android - 运行时权限 : shouldshowrequestpermissionrationale always returns false

Question

下面是我的代码，我调用此代码以获得运行时权限。在这种情况下，“shouldshowrequestpermissionrationale 总是返回 false”。我找不到解决方案为什么会这样。因此，未显示运行时权限警报。请给我一个解决方案...

   private void checkRuntimePermission() {

    Logger.infoLog("checkRuntimePermission");
    if(ActivityCompat.checkSelfPermission(this, permissionsRequired[0]) != PackageManager.PERMISSION_GRANTED){
        Logger.infoLog("checkRuntimePermission first if");
        if(ActivityCompat.shouldShowRequestPermissionRationale(WelcomeActivity.this,permissionsRequired[0])){
            Logger.infoLog("checkRuntimePermission if");
            //just request the permission
            //Show Information about why you need the permission
            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setTitle("Need Multiple Permissions");
            builder.setMessage("This app needs Camera and Location permissions.");
            builder.setPositiveButton("Grant", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.cancel();
                    ActivityCompat.requestPermissions(WelcomeActivity.this,permissionsRequired,PERMISSION_CALLBACK_CONSTANT);
                }
            });
            builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.cancel();
                }
            });
            builder.show();
        }else{
            Logger.infoLog("Show request permission rationale false");
        }
    } else {
        //You already have the permission, just go ahead.
        Logger.infoLog("Permission given already");
        proceedAfterPermission();
    }
}

Answer 1

在谷歌文档中:

"This method returns true if the app has requested this permission previously and the user denied the request."

所以，你应该调用 请求权限(...) 首先，然后使用 应该ShowRequestPermissionRationale(...) 可以得到你想要的结果。

最好的方法是始终使用 请求权限(...) 在 onRequestPermissionsResult(...)