基類抽取http服務(網路判斷)資料庫多條目載入上拉載入下拉重新整理
阿新 • • 發佈：2018-12-10
//BaseActivity
public abstract class BaseActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(initLayout());
initview();
getNews();
}
/**
* 設定佈局檔案
*/
protected abstract int initLayout();
/**
* 初始化控制元件
*/
protected abstract void initview();
/**
* 獲得資料
*/
protected abstract void getNews();
}
//主頁面
public class MainActivity extends BaseActivity implements View.OnClickListener {
private DrawerLayout dra_layout;
private Button btn_1,btn_2,btn_3;
private ArrayList<Fragment> fragment;
private ViewPager view_pager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//設定監聽
view_pager.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {
@Override
public Fragment getItem(int i) {
return fragment.get(i);
}
@Override
public int getCount() {
return fragment.size();
}
});
btn_1.setOnClickListener(this);
btn_2.setOnClickListener(this);
btn_3.setOnClickListener(this);
}
@Override
protected int initLayout() {
return R.layout.activity_main;
}
@Override
protected void initview() {
//初始化控制元件
dra_layout = findViewById(R.id.drawer_layout);
view_pager = findViewById(R.id.view_pager);
btn_1 = findViewById(R.id.btn_1);
btn_2 = findViewById(R.id.btn_2);
btn_3 = findViewById(R.id.btn_3);
//建立集合
fragment = new ArrayList<>();
fragment.add(new OneFragment());
fragment.add(new TwoFragment());
fragment.add(new ThreeFragment());
}
@Override
protected void getNews() {
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.btn_1:
view_pager.setCurrentItem(0);
break;
case R.id.btn_2:
view_pager.setCurrentItem(1);
break;
case R.id.btn_3:
view_pager.setCurrentItem(2);
break;
}
}
}
//碎片
public abstract class BaseFragment extends Fragment {
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
initView(view);
getDatas();
}
abstract void initView(View view);
abstract void getDatas();
}public class OneFragment extends BaseFragment {
private static final String TAG = "ConcernFragment";
public static final String NEWS_URL="http://www.xieast.com/api/news/news.php?page=";
private int page=1;
private boolean isLoadMore= false;
private XListView list_view;
private ArrayList<News.DataBean> list;
private MyAdapter adapter;
private NewsDao dao;
private static final int FLAG = 123;
private Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case FLAG:
String result = (String) msg.obj;
Gson gson = new Gson();
News news = gson.fromJson(result, News.class);
if (news != null) {
ArrayList<News.DataBean> data = (ArrayList<News.DataBean>) news.getData();
if (data != null) {
// 新增到資料庫中
int i = dao.insert(data);
if (i > 0) {
Log.i(TAG, "插入了: " + i + "條資料");
}
if (!isLoadMore) {
list.clear();
}
list.addAll(data);
adapter.notifyDataSetChanged();
}
}
postDelayed(new Runnable() {
@Override
public void run() {
list_view.stopRefresh();
}
}, 2000);
break;
}
}
};
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view= inflater.inflate(R.layout.fragment_one, container, false);
return view;
}
@Override
void initView(View view) {
//初始化控制元件
list_view=view.findViewById(R.id.list_view);
//建立集合
list=new ArrayList<>();
//建立介面卡
adapter=new MyAdapter(list,getActivity());
list_view.setAdapter(adapter);
dao=new NewsDao(getActivity());
//設定上拉載入下拉重新整理
list_view.setPullLoadEnable(true);
list_view.setPullRefreshEnable(true);
//設定Xlistview監聽事件
list_view.setXListViewListener(new XListView.IXListViewListener() {
@Override
public void onRefresh() {
if (page>1){
page--;
}else {
Toast.makeText(getActivity(),"給不了親更多資訊了!!!",Toast.LENGTH_LONG).show();
}
isLoadMore=false;
getDatas();
handler.postDelayed(new Runnable() {
@Override
public void run() {
list_view.stopRefresh();
}
},1000);
long l = System.currentTimeMillis();
Date date = new Date(l);
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm");
list_view.setRefreshTime(format.format(date));
}
@Override
public void onLoadMore() {
page ++;
isLoadMore = true;
getDatas();
News news = new News();
ArrayList<News.DataBean> result = (ArrayList<News.DataBean>) news.getData();
if (result == null){
Toast.makeText(getActivity(),"沒有更多的資料了",Toast.LENGTH_SHORT).show();
}
handler.postDelayed(new Runnable() {
@Override
public void run() {
list_view.stopLoadMore();
}
},1000);
}
});
}
@Override
void getDatas() {
if (NetworkConnected.isNetworkConnected(getActivity())){
getDataFromHttp();
}else {
getDataFromDB();
}
}
//開啟執行緒請求資料
private void getDataFromHttp() {
new AsyncTask<String,Integer,String>(){
@Override
protected String doInBackground(String... strings) {
String s = HttpUtils.getHttpUrlConnection(strings[0]);
Message msg = Message.obtain();
msg.what = FLAG;
msg.obj = s;
handler.sendMessage(msg);
return s;
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
Gson gson = new Gson();
News news = gson.fromJson(s, News.class);
if (news != null){
ArrayList<News.DataBean> result = (ArrayList<News.DataBean>) news.getData();
if (result != null){
if (!isLoadMore){
list.clear();
}
list.addAll(result);
adapter.notifyDataSetChanged();
}
}
}
}.execute(NEWS_URL+page);
}
//從資料庫獲得資料
public void getDataFromDB(){
ArrayList<News.DataBean> dataBeans = dao.queryPage(page);
if (dataBeans != null) {
if (!isLoadMore) {
list.clear();
}
list.addAll(dataBeans);
adapter.notifyDataSetChanged();
}
handler.postDelayed(new Runnable() {
@Override
public void run() {
list_view.stopRefresh();
}
}, 2000);
}
}
//介面卡
public class MyAdapter extends BaseAdapter {
private static final int TYPE_ONE_PIC = 0;
private static final int TYPE_TWO_PIC = 1;
private static final int TYPE_THREE_PIC = 2;
private ArrayList<News.DataBean> list;
private Context context;
public MyAdapter(ArrayList<News.DataBean> list, Context context) {
this.list = list;
this.context = context;
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int position) {
return list.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public int getViewTypeCount() {
return 3;
}
@Override
public int getItemViewType(int position) {
News.DataBean bean = list.get(position);
if (!TextUtils.isEmpty(bean.getThumbnail_pic_s03())) {
return TYPE_THREE_PIC;
} else if (!TextUtils.isEmpty(bean.getThumbnail_pic_s02())) {
return TYPE_TWO_PIC;
} else {
return TYPE_ONE_PIC;
}
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder1 holder1 = null;
ViewHolder2 holder2 = null;
ViewHolder3 holder3 = null;
int type = getItemViewType(position);
switch (type) {
case TYPE_ONE_PIC:
if (convertView == null) {
holder1 = new ViewHolder1();
convertView = View.inflate(context, R.layout.item_news_01, null);
holder1.txtTitle = convertView.findViewById(R.id.txt_title);
holder1.imgLogo1 = convertView.findViewById(R.id.img_logo_01);
convertView.setTag(holder1);
} else {
holder1 = (ViewHolder1) convertView.getTag();
}
holder1.txtTitle.setText(list.get(position).getTitle());
ImageLoader.getInstance().displayImage(list.get(position).getThumbnail_pic_s(),
holder1.imgLogo1);
break;
case TYPE_TWO_PIC:
if (convertView == null) {
holder2 = new ViewHolder2();
convertView = View.inflate(context, R.layout.item_news_02, null);
holder2.txtTitle = convertView.findViewById(R.id.txt_title);
holder2.imgLogo1 = convertView.findViewById(R.id.img_logo_01);
holder2.imgLogo2 = convertView.findViewById(R.id.img_logo_02);
convertView.setTag(holder2);
} else {
holder2 = (ViewHolder2) convertView.getTag();
}
holder2.txtTitle.setText(list.get(position).getTitle());
ImageLoader.getInstance().displayImage(list.get(position).getThumbnail_pic_s(),
holder2.imgLogo1);
ImageLoader.getInstance().displayImage(list.get(position).getThumbnail_pic_s02(),
holder2.imgLogo2);
break;
case TYPE_THREE_PIC:
if (convertView == null) {
holder3 = new ViewHolder3();
convertView = View.inflate(context, R.layout.item_news_03, null);
holder3.txtTitle = convertView.findViewById(R.id.txt_title);
holder3.imgLogo1 = convertView.findViewById(R.id.img_logo_01);
holder3.imgLogo2 = convertView.findViewById(R.id.img_logo_02);
holder3.imgLogo3 = convertView.findViewById(R.id.img_logo_03);
convertView.setTag(holder3);
} else {
holder3 = (ViewHolder3) convertView.getTag();
}
holder3.txtTitle.setText(list.get(position).getTitle());
ImageLoader.getInstance().displayImage(list.get(position).getThumbnail_pic_s(),
holder3.imgLogo1);
ImageLoader.getInstance().displayImage(list.get(position).getThumbnail_pic_s02(),
holder3.imgLogo2);
ImageLoader.getInstance().displayImage(list.get(position).getThumbnail_pic_s03(),
holder3.imgLogo3);
break;
}
return convertView;
}
class ViewHolder1 {
TextView txtTitle;
ImageView imgLogo1;
}
class ViewHolder2 {
TextView txtTitle;
ImageView imgLogo1;
ImageView imgLogo2;
}
class ViewHolder3 {
TextView txtTitle;
ImageView imgLogo1;
ImageView imgLogo2;
ImageView imgLogo3;
}
}
//http工具類 網路判斷
public class HttpUtils {
public static String getHttpUrlConnection(String urlString){
String result = "";
try {
URL url = new URL(urlString);
//連線
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
//優化
//請求型別
connection.setRequestMethod("GET");
connection.setDoInput(true);
connection.setDoOutput(false);
connection.setUseCaches(false);
//超時時間
connection.setConnectTimeout(3000);
connection.connect();
//獲取狀態碼 200 成功
if(connection.getResponseCode() == 200){
InputStream is = connection.getInputStream();
result = getInputStream(is);
}
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
private static String getInputStream(InputStream is) {
String result = "";
try {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
int count = -1;
byte[] buffer = new byte[1024];
while ((count = is.read(buffer,0,buffer.length)) != -1){
baos.write(buffer,0,count);
baos.flush();
}
result = baos.toString();
baos.close();
is.close();
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
}
public class NetworkConnected {
//判斷是否有網路
public static boolean isNetworkConnected(Context context) {
if (context != null) {
ConnectivityManager mConnectivityManager = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();
if (mNetworkInfo != null) {
return mNetworkInfo.isAvailable();
}
}
return false;
}
}
//Dao包和
public class NewsDao {
private final SQLiteDatabase db;
public static final String TABLE_NAME = "news";
public static final String COLUMN_ID = "id";
public static final String COLUMN_TITLE = "title";
public static final String COLUMN_DATE = "_date";
public static final String COLUMN_CATEGORY = "category";
public static final String COLUMN_AUTHOR_NAME = "author_name";
public static final String COLUMN_URL = "url";
public static final String COLUMN_THUMBNAIL_01 = "thumbnail_pic_s";
public static final String COLUMN_THUMBNAIL_02 = "thumbnail_pic_s02";
public static final String COLUMN_THUMBNAIL_03 = "thumbnail_pic_s03";
public NewsDao(Context context) {
DBHelper helper = new DBHelper(context);
db = helper.getWritableDatabase();
}
/**
* 插入資料
*
* @param list
* @return
*/
public int insert(ArrayList<News.DataBean> list) {
int count = 0;
ContentValues values = new ContentValues();
for (News.DataBean bean : list) {
/**
* 有這條資料就不作操作，沒有的時候才插入
*/
if (!hasId(bean.getUniquekey())) {
values.put(COLUMN_ID, bean.getUniquekey());
values.put(COLUMN_TITLE, bean.getTitle());
values.put(COLUMN_DATE, bean.getDate());
values.put(COLUMN_CATEGORY, bean.getCategory());
values.put(COLUMN_AUTHOR_NAME, bean.getAuthor_name());
values.put(COLUMN_URL, bean.getUrl());
values.put(COLUMN_THUMBNAIL_01, TextUtils.isEmpty(bean.getThumbnail_pic_s()) ? "" : bean.getThumbnail_pic_s());
values.put(COLUMN_THUMBNAIL_02, TextUtils.isEmpty(bean.getThumbnail_pic_s02()) ? "" : bean.getThumbnail_pic_s02());
values.put(COLUMN_THUMBNAIL_03, TextUtils.isEmpty(bean.getThumbnail_pic_s03()) ? "" : bean.getThumbnail_pic_s03());
long l = db.insert(TABLE_NAME, null, values);
if (l > 0) {
count++;
}
}
}
return count;
}
/**
* 查詢資料庫中有沒有這條id的資料
*
* @param id
* @return
*/
public boolean hasId(String id) {
Cursor cursor = db.query(TABLE_NAME, null, COLUMN_ID + "=?", new String[]{id}, null, null, null);
if (cursor.moveToNext()) {
return true;
}
return false;
}
/**
* 查詢所有的資料
*
* @return
*/
public ArrayList<News.DataBean> queryAll() {
ArrayList<News.DataBean> list = new ArrayList<>();
Cursor cursor = db.query(TABLE_NAME, null, null, null, null, null, null);
while (cursor.moveToNext()) {
News.DataBean bean = new News.DataBean();
bean.setUniquekey(cursor.getString(cursor.getColumnIndex(COLUMN_ID)));
bean.setTitle(cursor.getString(cursor.getColumnIndex(COLUMN_TITLE)));
bean.setDate(cursor.getString(cursor.getColumnIndex(COLUMN_DATE)));
bean.setAuthor_name(cursor.getString(cursor.getColumnIndex(COLUMN_AUTHOR_NAME)));
bean.setCategory(cursor.getString(cursor.getColumnIndex(COLUMN_CATEGORY)));
bean.setUrl(cursor.getString(cursor.getColumnIndex(COLUMN_URL)));
bean.setThumbnail_pic_s(cursor.getString(cursor.getColumnIndex(COLUMN_THUMBNAIL_01)));
bean.setThumbnail_pic_s02(cursor.getString(cursor.getColumnIndex(COLUMN_THUMBNAIL_02)));
bean.setThumbnail_pic_s03(cursor.getString(cursor.getColumnIndex(COLUMN_THUMBNAIL_03)));
list.add(bean);
}
return list;
}
/**
* 根據頁數查詢出資料
* @param page
* @return
*/
public ArrayList<News.DataBean> queryPage(int page) {
// page=1 ==> 0-29, limit 0, 30
// page=2 ==> 30-59 limit 30, 30
String limit = (page - 1) * 30 + ", 30";
ArrayList<News.DataBean> list = new ArrayList<>();
Cursor cursor = db.query(TABLE_NAME, null, null, null, null, null, null, limit);
while (cursor.moveToNext()) {
News.DataBean bean = new News.DataBean();
bean.setUniquekey(cursor.getString(cursor.getColumnIndex(COLUMN_ID)));
bean.setTitle(cursor.getString(cursor.getColumnIndex(COLUMN_TITLE)));
bean.setDate(cursor.getString(cursor.getColumnIndex(COLUMN_DATE)));
bean.setAuthor_name(cursor.getString(cursor.getColumnIndex(COLUMN_AUTHOR_NAME)));
bean.setCategory(cursor.getString(cursor.getColumnIndex(COLUMN_CATEGORY)));
bean.setUrl(cursor.getString(cursor.getColumnIndex(COLUMN_URL)));
bean.setThumbnail_pic_s(cursor.getString(cursor.getColumnIndex(COLUMN_THUMBNAIL_01)));
bean.setThumbnail_pic_s02(cursor.getString(cursor.getColumnIndex(COLUMN_THUMBNAIL_02)));
bean.setThumbnail_pic_s03(cursor.getString(cursor.getColumnIndex(COLUMN_THUMBNAIL_03)));
list.add(bean);
}
return list;
}
}
public class DBHelper extends SQLiteOpenHelper {
public static final String DB_NAME = "news.db";
public static final int DB_VERSION = 1;
public DBHelper(Context context) {
super(context, DB_NAME, null, DB_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
String sql = "create table " + NewsDao.TABLE_NAME + "(" + NewsDao.COLUMN_ID
+ " text primary key," +
NewsDao.COLUMN_TITLE + " text," +
NewsDao.COLUMN_DATE + " text," +
NewsDao.COLUMN_CATEGORY + " text," +
NewsDao.COLUMN_AUTHOR_NAME + " text," +
NewsDao.COLUMN_URL + " text," +
NewsDao.COLUMN_THUMBNAIL_01 + " text," +
NewsDao.COLUMN_THUMBNAIL_02 + " text," +
NewsDao.COLUMN_THUMBNAIL_03 + " text)";
db.execSQL(sql);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
//ImageLoader全域性配置
public class MyApplication extends Application {
private File file;
private DiskCache diskCache;
@Override
public void onCreate() {
super.onCreate();
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
File rootSD = Environment.getExternalStorageDirectory();
file = new File(rootSD, "imagefile");
if (!file.exists()){
file.mkdirs();
}
}
try {
diskCache = new LruDiskCache(file, new Md5FileNameGenerator(), 50 * 1024 * 1024);
} catch (IOException e) {
e.printStackTrace();
}
BitmapDisplayer displayer = new RoundedBitmapDisplayer(10);
DisplayImageOptions options = new DisplayImageOptions.Builder()
.cacheInMemory(true)
.cacheOnDisk(true)
.bitmapConfig(Bitmap.Config.RGB_565)
.displayer(displayer)
.showImageForEmptyUri(R.mipmap.ic_launcher)
.showImageOnFail(R.mipmap.ic_launcher)
.showImageOnLoading(R.mipmap.ic_launcher)
.build();
ImageLoaderConfiguration configuration = new ImageLoaderConfiguration.Builder(this)
.diskCache(diskCache)
.memoryCache(new LruMemoryCache(12*1024*1024))
.threadPoolSize(3)
.defaultDisplayImageOptions(options)
.build();
ImageLoader.getInstance().init(configuration);
}
}
//清單檔案
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="bawei.com.activity">
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"
tools:ignore="ProtectedPermissions" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<application
android:name=".MyApplication"
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".BaseActivity"></activity>
</application>
</manifest>