如何在提示[复制]时知道用户是否允许权限

Question

当弹出权限对话框时，它会询问我是否要允许或拒绝某个权限。问题是，当我允许或拒绝时，动作不会执行。我如何知道他是否允许，以便我可以在接受时执行操作？

我试过：

int hasWriteExternalStoragePermission = ctx.checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE);
    if (hasWriteExternalStoragePermission == PackageManager.PERMISSION_GRANTED) {
        // my code
    }

但它没有执行，因为“为时已晚”

Answer 1

请尝试以下方法：

public  boolean isStoragePermissionGranted() 
{
    if (Build.VERSION.SDK_INT >= 23) 
    {
        if (checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE)
                == PackageManager.PERMISSION_GRANTED) 
        {
            Log.v(TAG,"Permission is granted");
            return true;
        } 
        else 
        {

            Log.v(TAG,"Permission is revoked");
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
            return false;
        }
    }
    else 
    { 
        //permission is automatically granted on sdk<23 upon installation
        Log.v(TAG,"Permission is granted <23");
        return true;
    }
}

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) 
{
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    if(grantResults[0]== PackageManager.PERMISSION_GRANTED)
    {
        Log.v(TAG,"Permission: "+permissions[0]+ "was "+grantResults[0]);
        //resume tasks needing this permission
    }

   else
   {
       Log.v(TAG,"Permission denied");
   }
}

这样，如果获得许可，它会来到这里：

• <代码>日志。v（标记“已授予许可”）

如果尚未授予权限，则会出现以下情况：

• Log. v（TAG，“权限被撤销”）；并尝试获取权限。

如果用户在运行时授予权限：

• <代码>日志。v（标签“Permission:“permissions[0]”是“grantResults[0]）

如果用户拒绝：

• <代码>日志。v（标记“拒绝许可”）

如果版本低于Marshamla，即低于API 23，那么它会出现在这里：

• Log. v（TAG，"授予权限

Answer 2

您需要重写此方法

@Override
public void onRequestPermissionsResult(int requestCode,
        String permissions[], int[] grantResults) {
    switch (requestCode) {
        case MY_PERMISSIONS_REQUEST_READ_CONTACTS: {
            // If request is cancelled, the result arrays are empty.
            if (grantResults.length > 0
                && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                // permission was granted, yay! Do the
                // contacts-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
    }
}

链接到官方文档

Answer 3

您必须覆盖onRequest estPermissionsResult函数，您将获得权限对话框弹出的回调。

像下面

public void onRequestPermissionsResult(int requestCode,
        String permissions[], int[] grantResults) {
    switch (requestCode) {
        case MY_PERMISSIONS_REQUEST_READ_CONTACTS: {
            // If request is cancelled, the result arrays are empty.
            if (grantResults.length > 0
                && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                // permission was granted
            } else {

                // permission denied
                // ask again or ignore

            }
            return;
        }

        // other 'case' lines to check for other
        // permissions this app might request
    }
}