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Capture image without surface view as background service in android

Capture image without user knowledge in android/Capture image as background service in android/Take photo without preview in android/ Camera without preview in android  package com.example.picture; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import android.app.Service; import android.content.Context; import android.content.Intent; import android.hardware.Camera; import android.hardware.Camera.Parameters; import android.media.AudioManager; import android.os.IBinder; import android.util.Log; import android.view.SurfaceHolder; import android.view.SurfaceView; public class CameraService extends Service {       //Camera variables       //a surface holder       private SurfaceHolder sHolder ;        //a variable to control the camera       private Camera mCamera ;       //the camera parameters       private Parameters parameters ;       /** Called when the activity is first created. */     @Override     p
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Custom Spinner in Android

Custom Spinner in Android/Spinner using custom adapter/spinner with icon and text  In this tutorial, i'll show you to customizing spinner in different methods.  To change the normal display of spinner view, add background image using the code " android:background="@drawable/myspinner_background" in the xml. You can also make it customizable by setting up an xml file in drawable folder Custom display with icon in the spinner   main.xml <? xml version = "1.0" encoding = "utf-8" ?> < LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android"     android:orientation = "vertical"     android:layout_width = "fill_parent"     android:layout_height = "fill_parent"     >     < Spinner     android:drawSelectorOnTop = "true"     android:id = "@+id/spinner1"     android:layout_width = "match_parent"     android:layout_height = "wrap_content&
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Coroutine- A complete tutorial

 What are coroutines? To know about coroutine, first you need to know about asynchronous programming, thread and multithreading concept. What is a thread? Thread describes in which context the function or sequence of instructions should be executed. So, every block of code or functions runs in a thread, right? Also, you can load multiple threads to perform different block of codes  How to start a thread? Thread thread = new Thread(){     public void run(){       System.out.println("This is a thread");     }   }     thread.start(); So when coming to android, before learning about coroutines we need to discuss some scenarios. Normally how an app works when user launch an application. When user launchers the application, a main thread is created. This thread is intended to do small operations like button clicks, UI interaction , small mathematical operations. We cant perform long running operation like file download, database queries, network operations and image
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