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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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Open front camera in android program

How to access front camera in android/get number of cameras in android/Program to open front camera in android Using the code explained below, we can easily find out number of cameras in your android device. Camera.CameraInfo cameraInfo = new Camera.CameraInfo();         Log. d ( "No of cameras" ,Camera. getNumberOfCameras ()+ "" );         for ( int camNo = 0; camNo < Camera. getNumberOfCameras (); camNo++) {             CameraInfo camInfo = new CameraInfo();             Camera. getCameraInfo (camNo, camInfo);                         if (camInfo. facing ==(Camera.CameraInfo. CAMERA_FACING_FRONT )) {                 mCamera = Camera. open (camNo);             }         }         if ( mCamera == null ) {            // no front-facing camera, use the first back-facing camera instead.            // you may instead wish to inform the user of an error here...               mCamera = Camera. open ();         } A sample program that take photo using front camer
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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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