Add permission requests for Android 6+

* Add request for the camera

Signed-off-by: goapunk <noobie@goapunks.net>

briar-android/src/main/java/org/briarproject/briar/android/activity/RequestCodes.java

@@ -10,5 +10,6 @@ public interface RequestCodes {
 	int REQUEST_WRITE_BLOG_POST = 6;
 	int REQUEST_SHARE_BLOG = 7;
 	int REQUEST_RINGTONE = 8;
+	int REQUEST_PERMISSION_CAMERA = 9;
 
 }

briar-android/src/main/java/org/briarproject/briar/android/keyagreement/KeyAgreementActivity.java

@@ -1,6 +1,15 @@
 package org.briarproject.briar.android.keyagreement;
 
+import android.Manifest;
+import android.Manifest.permission;
+import android.content.DialogInterface;
+import android.content.DialogInterface.OnClickListener;
+import android.content.pm.PackageManager;
 import android.os.Bundle;
+import android.support.annotation.UiThread;
+import android.support.v4.app.ActivityCompat;
+import android.support.v4.content.ContextCompat;
+import android.support.v7.app.AlertDialog.Builder;
 import android.support.v7.widget.Toolbar;
 import android.view.MenuItem;
 import android.widget.Toast;
@@ -19,19 +28,24 @@ import org.briarproject.bramble.api.keyagreement.event.KeyAgreementFinishedEvent
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
+import org.briarproject.briar.R.string;
+import org.briarproject.briar.R.style;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.activity.BriarActivity;
 import org.briarproject.briar.android.fragment.BaseFragment;
 import org.briarproject.briar.android.fragment.BaseFragment.BaseFragmentListener;
 import org.briarproject.briar.android.keyagreement.IntroFragment.IntroScreenSeenListener;
+import org.briarproject.briar.android.util.UiUtils;
 
 import java.util.logging.Logger;
 
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import static android.support.v4.content.PermissionChecker.PERMISSION_GRANTED;
 import static android.widget.Toast.LENGTH_LONG;
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.briar.android.activity.RequestCodes.REQUEST_PERMISSION_CAMERA;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
@@ -51,6 +65,8 @@ public class KeyAgreementActivity extends BriarActivity implements
 	@Inject
 	volatile IdentityManager identityManager;
 
+	private boolean continueClicked, gotCameraPermission;
+
 	@Override
 	public void injectActivity(ActivityComponent component) {
 		component.inject(this);
@@ -96,10 +112,26 @@ public class KeyAgreementActivity extends BriarActivity implements
 		}
 	}
 
+	@Override
+	protected void onPostResume() {
+		super.onPostResume();
+		//Workaround for https://code.google.com/p/android/issues/detail?id=190966
+		if (continueClicked && gotCameraPermission) {
+			showQrCodeFragment();
+		}
+	}
+
 	@Override
 	public void showNextScreen() {
 		// FIXME #824
 //		showNextFragment(ShowQrCodeFragment.newInstance());
+		continueClicked = true;
+		if (checkPermissions()) {
+			showQrCodeFragment();
+		}
+	}
+
+	private void showQrCodeFragment() {
 		BaseFragment f = ShowQrCodeFragment.newInstance();
 		getSupportFragmentManager().beginTransaction()
 				.replace(R.id.fragmentContainer, f, f.getUniqueTag())
@@ -107,6 +139,76 @@ public class KeyAgreementActivity extends BriarActivity implements
 				.commit();
 	}
 
+	private boolean checkPermissions() {
+		if (ContextCompat.checkSelfPermission(this, permission.CAMERA) !=
+				PackageManager.PERMISSION_GRANTED) {
+			// Should we show an explanation?
+			if (ActivityCompat.shouldShowRequestPermissionRationale(this,
+					permission.CAMERA)) {
+				OnClickListener proceedListener = new OnClickListener() {
+					@Override
+					public void onClick(DialogInterface dialog, int which) {
+						requestPermission();
+					}
+				};
+				Builder builder = new Builder(this, style.BriarDialogTheme);
+				builder.setTitle(string.permission_camera_title);
+				builder.setMessage(string.permission_camera_request_text);
+				builder.setNeutralButton(string.continue_button,
+						proceedListener);
+				builder.show();
+			} else {
+				requestPermission();
+			}
+			return false;
+		} else {
+			return true;
+		}
+	}
+
+	private void requestPermission() {
+		ActivityCompat.requestPermissions(this,
+				new String[] {permission.CAMERA},
+				REQUEST_PERMISSION_CAMERA);
+	}
+
+	@Override
+	@UiThread
+	public void onRequestPermissionsResult(int requestCode,
+			String permissions[], int[] grantResults) {
+		if (requestCode == REQUEST_PERMISSION_CAMERA) {
+			// If request is cancelled, the result arrays are empty.
+			if (grantResults.length > 0 &&
+					grantResults[0] == PERMISSION_GRANTED) {
+				gotCameraPermission = true;
+			} else {
+				if (!ActivityCompat.shouldShowRequestPermissionRationale(this,
+						permission.CAMERA)) {
+					Builder builder = new Builder(this, style.BriarDialogTheme);
+					builder.setTitle(string.permission_camera_title);
+					builder.setMessage(string.permission_camera_perm_denied);
+					builder.setPositiveButton(string.open_settings,
+							UiUtils.getGoToSettingsListener(
+									this));
+					builder.setNegativeButton(string.cancel,
+							new OnClickListener() {
+								@Override
+								public void onClick(
+										DialogInterface dialog,
+										int which) {
+									supportFinishAfterTransition();
+								}
+							});
+					builder.show();
+				} else {
+					Toast.makeText(this, string.permission_camera_denied_toast,
+							LENGTH_LONG).show();
+					supportFinishAfterTransition();
+				}
+			}
+		}
+	}
+
 	@Override
 	public void eventOccurred(Event e) {
 		if (e instanceof KeyAgreementFinishedEvent) {
@@ -189,5 +291,4 @@ public class KeyAgreementActivity extends BriarActivity implements
 			}
 		});
 	}
-
 }

briar-android/src/main/java/org/briarproject/briar/android/keyagreement/ShowQrCodeFragment.java

@@ -114,6 +114,7 @@ public class ShowQrCodeFragment extends BaseEventFragment
 	public View onCreateView(LayoutInflater inflater,
 			@Nullable ViewGroup container,
 			@Nullable Bundle savedInstanceState) {
+
 		return inflater.inflate(R.layout.fragment_keyagreement_qr, container,
 				false);
 	}
@@ -143,13 +144,11 @@ public class ShowQrCodeFragment extends BaseEventFragment
 	@Override
 	public void onStart() {
 		super.onStart();
-
 		try {
 			cameraView.start();
 		} catch (CameraException e) {
 			logCameraExceptionAndFinish(e);
 		}
-
 		// Listen for changes to the Bluetooth state
 		IntentFilter filter = new IntentFilter();
 		filter.addAction(ACTION_STATE_CHANGED);
@@ -157,7 +156,8 @@ public class ShowQrCodeFragment extends BaseEventFragment
 		getActivity().registerReceiver(receiver, filter);
 
 		// Enable BT adapter if it is not already on.
-		final BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
+		final BluetoothAdapter adapter =
+				BluetoothAdapter.getDefaultAdapter();
 		if (adapter != null && !adapter.isEnabled()) {
 			waitingForBluetooth = true;
 			androidExecutor.runOnBackgroundThread(new Runnable() {

briar-android/src/main/java/org/briarproject/briar/android/util/UiUtils.java

@@ -1,6 +1,11 @@
 package org.briarproject.briar.android.util;
 
 import android.content.Context;
+
+import android.content.DialogInterface;
+import android.content.DialogInterface.OnClickListener;
+import android.content.Intent;
+import android.net.Uri;
 import android.support.design.widget.TextInputLayout;
 import android.support.v4.app.FragmentManager;
 import android.support.v4.content.ContextCompat;
@@ -18,12 +23,14 @@ import android.view.View;
 import android.widget.TextView;
 
 import org.briarproject.bramble.api.contact.ContactId;
+import org.briarproject.briar.BuildConfig;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.view.ArticleMovementMethod;
 import org.briarproject.briar.android.widget.LinkDialogFragment;
 
 import javax.annotation.Nullable;
 
+import static android.content.Intent.*;
 import static android.text.format.DateUtils.DAY_IN_MILLIS;
 import static android.text.format.DateUtils.FORMAT_ABBREV_MONTH;
 import static android.text.format.DateUtils.FORMAT_ABBREV_RELATIVE;
@@ -31,6 +38,7 @@ import static android.text.format.DateUtils.FORMAT_ABBREV_TIME;
 import static android.text.format.DateUtils.FORMAT_SHOW_DATE;
 import static android.text.format.DateUtils.MINUTE_IN_MILLIS;
 import static android.text.format.DateUtils.WEEK_IN_MILLIS;
+import static org.briarproject.briar.BuildConfig.*;
 import static org.briarproject.briar.android.BriarApplication.EXPIRY_DATE;
 
 public class UiUtils {
@@ -126,5 +134,19 @@ public class UiUtils {
 	public static String getBulbTransitionName(ContactId c) {
 		return "bulb" + c.getInt();
 	}
-	
+
+	public static OnClickListener getGoToSettingsListener(
+			final Context context) {
+		return new OnClickListener() {
+			@Override
+			public void onClick(DialogInterface dialog, int which) {
+				Intent i = new Intent();
+				i.setAction("android.settings.APPLICATION_DETAILS_SETTINGS");
+				i.addCategory(CATEGORY_DEFAULT);
+				i.setData(Uri.parse("package:" + APPLICATION_ID));
+				i.addFlags(FLAG_ACTIVITY_NEW_TASK);
+				context.startActivity(i);
+			}
+		};
+	}
 }

briar-android/src/main/res/values/strings.xml

@@ -381,4 +381,11 @@
 	<string name="screen_filter_title">Screen overlay detected</string>
 	<string name="screen_filter_body">Another app is drawing on top of Briar. To protect your security, Briar will not respond to touches when another app is drawing on top.\n\nTry turning off the following apps when using Briar:\n\n%1$s</string>
 
+	<!-- Permission Requests and Doze Mode -->
+	<string name="permission_camera_title">Camera permission</string>
+	<string name="permission_camera_request_text">To scan the QR code, Briar needs access to the camera.</string>
+	<string name="permission_camera_perm_denied">You have denied access to the camera, but adding contacts requires using the camera. Please consider granting access.</string>
+	<string name="permission_camera_denied_toast">Camera permission was not granted</string>
+	<string name="open_settings">Open Settings</string>
+
 </resources>