I am making a Form App that collects information and sends it in an email. MainActivity collects phone #, then to a warning message activity, then to Name Activity etc. The issue that I am having is sending the data collected from the EditText fields to the final AgreementActivity to be sent as an email is not working for me. I have looked everywhere but I cannot figure out how to send the user to the next activity while sending the input data to the final Agreement activity so it can be sent in an email.
This is what I have so far.
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Find the next button
final Button next1 = (Button) findViewById(R.id.button);
// Find the Edit Text Field to input Phone Number
final EditText phoneField = (EditText) findViewById(R.id.edit_text_phone);
// Set a click listener on the next button
next1.setOnClickListener(new View.OnClickListener() {
// The code in this method will be executed when the next1 Button is clicked on.
#Override
public void onClick(View view) {
// sends data collected from edit text box to be sent to final page so it can be
// sent in an email message.
Intent phoneNumber = new Intent(MainActivity.this, AgreementActivity.class);
phoneNumber.putExtra("phoneMessage", phoneField.getText().toString());
startActivity(phoneNumber);
//starts next activity
Intent nextButton = new Intent(MainActivity.this, Warning.class);
startActivity(nextButton);
}
});
}
}
This is the final Agreement Activity where it will send an email.
But the final result in the email subject line is "your phone number is null"
public class AgreementActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.agreement_activity);
// Find the submit button
final Button submit = (Button) findViewById(R.id.button6);
// This is the input from user for phone number field
final Bundle phoneNumber = getIntent().getExtras();
// Set a click listener on that View
submit.setOnClickListener(new View.OnClickListener() {
// The code in this method will be executed when the Submit Button is clicked on.
#Override
public void onClick(View view) {
Intent intent = new Intent(Intent.ACTION_SENDTO);
intent.setData(Uri.parse("mailto:"));
intent.getBundleExtra("phoneMessage");
intent.putExtra(Intent.EXTRA_SUBJECT, "Your Phone Number is " + phoneNumber);
if (intent.resolveActivity(getPackageManager()) != null) {
startActivity(intent);
}
}
});
}
}
In your AgreementActivity, get the phone number using:
final String phoneNumber = getIntent().getStringExtra("phoneMessage");
I would extend application class like this however you could find other ways. You do need to consider the backstack if someone navigates back arrow
Related
Main Activity
`public class MainActivity extends AppCompatActivity {
private Object Context;
public static final String MSG="com.mp.exampleapp.ORDER";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void createBirthdayCard(View view) {
EditText text = (EditText)findViewById(R.id.nameInput);
String str = text.getText().toString();
Toast.makeText(this, "Button was clicked "+str,Toast.LENGTH_LONG).show();
getIntent().putExtra(MSG,str);
startActivity(new Intent(this,birthdaygreeting.class)) ;
ImageView image=(ImageView) findViewById(R.id.cake);
image.setImageResource(R.drawable.wish);
}
`Second activity
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_birthdaygreeting);
Intent intent = getIntent();
String msg = "HAPPY BIRTHDAY "+intent.getStringExtra(MainActivity.MSG);
// receive the value by getStringExtra() method
// and key must be same which is send by first activity
TextView textView= (TextView)findViewById(R.id.textView2);
textView.setText(msg);
}
After running this program - after clicking the button- the message that's getting displayed is "HAPPY BIRTHDAY null". I don't know what's going wrong.
What is wrong?
The place where you are passing the put extra, is in getIntent(). This means that you are giving an intent extra to the previous activity.In this case, when you go back, and then get that extra, you will get it.But not on the next activity. Now you get null because that extra does not exist for that activity. So, it comes null.
How to solve?
Instead of using this
public void createBirthdayCard(View view) {
EditText text = (EditText)findViewById(R.id.nameInput);
String str = text.getText().toString();
Toast.makeText(this, "Button was clicked "+str,Toast.LENGTH_LONG).show();
getIntent().putExtra(MSG,str);
startActivity(new Intent(this,birthdaygreeting.class)) ;
ImageView image=(ImageView) findViewById(R.id.cake);
image.setImageResource(R.drawable.wish);
}
use this
public void createBirthdayCard(View view) {
EditText text = (EditText)findViewById(R.id.nameInput);
String str = text.getText().toString();
Toast.makeText(this, "Button was clicked "+str,Toast.LENGTH_LONG).show();
startActivity(new Intent(this,birthdaygreeting.class).putExtra(MSG,str)) ;
ImageView image=(ImageView) findViewById(R.id.cake);
image.setImageResource(R.drawable.wish);
}
How do I know it will help me?
It will help you because here in the new intent which you are giving, there the extra is being given. So, that value is being sent.
Create an intent then add your data in it like the code below.
public void createBirthdayCard(View view) {
EditText text = (EditText)findViewById(R.id.nameInput);
String str = text.getText().toString();
Toast.makeText(this, "Button was clicked "+str,Toast.LENGTH_LONG).show();
Intent intent = new Intent(this,birthdaygreeting.class);
intent.putExtra(MSG,str);
startActivity(intent) ;
ImageView image=(ImageView) findViewById(R.id.cake);
image.setImageResource(R.drawable.wish);
}
This is a snippet of my code. The Textview acts as buttons and have Onclicklistner on them. When cpu1000 Textview is clicked it leads to the cpu_g1000 class for which the code is shown below.
public class Game_1000 extends AppCompatActivity implements View.OnClickListener{
private TextView cpu1000, mobo1000;
TextView cpu, mobo;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game_1000);
cpu1000 = (TextView) findViewById(R.id.proName_G1);
mobo1000 = (TextView) findViewById(R.id.moboName_G1);
cpu1000.setOnClickListener(this);
mobo1000.setOnClickListener(this);
cpu = (TextView) findViewById(R.id.proNameG1000);
cpu.setText(getIntent().getStringExtra("Processor"));
mobo = (TextView) findViewById(R.id.moboNameG1000);
mobo.setText(getIntent().getStringExtra("Motherboard"));
}
#Override
public void onClick(View v) {
if (v == cpu1000) {
opencpu_g1000();
}
else if (v == mobo1000) {
openmobo_g1000();
}
}
public void opencpu_g1000() {
Intent intent = new Intent(this, cpu_g1000.class);
startActivity(intent);
}
public void openmobo_g1000() {
Intent intent = new Intent(this, mobo_g1000.class);
startActivity(intent);
}
In this class, there are radio buttons. The users choose one of the choices and the choice is changed to strings. The strings are sent back to Game_1000 class. The string then gets substituted with "Choose a processor" to show the new choice. The issue I am having is when I choose a motherboard the processor choice is reverted back to "Choose a processor" and the motherboard choice shows. I need both to show at the same time.
public class cpu_g1000 extends AppCompatActivity {
Button button_save;
RadioGroup rG;
TextView tv;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cpu_g1000);
button_save = (Button) findViewById(R.id.Save_G1_cpu);
rG = (RadioGroup) findViewById(R.id.cpu_RadioGrp);
tv = (TextView) findViewById(R.id.proNameG1000);
button_save.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
int selected_cpu = rG.getCheckedRadioButtonId();
RadioButton selectedRadioButton = (RadioButton) findViewById(selected_cpu);
String radioValue = selectedRadioButton.getText().toString();
Intent intent = new Intent(cpu_g1000.this, Game_1000.class);
intent.putExtra("Processor", radioValue);
startActivity(intent);
}
});
}
Processor is chosen:
Motherboard is chosen:
Example of choices:
The previous choice are not recored and when a new choice is made the previous choice reverts back to "Please choose a processor" but I need both of the information to show. In my original code, I have more than just 2 choices but I shortened it to make it easier to read.
Start your second (Selection) activity for result by calling startActivityForResult(...) and then when user completes the interaction set your selected data in an Intent and pass that intent to method with desired result setResult(...) then call finish on second activity.
After finishing the second activity you will receive intent data in onActivityResult(...) method of first activity, extract that data from intent and then show it to user.
More Description
Example
Try using Shared Preference. Here's a good tutorial.
For your scenario what you have to do is save Processor and Motherboard selection result or send data form one Activity to another Activity. As after processor selection you are returning to Game_1000 Activity you can use startActivityForResult. This method send back the result to calling Activity via Intent. Thats means if you call cpu_g1000 Activity from Game_1000 Activity and after selecting Processor you can send back the result to Game_1000 Activity. Game_1000 Activity will get the result in onActivityResult method.
Example:
Start cpu_g1000 Activity with startActivityForResult from Game_1000 Activity.
public void opencpu_g1000() {
Intent intent = new Intent(this, cpu_g1000.class);
startActivityForResult(intent, PROCESSOR_SELECTION_CODE);
}
In cpu_g1000 Activity set the result to intent and send back to Game_1000 Activity
button_save.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
int selected_cpu = rG.getCheckedRadioButtonId();
RadioButton selectedRadioButton = (RadioButton) findViewById(selected_cpu);
String radioValue = selectedRadioButton.getText().toString();
Intent resultIntent = new Intent();
// TODO Add data to send back
resultIntent.putExtra("ProcessorSelection", radioValue);
setResult(Activity.RESULT_OK, resultIntent);
// finishing this activity
finish();
}
});
In Game_1000 Activity get the value sent form cpu_g1000 Activity by overriding onActivityResult method.
#Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch(requestCode) {
case (PROCESSOR_SELECTION_CODE) : {
if (resultCode == Activity.RESULT_OK) {
// TODO Extract the data returned from the child Activity.
String radioValue = data.getStringExtra("ProcessorSelection");
// save the result value and update UI
}
break;
}
}
}
For mobo_g1000 Activity use same procedure to get the result back in Game_1000 Activity. Start mobo_g1000 Activity with startActivityForResult and get the value in Game_1000 Activity's onActivityResult method. You have to add another case in onActivityResult method for mobo_g1000 Activity.
Check this and this link for better understanding how this work.
So I am making a simple app. It's just basically making a list of win with a custom list view at the end.
It starts off on the main screen where there are two buttons, one is an "Add" button which takes you to the Add activity. If you push this it'll take you to a page where you type in the name,price, description of the wine and then hit a submit button to the list. The other button on the main screen is a "Go to List" button which just takes you directly to the list activity.
If I go through the Add button, add a wine, and then go to the list, it works fine. I can see the list. It even works if I don't add anything to the list. I can see the empty list activity.
When I push the "Go to List" button on the main screen though, it crashes and says "The application has stopped".
I don't get why I can go through the Add button to get to the list fine, but this button doesn't work at all.
Could I get some help?
Here are the three relevant activities, the AddActivity, the ListActivity, and the MainActivity.
AddActivity:
public class AddActivity extends AppCompatActivity {
EditText editWineName;
EditText editWinePrice;
EditText editWineDescription;
Button btnSubmit;
Button btnGoToList;
String stringWineName;
String stringWinePrice;
String stringWineDescription;
ArrayList<String> listWineName = new ArrayList<>();
ArrayList<String> listPrice = new ArrayList<>();
ArrayList<String> listWineDescription = new ArrayList<>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add);
setVariables();
btnSubmit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
setVariables();
listWineName.add(stringWineName);
listPrice.add(stringWinePrice);
listWineDescription.add(stringWineDescription);
Toast.makeText(AddActivity.this, stringWineName + " was added to the list.", Toast.LENGTH_SHORT).show();
clearEditText();
}
});
btnGoToList.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intentGoToList = new Intent(AddActivity.this,ListActivity.class);
intentGoToList.putStringArrayListExtra("WINENAME", listWineName);
intentGoToList.putStringArrayListExtra("WINEPRICE", listPrice);
intentGoToList.putStringArrayListExtra("WINEDESCRIPTION", listWineDescription);
startActivity(intentGoToList);
}
});
}
private void setVariables(){
editWineName = (EditText) findViewById(R.id.editName);
editWinePrice = (EditText) findViewById(R.id.editPrice);
editWineDescription = (EditText) findViewById(R.id.editDescription);
btnSubmit = (Button) findViewById(R.id.btnSubmit);
btnGoToList = (Button) findViewById(R.id.btnGoToList);
stringWineName = editWineName.getText().toString();
stringWinePrice = "$" + editWinePrice.getText().toString();
stringWineDescription = editWineDescription.getText().toString();
}
private void clearEditText() {
editWineName.getText().clear();
editWinePrice.getText().clear();
editWineDescription.getText().clear();
}
}
ListActivity:
public class ListActivity extends AppCompatActivity {
ListView wineList;
ArrayAdapter adapter;
Button btnBacktoMain;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list);
setVariables();
ArrayList<String> listWineName = getIntent().getStringArrayListExtra("WINENAME");
ArrayList<String > listWinePrice = getIntent().getStringArrayListExtra("WINEPRICE");
ArrayList<String> listWineDescription = getIntent().getStringArrayListExtra("WINEDESCRIPTION");
adapter = new CustomAdapter(this, listWineName, listWinePrice, listWineDescription);
wineList.setAdapter(adapter);
btnBacktoMain.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intentBackToMain = new Intent(ListActivity.this,MainActivity.class);
startActivity(intentBackToMain);
}
});
}
private void setVariables (){
btnBacktoMain = (Button) findViewById(R.id.btnBackToMain);
wineList = (ListView) findViewById(R.id.listWine);
}
}
MainActivity:
public class MainActivity extends AppCompatActivity {
Button btnAdd;
Button btnList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setVariables();
btnAdd.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) { //Goes to the add activity
Intent intentAdd = new Intent(MainActivity.this, AddActivity.class);
startActivity(intentAdd);
}
});
btnList.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) { //Goes to the list activity
Intent intentList = new Intent(MainActivity.this, ListActivity.class);
startActivity(intentList);
}
});
}
private void setVariables(){
btnAdd = (Button) findViewById(R.id.btnAddWine);
btnList = (Button) findViewById(R.id.btnViewList);
}
}
Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'int java.util.List.size()' on a null object reference
at android.widget.ArrayAdapter.getCount(ArrayAdapter.java:344)
at android.widget.ListView.setAdapter(ListView.java:493)
at com.example.jeremy.mywine.ListActivity.onCreate(ListActivity.java:33)
Your crash indicates that the data in the adapter given to the ListView in ListActivity is null. Make it not null. Start at ListActivity.java at line 33 and go backwards to find where you are (or this case are not) initializing the data in the list adapter.
In you case, you are expecting data in your intent. OK, where is your intent set up? In your MainActivity click. Well, there you just launch the activity without passing any data in the intent extras, hence there is nothing to pull out from the intent in ListActivity, hence your crash.
So you need to initialize the data in MainActivity and set it as extras in the Intent you use to launch ListActivity.
Since the ListActivity is expecting this:
ArrayList<String> listWineName = getIntent().getStringArrayListExtra("WINENAME");
ArrayList<String > listWinePrice = getIntent().getStringArrayListExtra("WINEPRICE");
ArrayList<String> listWineDescription = getIntent().getStringArrayListExtra("WINEDESCRIPTION");
You would update your MainActivity to do something like this (where getDescriptions() is a fictitious method you would create to return a list of strings)
btnList.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//Goes to the list activity
Intent intentList = new Intent(MainActivity.this, ListActivity.class);
intentList.putExtra("WINENAME", new ArrayList<String>()); // Empty list
intentList.putExtra("WINEPRICE", Arrays.asList("Foo", "Bar")); // Explicit list named items
intentList.putExtra("WINEDESCRIPTION", getDescriptions()); // Get list from private method
startActivity(intentList);
}
});
Also check this post my be useful for learning how to read and understand a crash log.
And check the documentation on how to start activities.
Hope that helps!
i have my first activity with two EditText fields with hint's as first name and last name, when ever i go to my second activity and return to my first activity by a widget button the EditText fields in my first activity gets reset.
SIMPLY i want my EditText fields to remain same in my first activity as i re-visit my first activity from my second activity.
MY MainActivity.java
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void onButton1Click(View v)
{
Intent intent = new Intent (this,MainActivity2.class);
startActivity(intent);
}
}
My MainActivity2.java
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
}
}
SOLUTION - i changed my second activity to this. just added reference to my Button and applied an onClickListener with onBackPressed(); code.
setContentView(R.layout.activity_main2);
Button button = (Button)findViewById(R.id.button3); //gave reference of button in second activity
button.setOnClickListener(new View.OnClickListener() { //and applied an onClickListener with code onBackpressed();
public void onClick(View v) {
onBackPressed();
// Code here executes on main thread after user presses button
}
});
}
Really Really thnx to #Narendra Sorathiya for his guidance.
Open secondActivity like below,
Intent i = new Intent(A.this,B.class);
startActivity(i);
finish();
to
Intent i = new Intent(A.this,B.class);
startActivityForResult(i,1);
do not open 1st Activity from 2nd Activity, just need to back press.
try this
declare all variavle at top of activity
public static final String MyPREFERENCES = "MyPrefs" ;
public static final String FNAME = "fname";
public static final String LNAME = "lname";
SharedPreferences sharedpreferences;
write this code when you move to your next activity
sharedpreferences = getSharedPreferences(MyPREFERENCES, Context.MODE_PRIVATE);
// store login data in sharedpreferences
SharedPreferences.Editor editor = sharedpreferences.edit();
editor.putString(FNAME, edittext.getText());
editor.putString(LNAME, edittext2.getText());
editor.commit(); //save data in sharedpreferences
write this code in your oncreate method after you bind your controls
and get data from sharedprefrence like this
String fname= prefs.getString(FNAME, "");
String fname= prefs.getString(LNAME, "");
than set it to your editext like this
editext.setText(fname);
editext2.setText(lname);
let me know in case of any query
I have followed a tutorial for button creation and this is the code I have for the button:
public class MainActivity extends ActionBarActivity {
private final static String EXTRA_MESSAGE = "com.example.jamie.lifewithasd.MESSAGE";
public void Parents(View v) {
Button button=(Button) v;
startActivity(new Intent(getApplicationContext(),ParentPage.class));
EditText editText = (EditText) findViewById(R.id.edit_message);
String message = editText.getText().toString();
intent.putExtra(EXTRA_MESSAGE, message);
startActivity(intent);
I have no idea if I can create all my buttons the same way or not.
If you want to create button pragmatically then check out this link for creating button pragmatically.
http://www.mysamplecode.com/2011/10/android-programmatically-generate.html
If you want to open another activity from current then you need intent.
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
Intent i = new Intent(CurrentActivity.this, ActivityTwo.class);
startActivity(i);
}
});
Check out these links
http://www.vogella.com/tutorials/AndroidIntent/article.html
http://www.mkyong.com/android/android-button-example/