简单新闻客户端(1)---主界面设计

模仿实例地址:SimpleNews

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前言这是github开源项目，原项目有四个模块。我这里之模仿其中
一个（新闻）。学会MD开发和MVP架构。

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主页布局:

这里主要使用了toolbar和DrawerLayout实现导航条以及侧滑的效果。
当然为了填充侧滑栏，又使用了NavigationView这个控件。

toolbar和DrawerLayout

我已经在前面的博客文章介绍过了:
android–UI—侧滑drawerLayout
android–UI–导航条toolbar
NavigationView实践
使用ToolBar代替ActionBar的时候,首先去掉Actionbar
修该主题:

<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">        <!-- Customize your theme here. -->        <item name="colorPrimary">@color/colorPrimary</item>        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>        <item name="colorAccent">@color/colorAccent</item>    </style>

为了使用NavigationView，添加依赖:

    compile 'com.android.support:design:24.2.0'

新人要知道如何搜索依赖添加:File–>ProjectStructure–>app–>Dependencies–>绿色加号–>Library Dependencies–>搜索–>双击

布局文件:activity_main.xml

<?xml version="1.0" encoding="utf-8"?><android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/drawer_layout"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:fitsSystemWindows="true"    tools:context=".Activity.MainActivity">    <RelativeLayout        android:layout_width="match_parent"        android:layout_height="match_parent">        <include            android:id="@+id/appbar"            layout="@layout/toolbar" />        <!-- Content -->        <FrameLayout            android:id="@+id/content_layout"            android:layout_width="match_parent"            android:layout_height="match_parent"            android:layout_below="@id/appbar" />    </RelativeLayout>    <!-- Drawer -->    <android.support.design.widget.NavigationView        android:id="@+id/navigation"        android:layout_width="240dp"        android:layout_height="match_parent"        android:layout_gravity="start"        app:headerLayout="@layout/drawer_head"        app:menu="@menu/drawer" /></android.support.v4.widget.DrawerLayout>

toolbar.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    android:id="@+id/appbar"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"    android:orientation="vertical">    <android.support.v7.widget.Toolbar        android:id="@+id/toolbar"        android:layout_width="match_parent"        android:layout_height="?attr/actionBarSize"        android:background="?attr/colorPrimary"        android:elevation="5dp"         /></LinearLayout>

menu文件，给侧边栏添加选项。以及顶部layout

<menu xmlns:android="http://schemas.android.com/apk/res/android">    <group android:checkableBehavior="single">        <item            android:id="@+id/navigation_original"            android:checked="true"            android:icon="@mipmap/ic_launcher"            android:title="菜单1"/>        <item            android:id="@+id/navigation_library"            android:icon="@mipmap/ic_launcher"            android:title="菜单2"/>    </group></menu>

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    android:layout_width="match_parent"    android:layout_height="192dp"    android:background="?attr/colorPrimaryDark"    android:gravity="center"    android:orientation="vertical"    android:padding="16dp"    android:theme="@style/ThemeOverlay.AppCompat.Dark">    <ImageView        android:src="@mipmap/ic_launcher"        android:layout_gravity="center"        android:layout_width="wrap_content"        android:layout_height="wrap_content" />    <TextView        android:layout_marginTop="10dp"        android:textSize="18sp"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="lw_zhaoritian"        android:gravity="center"       /></LinearLayout>

效果测试:

toolbar还是空的，需要在代码里设置。

MainActivity:

public class MainActivity extends AppCompatActivity {    private DrawerLayout mDrawerLayout;    private ActionBarDrawerToggle mDrawerToggle;    private Toolbar mToolbar;    private NavigationView mNavigationView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mToolbar = (Toolbar) findViewById(R.id.toolbar);        setSupportActionBar(mToolbar);        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);        mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, mToolbar, R.string.open,                R.string.close);        mDrawerToggle.syncState();        mDrawerLayout.setDrawerListener(mDrawerToggle);        mNavigationView = (NavigationView) findViewById(R.id.navigation);        setupDrawerContent(mNavigationView);    }    @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_main, menu);        return true;    }    @Override    public boolean onOptionsItemSelected(MenuItem item) {        int id = item.getItemId();        if (id == R.id.action_settings) {            Toast.makeText(getApplicationContext(),                 item.getTitle(), Toast.LENGTH_LONG).show();            return true;        }        return super.onOptionsItemSelected(item);    }    private void setupDrawerContent(NavigationView navigationView) {        navigationView.setNavigationItemSelectedListener(                new NavigationView.OnNavigationItemSelectedListener() {                    @Override                    public boolean onNavigationItemSelected(MenuItem menuItem) {                        Toast.makeText(getApplicationContext(),                                menuItem.getTitle(), Toast.LENGTH_LONG).show();                        menuItem.setChecked(true);                        mDrawerLayout.closeDrawers();                        return true;                    }                });    }}

测试:

讲解:
首先:获取当前的toolbar取代之前的actionbar

mToolbar = (Toolbar) findViewById(R.id.toolbar);        setSupportActionBar(mToolbar);

第一步:给toolbar添加menu并且添加事件—-详见 android–UI–导航条toolbar

第二步:
使用ActionBarDrawerToggle类，使我们的toolbar和drawer更好的显示。
参考文章:ActionBarDrawerToggle和ToolBar结合使用

ActionBarDrawerToggle就是DrawerLayout事件的监听器。
能

ActionBarDrawerToggle mDrawerToggle = new ActionBarDrawerToggle(getActivity(),                  drawerLayout, toolBar, R.string.drawer_open, R.string.drawer_close){              @Override              public void onDrawerOpened(View drawerView) {                  super.onDrawerOpened(drawerView);                  if (!mUserLearnedDrawer && !mFromSavedInstanceState) {                      mUserLearnedDrawer = true;                      saveToPreferences(getActivity(), KEY_USER_LEARNED_DWARER, mUserLearnedDrawer + "");                  }                  getActivity().invalidateOptionsMenu();              }              @Override              public void onDrawerClosed(View drawerView) {                  super.onDrawerClosed(drawerView);                  getActivity().invalidateOptionsMenu();              }              @Override              public void onDrawerSlide(View drawerView, float slideOffset) {                  if (slideOffset < 0.6) {                      toolBar.setAlpha(1 - slideOffset);                  }              }          };  

实例化ActionBarDrawerToggle时候三个参数:

mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, mToolbar, R.string.open,                R.string.close);        mDrawerToggle.syncState();

设置DrawerLayout监听:

mDrawerLayout.setDrawerListener(mDrawerToggle);

设置侧滑菜单的点击事件:

private void setupDrawerContent(NavigationView navigationView) {        navigationView.setNavigationItemSelectedListener(                new NavigationView.OnNavigationItemSelectedListener() {                    @Override                    public boolean onNavigationItemSelected(MenuItem menuItem) {                        Toast.makeText(getApplicationContext(),                                menuItem.getTitle(), Toast.LENGTH_LONG).show();                        menuItem.setChecked(true);                        mDrawerLayout.closeDrawers();                        return true;                    }                });    }