Develop Reference

How to make two diffrent Activities to use the same layout Android

Below code works fine, but it opens a new layout and shows the toast message. but i wanted it to show toast & popup menus on the current layout. I'm working on popup menu project, i want to show popup menu on same layout. Thanks in Advance.
MainMactivity.java
package com.example.twoact;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainActivity extends Activity {
Button b1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
b1 = (Button) findViewById(R.id.button1);
b1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent openpopactivity = new Intent(MainActivity.this,
MainActivity2.class);
startActivity(openpopactivity);
}
});
}
}
MainActivity2.java
package com.example.twoact;
import android.widget.Toast;
import android.os.Bundle;
import android.os.Handler;
public class MainActivity2 extends MainActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
new Handler().postDelayed(new Runnable() {
public void run() {
Toast.makeText(getApplicationContext(), "ya am in",
Toast.LENGTH_SHORT).show();
}
}, 1000);
}
}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.twoact.MainActivity"
tools:ignore="MergeRootFrame" >
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="142dp"
android:text="Button" />
</RelativeLayout>

You can use Popup menu and Popup window. in this you can use your custom layout so you can get your view as window in same activity.
Popup window will be good option because it is since API LEVEL 1
please refer this docs and example 1,example 2
And Popup Menu is since API LEVEL 11. so you have to manage for lower version
docs for Popup Menu and example
popup window

when i change my button to an icon i can't click on it to go to a new layout

this my xml file main
<?xml version="1.0" encoding="utf-8"?>
<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:background="#raw/christmas"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/by_kostas"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="83dp"
android:text="#string/by_kostas"
android:textSize="20sp"
android:textColor="#F2F3F4"/>
<ImageView
android:id="#+id/settings"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:onClick="nameOfMethod"
android:src="#raw/settings" />
</RelativeLayout>
and my java Main
package com.kostas.mytorch;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.ImageView;
public class Main extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
//start our layout
super.onCreate(savedInstanceState);
setContentView(R.layout.main);{
final ImageView diskView = (ImageView) findViewById(R.id.settings);
diskView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v){
//my codes
}
});
diskView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v){
// System.out.println("image clicked...");//in my logcat
startActivity(new Intent("com.kostas.standroid.settings"));
}
});
}
}
my problem is when i click in the settings icon, my program crashes instead of what i wanted to create a new layout (settings xml is just black page),can someone be kind enough to help me out

You can attach click listener to any view by two ways:
In xml, write onClick attribute of the view and pass the method
name you have implemented in the activity.
Example: android:onClick="someMethod" and in the activity code, declare a method
public void someMethod(View view)
{
// handle click here
}
In activity, use setOnClickListener() to the view.
For now, try this:
diskView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v){
// System.out.println("image clicked...");//in my logcat
startActivity(new Intent(Main.this, settings.class));
}
});
Also remove this line from xml: android:onClick="nameOfMethod"

Some time there is contextual problem. Try this.
Intent intent = new Intent(CurrentActivity.this, UpcomingActivity.class);
startActivity(intent);
Also don't forget to define class in Manifest file

try to remove
android:onClick="nameOfMethod"
from the xml layout. I believe this is the method that it's called when you click the settings button and it doesn't exist so it crashes.

dialog button not working

I have post about this before but iv had no luck. this is my code that i have at the moment. what i am looking for is. My button on my dialog to simply go back (or close) to the origanl
screen. i have been reading about the back button in android and it just go's over my head.
java.code
import my.dlog.R;
import android.app.Activity;
import android.app.Dialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.view.View.OnClickListener;
public class DlogActivity extends Activity {
/** Called when the activity is first created. */
Dialog dialog;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
dialog = new Dialog(this);
dialog.setContentView(R.layout.main2);
dialog.setTitle("This is my custom dialog box");
dialog.setCancelable(true);
Button b=(Button)findViewById(R.id.button1);
b.setOnClickListener(new OnClickListener() {
public void onBackPressed() {
Intent intent = new Intent(DlogActivity.this, DlogActivity.class);
startActivity(intent);
finish();
}
public void onClick(View v) {
dialog.show();
}
});
}
}
xml.code
<Button
android:id="#+id/btn2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:text="Button"
android:onClick="DlogActivity"/>
<ImageView
android:layout_width="236dp"
android:layout_height="220dp"
android:layout_marginRight="100dp" android:background="#drawable/carsee"/>
<RelativeLayout
android:id="#+id/relativeLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >

Your code is totally confusing to me. I suspect that you might be confused about the difference between an activity and a dialog. If all you are trying to do is show a dialog on top of your activity, and then return to that activity when the dialog is dismissed, you need dialog.dismiss(). Read this
If you are trying to achieve something else, please explain.

You aren't connecting your button correctly. You look for id of button1 in Java
Button b=(Button)findViewById(R.id.button1);
but in the xml, you assign the button an id of btn2
<Button
android:id="#+id/btn2"
android:layout_width="wrap_content"
.
android:onClick="DlogActivity"/>
Make sure these id's match.

can't go back button

I have a problem with my Android app. I have three Activities that all connect with one another with a Image button.
My problem is I can't go back on any of the pages, just forwards. I have been reading about the back button and how to keep its state and not kill (End) it, so the user can click back if needed too.
I am new to Android and I know there's a lot to learn. So thank you for your help.
Java code for first Activity:
package my.hope;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.content.Intent;
public class NewhopeActivity extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ImageView myImage = (ImageView) findViewById(R.id.imagebutton1);
myImage.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(NewhopeActivity.this, Act2.class);
startActivity(intent);
}
});
}
}
XML code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" android:background="#drawable/mint">
<ImageButton
android:id="#+id/imagebutton1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="250dp"
android:background="#drawable/ic_launcher"
android:onClick="Act2"
android:src="#drawable/ic_launcher" />
</LinearLayout>

What happens when you click the back button on your device? Unless specified, it kills the current activity and brings you back to the previous one.
However, if you wish to specify exactly what would clicking the back button do, you can override the onBackPressed() method:
#Override
public void onBackPressed() {
Intent intent = new Intent(CurrentActivity.this, NextActivity.class);
startActivity(intent);
finish();
}

dialog code wrong somewere?

Can someone help with this code. what am looking for is for the button on my dialog to go back a pagewhen the users press the button.so i dont have to press the phone back button thank you.
java file
import android.app.Activity;
import android.app.Dialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.view.View.OnClickListener;
public class DlogActivity extends Activity {
/** Called when the activity is first created. */
Dialog dialog;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
dialog = new Dialog(this);
dialog.setContentView(R.layout.main2);
dialog.setTitle("This is my custom dialog box");
dialog.setCancelable(true);
Button b=(Button)findViewById(R.id.button1);
#SuppressWarnings("unused")Button button01 =(Button)findViewById(R.id.btn2);
Intent intent = new Intent(DlogActivity.this, DlogActivity.class);
startActivity(intent);
finish();
b.setOnClickListener(new OnClickListener() {
public void onBackPressed() {
dialog.cancel();
// Simply Dismiss the dialog to make it close and return to back..
/*What you are using is not a valid construct */
}
public void onClick(View v) {
dialog.show();
}
});
}
}
xml.code
<Button
android:id="#+id/btn2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:text="Button" />
<ImageView
android:layout_width="236dp"
android:layout_height="220dp"
android:layout_marginRight="100dp" android:background="#drawable/carsee"/>
<RelativeLayout
android:id="#+id/relativeLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
</RelativeLayout>
</LinearLayout>

seems like the problem is at below code,
dialog.setContentView(R.layout.main2);
you cannot give layout like this, instead you need to inflate layout to your dialog.