Question

伙计们我的progressDialog有点问题。它没有以正确的方式工作。我的progressDialog在RecylerView Adapter中，因为我使用Glide加载了许多图片。当我使用Glide时，这是显示progressDialog的唯一方法 - 如果我将progressDialog移动到Asynctask proExecute并且postExecute它只显示doinBackground作业正在执行和隐藏时。但Glide仍在加载图片。正如我写的，我的解决方案是把它放在适配器和隐藏，直到图片加载，工作奇怪。有时当我运行应用程序时，我必须等到pic加载而没有进度转换，有时它会显示很短的时间。怎么解决？在我的情况下使用progressDialog的最佳方法是什么？

我的主要活动：

public class MainActivity extends AppCompatActivity {

    List<String> shopsNames;
    ArrayList<RowModel> rowModels;

    public Realm mRealm;
    @BindView(R.id.toolbar_layout)
    CollapsingToolbarLayout toolbarLayout;
    @BindView(R.id.app_bar)
    AppBarLayout appBar;
    private ShopsAdapter adapter;
    @BindView(R.id.recycler_view)
    RecyclerView recyclerView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_activity);
        ButterKnife.bind(this);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        ConnectionDetector connectionDetector = new ConnectionDetector(this);
        if (!connectionDetector.isConnection()) {
            finish();
        }

        ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION}, 123);



        rowModels = new ArrayList<>();
        shopsNames = new ArrayList<>();
        Realm.init(this);

        mRealm = Realm.getDefaultInstance();

        initCollapsingToolbar();

        Glide.with(getApplicationContext()).load(R.drawable.shoplogo).
                into((ImageView) findViewById(R.id.backdrop));

        adapter = new ShopsAdapter(MainActivity.this, shopsNames);

        RecyclerView.LayoutManager layoutManager = new GridLayoutManager(getApplicationContext(), 2);
        recyclerView.setLayoutManager(layoutManager);
        recyclerView.setItemAnimator(new DefaultItemAnimator());
        recyclerView.setAdapter(adapter);

        AsyncTaskRetro asyncTaskRetro = new AsyncTaskRetro();
        asyncTaskRetro.execute();
    }

    private class AsyncTaskRetro extends AsyncTask<Void, Void, Void> {

        @Override
        protected Void doInBackground(Void... voids) {

            PlacesAPI.Factory.getInstance().getPlaces().enqueue(new Callback<Places>() {

                @Override
                public void onResponse(Call<Places> call, Response<Places> response) {
                    for (int i = 0; i < response.body().getPosts().size(); i++) {
                        RowModel rowModel = new RowModel(response.body().getPosts().get(i).getNazwa(),
                                Double.parseDouble(response.body().getPosts().get(i).getSzer()),
                                Double.parseDouble(response.body().getPosts().get(i).getDlug()));
                        rowModels.add(rowModel);
                    }
                    String oldName;
                    oldName = rowModels.get(0).getName();
                    shopsNames.add(rowModels.get(0).getName());

                    mRealm.beginTransaction();
                    mRealm.copyToRealm(rowModels);
                    mRealm.commitTransaction();

                    for (int j = 0; j < rowModels.size(); j++) {

                        if (rowModels.get(j).getName().equals(oldName)) {
                            continue;
                        }
                        oldName = rowModels.get(j).getName();
                        shopsNames.add(rowModels.get(j).getName());
                    }

                    //sortowanie listy z nazwami sklepow
                    Collections.sort(shopsNames);

                    adapter = new ShopsAdapter(MainActivity.this, shopsNames);
                    recyclerView.setAdapter(adapter);
                }

                @Override
                public void onFailure(Call<Places> call, Throwable t) {

                }
            });

            return null;
        }
    }

    private void initCollapsingToolbar() {
        final CollapsingToolbarLayout collapsingToolbar =
                (CollapsingToolbarLayout) findViewById(R.id.toolbar_layout);
        collapsingToolbar.setTitle(" ");
        AppBarLayout appBarLayout = (AppBarLayout) findViewById(R.id.app_bar);
        appBarLayout.setExpanded(true);

        // hiding & showing the title when toolbar expanded & collapsed
        appBarLayout.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() {
            boolean isShow = false;
            int scrollRange = -1;

            @Override
            public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
                if (scrollRange == -1) {
                    scrollRange = appBarLayout.getTotalScrollRange();
                }
                if (scrollRange + verticalOffset == 0) {
                    collapsingToolbar.setTitle(getString(R.string.app_name));
                    isShow = true;
                } else if (isShow) {
                    collapsingToolbar.setTitle(" ");
                    isShow = false;
                }
            }
        });
    }
}

我的适配器类：

public class ShopsAdapter extends RecyclerView.Adapter<ShopsAdapter.MyViewHolder> {

    Context mContext;
    List<String> shopsList;
    ProgressDialog progressDialog;

    public class MyViewHolder extends RecyclerView.ViewHolder {
        public ImageView thumbnail;

        public MyViewHolder(View view) {
            super(view);
            thumbnail = (ImageView) view.findViewById(R.id.thumbnail);
        }
    }

    public ShopsAdapter(Context mContext, List<String> shopsList) {
        this.mContext = mContext;
        this.shopsList = shopsList;

        progressDialog = new ProgressDialog(mContext);
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.shop_card, parent, false);

        return new MyViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(final MyViewHolder holder, final int position) {

        shopsList.get(position);
        try {
            progressDialog.show();
            progressDialog.setMessage("Czekaj...");
            String stringformat = String.format("http://www.wp.pl%s.png", shopsList.get(position));
            Glide.with(mContext).load(stringformat).listener(new RequestListener<String, GlideDrawable>() {
                @Override
                public boolean onException(Exception e, String model, Target<GlideDrawable> target, boolean isFirstResource) {
                    Log.d("fsfsdf", e.getMessage());
                    return false;
                }

                @Override
                public boolean onResourceReady(GlideDrawable resource, String model, Target<GlideDrawable> target, boolean isFromMemoryCache, boolean isFirstResource) {
                    progressDialog.hide();
                    return false;
                }
            }).centerCrop().fitCenter().into(holder.thumbnail);
        } catch (Exception e) {
            Glide.with(mContext).load("http://www.wp.pl/Zabka.png").centerCrop().fitCenter().into(holder.thumbnail);
        }

        holder.thumbnail.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                //Log.d("Nazwa sklepu: ", shopsList.get(position));
                Intent intent = new Intent(mContext, MapActivity.class);
                intent.putExtra("shopName", shopsList.get(position));
                mContext.startActivity(intent);
            }
        });
    }

    @Override
    public int getItemCount() {
        return shopsList.size();
    }
}

Answer 1

最简单的方法是在imageview后面显示进度条。将ImageView和ProgressBar添加到RelativeLayout。当图像被加载时，它将自动隐藏进度条。捷径：D

 <RelativeLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <ProgressBar
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true" />

    <ImageView
        android:layout_width="200dp"
        android:layout_height="200dp" />
</RelativeLayout>

只需加载图片，不要对进度条做任何事情。

Asynctask和RecyclerView Adapter中的Android ProgressDialog

1 个答案: