ActivityCompat.requestPermissions不显示提示
我正在尝试请求ACCESS_FINE_LOCATION权限以获取用户的当前位置。
我的日志记录表明我的应用程序在查询ContextCompat.checkSelfPermission()时当前没有此权限，但是当调用ActivityCompat.requestPermissions()不会显示任何内容。
我的Google地图代码（实现OnMapReadyCallback和ActivityCompat.OnRequestPermissionsResultCallback() ）位于FragmentActivity 。
我已经设法让requestPermissions()函数在应用程序的其他活动中成功运行，它只是带有Google地图的那个。 放置在Activity的onCreate()方法或onMapReady() （它需要去的地方）时，它onMapReady() 。
if(ContextCompat.checkSelfPermission(LocationActivity.this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) { Log.d(TAG, "not granted"); final String[] permissions = new String[] {android.Manifest.permission.ACCESS_FINE_LOCATION}; if(ActivityCompat.shouldShowRequestPermissionRationale(this, android.Manifest.permission.ACCESS_FINE_LOCATION)) { Log.d(TAG, "rationale"); // Explain to the user why permission is required, then request again AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setMessage("We need permissions") .setCancelable(false) .setPositiveButton("OK", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { ActivityCompat.requestPermissions(LocationActivity.this, permissions, 1); } }); AlertDialog alert = builder.create(); alert.show(); } else { Log.d(TAG, "request" + android.Manifest.permission.ACCESS_FINE_LOCATION); // If permission has not been denied before, request the permission ActivityCompat.requestPermissions(LocationActivity.this, permissions, 1); } } else { Log.d(TAG, "granted"); }
有任何想法吗？ 它与我的Activity类（ FragmentActivity ）有关，还是可能是谷歌地图异步调用权限请求？
完全剥离我的课程后，它仍然无法正常工作，我意识到这个Activity正在使用TabHost进行实例化。
当我停止使用TabHost时，会成功显示提示。 我猜新的权限提示不支持TabHosts – 这是一个错误吗？
与App请求未显示相同的问题
我最终创建了一个PermissionsRequestActivity，它代表我的TabHost处理权限请求和响应，然后退出（通过Intent extras Bundle传递请求的权限信息）。
它将对请求的响应作为广播传回，由我的TabHost接收。
一点点黑客但工作正常！
检查您是否已经在Android的清单文件中添加了所请求的权限，就像Android M之前一样，只有这样您才能获得预期的行为。
将权限添加到清单，以便您可以通过ActivityCompat.requestPermissions请求它：
我将分享适合我的代码。 在我想要查看提示的我的活动的受保护的void onCreate（Bundle savedInstanceState）{}方法中，我包含了以下代码：
/* Check whether the app has the ACCESS_FINE_LOCATION permission and whether the app op that corresponds to * this permission is allowed. The return value is an int: The permission check result which is either * PERMISSION_GRANTED or PERMISSION_DENIED or PERMISSION_DENIED_APP_OP. * Source: https://developer.android.com/reference/android/support/v4/content/PermissionChecker.html * While testing, the return value is -1 when the "Your location" permission for the App is OFF, and 1 when it is ON. */ int permissionCheck = ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION); // The "Your location" permission for the App is OFF. if (permissionCheck == -1){ /* This message will appear: "Allow [Name of my App] to access this device's location?" * "[Name of my Activity]._instance" is the activity. */ ActivityCompat.requestPermissions([Name of my Activity]._instance, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_CODE_ACCESS_FINE_LOCATION); }else{ // The "Your location" permission for the App is ON. if (permissionCheck == 0){ } }
在protected void onCreate（Bundle savedInstanceState）{}方法之前，我创建了以下常量和方法：
public static final int REQUEST_CODE_ACCESS_FINE_LOCATION = 1; // For implementation of permission requests for Android 6.0 with API Level 23. // Code from "Handle the permissions request response" at https://developer.android.com/training/permissions/requesting.html. @Override public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) { switch (requestCode) { case REQUEST_CODE_ACCESS_FINE_LOCATION: { // If request is cancelled, the result arrays are empty. if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { // permission was granted, yay! Do the // location-related task you need to do. } else { // permission denied, boo! Disable the // functionality that depends on this permission. } return; } // other 'case' lines to check for other // permissions this app might request } }
我在使用TabHost的项目上遇到了同样的问题。 基于@Robin解决方案，我使用EventBus库从子活动向TabActity发送消息。
EventBus： https ： //github.com/greenrobot/EventBus
创建一个事件对象：
public class MessageEvent { private String message; public MessageEvent(String message){ this.message = message; } public String getMessage(){ return this.message; } }
在您的主要活动中：
private EventBus eventBus = EventBus.getDefault(); @Override protected void onCreate(Bundle savedInstanceState) { eventBus.register(this); } @Override protected void onDestroy() { eventBus.unregister(this); super.onDestroy(); } @Subscribe(threadMode = ThreadMode.MAIN) public void onMessageEvent(MessageEvent event) { if (event.getMessage().equals("contacts")){ if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && checkSelfPermission(android.Manifest.permission.WRITE_CONTACTS) != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(MainPage.this,new String[]{android.Manifest.permission.WRITE_CONTACTS}, 100 ); } } };
为要请求的权限设置不同的消息。 在您的孩子活动中，您可以发布适当的消息：
EventBus.getDefault().post(new MessageEvent("contacts"));
请注意onRequestPermissionsResult回调和请求代码;）！ 它只适用于主要活动。