Develop Reference

calling startActivityForResult isn't passing intents back properly

In my code, I have a class for a recipe and then another class for each step. The recipe class holds an arraylist of the steps in that recipe.
I have 3 processes being called one after the other:
MainActivity calls AddEditRecipe using startActivityResult
within AddEditRecipe I have another startActivityResult which calls AddStep
within AddStep I am adding a new instance of step to the list in the recipe.
It successfully adds the object to the list before finish() is called, but when I check the size of the list when I have gone to the 2nd activity it has reverted back to 0, even though I've managed to create buttons with the data I collected from the AddStep functions.
Basically I don't know what to do make it so it everything correctly persists.
Also a heads up, I am still fairly new too java so there's probably lots of other things wrong, any random advice is greatly appreciated.
MainActivity
import android.content.Intent;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ScrollView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
Button newRecipe;
Button editRecipe;
Button deleteRecipe;
LinearLayout recipeLayout;
List<NewRecipe> listOfRecipes;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listOfRecipes = new ArrayList<>();
recipeLayout = (LinearLayout) findViewById(R.id.RecipeListLayout);
newRecipe = (Button) findViewById(R.id.NewRecipeButton);
newRecipe.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent i = new Intent(MainActivity.this, AddRecipePopUp.class);
startActivityForResult(i,998);
}
});
}
protected void onActivityResult(int requestCode, int resultCode, Intent data){
if(requestCode==999 && resultCode == RESULT_OK){
NewRecipe rec = (NewRecipe)data.getParcelableExtra("curr_recipe");
Log.d("Number of Steps",Integer.toString(rec.listOfSteps.size()));
UpdateScreen(rec);
}
if(requestCode== 998 && resultCode == RESULT_OK){
NewRecipe recipe =(NewRecipe)data.getParcelableExtra("curr_recipe");
listOfRecipes.add(recipe);
Intent i = new Intent(MainActivity.this,AddEditRecipe.class);
i.putExtra("curr_recipe", recipe);
startActivityForResult(i,999);
}
}
void UpdateScreen(final NewRecipe recipe){
Button button = new Button(this);
button.setText(recipe.name);
button.setHeight(120);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
NewRecipe recipe1 = recipe;
Button thisBut = (Button)view;
String butName = thisBut.getText().toString().toLowerCase();
for(int j = 0;j<listOfRecipes.size();j++){
String curr = listOfRecipes.get(j).name.toString().toLowerCase();
Log.d("Button ",thisBut.getText().toString());
Log.d("Current List ",listOfRecipes.get(j).name.toString().toLowerCase());
Log.d("Check bool statement", Boolean.toString(butName ==curr));
}
//recipe1 = listOfRecipes.get(0);
Intent i = new Intent(MainActivity.this, AddEditRecipe.class);
i.putExtra("curr_recipe",recipe1);
startActivityForResult(i,997);
}
});
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
recipeLayout.addView(button,lp);
}
}
AddEditRecipe
import android.app.Activity;
import android.app.Dialog;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
public class AddEditRecipe extends Activity {
Button home;
Button add;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.add_edit_recipe);
Intent i = getIntent();
final NewRecipe this_recipe = i.getParcelableExtra("curr_recipe");
Log.d("Number of Steps",Integer.toString(this_recipe.listOfSteps.size()));
LinearLayout recipeLayout = (LinearLayout) findViewById(R.id.RecipeListLayout);
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
for(int j = 0; j<this_recipe.listOfSteps.size();j++){
Button button = new Button(this);
button.setText(this_recipe.listOfSteps.get(j).processName);
button.setHeight(120);
recipeLayout.addView(button,lp);
}
home = (Button) findViewById(R.id.HomeButton);
home.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent i = new Intent(AddEditRecipe.this, MainActivity.class);
i.putExtra("curr_recipe", this_recipe);
setResult(RESULT_OK,i);
Log.d("Number of Steps",Integer.toString(this_recipe.listOfSteps.size()));
finish();
}
});
add = (Button) findViewById(R.id.AddStepButton);
add.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent i = new Intent(AddEditRecipe.this, AddStep.class);
i.putExtra("curr_recipe", this_recipe);
startActivityForResult(i,999);
}
});
}
protected void onActivityResult(int requestCode, int resultCode, Intent data){
if(requestCode==999 && resultCode == RESULT_OK){
NewRecipe curr_rec = (NewRecipe)data.getParcelableExtra("curr_recipe");
Button button = new Button(this);
button.setText(curr_rec.listOfSteps.get(curr_rec.listOfSteps.size()-1).processName + " " + curr_rec.listOfSteps.get(curr_rec.listOfSteps.size()-1).seconds );
button.setHeight(120);
LinearLayout lay = (LinearLayout) findViewById(R.id.RecipeListLayout) ;
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
lay.addView(button,lp);
}
}
}
AddStep
import android.app.Activity;
import android.content.Intent;
import android.graphics.Canvas;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class AddStep extends Activity{
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.add_step);
Intent i = getIntent();
final NewRecipe this_recipe = (NewRecipe) i.getParcelableExtra("curr_recipe");
Button finish = (Button) findViewById(R.id.AddStepButton);
finish.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
EditText name = (EditText) findViewById(R.id.nameEditText);
EditText hours = (EditText) findViewById(R.id.HoursEditText);
EditText minutes = (EditText) findViewById(R.id.MinutesEditText);
EditText seconds = (EditText) findViewById(R.id.SecondsEditText);
this_recipe.AddStep((ConvertToSeconds(Integer.parseInt(hours.getText().toString()),Integer.parseInt(minutes.getText().toString()),Integer.parseInt(seconds.getText().toString()))),name.getText().toString());
Intent j = new Intent(AddStep.this, AddEditRecipe.class);
j.putExtra("curr_recipe", this_recipe);
Log.d("Number of Steps",Integer.toString(this_recipe.listOfSteps.size()));
setResult(RESULT_OK,j);
finish();
}
});
}
int ConvertToSeconds(int h, int m, int s){
int ans = 0;
for(int i = 0; i<h;i++){
ans+=3600;
}
for(int i = 0; i<m;i++){
ans+=60;
}
for(int i = 0; i<s;i++){
ans++;
}
return ans;
}
}

Adding new ListView item and get value of item from another activity

I am trying to make a "News App" with Android Studio. I have on my main activity a ListView and a floating button. On my second activity I got two TextViews, two EditViews and one Button. What I'd like to do is the following:
First I press on the floating Button from my main Activity. Then the second Activity should pop up and there I write on the two EditText's and then press on the button. After that I should go back to the main activity and there, a new Item should be added to the ListView. The new item should be filled with the text from the second activity's EditTexts.
This is my main activity:
package news;
import android.content.Intent;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Get subject value from addpost Activity
final String new_value = getIntent().getStringExtra("newSubject");
String [] new_subject = new String []
{new_value};
FloatingActionButton add_post_button = findViewById(R.id.post_btn);
final ListView post_view = findViewById(R.id.news_feed);
//Create Adapter to add the new subject to listview
if (new_subject != null) {
ArrayAdapter newslist_adapter = new ArrayAdapter(
MainActivity.this,
android.R.layout.simple_expandable_list_item_1, new_subject);
post_view.setAdapter(newslist_adapter);
}
add_post_button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(MainActivity.this, addpost_activity.class);
MainActivity.this.startActivity(intent);
}
});
}
}
This is the second activity(addpost_activity):
package news;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.content.Intent;
import android.widget.EditText;
import android.widget.ListView;
import java.util.ArrayList;
public class addpost_activity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_addpost_activity);
Button post_button = findViewById(R.id.post_btn);
final EditText subject_text = findViewById(R.id.subject_edit);
post_button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if(subject_text.getText() != null) {
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
intent.putExtra("newSubject", subject_text.getText().toString());
startActivity(intent);
}
}
});
}
}
My problem is now that the app crashes every time I start it. I also get this message from my logs:
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.Object.toString()' on a null object reference
Solved:
Thanks to Munir, the problem was solved.
Here are my activities
MainActivity:
package news;
import android.app.Activity;
import android.content.Intent;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
ArrayAdapter newslist_adapter;
ArrayList<String> new_subject = new ArrayList<>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FloatingActionButton add_post_button = findViewById(R.id.post_btn);
//Create Adapter to add the new subject to listview
add_post_button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(MainActivity.this, addpost_activity.class);
startActivityForResult(intent, 1);
}
});
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
final ListView post_view = findViewById(R.id.news_feed);
if (requestCode == 1) {
if(resultCode == Activity.RESULT_OK){
String new_value = data.getStringExtra("newSubject");
new_subject.add(new_value);
newslist_adapter = new ArrayAdapter(
MainActivity.this,
android.R.layout.simple_expandable_list_item_1, new_subject);
post_view.setAdapter(newslist_adapter);
}
}
}
}
This is my second Activity(addpost_activity):
package news;
import android.app.Activity;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.content.Intent;
import android.widget.EditText;
import android.widget.ListView;
import java.util.ArrayList;
public class addpost_activity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_addpost_activity);
Button post_button = findViewById(R.id.post_btn);
final EditText subject_text = findViewById(R.id.subject_edit);
post_button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if(subject_text.getText() != null) {
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
intent.putExtra("newSubject", subject_text.getText().toString());
setResult(Activity.RESULT_OK, intent);
finish();
}
}
});
}
}

For that purpose I suggest using Fragments instead of two Activities. The MainActivity then holds all your data.
See Fragments guide.

From your MainActivity call the addpost_activity using startActivityForResult() method Instead of startActivity();
In your addpost_activity set the data which you want to return back to FirstActivity
post_button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if(subject_text.getText() != null) {
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
intent.putExtra("newSubject", subject_text.getText().toString());
setResult(Activity.RESULT_OK,intent );
finish();
}
}
});
And in the MainActivity Access the result by overriding onActivityResult()
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 1) {
if(resultCode == Activity.RESULT_OK){
String result=data.getStringExtra("newSubject");
//Add this value to your adapter and call notifyDataSetChanged();
}
}
}

use ArrayList insted of String [] if you want to keep old entry in list change your code like below.
Main Activity
declare this variable as global
ArrayAdapter newslist_adapter;
ArrayList<String> new_subject = new ArrayList<>();
set Adapter like
newslist_adapter = new ArrayAdapter(
MainActivity.this,
android.R.layout.simple_expandable_list_item_1, new_subject);
post_view.setAdapter(newslist_adapter);
change startActivity to startActivityForResult
add_post_button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(MainActivity.this, addpost_activity.class);
startActivityForResult(intent,100);
}
});
Override this method in onActivity
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 100) {
String result=data.getStringExtra("newSubject");
new_subject.add(result)
//Add this value to your adapter and call newslist_adapter.notifyDataSetChanged();
}
}
And In your addpost_activity set the data which you want to return back
post_button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if(subject_text.getText() != null) {
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
intent.putExtra("newSubject", subject_text.getText().toString());
setResult(100,intent );
finish();
}
}
});

In MainActivity.java, you should override a function named "onActivityRecsult" this method will be called when you come back from second activity to first activity.

SecondActivity is not receiving the value - Intent related

import android.content.Intent;
import android.content.SharedPreferences;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.Random;
public class MainActivity extends AppCompatActivity {
TextView t1,t2;
Button generate1;
MediaPlayer pickupgold, pickupplatinum;
SharedPreferences mySharedPreferences;
private static Button button2;
#Override
protected void onCreate(Bundle savedInstanceState) {
mySharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
pickupgold = MediaPlayer.create(this, R.raw.pickup_gold);
pickupplatinum = MediaPlayer.create(this, R.raw.pickup_platinum);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
OnClickButtonListener();
final ImageView imageView = (ImageView) findViewById(R.id.imageView);
final ImageView imageView2 = (ImageView) findViewById(R.id.imageView2);
t1 = (TextView) findViewById(R.id.textView3);
t2 = (TextView) findViewById(R.id.textView8);
generate1 = (Button) findViewById(R.id.button);
generate1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
TextView userTextEntry = (TextView) findViewById(R.id.textView3);
String userData = userTextEntry.getText().toString();
int num2 = mySharedPreferences.getInt("INT_KEY1", Integer.parseInt(userData));
int num3 = mySharedPreferences.getInt("INT_KEY2", -1);
Intent intent = new Intent(MainActivity.this, SecondActivity.class);
intent.putExtra("parameter1", num2);
Random rand = new Random();
int num1 = rand.nextInt(100);
if (num1 % 2 == 0) {
pickupgold.start();
num2 += 1;
SharedPreferences.Editor editor = mySharedPreferences.edit();
editor.putInt("INT_KEY1", num2);
editor.apply();
t1.setText(String.format("%d", num2));
imageView.startAnimation(AnimationUtils.loadAnimation(MainActivity.this, android.R.anim.slide_in_left));
Toast.makeText(getApplicationContext(), R.string.foundgold2, Toast.LENGTH_LONG).show();
}else{
Toast.makeText(getApplicationContext(), R.string.notfoundgold, Toast.LENGTH_LONG).show();
} if (num1 == 1){
pickupplatinum.start();
num3 += 1;
SharedPreferences.Editor editor = mySharedPreferences.edit();
editor.putInt("INT_KEY2", num3);
editor.apply();
t2.setText(String.format("%d", num3));
imageView2.startAnimation(AnimationUtils.loadAnimation(MainActivity.this, android.R.anim.slide_in_left));
Toast.makeText(getApplicationContext(), R.string.foundplatinum1, Toast.LENGTH_LONG).show();
}
}
});
}
public void OnClickButtonListener() {
button2 = (Button)findViewById(R.id.button2);
button2.setOnClickListener(
new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent("com.example.tans.goldminer1.SecondActivity");
startActivity(intent);
}
}
);
}
This is MainActivity.java
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.TextView;
public class SecondActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
Intent intent = getIntent();
int goldamountval = intent.getIntExtra("parameter1", 0);
TextView goldamount = (TextView) findViewById(R.id.goldamount);
goldamount.setText("" + goldamountval);
}
and This is SecondActivity.java
I think the int value should be loaded from MainActivity.java but
When I go to SecondActivity, It does not seem to appear, Just showing 0.
What's the reason and how can i solve it? and Sorry, My Code may look like confused. :<

Try this on SecondActivity
Intent intent = new Intent(MainActivity.this, SecondActivity.class);
intent.putExtra("parameter1", num2);
startActivity(intent );

You need to start the SecondActivity after the first two lines :
Intent intent = new Intent(MainActivity.this, SecondActivity.class);
intent.putExtra("parameter1", num2);
startActivity(intent);

Intent intent = new Intent(context, YourActivityClass.class);
intent.putExtra(KEY, );
startActivity(intent);
Seocnd Activity-
Intent intent = getIntent();
if (null != intent) {
String stringData= intent.getStringExtra(KEY);
int numberData = intent.getIntExtra(KEY, defaultValue);
boolean booleanData = intent.getBooleanExtra(KEY, defaultValue);
char charData = intent.getCharExtra(KEY, defaultValue);
}

java.lang.RuntimeException: Performing stop of activity that is not resumed:

I am getting a runtime exception when I am calling NavDrawerActivity from LoginScreen activity.
Error
java.lang.RuntimeException: Performing stop of activity that is not
resumed:
{com.example.owner.loginapp/com.example.owner.loginapp.NavDrawerActivity}
How to fix this error?
Here is my loginScreen code
package com.example.owner.loginapp;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;
import android.content.SharedPreferences;
public class LoginScreen extends AppCompatActivity {
ImageView image;
ImageView user_img;
ImageView pass_img;
Button log_in;
Button reg;
EditText editText_Username;
EditText editText_Pass;
UserSessionManager session;
private SharedPreferences sharedPreferences;
private static final String PREFER_NAME = "Reg";
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
session = new UserSessionManager(getApplicationContext());
image = (ImageView) findViewById(R.id.imageView);
image.setImageResource(R.drawable.smile);
user_img = (ImageView) findViewById(R.id.user_img);
user_img.setImageResource(R.drawable.user_img);
pass_img = (ImageView) findViewById(R.id.pass_img);
pass_img.setImageResource(R.drawable.img_pass);
log_in = (Button) findViewById(R.id.btn_Login);
reg = (Button) findViewById(R.id.btn_Reg);
editText_Username = (EditText) findViewById(R.id.editText_UserName);
editText_Pass = (EditText) findViewById(R.id.editText_Password);
Bitmap icon = BitmapFactory.decodeResource(getResources(),
image.setImageBitmap(icon);
Toast.makeText(getApplicationContext(),
"User Login Status: " + session.isUserLoggedIn(),
Toast.LENGTH_LONG).show();
sharedPreferences = getSharedPreferences(PREFER_NAME, Context.MODE_PRIVATE);
log_in.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String username = editText_Username.getText().toString();
String password = editText_Pass.getText().toString();
if (username.trim().length() > 0 && password.trim().length() > 0) {
String uName = null;
String uPassword = null;
if (sharedPreferences.contains("Name")) {
uName = sharedPreferences.getString("Name", "");
}
if (sharedPreferences.contains("Password")) {
uPassword = sharedPreferences.getString("Password", "");
}
if (username.equals(uName) && password.equals(uPassword)) {
session.createUserLoginSession(uName, uPassword);
Intent i = new Intent(getApplicationContext(), NavDrawerActivity.class);
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(i);
} else {
Toast.makeText(getApplicationContext(),
"Username/Password is incorrect",
Toast.LENGTH_LONG).show();
}
} else {
Toast.makeText(getApplicationContext(),
"Please enter username and password",
Toast.LENGTH_LONG).show();
}
}
});
reg.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
setContentView(R.layout.register);
Intent i = new Intent(getApplicationContext(), Reg.class);
startActivity(i);
}
});
}
}

I copied your code and tried to instantiate a Reg Activity class that I designed and everything worked fine. It is possible that you are doing something wrong in the 1onResumeoronCreate` of Reg class.
Post that class too for more information.

Switching activities/passing data between activities

So using suggestions from the last question I asked, I figured out how to call BarCodeScanner, and return the value to a field. so now, I have a toast that says "successful scan" and then I want to pass the result to a new activity. when I comment out my intent, everything works (minus the passing of data/switching of screen, obviously) but when I run my project as is, it FC's... no errors reported by eclipse in code or XML. Any insights?
package com.mhe.test.scan;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class main extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button myScanButton = (Button) findViewById(R.id.myScanButton);
totalbox = (EditText) findViewById(R.id.tBox);
myScanButton.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent("com.google.zxing.client.android.SCAN");
intent.putExtra("SCAN_MODE", "PRODUCT_MODE");
startActivityForResult(intent, 0);
}
});
}
private EditText totalbox;
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
if (requestCode == 0) {
if (resultCode == RESULT_OK) {
final String contents = intent.getStringExtra("SCAN_RESULT");
if ( totalbox != null )
totalbox.setText(contents);
Context context = getApplicationContext();
CharSequence text = "Successful Scan";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, text, duration);
toast.show();
Intent i = new Intent(main.this, Result.class);
i.putExtra("SNARP", "SCAN_RESULT");
startActivityForResult(i, 0);
} else if (resultCode == RESULT_CANCELED) {
if ( totalbox != null )
totalbox.setText("bummer");
}
}
}
}
And then to handle the data being passed, in the new activity:
package com.mhe.test.scan;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class Result extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.result);
Intent i = getIntent();
Bundle b = i.getExtras();
String foosh = b.getString("SNARP");
EditText box1 = (EditText) findViewById(R.id.tBox1);
box1.setText(foosh);

Try sending a Bundle object when calling the new intent.
Intent i = new Intent(main.this, Result.class);
Bundle b = new Bundle();
b.putString("SNARP", "SCAN_RESULT")
i.putExtras(b);

Try getting string in the child Activity this way.
public class Result extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.result);
Intent i = getIntent();
String foosh = i.getStringExtra("SNARP");