基于Android官方DrawerLayout实现抽屉导航菜单
我之前写了一篇文章，基于第三方开源框架Android SlidingMenu实现抽屉导航菜单，文章链接地址：http://blog.csdn.net/zhangphil/article/details/44078805
事实上实现Android抽屉导航菜单的技术选型方案不少，其中还有一种方案就是基于Android官方的DrawerLayout。
如图1，图2所示就是基于Android官方DrawerLayout实现抽屉导航菜单。
图1
图2
Android DrawerLayout是Android在android-support-v4中引入的一个新的View组件，其本身继承自ViewGroup。使用DrawerLayout首先需要在项目代码中引入android-support-v4.jar包，好在现在基本上android-support-v4.jar包在Eclipse工程中已经默认添加。
开始写DrawerLayout代码实现抽屉导航菜单。
（1） 首先写一个布局文件activity_main.xml。
<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" >
<FrameLayout
android:id="@+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<ListView
android:id="@+id/left_drawer"
android:layout_width="100dip"
android:layout_height="match_parent"
android:layout_gravity="left"
android:background="#42a5f5"
android:choiceMode="singleChoice"
android:divider="@android:color/transparent"
android:dividerHeight="5dip" />
</android.support.v4.widget.DrawerLayout>
在这本布局文件中，最上面的android:id="@+id/content_frame"的FrameLayout即为要打算盛放具体页面和内容容器。
而android:id="@+id/left_drawer"的ListView即为将要滑入滑出的导航菜单。为此ListView设置android:layout_gravity="left"，表示告知Android系统导航菜单要从左边滑入滑出。如果为“right”则表示要从右边滑入滑出。
（2）布局文件写完后，接下来就可以写代码实现。
package zhangphil.navigationdrawer;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.content.res.Configuration;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.widget.DrawerLayout;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
private static Activity activity;
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
private CharSequence mDrawerTitle;
private CharSequence mTitle;
private static String[] mTitles = { "A", "B", "C", "D", "E" };
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
activity = this;
setContentView(R.layout.activity_main);
mTitle = mDrawerTitle = this.getTitle();
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.left_drawer);
// mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow,
// GravityCompat.START);
mDrawerList.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, mTitles));
mDrawerList.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
selectItem(position);
}
});
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, R.drawable.ic_drawer, R.string.drawer_open,
R.string.drawer_close) {
@Override
public void onDrawerClosed(View view) {
getActionBar().setTitle(mTitle);
Toast.makeText(activity, "抽屉关闭", Toast.LENGTH_SHORT).show();
// invalidateOptionsMenu();
}
@Override
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(mDrawerTitle);
Toast.makeText(activity, "抽屉打开", Toast.LENGTH_SHORT).show();
// invalidateOptionsMenu();
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null) {
selectItem(0);
}
}
private void selectItem(int position) {
Fragment fragment = new TextFragment();
Bundle args = new Bundle();
args.putInt(TextFragment.NUMBER, position);
fragment.setArguments(args);
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();
mDrawerList.setItemChecked(position, true);
setTitle(mTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
}
@Override
public void setTitle(CharSequence title) {
mTitle = title;
getActionBar().setTitle(mTitle);
}
// @Override
// public boolean onCreateOptionsMenu(Menu menu) {
// return super.onCreateOptionsMenu(menu);
// }
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
mDrawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
mDrawerToggle.onConfigurationChanged(newConfig);
}
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
return super.onPrepareOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
return super.onOptionsItemSelected(item);
}
public static class TextFragment extends Fragment {
public static final String NUMBER = "number";
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
int i = getArguments().getInt(NUMBER);
String title = mTitles[i];
TextView text = new TextView(activity);
text.setText("内容:" + title);
text.setTextSize(50.0f);
text.setGravity(Gravity.CENTER);
activity.setTitle("标题:" + title);
return text;
}
}
}
DrawerLayout可以设置一个监听事件类setDrawerListener(new ActionBarDrawerToggle())监听抽屉导航菜单的打开、关闭状态。
我将此例的全部工程代码压缩成一个zip文件，上传到CSDN供有兴趣的朋友下载，下载链接：http://download.csdn.net/detail/zhangphil/9136213
此压缩包下载后直接作为Android Eclipse的工程导入即可跑起来。