Android 权限：用户按下 "Allow" 后执行任务

Question

我想知道当用户按下 "Allow" 按钮访问联系人详细信息/访问日历等时，是否有一种方法可以识别事件，

我知道有一种方法可以通过 ActivityCompat.requestPermissions 请求权限，但是有没有一种方法可以在用户授予权限后立即执行操作？

Answer 1

调用 requestPermissions() 请求权限。您在 onRequestPermissionsResult() 中找到结果，并可以确定他们是否授予了权限。从您的应用程序代码的角度来看，那是 "right after"。

Answer 2

首先定义变量：

public static int MY_PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION = 1;

请求权限使用：

if (ActivityCompat.checkSelfPermission(this,
        android.Manifest.permission.ACCESS_FINE_LOCATION)
        != PackageManager.PERMISSION_GRANTED) {
    // Should we show an explanation?
    if (ActivityCompat.shouldShowRequestPermissionRationale(this,
            android.Manifest.permission.ACCESS_FINE_LOCATION)) {
        // Show an explanation to the user *asynchronously* -- don't block
        // this thread waiting for the user's response! After the user
        // sees the explanation, try again to request the permission.
    } else {
        // No explanation needed, we can request the permission.
        ActivityCompat.requestPermissions(this,
                new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, MY_PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION);
        // MY_PERMISSIONS_REQUEST_READ_CONTACTS is an
        // app-defined int constant. The callback method gets the
        // result of the request.
    }
}

现在使用以下方法获取结果：

     @Override
public void onRequestPermissionsResult(int requestCode,
        String permissions[], int[] grantResults) {
    switch (requestCode) {
        case MY_PERMISSIONS_REQUEST_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
                // contacts-related task you need to do.
                Toast.makeText(getApplicationContext(), "Permission granted", Toast.LENGTH_SHORT).show();

            } else {

                // permission denied, boo! Disable the
                // functionality that depends on this permission.
                Toast.makeText(getApplicationContext(), "Permission denied", Toast.LENGTH_SHORT).show();
            }
            return;
        }

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

片段

如果您在 fragment 中尝试此代码，请更改

checkSelfPermission()

到

ActivityCompact.checkSelfPermission()

并更改

ActivityCompat.requestPermissions()

到

requestPermissions()

权限结果的处理（允许或拒绝）与activity相同。

有关更完整的示例，请参阅此

Answer 3

我为此目的使用了这段代码。

   public boolean isPermissionGranted() {

    if (Build.VERSION.SDK_INT >= 23) {
        if (checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE)
                == PackageManager.PERMISSION_GRANTED && checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE)
                == PackageManager.PERMISSION_GRANTED && checkSelfPermission(Manifest.permission.CAMERA)
                == PackageManager.PERMISSION_GRANTED) {
            Log.v(TAG, "Permission is granted");
            return true;
        } else {
            ActivityCompat.requestPermissions(this, new String[]{
                    Manifest.permission.CAMERA
            }, 1);
            return false;
        }
    } else { //permission is automatically granted on sdk<23 upon installation
        Log.v(TAG, "Permission is granted");
        return true;
    }

}

然后您可以致电：

    if(isPermissionGranted())
    {
       // do your stuff
    }

Android 权限：用户按下 "Allow" 后执行任务

Android permissions: Perform task after user pressed "Allow"

android

android-permissions