Android实战简单新闻客户端(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;
                    }
                });
    }