I am having trouble passing data read from a text file to another class in the app. I can read from the file just fine, but I think I need to use Bundle, but I'm not sure how to do it. I would like to have the second class handle the data from the text file, and then display it in the first class.
Edit: I've figured out how to pass the string from the file using an intent. I'm still working on getting some of the bugs out.
2nd Edit: I know there is a more efficient way of doing this. The only way I can get it to work is to have the first button in MainActivity use startActivity(intent) to allow secondActivity to bundle the string read from the file.
MainActivity.java:
public class MainActivity extends Activity {
Button btn;
Button bReadFile;
TextView tvRead;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn = (Button) findViewById(R.id.btnNext);
bReadFile = (Button) findViewById(R.id.btnRead);
tvRead = (TextView) findViewById(R.id.tvMain);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
//trying to find a way to remove this button
Intent intent = new Intent(MainActivity.this, econdActivity.class);
startActivity(intent);
}
});
bReadFile.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
String value = getIntent().getExtras().getString("key");
tvRead.setText(value);
}
});
}
}
secondActivity.java:
public class secondActivity extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent mIntent = new Intent(secondActivity.this, MainActivity.class);
mIntent.putExtra("key", readDataFile());
startActivity(mIntent);
}
public String readDataFile() {
String strData = null;
InputStream is = null;
try {
is = getResources().openRawResource(R.raw.data_text);
BufferedReader br = new BufferedReader(new InputStreamReader(is));
strData = br.readLine();
is.close();
} catch (IOException e) {
e.printStackTrace();
}
return strData;
}
}
Use the below edited code for your requirement
MainActivity.java
public class MainActivity extends Activity {
Button btn;
Button bReadFile;
TextView tvRead;
String value;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn = (Button) findViewById(R.id.btnNext);
bReadFile = (Button) findViewById(R.id.btnRead);
tvRead = (TextView) findViewById(R.id.tvMain);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
//trying to find a way to remove this button
Intent intent = new Intent(MainActivity.this, secondActivity.class);
startActivityForResults(intent,0);
}
});
bReadFile.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
tvRead.setText(value);
}
});
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data){
value = data.getStringExtra("key");
}
}
the code for secondActivity.java
public class secondActivity extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent i = new Intent();
i.putExtra("key", readDataFile());
setResult(RESULT_OK, i);
finish();
}
public String readDataFile() {
String strData = null;
InputStream is = null;
try {
is = getResources().openRawResource(R.raw.data_text);
BufferedReader br = new BufferedReader(new InputStreamReader(is));
strData = br.readLine();
is.close();
} catch (IOException e) {
e.printStackTrace();
}
return strData;
}
}
Related
Hi, why this code working "onCreate" but don`t working in the button
Realy I use not more then 20Mb, but for testing I inserted 90Mb
public class MainActivity extends AppCompatActivity {
TextView textView; DataInputStream textFileStream = null;
public void readbigtext(){
try {
textFileStream = new DataInputStream(getAssets().open(String.format("test1.txt")));
} catch (IOException e) {e.printStackTrace();}
Scanner sc = new Scanner(textFileStream);
while (sc.hasNextLine()) {textView.append(sc.nextLine());}
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button bigbutton = (Button) findViewById(R.id.bigbutton);
textView = (TextView) findViewById(R.id.bigfile);
textView.append("test begin");
//90Mb here IS WORKING!
// readbigtext();
bigbutton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//90Mb here DON`T WORKING
readbigtext();
}
});
}
}
I am new to Android development. I have an app in which the user creates multiple names (as if they were players of a game). These "players" appear as a matrix is used in the same activity. (Being possible here to exclude any player).
I want to display all of these players (MainActivity) in another activity (Main2Activity), showing only the first player added and, clicking a button, switch to the second player.
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
RecyclerView recyclerView;
TextView textAdd;
EditText etAdd;
ArrayList<Model> models = new ArrayList<Model>();
MyAdapter myAdapter;
int position;
Button prox;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
prox = findViewById(R.id.prox);
prox.setOnClickListener(new View.OnClickListener() {
//next screen
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, Main2Activity.class);
String nome = etAdd.getText().toString();
intent.putExtra("value", nome);
startActivity(intent);
}
});
recyclerView = findViewById(R.id.recyclerView);
textAdd = findViewById(R.id.text_adicionar);
etAdd = findViewById(R.id.et_Adicionar);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new GridLayoutManager(this, 3));
myAdapter = new MyAdapter(getApplicationContext(),
models, new MyAdapter.Onclick() {
#Override
public void onEvent(Model model, int pos) {
position = pos;
etAdd.setText(model.getId());
}
});
recyclerView.setAdapter(myAdapter);
textAdd.setOnClickListener(this);
}
public void onClick(View view) {
switch (view.getId()) {
case R.id.text_adicionar: {
insertItem(String.valueOf(etAdd.getText()));
}
break;
}
}
private void insertItem(String name) {
Gson gson = new Gson();
try {
JSONObject jsonObject = new JSONObject();
jsonObject.put("name", name);
Model model = gson.fromJson(String.valueOf(jsonObject), Model.class);
models.add(model);
myAdapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
}
public class Main2Activity extends AppCompatActivity implements View.OnClickListener {
Button play;
TextView text_player_name;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
play = findViewById(R.id.play);
text_player_name = findViewById(R.id.text);
play.setOnClickListener(this);
}
public void onClick(View view) {
switch (view.getId()) {
case R.id.play: {
String name = getIntent().getExtras().getString("value");
text_player_name.setText(String.valueOf(name));
}
break;
}
}
}
I'm not sure if I fully understand your question, but are you just looking for a way to pass data from one Activity to another?
If so, use .putExtra() with your Intent for starting the next Activity.
In the onCreate method for your second Activity, use .getExtras() to retrieve the data.
In 1st Activity
Intent intent = new Intent(this, Activity2.class);
intent.putExtra("DataName", data);
startActivity(intent);
In the 2nd Activity
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game);
String[] dataArray = getIntent().getExtras().get("DataName"));
}
EDIT:
public class Main2Activity extends AppCompatActivity implements View.OnClickListener {
Button play;
TextView text_player_name;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
play = findViewById(R.id.play);
text_player_name = findViewById(R.id.text);
play.setOnClickListener(this);
}
#Override
public void onClick(View v) {
String name = getIntent().getExtras().getString("value");
text_player_name.setText(String.valueOf(name));
}
Starting Intent then calling Method?
In the two classes, the second one has a StartIntent. Right now it simply starts the intent to the first class. I am wanting to know if it is possible from that same onClickListener to essentially StartIntent for the first class as usual, but then immediately call the defaultMap() method within it.
Sometimes I want to simply start the intent normally, and other times I want to start the intent and then call that method. 1) therefore, I can't just make so that OnCreate of the first class it calls defaultMap, because i don't always want to call it. But also 2) I don't want to JUST call the defaultMap() class. I need to call the full class so that it runs through the onCreate functions THEN goes to the defaultMap
FIRST CLASS USED
public class Daily_Schedule extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_daily__schedule);
......
.......
......
}
public void defaultMap(){
......
.......
......
}
SECOND CLASS USED
public class InRouteDisplay extends AppCompatActivity implements OnMapReadyCallback {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_in_route_display);
home.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent myIntent = new Intent(InRouteDisplay.this, DailySchedule.class);
InRouteDisplay.this.startActivity(myIntent);
}
});
.....
....
.....
}
Try the following: Two ways: 1) Using putExtra() -------- 2) Using SharedPreferences
1)
Demo4.class:-----------
public class Demo4 extends AppCompatActivity {
private Button b;
private final String CALL_DEFAULT_MAP = "call_default_map";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_daily__schedule);
if(getIntent() != null) {//1
if(getIntent().getStringExtra(CALL_DEFAULT_MAP) != null) {
if (getIntent().getStringExtra(CALL_DEFAULT_MAP).equals("true")) {
defaultMap();
}
}
}
b = (Button) findViewById(R.id.b);
b.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent myIntent = new Intent(Demo4.this, Demo5.class);
finish();
startActivity(myIntent);
}
});
}
public void defaultMap() {
Toast.makeText(getApplicationContext(),"defaultMap()---called",Toast.LENGTH_LONG).show();
}
}
Demo5.class------
public class Demo5 extends AppCompatActivity {
private Button home;
private final String CALL_DEFAULT_MAP = "call_default_map";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_in_route_display);
home = (Button) findViewById(R.id.home);
home.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent myIntent = new Intent(Demo5.this, Demo4.class);
myIntent.putExtra(CALL_DEFAULT_MAP,"true");//1
finish();
startActivity(myIntent);
}
});
}
}
2)
Demo4.class---------
public class Demo4 extends AppCompatActivity {
private Button b;
private final String CALL_DEFAULT_MAP = "call_default_map";
private SharedPreferences p;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_daily__schedule);
p = getApplicationContext().getSharedPreferences("p_key",
0);//2
if(p != null){//2
if(p.getBoolean(CALL_DEFAULT_MAP , false)){
defaultMap();
}
}
b = (Button) findViewById(R.id.b);
b.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent myIntent = new Intent(Demo4.this, Demo5.class);
finish();
startActivity(myIntent);
}
});
}
public void defaultMap() {
setBoolean(CALL_DEFAULT_MAP , false);//2
Toast.makeText(getApplicationContext(),"defaultMap()---called",Toast.LENGTH_LONG).show();
}
public void setBoolean(String Name, boolean value)
{
if(p != null){
SharedPreferences.Editor editor = p.edit();
editor.putBoolean(Name, value);
editor.apply();
}
}
}
Demo5.class:----------------
public class Demo5 extends AppCompatActivity {
private Button home;
private final String CALL_DEFAULT_MAP = "call_default_map";
private SharedPreferences p;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_in_route_display);
p = getApplicationContext().getSharedPreferences("p_key",
0);
home = (Button) findViewById(R.id.home);
home.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
setBoolean(CALL_DEFAULT_MAP , true);//2
Intent myIntent = new Intent(Demo5.this, Demo4.class);
finish();
startActivity(myIntent);
}
});
}
public void setBoolean(String Name, boolean value)
{
if(p != null){
SharedPreferences.Editor editor = p.edit();
editor.putBoolean(Name, value);
editor.apply();
}
}
}
No. The sending class doesn't get an instance of the Activity to call it on. What you can do is set a parameter in the intent, USE_DEFAULT_MAP to 1. The activity you launch can look for that variable, and use that to know that it should call defaultMap.
Use if statement inside the Daily_Schedule activity and check the extra whether they are set or null. Use getIntent() method. check the answer of this
From InRouteDisplay activity pass the intent data using putextra before calling InRouteDisplay.this.startActivity(myIntent);
Use this link to how to putextra data to the intent
Use this link's answer to know how to putextra data to the intent
I have an activity that is suppose to finish itself and close the application. Now, in certain cases, which are varying on how the user is navigating to the activity, the activity is getting stacked. When the activity is stacking up, then calling finish() or android.os.Process.killProcess(android.os.Process.myPid()); or both together is only showing up the same activity again.
The Manifest:
<activity
android:name="newActivities.HomeActivity"
android:label="#string/title_activity_home"
android:screenOrientation="portrait">
</activity>
The activity:
public class HomeActivity extends Activity {
private EditText studentNameEdittext;
private Button startYourStoryButton, loginButton, navCollegesButton, settingsButton, search_friends_button, browseStoriesButton;
private TextView textView1;
#Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
// if (getFromPreference("loginStatus").equalsIgnoreCase("true")) {
// finish();
// saveInPreference("loginStatus", "");
// }
// Set up the action bar
ActionBar bar = getActionBar();
bar.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#009945")));
bar.setTitle("Study Story");
bar.setIcon(R.drawable.statusbar_icon);
int titleId = getResources().getIdentifier("action_bar_title", "id", "android");
TextView yourTextView = (TextView) findViewById(titleId);
yourTextView.setTextColor(getResources().getColor(R.color.white_colour));
yourTextView.setTypeface(TypeFaceController.titleFace(HomeActivity.this));
// studentNameEdittext = (EditText)
// findViewById(R.id.studentNameEdittext);
startYourStoryButton = (Button) findViewById(R.id.startYourStoryButton);
// loginButton = (Button) findViewById(R.id.loginButton);
navCollegesButton = (Button) findViewById(R.id.navCollegesButton);
// settingsButton = (Button) findViewById(R.id.settingsButton);
// search_friends_button = (Button)
// findViewById(R.id.search_friends_button);
browseStoriesButton = (Button) findViewById(R.id.browseStoriesButton);
// textView1 = (TextView) findViewById(R.id.textView1);
// Set up font type
// studentNameEdittext.setTypeface(TypeFaceController.generalTextFace(HomeActivity.this));
startYourStoryButton.setTypeface(TypeFaceController.titleFace(HomeActivity.this));
// loginButton.setTypeface(TypeFaceController.titleFace(HomeActivity.this));
navCollegesButton.setTypeface(TypeFaceController.titleFace(HomeActivity.this));
// settingsButton.setTypeface(TypeFaceController.titleFace(HomeActivity.this));
// search_friends_button.setTypeface(TypeFaceController.titleFace(HomeActivity.this));
browseStoriesButton.setTypeface(TypeFaceController.titleFace(HomeActivity.this));
// textView1.setTypeface(TypeFaceController.titleFace(HomeActivity.this));
startYourStoryButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0){
Intent i = new Intent(HomeActivity.this, SignUp.class);
i.putExtra("signUpCaller", "Home");
startActivity(i);
}
});
// loginButton.setOnClickListener(new View.OnClickListener() {
//
// #Override
// public void onClick(View arg0){
// Intent i = new Intent(HomeActivity.this, Login.class);
// startActivity(i);
// }
// });
// search_friends_button.setOnClickListener(new View.OnClickListener() {
//
// #Override
// public void onClick(View v){
// Intent i = new Intent(HomeActivity.this,
// FindStudentBrowseStoryActivity.class);
// i.putExtra("Button", "search_friends_button");
// i.putExtra("searchString", studentNameEdittext.getText().toString());
// startActivity(i);
//
// }
// });
browseStoriesButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v){
Intent i = new Intent(HomeActivity.this, FindStudentBrowseStoryActivity.class);
i.putExtra("Button", "browseStoriesButton");
startActivity(i);
}
});
navCollegesButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v){
Intent i = new Intent(HomeActivity.this, CollegeListActivity.class);
startActivity(i);
}
});
// settingsButton.setOnClickListener(new View.OnClickListener() {
//
// #Override
// public void onClick(View v){
// Intent i = new Intent(HomeActivity.this, HomeSettingsActivity.class);
// i.putExtra("FromActivity", "HomeSettingsActivity");
// startActivity(i);
// finish();
//
// }
// });
}
// #Override
// protected void onStart(){
// if (getFromPreference("loginStatus").equalsIgnoreCase("true")) {
// finish();
// }
// super.onStart();
// }
//
// #Override
// protected void onResume(){
// if (getFromPreference("loginStatus").equalsIgnoreCase("true")) {
// finish();
// }
// super.onResume();
// }
// =========Login button action bar
#Override
public boolean onCreateOptionsMenu(Menu menu){
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.home_menu, menu);
return true;
}
// =========Login button action bar
#Override
public boolean onOptionsItemSelected(MenuItem item){
// handle item selection
switch (item.getItemId()) {
case R.id.home_login_string:
Intent i = new Intent(HomeActivity.this, Login.class);
// finish();
startActivity(i);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
// logic to fix logout
#Override
public void onBackPressed(){
// Intent startMain = new Intent(Intent.ACTION_MAIN);
// startMain.addCategory(Intent.CATEGORY_HOME);
// startMain.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);;
// startActivity(startMain);
//
// int pid = android.os.Process.myPid(); //
// android.os.Process.killProcess(pid); // return; }
android.os.Process.killProcess(android.os.Process.myPid());
finish();
}
// method to save variable in preference
public void saveInPreference(String name, String content){
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
SharedPreferences.Editor editor = preferences.edit();
editor.putString(name, content);
editor.commit();
}
// getting content from preferences
public String getFromPreference(String variable_name){
String preference_return;
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
preference_return = preferences.getString(variable_name, "");
return preference_return;
}
}
Please tell me where am I going wrong? Why is the activity stacking?
P.S: We cannot use single top etc as it causes some transition issues with the existing custom theme!
Take one application class which extends Application and take one arrayList and maintain the references of the activities in the arraylist.
When you click on back button in desired activity then finish the all the activities using arraylist.
Take one base activity. Which is super class of all the activities
public class BaseActviity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
App application = (App) getApplication();
application.addActivity(this);
}
}
Take one application class
public class App extends Application {
public App() {
if (listActivty == null) {
listActivty = new ArrayList<BaseActviity>();
}
}
public ArrayList<BaseActviity> listActivty;
public void addActivity(BaseActviity actviity) {
if (!listActivty.contains(actviity)) {
listActivty.add(actviity);
}
}
}
take 4 samples activity classes like ......
1) public class FirstActivity extends BaseActviity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.first);
}
public void send(View view) {
Intent intent = new Intent(this, SecondActivity.class);
startActivity(intent);
}
}
2) public class SecondActivity extends BaseActviity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.first);
}
public void send(View view) {
Intent intent = new Intent(this, ThirdActivity.class);
startActivity(intent);
}
}
3).........................
4) ............................
in 4 th activity class placed the following code
In desire activity that means final activity,override the onBackPressed
public void onBackPressed() {
super.onBackPressed();
App application = (App) getApplication();
ArrayList<BaseActviity> listActivty = application.listActivty;
for (BaseActviity actviity : listActivty) {
actviity.finish();
}
}
Wherever you are opening the activity which is getting stacked up, use this:
intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
Check if the Activity, that would be last activity when user clicks on the back button,is visible or not and if visible use
System.exit(0);
At last, the problem is solved. I has to do a little trick:
ParseUser.getCurrentUser();
ParseUser.logOut();
Intent i = new Intent(getActivity(), NewHomeActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
getActivity().startActivity(i);
getActivity().finish();
This did not cause any transition issues as well.
i have an app that has a int called Money and i .putExtra it to go to another class but every time i push the button to go to that class it forces close the app.
here is the code i used to send the int
int Money = 0;
GoToSettings.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(getApplicationContext(), settings.class);
intent.putExtra("money",Money);
startActivity(intent);
}
});
and here is where i receive it and try to save it
public class settings extends Activity {
int LoadDef = 0;
Button Save,Load,ClsSave;
Intent intent = getIntent();
int Money = intent.getIntExtra("money", 0);
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.settings);
Save = (Button) findViewById(R.id.Save);
Load = (Button) findViewById(R.id.Load);
ClsSave = (Button) findViewById(R.id.ClsSave);
Save.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
SharedPreferences sharedPreferences=getSharedPreferences("MoneySave", Context.MODE_PRIVATE);
SharedPreferences.Editor editor=sharedPreferences.edit();
editor.putInt("MoneySave", Money);
editor.commit();
}
});
could someone help me fine out why it forces close?
The problem is here :
Intent intent = getIntent();
you should get extra from your intent , in onCreate() not in class definition
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.settings);
Intent intent = getIntent();
int Money = intent.getIntExtra("money", 0);