How to click camera programmatically in android?

This example demonstrates how do I click camera programmatically in android.
Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.
Step 2 − Add the following code to res/layout/activity_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="match_parent"
   android:gravity="center_horizontal"
   android:layout_height="match_parent">
   <TextView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Click the below button to take photo from camera"/>
   <ImageView
      android:id="@+id/imageView"
      android:scaleType="centerCrop"
      android:layout_width="300dp"
      android:layout_height="400dp"
      android:src="@drawable/ic_image_black"
      android:layout_marginTop="16dp"/>
   <Button
      android:id="@+id/btnCaptureImage"
      android:text="Capture Image"
      android:layout_width="match_parent"
      android:layout_height="wrap_content" />
</LinearLayout>
Step 3 − Add the following code to src/MainActivity.java
import android.Manifest;
import android.content.ContentValues;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Build;
import android.provider.MediaStore;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
   private static final int PERMISSION_CODE = 1000;
   Button mCaptureBtn;
   ImageView mImageView;
   Uri imageUri;
   private int IMAGE_CAPTURE_CODE = 1001;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      mImageView = findViewById(R.id.imageView);
      mCaptureBtn = findViewById(R.id.btnCaptureImage);
      mCaptureBtn.setOnClickListener(new
      View.OnClickListener() {
         @Override
         public void onClick(View v) {
            if (Build.VERSION.SDK_INT>=Build.VERSION_CODES.M){
               if (checkSelfPermission(Manifest.permission.CAMERA)==PackageManager.PERMISSION_GRANTED(Manifest.permission.CAMERA).PERMISSION_DENIED){
                  String[] permission = {Manifest.permission.CAMERA,Manifest.permission.WRITE_EXTERNAL_STORAGE};
                  requestPermissions(permission,PERMISSION_CODE);
               } else{
                  openCamera();
               }
            }
         }
      });
   }
   private void openCamera() {
      ContentValues values = new ContentValues();
      values.put(MediaStore.Images.Media.TITLE, "New Picture");
      values.put(MediaStore.Images.Media.DESCRIPTION, "From the Camera");
      imageUri = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
      Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
      cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
      startActivityForResult(cameraIntent, IMAGE_CAPTURE_CODE);
   }
   public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
      switch (requestCode){
         case PERMISSION_CODE:{
            if (grantResults.length > 0 && grantResults[0]==PackageManager.PERMISSION_GRANTED){
               openCamera();
            } else {
               Toast.makeText(this, "Permissiondenied...", Toast.LENGTH_SHORT).show();
            }
         }
      }
   }
   @Override
   protected void onActivityResult(int requestCode, intresultCode, Intent data) {
      if (resultCode == RESULT_OK){
         mImageView.setImageURI(imageUri);
      }
   }
}
Step 4 − Add the following code to androidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.sample">
   <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
   <uses-permission android:name="android.permission.CAMERA"/>
   <application
      android:allowBackup="true"
      android:icon="@mipmap/ic_launcher"
      android:label="@string/app_name"
      android:roundIcon="@mipmap/ic_launcher_round"
      android:supportsRtl="true"
      android:theme="@style/AppTheme">
      <activity android:name=".MainActivity">
         <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
      </activity>
   </application>
</manifest>
Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click Run  icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −
Click here to download the project code.