EndlessAdapter不与Android的CWAC-EndlessAdapter更新更新

本文介绍了EndlessAdapter不与Android的CWAC-EndlessAdapter更新更新的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有一个艰难的时间用于了解

我试图通过以下这些Commonsware快速步骤无济于事：How我可以使用自定义适配器与CWAC，无尽的适配器？

I have three java classes. My activity, my regular adapter (that works before I tried to integrate endless adapter), and I have a subclassed endless adapter. I'm sure I'm just doing something small that is making this not trigger properly. My app does NOT crash, and it SHOWS my "Loading" view, it just never updates, and seems to load a lot of stuff afterwards because the gui really slows down. I'm probably stuck in some kind of loop. Any ideas?

My main activity:

package com.eghdk.myapp.gui;

import java.util.ArrayList;

import android.annotation.TargetApi;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.NavUtils;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ListView;

import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.koushikdutta.async.future.FutureCallback;
import com.koushikdutta.ion.Ion;
import com.eghdk.myapp.R;
import com.eghdk.myapp.adapters.MyAdapter;
import com.eghdk.myapp.adapters.MyEndlessAdapter;
import com.eghdk.myapp.util.AppUtil;

public class MyBlog extends ListActivity {
    String content;
    String Url;
    String title;
    ArrayList<String> titles;
    ArrayList<String> urls;
    ArrayList<String> contents;

    MyAdapter adapter;
    int page = 1;
    int count = 20;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my_blog);
        // Show the Up button in the action bar.
        setupActionBar();

        titles = new ArrayList<String>();
        urls = new ArrayList<String>();
        contents = new ArrayList<String>();

        adapter = new MyAdapter(this, titles);

        loadDataFromWeb(page, count);

        }
    }

    /**
     * Set up the {@link android.app.ActionBar}, if the API is available.
     */
    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    private void setupActionBar() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            getActionBar().setDisplayHomeAsUpEnabled(true);
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_my_blog, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case android.R.id.home:
            // This ID represents the Home or Up button. In the case of this
            // activity, the Up button is shown. Use NavUtils to allow users
            // to navigate up one level in the application structure. For
            // more details, see the Navigation pattern on Android Design:
            //
            // http://developer.android.com/design/patterns/navigation.html#up-vs-back
            //
            NavUtils.navigateUpFromSameTask(this);
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    public void loadDataFromWeb(int page, int count) {
//I'm using Koushs Ion library to do Async Json calls.
        Ion.with(
                MyBlog.this,
                "http://myblog.com/api/get_posts/?page=" + page + "&count="
                        + count).asJsonObject()
                .setCallback(new FutureCallback<JsonObject>() {
                    @Override
                    public void onCompleted(Exception e, JsonObject result) {

                        String status = result.getAsJsonPrimitive("status")
                                .getAsString();

                        if (!status.equals("ok")) {
                            Log.e("TAG", "api doesn't exist");
                            Log.e("TAG", "api doesn't");

                        }

                        JsonArray jsonPostArray = result
                                .getAsJsonArray("posts");

                        for (JsonElement jsonElementPost : jsonPostArray) {

                            JsonObject jsonPost = jsonElementPost
                                    .getAsJsonObject();
                            int ID = jsonPost.get("id").getAsInt();
                            title = jsonPost.get("title").getAsString();
                            titles.add(title);
                            content = jsonPost.get("content").getAsString();
                            contents.add(content);


                                at = jsonPost.getAsJsonArray("attachments")
                                        .get(0).getAsJsonObject();
                                Url = at.get("url").getAsString();
                                urls.add(Url);

                        }

                        // Log.d("TAG", ID + "");
                        done();
                    }
                });

    }

    private void done() {
        MyEndlessAdapter endless = new MyEndlessAdapter(adapter, this);
        setListAdapter(endless);
    }

}

MyAdapter.java:

package com.eghdk.myapp.adapters;

import java.util.ArrayList;

import android.R;
import android.content.Context;
import android.text.Html;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

public class MyAdapter extends BaseAdapter {
    ArrayList<String> titles;
    Context context;
    LayoutInflater mInflater;

    public MyAdapter(Context context, ArrayList<String> list) {
        titles = list;
        this.context = context;
        mInflater = LayoutInflater.from(context);
    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return titles.size();
    }

    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        if (convertView == null) {
            convertView = mInflater.inflate(
                    android.R.layout.simple_list_item_1, parent, false);
        }
        ((TextView) convertView.findViewById(R.id.text1)).setText(Html
                .fromHtml(titles.get(position)));
        return convertView;
    }

}

EndlessAdapter:

package com.eghdk.myapp.adapters;

import java.util.ArrayList;

import android.content.Context;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListAdapter;
import android.widget.TextView;

import com.commonsware.cwac.endless.EndlessAdapter;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.koushikdutta.async.future.FutureCallback;
import com.koushikdutta.ion.Ion;

public class MyEndlessAdapter extends EndlessAdapter { ArrayList tempList = new ArrayList(); protected String title; protected ArrayList titles; protected String content; protected String atUrl; ArrayAdapter oldadapter; int page = 1, count = 20; Context context;

public MyEndlessAdapter(ListAdapter wrapped, Context ctx) {
    super(wrapped);
    context = ctx;
    titles = new ArrayList<String>();
    oldadapter = (ArrayAdapter) wrapped;

    // TODO Auto-generated constructor stub
}

@Override
protected void appendCachedData() {
    // TODO Auto-generated method stub
    oldadapter.addAll(titles);

}

    @Override
    protected View getPendingView(ViewGroup parent) {
        // TODO Auto-generated method stub
        TextView view = new TextView(context);
        view.setText("LOADING");
        return view;
    }

    @Override
    protected boolean cacheInBackground() throws Exception {
        Ion.with(
                context,
                "http://myblog.com/api/get_posts/?page=" + page + "&count="
                        + count).asJsonObject()
                .setCallback(new FutureCallback<JsonObject>() {
                    @Override
                    public void onCompleted(Exception e, JsonObject result) {
                        if (result == null) {
                            Log.e("TAG", "server crash");
                            Log.e("TAG", " crash");
                        }

                        String status = result.getAsJsonPrimitive("status")
                                .getAsString();

                        if (!status.equals("ok")) {
                            Log.e("TAG", "api doesn't exist");
                            Log.e("TAG", "api doesn't");

                        } else {

                        }

                        JsonArray jsonPostArray = result
                                .getAsJsonArray("posts");
                        int i = 0;
                        for (JsonElement jsonElementPost : jsonPostArray) {
                            Log.d("", i + "");
                            i++;
                            JsonObject jsonPost = jsonElementPost
                                    .getAsJsonObject();
                            int ID = jsonPost.get("id").getAsInt();
                            String url = jsonPost.get("url").getAsString();
                            title = jsonPost.get("title").getAsString();
                            titles.add(title);
                            content = jsonPost.get("content").getAsString();

                            String date = jsonPost.get("date").getAsString();

                            try {
                                JsonObject cat = jsonPost
                                        .getAsJsonArray("categories").get(0)
                                        .getAsJsonObject();
                                String catTitle = cat.get("title")
                                        .getAsString();
                            } catch (Exception e2) {
                                // TODO Auto-generated catch block
                                e2.printStackTrace();
                            }

                            JsonObject author = jsonPost
                                    .getAsJsonObject("author");
                            String name = author.get("name").getAsString();
                            JsonObject at = null;
                            try {
                                at = jsonPost.getAsJsonArray("attachments")
                                        .get(0).getAsJsonObject();
                                atUrl = at.get("url").getAsString();
                                String atMime = at.get("mime_type")
                                        .getAsString();

                            } catch (Exception e1) {
                                // TODO Auto-generated catch block
                                e1.printStackTrace();
                                atUrl = "";

                            }

                        }

                        // Log.d("TAG", ID + "");
                        // done();
                    }
                });
        return true;
    }

}

解决方案

Let's review the major headings of the "Usage" section of the documentation:

Constructors: you are calling the constructor on your EndlessAdapter subclass
Placeholder: you have implemented getPendingView() on your EndlessAdapter subclass
The Loading: you have implemented cacheInBackground() on your EndlessAdapter subclass, and while your implementation is strange (three ArrayList<String> rather than one ArrayList<WhateverYourActualModelObjectShouldBe>?), it probably works
The Attaching: BZZZT -- your appendCachedData() does not do anything
The Threading: your code should be fine, so long as you are not trying to use other AsyncTasks at the same time, or if your android:targetSdkVersion is under 13
The Overriding: your code should be fine

So, I would recommend that you go back to The Attaching, read through that section, and peek at the demo app's implementation. Yours may be more complicated, as you chose to use BaseAdapter rather than ArrayAdapter, despite your data model being an array.

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