java 我的方法在onKeyEntered中不起作用

f87krz0w  于 2022-12-02  发布在  Java
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我正在尝试创建一个应用程序,允许用户租用离他们最近的汽车。我想构建一个带有textView和imageView的cardView。一旦我找到了最近的汽车,我就创建了方法buildCardView来实现这一点。我的问题是,当调用cardView时,它没有被创建。当我直接调用它时,buildCardView工作正常。但在Geocerquery onKeyEntered方法内部调用时却不是这样。我调试了代码,在onKeyEntered方法内部调用了buildCardView方法,但cardView是不可见的。下面是调用firebase方法的代码。

FindCar.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
                   findClosestCars();
        }
    });

下面是调用buildCardView的firebase方法

private void findClosestCars() {
    if (ActivityCompat.checkSelfPermission(RentersMenuPageActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {

     //  turnOnLocationUpdates();
        //fusedLocationClient.requestLocationUpdates(mLocationRequest, locationCallback, Looper.myLooper());

        databaseReference = FirebaseDatabase.getInstance().getReference("Users").child("Lenders");
        GeoFire geoFire = new GeoFire(databaseReference);
        GeoQuery geoQuery = geoFire.queryAtLocation(new GeoLocation(latitude, longitude), radius);
        geoQuery.removeAllListeners();

        geoQuery.addGeoQueryEventListener(new GeoQueryEventListener() {
            @Override
            public void onKeyEntered(String key, GeoLocation location) {
           //
                //  Toast.makeText(RentersMenuPageActivity.this, "You Found a Lender",Toast.LENGTH_LONG);
                  //      Toast.LENGTH_LONG).show();

                //showPictureAndPrice();

                if (!driverFound) {
                    driverFound = true;
                    driverFoundID = key;

                    closestLender = FirebaseDatabase.getInstance().getReference("Users").child("Lenders").child(driverFoundID);

                    String [] lenderLocations;

                    buildCardView();
                }

               radius++;
            }

下面是buildCardView,它在主视图中扩大了一个较小的视图(直接调用时有效,但从onkeyentered调用时无效)

private void buildCardView(){
    Toast.makeText(RentersMenuPageActivity.this, "You Found a Lender",Toast.LENGTH_LONG).show();

    LayoutInflater mInflater = (LayoutInflater) getSystemService(Activity.LAYOUT_INFLATER_SERVICE);

    View view =getLayoutInflater().inflate(R.layout.card,null);

   // CardView cardView = view.findViewById(R.id.cardView);
    Button rentCarButton = view.findViewById(R.id.rentCarButton);
    TextView price= view.findViewById(R.id.price);
    TextView makeandmodel = view.findViewById(R.id.makeandmodel);
    ImageView imageView =view.findViewById(R.id.imageViewScroll);

    LinearLayout.LayoutParams p = new LinearLayout.LayoutParams(
            LinearLayout.LayoutParams.WRAP_CONTENT,
            LinearLayout.LayoutParams.WRAP_CONTENT);
    linearLayout.addView(view);
}
tpgth1q7

tpgth1q71#

onKeyEntered方法是在与主线程不同的线程中调用的,因此您在该方法中对UI所做的任何更改都将不可见。
若要解决此问题,您需要更新主线程上的UI。您可以使用runOnUiThread方法来完成此操作

private void buildCardView(){
    runOnUiThread(new Runnable() {
        public void run() {
            ...

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