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 la.xiong.mylibrary; import android.annotation.TargetApi; import android.app.Activity; import android.content.Context; 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.NonNull; import android.support.annotation.RequiresApi; 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.util.Log; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.util.ArrayList; import java.util.List; public class EasyPermissions { private static final String TAG = "EasyPermissions"; private static final String DIALOG_TAG = "RationaleDialogFragmentCompat"; /** * ? */ public interface PermissionCallbacks extends ActivityCompat.OnRequestPermissionsResultCallback { void onPermissionsGranted(int requestCode, List<String> perms); void onPermissionsDenied(int requestCode, List<String> perms); } /** * ? */ public interface PermissionWithDialogCallbacks extends PermissionCallbacks { void onDialog(int requestCode, int dialogType, DialogCallback callback); } /** * ?? */ public interface DialogCallback { void onGranted(); } /** * Check if the calling context has a set of permissions. * * @param context the calling context. * @param perms one ore more permissions, such as {@code android.Manifest.permission.CAMERA}. * @return true if all permissions are already granted, false if at least one permission * is not yet granted. */ 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) { Log.w(TAG, "hasPermissions: API version < M, returning true by default"); 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(Object object, int requestCode, String... perms) { requestPermissions(object, 0, requestCode, android.R.string.ok, android.R.string.cancel, false, perms); } public static void requestPermissions(Object object, int dialogType, int requestCode, String... perms) { requestPermissions(object, dialogType, requestCode, 0, 0, true, perms); } public static void requestPermissions(final Object object, int dialogType, final int requestCode, int positiveButton, int negativeButton, boolean isAppDialog, 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; } //appdialog if (isAppDialog == true) { if (object instanceof PermissionWithDialogCallbacks) { ((PermissionWithDialogCallbacks) object).onDialog(requestCode, dialogType, new DialogCallback() { @Override public void onGranted() { executePermissionsRequest(object, perms, requestCode); } }); } } else { showRationaleDialogFragment(activity.getFragmentManager(), activity.getString(R.string.title_rationale_dialog), positiveButton, negativeButton, requestCode, perms); } } else { executePermissionsRequest(object, perms, requestCode); } } public static boolean somePermissionPermanentlyDenied(Object object, final List<String> deniedPermissions) { for (String deniedPermission : deniedPermissions) { if (permissionPermanentlyDenied(object, deniedPermission)) { return true; } } return false; } public static boolean permissionPermanentlyDenied(Object object, String deniedPermission) { return !shouldShowRequestPermissionRationale(object, deniedPermission); } public static void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults, Object... receivers) { // 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); } } // iterate through all receivers for (Object object : receivers) { // Report granted permissions, if any. if (!granted.isEmpty()) { 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()) { runAnnotatedMethods(object, requestCode); } } } public static void goSettingsPermissions(final Object object, final int requestCode, final int requestCodeForResult) { goSettingsPermissions(object, 0, requestCode, requestCodeForResult, false); } public static void goSettingsPermissions(final Object object, int dialogType, final int requestCode, final int requestCodeForResult) { goSettingsPermissions(object, dialogType, requestCode, requestCodeForResult, true); } public static void goSettingsPermissions(final Object object, int dialogType, final int requestCode, final int requestCodeForResult, boolean isAppDialog) { checkCallingObjectSuitability(object); final Activity activity = getActivity(object); if (null == activity) { return; } //appdialog if (isAppDialog == true) { if (object instanceof PermissionWithDialogCallbacks) { ((PermissionWithDialogCallbacks) object).onDialog(requestCode, dialogType, new DialogCallback() { @Override public void onGranted() { Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS); Uri uri = Uri.fromParts("package", activity.getPackageName(), null); intent.setData(uri); startForResult(object, intent, requestCodeForResult); } }); } } else { //TODO easypermissiondialog } } @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); } } @TargetApi(11) 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; } } @TargetApi(11) private static void startForResult(Object object, Intent intent, int requestCode) { if (object instanceof Activity) { ((Activity) object).startActivityForResult(intent, requestCode); } else if (object instanceof Fragment) { ((Fragment) object).startActivityForResult(intent, requestCode); } else if (object instanceof android.app.Fragment) { ((android.app.Fragment) object).startActivityForResult(intent, requestCode); } } 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."); } } } /** * Find all methods annotated with {@link } on a given object with the * correc requestCode argument. * @param object the object with annotated methods. * @param requestCode the requestCode passed to the annotation. */ private static void runAnnotatedMethods(@NonNull Object object, int requestCode) { Class clazz = object.getClass(); if (isUsingAndroidAnnotations(object)) { clazz = clazz.getSuperclass(); } while (clazz != null) { for (Method method : clazz.getDeclaredMethods()) { if (method.isAnnotationPresent(AfterPermissionGranted.class)) { // Check for annotated methods with matching request code. AfterPermissionGranted ann = method.getAnnotation(AfterPermissionGranted.class); if (ann.value() == requestCode) { // Method must be void so that we can invoke it if (method.getParameterTypes().length > 0) { throw new RuntimeException("Cannot execute method " + method.getName() + " because it is non-void method and/or has input parameters."); } try { // Make method accessible if private if (!method.isAccessible()) { method.setAccessible(true); } method.invoke(object); } catch (IllegalAccessException e) { Log.e(TAG, "runDefaultMethod:IllegalAccessException", e); } catch (InvocationTargetException e) { Log.e(TAG, "runDefaultMethod:InvocationTargetException", e); } } } } clazz = clazz.getSuperclass(); } } /** * Determine if the project is using the AndroidAnnoations library. */ private static boolean isUsingAndroidAnnotations(@NonNull Object object) { if (!object.getClass().getSimpleName().endsWith("_")) { return false; } try { Class clazz = Class.forName("org.androidannotations.api.view.HasViews"); return clazz.isInstance(object); } catch (ClassNotFoundException e) { return false; } } /** * Show a {@link RationaleDialogFragment} explaining permission request rationale. */ @RequiresApi(api = Build.VERSION_CODES.HONEYCOMB) private static void showRationaleDialogFragment(@NonNull android.app.FragmentManager fragmentManager, @NonNull String rationale, @StringRes int positiveButton, @StringRes int negativeButton, int requestCode, @NonNull String... perms) { RationaleDialogFragment.newInstance(positiveButton, negativeButton, rationale, requestCode, perms) .show(fragmentManager, DIALOG_TAG); } }