package com.kelin.mvvmlight.zhihu; import android.databinding.DataBindingUtil; import android.databinding.ViewDataBinding; import android.graphics.Color; import android.os.Bundle; import android.support.design.widget.AppBarLayout; import android.support.design.widget.CollapsingToolbarLayout; import android.support.design.widget.NavigationView; import android.support.v4.view.GravityCompat; import android.support.v4.view.ViewPager; import android.support.v4.widget.DrawerLayout; import android.support.v7.app.ActionBarDrawerToggle; import android.support.v7.widget.Toolbar; import android.text.SpannableString; import android.view.Menu; import android.view.MenuItem; import com.kelin.mvvmlight.messenger.Messenger; import com.kelin.mvvmlight.zhihu.news.NewsListFragment; import com.kelin.mvvmlight.zhihu.utils.AlphaForegroundColorSpan; import com.kelin.mvvmlight.zhihu.utils.ViewUtils; import com.trello.rxlifecycle.components.support.RxAppCompatActivity; import com.viewpagerindicator.CirclePageIndicator; public class MainActivity extends RxAppCompatActivity implements NavigationView.OnNavigationItemSelectedListener { private AlphaForegroundColorSpan alphaForegroundColorSpan; private SpannableString actionBarTitleSpan; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); ViewDataBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main); binding.setVariable(com.kelin.mvvmlight.zhihu.BR.viewModel, new MainViewModel(this)); CollapsingToolbarLayout collapsingToolbarLayout = (CollapsingToolbarLayout) findViewById(R.id.collapsing_toolbar); Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); getSupportActionBar().setDisplayShowTitleEnabled(true); ((AppBarLayout) findViewById(R.id.appBarLayout)).addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() { @Override public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) { int height = appBarLayout.getHeight() - getSupportActionBar().getHeight() - ViewUtils.getStatusBarHeight(MainActivity.this); int alpha = 255 * (0 - verticalOffset) / height; collapsingToolbarLayout.setExpandedTitleColor(Color.argb(0, 255, 255, 255)); collapsingToolbarLayout.setCollapsedTitleTextColor(Color.argb(alpha, 255, 255, 255)); } }); CirclePageIndicator circlePageIndicator = (CirclePageIndicator) findViewById(R.id.indicator); ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager); // Indicator must setViewPager after setAdapter,but data for ViewPager is load in other ViewModel Messenger.getDefault().register(this, MainViewModel.TOKEN_UPDATE_INDICATOR, () -> circlePageIndicator.setViewPager(viewPager)); DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); ActionBarDrawerToggle toggle = new ActionBarDrawerToggle( this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close); drawer.setDrawerListener(toggle); toggle.syncState(); NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view); navigationView.setNavigationItemSelectedListener(this); NewsListFragment fragment = new NewsListFragment(); getFragmentManager().beginTransaction() .replace(R.id.content, fragment) .commit(); } @Override public void onBackPressed() { DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); if (drawer.isDrawerOpen(GravityCompat.START)) { drawer.closeDrawer(GravityCompat.START); } else { super.onBackPressed(); } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, 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); } @SuppressWarnings("StatementWithEmptyBody") @Override public boolean onNavigationItemSelected(MenuItem item) { // Handle navigation view item clicks here. int id = item.getItemId(); if (id == R.id.nav_gallery) { NewsListFragment fragment = new NewsListFragment(); getFragmentManager().beginTransaction() .replace(R.id.content, fragment) .commit(); } DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); drawer.closeDrawer(GravityCompat.START); return true; } @Override protected void onDestroy() { super.onDestroy(); Messenger.getDefault().unregister(this); } }