android申请权限

if(ContextCompat.checkSelfPermission(getActivity(),Manifest.permission.WRITE_CONTACTS)
            != PackageManager.PERMISSION_GRANTED){
        //Fragment中
        QuestionTypeAddFragment.this.requestPermissions(new String[]         {Manifest.permission.WRITE_CONTACTS},1);
        //Activity中
        ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
    } else {
        //有权限 做的事情
    }

    //处理权限申请回调
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        int flag = ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.WRITE_CONTACTS);
        // ==0 是点了确定 !=0 是 否定
        if (flag == PackageManager.PERMISSION_GRANTED){
             //有权限做的事情
        }
    }