onActivityResult yields null Intent

onActivityResult yields null Intent - android

In this case two activities A and B should interact in that way that A calls B for a result.
But A never gets any data back from B.
This code looks like any tutorial or SO question I have seen.
The debugging session confirmed that setResult is called.
This problem is robbing me of my motivation, would be nice if someone could point out what I am missing.
EDIT: The code doesn't work when executed on my physical target device, but runs find on a nexus 5 device. What could I try to find out why?
MainActivity.java
package iifym.apps.rnoennig.de.myapplication;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
public void onClick(View view) {
Intent in = new Intent(this, SecondActivity.class);
in.putExtra("mau", "bar");
startActivityForResult(in, 1);
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// data is null ;(
Toast.makeText(this, String.valueOf(data), Toast.LENGTH_SHORT).show();
}
}
SecondActivity.java
package iifym.apps.rnoennig.de.myapplication;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;
public class SecondActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.second);
Toast.makeText(this, String.valueOf(getIntent()), Toast.LENGTH_SHORT).show();
}
public void onClick(View view) {
setResult(RESULT_OK, new Intent().putExtra("foo", "bar"));
finish();
}
}
layout/main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"
android:id="#+id/button"
android:layout_gravity="center_horizontal"
android:onClick="onClick"
/>
</LinearLayout>
layout/second.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"
android:id="#+id/button2"
android:layout_gravity="center_horizontal"
android:onClick="onClick"
/>
</LinearLayout>
AndroidManifest.xml
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="iifym.apps.rnoennig.de.myapplication">
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".SecondActivity"></activity>
</application>
</manifest>

Works for me. (Same layouts and Manifest).
Main
public class MainActivity extends AppCompatActivity {
public static final int MAIN_REQUEST = 1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void onClick(View v) {
Intent in = new Intent(MainActivity.this, SecondActivity.class);
in.putExtra("mau", "start 2nd");
startActivityForResult(in, MAIN_REQUEST);
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == MAIN_REQUEST) {
if (resultCode == RESULT_OK) {
Toast.makeText(MainActivity.this, data.getStringExtra("foo"), Toast.LENGTH_SHORT).show();
}
}
}
}
Second
public class SecondActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
Intent sent = getIntent();
if (sent != null) {
Toast.makeText(SecondActivity.this, sent.getStringExtra("mau"), Toast.LENGTH_SHORT).show();
}
}
public void onClick(View v) {
setResult(RESULT_OK, new Intent().putExtra("foo", "finish 2nd"));
finish();
}
}

Related

button settext to next class

I have two classes; the first.class and second.class. On my first.class there is a button and on my second.class there is no button. I need it so when the button from the first.class is clicked there will be a text that will appear on the second.class with an option to save it.
first.class
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
}
});

public class first{
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
second.setText(text);
}
});
}
public class second{
private static String textFromFirst;
public static void setText(String text){
second.textFromFirst = text;
}
}

activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="57dp"
android:layout_marginTop="23dp"
android:text="Click" />
</RelativeLayout>
MainActivity.java
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity {
Button btn;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn = (Button) findViewById(R.id.button1);
btn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent in = new Intent(getBaseContext(), Second.class);
startActivity(in);
}
});
}
}
second.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>
Second.java
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class Second extends Activity {
TextView tv;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.second);
tv = (TextView)findViewById(R.id.textView1);
}
#Override
public void onResume()
{
super.onResume();
tv.setText("Hello");
}
}
manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.f"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.f.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".Second" />
</application>
</manifest>

do this:
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent p = new Intent(first.this,
second.class);
startActivity(p);
}
});
and then in second class load a xml file containing textview
package ......;
import java.io.File;
import java.io.IOException;
import dolphin.devlopers.com.R;
import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
public class gmail1 extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.second); //the file which contains textview and ui
TextView tv = (TextView)findViewById(R.id.textView1);
}
Manifest file:
<Activity
android:name="first">
</Activity>
<Activity
android:name="second">
</Activity>
second.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="hi"
/>
</RelativeLayout >

Your question is a bit unclear.
When you say first.class and second.class, do you mean they both extends Activity?
Meaning, they are two different "Screens" in your app, and clicking the button on the first activity would launch the second and change its text? if so, You can use intents to pass info between activities. Something like this:
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(first.this, second.class);
// NOW COMES THE IMPORTANT PART, Put the text you want to be passed
intent.putExtra("text_identifier", "The text to show");
startActivity(intent);
}
});
and in Second.java:
private TextView tv;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.second);
tv = (TextView) findViewById(R.id.textView);
// Retreive the text you sent eralier
String theText = getIntent().getStringExtra("text_identifier");
tv.setText(theText);
// Do any extra onCreate things
}
If it's not what you're after, let me know and I'll see what I can think off, but please try to explain a bit better
Good luck!

Saving state of activity on orientation change using different Layouts?

I am using two different Layouts for same Activity, On orientation change the activity state is not maintained. Please suggest how to do that?

You can easily store your "activity state" using onSavedInstanceState. For example:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if(saveInstanceState != null) {
if(savedInstanceState.getBoolean("running") == true) {
// previously is running
} else {
// previously not running
}
}
}
#Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
if(condition) {
outState.putBoolean("running", true);
}
}

You seem to do some work in an AsyncTask and then you're changing the orientation.
Move the task you're doing from AsyncTask in an IntentService. Once the job is executed, send a broadcast with the result. In your activity, register a BroadcastReceiver in onCreate and de-register it in onDestroy.
That receiver will handle the result of your operation. You could also send from IntentService some intermediary data/progress update that can be received and processed by the same Receiver.
EDIT: to show some code.
The first search result on Google for IntentService tutorial. But I would strongly recommend reading more about Services. Also Vogella has a nice article about this.
About BroadcastReceivers.
If you want something to get you started here's a sample project I built in 15 mins:
The activity:
package com.adip.droid.sampleandroid;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.content.LocalBroadcastManager;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.TextView;
public class FrontActivity extends FragmentActivity {
private TextView labelData;
private BroadcastReceiver receiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (WorkerService.WORK_PROGRESS_ACTION.equals(action)) {
publishProgress(intent.getStringExtra(WorkerService.WORK_KEY_PROGRESS));
} else if (WorkerService.WORK_END_ACTION.equals(action)) {
workInProgress = false;
publishResult(intent.getStringExtra(WorkerService.WORK_KEY_RESULT));
}
}
};
protected void publishProgress(String data) {
showMessage(data);
}
protected void publishResult(String data) {
showMessage(data);
}
private void showMessage(String data) {
labelData.setText(data);
}
/**
* Maybe you need this in order to not start the service once you have an ongoing job ...
* */
private boolean workInProgress;
#Override
protected void onCreate(Bundle instanceState) {
super.onCreate(instanceState);
setContentView(R.layout.front_layout);
if (instanceState != null) {
workInProgress = instanceState.getBoolean("WORK_IN_PROGRESS", false);
}
labelData = (TextView) findViewById(R.id.labelData);
findViewById(R.id.btnWorker).setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
doTheJob();
}
});
IntentFilter filter = new IntentFilter(WorkerService.WORK_END_ACTION);
filter.addAction(WorkerService.WORK_PROGRESS_ACTION);
LocalBroadcastManager.getInstance(this).registerReceiver(receiver, filter);
}
protected void doTheJob() {
if (workInProgress) {
return;
}
Intent serviceIntent = new Intent(this, WorkerService.class);
serviceIntent.setAction(WorkerService.WORK_START_ACTION);
startService(serviceIntent);
}
#Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putBoolean("WORK_IN_PROGRESS", workInProgress);
}
#Override
protected void onDestroy() {
super.onDestroy();
LocalBroadcastManager.getInstance(this).unregisterReceiver(receiver);
}
}
its layout:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<Button
android:id="#+id/btnWorker"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="Start the work" />
<TextView
android:id="#+id/labelData"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/btnWorker"
android:layout_centerHorizontal="true"
android:layout_marginBottom="35dp"
android:freezesText="true"
android:text="No data yet"
android:textAppearance="?android:attr/textAppearanceMedium" />
</RelativeLayout>
and the IntentService:
package com.adip.droid.sampleandroid;
import android.app.IntentService;
import android.content.Intent;
import android.support.v4.content.LocalBroadcastManager;
public class WorkerService extends IntentService {
public static final String WORK_START_ACTION = "WORK_START_ACTION";
public static final String WORK_END_ACTION = "WORK_END_ACTION";
public static final String WORK_KEY_RESULT = "WORK_KEY_RESULT";
public static final String WORK_PROGRESS_ACTION = "WORK_PROGRESS_ACTION";
public static final String WORK_KEY_PROGRESS = "WORK_KEY_PROGRESS";
public WorkerService() {
super("WorkerService");
}
#Override
protected void onHandleIntent(Intent intent) {
if (WORK_START_ACTION.equals(intent.getAction())) {
startProgress();
}
}
private void startProgress() {
publishProgress("Starting the job");
synchronized (this) {
try {
wait(2500);
} catch (InterruptedException ignored) {
}
}
publishProgress("Progress Point A");
synchronized (this) {
try {
wait(2500);
} catch (InterruptedException ignored) {
}
}
publishJobDone();
}
public void publishProgress(String data) {
Intent progressIntent = new Intent(WORK_PROGRESS_ACTION);
progressIntent.putExtra(WORK_KEY_PROGRESS, data);
LocalBroadcastManager.getInstance(this).sendBroadcast(progressIntent);
}
public void publishJobDone() {
Intent progressIntent = new Intent(WORK_END_ACTION);
progressIntent.putExtra(WORK_KEY_RESULT, "Job done!");
LocalBroadcastManager.getInstance(this).sendBroadcast(progressIntent);
}
}
Also don't forget to update your manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.adip.droid.sampleandroid"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".FrontActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service
android:name=".WorkerService"
android:exported="false" >
</service>
</application>
</manifest>

Activity crashes after button click

I currently have this in and android activity but when the button is clicked the application crashes. I cant find what;s wrong.
public class SearchActivity extends Activity implements OnClickListener{
private ListView recipes;
Intent intent;
Button button;
EditText input;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.searchlist);
button = (Button)findViewById(R.id.submit);
input = (EditText)findViewById(R.id.recipeName);
//recipes = (ListView)findViewById(R.id.recipes);
//recipes.setAdapter(new ArrayAdapter<String> (this, R.layout.main, getResources().getStringArray(R.array.BaconSandwich)));
button.setOnClickListener(this);
}
public void onClick(View clicked) {
if(clicked.getId() == R.id.submit) {
//recipes = (ListView)findViewById(R.array.recipes);
String value = input.getText().toString();
Toast.makeText(this, value, Toast.LENGTH_SHORT).show();
Intent i = new Intent(this, RecipeMethodActivity.class);
SearchActivity.this.startActivity(i);
}
}
}
The activity is set in the android manifest and the next activity is blank
The log cat message I get is:
Error in RecipeMethodActivity onCreate().
My RecipeMethodActivity is:
package com.finalyearproject.cookmefood;
import android.app.ListActivity;
import android.os.Bundle;
public class RecipeMethodActivity extends ListActivity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}

i checked your code..
see below
public class DemoActivity extends Activity implements OnClickListener{
private Button button;
private EditText input;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
button = (Button)findViewById(R.id.submit);
input = (EditText)findViewById(R.id.recipeName);
button.setOnClickListener(this);
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(v.getId() == R.id.submit) {
//recipes = (ListView)findViewById(R.array.recipes);
String value = input.getText().toString();
Toast.makeText(this, value, Toast.LENGTH_SHORT).show();
Intent i = new Intent(this, RecipeMethodActivity.class);
DemoActivity.this.startActivity(i);
}
}
}
main.xml
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/hello" />
<EditText
android:id="#+id/recipeName"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<requestFocus />
</EditText>
<Button
android:id="#+id/submit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
RecipeMethodActivity
package com.Demo;
import android.app.ListActivity;
import android.os.Bundle;
public class RecipeMethodActivity extends ListActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.new_layout);
}
}
new_layout.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/linearLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<ListView
android:id="#+id/#android:list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1" >
</ListView>
</LinearLayout>
manifest file:
<uses-sdk android:minSdkVersion="3" />
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name" >
<activity
android:label="#string/app_name"
android:name=".DemoActivity" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".RecipeMethodActivity"></activity>
</application>

Android app hangs when referencing the back button on Secondary screen

I have a small app that when button presses navigates when moving from main screen to next screen this works fine, but when I added a button on the next page (to go back) it breaks.
Fun.java
package com.forcetechnology.OptusApp;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class Fun extends Activity {
OnClickListener backListener;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fun);
Button backButtonf = (Button)findViewById(com.forcetechnology.OptusApp.R.id.backtoMainf);
backListener = new OnClickListener()
{
public void onClick(View v)
{
Intent i = new Intent();
i.setClassName("com.forcetechnology.OptusApp", "com.forcetechnology.OptusApp.OptusAppMain");
startActivity(i);
}
};
backButtonf.setOnClickListener(backListener);
}
}
Fun.Xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ImageButton
android:id="#+id/backtoMainf"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/val5" />
</LinearLayout>
Main.xml
<ImageButton
android:id="#+id/funbutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:background="#drawable/val5"
android:src="#drawable/val5" />
<ImageButton
android:id="#+id/executionbutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/funbutton"
android:layout_alignParentRight="true"
android:background="#drawable/val2"
android:src="#drawable/val2" />
<ImageButton
android:id="#+id/performancebutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/executionbutton"
android:layout_toLeftOf="#+id/funbutton"
android:background="#drawable/val3"
android:src="#drawable/val4" />
<ImageButton
android:id="#+id/innovationbutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/executionbutton"
android:layout_alignParentLeft="true"
android:background="#drawable/val3"
android:src="#drawable/val3" />
<ImageButton
android:id="#+id/peoplebutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/innovationbutton"
android:layout_toLeftOf="#+id/executionbutton"
android:background="#drawable/val1"
android:src="#drawable/val1" />
</RelativeLayout>
OPtusAppMain.java
package com.forcetechnology.OptusApp;
import android.R;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;
public class OptusAppMain extends Activity
{
OnClickListener funListener,executionListener,innovationListener,peopleListener,performanceListener;;
TextView testView;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(com.forcetechnology.OptusApp.R.layout.main);
ImageButton funButton = (ImageButton)findViewById(com.forcetechnology.OptusApp.R.id.funbutton);
ImageButton executionButton = (ImageButton)findViewById(com.forcetechnology.OptusApp.R.id.executionbutton);
ImageButton innovationButton = (ImageButton)findViewById(com.forcetechnology.OptusApp.R.id.innovationbutton);
ImageButton peopleButton = (ImageButton)findViewById(com.forcetechnology.OptusApp.R.id.peoplebutton);
ImageButton performanceButton = (ImageButton)findViewById(com.forcetechnology.OptusApp.R.id.performancebutton);
funListener = new OnClickListener()
{
public void onClick(View v)
{
Intent i = new Intent();
i.setClassName("com.forcetechnology.OptusApp", "com.forcetechnology.OptusApp.Fun");
startActivity(i);
}
};
executionListener = new OnClickListener()
{
public void onClick(View v)
{
Intent i = new Intent();
i.setClassName("com.forcetechnology.OptusApp", "com.forcetechnology.OptusApp.Execution");
startActivity(i);
}
};
innovationListener = new OnClickListener()
{
public void onClick(View v)
{
Intent i = new Intent();
i.setClassName("com.forcetechnology.OptusApp", "com.forcetechnology.OptusApp.Innovation");
startActivity(i);
}
};
peopleListener = new OnClickListener()
{
public void onClick(View v)
{
Intent i = new Intent();
i.setClassName("com.forcetechnology.OptusApp", "com.forcetechnology.OptusApp.People");
startActivity(i);
}
};
performanceListener = new OnClickListener()
{
public void onClick(View v)
{
Intent i = new Intent();
i.setClassName("com.forcetechnology.OptusApp", "com.forcetechnology.OptusApp.Performance");
startActivity(i);
}
};
funButton.setOnClickListener(funListener);
executionButton.setOnClickListener(executionListener);
innovationButton.setOnClickListener(innovationListener);
peopleButton.setOnClickListener(peopleListener);
performanceButton.setOnClickListener(performanceListener);
}
}
Edit: I have traced the error to this line Button backButtonf = (Button)findViewById(com.forcetechnology.OptusApp.R.id.backtoMainf); in fun.java.

In the onClick() of backListener, just call finish() to go back to the previous activity.

Lets take an example: You have two activities "A" & "B", You start your "B" activity from "A" that means your "A" activity is in stack so there is no need to start it again, just finish your "B" activity with "finish()" method.
public class A extends Activity{
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
public void onAbuttonClick()
{
startActivity(new Intent(A.this,B.class));
}
}
}
public class B extends Activity
{
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.second);
}
public onBbuttonclick(View v)
{
finish();
}
}
}

Passing values with intents

I have searched and searched and I just can't get this code to work.I have a main.xml layout and a setting.xml.I have some values I would like the Settings.class to change in my main apps class.Three string to be exact.
I have tried this simple test code in my main app class
settings.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View v) {
Intent intent = new Intent(v.getContext(), Settings.class);
startActivityForResult(intent, 0);
}
});
//Then a function
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent){
super.onActivityResult(requestCode, resultCode, intent);
Bundle extras = intent.getExtras();
String value = extras.getString("myKey");
if(value!=null){
Log.d("hmmm",value);
}
}
}
In my settings.class I have the following
returnHome.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View v) {
Intent intent = new Intent();
intent.putExtra("myKey", "YEAH");
setResult(RESULT_OK, intent);
finish();
}
});
Back in main app class it is not getting logged.
Like I said I have three string in the main class that I want settings class to change and send back.
Any help is greatly appreciated

I have had success with the technique used in the Notepad tutorial where the information is placed in a Bundle and then added to the intent. See Step 10:
Bundle bundle = new Bundle();
bundle.putString(NotesDbAdapter.KEY_TITLE, mTitleText.getText().toString());
bundle.putString(NotesDbAdapter.KEY_BODY, mBodyText.getText().toString());
if (mRowId != null) {
bundle.putLong(NotesDbAdapter.KEY_ROWID, mRowId);
}
Intent mIntent = new Intent();
mIntent.putExtras(bundle);
setResult(RESULT_OK, mIntent);
finish();

Your code works fine for me, here's the whole lot
Main.java
package com.test;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class Main extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button settings = (Button) findViewById(R.id.settings);
settings.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(v.getContext(), Settings.class);
startActivityForResult(intent, 0);
}
});
}
#Override
protected void onActivityResult(int requestCode, int resultCode,
Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
Bundle extras = intent.getExtras();
String value = extras.getString("myKey");
if (value != null) {
Log.d("hmmm", value);
}
}
}
Settings.java
package com.test;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class Settings extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.settings);
Button returnHome = (Button) findViewById(R.id.returnHome);
returnHome.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent();
intent.putExtra("myKey", "YEAH");
setResult(RESULT_OK, intent);
finish();
}
});
}
}
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<Button
android:text="Settings"
android:id="#+id/settings"
android:layout_width="wrap_content"
android:layout_height="wrap_content"></Button>
</LinearLayout>
settings.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button
android:text="Return home"
android:id="#+id/returnHome"
android:layout_width="wrap_content"
android:layout_height="wrap_content"></Button>
</LinearLayout>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest
xmlns:android="http://schemas.android.com/apk/res/android"
package="com.test"
android:versionCode="1"
android:versionName="1.0">
<application
android:icon="#drawable/icon"
android:label="#string/app_name">
<activity
android:name=".Main"
android:label="#string/app_name">
<intent-filter>
<action
android:name="android.intent.action.MAIN" />
<category
android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="Settings"
android:label="Settings" />
</application>
</manifest>
And the logcat came out:
11-17 12:21:46.717: DEBUG/hmmm(258): YEAH

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

onActivityResult yields null Intent - android

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Passing values with intents

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