I encountered an issue and couldn't resolve in Android Studio. The setOnClickListener remains red and doesn't work unless I get rid of my "loseStarter1" button name.
Note: Starter1 is a button, I'm trying to make it disappear when clicked by the user. My real code starts when I introduce the loseStarter1 button.
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class game1 extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game1);
}
Button loseStarter1;
loseStarter1 = (Button) findViewById(R.id.Starter1);
loseStarter1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
loseStarter1.setVisibility(View.GONE);
}
})
}
Much appreciated.
You're missing a semicolon to end the new View.OnClickListener() { ... statement as well as that block not being inside of a method.
Not only move this code into the onCreate method, make sure you end it with a semicolon.
loseStarter1 = (Button) findViewById(R.id.Starter1);
loseStarter1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
loseStarter1.setVisibility(View.GONE);
}
}); // Add the semicolon here
It should look like this:
public class game1 extends AppCompatActivity {
Button loseStarter1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game1);
loseStarter1 = (Button) findViewById(R.id.Starter1);
loseStarter1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
loseStarter1.setVisibility(View.GONE);
}
}); //added semicolon
} // ends onCreate method
} // ends class
Your Button variable declaration and OnClickListener initialization is outside of the onCreate() method. Use the following code:
package com.cutting_edge_tech.mentalenhancementapp;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class game1 extends AppCompatActivity {
private Button loseStarter1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game1);
loseStarter1 = (Button) findViewById(R.id.Starter1);
loseStarter1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
loseStarter1.setVisibility(View.GONE);
}
});
}
}
Move below code inside onCreate()
loseStarter1 = (Button) findViewById(R.id.Starter1);
loseStarter1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
loseStarter1.setVisibility(View.GONE);
}
});
This is how i do it.
1) first make the class implement the interface View.OnClickListener, this let you handle the button clic event:
public class game1 extends AppCompatActivity implements View.OnClickListener;
2) second create the interface method to handle event.
#Override
public void onClick(View view)
{
if(view.getId()==R.id.Starter1)
{
view.setVisibility(View.GONE);
}
}
3) OnCreate methods is the best way to find objects and set properties.
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game1);
loseStarter1= (Button) findViewById(R.id.Starter1);
if(loseStarter1!=null){
loseStarter1.setOnClickListener(this);
}
}
all code :
package com.cutting_edge_tech.mentalenhancementapp;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class game1 extends AppCompatActivity implements View.OnClickListener {
private Button loseStarter1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game1);
loseStarter1 = (Button) findViewById(R.id.Starter1);
if(loseStarter1!=null){
loseStarter1.setOnClickListener(this);
}
}
#Override
public void onClick(View view)
{
if(view.getId()==R.id.Starter1)
{
view.setVisibility(View.GONE);
}
}
}
Advice:
Rename class to Game1.
Related
package com.example.application;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
private Button button2;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button2 = findViewById(R.id.button2);
button2.setOnClickListener(new View.OnClickListener());
#Override
public void onClick(View v)
Intent intent = new Intent(this, ClaimApplication.class);
startActivity(intent);
}
}
I have error such as 'OnClickListener' is abstract; cannot be instantiated and Cannot resolve symbol 'v'
I am a new programmer so please someone help!
You cannot instantiate abstract classes, so the new View.OnClickListener() gives the error.
As said in the Android Doc (https://developer.android.com/reference/android/widget/Button), try this
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Code here
}
});
and for keeping the code as simple as possible I suggest to call a method inside the onClick(),
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
myMethod();
}
});
}
public void myMethod(){
//codehere
}
First of all, please don't mark it a duplicate. I found similar question on stackoverflow.com but I could not find my solution. Please look at this image
Screenshot
I am trying to check that EditText should not be empty. But the setOnClickListener is displayed in red. I tried solutions suggested in other similar questions and mentioned import android.view.View.OnClickListener; but still it is not working.
So, any help that could help me solve the problem from anyone is really appreciated.
This is the java file
package com.example.rtrjs.abc;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.view.View.OnClickListener;
public class Signup extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_signup);
getSupportActionBar().setTitle("Sign up");
}
EditText edittext=(EditText)findViewById(R.id.etfn);
Button buton=(Button)findViewById(R.id.breg);
buton.setOnClickListener(new OnClickListener())
}
When it showed error I didnot proceed further.
First you are not inside any method, so you will not be able to assign the listener, second you are missing the onClick method inside de OnClickListener. Try this:
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
...
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//do your stuff
}
});
}
Because you're not in the onCreate() method
EDIT :
Try this way :
package com.example.rtrjs.abc;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.view.View.OnClickListener;
public class Signup extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_signup);
getSupportActionBar().setTitle("Sign up");
EditText edittext=(EditText)findViewById(R.id.etfn);
Button button=(Button)findViewById(R.id.breg);
button.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View v) {
//process
}
});
}
}
Also I suggest you to use the string.xml file for your "Sign up" in order to be prepared for multi language support ;)
You should write the OnClickListener function code for your Button and EditText in the OnCreate method like this
public class Signup extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_signup);
getSupportActionBar().setTitle("Sign up");
EditText edittext=(EditText)findViewById(R.id.etfn);
Button button=(Button)findViewById(R.id.breg);
button.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View v) {
//process
}
});
}
}
Update your code to this:
public class Signup extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_signup);
getSupportActionBar().setTitle("Sign up");
EditText edittext=(EditText)findViewById(R.id.etfn);
Button button=(Button)findViewById(R.id.breg);
button.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View view) {
// logic here
}
});
}
}
Android app, i wrote to test image button doesn't work. I have created a image button and implement an event listener for that button. What's wrong with this source code?
import android.view.View;
import android.view.View.OnClickListener;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ImageButton;
import android.widget.Toast;
public class ImageButtonTestApp extends Activity {
ImageButton imageButton;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
public void eventListenerOnButton() {
imageButton = (ImageButton) findViewById(R.id.imageButton1);
imageButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
Toast.makeText(ImageButtonTestApp.this, "ImageButton is clicked!", Toast.LENGTH_SHORT).show();
}
});
}
}
u have written setOnClickListener in different method but u didnot call that method any where call that method in oncreate.
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
eventListenerOnButton();
}
try this one,
Try it
imageButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
Toast.makeText(ImageButtonTestApp.this, "ImageButton is clicked!", Toast.LENGTH_SHORT).show();
}
});
This is my starting activity. I'm trying to get this button to work but it's been giving me this error.
Line 15 button can not be resolved.
package com.synamegames.giveaway;
import android.view.View.OnClickListener;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class GiveawayActivity extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final Button register = (Button) findViewById(R.id.register);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// Perform action on clicks
}
});
setContentView(R.layout.main);
}
}
Please try this..
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final Button register = (Button) findViewById(R.id.register);
register.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Perform action on clicks
}
});
}
The problem is You have defined the Button instances as register in the line final Button register = (Button) findViewById(R.id.register); But you are setting onclick listener to the button instance which is not defined. You should have
register.setOnClickListener(new OnClickListener() {
instead of
button.setOnClickListener(new OnClickListener() {
U can use android:onClick from xml and pass a the view into the .java file
eg:
android:onClick="bactToList"
in java:
public void bactToList(View view){
}
The first button works fine, but when I click to the second, nothing happens. I'm not getting any errors, I can't see what's wrong.
Sounds.java
package com.andrew.finnandjake;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class Sounds extends Activity {
private SoundManager mSoundManager;
/** Called when the activity is first created. */
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mSoundManager = new SoundManager();
mSoundManager.initSounds(getBaseContext());
mSoundManager.addSound(1, R.raw.finn_whatthejugisthat);
Button b1 = (Button)findViewById(R.id.Button1);
b1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
mSoundManager.playSound(1);
}
});
}
public void onCreate1(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mSoundManager = new SoundManager();
mSoundManager.initSounds(getBaseContext());
mSoundManager.addSound(2, R.raw.jake_dancingwithbabes);
Button b2 = (Button)findViewById(R.id.Button2);
b2.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
mSoundManager.playSound(2);
}
});
}
}
You can't randomly create a method like you're doing with onCreate1, it's never executed by you or by your Activity.
This is all you need:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mSoundManager = new SoundManager();
mSoundManager.initSounds(this);
mSoundManager.addSound(1, R.raw.finn_whatthejugisthat);
mSoundManager.addSound(2, R.raw.jake_dancingwithbabes);
Button b1 = (Button)findViewById(R.id.Button1);
b1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
mSoundManager.playSound(1);
}
});
Button b2 = (Button)findViewById(R.id.Button2);
b2.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
mSoundManager.playSound(2);
}
});
}
You aren't assigning the onclick listener inside the actual OnCreate. This should work:
package com.andrew.finnandjake;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class Sounds extends Activity {
private SoundManager mSoundManager;
/** Called when the activity is first created. */
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mSoundManager = new SoundManager();
mSoundManager.initSounds(getBaseContext());
mSoundManager.addSound(1, R.raw.finn_whatthejugisthat);
mSoundManager.addSound(2, R.raw.jake_dancingwithbabes);
Button b1 = (Button)findViewById(R.id.Button1);
b1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
mSoundManager.playSound(1);
}
});
Button b2 = (Button)findViewById(R.id.Button2);
b2.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
mSoundManager.playSound(2);
}
});
}