setup the camera

app/src/main/AndroidManifest.xml

@@ -1,6 +1,17 @@
 <?xml version="1.0" encoding="utf-8"?>
-<manifest package="flashlight.simplemobiletools.com"
-          xmlns:android="http://schemas.android.com/apk/res/android">
+<manifest
+    package="flashlight.simplemobiletools.com"
+    xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <uses-permission android:name="android.permission.CAMERA"/>
+    <uses-feature
+        android:name="android.hardware.camera"
+        android:required="false"/>
+
+    <uses-permission android:name="android.permission.FLASHLIGHT"/>
+    <uses-feature
+        android:name="android.hardware.camera.flash"
+        android:required="true"/>
 
     <application
         android:allowBackup="true"
@@ -16,5 +27,4 @@
             </intent-filter>
         </activity>
     </application>
-
 </manifest>

app/src/main/java/flashlight/simplemobiletools/com/MainActivity.java

@@ -1,13 +1,57 @@
 package flashlight.simplemobiletools.com;
 
-import android.support.v7.app.AppCompatActivity;
+import android.hardware.Camera;
 import android.os.Bundle;
+import android.support.v7.app.AppCompatActivity;
 
 public class MainActivity extends AppCompatActivity {
+    private Camera camera;
+    private Camera.Parameters params;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
+        setupCamera();
+    }
+
+    private void setupCamera() {
+        if (camera == null) {
+            camera = Camera.open();
+            params = camera.getParameters();
+            params.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
+            camera.setParameters(params);
+        }
+    }
+
+    private void releaseCamera() {
+        if (camera != null) {
+            camera.release();
+            camera = null;
+        }
+    }
+
+    @Override
+    protected void onStart() {
+        super.onStart();
+        setupCamera();
+    }
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+        setupCamera();
+    }
+
+    @Override
+    protected void onPause() {
+        super.onPause();
+        releaseCamera();
+    }
+
+    @Override
+    protected void onStop() {
+        super.onStop();
+        releaseCamera();
     }
 }

app/src/main/res/layout/activity_main.xml

@@ -10,8 +10,4 @@
     android:paddingTop="@dimen/activity_vertical_margin"
     tools:context="flashlight.simplemobiletools.com.MainActivity">
 
-    <TextView
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="Hello World!"/>
 </RelativeLayout>