[英]How can i refresh this app with SwipeRefreshLayout?
I'm following a tutorial of how to make a gallery in 我正在关注如何制作画廊的教程 android-studio and I want to use SwipeRefreshLayout
to update the images but really I don't know how. android-studio和我想使用SwipeRefreshLayout
更新图像,但实际上我不知道如何。 Here's the code how can i solve it? 这是代码,我该如何解决?
MainActivity.java
package info.androidhive.glide.activity;
import android.app.ProgressDialog;
import android.os.Bundle;
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 com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonArrayRequest;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import info.androidhive.glide.R;
import info.androidhive.glide.adapter.GalleryAdapter;
import info.androidhive.glide.app.AppController;
import info.androidhive.glide.model.Image;
public class MainActivity extends AppCompatActivity {
private String TAG = MainActivity.class.getSimpleName();
private static final String endpoint = "http://url.com/examp.php";
private ArrayList<Image> images;
private ProgressDialog pDialog;
private GalleryAdapter mAdapter;
private RecyclerView recyclerView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
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();
}
private void fetchImages() {
pDialog.setMessage("Downloading json...");
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);
}
}
and heres the activity_main.xml 这是activity_main.xml
Activity_main.xml
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<include layout="@layout/content_main" />
</android.support.design.widget.CoordinatorLayout>
Here is a very nice example explained for how to Swipe to Refresh 这是一个很好的示例,说明了如何滑动刷新
You have to wrap the whole xml in android.support.v4.widget.SwipeRefreshLayout
. 您必须将整个xml包装在android.support.v4.widget.SwipeRefreshLayout
。 Initialize the SwipeRefreshLayout
in onCreate
, add a listener for it and inside its method: onRefresh()
you call your method: fetchImages();
在onCreate
初始化SwipeRefreshLayout
, SwipeRefreshLayout
添加一个侦听器,并在其方法内: onRefresh()
调用您的方法: fetchImages();
Don't forget to use yourSwipeLayoutName.setRefreshing(false);
不要忘记使用yourSwipeLayoutName.setRefreshing(false);
in your method one the network request has ended so the refresh knows when to stop. 在您的方法中,网络请求已结束,因此刷新知道何时停止。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.