Multiple activities and buttons?

Multiple activities and buttons? - java

I want to make buttons once I click on the button I go to another activity?
and the problem is only the first button is working!
public class Main extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button PageOneButton = (Button) findViewById(R.id.btnPageOne);
PageOneButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent myIntent = new Intent(v.getContext(), PageOne.class);
v.getContext().startActivity(myIntent);
Button PageTwo = (Button) findViewById(R.id.btnPageTwo);
PageTwoButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent myIntent = new Intent(v.getContext(), PageTwo.class);
v.getContext().startActivity(myIntent);
}
{}
});
}
});
}
}

Think it is because most of your code is closed inside the scope of the first onClickListener, try something like this.
Button PageOneButton = (Button) findViewById(R.id.btnPageOne);
PageOneButton.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
Intent myIntent = new Intent(Main.this, PageOne.class);
startActivity(myIntent);
});
Button PageTwoButton = (Button) findViewById(R.id.btnPageTwo);
PageTwoButton.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
Intent myIntent = new Intent(Main.this, PageTwo.class);
startActivity(myIntent);
});
Using v.getContext() should be ok, this is just how I usually would do as the Activity itself is indeed a valid context. I guess it just seems more readable to me.
Edit:
Just as a clarification to the current state of your code. The second button is assigned a onClickListener only after the first button is pressed. But since the first button takes the app to a new Activity, inherently destroying the Main Activity, the second button will never have a chance to reach it's onClickListener.
Hope it makes sense, nevertheless the code above should fix the issue.

There are a couple of issues currently in your code. The first issue is that your second button is being defined inside the first button's declaration. The next issue is that you're setting the second OnClickListener to the wrongly named button. You've made a typo and instead of PageTwo, which you've called the Button (presumably you wanted to call it PageTwoButton in accordance with the first Button) and then set the OnClickListener to PageTwoButton instead. Seeing as you're also using multiple Buttons, it's a lot cleaner and more efficient to use a GroupOnClickListener. I'd probably also suggest using 'this' instead of 'v.getContext()' as well when setting up your Intents. Change your code to be like so:
Button PageOneButton = (Button) findViewById(R.id.btnPageOne);
Button PageTwoButton = (Button) findViewById(R.id.btnPageTwo);
PageOneButton.setOnClickListener(addGroupOnClickListener);
PageTwoButton.setOnClickListener(addGroupOnClickListener);
private OnClickListener addGroupOnClickListener = new OnClickListener() {
public void onClick(View v) {
if (v == PageOneButton) {
Intent myIntent = new Intent(Main.this, PageOne.class);
startActivity(myIntent);
} else if (v == PageTwoButton) {
Intent myIntent = new Intent(Main.this, PageTwo.class);
startActivity(myIntent);
}
}
};
Hope this helps!

Two words: Code Indentation
Were you to indent your code properly, you would have noticed that you're setting OnClickListener INSIDE your first buttons' listener. Move it outside your first listener, as has already been advised by others.
There's also an extra pair of {}, which is redundant.
Also, #edwoollard noticed that for the second button, you're using two different names, PageTwo and PageTwoButton. Keep that in mind, unless it's a typo.

Related

OnClick generate different Events when you click multiple times

I'm trying to get my OnClick to generate differente events when I click once or twice.
On the first click the ImageView changes, on the second it pass to a different Activity.
Here's my code for now
public static int i=0;
final ImageView srt = findViewById(R.id.imageone);
Button apply = findViewById(R.id.apply);
apply.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
vibrator.vibrate(VibrationEffect.createOneShot(50, VibrationEffect.DEFAULT_AMPLITUDE));
if(i==0){
srt.setImageResource(R.drawable.imagetwo);
}else{
Intent intent = new Intent(MainActivity.this, SecondActivity.class);
startActivity(intent);
}
}
});
}
Right now if I click once the ImageView change, but the second click does not work and doesn't change the Activity.

I think Ritu Suman Mohanty in the comments is correct. You need to increment your value with i++; Right now, i == 0 is always true. Good luck!

ANDROID: launch new activity from inflated pop up view

I have a main_activity in which by pressing a button I launch a form to be completed:
popup= getLayoutInflater().inflate(R.layout.pop_up, null);
signup = new SignUp(popup);
register = (Button) findViewById(R.id.sign_up);
AlertDialog.Builder alertBuilder = new AlertDialog.Builder(MyLocalBartender.this);
alertBuilder.setView(popup);
final AlertDialog dialog = alertBuilder.create();
register.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
dialog.dismiss();
dialog.show();
}
});
By what you can see I'm using a second activity class (SignUp) to manage the form and not the root class from which it was launched (main_activity).
In this new class I set all the click listeners etc to verify the inputs through a third class that implements an OnClickListener.
Everything works fine until this point. But now I want to test the page/activity called HomePage in which the user should land to if the form is filled.
So what I don know is I remove the click listener from the previous handler and I create an anonymous one to simply open the new activity on register button pressed:
// signup_registerButton.setOnClickListener(new SignupListener(signup_emailField,signup_passwordField1,
// signup_passwordField2, signup_textTemp,signup_organiserRadio, signup_staffRadio,signup_alertMessage));
////*************************TEST******************* START
signup_registerButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent menu = new Intent(getApplicationContext(), HomePage.class);
startActivity(menu);
}
});
////*************************TEST******************* END
but this returns a NullPointerException.
I've tried to launch the HomePage.class from the main_activity directly and it works and also I've tried to launch the main activity from this REGISTER button, which didn't work, so this tells me that the problem it is somewhere here.

You need to pass an Activity Context to the Intent constructor. Activities context and Applications context are not the same. Activities context hold much more inforamtions.
In your case you can do like this:
signup_registerButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent menu = new Intent(yourActivity, HomePage.class);
startActivity(menu);
}
});
where yourActivity is your activity instance. You can pass it as variable or access it via main_activity.this from inner classes (Listeners) on anywhere inside your class.

How to pass variable from onClick to another class [duplicate]

This question already has answers here:
How do I pass data between Activities in Android application?
(53 answers)
Closed 7 years ago.
I was trying to pass a variable named choice to another class but I do not know how I should go along doing this because it is inside the onClick. Here is an example of what I am trying to do.
public int choice;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//intent for first button
Button button1= (Button) findViewById(R.id.button1);
button1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
choice = 1;
startActivity(new Intent(MainActivity.this,Celeb1.class));
}
});
//intent for second button
Button button2= (Button) findViewById(R.id.button2);
button2.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
choice = 2;
startActivity(new Intent(MainActivity.this,Celeb1.class));
}
});
}
In a different class I would like to check if choice is equal to 1 or 0 and execute some code.

You can pass variable by this way
Intent intent = new Intent(MainActivity.this,Celeb1.class)
intent.putExtra("choice", 1);
startActivity(intent);
And in Celeb1 class you can get variable by using
Bundle extras = getIntent().getExtras();
int choice= extras.getInt("choice");
inside onCreate()

//in main activity
Intent i=new Intent(getApplicationContext(),Celeb1.class);
i.putExtra("name","stack");//name is key stack is value
startActivity(i);
//In Celeb1 class
Intent i=getIntent();
String name=i.getStringExtra("name");

Do not make instance of Intent instead make object of Intent and pass extra values to your class
choice = 2;
Intent intent = new Intent(MainActivity.this, Celeb1.class);
intent.putExtra("choice",choice);
startActivity(intent);
That's It
I am android beginner, Hope It will help you.

Double Click on Button Android

First off this question has been asked multiple times, however, none of these questions have been answered to any extent. I have one example that works in the main activity class:
final Button button = (Button) findViewById(R.id.viewcatalog);
button.setFocusable(true);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
setContentView(R.layout.find_item);
}
});
But all of my other attempts to replicate this in sequential pages has resulted in failure. I know the reason that they won't work the same way is that my buttons are instantiated in other classes and not in the host class. What is the correct way to fix this error?
The method that doesn't work for reference:
public void OnClickSearch(View view) {
final Button button = (Button) findViewById(R.id.button2);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
EditText text = (EditText)findViewById(R.id.editText);
String value = text.getText().toString();
setContentView(R.layout.search_results);
}
});
}

It sounds like you are mis-understanding how the UI works in Android.
It is not normally expected that you will change an Activity's view on the fly as your are doing in your OnClickListener.
Instead, you should do one of two things. Either switch to a new Activity, using an Intent and the Activity's startActivity method, or use Fragments, and replace a Fragment in your Activity with a new Fragment.

How to navigate from one screen to another screen

How to navigate from one Activity screen to another Activity screen? In the first screen I'm having one button if I click the button it has to move to another Activity screen.

The most trivial case (called from activity):
startActivity(new Intent(this, ActivityToLaunch.class));
More details here: http://developer.android.com/guide/topics/fundamentals.html

OnClickListener onClickListener = new OnClickListener() {
#Override
public void onClick(View v) {
startActivity(new Intent(action));
}
};
Button button = (Button) findViewById(id);
button.setOnClickListener(onClickListener);

Button x.setOnClickListener(new View.OnClickListener() {
public void onClick(View v)
{
Intent i = new Intent(y.this, Activity.class);
startActivity(i);
}
});
Here we've defined a listener for Button x. The OS will call this method and start the Activity referenced in Intent i.
Here's the official tutorial example:
http://developer.android.com/guide/tutorials/notepad/notepad-ex2.html

Button btn = (Button)findViewById(R.id.button1);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
startActivity(new Intent(TestActivity.this,second.class));
}
});

public void onClick(View v)
{
Intent myintent = new Intent(currentclass.this, nextactivity.class);
startActivity(myintent);
}

This task can be accomplished using one of the android's main building block named as Intents and One of the methods public void startActivity (Intent intent) which belongs to your Activity class.
An intent is an abstract description of an operation to be performed. It can be used with startActivity to launch an Activity, broadcastIntent to send it to any interested BroadcastReceiver components, and startService(Intent) or bindService(Intent, ServiceConnection, int) to communicate with a background Service.
An Intent provides a facility for performing late runtime binding between the code in different applications. Its most significant use is in the launching of activities, where it can be thought of as the glue between activities. It is basically a passive data structure holding an abstract description of an action to be performed.
Refer the official docs -- http://developer.android.com/reference/android/content/Intent.html
public void startActivity (Intent intent) -- Used to launch a new activity.
So suppose you have two Activity class and on a button click's OnClickListener() you wanna move from one Activity to another then --
PresentActivity -- This is your current activity from which you want to go the second activity.
NextActivity -- This is your next Activity on which you want to move.
So the Intent would be like this
Intent(PresentActivity.this, NextActivity.class)
Finally this will be the complete code
public class PresentActivity extends Activity {
protected void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.content_layout_id);
final Button button = (Button) findViewById(R.id.button_id);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Perform action on click
Intent activityChangeIntent = new Intent(PresentActivity.this, NextActivity.class);
// currentContext.startActivity(activityChangeIntent);
PresentActivity.this.startActivity(activityChangeIntent);
}
});
}
}
This exmple is related to button click you can use the code anywhere which is written inside button click's OnClickListener() at any place where you want to switch between your activities.

final Context cont = this;
Button btnClickABC =(Button)findViewById(R.id.btnClickABC);
btnClickABC.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
startActivity(new Intent(cont, NextActivity.class));
}
});

Use following code..I hope this will help you.
Button button = (Button)findViewById(R.id.xxx);
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent intent=new Intent(CurrentActivity.this,NextActivity.class);
startActivity(intent);
}
});
xxx is id from your xml of your Button.

startActivity(new Intent(this,newActivity.class));

Switching from one activity to another is really simple, but tricky for a new one.
Your next class must be defined in AndroidManifest.xml. This is tester class:
<activity
android:name=".Tester"
android:label="#string/title_activity_tester" >`enter code here`
</activity>
final Button button = (Button) findViewById(R.id.btnGo);// btnGo is id
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent i = new Intent(CurrentClass.this, Tester.class);
startActivity(i);
}

You can navigate to the next screen using these code snippets:
Kotlin
startActivity(Intent(this, LoginActivity::class.java))
Java
startActivity(new Intent(this, LoginActivity.class))
Here's a reference: Android Developers - Starting another activity

Intent intentobj=new Intent(FromActivity.this,ToActivity.class);
startActivity(intentobj);
or you can simply use
startActivity(new Intent(FromActivity.this,ToActivity.class));

For Kotlin (if you are in an activity)
buttonToClick.setOnClickListener{ startActivity(this,YourDestinationActivity::class.java)
}
If you are in a fragment
buttonToClick.setOnClickListener{
startActivity(requireActivity, YourDestinationActivity::class.java)
}

In your method fun onCreate(savedInstanceState: Bundle?) add this.
your_btn_id.setOnClickListener{
val intent = Intent(this, yourpagename::class.java)
startActivity(intent)
}
Until now if it doesn't work then, check if these two files are added or not,
import android.content.Intent
import kotlinx.android.synthetic.main.activity_otp.*

Try this code:
Button my_btn;
my_btn = findViewById(R.id.submit_btn);
my_btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
setContentView(R.layout.activity_2);
}
});

Button navigate;
navigate = findViewById(R.id.button);
navigate.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(),"Navigate another Activity",Toast.LENGTH_LONG).show();
Intent intent = new Intent(MainActivity.this,MainActivity2.class);
startActivity(intent);
}
});

Just go to XML file and add Onclick = "opennewactivity" in button xml.
Then go to java code and create class opennewactivity you can just make it my clciking alt+Enter in xml code's "opennewactivity". in that just write
Intent intent = new Intent(this, newacivity.class);
startActivity(intent);
and if you want user to not get back to first activity again then just write this
Intent intent = new Intent(this, newactivity.class);
startActivity(intent);
finish();

Cartoon_card.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v)
{
newActivity();
}
});
}
public void newActivity()
{
Intent selectClass= new Intent(getApplicationContext(), com.example.fyp.videoplayer.class);
startActivity(selectClass);
}

Develop Reference

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Multiple activities and buttons? - java

Related

OnClick generate different Events when you click multiple times

ANDROID: launch new activity from inflated pop up view

How to pass variable from onClick to another class [duplicate]

Double Click on Button Android

How to navigate from one screen to another screen

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