I have a program and when I try to start it, it crashes. I really don't understand why, even Eclipse show's that there are no errors.
I can show you the code of a page on which I think is the problem.
package ctect.android.maxipro;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
public class BasicScreenActivity extends Activity {
private Button butonul1;
private Button butonul2;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_basic_screen);
butonul1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View currentView) {
// TODO Auto-generated method stub
butonul2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View currentView) {
// TODO Auto-generated method stub
Intent myIntent = new Intent(currentView.getContext(), NeedForSpeedActivity.class);
startActivityForResult(myIntent, 0);
Intent myIntent2 = new Intent(currentView.getContext(), Fifa2012Activity.class);
startActivityForResult(myIntent2, 0);
}
});
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.basic_screen, menu);
return true;
}
}
if somebody understands, please help me.
You forgot to assign an object to butonul1 before using it. You need to add this line before butonul1.setOnClickListener:
butonul1= (Button) findViewById(R.id.butonul1);
This is assuming that you gave it the id butonul1 in your layout file.
Related
Consider:
package com.example.practicealpha;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
public class MainActivity extends Activity implements OnClickListener {
Button next,previous;
ImageView image;
Integer[] id;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
id[0] = R.drawable.aa;
id[1] = R.drawable.bb;
id[2] = R.drawable.cc;
id[3] = R.drawable.dd;
next=(Button)findViewById(R.id.buttonNext);
previous=(Button)findViewById(R.id.buttonPrevious);
image=(ImageView)findViewById(R.id.imageView1);
// image.setImageDrawable(id[0]);
// image.setImageResource(id[i]);
/*
next.setOnClickListener(new Button.OnClickListener(){
public void onClick(View v)
{
if (i<=3)
{
i++;
image.setImageResource(id[i]);
if(i==4)
next.setEnabled(false);
}
}
});
previous.setOnClickListener(new Button.OnClickListener(){
public void onClick(View v)
{
if(i>=1)
{
i--;
image.setImageResource(id[i]);
if(i==0)
next.setEnabled(false);
}
}
});
*/
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
}
id[0] = R.drawable.aa;
This line is causing my app to stop forcefully. How can I fix this problem?
I am trying to intialise an integer array with images id and then trying to go through the image listed in drawable folder.
Change
Integer[] id;
to
int[] id;
You have to initialize the ids for the size:
int[] id = new int[size];
You cannot use the id array directly. Initialise it first:
id[0] = R.drawable.aa;
sorry for this again button i ant figure out the correct placement here. i just want it on this class only to exit the app when back pressed but i cant figure out what exactly to write or where to write it. thanks for the help. code of class below.
package com.example.whattodo2;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.RelativeLayout;
public class Title extends Activity {
Button reset, rts;
ImageView title;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_title);
reset = (Button) findViewById(R.id.reset);
reset.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
double rand = Math.random();
if(rand < 0.5){
Intent reset1 = new Intent(Title.this, MainActivity.class);
startActivity(reset1);
} else {
Intent reset2 = new Intent(Title.this, Question36.class);
startActivity(reset2);
}
}
});
rts = (Button) findViewById(R.id.rts);
rts.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Intent rts=new Intent(Title.this,Rts.class);
startActivity(rts);
}
});
final Animation a = AnimationUtils.loadAnimation(this, R.animator.animation);
a.reset();
final ImageView rImage = (ImageView) findViewById(R.id.title);
RelativeLayout layout = (RelativeLayout) findViewById(R.id.root);
layout.setOnClickListener(new OnClickListener() {
#Override public void onClick(View v) {
rImage.startAnimation(a);
func(); //A call to the function.
}
});
}
protected void func() {
// TODO Auto-generated method stub
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.title, menu);
return true;
}
}
Use like this:
public class Title extends Activity {
#Override
public void onBackPressed() {
// TODO Auto-generated method stub
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
super.onBackPressed();
}
}
hope this will give you some solution.
Before onCreate in all the activities:
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK)) {
Intent intent=new Intent (Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
// finish();
}
return true;
}
I have just started to learn how to program android apps, And im a COMPLETE NOOB.
I cant figure out how to fix this! please help! The format may look butchered... It's cause i have no clue what im doing!
package com.smiggle.bmxhandbook;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.content.Intent;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
Button button;
public void onCreate1(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
addListenerOnButton();
}
public void addListenerOnButton() {
button = (Button) findViewById(R.id.button1);
button.setOnClickListener(new OnClickListener() {
public void onClick1(View arg0) {
Intent myIntent = new Intent(MainActivity.this, Trick.class
MainActivity.this.startActivity(myIntent);
}
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub; }
}
It keeps on giving me a syntax error!
Try this code instead:
public class MainActivity extends Activity {
Button button;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
addListenerOnButton();
}
public void addListenerOnButton() {
button = (Button) findViewById(R.id.button1);
button.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
Intent myIntent = new Intent(MainActivity.this, Trick.class);
MainActivity.this.startActivity(myIntent);
}
});
}
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
Your class had a ridiculously high amount of syntax and logical errors:
Arbitrary onCreate1() method, which will never me called.
Arbitrary onClick() method, even though your Activity never implemented the interface
Your anonymous inner class' onClick() method was named onClick1()
The statement with the Intent was missing a ); at the end.
The inner class body was missing a closing });
The addListenerOnButton() method was missing a closing }
Your entire class was missing a closing }
I sincerely recommend you spend a few months (or even a year) learning Java before coming to Android.
You have this wide open
Intent myIntent = new Intent(MainActivity.this, Trick.class
You need to close that with a right parenthesis and and a semicolon.
Also that onClick should not have a 1 in it:
public void onClick1(View arg0) {
on clicking the button the 'x' value is storing in array[0][0]. But in the check method both if statements in the for loop are exicuting , i don't know why the conditions are exicuting.
So i put a dialogue box in the if statement, while i am giving the array[0][0] to setMessage
it printing "x", But if i am giving the array[i][j] it printing the null value even both i and j values are zero.
i don't know what is the problem.
package com.example.tictactoe3;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.app.AlertDialog;
public class MainActivity extends Activity {
String array[][]=new String[3][3];
void check(String array[][])
{
int i=0,j=0;
for(i=0;i<3;i++)
{
for(j=0;j<1;j++)
{
if(array[i][j]==array[i][j+1])
{
if(array[i][j]==array[i][j+2])
{
AlertDialog.Builder dlgAlert = new AlertDialog.Builder(this);
dlgAlert.setMessage(array[0][0]);
dlgAlert.setTitle("Tic Tac Toe");
dlgAlert.setPositiveButton("OK", null);
dlgAlert.setCancelable(true);
dlgAlert.create().show();
}
}
}
}
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Button bt1= (Button) findViewById(R.id.button1);
bt1.setOnClickListener(new View.OnClickListener() {
boolean value=true;
public void onClick(View v) {
// TODO Auto-generated method stub
bt1.setText("x");
array[0][0]="x";
check(array);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
For strings, you should compare using
if (strOne.equals(strTwo))
or
if (strOne.equalsIgnoreCase(strTwo))
Not using "==" operator
So replace
if(array[i][j]==array[i][j+1])
with
if(array[i][j].equalsIgnoreCae(array[i][j+1]))
and
if(array[i][j]==array[i][j+2])
with
if(array[i][j].equalsIgnoreCase(array[i][j+2]))
I have made a simple android project with a single activity containing three buttons and a seek bar,Now i want is that when i press 1st button the seek bar should directly progressed 33%(without showing progress),when 2nd button pressed the seek bar should progressed again by 33% second time and when third button pressed the seek bar should full progressed..my code is as below:
Main.java
package com.example.seekabardemo;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.SeekBar;
public class MainActivity extends Activity {
Button btn,btn1,btn2;
SeekBar sk;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn=(Button)findViewById(R.id.button1);
btn1=(Button)findViewById(R.id.button2);
btn2=(Button)findViewById(R.id.button3);
sk=(SeekBar)findViewById(R.id.seekBar1);
btn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
});
btn1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
});
btn2.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
Thank you....Please help me..!
Please help me ..thank you..!
write this three statements in click events of each button respectively.
sk.setProgress(sk.getMax()/3);
sk.setProgress(sk.getMax()*2/3);
sk.setProgress(sk.getMax());
To set a seekBar progress just :
sk.setProgress(ProgressToSet);
to get the maximum possible progress just:
sk.getMax();
to get a porcentage of a seekbar just:
sk.setProgress(sk.getMax()/100*YourPercentage);