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);
+			}
+		};
+	}
 }