<?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
<resources>
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
</style>
</resources>
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'
