官方推荐的android 6.0 权限获取方式（实例demo:easypermissions）

/* * 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 pub.devrel.easypermissions; import android.annotation.SuppressLint; 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.NonNull; import android.support.annotation.Nullable; 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.app.FragmentActivity; 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"; 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); } /** * 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(@NonNull Context context, @NonNull 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 {@code 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(@NonNull final Object object, @NonNull String rationale, final int requestCode, @NonNull 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 {@code 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. */ @SuppressLint("NewApi") public static void requestPermissions(@NonNull final Object object, @NonNull String rationale, @StringRes int positiveButton, @StringRes int negativeButton, final int requestCode, @NonNull final String... perms) { checkCallingObjectSuitability(object); // Determine if rationale should be shown (generally when the user has previously // denied the request); boolean shouldShowRationale = false; for (String perm : perms) { shouldShowRationale = shouldShowRationale || shouldShowRequestPermissionRationale(object, perm); } if (shouldShowRationale) { // If we can get a FragmentManager, show a RationaleDialogFragmentCompat. Otherwise, show // an AlertDialog. The Fragment has the advantage of surviving rotations. if (getSupportFragmentManager(object) != null) { // Show AppCompatDialogFragment showRationaleDialogFragmentCompat(getSupportFragmentManager(object), rationale, positiveButton, negativeButton, requestCode, perms); } else if (getFragmentManager(object) != null) { // Show DialogFragment showRationaleDialogFragment(getFragmentManager(object), rationale, positiveButton, negativeButton, requestCode, perms); } else { // Revert to AlertDialog showRationaleAlertDialog(object, rationale, positiveButton, negativeButton, requestCode, perms); } } else { executePermissionsRequest(object, perms, requestCode); } } /** * Show a {@link RationaleDialogFragmentCompat} explaining permission request rationale. */ @RequiresApi(Build.VERSION_CODES.HONEYCOMB) private static void showRationaleDialogFragmentCompat( @NonNull final android.support.v4.app.FragmentManager fragmentManager, @NonNull String rationale, @StringRes int positiveButton, @StringRes int negativeButton, final int requestCode, @NonNull final String... perms) { RationaleDialogFragmentCompat fragment = RationaleDialogFragmentCompat .newInstance(positiveButton, negativeButton, rationale, requestCode, perms); fragment.show(fragmentManager, DIALOG_TAG); } /** * Show a {@link RationaleDialogFragment} explaining permission request rationale. */ @RequiresApi(api = Build.VERSION_CODES.HONEYCOMB) private static void showRationaleDialogFragment( @NonNull final android.app.FragmentManager fragmentManager, @NonNull String rationale, @StringRes int positiveButton, @StringRes int negativeButton, final int requestCode, @NonNull fin