Android Transparent Background | Set Opacity in Android | Make android application with transparent background

Hi Friends,

I am again here with very small and important demo in android. How to make your activity transparent and how to set opacity in background.  I am sharing code here step by step-

1)      In your manifest make that activity theme to Translucent-

          <activity

            android:name="com.androidhub4you.transparent.background.MainActivity"

            android:theme="@android:style/Theme.Translucent"

            android:label="@string/app_name" >

2)      Now your page will be 100% transparent, so if you need some background color then set opacity like-

<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="#80000000"

    tools:context=".MainActivity" >

Concentrate on this line- android:background="#80000000"

Here 80 stand for alpha color from 0-255 and 000000 for black color. So just add 2 first digit of alpha with your color code. Below is the normal chart for opacity percentage-

100% — FF

90% — E6

80% — CC

70% — B3

60% — 99

50% — 80

40% — 66

30% — 4D

20% — 33

10% — 1A

0% — 00

And below is the whole code-

   
1)    MainActivity.java

package com.androidhub4you.transparent.background;

import android.app.Activity;

import android.os.Bundle;

public class MainActivity extends Activity {

       @Override

       protected void onCreate(Bundle savedInstanceState) {

              super.onCreate(savedInstanceState);

              setContentView(R.layout.activity_main);

       }

      

}

    2)    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:background="#8C000000"

    tools:context=".MainActivity" >

    <TextView

        android:id="@+id/textView1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_centerHorizontal="true"

        android:layout_centerVertical="true"

        android:text="www.androidhub4you.com\n(From: Manish Srivastava)"

        android:textColor="#FFFFFF"

        android:textSize="25sp" />

    <ImageView

        android:id="@+id/imageView1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_above="@+id/textView1"

        android:layout_alignLeft="@+id/textView1"

        android:src="@drawable/logo" />

</RelativeLayout>

     3)    AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.androidhub4you.transparent.background"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="18" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/logo"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name="com.androidhub4you.transparent.background.MainActivity"

            android:theme="@android:style/Theme.Translucent"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

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Thank You!