flashlight application for android, code
Description:
This is android application developed in android studio using java and XML programming language.Here is ImageView which is used to get device camera permission after on click and a button which is used to ON/OFF the flash of device.
- IDE used => Android studio 3.1.0
- photo used:
drawable
(i)photo
name =btn_switch_off.PNG
(ii)photo
name =btn_switch_on.PNG
(iii)photo
name =icon.PNG
(iv)photo
name =wall.PNG
- AndroidManifest.xml :
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.dell.flashlight">
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<application android:allowBackup="true"
android:icon="@drawable/icon"
android:label="@string/app_name"
android:roundIcon="@drawable/icon"
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>
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.dell.flashlight">
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<application android:allowBackup="true"
android:icon="@drawable/icon"
android:label="@string/app_name"
android:roundIcon="@drawable/icon"
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>
Java class
class 1 :MainActivity.class :
package com.example.dell.flashlight;
import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.hardware.camera2.CameraAccessException;
import android.hardware.camera2.CameraManager;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
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 Button buttonEnable;
private ImageView imageFlashlight;
private static final int CAMERA_REQUEST = 50;
private boolean flashLightStatus = false;
@Override protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
buttonEnable =(Button)findViewById(R.id.buttonEnable);
imageFlashlight =(ImageView)findViewById(R.id.imageFlashlight);
final boolean hasCameraFlash = getPackageManager().
hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);
boolean isEnabled = ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
== PackageManager.PERMISSION_GRANTED;
buttonEnable.setEnabled(!isEnabled);
imageFlashlight.setEnabled(isEnabled);
buttonEnable.setOnClickListener(new View.OnClickListener() {
@Override public void onClick(View view) {
ActivityCompat.requestPermissions(MainActivity.this, new String[] {Manifest.permission.CAMERA}, CAMERA_REQUEST);
}
});
imageFlashlight.setOnClickListener(new View.OnClickListener() {
@Override public void onClick(View view) {
if (hasCameraFlash) {
if (flashLightStatus)
flashLightOff();
else flashLightOn();
} else {
Toast.makeText(MainActivity.this, "No flash available on your device",
Toast.LENGTH_SHORT).show();
}
}
});
}
private void flashLightOn() {
CameraManager cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
try {
String cameraId = cameraManager.getCameraIdList()[0];
cameraManager.setTorchMode(cameraId, true);
flashLightStatus = true;
imageFlashlight.setImageResource(R.drawable.btn_switch_on);
} catch (CameraAccessException e) {
}
}
private void flashLightOff() {
CameraManager cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
try {
String cameraId = cameraManager.getCameraIdList()[0];
cameraManager.setTorchMode(cameraId, false);
flashLightStatus = false;
imageFlashlight.setImageResource(R.drawable.btn_switch_off);
} catch (CameraAccessException e) {
}
}
@Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
switch(requestCode) {
case CAMERA_REQUEST :
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
buttonEnable.setEnabled(false);
buttonEnable.setText("Camera Enabled");
imageFlashlight.setEnabled(true);
} else {
Toast.makeText(MainActivity.this, "Permission Denied for the Camera", Toast.LENGTH_SHORT).show();
}
break;
}
}
}
layout
layout 1:activity_main.xml
<?xml version="1.0" encoding="utf-8"?><RelativeLayout 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"android:background="@drawable/wall"tools:context=".MainActivity"> <ImageView android:id="@+id/imageFlashlight"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerInParent="true"android:src="@drawable/btn_switch_off"android:contentDescription="@string/todo" /> <Button android:id="@+id/buttonEnable"android:layout_width="200dp"android:layout_height="wrap_content"android:layout_centerHorizontal="true"android:textSize="20sp"android:text="@string/enable_camera"android:textStyle="bold|italic"android:background="#000000"android:textColor="#ffffff"android:layout_above="@id/imageFlashlight"android:layout_marginBottom="40dp"/> </RelativeLayout>
values
1.color.xml
<?xml version="1.0" encoding="utf-8"?><resources>
<color name="colorPrimary">#3F51B5</color>
<color name="colorPrimaryDark">#303F9F</color>
<color name="colorAccent">#FF4081</color>
</resources>
2.strings.xml<resources> <string name="app_name">flashlight</string> <string name="enable_camera">Enable Camera</string> <string name="todo">TODO</string> </resources>
3.styles.xml
dependencies
implementation fileTree(dir: 'libs', include: ['*.jar']) implementation 'com.android.support:appcompat-v7:28.0.0-alpha1'implementation 'com.android.support.constraint:constraint-layout:1.1.3'testImplementation 'junit:junit:4.12'androidTestImplementation 'com.android.support.test:runner:1.0.2'androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
