Android -- DrawerLayout_移动开发

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Android -- DrawerLayout

2014/9/5 3:12:20 我爱物联网程序员俱乐部我要评论(0)

摘要：抽屉效果的导航菜单喜欢知乎的都应该装的用知乎日报吧~这里指Android的不是IOS的。知乎日报的导航菜单就是用DrawerLayout实现的。觉得这种侧滑的抽屉效果的菜单很好。不用切换到另一个页面，也不用去按菜单的硬件按钮，直接在界面上一个按钮点击，菜单就滑出来，而且感觉能放很多东西。android-support-v4.jar首先，DrawerLayout这个类是在SupportLibrary里的，需要加上android-support-v4.jar这个包
标签：android

抽屉效果的导航菜单

喜欢知乎的都应该装的用知乎日报吧~这里指Android的不是IOS的。知乎日报的导航菜单就是用DrawerLayout实现的。

觉得这种侧滑的抽屉效果的菜单很好。

不用切换到另一个页面，也不用去按菜单的硬件按钮，直接在界面上一个按钮点击，菜单就滑出来，而且感觉能放很多东西。

android-support-v4.jar

首先， DrawerLayout这个类是在Support Library里的，需要加上android-support-v4.jar这个包。

然后程序中用时在前面导入import android.support.v4.widget.DrawerLayout;

如果找不到这个类，首先用SDK Manager更新一下Android Support Library，然后在Android SDK\extras\android\support\v4路径下找到android-support-v4.jar，复制到项目的libs路径，将其Add to Build Path.

Code

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <android.support.v4.widget.DrawerLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/drawer_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <!-- The main content view -->
        <!-- main content must be the first element of DrawerLayout because it will be drawn first and drawer must be on top of it -->

        <FrameLayout
            android:id="@+id/content_frame"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

        <!-- The navigation drawer -->

        <ListView
            android:id="@+id/left_drawer"
            android:layout_width="240dp"
            android:layout_height="match_parent"
            android:layout_gravity="left"
            android:background="#111"
            android:choiceMode="singleChoice"
            android:divider="@android:color/transparent"
            android:dividerHeight="0dp" />
    </android.support.v4.widget.DrawerLayout>

</RelativeLayout>

DrawerLayout的第一个子元素是主要内容，即抽屉没有打开时显示的布局。这里采用了一个FrameLayout，里面什么也没放。

DrawerLayout的第二个子元素是抽屉中的内容，即抽屉布局，这里采用了一个ListView。

import android.os.Bundle;
import android.app.Activity;
import android.content.res.Configuration;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;

public class HelloDrawerActivity extends Activity
{

    private String[] mPlanetTitles;
    private DrawerLayout mDrawerLayout;
    private ActionBarDrawerToggle mDrawerToggle;
    private ListView mDrawerList;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_hello_drawer);

        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);

        // init the ListView and Adapter, nothing new
        initListView();

        // set a custom shadow that overlays the main content when the drawer
        // opens
        mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow,
                GravityCompat.START);

        mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
                R.drawable.ic_drawer, R.string.drawer_open,
                R.string.drawer_close)
        {

            /** Called when a drawer has settled in a completely closed state. */
            public void onDrawerClosed(View view)
            {

                invalidateOptionsMenu(); // creates call to
                                            // onPrepareOptionsMenu()
            }

            /** Called when a drawer has settled in a completely open state. */
            public void onDrawerOpened(View drawerView)
            {

                invalidateOptionsMenu(); // creates call to
                                            // onPrepareOptionsMenu()
            }
        };

        // Set the drawer toggle as the DrawerListener
        mDrawerLayout.setDrawerListener(mDrawerToggle);

        // enable ActionBar app icon to behave as action to toggle nav drawer
        getActionBar().setDisplayHomeAsUpEnabled(true);
        // getActionBar().setHomeButtonEnabled(true);
        // Note: getActionBar() Added in API level 11
    }

    private void initListView()
    {
        mDrawerList = (ListView) findViewById(R.id.left_drawer);

        mPlanetTitles = getResources().getStringArray(R.array.planets_array);

        // Set the adapter for the list view
        mDrawerList.setAdapter(new ArrayAdapter<String>(this,
                R.layout.list_item, mPlanetTitles));
        // Set the list's click listener
        mDrawerList.setOnItemClickListener(new OnItemClickListener()
        {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id)
            {
                // Highlight the selected item, update the title, and close the
                // drawer
                mDrawerList.setItemChecked(position, true);
                setTitle(mPlanetTitles[position]);
                mDrawerLayout.closeDrawer(mDrawerList);
            }
        });
    }

    @Override
    protected void onPostCreate(Bundle savedInstanceState)
    {
        super.onPostCreate(savedInstanceState);
        // Sync the toggle state after onRestoreInstanceState has occurred.
        mDrawerToggle.syncState();
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig)
    {
        super.onConfigurationChanged(newConfig);
        mDrawerToggle.onConfigurationChanged(newConfig);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item)
    {
        // Pass the event to ActionBarDrawerToggle, if it returns
        // true, then it has handled the app icon touch event
        if (mDrawerToggle.onOptionsItemSelected(item))
        {
            return true;
        }
        // Handle your other action bar items...

        return super.onOptionsItemSelected(item);
    }

}

例子是从官方实例中扒出来的，比较纠结的是用了Level 11的一个API，这样minSdkVersion就有限制，不能太低。

Or Code

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".DrawerActivity" >

    <android.support.v4.widget.DrawerLayout
        android:id="@+id/drawer_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <!-- The main content view -->

        <FrameLayout
            android:id="@+id/content_frame"
            android:layout_width="match_parent"
            android:layout_height="match_parent" >

            <Button
                android:id="@+id/btn"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="open" 
                />
        </FrameLayout>

        <!-- The navigation drawer -->

        <ListView
            android:id="@+id/left_drawer"
            android:layout_width="240dp"
            android:layout_height="match_parent"
            android:layout_gravity="start"
            android:background="#111"
            android:choiceMode="singleChoice"
            android:divider="@android:color/transparent"
            android:dividerHeight="0dp" />
    </android.support.v4.widget.DrawerLayout>

</RelativeLayout>

public class DrawerActivity extends Activity
{
    private DrawerLayout mDrawerLayout = null;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_drawer);

        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);

        Button button = (Button) findViewById(R.id.btn);
        button.setOnClickListener(new OnClickListener()
        {

            @Override
            public void onClick(View v)
            {
                // 按钮按下，将抽屉打开
                mDrawerLayout.openDrawer(Gravity.LEFT);

            }
        });
    }

}