activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<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"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="2"
android:layout_margin="10dp">
<Button
android:id="@+id/btn_front"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Front Camera"
android:layout_marginEnd="10dp" />
<Button
android:id="@+id/btn_back"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Back Camera" />
</LinearLayout>
<ImageView
android:id="@+id/iv_image"
android:layout_width="250dp"
android:layout_height="250dp"
android:layout_centerInParent="true"/>
</RelativeLayout>
MainActivity.java
package com.surabhiglobal.example;
import android.Manifest;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.SurfaceTexture;
import android.hardware.Camera;
import android.net.Uri;
import android.os.Bundle;
import android.provider.Settings;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import androidx.appcompat.app.AppCompatActivity;
import com.karumi.dexter.Dexter;
import com.karumi.dexter.MultiplePermissionsReport;
import com.karumi.dexter.PermissionToken;
import com.karumi.dexter.listener.PermissionRequest;
import com.karumi.dexter.listener.multi.MultiplePermissionsListener;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private Button btn_front, btn_back;
private String TAG = MainActivity.class.getName();
private ImageView iv_image;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn_front = findViewById(R.id.btn_front);
btn_back = findViewById(R.id.btn_back);
iv_image = findViewById(R.id.iv_image);
btn_front.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
requestAppPermissions("1");
}
});
btn_back.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
requestAppPermissions("0");
}
});
}
private void requestAppPermissions(String type) {
Dexter.withActivity(MainActivity.this)
.withPermissions(
Manifest.permission.CAMERA)
.withListener(new MultiplePermissionsListener() {
@Override
public void onPermissionsChecked(MultiplePermissionsReport report) {
if (report.areAllPermissionsGranted()) {
if (type.equals("0")) {
CaptureBackPhoto();
} else {
CaptureFrontPhoto();
}
}
// check for permanent denial of any permission
if (report.isAnyPermissionPermanentlyDenied()) {
// permission is denied permenantly, navigate user to app settings
showSettingsDialog();
}
}
@Override
public void onPermissionRationaleShouldBeShown(List<PermissionRequest> permissions, PermissionToken token) {
token.continuePermissionRequest();
}
})
.onSameThread()
.check();
}
private void showSettingsDialog() {
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("Need Permissions");
builder.setMessage("This app needs permission to use this feature. You can grant them in app settings.");
builder.setPositiveButton("GOTO SETTINGS", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
openSettings();
}
});
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
builder.show();
}
private void openSettings() {
Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
Uri uri = Uri.fromParts("package", getPackageName(), null);
intent.setData(uri);
startActivityForResult(intent, 101);
}
private void CaptureFrontPhoto() {
Log.d(TAG, "Preparing to take photo");
Camera camera = null;
Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
int frontCamera = 1;
//int backCamera=0;
Camera.getCameraInfo(frontCamera, cameraInfo);
try {
camera = Camera.open(frontCamera);
camera.enableShutterSound(false);
} catch (RuntimeException e) {
Log.d(TAG, "Camera not available: " + 1);
camera = null;
//e.printStackTrace();
}
try {
if (null == camera) {
Log.d(TAG, "Could not get camera instance");
} else {
Log.d(TAG, "Got the camera, creating the dummy surface texture");
try {
camera.setPreviewTexture(new SurfaceTexture(0));
camera.startPreview();
} catch (Exception e) {
Log.d(TAG, "Could not set the surface preview texture");
e.printStackTrace();
}
camera.takePicture(null, null, new Camera.PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
try {
Bitmap bmp = BitmapFactory.decodeByteArray(data, 0, data.length);
iv_image.setImageBitmap(bmp);
} catch (Exception e) {
System.out.println(e.getMessage());
}
camera.release();
}
});
}
} catch (Exception e) {
camera.release();
}
}
private void CaptureBackPhoto() {
Log.d(TAG, "Preparing to take photo");
Camera camera = null;
try {
camera = Camera.open();
camera.enableShutterSound(false);
} catch (RuntimeException e) {
Log.d(TAG, "Camera not available: " + 1);
camera = null;
//e.printStackTrace();
}
try {
if (null == camera) {
Log.d(TAG, "Could not get camera instance");
} else {
Log.d(TAG, "Got the camera, creating the dummy surface texture");
try {
camera.setPreviewTexture(new SurfaceTexture(0));
camera.startPreview();
} catch (Exception e) {
Log.d(TAG, "Could not set the surface preview texture");
e.printStackTrace();
}
camera.takePicture(null, null, new Camera.PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
try {
Bitmap bmp = BitmapFactory.decodeByteArray(data, 0, data.length);
iv_image.setImageBitmap(bmp);
} catch (Exception e) {
System.out.println(e.getMessage());
}
camera.release();
}
});
}
} catch (Exception e) {
camera.release();
}
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.surabhiglobal.example">
<uses-permission android:name="android.permission.CAMERA"/>
<uses-feature android:name="android.hardware.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/Theme.ForegroundServiceExample">
<activity
android:name=".MainActivity"
android:configChanges="orientation|screenSize">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
build.gradle (app level file)
plugins {
id 'com.android.application'
}
android {
compileSdkVersion 30
buildToolsVersion "30.0.3"
defaultConfig {
applicationId "com.surabhiglobal.example"
minSdkVersion 17
targetSdkVersion 30
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
}
dependencies {
implementation 'androidx.appcompat:appcompat:1.2.0'
implementation 'com.google.android.material:material:1.3.0'
implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
testImplementation 'junit:junit:4.13.2'
androidTestImplementation 'androidx.test.ext:junit:1.1.2'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
//add this dependency
implementation 'com.karumi:dexter:4.2.0'
}
