Glide：如何停止从缓存加载图像而不是每次从服务器加载

Question

我尝试了一切可能，但是无法在我的json更新时弄清楚如何更新图像以滑动

我的Android应用程序首次使用滑动来加载json中的图像，之后它只加载来自缓存的图像。它不会加载在服务器上更新的图像，直到我删除应用程序并重新安装它

我尝试使用 diskCacheStrategy（DiskCacheStrategy.NONE）和 .skipMemoryCache（true）但没有发生任何事情

Glide.with(mContext).load(image.getMedium())
                .thumbnail(0.5f)
                .crossFade()
                .diskCacheStrategy(DiskCacheStrategy.NONE)
                .skipMemoryCache(true)
                .into(holder.thumbnail);

这是我的代码GalleryAdapter.java

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.GestureDetector;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

import com.bumptech.glide.Glide;
import com.bumptech.glide.load.engine.DiskCacheStrategy;

import java.util.List;

import com.bumptech.glide.signature.StringSignature;
import com.dailysolutions.sn.R;
import com.dailysolutions.sn.model.Image;

/**
 * Created by Sagunesh on 31/03/16.
 */

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

    private List<Image> images;
    private Context mContext;

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

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


    public GalleryAdapter(Context context, List<Image> images) {
        mContext = context;
        this.images = images;
    }

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

        return new MyViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {
        Image image = images.get(position);

        Glide.with(mContext).load(image.getMedium())
                .thumbnail(0.5f)
                .crossFade()
                .diskCacheStrategy(DiskCacheStrategy.NONE)
                .skipMemoryCache(true)
                .into(holder.thumbnail);

    }

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

    public interface ClickListener {
        void onClick(View view, int position);

        void onLongClick(View view, int position);
    }

    public static class RecyclerTouchListener implements RecyclerView.OnItemTouchListener {

        private GestureDetector gestureDetector;
        private GalleryAdapter.ClickListener clickListener;

        public RecyclerTouchListener(Context context, final RecyclerView recyclerView, final GalleryAdapter.ClickListener clickListener) {
            this.clickListener = clickListener;
            gestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
                @Override
                public boolean onSingleTapUp(MotionEvent e) {
                    return true;
                }

                @Override
                public void onLongPress(MotionEvent e) {
                    View child = recyclerView.findChildViewUnder(e.getX(), e.getY());
                    if (child != null && clickListener != null) {
                        clickListener.onLongClick(child, recyclerView.getChildPosition(child));
                    }
                }
            });
        }

        @Override
        public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {

            View child = rv.findChildViewUnder(e.getX(), e.getY());
            if (child != null && clickListener != null && gestureDetector.onTouchEvent(e)) {
                clickListener.onClick(child, rv.getChildPosition(child));
            }
            return false;
        }

        @Override
        public void onTouchEvent(RecyclerView rv, MotionEvent e) {
        }

        @Override
        public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {

        }
    }
}

以下是MainActivity.java的代码

import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.support.design.widget.NavigationView;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.MenuItem;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.bumptech.glide.Glide;
import com.dailysolutions.sn.R;
import com.dailysolutions.sn.adapter.GalleryAdapter;
import com.google.android.gms.ads.AdListener;
import com.google.android.gms.ads.AdView;

import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.design.widget.NavigationView;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;

import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonArrayRequest;
import com.google.android.gms.ads.AdRequest;


import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;

import com.dailysolutions.sn.app.AppController;
import com.dailysolutions.sn.model.Image;
import com.google.android.gms.ads.InterstitialAd;

import java.util.ArrayList;

public class MainActivity extends BaseActivity {
    private DrawerLayout drawerLayout;
    private Toolbar toolbar;



    private String TAG = MainActivity.class.getSimpleName();
    private static final String endpoint = "https://www.freesabkuch.com/api_mehndi/glide.json";
    private ArrayList<Image> images;
    private ProgressDialog pDialog;
    private GalleryAdapter mAdapter;
    private RecyclerView recyclerView;
    private AdView mAdView;
    InterstitialAd interstitial;

    // Our created menu to use
    private Menu mymenu;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        initNavigationDrawer();
        checkConnectivity();

        //advertisement
        mAdView = (AdView) findViewById(R.id.adView);
        AdRequest adRequest = new AdRequest.Builder()
                .build();
        mAdView.loadAd(adRequest);

        // Prepare the Interstitial Ad
        interstitial = new InterstitialAd(MainActivity.this);
// Insert the Ad Unit ID
        interstitial.setAdUnitId(getString(R.string.admob_interstitial_id));

        interstitial.loadAd(adRequest);
// Prepare an Interstitial Ad Listener
        interstitial.setAdListener(new AdListener() {
            public void onAdLoaded() {
                // Call displayInterstitial() function
                displayInterstitial();
            }
        });

        recyclerView = (RecyclerView) findViewById(R.id.recycler_view);

        pDialog = new ProgressDialog(this);
        images = new ArrayList<>();
        mAdapter = new GalleryAdapter(getApplicationContext(), images);

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

        recyclerView.addOnItemTouchListener(new GalleryAdapter.RecyclerTouchListener(getApplicationContext(), recyclerView, new GalleryAdapter.ClickListener() {
            @Override
            public void onClick(View view, int position) {
                Bundle bundle = new Bundle();
                bundle.putSerializable("images", images);
                bundle.putInt("position", position);

                FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
                SlideshowDialogFragment newFragment = SlideshowDialogFragment.newInstance();
                newFragment.setArguments(bundle);
                newFragment.show(ft, "slideshow");
            }

            @Override
            public void onLongClick(View view, int position) {

            }
        }));

        fetchImages();




    }

    public void displayInterstitial() {
// If Ads are loaded, show Interstitial else show nothing.
        if (interstitial.isLoaded()) {
            interstitial.show();
        }
    }
    @Override
    public void onResume() {
        // Start or resume the game.
        super.onResume();
        displayInterstitial();
    }
    @Override
    public void onStart() {
        super.onStart();
        displayInterstitial();
    }
    private void fetchImages() {

        pDialog.setMessage("Downloading....");
        pDialog.show();

        JsonArrayRequest req = new JsonArrayRequest(endpoint,
                new Response.Listener<JSONArray>() {
                    @Override
                    public void onResponse(JSONArray response) {
                        Log.d(TAG, response.toString());
                        pDialog.hide();

                        images.clear();
                        for (int i = 0; i < response.length(); i++) {
                            try {
                                JSONObject object = response.getJSONObject(i);
                                Image image = new Image();
                                image.setName(object.getString("name"));

                                JSONObject url = object.getJSONObject("url");
                                image.setSmall(url.getString("small"));
                                image.setMedium(url.getString("medium"));
                                image.setLarge(url.getString("large"));
                                image.setTimestamp(object.getString("timestamp"));

                                images.add(image);

                            } catch (JSONException e) {
                                Log.e(TAG, "Json parsing error: " + e.getMessage());
                            }
                        }

                        mAdapter.notifyDataSetChanged();
                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Log.e(TAG, "Error: " + error.getMessage());
                pDialog.hide();
            }
        });

        // Adding request to request queue
        AppController.getInstance().addToRequestQueue(req);
    }



    @Override
    public void onBackPressed() {
        exit();
    }


    public void initNavigationDrawer() {

        NavigationView navigationView = (NavigationView)findViewById(R.id.navigation_view);
        navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(MenuItem menuItem) {

                int id = menuItem.getItemId();

                switch (id){
                    case R.id.home:
                        Toast.makeText(getApplicationContext(),"Home",Toast.LENGTH_SHORT).show();
                        drawerLayout.closeDrawers();
                        break;
                    case R.id.share:
                        Toast.makeText(getApplicationContext(),"Share",Toast.LENGTH_SHORT).show();
                        drawerLayout.closeDrawers();
                        try {
                            Intent i = new Intent(Intent.ACTION_SEND);
                            i.setType("text/plain");
                            i.putExtra(Intent.EXTRA_SUBJECT, "My application name");
                            String sAux = "\nLet me recommend you this application\n\n";
                            sAux = sAux + "https://play.google.com/store/apps/details?id=Orion.Soft \n\n";
                            i.putExtra(Intent.EXTRA_TEXT, sAux);
                            startActivity(Intent.createChooser(i, "choose one"));
                        } catch(Exception e) {
                            //e.toString();
                        }
                    case R.id.trash:
                        Toast.makeText(getApplicationContext(),"Drawer Closed",Toast.LENGTH_SHORT).show();
                        drawerLayout.closeDrawers();
                        break;
                    case R.id.logout:
                       exit();

                }
                return true;
            }
        });
        View header = navigationView.getHeaderView(0);
        TextView tv_email = (TextView)header.findViewById(R.id.tv_email);
        tv_email.setText("Daily Solutions");
        drawerLayout = (DrawerLayout)findViewById(R.id.drawer);

        ActionBarDrawerToggle actionBarDrawerToggle = new ActionBarDrawerToggle(this,drawerLayout,toolbar,R.string.drawer_open,R.string.drawer_close){

            @Override
            public void onDrawerClosed(View v){
                super.onDrawerClosed(v);
            }

            @Override
            public void onDrawerOpened(View v) {
                super.onDrawerOpened(v);
            }
        };
        drawerLayout.addDrawerListener(actionBarDrawerToggle);
        actionBarDrawerToggle.syncState();
    }
    private void checkConnectivity(){
        if(ConnectionHelper.isConnectedOrConnecting(getApplicationContext())) {
            hideErrorsBar(true);

        }else {
            //hideErrorsBar(false);
            Intent Intent = new Intent(MainActivity.this,NoInternet.class);
            startActivity(Intent);
            finish();
        }
    }



    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Add our menu
        getMenuInflater().inflate(R.menu.menu_main, menu);

        // We should save our menu so we can use it to reset our updater.
        mymenu = menu;

        //
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch(item.getItemId()) {
            case R.id.action_refresh:
                // Do animation start
                LayoutInflater inflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                ImageView iv = (ImageView)inflater.inflate(R.layout.iv_refresh, null);
                Animation rotation = AnimationUtils.loadAnimation(this, R.anim.rotate_refresh);
                rotation.setRepeatCount(Animation.INFINITE);
                iv.startAnimation(rotation);
                item.setActionView(iv);
                new UpdateTask(this).execute();
                return true;
        }
        return super.onOptionsItemSelected(item);
    }


    public void resetUpdating()
    {
        // Get our refresh item from the menu
        MenuItem m = mymenu.findItem(R.id.action_refresh);
        if(m.getActionView()!=null)
        {
            // Remove the animation.
            m.getActionView().clearAnimation();
            m.setActionView(null);
        }
    }



}

Answer 1

您可以使用Signature使缓存无效并从网络加载图像。试试

Glide.with(Fragment/context)
.load(imagePath)
.signature(new StringSignature(yourVersion))
.into(ImageView);

只需将new StringSignature(System.currentTimeMillis()+"")传递给签名，以便每次都从网络加载图片

Answer 2

你也可以尝试设置Signatures 根据缓存的滑行文档

试试这个

    Glide.with(context)
   .load(url) .
    signature(new StringSignature(System.currentTimeMillis()))
 .into(imageView);

查看here了解详情

Answer 3

每个人都非常感谢你们的帮助：）

我通过禁用导致问题的排球库缓存解决了这个问题，但无论如何都要感谢您的帮助：）

//disabling caching for url
        AppController.getInstance().getRequestQueue().getCache().remove(url);