Updated AR main activity template

Author: codeanticode

mode/templates/ARActivity.java.tmpl

@@ -1,16 +1,27 @@
 package @@package_name@@;
 
+import android.Manifest;
+import android.content.pm.PackageManager;
+import android.net.Uri;
 import android.os.Bundle;
 import android.content.Intent;
+import android.provider.Settings;
+import android.support.v4.app.ActivityCompat;
+import android.support.v4.content.ContextCompat;
 import android.view.ViewGroup;
 import android.widget.FrameLayout;
 import android.support.v7.app.AppCompatActivity;
+import android.widget.Toast;
 
 import processing.android.PFragment;
 import processing.android.CompatUtils;
 import processing.core.PApplet;
 
 public class MainActivity extends AppCompatActivity {
+  private static final int CAMERA_PERMISSION_CODE = 0;
+  private static final String CAMERA_PERMISSION = Manifest.permission.CAMERA;
+  private static final String CAMERA_PERMISSION_MESSAGE = "Camera permission is needed to use AR";
+  
   private PApplet sketch;
 
   @Override
@@ -28,18 +39,63 @@ public class MainActivity extends AppCompatActivity {
   }
 
   @Override
-  public void onRequestPermissionsResult(int requestCode,
-                                         String permissions[],
-                                         int[] grantResults) {
+  protected void onResume() {
+    super.onResume();
+    if (!hasCameraPermission()) requestCameraPermission();
+  }
+
+  @Override
+  public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
+    if (!hasCameraPermission()) {
+      Toast.makeText(this, CAMERA_PERMISSION_MESSAGE, Toast.LENGTH_LONG).show();
+      if (!shouldShowRequestPermissionRationale()) {
+        launchPermissionSettings();
+      }
+      finish();
+    }  
     if (sketch != null) {
       sketch.onRequestPermissionsResult(requestCode, permissions, grantResults);
     }
-  }
-
+  }  
+  
   @Override
   public void onNewIntent(Intent intent) {
     if (sketch != null) {
       sketch.onNewIntent(intent);
+    }  
+  }
+  
+  @Override
+  public void onActivityResult(int requestCode, int resultCode, Intent data) {
+    if (sketch != null) {
+      sketch.onActivityResult(requestCode, resultCode, data);
     }
+  }  
+  
+  @Override
+  public void onBackPressed() {
+    if (sketch != null) {
+      sketch.onBackPressed();
+    }
+  }
+  
+  private boolean hasCameraPermission() {
+    int res = ContextCompat.checkSelfPermission(this, CAMERA_PERMISSION);
+    return res == PackageManager.PERMISSION_GRANTED;
+  }
+
+  private void requestCameraPermission() {
+    ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, CAMERA_PERMISSION_CODE);
+  }
+
+  private boolean shouldShowRequestPermissionRationale() {
+    return ActivityCompat.shouldShowRequestPermissionRationale(this, CAMERA_PERMISSION);
   }
+
+  private void launchPermissionSettings() {
+    Intent intent = new Intent();
+    intent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
+    intent.setData(Uri.fromParts("package", this.getPackageName(), null));
+    this.startActivity(intent);
+  }  
 }