Displaying Another Screen Onclick in Android

Displaying Another Screen Onclick in Android - android

package com.example.example;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.widget.Button;
import android.view.View;
import android.view.View.OnClickListener;
public class MainActivity extends Activity {
Button btn;
#Override
public void onCreate(Bundle savedInstanceState) {
this.setContentView(R.layout.activity_main);
this.btn = (Button)this.findViewById(R.id.button);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this.btn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, profile.class);
startActivity(intent);
}
});
}
}
I don't get any errors however my program also dont run as I want. I am new in android and I want to change the screen after the button is clicked for that I am using two classes so in one class my program should invoke another one onclick. How can I do this ? My code is as above.

First remove this.setContentView(R.layout.activity_main); because you declared it twice . Then declare
btn = (Button)this.findViewById(R.id.button);
after
setContentView(R.layout.activity_main);
Declare your profile activity in manifest file.Check my code below.
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn = (Button)this.findViewById(R.id.button);
btn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, profile.class);
startActivity(intent);
}
});

1) your oncreate method should look like below one.
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn = (Button)this.findViewById(R.id.button);
btn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, profile.class);
startActivity(intent);
}
});
2) Add profile Activity into Manifest.
3) add logs in onClick method so you should know if it is getting called on not.
Happy coding!!

Related

How to start an activity in Android?

I am very new to android programming. I want to use a code that takes me to MainActivity from my current activity on a click of a Button.
Here is my current code:
package com.example.flashlightapp;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class Whitelight extends Activity implements OnClickListener {
Button b1 = (Button) findViewById(R.id.b3);
Intent i = new Intent(this, MainActivity.class);
{
this.startActivity(i);
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_whitelight);
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
}
What should I put in
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
}

At first you must check if you declared all your activities in the manifest.xml file.
and in your Java code try this:
package com.example.flashlightapp;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class Whitelight extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_whitelight);
Button b1 = (Button) findViewById(R.id.b3);
b1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(Whitelight.this, MainActivity.class);
this.startActivity(i);
}
});
}
}
This tutorial explains how to use intents and listeners : http://goo.gl/phLWkx

Try this..
public class Whitelight extends Activity implements OnClickListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_whitelight);
Button b1 = (Button) findViewById(R.id.b3); // Initialization of Button
b1.setOnClickListener(this); // Initialization of ClickListener to the Button
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(this, MainActivity.class);
startActivity(i);
}
}
Follow the links
http://developer.android.com/index.html
http://developer.android.com/training/index.html
http://www.mkyong.com/tutorials/android-tutorial/

Use following :
Button b1;
public class Whitelight extends Activity implements OnClickListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_whitelight);
b1 = (Button) findViewById(R.id.b3); // Initialization of Button
b1.setOnClickListener(this); // Initialization of ClickListener to the Button
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(v==b1){
Intent i = new Intent(this, MainActivity.class);
startActivity(i);
}
}
}
in onClick(...) :
you can choose if your button is press then perform specific activity, in your case if you press b1 button then perform button specific activity :
so we can check view v==b1 button. if you want to more button then
if(v==b1){
Intent i = new Intent(this, MainActivity.class);
startActivity(i);
}
else if(v==b2)
{
// perform another action ;
}

How to link 2 buttons to 2 different html links in eclpse?

I have created 2 buttons and i want to link both of them to 2 different html links,but i could link only one by using this below code....
package com.kk24.adding two buttons;
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.content.Intent;
import android.net.Uri;
public class Main extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button btn = (Button) findViewById(R.id.button1);
btn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent myWebLink = new Intent(android.content.Intent.ACTION_VIEW);
myWebLink.setData(Uri.parse("http://........."));
startActivity(myWebLink);
}
});
}
Now i want to link button 2 to another link how do we link ????
Give me step by step details if there is something to import or creating a class or so.....
Thanks in advance.

Try this code:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button btn = (Button) findViewById(R.id.button1);
btn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent myWebLink = new Intent(android.content.Intent.ACTION_VIEW);
myWebLink.setData(Uri.parse("http://link1."));
startActivity(myWebLink);
}
});
Button btn2 = (Button) findViewById(R.id.button2);
btn2.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent myWebLink2 = new Intent(android.content.Intent.ACTION_VIEW);
myWebLink2.setData(Uri.parse("http://link2."));
startActivity(myWebLink2);
}
});

create new String stringUris then make the String stringUris equals the first link in the first button and in the second button equals the second link then start the activity
String stringUris;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button btn = (Button) findViewById(R.id.button1);
btn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
stringUris = "http://www.example1.com";
Intent Intent1 = new Intent(android.content.Intent.ACTION_VIEW);
myWebLink.setData(Uri.parse(stringUris));
startActivity(myWebLink);
}
});
Button btn2 = (Button) findViewById(R.id.button2);
btn2.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
stringUris = "http://www.example2.com";
Intent Intent2 = new Intent(android.content.Intent.ACTION_VIEW);
myWebLink2.setData(Uri.parse(stringUris));
startActivity(myWebLink2);
}
you can use a class for showing webview within the app if you want the class contact me.

On xml file in each button add two attributes android:tag with the url and android:onClick with the method name that handle the event
<Button android:id="#id/btSite1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:tag="http://site_1.com"
android:onClick="openBrowser"/>
<Button android:id="#id/btSite2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:tag="http://site_2.com"
android:onClick="openBrowser"/>
On activity declare the method openBrowser to handle the click event:
public class Main extends Activity{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
public void openBrowser(View view){
//Get url from tag
String url = (String)view.getTag();
if(url != null){
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
intent.addCategory(Intent.CATEGORY_BROWSABLE);
//pass the url to intent data
intent.setData(Uri.parse(url));
startActivity(intent);
}
}
}
Now when an button is clicked the openBrowser method is called and the browser is open.

Only one of three buttons working

Hey I am trying to get different buttons to open up different pages in a android project but only on of the buttons is opening up a new page.
I am new to programming so my terminology may not be correct but I was following a youtube tutorial and it showed how to create a button and make it open up a new page. I tried to do this for multiple buttons but I think I am making the mistake in the main activity. Sorry if I haven't provided the write information to help me solve the problem.
package test.activity.today;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class ActivityTutorialActivity extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button next = (Button) findViewById(R.id.next_button);
next.setOnClickListener(new OnClickListener(){
public void onClick (View v){
Intent myIntent = new Intent(v.getContext(), NextActivity.class);
v.getContext().startActivity(myIntent);
}
});
}
public void onCreate1(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button next = (Button) findViewById(R.id.question_button);
next.setOnClickListener(new OnClickListener(){
public void onClick (View v){
Intent myIntent = new Intent(v.getContext(), Question.class);
v.getContext().startActivity(myIntent);
}
});
}
public void onCreate2(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button next = (Button) findViewById(R.id.owner_cost);
next.setOnClickListener(new OnClickListener(){
public void onClick (View v){
Intent myIntent = new Intent(v.getContext(), Owner.class);
v.getContext().startActivity(myIntent);
}
});
}
}

you should only have one onCreate() method.. check android activity's life cycle to understand it
package test.activity.today;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class ActivityTutorialActivity extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button next = (Button) findViewById(R.id.next_button);
next.setOnClickListener(new OnClickListener(){
public void onClick (View v){
Intent myIntent = new Intent(v.getContext(), NextActivity.class);
v.getContext().startActivity(myIntent);
}
});
Button question = (Button) findViewById(R.id.question_button);
question.setOnClickListener(new OnClickListener(){
public void onClick (View v){
Intent myIntent = new Intent(v.getContext(), Question.class);
v.getContext().startActivity(myIntent);
}
});
Button ownerCost = (Button) findViewById(R.id.owner_cost);
ownerCost.setOnClickListener(new OnClickListener(){
public void onClick (View v){
Intent myIntent = new Intent(v.getContext(), Owner.class);
v.getContext().startActivity(myIntent);
}
});
}
}

You are duplicating the onCreate() method... this method is called natively by Android and, thus, none of your other methods will get called (you'd have other problems if they were). To create more than one button, you need to add new buttons to your layout and then add them to onCreate().

There is another way to implement the onClick.
In your layout you can specify the function to call onClick
<ImageButton
android:id="#+id/imageButtonNext1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:background="#color/back_color"
android:onClick="RegistraterCompanyOnClick"
android:src="#drawable/ic_next" />
Then in your activity you can filter which button by it's ID. See below.
public void RegistraterCompanyOnClick(View v){
switch(v.getId()){
case R.id.imageButtonNext1:
String cname = company.getText().toString();
if (cname.length()== 0){
message = getString(R.string.company_required);
ShowDialog(message);
}
else{
company_name = company.getText().toString();
VerifyClient(company_name);
}
break;
case R.id.imageButtonInfo1:
//message = getString(R.string.registration_info);
message = "Device ID:\n" + deviceID;
// TODO Auto-generated method stub
ShowDialog(message);
break;
case R.id.imageButtonHelp1:
message = getString(R.string.registration_contact);
// TODO Auto-generated method stub
ShowDialog(message);
break;
case R.id.imageButtonPrevious1:
Intent resultIntent = new Intent();
// TODO Auto-generated method stub
resultIntent.putExtra("company_name", company.getText().toString());
resultIntent.putExtra("company_id", companyID);
resultIntent.putExtra("location_name", location_name);
resultIntent.putExtra("location_id", locationID);
setResult(Activity.RESULT_CANCELED, resultIntent);
finish();
default:
break;
}
}

How to restore values of a activity when i move to next activity and come back again?

I want the values of edit text restored when user comes back to my first activity?
Please help me out.
Thanks in advance
this is my first activity code for getting user values in edit text
public class IntentActivity extends Activity {
EditText ed1, ed2;
float ed1_val, ed2_val;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ed1 = (EditText) findViewById(R.id.editText1);
ed2 = (EditText) findViewById(R.id.editText2);
Button next = (Button) findViewById(R.id.button1);
next.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(getApplicationContext(),
Second_activity.class);
startActivity(intent);
}
});
}
/** Called when the activity is first created. */
#Override
public void onSaveInstanceState(Bundle savedInstanceState) {
super.onSaveInstanceState(savedInstanceState);
ed1_val = Float.parseFloat(ed1.getText().toString());
ed2_val = Float.parseFloat(ed2.getText().toString());
Log.v("TAG", "inside saved instance");
savedInstanceState.putFloat("ed1", +ed1_val);
savedInstanceState.putFloat("ed2", +ed2_val);
}
#Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
Log.v("TAG", "inside on restore");
float ed_val = savedInstanceState.getFloat("ed1");
float ed2_val = savedInstanceState.getFloat("ed2");
ed1.setText("" + ed_val);
ed2.setText("" + ed2_val);
}
}
this is my second activity code
public class Second_activity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.second_xml);
Button back = (Button) findViewById(R.id.button1);
back.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(getApplicationContext(),
IntentActivity.class);
startActivity(intent);
}
});
}
}

It is not a good idea to start the first activity again on back pressed. Call finish() in the second activity. This will lead to the resume of the first activity which is what you need.
back.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
finish(); }
});
}

You don't need neither onSaveInstanceState nor onRestoreInstanceState.
Just call finish in the onClick listener for the button in the second Activity:
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class IntentActivity extends Activity {
EditText ed1, ed2;
float ed1_val, ed2_val;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ed1 = (EditText) findViewById(R.id.editText1);
ed2 = (EditText) findViewById(R.id.editText2);
Button next = (Button) findViewById(R.id.button1);
next.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(getApplicationContext(),
Second_activity.class);
startActivity(intent);
}
});
}
}
This is the second one:
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class Second_activity extends Activity {
// TODO Auto-generated method stub
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.second_xml);
Button back = (Button) findViewById(R.id.button1);
back.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
finish();
}
});
}
}
That way you are resuming the previous Activity instead of starting new one.
If you need to pass data between them you could use startActivityForResult / onActivityResult and setResult methods:
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class IntentActivity extends Activity {
private static final int GET_VALUES_REQUEST_ID = 1;
public static final String FIRST_VALUE_ID = "first_value_id";
public static final String SECOND_VALUE_ID = "second_value_id";
private static final float DEFAULT_VALUE = 0;
EditText ed1, ed2;
float ed1_val, ed2_val;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ed1 = (EditText) findViewById(R.id.editText1);
ed2 = (EditText) findViewById(R.id.editText2);
Button next = (Button) findViewById(R.id.button1);
next.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(getApplicationContext(),
Second_activity.class);
startActivityForResult(intent, GET_VALUES_REQUEST_ID);
}
});
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case GET_VALUES_REQUEST_ID: {
if (Activity.RESULT_OK == resultCode) {
ed1_val = data.getFloatExtra(FIRST_VALUE_ID, DEFAULT_VALUE);
ed2_val = data.getFloatExtra(SECOND_VALUE_ID, DEFAULT_VALUE);
setValues();
}
break;
}
}
super.onActivityResult(requestCode, resultCode, data);
}
protected void setValues() {
ed1.setText(Float.toString(ed1_val));
ed2.setText(Float.toString(ed2_val));
}
}
The second activity could be something like that:
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class Second_activity extends Activity {
// TODO Auto-generated method stub
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.second_xml);
Button back = (Button) findViewById(R.id.button1);
back.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent data = new Intent();
data.putExtra(IntentActivity.FIRST_VALUE_ID, 324f);
data.putExtra(IntentActivity.SECOND_VALUE_ID, 32234f);
setResult(Activity.RESULT_OK, data);
finish();
}
});
}
}
This is a very basic example so I just hardcoded some return values - please implement something more meaningful.
Beside that you could avoid using underscores as word separator in class names - camel case is much more accepted as name convention.

just finish the second activity don't start it via intent.
When you finish the second activity first activity will be automatically resumed,

you can go for overriding protected void onSaveInstanceState(Bundle outState) and protected void onRestoreInstanceState(Bundle savedInstanceState)
Here is an example
Remember it will work when you will not finish your previous activity.Do this in your first activity.

You are starting a new activity by pressing back button on Second Activity. The new activity instance is not the previous one that has started the Second Activity hence onRestoreInstanceState callback is not getting called.

Its easy if you do not need to send data back to the first activity. How do send back data without using an intent.

reset button in signup page is not working in android

I tried to make a signup page in android where I use a reset button that should clear all fields in the page. Please see the code below and correct it as my code is not working.
Button btnreset = (Button) findViewById(R.id.btnreset);
btnreset.setOnClickListener(new View.OnClickListener() {
public void restartActivity(Activity act){
Intent intent=new Intent();
act.finish();
intent.setClass(act, act.getClass());
act.startActivity(intent);
}
}
this is an signup page and fields are first name,last name,user id,password.when user click on reset button it clear all the fields who's filled the user.I'm give a complete source code to you please check this:
package com.boyzcorn.android.fyp;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import android.content.Intent;
public class signup extends Activity{
public void onCreate(Bundle icicle)
{
super.onCreate(icicle);
setContentView(R.layout.signup);
Button b = (Button) findViewById(R.id.btnClick2);
Button btnreset = (Button) findViewById(R.id.btnreset);
final EditText eText1 = (EditText)findViewById(R.id.firstname);
final EditText eText2 = (EditText)findViewById(R.id.lastname);
final EditText eText3 = (EditText)findViewById(R.id.userid);
final EditText eText4 = (EditText)findViewById(R.id.password);
b.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
{
if(eText1.getText().toString().equals("") ||eText2.getText().toString().equals("") || eText3.getText().toString().equals("") ||eText4.getText().toString().equals(""))
{
Toast.makeText( getApplicationContext(),"Fill Empty Fields",Toast.LENGTH_SHORT ).show();
}
else
{
Intent i = new Intent(signup.this,login.class);
startActivity(i);
}
}
}
});
}
btnreset.setOnClickListener(new View.OnClickListener() {
public void restartActivity(Activity act){
Intent intent=new Intent();
act.finish();
intent.setClass(act, act.getClass());
act.startActivity(intent);
}
}
public void onClick(View arg0) {
}
}

You've only defined the function; you're not calling it. You will need to execute restartActivity(signup.this) from the OnClickListener.
Also, your intent will likely not execute, because its parent has been finished. Perhaps rearranging the lines of code might help, but a better solution would be having the parent activity start it. Try replacing the click listener with:
btnreset.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Activity act = signup.this;
Intent intent = new Intent(act, act.getClass());
act.startActivity(intent);
act.finish();
}
}

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

Displaying Another Screen Onclick in Android - android

Related

How to start an activity in Android?

How to link 2 buttons to 2 different html links in eclpse?

Only one of three buttons working

How to restore values of a activity when i move to next activity and come back again?

reset button in signup page is not working in android

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