动态申请权限的坑

1、 permission_group

　　　　直接取申请 group 不会弹出申请权限的框

2、

onClieck():

1    public void onClick(View view) {
2         if (ContextCompat.checkSelfPermission(this, Manifest.permission_group.STORAGE)!=PackageManager.PERMISSION_GRANTED
3 //        ||ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE)!=PackageManager.PERMISSION_GRANTED
4                 ){
5             Log.d(TAG, "没有权限: ");
6             ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.READ_EXTERNAL_STORAGE,Manifest.permission.WRITE_EXTERNAL_STORAGE},REQUEST_STORAGE_GROUP_CODE);
7             return;
8         }

onRequestPermissionsResult():

 1     @Override
 2     public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
 3         switch (requestCode){
 4             case REQUEST_STORAGE_GROUP_CODE :
 5                 if (grantResults.length>0&&grantResults[0]==PackageManager.PERMISSION_GRANTED){
 6                     Log.d(TAG, "获取到权限: ");
 7                 }
 8         }
 9 
10     }

运行日志：

05-23 15:04:38.080 11151-11151/com.example.videodownload D/MainActivity: 没有权限: 
05-23 15:04:38.120 11151-11151/com.example.videodownload D/MainActivity: 获取到权限: 
05-23 15:04:44.651 11151-11151/com.example.videodownload D/MainActivity: 没有权限: 
05-23 15:04:44.684 11151-11151/com.example.videodownload D/MainActivity: 获取到权限: 
05-23 15:04:45.020 11151-11151/com.example.videodownload D/MainActivity: 没有权限: 
05-23 15:04:45.050 11151-11151/com.example.videodownload D/MainActivity: 获取到权限: 
05-23 15:04:45.310 11151-11151/com.example.videodownload D/MainActivity: 没有权限: 
05-23 15:04:45.337 11151-11151/com.example.videodownload D/MainActivity: 获取到权限: