今日头条的主类

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private ImageView touimg,qqtu,yejian;
    private TabLayout tablayout;
    private ViewPager pager;


    private SlidingMenu slidingMenu;
    private QQOauthUtils qq;
    private int theme = R.style.AppTheme;
    private List<ChannelBean> list = new ArrayList<>();
    private String jsonbeans;
    private SharedPreferences pre;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (savedInstanceState != null) {
            theme = savedInstanceState.getInt("theme");
            setTheme(theme);
        }
        setContentView(R.layout.activity_main);
        boolean b=chexkNet();
        if(!b){
            AlertDialog.Builder builder=new AlertDialog.Builder(this);
            builder.setMessage("去设置");
            builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    Toast.makeText(MainActivity.this,"去设置网络",Toast.LENGTH_SHORT).show();
                    Intent it=new Intent("android.settings.WIRELESS_SETTINGS");
                    startActivity(it);
                    return;

                }
            });
            builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                  Toast.makeText(MainActivity.this,"查看本地",Toast.LENGTH_SHORT).show();

                }
            });
            builder.create();
            builder.show();



        }
        else{
            Toast.makeText(MainActivity.this,"网络连接",Toast.LENGTH_SHORT).show();;
        }



        touimg = (ImageView) findViewById(R.id.touimg);
        Handertu();
        qqtu = (ImageView) findViewById(R.id.qqtu);
        qq = new QQOauthUtils();
        yejian = (ImageView) findViewById(R.id.yejian);
        yejian.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                theme = (theme == R.style.AppTheme) ? R.style.NightAppTheme : R.style.AppTheme;
                MainActivity.this.recreate();
            }
        });
                 Hudong();







    }



    private boolean chexkNet(){
        ConnectivityManager conn= (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo info =   conn.getActiveNetworkInfo();
          if(info!=null&&info.isConnected()){
              return true;
          }

        return false;
    }









    private void Hudong() {
        tablayout= (TabLayout) findViewById(R.id.tab);
        pager= (ViewPager) findViewById(R.id.pager);
        tablayout.setupWithViewPager(pager);
        pager.setAdapter(new Myapter(getSupportFragmentManager()));

    }

    public void sheZhi(View v) {

       startActivity(new Intent(MainActivity.this,Shezhi.class));



    }


    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putInt("theme", theme);
    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);

        theme = savedInstanceState.getInt("theme");

    }













    public void QQtu(View v){
        qq.qqLogin(this);
        UMShareAPI umShareAPI = UMShareAPI.get(this);
        umShareAPI.getPlatformInfo(MainActivity.this, SHARE_MEDIA.QQ, new UMAuthListener() {
            @Override
            public void onStart(SHARE_MEDIA share_media) {
            }
            @Override
            public void onComplete(SHARE_MEDIA share_media, int i, Map<String, String> map) {
                if (i==0){
                    Toast.makeText(MainActivity.this,"登陆成功",Toast.LENGTH_LONG).show();
                }else if (i==2){
                    String s = map.get("iconurl");
                    ImageOptions.Builder builder=new ImageOptions.Builder();
                    builder.setRadius(90);
                    ImageOptions imageOptions=builder.build();
                    x.image().bind(qqtu,s,imageOptions);
                    x.image().bind(touimg,s,imageOptions);
                }
            }

            @Override
            public void onError(SHARE_MEDIA share_media, int i, Throwable throwable) {

            }
            @Override
            public void onCancel(SHARE_MEDIA share_media, int i) {

            }
        });

        }

        @Override
        protected void onActivityResult(int requestCode, int resultCode, Intent data) {
            super.onActivityResult(requestCode, resultCode, data);
            qq.onActivityResult(requestCode, resultCode, data);
            UMShareAPI.get(this).onActivityResult(requestCode, resultCode, data);



                          if(requestCode== ChannelActivity.REQUEST_CODE&&resultCode==ChannelActivity.RESULT_CODE){
                    jsonbeans = data.getStringExtra(ChannelActivity.RESULT_JSON_KEY);
                    Log.e("onActivityResult","onActivityResult: "+jsonbeans);
                    System.out.println("-----------------------------"+jsonbeans);

            }










        }




    public void Handertu(){
        slidingMenu=new SlidingMenu(this);
        slidingMenu.setMode(slidingMenu.LEFT);
        slidingMenu.setTouchModeAbove(SlidingMenu.TOUCHMODE_FULLSCREEN);
        slidingMenu.setBehindOffset(100);
        slidingMenu.setFadeDegree(1f);
        slidingMenu.attachToActivity(this,slidingMenu.SLIDING_CONTENT);
        slidingMenu.setMenu(R.layout.cela);
        touimg.setOnClickListener(this);


    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
           case R.id.touimg:
            slidingMenu.toggle();
                 break;
        }
    }






    public void getit(View v){
        //先获取一个oncilk的控件，放在main外
        // 1. 在app的gradle里面
        //compile 'com.github.andyoom:draggrid:v1.0.1'

        //    2.在项目的build.gradle中添加
        //        maven {url "https://jitpack.io"}放在  jcenter()下面


        pre = getSharedPreferences("channel",MODE_PRIVATE);
        jsonbeans = pre.getString("beans",null);
        if(jsonbeans==null){
            lintList();
            ChannelActivity.startChannelActivity(this,list);
        } else {
            ChannelActivity.startChannelActivity(this,jsonbeans);
        }
    }
    private void lintList() {
        list.add(new ChannelBean("热点",true));
        list.add(new ChannelBean("视频",true));

        list.add(new ChannelBean("社会",false));
        list.add(new ChannelBean("娱乐",false));
        list.add(new ChannelBean("军事",false));
        list.add(new ChannelBean("图片",false));
        list.add(new ChannelBean("体育",false));
        list.add(new ChannelBean("汽车",false));
        list.add(new ChannelBean("国境",false));
    }




    @Override
    public void onBackPressed() {
        super.onBackPressed();
        SharedPreferences.Editor editor = pre.edit();
        editor.putString("beans",jsonbeans);
        editor.commit();
    }

}