android开发权限询问的示例代码

public class EasyPermissions {private static final String TAG = "EasyPermissions";public interface PermissionCallbacks extends    ActivityCompat.OnRequestPermissionsResultCallback {  void onPermissionsGranted(List<String> perms);  void onPermissionsDenied(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/119023.html">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) {  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 ActivityCompat.OnRequestPermissionsResultCallback} *          or *          {@link 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 ActivityCompat.OnRequestPermissionsResultCallback} *            or *            {@link 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);  boolean shouldShowRationale = false;  for (String perm : perms) {    shouldShowRationale = shouldShowRationale || shouldShowRequestPermissionRationale(object, perm);  }  if (shouldShowRationale) {    //弹框询问    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) {            // Do nothing, user does not want to request            PermissionCallbacks callbacks = (PermissionCallbacks) object;            if(callbacks != null) {              callbacks.onPermissionsDenied(new ArrayList<String>());            }          }        }).create();    dialog.show();  } else {    executePermissionsRequest(object, perms, requestCode);  }}/** * Handle the result of a permission request, should be called from the calling Activity's * {@link 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(granted);  }  // Report denied permissions, if any.  if (!denied.isEmpty()) {    callbacks.onPermissionsDenied(denied);  }  // If 100% successful, call annotated methods  if (!granted.isEmpty() && denied.isEmpty()) {    runAnnotatedMethods(object, requestCode);  }}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 {    return false;  }}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);  }}private static Activity getActivity(Object object) {  if (object instanceof Activity) {    return ((Activity) object);  } else if (object instanceof Fragment) {    return ((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) {          ILogger.e(TAG, "runDefaultMethod:IllegalAccessException", e);        } catch (InvocationTargetException e) {          ILogger.e(TAG, "runDefaultMethod:InvocationTargetException", e);        }      }    }  }}private static void checkCallingObjectSuitability(Object object) {  // Make sure Object is an Activity or Fragment  if (!((object instanceof Fragment) || (object instanceof Activity))) {    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.");  }}}

private void requestGalleryPermission() {  //权限参数可以添加很多，不固定参数的  if (EasyPermissions.hasPermissions(this, Manifest.permission.READ_EXTERNAL_STORAGE,Manifest.permission.WRITE_EXTERNAL_STORAGE)) {    getPhotos();//如果具有权限做的操作  } else {    // Ask for one permission    EasyPermissions.requestPermissions(this, getString(R.string.permissions_tips_gallery),        GalleryFinal.PERMISSIONS_CODE_GALLERY, Manifest.permission.READ_EXTERNAL_STORAGE,Manifest.permission.WRITE_EXTERNAL_STORAGE);  }}

@Overridepublic void onPermissionsGranted(List<String> list) {  //允许  getPhotos();}@Overridepublic void onPermissionsDenied(List<String> list) {  //拒绝  mTvEmptyView.setText(R.string.permissions_denied_tips);  //mIvTakePhoto.setVisibility(View.GONE);}