;
private Button mentalButton;
private Button personalButton;
private Button professionalButton;
private Button socialButton;
private Button submitStreakButton;
private TextView todaysDate;
private EditText chooseDate;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
/*
Creates shared preferences and editor
*/
prefs = getSharedPreferences("carter.streakly", MODE_PRIVATE);
editor = prefs.edit();
// Checks if it's the first time the user opens the app. If so, generates a unique user ID and stores it in shared prefs
if (prefs.getBoolean("firstTime", true)){
userID = UUID.randomUUID().toString();
editor.putString("user", userID);
editor.putBoolean("firstTime", false);
editor.commit();
}
streakCounter = 0; // CHANGE TO streakCounter = prefs.getInt("streakCounter", 0) later
mainStreakCounter = 0; // CHANGE TO mainStreakCount = prefs.getInt("mainStreakCounter", 0) later
quickSubmitStreak = (EditText) findViewById(R.id.enter_goal);
quickSubmitButton = (Button) findViewById(R.id.submit_button);
mainStreak1 = (Button) findViewById(R.id.main_goal_1);
mainStreak2 = (Button) findViewById(R.id.main_goal_2);
mainStreak3 = (Button) findViewById(R.id.main_goal_3);
mainStreak4 = (Button) findViewById(R.id.main_goal_4);
allStreaks = (Button) findViewById(R.id.main_goal_5);
addStreak = (Button) findViewById(R.id.add_streak_button);
/*
if (streakCounter > 4){
quickAdd.setVisibility(View.INVISIBLE);
}
mainStreak1.setText(prefs.getString("mainKeyOne", ""));
mainStreak2.setText(prefs.getString("mainKeyTwo", ""));
mainStreak3.setText(prefs.getString("mainKeyThree", ""));
mainStreak4.setText(prefs.getString("mainKeyFour", ""));
/*
Sets the text to the lowest unused main streak to the inputted streak name
Stores the streak name in shared prefs so it will be there for next time app opens
Increases the total streak count
*/
quickSubmitButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (mainStreakCounter < 4){
switch(mainStreakCounter){
case 0:
mainStreak1.setText(quickSubmitStreak.getText().toString());
editor.putString("mainKeyOne", quickSubmitStreak.getText().toString()).commit();
break;
case 1:
mainStreak2.setText(quickSubmitStreak.getText().toString());
editor.putString("mainKeyTwo", quickSubmitStreak.getText().toString()).commit();
break;
case 2:
mainStreak3.setText(quickSubmitStreak.getText().toString());
editor.putString("mainKeyThree", quickSubmitStreak.getText().toString()).commit();
break;
case 3:
mainStreak4.setText(quickSubmitStreak.getText().toString());
editor.putString("mainKeyFour", quickSubmitStreak.getText().toString()).commit();
break;
default:break;
}
}
mainStreakCounter++;
AllStreaks.streakList.add(new Streak(quickSubmitStreak.getText().toString()));
// ADD THESE TO SHARED PREFERENCES AT SOME POINT
}
});
/*
Brings user to the All Streaks activity, and passes the LinkedList<Streak> streakList
*/
allStreaks.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(MainActivity.this, AllStreaks.class);
startActivity(intent);
}
});
/*
Shows an Alert Dialog that allows users to enter in the type of streak they want
*/
addStreak.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
createCustomDialog();
}
});
}
private void createCustomDialog(){
pickDialog = new Dialog(MainActivity.this);
pickDialog.setContentView(R.layout.dialog_add_streak);
final EditText chooseName = (EditText) pickDialog.findViewById(R.id.dialog_acitivty_name);
healthButton = (Button) pickDialog.findViewById(R.id.dialog_health);
mentalButton = (Button) pickDialog.findViewById(R.id.dialog_mental);
personalButton = (Button) pickDialog.findViewById(R.id.dialog_personal);
professionalButton = (Button) pickDialog.findViewById(R.id.dialog_professional);
socialButton = (Button) pickDialog.findViewById(R.id.dialog_social);
submitStreakButton = (Button) pickDialog.findViewById(R.id.dialog_submit_button);
todaysDate = (TextView) pickDialog.findViewById(R.id.dialog_today);
chooseDate = (EditText) pickDialog.findViewById(R.id.dialog_input_date);
pickDialog.show();
healthButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
editor.putInt("AddCategory", 0).commit();
editor.putString("Category", "Health");
editor.commit();
recolorCategory();
}
});
mentalButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
editor.putInt("AddCategory", 1).commit();
editor.putString("Category", "Mental");
editor.commit();
recolorCategory();
}
});
personalButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
editor.putInt("AddCategory", 2).commit();
editor.putString("Category", "Personal");
editor.commit();
recolorCategory();
}
});
professionalButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
editor.putInt("AddCategory", 3).commit();
editor.putString("Category", "Professional");
editor.commit();
recolorCategory();
}
});
socialButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
editor.putInt("AddCategory", 4).commit();
editor.putString("Category", "Social");
editor.commit();
recolorCategory();
}
});
todaysDate.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
todaysDate.setTextColor(Color.rgb(51,51,255));
chooseDate.setTextColor(Color.rgb(0,0,0));
editor.putInt("todayOrChosen", 1).commit();
}
});
chooseDate.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
chooseDate.setTextColor(Color.rgb(51,51,255));
todaysDate.setTextColor(Color.rgb(0,0,0));
editor.putInt("todayOrChosen", 2).commit();
}
});
submitStreakButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
/*
If the user selected today's date, enter the days kept as 0. If the user selected how long they've kept the streak for, enter the days kept as chooseDate
*/
if(prefs.getInt("todayOrChosen", 1) == 1){
//streakList.add(new Streak(chooseName.getText().toString(), prefs.getString("Category", ""),
//new SimpleDateFormat("dd-MM-yyyy").format(new Date()), 0));
AllStreaks.streakList.add(new Streak(chooseName.getText().toString(), prefs.getString("Category", ""),
new SimpleDateFormat("dd-MM-yyyy").format(new Date()), 0));
}
else {
//streakList.add(new Streak(chooseName.getText().toString(), prefs.getString("Category", ""),
//new SimpleDateFormat("dd-MM-yyyy").format(new Date()), Integer.parseInt(chooseDate.getText().toString())));
AllStreaks.streakList.add(new Streak(chooseName.getText().toString(), prefs.getString("Category", ""),
new SimpleDateFormat("dd-MM-yyyy").format(new Date()), Integer.parseInt(chooseDate.getText().toString())));
}
/*
Update streakList in Shared Preferences
*/
/*
Display an Alert Dialog indicating that a streak has been added
*/
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setMessage("Streak Added")
.setPositiveButton("OK", null)
.create()
.show();
pickDialog.dismiss();
}
});
}
/*
Highlights which category is currently chosen
*/
private void recolorCategory(){
Button[] categoryList = {healthButton, mentalButton, personalButton, professionalButton, socialButton};
int recolorIndex = prefs.getInt("AddCategory", 0);
categoryList[recolorIndex].setTextColor(Color.rgb(51,51,255));
for (int i = 0; i < 5; i++){
if (i != recolorIndex) categoryList[i].setTextColor(Color.rgb(153, 255, 102));
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
AllStreaks.java:
public class AllStreaks extends AppCompatActivity {
public static ArrayList<Streak> streakList = new ArrayList<>();
private SharedPreferences prefs;
private SharedPreferences.Editor editor;
private ArrayList<Streak> allStreakList;
private TableLayout mTableLayout;
private TableRow mTableRow;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_all_streaks);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
/*
if (streakList == null){
Button streakButton = new Button(this);
streakButton.setText("Try again");
}
else{
for (int j = 0; j < streakList.size(); j++){
allStreakList.add(streakList.get(j));
}
}*/
prefs = getSharedPreferences("carter.streakly", MODE_PRIVATE);
editor = prefs.edit();
mTableLayout = (TableLayout) findViewById(R.id.all_streak_table);
int i = 0;
while (i < streakList.size()){
if (i % 2 == 0){
mTableRow = new TableRow(this);
mTableLayout.addView(mTableRow);
}
Button streakButton = new Button(this);
streakButton.setText(String.valueOf(streakList.get(i).getDaysKept()));
streakButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(AllStreaks.this, EnlargedActivity.class);
startActivity(intent);
}
});
mTableRow.addView(streakButton);
i++;
}
}
}
you cannot pass object directly.you have to parcelable or serialize it. but in parecelable is part of android where serialzation is part of java so i suggest you to use parcelable.
you can make model class to parcelable from this link if you dont want to code for parcelabel.
parcelable creator
you can achieve like this.
class Car implements Parcelable {
public int regId;
public String brand;
public String color;
public Car(Parcel source) {
regId = source.getInt();
brand = source.getString();
color = source.getString();
}
public Car(int regId, String brand, String color) {
this.regId = regId;
this.brand = brand;
this.color = color;
}
public int describeContents() {
return this.hashCode();
}
public void writeToParcel(Parcel dest, int flags) {
dest.writeInt(regId);
dest.writeString(brand);
dest.writeString(color);
}
public static final Parcelable.Creator CREATOR
= new Parcelable.Creator() {
public Car createFromParcel(Parcel in) {
return new Car(in);
}
public Car[] newArray(int size) {
return new Car[size];
}
};}
And you can pass it like below.
ArrayList carList = new ArrayList();
carList.add(new Car('1','Honda','Black');
carList.add(new Car('2','Toyota','Blue');
carList.add(new Car('3','Suzuki','Green');
Intent i = new Intent(getApplicationContext(), CarDetailActivity.class);
i.putParcelableArrayListExtra("cars", carList);
this.startActivity(i);
you can get it like below:
Intent i = this.getIntent();
ArrayList<Car> carList = (ArrayList<Car>)i.getParcelableArrayListExtra("cars");`
You need to use Parcelable or Serializable interface.
and the pass it with intent
Intent mIntent = new Intent(context, ResultActivity.class);
mIntent.putParcelableArrayListExtra("list", mArraylist);
startActivity(mIntent);
fetch it in ResultActivity
Bundle bundle = getIntent().getExtras();
mArraylist1 = bundle.getParcelableArrayList("list");
Check this thread for reference
Do this on your Streak class and try,
Streak implements Parcelable
Since your modal class has not serialized, it may not able to pass via bundle. You can do that by implementing the Parcelable interface.
Parcelable is an Android specific interface where you implement the
serialization yourself. It was created to be far more efficient that
Serializable, and to get around some problems with the default Java
serialization scheme.
Serializable is a standard Java interface. You simply mark a class
Serializable by implementing the interface, and Java will
automatically serialize it in certain situations.
Courtsy
I have search a lot in different sites to solve this problem but I can't till now.
I have a simple app with 50 articles, two buttons, previous and next.
All works fine till the last article 50 where the problem is that the user can't choose the previous button 49, only can load from the beginning.
Here is my code: MainActivity.java
public class MainActivity extends AppCompatActivity {
private TextView meditCenterText;
private Button mStartButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
meditCenterText = (TextView) findViewById(R.id.editCenterText);
mStartButton = (Button) findViewById(R.id.startButton);
meditCenterText.setMovementMethod(new ScrollingMovementMethod());
mStartButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String TextView = meditCenterText.getText().toString();
startStory(TextView);
}
});
}
private void startStory(String TextView) {
Intent intent = new Intent(this, StoryActivity.class);
intent.putExtra("TextView", TextView);
startActivity(intent);
}
#Override
protected void onResume() {
super.onResume();
meditCenterText.setText("..... ");
}}
StoryActivity.java
public class StoryActivity extends AppCompatActivity {
public static final String TAG = StoryActivity.class.getSimpleName();
private Story mStory = new Story();
private ImageView mImageView;
private TextView mTextView;
private Page mCurrentPage;
private String mName;
private Button mPreviousButton;
private Button mNextButton;
private ScrollView mScrollView;
private Button mStartButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_story2);
//Intent intent = getIntent();
//mName = intent.getStringExtra(getString(R.string.key_name));
if(mName == null){
mName = "";
}
Log.d(TAG, mName);
mImageView = (ImageView)findViewById(R.id.storyImageView);
mTextView = (TextView)findViewById(R.id.storyTextView);
mPreviousButton = (Button)findViewById(R.id.previousButton);
mNextButton = (Button)findViewById(R.id.nextButton);
mTextView.setMovementMethod(new ScrollingMovementMethod());
loadPage(0);
}
private void loadPage(int choice){
mCurrentPage = mStory.getPage(choice);
Drawable drawable = getResources().getDrawable(mCurrentPage.getImageId());
mImageView.setImageDrawable(drawable);
String pageText = mCurrentPage.getText();
//add the name if placeholder included.
//pageText = String.format(pageText,mName);
mTextView.setText(pageText);
if(mCurrentPage.isSingle()){
mPreviousButton.setVisibility(View.VISIBLE);
mNextButton.setText("Start From The Beginning");
mNextButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
mPreviousButton.setVisibility(View.VISIBLE);
loadPage(0);
}
});
}else{
mPreviousButton.setText(mCurrentPage.getChoices().getText1());
mNextButton.setText(mCurrentPage.getChoices().getText2());
mPreviousButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
int previousPage = mCurrentPage.getChoices().getPreviousPage();
loadPage(previousPage);
}
});
mNextButton.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v) {
int nextPage = mCurrentPage.getChoices().getNextPage();
loadPage(nextPage);
}
});
}}
}
Thanks for help.
It's probably the logic in your Page class. Have a proper look at it, otherwise from the android side everything is alright. One last thing, you should probably use a ViewPager for your app instead of changing the text every time you load a new oage
I have a class in which a string is taken from an input. I want to use the value of the input in a second class.
public class Incontrare extends ActionBarActivity {
public static String nome1=null;
public String variabileNome;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_incontrare);
Button button1 = (Button) findViewById(R.id.button1Nome);
button1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
alertDia(); //takes the input from variabileNome
nome1 = variabileNome;
TextView textv1 = (TextView) findViewById(R.id.textView1);
textv1.setText(nome1);
}
});
public static String getNome1() {return nome1;}
}
}
And the second class:
public class IncontrarePersona1 extends ActionBarActivity {
String nome1=Incontrare.getNome1();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_incontrare_persona1);
b1=(Button)findViewById(R.id.play);
b1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String toPrint = "There is " + nome1;
Toast.makeText(getApplicationContext(), toPrint, Toast.LENGTH_SHORT).show();
}
});
}
I tried the second class also in this way:
public class IncontrarePersona1 extends ActionBarActivity {
String nome1=Incontrare.getNome1();
public static String no1;
b1=(Button)findViewById(R.id.play);
b1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Incontrare no1= new Incontrare();
String n1= no1.nome1;
String toPrint = "There is " + nome1;
Toast.makeText(getApplicationContext(), toPrint, Toast.LENGTH_SHORT).show();
}
});
}
Where is the mistake? Why do I get always null?
Any help is appreciated. Thanks :)
If you are jumping from activity to another use Bundle.
Bundle example -
Set value
Intent i = new Intent();
i.setClass(this, IncontrarePersona1.class);
i.putExtra("text", "some text");
startActivity(i);
Get Value:
Bundle extras = getIntent().getExtras();
if (extras != null)
{
String data= extras.getString("text");
//data is your param
}
Otherwise use static class with static variables as Will McG said.
I think the issue is that when the second Activity is brought into focus, the data in the previous Activity is lost.
Create a separate class to hold your static variables that both Activitys can access.
Edit:
Another method I use for passing data is the SharedPreferences if I'm worried about the entire application losing focus.