Java tutorial
/* * Copyright Google Inc. All Rights Reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package net.arvin.pictureselectordemo; import android.annotation.TargetApi; import android.app.Activity; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.content.pm.PackageManager; import android.net.Uri; import android.os.Build; import android.provider.Settings; import android.support.annotation.Nullable; import android.support.annotation.StringRes; import android.support.v4.app.ActivityCompat; import android.support.v4.app.Fragment; import android.support.v4.content.ContextCompat; import android.support.v7.app.AlertDialog; import java.util.ArrayList; import java.util.Arrays; import java.util.List; /** * Android M (API >= 23). */ public class EasyPermissions { public static final int SETTINGS_REQ_CODE = 16061; private static final String TAG = "EasyPermissions"; public interface PermissionCallbacks extends ActivityCompat.OnRequestPermissionsResultCallback { void onPermissionsGranted(int requestCode, List<String> perms); void onPermissionsDenied(int requestCode, List<String> perms); void onPermissionsAllGranted(); } /** */ public static boolean hasPermissions(Context context, String... perms) { // Always return true for SDK < M, let the system deal with the permissions if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) { return true; } for (String perm : perms) { boolean hasPerm = (ContextCompat.checkSelfPermission(context, perm) == PackageManager.PERMISSION_GRANTED); if (!hasPerm) { return false; } } return true; } /** */ public static void requestPermissions(final Object object, String rationale, final int requestCode, final String... perms) { requestPermissions(object, rationale, android.R.string.ok, android.R.string.cancel, requestCode, perms); } /** */ public static void requestPermissions(final Object object, String rationale, @StringRes int positiveButton, @StringRes int negativeButton, final int requestCode, final String... perms) { checkCallingObjectSuitability(object); boolean shouldShowRationale = false; for (String perm : perms) { shouldShowRationale = shouldShowRationale || shouldShowRequestPermissionRationale(object, perm); } if (shouldShowRationale) { Activity activity = getActivity(object); if (null == activity) { return; } AlertDialog dialog = new AlertDialog.Builder(activity).setMessage(rationale) .setPositiveButton(positiveButton, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { executePermissionsRequest(object, perms, requestCode); } }).setNegativeButton(negativeButton, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // act as if the permissions were denied if (object instanceof PermissionCallbacks) { ((PermissionCallbacks) object).onPermissionsDenied(requestCode, Arrays.asList(perms)); } } }).create(); dialog.show(); } else { executePermissionsRequest(object, perms, requestCode); } } /** * */ public static void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults, Object object) { checkCallingObjectSuitability(object); // Make a collection of granted and denied permissions from the request. ArrayList<String> granted = new ArrayList<>(); ArrayList<String> denied = new ArrayList<>(); for (int i = 0; i < permissions.length; i++) { String perm = permissions[i]; if (grantResults[i] == PackageManager.PERMISSION_GRANTED) { granted.add(perm); } else { denied.add(perm); } } // Report granted permissions, if any. if (!granted.isEmpty()) { // Notify callbacks if (object instanceof PermissionCallbacks) { ((PermissionCallbacks) object).onPermissionsGranted(requestCode, granted); } } // Report denied permissions, if any. if (!denied.isEmpty()) { if (object instanceof PermissionCallbacks) { ((PermissionCallbacks) object).onPermissionsDenied(requestCode, denied); } } // If 100% successful, call annotated methods if (!granted.isEmpty() && denied.isEmpty()) { if (object instanceof PermissionCallbacks) ((PermissionCallbacks) object).onPermissionsAllGranted(); } } public static boolean checkDeniedPermissionsNeverAskAgain(final Object object, String rationale, @StringRes int positiveButton, @StringRes int negativeButton, List<String> deniedPerms) { return checkDeniedPermissionsNeverAskAgain(object, rationale, positiveButton, negativeButton, null, deniedPerms); } public static boolean checkDeniedPermissionsNeverAskAgain(final Object object, String rationale, @StringRes int positiveButton, @StringRes int negativeButton, @Nullable DialogInterface.OnClickListener negativeButtonOnClickListener, List<String> deniedPerms) { boolean shouldShowRationale; for (String perm : deniedPerms) { shouldShowRationale = shouldShowRequestPermissionRationale(object, perm); if (!shouldShowRationale) { final Activity activity = getActivity(object); if (null == activity) { return true; } AlertDialog dialog = new AlertDialog.Builder(activity).setMessage(rationale) .setPositiveButton(positiveButton, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS); Uri uri = Uri.fromParts("package", activity.getPackageName(), null); intent.setData(uri); startAppSettingsScreen(object, intent); } }).setNegativeButton(negativeButton, negativeButtonOnClickListener).create(); dialog.show(); return true; } } return false; } public static boolean checkDeniedPermissionsNeverAskAgain(final Object object, String rationale, String positiveButton, String negativeButton, @Nullable DialogInterface.OnClickListener negativeButtonOnClickListener, List<String> deniedPerms) { boolean shouldShowRationale; for (String perm : deniedPerms) { shouldShowRationale = shouldShowRequestPermissionRationale(object, perm); if (!shouldShowRationale) { final Activity activity = getActivity(object); if (null == activity) { return true; } AlertDialog dialog = new AlertDialog.Builder(activity).setMessage(rationale) .setPositiveButton(positiveButton, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS); Uri uri = Uri.fromParts("package", activity.getPackageName(), null); intent.setData(uri); startAppSettingsScreen(object, intent); } }).setNegativeButton(negativeButton, negativeButtonOnClickListener).create(); dialog.show(); return true; } } return false; } @TargetApi(23) private static boolean shouldShowRequestPermissionRationale(Object object, String perm) { if (object instanceof Activity) { return ActivityCompat.shouldShowRequestPermissionRationale((Activity) object, perm); } else if (object instanceof Fragment) { return ((Fragment) object).shouldShowRequestPermissionRationale(perm); } else if (object instanceof android.app.Fragment) { return ((android.app.Fragment) object).shouldShowRequestPermissionRationale(perm); } else { return false; } } @TargetApi(23) private static void executePermissionsRequest(Object object, String[] perms, int requestCode) { checkCallingObjectSuitability(object); if (object instanceof Activity) { ActivityCompat.requestPermissions((Activity) object, perms, requestCode); } else if (object instanceof Fragment) { ((Fragment) object).requestPermissions(perms, requestCode); } else if (object instanceof android.app.Fragment) { ((android.app.Fragment) object).requestPermissions(perms, requestCode); } } private static Activity getActivity(Object object) { if (object instanceof Activity) { return ((Activity) object); } else if (object instanceof Fragment) { return ((Fragment) object).getActivity(); } else if (object instanceof android.app.Fragment) { return ((android.app.Fragment) object).getActivity(); } else { return null; } } private static void startAppSettingsScreen(Object object, Intent intent) { if (object instanceof Activity) { ((Activity) object).startActivityForResult(intent, SETTINGS_REQ_CODE); } else if (object instanceof Fragment) { ((Fragment) object).startActivityForResult(intent, SETTINGS_REQ_CODE); } else if (object instanceof android.app.Fragment) { ((android.app.Fragment) object).startActivityForResult(intent, SETTINGS_REQ_CODE); } } private static void checkCallingObjectSuitability(Object object) { // Make sure Object is an Activity or Fragment boolean isActivity = object instanceof Activity; boolean isSupportFragment = object instanceof Fragment; boolean isAppFragment = object instanceof android.app.Fragment; boolean isMinSdkM = Build.VERSION.SDK_INT >= Build.VERSION_CODES.M; if (!(isSupportFragment || isActivity || (isAppFragment && isMinSdkM))) { if (isAppFragment) { throw new IllegalArgumentException( "Target SDK needs to be greater than 23 if caller is android.app.Fragment"); } else { throw new IllegalArgumentException("Caller must be an Activity or a Fragment."); } } } }