content: package com.taobao.demo;
  
  import android.os.AsyncTask;
  import android.os.Bundle;
  import android.support.design.widget.FloatingActionButton;
  import android.support.v7.app.AppCompatActivity;
  import android.support.v7.widget.Toolbar;
  import android.view.Menu;
  import android.widget.TextView;
  
  
  public class UpdateDemoActivity extends AppCompatActivity {
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_scrolling);
          Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
          setSupportActionBar(toolbar);
          ((TextView)findViewById(R.id.tv_guide)).setText(getString(R.string.update_step));
          FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
          fab.setOnClickListener(view -> {
  //                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
  //                        .setAction("Action", null).show();
              new AsyncTask<Void, Void, Void>() {
                  @Override
                  protected Void doInBackground(Void... voids) {
  //                    Updater.update(getBaseContext());
                      return null;
                  }
  
                  @Override
                  protected void onPostExecute(Void aVoid) {
                      android.os.Process.killProcess(android.os.Process.myPid());
                  }
              }.execute();
          });
      }
  
      @Override
      public boolean onCreateOptionsMenu(Menu menu) {
          // Inflate the menu; this adds items to the action bar if it is present.
  //        getMenuInflater().inflate(R.menu.menu_scrolling, menu);
          return true;
      }
  
  //    @Override
  //    public boolean onOptionsItemSelected(MenuItem item) {
  //        // Handle action bar item clicks here. The action bar will
  //        // automatically handle clicks on the Home/Up button, so long
  //        // as you specify a parent activity in AndroidManifest.xml.
  //        int id = item.getItemId();
  //
  //        //noinspection SimplifiableIfStatement
  //        if (id == R.id.action_settings) {
  //            return true;
  //        }
  //        return super.onOptionsItemSelected(item);
  //    }
  }
  