Saturday, 23 May 2015

set background programmatically of layout using android drawable resource

Posted by devraj chavda on 04:29 2 comments
In this android example,we learn basic of  how to set background of layout using drawable resource.
here we set background of layout which is display as Image button.

CREATE NEW ANDROID PROJECT

Step 1: write code into activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#17577e"
    android:orientation="vertical"
    android:id="@+id/demo" >


    <ImageButton
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="mess"
        android:text="First Image "
        android:src="@drawable/a"
        android:textSize="10sp" />

    <ImageButton
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="mess"
        android:text="Second Image"
        android:src="@drawable/b"
        android:textSize="10sp" />


</LinearLayout>

Step 2: write code into your MainActivity.java

 package dev.androidapplink.imagechange;

import android.R.layout;
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.LinearLayout;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}

// This function will call when we click on any button
       // mess method is declared in XML file

public void mess(View v) {
// initialize image view object
LinearLayout ly = (LinearLayout) findViewById(R.id.demo);

// get clicked button id from view object

 switch (v.getId()) {
case R.id.button1:
// if button1 is clicked than set image a
ly.setBackgroundResource(R.drawable.a);
break;
case R.id.button2:
// if button2 is clicked than set image b
ly.setBackgroundResource(R.drawable.b);
break;
}
}

// private layout findViewById(Class<dev.androidapplink.imagechange.R.layout> class1) {
// TODO Auto-generated method stub
//     return null;
// }

}

NOTE: Put two image with named is (1) a.jpg and (2) b.jpg into ...rec/drawable-hdpi.

NOTE: No needed special permission on AndroidManifest.xml

 Step 3: Now Run Your Project:



Download project:

2 comments :

  1. Richard C. Lambert24 June 2017 at 23:35

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