/*
* 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 com.camnter.newlife.utils.permissions;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Context;
import android.content.DialogInterface;
import android.content.pm.PackageManager;
import android.os.Build;
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 android.util.Log;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
/**
* Utility to request and check System permissions for apps targeting Android M (API >= 23).
*/
public class EasyPermissions {
private static final String TAG = "EasyPermissions";
/**
* 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;
}
/**
* Request a set of permissions, showing rationale if the system requests it.
*
* @param object Activity or Fragment requesting permissions. Should implement
* {@link android.support.v4.app.ActivityCompat.OnRequestPermissionsResultCallback}
* or
* {android.support.v13.app.FragmentCompat.OnRequestPermissionsResultCallback}
* @param rationale a message explaining why the application needs this set of permissions,
* will
* be displayed if the user rejects the request the first time.
* @param requestCode request code to track this request, must be < 256.
* @param perms a set of permissions to be requested.
*/
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);
}
/**
* Request a set of permissions, showing rationale if the system requests it.
*
* @param object Activity or Fragment requesting permissions. Should implement
* {@link android.support.v4.app.ActivityCompat.OnRequestPermissionsResultCallback}
* or
* {android.support.v13.app.FragmentCompat.OnRequestPermissionsResultCallback}
* @param rationale a message explaining why the application needs this set of permissions,
* will
* be displayed if the user rejects the request the first time.
* @param positiveButton custom text for positive button
* @param negativeButton custom text for negative button
* @param requestCode request code to track this request, must be < 256.
* @param perms a set of permissions to be requested.
*/
public static void requestPermissions(final Object object, String rationale,
@StringRes int positiveButton, @StringRes
int negativeButton, final int requestCode, final String... perms) {
checkCallingObjectSuitability(object);
final PermissionCallbacks callbacks = (PermissionCallbacks) object;
boolean shouldShowRationale = false;
for (String perm : perms) {
shouldShowRationale = shouldShowRationale ||
shouldShowRequestPermissionRationale(object, perm);
}
if (shouldShowRationale) {
AlertDialog dialog = new AlertDialog.Builder(getActivity(object)).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
callbacks
.onPermissionsDenied(
requestCode,
Arrays.asList(
perms));
}
})
.create();
dialog.show();
} else {
executePermissionsRequest(object, perms, requestCode);
}
}
/**
* Handle the result of a permission request, should be called from the calling Activity's
* {@link android.support.v4.app.ActivityCompat.OnRequestPermissionsResultCallback#onRequestPermissionsResult(int,
* String[], int[])}
* method.
* <p/>
* If any permissions were granted or denied, the Activity will receive the appropriate
* callbacks through {@link PermissionCallbacks} and methods annotated with
* {@link AfterPermissionGranted} will be run if appropriate.
*
* @param requestCode requestCode argument to permission result callback.
* @param permissions permissions argument to permission result callback.
* @param grantResults grantResults argument to permission result callback.
* @param object the calling Activity or Fragment.
* @throws IllegalArgumentException if the calling Activity does not implement
* {@link PermissionCallbacks}.
*/
public static void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults, Object object) {
checkCallingObjectSuitability(object);
PermissionCallbacks callbacks = (PermissionCallbacks) 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
callbacks.onPermissionsGranted(requestCode, granted);
}
// Report denied permissions, if any.
if (!denied.isEmpty()) {
callbacks.onPermissionsDenied(requestCode, denied);
}
// If 100% successful, call annotated methods
if (!granted.isEmpty() && denied.isEmpty()) {
runAnnotatedMethods(object, requestCode);
}
}
@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;
}
}
private static void runAnnotatedMethods(Object object, int requestCode) {
Class clazz = object.getClass();
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 non-void method " + method.getName());
}
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);
}
}
}
}
}
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.");
}
}
// Make sure Object implements callbacks
if (!(object instanceof PermissionCallbacks)) {
throw new IllegalArgumentException("Caller must implement PermissionCallbacks.");
}
}
public interface PermissionCallbacks extends ActivityCompat.OnRequestPermissionsResultCallback {
void onPermissionsGranted(int requestCode, List<String> perms);
void onPermissionsDenied(int requestCode, List<String> perms);
}
}