获取网络数据

    compile 'org.greenrobot:eventbus:3.0.0'    compile'org.greenrobot:greendao:3.0.1'    compile'org.greenrobot:greendao-generator:3.0.0'    compile 'com.android.support:recyclerview-v7:26.0.0-alpha1'    compile 'com.squareup.retrofit2:retrofit:2.1.0'    compile 'com.squareup.retrofit2:converter-gson:2.1.0'    compile 'com.facebook.fresco:fresco:0.11.0'

 android:name=".utils.MyApplication"        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme"

MyApplication

 @Override    public void onCreate() {        super.onCreate();        Fresco.initialize(this);    }

MainActivity

public class MainActivity extends AppCompatActivity implements View.OnClickListener{    List<Fragment> list=new ArrayList<>();    private  TextView[] tvb;    private ViewPager vp;    private boolean flag;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);         vp= (ViewPager) findViewById(R.id.viewpge);      TextView tv1= (TextView) findViewById(R.id.tex0);        tv1.setOnClickListener(this);        TextView tv2= (TextView) findViewById(R.id.tex1);        tv2.setOnClickListener(this);        TextView tv3= (TextView) findViewById(R.id.tex2);        tv3.setOnClickListener(this);        TextView tv4= (TextView) findViewById(R.id.tex3);        tv4.setOnClickListener(this);        TextView tv5= (TextView) findViewById(R.id.tex4);        tv5.setOnClickListener(this);         tvb=new TextView[]{tv1,tv2,tv3,tv4,tv5};        list.add(new OneFragment());        list.add(new TwoFragment());        list.add(new ThreeFragment());        list.add(new fourFragment());        list.add(new FiveFragment());        if (isOnline()) {            GetData(0);        }else{          showDialog();        }        vp.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {            @Override            public Fragment getItem(int position) {                return list.get(position);            }            @Override            public int getCount() {                return list.size();            }        });        vp.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {            @Override            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {                GetData(position);            }            @Override            public void onPageSelected(int position) {            }            @Override            public void onPageScrollStateChanged(int state) {            }        });        GetData(0);    }    private void showDialog(){        AlertDialog.Builder builder = new AlertDialog.Builder(this);        builder.setMessage("无网络连接");        builder.setNegativeButton("关闭",null);        builder.setPositiveButton("转到网络设置", new DialogInterface.OnClickListener() {            @Override            public void onClick(DialogInterface dialog, int which) {                //设置跳转网络界面                startActivity(new Intent(Settings.ACTION_WIRELESS_SETTINGS));            }        });        builder.create().show();    }    public boolean isOnline() {        //得到网络连接的管理者        ConnectivityManager connMgr = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);        //通过网络管理者得到网络信息        NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();        //判断网络是否连接        return (networkInfo != null && networkInfo.isConnected());    }    public void GetData(int porsion){        for(int i=0;i<tvb.length;i++){                if (porsion==i){                    tvb[i].setTextColor(Color.BLUE);                }else{                    tvb[i].setTextColor(Color.BLACK);                }        }    }    /**     * Called when a view has been clicked.     *     * @param v The view that was clicked.     */    @Override    public void onClick(View v) {        switch (v.getId()){            case R.id.tex0:                vp.setCurrentItem(0);                GetData(0);                break;            case R.id.tex1:                vp.setCurrentItem(1);                GetData(1);                break;            case R.id.tex2:                vp.setCurrentItem(2);                GetData(2);                break;            case R.id.tex3:                vp.setCurrentItem(3);                GetData(3);                break;            case R.id.tex4:                vp.setCurrentItem(4);                GetData(04);                break;        }    }}

UtilsURL

 public static final String BASE_HOST_URL="******";    public  static final String TAGS="*****";

ServiceAPI

public interface ServiceAPI {    @GET(UtilsURL.TAGS)    Call<Bean> bean();}

Myadadap

public class Myadadap extends RecyclerView.Adapter<RecyclerView.ViewHolder>{    private List<Bean.ResultsBean> list=new ArrayList<>();    private Context context;    public Myadadap(List<Bean.ResultsBean> list, Context context) {        this.list = list;        this.context = context;    }    @Override    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        View inflat= LayoutInflater.from(context).inflate(R.layout.bj_item,parent,false);        return new sViewHodler(inflat);    }    @Override    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {        sViewHodler s= (sViewHodler) holder;        Uri uri=Uri.parse("http://img4q.duitang.com/uploads/item/201411/20/20141120132318_3eAuc.thumb.700_0.jpeg");        s.sim.setImageURI(uri);        s.tv2.setText(list.get(position).getPublishedAt());        s.tv1.setText(list.get(position).getDesc());    }    @Override    public int getItemCount() {        return list.size();    }    private class sViewHodler extends RecyclerView.ViewHolder{private SimpleDraweeView sim;        private TextView tv1;        private TextView tv2;        public sViewHodler(View itemView) {            super(itemView);            sim=itemView.findViewById(R.id.recee);            tv1=itemView.findViewById(R.id.tv1);            tv2=itemView.findViewById(R.id.tv2);        }    }}

OneFragment

public class OneFragment extends Fragment{    private View view;    private RecyclerView rec;    private List<Bean.ResultsBean>  list=new ArrayList<>();    private UserDao mUserDao;    private User mUser;    @Nullable    @Override    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {         view=inflater.inflate(R.layout.item2,null);//        EventBus.getDefault().register(getContext());        init();        Getdata();        return view;    }    private void init() {      rec= view.findViewById(R.id.rde);        LinearLayoutManager lin=new LinearLayoutManager(getActivity());        rec.setLayoutManager(lin);    }    private void Getdata() {        Retrofit retrofit=new Retrofit.Builder()                .baseUrl(UtilsURL.BASE_HOST_URL)                .addConverterFactory(GsonConverterFactory.create())                .build();        ServiceAPI serviceAPI = retrofit.create(ServiceAPI.class);        Call<Bean> bean = serviceAPI.bean();        bean.enqueue(new Callback<Bean>() {            @Override            public void onResponse(Call<Bean> call, Response<Bean> response) {                List<Bean.ResultsBean> results = response.body().getResults();                Myadadap myadadap=new Myadadap(results,getActivity());                rec.setAdapter(myadadap);                mUserDao = MyApplication.getInstances().getDaoSession().getUserDao();                for (int i = 0; i < results.size(); i++) {                    mUser = new User(null,results.get(i).getDesc());                    mUserDao.insert(mUser);//添加一个                }            }            @Override            public void onFailure(Call<Bean> call, Throwable t) {            }        });    }