MainActivity.Java
package com.example.duniyarhausaflashlighttutorial;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.hardware.Camera;
import android.hardware.camera2.CameraManager;
import android.os.Build;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;
public class MainActivity extends Activity implements View.OnClickListener {
private ImageView powerImageView;
private CameraManager camManager;
private Camera cam;
private boolean lightIsOn = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
powerImageView = (ImageView) findViewById(R.id.iv_poweronoff);
powerImageView.setOnClickListener(this);
}
private void flashLightOn() {
// >= android 6.0
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (camManager == null) {
camManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
}
try {
// Usually back camera is at 0 position.
String cameraId = camManager.getCameraIdList()[0];
camManager.setTorchMode(cameraId, true);
} catch (Exception e) {
showError(e);
}
return;
}
try {
if (getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH)) {
cam = Camera.open();
Camera.Parameters p = cam.getParameters();
p.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
cam.setParameters(p);
cam.startPreview();
}
} catch (Exception e) {
showError(e);
}
}
private void flashLightOff() {
// >= android 6.0
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
try {
String cameraId = camManager.getCameraIdList()[0];
camManager.setTorchMode(cameraId, false);
} catch (Exception e) {
showError(e);
}
return;
}
try {
if (getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH)) {
cam.stopPreview();
cam.release();
cam = null;
}
} catch (Exception e) {
showError(e);
}
}
private void showError(Exception e) {
String message = "Error: " + e.getMessage();
Toast.makeText(this, message, Toast.LENGTH_SHORT).show();
}
@Override
public void onClick(View view) {
int id = view.getId();
if (id == R.id.iv_poweronoff) {
if (lightIsOn) {
flashLightOff();
powerImageView.setImageResource(R.drawable.poweroff);
} else {
flashLightOn();
powerImageView.setImageResource(R.drawable.poweron);
}
lightIsOn = !lightIsOn;
}
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center">
<ImageView
android:id="@+id/iv_poweronoff"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/poweroff" />
</LinearLayout>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.duniyarhausaflashlighttutorial">
<uses-sdk
android:minSdkVersion="12"
android:targetSdkVersion="27" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.FLASHLIGHT" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
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>
