Android Studio : How to detect camera, activate and capture example


Tags : android-studio detect-camera capture-image-or-video java

Let's have some fun with Android by learning how to detect the camera, activate the camera and capture with the camera. This app has one button. When pressed, first it will detect if the device has a camera or not. If the device has a camera, it will activate the camera and launch the default Android camera app to capture from the camera.

NOTE: In our example, the camera view is simulated by the Android Virtual Device. You can transfer the APK file over to a real Android device to see how this application works with a real camera.

Here you go!

Fill the XML layout design in the main_activity_camera.xml:


 <?xml version="1.0" encoding="utf-8"?>
 <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context="com.example.sweetlogic.camera.MainCamera"
 tools:layout_editor_absoluteX="0dp"
 tools:layout_editor_absoluteY="81dp">

 <Button
 android:id="@+id/buttonActivateCamera"
 android:layout_width="300dp"
 android:layout_height="50dp"
 android:text="Activate Camera"
 app:layout_constraintBottom_toBottomOf="parent"
 app:layout_constraintLeft_toLeftOf="parent"
 app:layout_constraintRight_toRightOf="parent"
 app:layout_constraintTop_toTopOf="parent"
 tools:layout_editor_absoluteX="42dp"
 tools:layout_editor_absoluteY="230dp" />

 </android.support.constraint.ConstraintLayout>

main camera app design XML

Next step is to fill in the Java codes at MainCamera.java


 package com.example.sweetlogic.camera;

 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.Button;
 import android.content.Context;
 import android.content.pm.PackageManager;
 import android.widget.Toast;
 import android.util.Log;
 import android.provider.MediaStore;
 import android.content.Intent;


 public class MainCamera extends AppCompatActivity {

 // global variable
 boolean cameraAvailable = false;
 static final int REQUEST_IMAGE_CAPTURE = 1;
 Context context = this;


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

 // listen to activate camera button
 addListenerOnActiveCameraButton();

 }


 private boolean checkCameraHardware(Context context) {
 if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
 Toast.makeText(MainCamera.this, "this device has a camera", Toast.LENGTH_LONG).show();
 return true;
 } else {
 Toast.makeText(MainCamera.this, "no camera on this device", Toast.LENGTH_LONG).show();
 return false;
 }
 }


 public void addListenerOnActiveCameraButton() {
 Button button = (Button) findViewById(R.id.buttonActivateCamera);

 button.setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View view) {
 cameraAvailable = checkCameraHardware(context);
 if (cameraAvailable) {

 // ok, we will use Intent to take photo
 Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
 if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
 startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
 }
 Log.i("camera", "yes");
 } else {
 Log.i("camera", "no");
 }

 }

 });
 }


 }

Hit the Run button and press the button on your application to activate the camera.

before pressing the button after launching the default camera app

To see your application log messages, on the lower-left corner of the Android Studio, press the Android Monitor tab and click on the logcat tab.

view log messages generated by Android application.

References:

https://www.socketloop.com/tutorials/android-studio-image-button-and-button-example

https://developer.android.com/guide/topics/media/camera.html#detect-camera

https://developer.android.com/training/camera/photobasics.html

  See also : Android Studio : AlertDialog to get user attention example



Tags : android-studio detect-camera capture-image-or-video java

By Adam Ng

IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.


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