xlistview上拉和加载重新刷新+数据库添加字段+webview

public class MainActivity extends AppCompatActivity implements XListView.IXListViewListener {

private XListView xlist;
private List<Bean.DataBean> list;
int id=1;
private String s;
String path = "http://ic.snssdk.com/2/article/v25/stream/?category=news_tech&count=20&bd_latitude=4.9E-324&bd_longitude=4.9E-324&bd_loc_time=1457695555&loc_mode=5&lac=4527&cid=28883&iid=3835029558&device_id=12211880440&ac=wifi&channel=baidu&aid=13&app_name=news_article&version_code=460&device_platform=android&device_type=iToolsAVM&os_api="+id;
private MyAdapter myAdapter;
private Handler handler=new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
//            刷新数据
myAdapter.notifyDataSetChanged();
xlist.stopRefresh();
xlist.stopLoadMore();
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

//        初始化ID
xlist = (XListView) findViewById(R.id.xlist);

//        调用请求数据
indate();

//        刷新和下拉和监听
xlist.setPullRefreshEnable(true);
xlist.setPullLoadEnable(true);
xlist.setXListViewListener(this);

//          点击某一新闻，通过webview加载详情页
xlist.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {

Intent intent=new Intent(MainActivity.this,Main2Activity.class);

intent.putExtra("url",list.get(position-1).getArticle_url());

startActivity(intent);

return false;
}
});
}
@Override
public void onRefresh() {
handler.postDelayed(new Runnable() {
@Override
public void run() {
//
4000
实现上拉加载下一页，数据累加，url中os_api=1表示第一页
id++;
Gson gson = new Gson();
Bean bean = gson.fromJson(s, Bean.class);
list = bean.getData();
myAdapter = new MyAdapter();
xlist.setAdapter(myAdapter);

list.addAll(list);
}
},2000);
handler.sendEmptyMessage(1);
}

@Override
public void onLoadMore() {

handler.postDelayed(new Runnable() {
@Override
public void run() {
//实现下拉刷新，数据重新加载
list.addAll(list);
}
},2000);
handler.sendEmptyMessage(1);
}

//异步加载请求数据
public void indate() {

new AsyncTask<String,Void,String>(){
private ByteArrayOutputStream outputStream;

@Override
protected String doInBackground(String... params) {

try {
URL url = new URL(params[0]);
HttpURLConnection connetion= (HttpURLConnection) url.openConnection();
connetion.setRequestMethod("GET");
connetion.setConnectTimeout(3000);
int responseCode = connetion.getResponseCode();
if(responseCode==200){
InputStream inputStream = connetion.getInputStream();

outputStream = new ByteArrayOutputStream();
int len;
byte[] by=new byte[1024];

while ((len=inputStream.read(by))!=-1){
outputStream.write(by,0,len);
}

s = outputStream.toString();

}
} catch (Exception e) {
e.printStackTrace();
}
return s;
}

@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);

Gson gson = new Gson();
Bean bean = gson.fromJson(s, Bean.class);

list = bean.getData();

//                添加数据库的foreach
for (Bean.DataBean list2:list) {

String title = list2.getTitle();
String suo = list2.getSource();
//                  dao包
Dao dao = new Dao(MainActivity.this);
//    添加的方法
Boolean add = dao.add(title, suo);

Toast.makeText(MainActivity.this,add+"",Toast.LENGTH_LONG).show();
}

//                适配器,关联
myAdapter = new MyAdapter();

xlist.setAdapter(myAdapter);
}
}.execute(path);
}

//    xlistview适配器
class MyAdapter extends BaseAdapter{

@Override
public int getCount() {
return list.size();
}

@Override
public Object getItem(int position) {
return null;
}

@Override
public long getItemId(int position) {
return 0;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {

convertView=View.inflate(MainActivity.this,R.layout.item,null);

ImageView img= (ImageView) convertView.findViewById(R.id.img);
TextView tv1= (TextView) convertView.findViewById(R.id.tv1);
TextView tv2= (TextView) convertView.findViewById(R.id.tv2);

//因为这网址的图片有问题所以下标必须是死值,否者就不能运行,打上注释是因为webview得是活值,那这就会报错
// ImageLoader.getInstance().displayImage(list.get(0).getImage_list().get(0).getUrl(),img);
tv1.setText(list.get(position).getTitle());
tv2.setText(list.get(position).getSource());
return convertView;
}
}
}

2.main.xml

<com.bawei.util.XListView
android:id="@+id/xlist"
android:layout_width="match_parent"
android:layout_height="match_parent"></com.bawei.util.XListView>

3.item.xml

<ImageView
android:id="@+id/img"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@mipmap/ic_launcher"/>

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/tv1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:text="123"
android:textSize="20dp"/>
<TextView
android:id="@+id/tv2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:text="123"
android:layout_marginTop="10dp"
android:textSize="15dp"/>

</LinearLayout>

4.MainActvty2也就是webviewde接受值

public class Main2Activity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);

//        初始化ID
WebView web= (WebView) findViewById(R.id.web);

//        接受值
Intent intent = getIntent();
String url = intent.getStringExtra("url");

//        webview
web.loadUrl(url);
}
}

5.webview.xml

<WebView
android:id="@+id/web"
android:layout_width="match_parent"
android:layout_height="match_parent"></WebView>

6.数据库别忘了继承

public class SQLile extends SQLiteOpenHelper {
public SQLile(Context context) {
//        创建数据库
super(context,"dd.db",null,1);
}

@Override
public void onCreate(SQLiteDatabase db) {
//建表
db.execSQL("create table user(id integer primary key autoincrement,"
+ "title varchar(50),suo varchar(50))");
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

}
}

7.dao包添加方法

public class Dao {

private final SQLiteDatabase database;

//上下文
public Dao(Context context){

SQLile sqLile = new SQLile(context);

//        具体方法
database = sqLile.getWritableDatabase();

}

//    添加的方法
public Boolean add(String title,String suo){

ContentValues values = new ContentValues();
values.put("title",title);
values.put("suo",suo);

long insert = database.insert("user", null, values);

if(insert!=-1){
return true;
}else {
return false;
}
}
}

8.其他的数据库

8.1 修改

public Boolean update(String name,String nname) {

 		 ContentValues values = new ContentValues();

  		 values.put("name", name);
  
 		int update = sd.update("user", values, "name = ?", new String[] { nname });
  
  		  if (update != -1) {
                      return true;
                  } else {
                    return false;
                  }
                  }

8.2  删除:

              public Boolean delete(String name) {

                int delete = sd.delete("user", "name = ?", new String[] {name} );

                if (delete != -1) {
                   return true;
                }else{
                   return false;
                 }
 }
 

8.3  条件查询

              public List<User> findone(String id){
  
                List<User> list = new ArrayList<User>();
  
              Cursor cursor = sd.query("user", null, "id = ?", new String[]{id}, null, null, null);
  
            while(cursor.moveToNext()){
   
                String name = cursor.getString(cursor.getColumnIndex("name"));
                String age = cursor.getString(cursor.getColumnIndex("age"));
   
                  User user = new User();
   
                   user.setName(name);
                   user.setAge(age);
   
                   list.add(user);
   
               }
                    return list;
            }

8.4  查询全部:

           public List<User> findall(){
  
                List<User> list = new ArrayList<User>();
  
                Cursor cursor = sd.query("user", null, null, null, null, null, null);
  
                while(cursor.moveToNext()){
   
                String name = cursor.getString(cursor.getColumnIndex("name"));
                String age = cursor.getString(cursor.getColumnIndex("age"));
   
                User user = new User();
   
                user.setName(name);
                user.setAge(age);
   
                list.add(user);
   
             }
                 return list;
 }
}