Develop Reference

Testing a transition between two activities and going back to the first activity

I am developing an app that requires the user to press a button and it goes to another activity. The problem is that I cannot continue from there. I want to be able to simulate a button press and go back to the previous activity it was on. Here is my code.
package com.example.guy.smsclassproject;
import android.os.Looper;
import android.test.ActivityInstrumentationTestCase2;
import android.test.UiThreadTest;
import android.test.suitebuilder.annotation.SmallTest;
import android.widget.Button;
import android.widget.EditText;
import java.util.ArrayList;
/**
* Created by ksl130230 on 11/5/2015.
*/
public class DraftsActivityTest extends ActivityInstrumentationTestCase2<DraftsActivity> {
private DraftsActivity tester;
private EditText searchText;
private Button searchButton;
private DraftsDatabase draftsDatabase;
private MessageObject messageObject1;
private MessageObject messageObject2;
private MessageObject messageObject3;
Button[] draftButtons;
ArrayList<MessageObject> messagesToBeDisplayed;
public DraftsActivityTest() {
super(DraftsActivity.class);
}
#Override
#UiThreadTest
public void setUp() throws Exception {
super.setUp();
if (Looper.myLooper() == null)
{
Looper.prepare();
}
draftsDatabase = new DraftsDatabase();
draftsDatabase.clearData();
messageObject1 = new MessageObject("hi", "5554",null, true);
messageObject2 = new MessageObject("hi hi", "5555554",null, true);
messageObject3 = new MessageObject("sup", "5435555554",null, true);
draftsDatabase.addMessage(messageObject1);
draftsDatabase.addMessage(messageObject2);
draftsDatabase.addMessage(messageObject3);
tester = getActivity();
messagesToBeDisplayed = tester.messagesToBeDisplayed;
searchText = (EditText) tester.findViewById(R.id.searchText);
searchButton = (Button) tester.findViewById(R.id.searchButton);
}
#SmallTest
#UiThreadTest
public void testSearch() {
searchText.setText("hij");
searchButton.performClick();
messagesToBeDisplayed = tester.messagesToBeDisplayed;
assertEquals("Messages with the word hi", 0, messagesToBeDisplayed.size());
searchText.setText("sup");
searchButton.performClick();
messagesToBeDisplayed = tester.messagesToBeDisplayed;
assertEquals("Messages with the word sup", 1, messagesToBeDisplayed.size());
searchText.setText("yo");
searchButton.performClick();
messagesToBeDisplayed = tester.messagesToBeDisplayed;
assertEquals("Messages with the word yo", 0, messagesToBeDisplayed.size());
searchText.setText("i");
searchButton.performClick();
messagesToBeDisplayed = tester.messagesToBeDisplayed;
assertEquals("Messages with the word i", 2, messagesToBeDisplayed.size());
}
#SmallTest
#UiThreadTest
public void testRedisplay()
{
assertNotNull(tester.draftButtons[0]);
tester.draftButtons[0].performClick();
messagesToBeDisplayed = tester.messagesToBeDisplayed;
assertEquals("Size of the list after deletion is 2", 2, messagesToBeDisplayed.size()); //presses the first button, which deletes it from the drafts
getActivity();
String buttonText0 = tester.draftButtons[0].getText().toString();
if(buttonText0.equals("5555554: hi hi")) assertSame("Text redisplayed on the first button", buttonText0, messageObject2.toString()); //gets the text of the current button, since the messageobject1 was in draftsButtons0 before, not it should have messageobject2
assertNotNull(tester.draftButtons[1]);
String buttonText1 = tester.draftButtons[1].getText().toString();
if(buttonText1.equals("5435555554: sup"))
assertSame("Text redisplayed on the second button", buttonText1, messageObject3.toString());
}
#SmallTest
#UiThreadTest
public void testMessageButtons()
{
assertNotNull(tester.draftButtons[0]);
tester.draftButtons[0].performClick();
//THE PROBLEM IS LOCATED HERE.
//As soon as I press the button, the app goes to another activity.
//I want it to go back from the activity.
assertNotNull(tester.draftButtons[1]);
tester.draftButtons[1].performClick();
messagesToBeDisplayed = tester.messagesToBeDisplayed;
assertEquals("The draftsDatabase now only contains 1 message", 1, messagesToBeDisplayed.size());
assertNotNull(tester.draftButtons[0]);
tester.draftButtons[0].performClick();
assertNull(draftsDatabase); //after you press all the buttons, the draftsDatabase should be empty because all the messages have been deleted
}
}

This is my code of application which I recently made. If user press a button it goes to another activity from this you will be to simulate a button press and go back to the previous activity and I also have made some modification that you can pass data from text view to second activity
MainActivity
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void onClick(View view) {
Intent i = new Intent(this, Main2Activity.class);
final EditText inputText = (EditText) findViewById(R.id.inputText);
String mesg = inputText.getText().toString();
i.putExtra("mm",mesg );
startActivity(i);
}
}
Main2Activity
import android.annotation.TargetApi;
import android.content.Intent;
import android.os.Build;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.transition.Transition;
import android.transition.TransitionManager;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.RelativeLayout;
import android.widget.TextView;
public class Main2Activity extends AppCompatActivity {
ViewGroup RLayout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
Bundle data = getIntent().getExtras();
if(data == null){
return;
}
String mm = data.getString("mm");
final TextView textVieww = (TextView) findViewById(R.id.textVieww);
textVieww.setText(mm);
RLayout = (ViewGroup) findViewById(R.id.RLayout);
RLayout.setOnTouchListener(
new RelativeLayout.OnTouchListener(){
#Override
public boolean onTouch(View v, MotionEvent event) {
moveButton();
return true;
}
});
}
public void onClickk(View view) {
Intent i = new Intent(this, MainActivity.class);
startActivity(i);
}
}
Manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.user.razaali.third" >
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".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=".Main2Activity"
android:label="#string/title_activity_main2" >
</activity>
</application>
</manifest>
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:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin" tools:context=".MainActivity"
android:background="#53ff00">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="First Screen"
android:id="#+id/textView"
android:layout_above="#+id/inputText"
android:layout_centerHorizontal="true"
android:layout_marginBottom="33dp" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Change"
android:id="#+id/button"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:onClick="onClick" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/inputText"
android:width="250dp"
android:layout_above="#+id/button"
android:layout_centerHorizontal="true"
android:layout_marginBottom="32dp" />
</RelativeLayout>
activity_main2.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:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
tools:context="com.example.razaali.third.Main2Activity"
android:background="#fff306"
android:id="#+id/RLayout">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Secound Screen"
android:id="#+id/textVieww"
android:layout_above="#+id/button2"
android:layout_centerHorizontal="true"
android:layout_marginBottom="51dp" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Change"
android:id="#+id/button2"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:onClick="onClickk" />
</RelativeLayout>

New activity in Android

I found myself in trouble with creating new activity, I get the unfortunately your app has stopped error message and as a good humanbeing I thought I'd share my misfortune with you:
I can't get my button to open new activity:
MainActivity.java:
package com.example.vogella.dev;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.Toast;
public class MainActivity extends Activity {
private EditText text;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
text = (EditText) findViewById(R.id.editText1);
}
public void onClick(View view) {
switch (view.getId()) {
case R.id.button1:
RadioButton celsiusButton =(RadioButton)findViewById(R.id.radio0);
RadioButtonfahrenheitButton=(RadioButton)findViewById(R.id.radio1);
if (text.getText().length() == 0) {
Toast.makeText(this,getResources().getString(R.string.toast_a),
Toast.LENGTH_LONG).show();
return;
}
float inputValue = Float.parseFloat(text.getText().toString());
if (celsiusButton.isChecked()) {
text.setText(Strgin.valuof(ConvertFahrenheitToCelsius(inputValue)));
fahrenheitButton.setChecked(false);
celsiusButton.setChecked(true);
} else {
text.setText(Strgin.valuof(ConvertCelsiusToFahrenheit(inputValue)));
fahrenheitButton.setChecked(false);
celsiusButton.setChecked(true);
}
break;
}
}
private float convertFahrenheitToCelsius(float fahrenheit) {
return ((fahrenheit - 32) * 5 / 9);
}
private float ConvertCelsiusToFahrenheit(float celsius) {
return ((celsius * 9) / 5) +32;
}
public void scrollview(View v) {
Intent intent =newIntent(this,ScrollviewActivity.class);
startActivity(intent);
}
}
My activity_main.xml
<RelativeLayoutxmlns: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:background="#color/myColor" >
<EditText
android:id="#+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:ems="10"
android:hint="#string/hint"
android:inputType="numberDecimal|numberSigned" >
<requestFocus />
</EditText>
<RadioGroup
android:id="#+id/radioGroup1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="#+id/editText1">
<RadioButton
android:id="#+id/radio0"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="true"
android:text="#string/celsius" />
<RadioButton
android:id="#+id/radio1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/fahrenheit" />
</RadioGroup>
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="#+id/radioGroup1"
android:onClick="onClick"
android:text="#string/calc" />
<Button
android:id="#+id/test_button"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginTop="44dp"
android:layout_toRightOf="#+id/button1"
android:text="#string/test_button"
android:onClick="scrollview"/>
</RelativeLayout>
The AndroidManifest in portion
<activity
android:name="com.example.vogella.dev.Scrollview"
android:label="#string/title_activity_scrollview"
android:parentActivityName=com.example.vogella.dev.MainActivity">
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.vogella.dev.MainActivity" />
</activity>
</application>
And the activity I'm trying to open
public class ScrollviewActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_scrollview);
TextView view = (TextView) findViewById(R.id.TextView02);
String s="";
for (int i=0; i < 500; i++) {
s += "vogella.com" ;
}
view.setText(s);
}
}

Intent intent =newIntent(this,ScrollviewActivity.class);
You forgot the space between new and Intent. However, you may have other problems as well. It would help to tell us the error thrown.

What is the error you are getting in the logcat. May be you have not mentioned your ScrollViewActivity in your Manifest file.Please check

Your manifest must contain the MainActivity:
<activity android:name="com.example.vogella.dev.MainActivity" />

1)use this in onCreate()
Button button = (Button) findViewById(R.id.button1);
you did initialize your EditText then why didnt you do it for your Button named 'button1'
2) even mention your ScrollViewActivity in android manifest
3) Intent i = new Intent(getApplicationContext,ScrollViewActivity.class);
startActivity(i);

Have you declare new Activity in Manifest? If not, add it like this:
<activity android:name="com.example.vogella.dev.ScrollviewActivity" />

How even you compile does IDE not implemented an error
Intent intent =newIntent(this,ScrollviewActivity.class); // Error is here
startActivity(intent);
It should be like this
Intent intent =new Intent(this,ScrollviewActivity.class);
startActivity(intent);
And also never forget to adding your every new activity to Manifest
<activity
android:name="com.activities.ActivitySettings"
android:icon="#drawable/icon_small"
android:label="#string/title_activity_activity_settings"
android:logo="#drawable/icon_small"
android:theme="#style/MyTheme" >
</activity>
Specifically for your question
You have two activity MainActivity and ScrollViewActivity
on manifest you mention this
<activity
android:name="com.example.vogella.dev.Scrollview"
android:label="#string/title_activity_scrollview"
Scrollview is not any of your activity but ScrollViewActivity is

Public void launchActivity(View view){
Intent intent = new Intent(this, youractivityname
Class);
startActivity(intent);

Android — Add new tab when button click like Google Chrome new button?

In general, everything is working on Google Chrome. When the new tab button is clicked, a new tab is generated. In the same way, I want to add a new tab in the Android browser. How to do this — does anyone have any idea?
First, is it possible in Android?
If possible, how to do this?
When I click on the + button, a new tab should be generated. How to do this?

Ok Here is the code but it's an example only you may need to modify the code as per your requirement. I am giving you all the files code here hope you getting answer.
Your Manifest.xml file
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.android.dynamictab"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
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=".BlankActivity"/>
</application>
</manifest>
here is your activity_main.xml file for Tab activity
<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#android:id/tabhost"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:padding="5dp" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
>
<HorizontalScrollView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:fillViewport="true"
android:scrollbars="none"
android:layout_weight="1">
<TabWidget
android:id="#android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="0dip"
android:layout_marginRight="0dip" />
</HorizontalScrollView>
<Button android:id="#+id/add_tab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.1"
android:text="Add"/>
</LinearLayout>
<FrameLayout
android:id="#android:id/tabcontent"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="2dp" />
</LinearLayout>
</TabHost>
Put your TabWidget into the HorizontalScrollView so when more tabs are add it can scrolling and the Add but is out side of HorizontalScrollView. Every time you click on tab it will add new tab in TabWidget.
Here the code for tab_event.xml This layout will inflate and add into tab. You can change the style and its contain a single Button so you can add drawable image with text also.
<?xml version="1.0" encoding="utf-8"?>
<Button xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/button_event"
android:clickable="true"
android:focusable="true"
android:text="Default Tab"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
Here is your MainActivity.java file
import android.app.TabActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TabHost;
import android.widget.TabHost.TabSpec;
public class MainActivity extends TabActivity {
private static int tabIndex = 0;
private TabHost tabHost;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tabHost = getTabHost();
addTab();
((Button)findViewById(R.id.add_tab)).setOnClickListener(new OnClickListener() {
public void onClick(View v) {
tabIndex++;
addTab();
}
});
}
private void addTab(){
LayoutInflater layoutInflate = LayoutInflater.from(MainActivity.this);
Button tabBtn = (Button)layoutInflate.inflate(R.layout.tab_event, null);
tabBtn.setText("Tab "+tabIndex);
Intent tabIntent = new Intent(MainActivity.this, BlankActivity.class);
setupTab(tabBtn, tabIntent,"Tab "+tabIndex);
}
protected void setupTab(View tabBtn, Intent setClass,String tag) {
TabSpec setContent = tabHost.newTabSpec(tag).setIndicator(tabBtn).setContent(setClass);
tabHost.addTab(setContent);
}
}
And here is the BlankActivity.java file
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class BlankActivity extends Activity{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
TextView tv = new TextView(BlankActivity.this);
tv.setText("Blank activity");
setContentView(tv);
}
}

For button click create a new tabspec.
TabSpeec spec = th.newTabSpec("tag");
spec.setContent(new TabHost.TabContentFactory(){
//What ever thing you want to display inside the tab
TextView text = new TextView(CONTEXT);
text.setText("New tab");
return(text);
}
});
spec.setIndicator("New");
th.addTab(spec);
Use the following youtube tutorial as reference. Its simple.
http://www.youtube.com/watch?v=NcKSFlYEqYY

Create an Activity as below:
public class WebViewActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
WebView wv=new WebView(this);
setContentView(wv);
}
}
Now use #Partik's method to add a new tab, on each + button click:
private void addTab(){
Button tabBtn = new Button(MainActivity.this);
tabBtn.setText("Tab "+tabIndex);
Intent tabIntent = new Intent(MainActivity.this, WebViewActivity.class);
setupTab(tabBtn, tabIntent,"Tab "+tabIndex);
}

How to open layout on button click (android)

How can I open another layout xml file when I click on a button in main.xml file?
so if I have main.xml which has a button sying click here and I click it, it opens up second.xml file (layout).

First Create your two 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="fill_parent"
android:layout_height="fill_parent"
android:background="#ffffff" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="#000000"
android:text="This is Activity 1" />
<Button android:text="Next"
android:id="#+id/Button01"
android:layout_width="250px"
android:textSize="18px"
android:layout_height="55px">
</Button>
</LinearLayout>
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="fill_parent"
android:layout_height="fill_parent"
android:background="#ffffff" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="#000000"
android:text="This is Activity 2" />
<Button android:text="Previous"
android:id="#+id/Button02"
android:layout_width="250px"
android:textSize="18px"
android:layout_height="55px">
</Button>
</LinearLayout>
Second Add your Activity to the manifest file
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.rr"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="#drawable/icon" android:label="#string/app_name">
<activity android:name=".Activity1"
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=".Activity2"></activity>
</application>
<uses-sdk android:minSdkVersion="3" />
</manifest>
Activity1.java
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class Activity1 extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button next = (Button) findViewById(R.id.Button01);
next.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent myIntent = new Intent(view.getContext(), Activity2.class);
startActivityForResult(myIntent, 0);
}
});
}
}
To switch to Activity2 you have to:
Gets a reference to the button with ID Button01 on the layout using
(Button) findViewById(R.id.Button01).
Create an OnClick listener for the button.
And the most important part, creates an “Intent” to start another
Activity. The intent needs two parameters: a context and the name of
the Activity that we want to start (Activity2.class)
Activity2.java
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class Activity2 extends Activity {
/** Called when the activity is first created. */
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.second);
Button next = (Button) findViewById(R.id.Button02);
next.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent intent = new Intent();
setResult(RESULT_OK, intent);
finish();
}
});
}

-Inflate the button from the xml
-add an onClickListener on it
-set a new layout in the onClick event
Button btn = (Button) findViewById(R.id.myButton);
btn.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View v)
{
MyActivity.setContentView(R.layout.newlayout);
}
});
Something like this should work...

A Kotlin way:
-Add the onClick event directly in the designer.
Open the activity (Activity1.xml for example) file in the designer mode
Select the button that will trigger the transition
Add the function name on the onClick box of the right panel with all the button properties
-Open the Activity .kt file
Add the function with the name that you just defined in the designer
fun openActivity2(view: View) {
intent = Intent(view.context,Activity2::class.java)
startActivity(intent)
}
Now you have the function linked to the onClick event of your button

Does anyone know how to get the value of edittext from one activity to a textvew in another using a button?

GET EDITTEXT INPUT TO TEXTVIEW IN ANOTHER CLASS USING A BUTTON
I am fairly new to android and I am trying to use an edittext to get user input on one screen (Activity), actually not just one edittext a few like a couple edit texts and maybe a spinner, kind of like a create a new user screen. But I know how to use a button to getText() and setText() from the edittext to the textview if they are in the same activity but can not find anywhere how to accomplish this. Here is something like what the first class's bare bones would be:
public class UserInput extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
EditText edit = (EditText) findViewById(R.id.editText1);
Button button = (Button) findViewById(R.id.button1);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
}
});
}
}
Now I know the magic will be in the onClick(View v){} method, but what magic exactly do I use to 1-open a new Activity that houses the textview and 2- open the Activity?
Here is the second Activity for visual reference:
public class GetText extends Activity{
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main2);
TextView view = (TextView) findViewById(R.id.textView1);
}
}
Again please if anyone can even chop up the code I will use just trying to get it to work right now. Hopefully everyone can rally and give their input as to help others out that may be stuck as well. Thanks ahead of time.
Here is what I have and if force closes on me:
Main Activity:
package com.mandam.ok;
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 UserInput extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
EditText edit = (EditText) findViewById(R.id.editText1);
Button button = (Button) findViewById(R.id.button1);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
EditText edit = (EditText)
findViewById(R.id.editText1);
Intent intent = new Intent(UserInput.this, GetText.class);
intent.putExtra("com.mandam.ok.GETTEXT",
edit.getText().toString());
startActivity(intent);
}
});
}
}
Second Activity:
package com.mandam.ok;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;
public class GetText extends Activity{
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main2);
TextView view = (TextView) findViewById(R.id.textView1);
Intent intent = getIntent();
String name = intent.getStringExtra("com.mandam.ok.MAIN");
//edit.setText(view.getText());
}
}
I will even attach my xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/hello" />
<EditText
android:id="#+id/editText1"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<requestFocus />
</EditText>
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
</LinearLayout>
Second xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
</LinearLayout>
And manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.mandam.ok"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="7" />
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name" >
<activity
android:label="#string/app_name"
android:name=".OkActivity" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:label="#string/app_name"
android:name=".GetText" >
<intent-filter >
<action android:name="com.mandam.ok.GETTEXT" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Now I know I am missing something very simple, just don't know what. I appreciate the help so far. :)

Your second activity HAS a textview... saying that it IS a textview is wrong since Activities are not Views.
Here's how you can pass arguments to a new Activity... this code would be in your first Activity's onClick:
EditText edit = (EditText) findViewById(R.id.editText1);
Intent intent = new Intent(UserInput.this, GetText.class);
intent.putExtra("com.package.name.NAME", edit.getText().toString());
startActivity(intent);
where "com.package.name" is your package name. An intent is an abstraction that performs an operation. In this case, the intent tells android to create a new Activity. The putExtra method allows you to put extra information into the intent before telling Android to create a new Activity. When you put an extra variable into an intent, you need to give it a unique string identifier that preferably starts with the package name.
Once the other Activity is created, here's how you can retrieve the string:
Intent intent = getIntent();
String name = intent.getStringExtra("com.package.name.NAME");
// do whatever you want with name