Good afternoon,
I am trying to create a basic menu in my andorid application which contains 5 buttons each bringing you to another form. I am trying to create the java to carry out this action but appear to be running into the following error with each of my buttons
"EXAMPLE cannot be resolved as a variable"
Please help me in a solution to my code or if there is a simpler way to allow me to execute this menu with 5 buttons each going to a different form
<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="com.techblogon.loginexample.MainMenu" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:src="@drawable/pic" />
<Button
android:id="@+id/btnFootball"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/imageView1"
android:layout_centerHorizontal="true"
android:layout_marginTop="25dp"
android:text="Football"
android:onClick="btnFootball" />
<Button
android:id="@+id/btnHockey"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/btnFootball"
android:layout_centerHorizontal="true"
android:layout_marginTop="25dp"
android:text="Hockey"
android:onClick="btnHockey" />
<Button
android:id="@+id/btnLacrosse"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/btnLacrosse"
android:layout_centerHorizontal="true"
android:layout_marginTop="25dp"
android:text="Lacrosse"
android:onClick="btnLacrosse" />
<Button
android:id="@+id/btnCurling"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/btnLacrosse"
android:layout_centerHorizontal="true"
android:layout_marginTop="25dp"
android:text="Curling"
android:onClick="btnCurling" />
<Button
android:id="@+id/btnLogout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/btnCurling"
android:layout_centerHorizontal="true"
android:layout_marginTop="25dp"
android:text="Logout"
android:onClick="btnLogout" />
</RelativeLayout>
Here is the Java:
package com.techblogon.loginexample;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.view.View.OnClickListener;
import android.content.Context;
import android.view.Menu;
import android.view.MenuItem;
public class MainMenu extends Activity {
public void ButtonOnClick(View v) {
switch (v.getId()) {
case R.id.btnFootball:
startActivity(Football);
break;
case R.id.btnHockey:
startActivity(Hockey);
break;
case R.id.btnLacrosse:
startActivity(Lacrosse);
break;
case R.id.btnCurling:
startActivity(Curling);
break;
case R.id.btnLogout:
startActivity(HomeActivity);
break;
}
}
}
@Meryl2
When u are using
""android:onClick="btnLogout"""
Then you should have corresponding method
public void btnLogout(View view{
//your code here
}
Same applies for all buttons in your code
Your Mistakes ->
You have not used setcontentView() nor you overridden onCreate() method. One more thing, you are not sending intent correctly.
Here is how you can send intent
Intent intent = new Intent(getApplicationContext(), DestinationActivity.class);
startActivity(intent);
I have modified the class and the layout. You need to create the other classes for each action.
public class MainActivity extends Activity implements Button.OnClickListener{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public void onClick(View v) {
int id = v.getId();
Intent intent = null;
if(id == R.id.btnHockey) {
intent = new Intent(MainActivity.this, Hockey.class);
} else if(id == R.id.btnCurling) {
intent = new Intent(MainActivity.this, Curling.class);
} else if(id == R.id.btnFootball) {
intent = new Intent(MainActivity.this, Football.class);
} else if(id == R.id.btnLogout) {
intent = new Intent(MainActivity.this, Logout.class);
} else if(id == R.id.btnLacrosse) {
intent = new Intent(MainActivity.this, Lacrosse.class);
}
startActivity(intent);
}
}
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/imageView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"/>
<Button
android:id="@+id/btnFootball"
android:layout_below="@id/imageView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="25dp"
android:text="Football"
android:onClick="onClick" />
<Button
android:id="@+id/btnHockey"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/btnFootball"
android:layout_marginTop="25dp"
android:text="Hockey"
android:onClick="onClick" />
<Button
android:id="@+id/btnLacrosse"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/btnHockey"
android:layout_marginTop="25dp"
android:text="Lacrosse"
android:onClick="onClick" />
<Button
android:id="@+id/btnCurling"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/btnLacrosse"
android:layout_centerHorizontal="true"
android:layout_marginTop="25dp"
android:text="Curling"
android:onClick="onClick" />
<Button
android:id="@+id/btnLogout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/btnCurling"
android:layout_centerHorizontal="true"
android:layout_marginTop="25dp"
android:text="Logout"
android:onClick="onClick" />
I think i got your problem. In each Button you set the name of the method that will be used when you click on it :
android:onClick="btnCurling"
android:onClick="btnHockey"
...
But you only have one method here which is :
public void ButtonOnClick(View v) {
...
}
One solution is to define each method like so :
public class MainMenu extends Activity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// here you tell your activity what layout he will display
setContentView(R.layout.TheNameOfYourLayout);
}
// it will get there when you click on the "@+id/btnHockey" Button
public void btnHockey(View v) {
Intent intent = new Intent(this, NameOfTheActivityToLaunch.class);
startActivity(intent);
}
// then you add the other ones btnCurling, ...
}
Another solution is to set the Listener of each button programmatically :
public class MainMenu extends Activity implements View.OnClickListener {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Here you tell your activity what layout he will display
setContentView(R.layout.TheNameOfYourLayout);
// This will find your button in the layout you just set
// and then set this Class as your Listener
findViewById(R.id.btnFootball).setOnClickListener(this);
// Then set the listener of all your other buttons
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btnFootball:
Intent intent = new Intent(this, NameOfTheActivityToLaunch.class);
startActivity(intent);
break;
case R.id.btnHockey:
Intent intent = new Intent(this, NameOfTheActivityToLaunch.class);
startActivity(intent);
break;
// ...
}
}
}
You also have to remove all the android:onClick="btnCurling" line in your XML Layout file for this solution to work.
Hope it helps cheers :)
Try this code;
public class MainMenu extends Activity implements OnClickListener {
Button btn_football,btn_hokey,btn_something; // add another button here
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.yourlayout);
btn_football = (Button)findViewById(R.id.btnFootball);
// add another button here same way
btn_football.setOnClickListener(this);
// add another button here same way
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch(v.getId()){
case R.id.btnFootball:
Intent intent = new Intent(MainMenu.this,(nextclass_addhere).class);
startActivity(intent);
break;
case R.id.another button:
Intent intent = new Intent(MainMenu.this,(nextclass_addhere).class);
startActivity(intent);
break;
//.......add here another button with same way
}
}
}
