Android shouldShowRequestPermissionRationale 有错误？
Android shouldShowRequestPermissionRationale has a bug?
我认为有一个错误shouldShowRequestPermissionRationale
代码是...
@Override
protected void onResume() {
super.onResume();
if(ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_DENIED &&
ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_DENIED) {
if(ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.ACCESS_COARSE_LOCATION) ||
ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.ACCESS_FINE_LOCATION)) {
new AlertDialog.Builder(this)....show();
} else {
// do something...
}
首先安装了应用程序，我们不允许该权限。所以当 onResume 被调用时，AlertDialog 应该出现。但是没有出现...
如果我们进入应用程序的设置，并允许权限。所以我们播放应用程序代码（// do something）。再次，我们进入应用程序的设置，拒绝权限。然后我们重新启动应用程序，AlertDialog 出现。
为什么应用会这样运行？
来自开发者文档：
shouldShowRequestPermissionRationale()
This method returns true if the app has requested this permission previously and the user denied the request.
Note: If the user turned down the permission request in the past and chose the Don't ask again option in the permission request system dialog, this method returns false.
问题是您在使用前没有请求权限
ActivityCompat.requestPermissions();
因此它没有显示对话框。
当您从“设置”手动授予权限或拒绝权限时，系统会假定您拒绝了该权限，这就是它显示警告对话框的原因。
使用 Gmail API 并在其示例代码中找到另一个关于 Android 权限的选项。您可能想使用 EasyPermissions，它是由 Google 本身提供的，如前所述，"Simplify Android M system permissions".
检查这个实现。对我来说很好用。基本上，您在传递权限列表的 checkPermissions() 方法中检查权限。您在 onRequestPermissionsResult() 上检查权限请求的结果。当用户选择 "never ask again" 或不选择时，该实现让您解决这两种情况。在这个实现中，如果 se 选择 "never ask again"，对话框有一个选项可以将他带到应用程序设置 Activity。
所有这些代码都在我的片段中。我在想创建一个专门的 class 会更好，比如 PermissionManager，但我不确定。
/**
* responsible for checking if permissions are granted. In case permissions are not granted, the user will be requested and the method returns false. In case we have all permissions, the method return true.
* The response of the request for the permissions is going to be handled in the onRequestPermissionsResult() method
* @param permissions list of permissions to be checked if are granted onRequestPermissionsResult().
* @param requestCode request code to identify this request in
* @return true case we already have all permissions. false in case we had to prompt the user for it.
*/
private boolean checkPermissions(List<String> permissions, int requestCode) {
List<String> permissionsNotGranted = new ArrayList<>();
for (String permission : permissions) {
if (ContextCompat.checkSelfPermission(getActivity(), permission) != PackageManager.PERMISSION_GRANTED)
permissionsNotGranted.add(permission);
}
//If there is any permission we don't have (it's going to be in permissionsNotGranted List) , we need to request.
if (!permissionsNotGranted.isEmpty()) {
requestPermissions(permissionsNotGranted.toArray(new String[permissionsNotGranted.size()]), requestCode);
return false;
}
return true;
}
/**
* called after permissions are requested to the user. This is called always, either
* has granted or not the permissions.
* @param requestCode int code used to identify the request made. Was passed as parameter in the
* requestPermissions() call.
* @param permissions Array containing the permissions asked to the user.
* @param grantResults Array containing the results of the permissions requested to the user.
*/
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
switch (requestCode) {
case YOUR_REQUEST_CODE: {
boolean anyPermissionDenied = false;
boolean neverAskAgainSelected = false;
// Check if any permission asked has been denied
for (int i = 0; i < grantResults.length; i++) {
if (grantResults[i] != PackageManager.PERMISSION_GRANTED) {
anyPermissionDenied = true;
//check if user select "never ask again" when denying any permission
if (!shouldShowRequestPermissionRationale(permissions[i])) {
neverAskAgainSelected = true;
}
}
}
if (!anyPermissionDenied) {
// All Permissions asked were granted! Yey!
// DO YOUR STUFF
} else {
// the user has just denied one or all of the permissions
// use this message to explain why he needs to grant these permissions in order to proceed
String message = "";
DialogInterface.OnClickListener listener = null;
if (neverAskAgainSelected) {
//This message is displayed after the user has checked never ask again checkbox.
message = getString(R.string.permission_denied_never_ask_again_dialog_message);
listener = new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//this will be executed if User clicks OK button. This is gonna take the user to the App Settings
startAppSettingsConfigActivity();
}
};
} else {
//This message is displayed while the user hasn't checked never ask again checkbox.
message = getString(R.string.permission_denied_dialog_message);
}
new AlertDialog.Builder(getActivity(), R.style.AlertDialogTheme)
.setMessage(message)
.setPositiveButton(getString(R.string.label_Ok), listener)
.setNegativeButton(getString(R.string.label_cancel), null)
.create()
.show();
}
}
break;
default:
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
/**
* start the App Settings Activity so that the user can change
* settings related to the application such as permissions.
*/
private void startAppSettingsConfigActivity() {
final Intent i = new Intent();
i.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
i.addCategory(Intent.CATEGORY_DEFAULT);
i.setData(Uri.parse("package:" + getActivity().getPackageName()));
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
i.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
i.addFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
getActivity().startActivity(i);
}
我认为有一个错误shouldShowRequestPermissionRationale
代码是...
@Override
protected void onResume() {
super.onResume();
if(ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_DENIED &&
ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_DENIED) {
if(ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.ACCESS_COARSE_LOCATION) ||
ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.ACCESS_FINE_LOCATION)) {
new AlertDialog.Builder(this)....show();
} else {
// do something...
}
首先安装了应用程序，我们不允许该权限。所以当 onResume 被调用时，AlertDialog 应该出现。但是没有出现...
如果我们进入应用程序的设置，并允许权限。所以我们播放应用程序代码（// do something）。再次，我们进入应用程序的设置，拒绝权限。然后我们重新启动应用程序，AlertDialog 出现。
为什么应用会这样运行？
来自开发者文档：
shouldShowRequestPermissionRationale()
This method returns true if the app has requested this permission previously and the user denied the request.
Note: If the user turned down the permission request in the past and chose the Don't ask again option in the permission request system dialog, this method returns false.
问题是您在使用前没有请求权限
ActivityCompat.requestPermissions();
因此它没有显示对话框。
当您从“设置”手动授予权限或拒绝权限时，系统会假定您拒绝了该权限，这就是它显示警告对话框的原因。
使用 Gmail API 并在其示例代码中找到另一个关于 Android 权限的选项。您可能想使用 EasyPermissions，它是由 Google 本身提供的，如前所述，"Simplify Android M system permissions".
检查这个实现。对我来说很好用。基本上，您在传递权限列表的 checkPermissions() 方法中检查权限。您在 onRequestPermissionsResult() 上检查权限请求的结果。当用户选择 "never ask again" 或不选择时，该实现让您解决这两种情况。在这个实现中，如果 se 选择 "never ask again"，对话框有一个选项可以将他带到应用程序设置 Activity。
所有这些代码都在我的片段中。我在想创建一个专门的 class 会更好，比如 PermissionManager，但我不确定。
/**
* responsible for checking if permissions are granted. In case permissions are not granted, the user will be requested and the method returns false. In case we have all permissions, the method return true.
* The response of the request for the permissions is going to be handled in the onRequestPermissionsResult() method
* @param permissions list of permissions to be checked if are granted onRequestPermissionsResult().
* @param requestCode request code to identify this request in
* @return true case we already have all permissions. false in case we had to prompt the user for it.
*/
private boolean checkPermissions(List<String> permissions, int requestCode) {
List<String> permissionsNotGranted = new ArrayList<>();
for (String permission : permissions) {
if (ContextCompat.checkSelfPermission(getActivity(), permission) != PackageManager.PERMISSION_GRANTED)
permissionsNotGranted.add(permission);
}
//If there is any permission we don't have (it's going to be in permissionsNotGranted List) , we need to request.
if (!permissionsNotGranted.isEmpty()) {
requestPermissions(permissionsNotGranted.toArray(new String[permissionsNotGranted.size()]), requestCode);
return false;
}
return true;
}
/**
* called after permissions are requested to the user. This is called always, either
* has granted or not the permissions.
* @param requestCode int code used to identify the request made. Was passed as parameter in the
* requestPermissions() call.
* @param permissions Array containing the permissions asked to the user.
* @param grantResults Array containing the results of the permissions requested to the user.
*/
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
switch (requestCode) {
case YOUR_REQUEST_CODE: {
boolean anyPermissionDenied = false;
boolean neverAskAgainSelected = false;
// Check if any permission asked has been denied
for (int i = 0; i < grantResults.length; i++) {
if (grantResults[i] != PackageManager.PERMISSION_GRANTED) {
anyPermissionDenied = true;
//check if user select "never ask again" when denying any permission
if (!shouldShowRequestPermissionRationale(permissions[i])) {
neverAskAgainSelected = true;
}
}
}
if (!anyPermissionDenied) {
// All Permissions asked were granted! Yey!
// DO YOUR STUFF
} else {
// the user has just denied one or all of the permissions
// use this message to explain why he needs to grant these permissions in order to proceed
String message = "";
DialogInterface.OnClickListener listener = null;
if (neverAskAgainSelected) {
//This message is displayed after the user has checked never ask again checkbox.
message = getString(R.string.permission_denied_never_ask_again_dialog_message);
listener = new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//this will be executed if User clicks OK button. This is gonna take the user to the App Settings
startAppSettingsConfigActivity();
}
};
} else {
//This message is displayed while the user hasn't checked never ask again checkbox.
message = getString(R.string.permission_denied_dialog_message);
}
new AlertDialog.Builder(getActivity(), R.style.AlertDialogTheme)
.setMessage(message)
.setPositiveButton(getString(R.string.label_Ok), listener)
.setNegativeButton(getString(R.string.label_cancel), null)
.create()
.show();
}
}
break;
default:
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
/**
* start the App Settings Activity so that the user can change
* settings related to the application such as permissions.
*/
private void startAppSettingsConfigActivity() {
final Intent i = new Intent();
i.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
i.addCategory(Intent.CATEGORY_DEFAULT);
i.setData(Uri.parse("package:" + getActivity().getPackageName()));
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
i.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
i.addFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
getActivity().startActivity(i);
}