用户 Android M 在应用中授予的权限

Question

我想在我的应用程序中。如果permission已经授予不在dialogandroid中显示这是我的代码

@Override
public void onClick(View v) {
    switch (v.getId()){
        case R.id.button:
                requestContactsPermissions();
            break;
        case R.id.button1:
          //  requestCameraPermissions();
            Toast.makeText(mcontext, "Hello", Toast.LENGTH_LONG).show();
            break;
    }

}

private void requestContactsPermissions() {

     boolean requestPermission = PersimissionTest.requestContactsPermissions(this);

    if (requestPermission == true) {
        ActivityCompat.requestPermissions(this, PERMISSIONS_CONTACTS, REQUEST_ID);

    } else {
       ActivityCompat.requestPermissions(this, PERMISSIONS_CONTACTS, REQUEST_ID);

    }

}

@Override public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {

    if (requestCode == REQUEST_ID) {

        if (PersimissionTest.verifyPermissions(grantResults)) {

            Toast.makeText(mcontext, "Contacts permissions granted.", Toast.LENGTH_LONG).show();

        } else {
            Toast.makeText(mcontext, "Contacts permissions were not granted.", Toast.LENGTH_LONG).show();
        }

    } else {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    }
}

Answer 1

以下代码检查应用程序是否具有读取用户联系人的权限，并在必要时请求权限：

// Here, thisActivity is the current activity
if (ContextCompat.checkSelfPermission(thisActivity,
            Manifest.permission.READ_CONTACTS)
    != PackageManager.PERMISSION_GRANTED) {

    // Should we show an explanation?
    if (ActivityCompat.shouldShowRequestPermissionRationale(thisActivity,
        Manifest.permission.READ_CONTACTS)) {

        // Show an expanation 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(thisActivity,
            new String[]{Manifest.permission.READ_CONTACTS},
            MY_PERMISSIONS_REQUEST_READ_CONTACTS);

        // MY_PERMISSIONS_REQUEST_READ_CONTACTS is an
        // app-defined int constant. The callback method gets the
        // result of the request.
    }
}
else
{
    // Permission already granted ... This is where you can continue your further business logic...
}

以下是回调方法：

@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
    }
}

有关详细说明，请访问此处（Android 官方页面）或此处（Tutsplus 教程）：