Develop Reference

tow button_click_event crushing together

I have tow on_click event in one activity linked to tow different buttons but what happened is when I press the first or second button the first on_click event is the one who is working!! here is the java code:
TextView user;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_student_activity);
user=findViewById(R.id.textView);
Intent i = getIntent();
String msg = i.getStringExtra(("msg"));
user.setText("welcome"+" "+msg+" choose a category");
}
public void science(View v){
Intent i = new Intent(this,science_first_activity.class);
startActivity(i);
}
public void art(View v)
{
Intent i = new Intent(this,art_first_activity.class);
startActivity(i);
}
and here is the xml:
<Button
android:id="#+id/button_s"
android:layout_width="258dp"
android:layout_height="65dp"
android:layout_alignParentStart="true"
android:layout_alignParentLeft="true"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_alignParentBottom="true"
android:layout_marginStart="77dp"
android:layout_marginLeft="77dp"
android:layout_marginEnd="76dp"
android:layout_marginRight="76dp"
android:layout_marginBottom="437dp"
android:onClick="science"
android:text="science" />
<Button
android:id="#+id/button_a"
android:layout_width="258dp"
android:layout_height="65dp"
android:layout_alignParentStart="true"
android:layout_alignParentLeft="true"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_alignParentBottom="true"
android:layout_marginStart="77dp"
android:layout_marginLeft="77dp"
android:layout_marginEnd="76dp"
android:layout_marginRight="76dp"
android:layout_marginBottom="328dp"
android:onClick="art"
android:text="art" />
no matter what button I click he will keep go to the science activity!

Start activity if view id are equal to avoid that.
public void science(View v){
if(view.getId==R.id.button_s){
Intent intentS = new Intent(this,science_first_activity.class);
startActivity(intentS );
}}
public void art(View v)
{
if(view.getId==R.id.button_a){
Intent intentA = new Intent(this,art_first_activity.class);
startActivity(intentA );
}}

start Activity B(called by onCreate of an Application Class's sub Class) on Top of Activity A(called by onResume of an Activity Class's sub Class)

I have 2 activities that involved in this question:
LoginActivity: A Login in Screen (called by a subclass of Activity Class)
Updater Activity: A Update Screen that show updating progress when new app version is availble (called by a subclass of Application Class)
This is what I want:
When the app FIRST LAUNCH, and if new version of the app is available, the UPDATER ACTIVITY should be on top of every activity include the Login Activity,
so it will be the first screen user see during first launch of the app.
only after the updating progress is done, the UPDATER ACTIVITY will be dismissed then Login Screen be on top.
However this is what actually happened:
The LOGIN ACTIVITY always on top of UPDATER ACTIVITY...
My Guess is that since the UPDATER ACTIVITY is called By APPLICATION CLASS's subClass, and the LOGINACTIVITY is called by an ACTIVITY CLASS sub class,
the Application class's method such as OnResume always get called before Activity onCreate Method, thus the LOGINACTIVITY always appear on top of UPDATER ACTIVITY,
I just wondering if there is anyway I could make my UPDATER ACTIVITY be on top of any activities including the LOGIN ACTIVITY?
//LoginActivity involved
public abstract ClassA extends Activity {
.....
.....
protected void onResume() {
super.onResume();
.....
if(isAuthenticated){
Intent intent = new Intent(this, LoginActivity.class)
.putExtra(...)
startActivityForResult(intent, XXX);
}
}
}
====
//Updater Activity involved
public abstract class ClassB extends Application {
....
....
....
public void onCreate() {
super.onCreate();
Intent updaterIntent = new Intent(this, UpdaterActivity.class);
updaterIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(updaterIntent);
}
}

i have diffrent solution instent of activity create dialog box activity.
public class ViewDialog {
public void showDialog(Activity activity, String msg){
final Dialog dialog = new Dialog(activity);
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setCancelable(true);
dialog.setContentView(R.layout.updatedialog);
TextView text = (TextView) dialog.findViewById(R.id.text_dialog);
text.setText(msg);
Button dialogUpdate = (Button) dialog.findViewById(R.id.update);
Button dialogcancel = (Button) dialog.findViewById(R.id.cancel);
Button dialogremindme = (Button) dialog.findViewById(R.id.remindeme);
TextView textView= (TextView) dialog.findViewById(R.id.machhint1);
TextView textView2= (TextView) dialog.findViewById(R.id.machhint2);
textView2.setText("Your old version is : "+versionName);
textView.setText("Current version in playstore : "+version);
dialogcancel.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
dialog.dismiss();
}
});
dialogUpdate.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
final String appPackageName = getPackageName(); // getPackageName() from Context or Activity object
try {
SharedPreferences.Editor editoradddetail1 = getSharedPreferences("later", MODE_PRIVATE).edit();
editoradddetail1.putString("days", "");
editoradddetail1.commit();
startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id=" + appPackageName)));
} catch (android.content.ActivityNotFoundException anfe) {
later="";
startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("https://play.google.com/store/apps/details?id=" + appPackageName)));
}
dialog.dismiss();
}
});
dialogremindme.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
SharedPreferences.Editor editoradddetail1 = getSharedPreferences("later", MODE_PRIVATE).edit();
Date someDate = new Date(); // Or whatever
Date dayAfter = new Date(someDate.getTime() + TimeUnit.DAYS.toMillis( 2 ));
DateFormat dateFormat=new SimpleDateFormat("dd/MM/yyyy");
String formattedDate=dateFormat.format(dayAfter);
editoradddetail1.putString("days", formattedDate);
editoradddetail1.commit();
dialog.dismiss();
}
});
dialog.show();
}
}
//and xml is.
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="250dp"
xmlns:android="http://schemas.android.com/apk/res/android">
<RelativeLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="250dp"
>
<RelativeLayout
android:layout_width="match_parent"
android:id="#+id/main"
android:background="#FFed6904"
android:layout_height="120dp">
<TextView
android:id="#+id/machhint"
android:text="Note:- Your current Version Did Not Match"
android:layout_width="match_parent"
android:textColor="#color/white"
android:textSize="13dp"
android:layout_height="60dp" />
<TextView
android:id="#+id/machhint1"
android:text="preschool version is"
android:layout_width="wrap_content"
android:textSize="13dp"
android:textColor="#color/white"
android:layout_below="#+id/machhint"
android:layout_height="wrap_content" />
<TextView
android:id="#+id/machhint2"
android:text="Your Vertion is :"
android:layout_width="wrap_content"
android:textColor="#color/white"
android:textSize="13dp"
android:layout_below="#+id/machhint1"
android:layout_height="30dp" />
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:id="#+id/text1"
android:layout_below="#+id/main"
android:layout_height="40dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TEXTO"
android:id="#+id/text_dialog"
android:layout_marginTop="3dp"
android:layout_marginLeft="4dp"
android:layout_marginRight="4dp"
android:layout_marginBottom="3dp"
android:textSize="18sp"
android:textColor="#ff000000"
android:layout_centerHorizontal="true"
android:gravity="center_horizontal" />
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_below="#+id/text1"
android:gravity="center_vertical|center_horizontal"
android:layout_height="55dp">
<Button
android:layout_width="wrap_content"
android:layout_height="45dp"
android:text="Update"
android:id="#+id/update"
android:gravity="center"
android:layout_toLeftOf="#+id/remindeme"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="45dp"
android:text="Later"
android:id="#+id/remindeme"
android:gravity="center"
android:layout_centerHorizontal="true"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="45dp"
android:text="Cancel"
android:id="#+id/cancel"
android:gravity="center"
android:layout_toRightOf="#+id/remindeme"
android:layout_centerHorizontal="true"
/>
</RelativeLayout>
</RelativeLayout>
</android.support.v7.widget.CardView>

Android Second activity does not load

Sorry for my English.
I'm trying to use a second activity in Android, but it doesn't load. It's like the code jump it. Below, you can see the code. Thanks.
1- First Activity
public class MainActivity extends Activity
{
Button button;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
addListenerOnButton();
public void addListenerOnButton() {
final Context context = this;
button = (Button) findViewById(R.id.btenviardados);
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
System.out.println("helooo");
Intent intent = new Intent(MainActivity.this, com.example.seven.reader.activity_janela1.class);
startActivity(intent);
System.out.println("ebadasdadas");
}
});
}
2- Second Activity
public class activity_janela1 extends Activity
{
public void OnCreate(Bundle saveInstaceState)
{
super.onCreate(saveInstaceState);
setContentView(R.layout.activity_janela1);
}}
3- First layout
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/linearLayout1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="I&apos;m screen 1 (main.xml)"
android:textAppearance="?android:attr/textAppearanceLarge" />
<Button
android:id="#+id/btenviardados"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Click me to another screen" />
4- Second layout
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/linearLayout1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/layoutFormulario"
android:orientation="vertical">
</LinearLayout>
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Im screen 2 (main2.xml)"
android:textAppearance="?android:attr/textAppearanceLarge" />
5- AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.seven.reader"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="10" />
<application
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name" >
<activity
android:label="#string/app_name"
android:name=".MainActivity" >
<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="com.example.seven.reader.activity_janela1" >
</activity>
</application>
</manifest>

You have created a method within your oncreate. Remove that and leave it in onCreate.
///public void addListenerOnButton() {
button = (Button) findViewById(R.id.btenviardados);
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
System.out.println("helooo");
Intent intent = new Intent(MainActivity.this, com.example.seven.reader.activity_janela1.class);
startActivity(intent);
System.out.println("ebadasdadas");
}
});
You are misunderstanding how to use methods and scope. I recommend you do a read up on these things.

The problem is with your method addListenerOnButton().
You could define a method which will be executed when button is clicked via xml just add onClick attribute where you have defined your button.
As:-
<Button
android:id="#+id/btenviardados"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Click me to another screen"
android:onClick="click" />
And define click method in MainActivity.java
as:-
public void click(View view)
{
System.out.println("helooo");
Intent intent = new Intent(MainActivity.this, com.example.seven.reader.activity_janela1.class);
startActivity(intent);
System.out.println("ebadasdadas");
}
Or you can add OnClickListener in you onCreate method of MainActivity.

Try this, may help you:
public class MainActivity extends Activity
{
Button button;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button) findViewById(R.id.btenviardados);
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
System.out.println("helooo");
Intent intent = new Intent(getApplicationContext, activity_janela1.class);
startActivity(intent);
finish();
System.out.println("ebadasdadas");
}
});
}
}

Text Fields in android-studio

Can someone tell me how to use a Text Field with an onclick listener on a button in android studio and give me the xaml code too.

First you need write in xml file what you need, we need button and textview:
<Button
android:id="#+id/button1"
android:layout_width="70dp"
android:layout_height="30dp"
android:text="textEdit"
android:layout_marginLeft="5dp"
android:textColor="#fff"
android:layout_marginRight="2dp"
android:background="#333"
android:onClick="ButtonOneClick"
android:layout_marginBottom="4dp"
/>
<TextView
android:id="#+id/txtView"
android:layout_width="50dp"
android:layout_height="30dp"
android:hint="text view"
/>
After xml you need define this in class. Because we define android:onClick="ButtonOneClick" in xml,
we can just call it , and set what you want to do.
TextView tv;
tv =(TextView)findViewById(R.id.txtView);
public void ButtonOneClick(View view) {
tv.setText("Test");
}
Other method is to declare button to, and set onClickListener.
Button butt;
butt= (Button) findViewById(R.id.button1);
butt.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
tv.setText("Test")
}
});

in tampil.xml
<Button
android:id="#+id/button1"
android:text="PENCET"
android:onClick="onPencet" />
and in u're class, use public void nameonClick(view v){ statement }
public class Tampil {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
public void onPencet(View v){
**U're statement }
}

screen to screen command

Hi am new to android and have spent over 10 hours looking for this answer but i cant seem to find and understand it. I am at the main xml page. I am trying to create a button that goes to another page. I need the easiest and simplest way to do this. Can anyody please help me? Heres my code for my 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" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:padding="#dimen/padding_medium"
android:text="#string/hello_world"
tools:context=".MainActivity" />
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/textView1"
android:layout_centerHorizontal="true"
android:layout_marginTop="66dp"
android:text="Button" />
</RelativeLayout>

<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/textView1"
android:layout_centerHorizontal="true"
android:layout_marginTop="66dp"
android:text="Button" />
Go to your activity Initialize your button
Button btn=(Button)findViewById(R.id.button1);
// Register listener to button btn
btn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// your action
Intent newActivityIntent= new Intent(currentActivity.this, NewClass.class);
startActivity(newActivityIntent);
}
});

You can also do it different...
You can instantiate a Button in your Activity:
private Button button;
Inside the onCreate(Bundle bundle) method you find your button, as defined at this Activity XML, which is the one you used setContentView(R.layout.yourxml);:
button = (Button) findViewById(R.id.button);
Then you use an OnClickListener:
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Perform action on click
}
});
Inside the onClick method, you instantiate an Intent
Intent intent = new Intent(CurrentActivity.this, ActivityToGo.class);
CurrentActivity = the one you are, and ActivityToGo the one you want to load.
startActivity();
Read the basics on Android here.

public class MyActivity extends Activity implements OnClickListener {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Button button = (Button) findViewById(R.id.button1);
button.setOnClickListener(this);
}
public void onClick(View v) {
// Use a switch on v.getId() if you have multiple clickable views.
// Since there's just one button, ...
Intent intent = new Intent(this, TargetActivity.class;
startActivity(intent);
}
}

You have to learn How to switch between Activities/Screens in Android, you can find here a well explained tutorial for beginners

This process is documented on the website concerning buttons. Google search Android Button
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/textView1"
android:layout_centerHorizontal="true"
android:layout_marginTop="66dp"
android:text="Button"
android:clickable="true"
android:onClick"insertMethodNameHere"
/>
This will call the method you define in the onClick tag, then start a new activity or update the view. Whatever you need to do