android 权限询问 android开发权限询问的代码实例
你的益达233 人气:0想了解android开发权限询问的代码实例的相关内容吗,你的益达233在本文为您仔细讲解android 权限询问的相关知识和一些Code实例,欢迎阅读和指正,我们先划重点:android,权限询问,android,询问权限,下面大家一起来学习吧。
现在基于信息安全问题,特别是版本是23以上权限越严格。
特别是拍照,读,写权限
一般权限允许过,下次就不用询问了的,所以很多应用都喜欢在首页或者启动页直接询问,不允许的就用不了1、下面给出封装好的类,至于什么时候调看项目需要
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.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."); } }}
注:这个类不是我写的,分享给大家
2、调用示例(activity或fragment):(方法调用的时机随你)
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); } }
3、拒绝和允许做的操作(activity或fragment):
@Override public void onPermissionsGranted(List<String> list) { //允许 getPhotos(); } @Override public void onPermissionsDenied(List<String> list) { //拒绝 mTvEmptyView.setText(R.string.permissions_denied_tips); //mIvTakePhoto.setVisibility(View.GONE); }
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