Android Screen Dimension

How to get the Screen Dimension in Android Application

Hi, This is the way to easily get the screen dimensions of currently running android device.

1.activity_main.xml

<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=".MainActivity" >

    <TextView

        android:id="@+id/dimen"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="screen dimensions" />

    <TextView

        android:id="@+id/res"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="@string/hello_world" 

        android:layout_below="@+id/dimen"/>

</RelativeLayout>

2.MainActivity.java

package com.sri.screendimension;

import android.os.Bundle;

import android.view.Display;

import android.widget.TextView;

import android.annotation.SuppressLint;

import android.app.Activity;

import android.graphics.Point;

public class MainActivity extends Activity {

TextView tv;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

Display disp = getWindowManager().getDefaultDisplay();

Point size = new Point();

disp.getSize(size);

int width = size.x;

int height = size.y;

tv = (TextView) findViewById(R.id.res);

tv.setText(width + "<----->" + height);

}

}

3.Run the Application.

Multiple Button Click Listener

Multiple Button Listener

Now we'll learn how to manage Multiple Button click Event Listener.
As you have learn the single button click event in previous tutorial.
Now we'll Move to the Multiple Buttons Tutorial.

1.activity_main.xml

<LinearLayout 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=".MainActivity" 
    android:orientation="vertical">

    <Button
        android:id="@+id/btn1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="test1" />
    <Button
        android:id="@+id/btn2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="test2" />
    <Button
        android:id="@+id/btn3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="test3" />
    <Button
        android:id="@+id/btn4"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="test4" />


</LinearLayout>


2.MainActivity.java

package com.sri.buttontest;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener{
Button btn1,btn2,btn3,btn4;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn1 = (Button) findViewById(R.id.btn1);
btn2 = (Button) findViewById(R.id.btn2);
btn3 = (Button) findViewById(R.id.btn3);
btn4 = (Button) findViewById(R.id.btn4);
btn1.setOnClickListener(this);
btn2.setOnClickListener(this);
btn3.setOnClickListener(this);
btn4.setOnClickListener(this);
}

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.btn1:
Toast.makeText(getApplicationContext(), "test1 is clicked", Toast.LENGTH_LONG).show();
break;
case R.id.btn2:
Toast.makeText(getApplicationContext(), "test2 is clicked", Toast.LENGTH_LONG).show();
break;
case R.id.btn3:
Toast.makeText(getApplicationContext(), "test3 is clicked", Toast.LENGTH_LONG).show();
break;
case R.id.btn4:
Toast.makeText(getApplicationContext(), "test4 is clicked", Toast.LENGTH_LONG).show();
break;
default:
break;
}
}

}

3. That's all.Run the Project Now.

Comments and doubts are encouraged.

Thank you.

Simple Button Listener

Button Event Listener

New for Android, then go step by step.

First we will learn the button click event.

First write the xml file in new project.

1.activity_main.xml

<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=".MainActivity" >

    <Button

        android:id="@+id/btn1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_centerHorizontal="true"

        android:layout_centerVertical="true"

        android:text="test" />

</RelativeLayout>

MainActivity.java

package com.sri.buttontest;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.Toast;

public class MainActivity extends Activity {

Button btn;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

btn = (Button) findViewById(R.id.btn1);

btn.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

Toast.makeText(getApplicationContext(), "Test is clicked",

Toast.LENGTH_LONG).show();

}

});

}

}

3.Now this is how the button listener works.

Thank you.