这是我使用NavigationDrawer创建的第一个应用程序。我有一个非常简单的问题。如何在NavigationDrawer主页中创建第一页？此外，我对格式化并不太熟悉，因为这是我第一次使用抽屉，所以如果有人比较熟悉我可以告诉我是否正确使用抽屉，我将不胜感激。现在每个页面只显示文本，但最终它会做更多。我的一个问题是如何制作它以便单击抽屉中的页面可以使用RelativeLayout打开一个新页面。根据我的理解，适配器只适用于视图，我是否会创建一个全新的活动，并在我的迭代中为drawerclick调用startActivity()？如果是这样，那效率如何？意味着页面加载需要很长时间吗？我的主要活动是：
public class MainActivity extends Activity {
private String[] mPages;
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
private CharSequence mDrawerTitle;
private CharSequence mTitle;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.drawer_layout);
mPages = getResources().getStringArray(R.array.page_titles);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.left_drawer);
mDrawerList.setAdapter(new ArrayAdapter<String>(this,
R.layout.drawer_list_item, mPages));
mTitle = mDrawerTitle = getTitle();
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
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) {
getActionBar().setTitle(mTitle);
}
/** Called when a drawer has settled in a completely open state. */
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(mDrawerTitle);
}
};
// Set the drawer toggle as the DrawerListener
mDrawerLayout.setDrawerListener(mDrawerToggle);
mDrawerList.setOnItemClickListener(new DrawerItemClickListener());
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
}
@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);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
private class DrawerItemClickListener implements ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
selectItem(position);
}
}
/** Swaps fragments in the main content view */
private void selectItem(int position) {
// Create a new fragment and specify the planet to show based on position
Fragment fragment;
if(position == 0){
fragment = new OneFragment();
// Insert the fragment by replacing any existing fragment
android.app.FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.content_frame, fragment)
.commit();
}
else if(position == 1){
fragment = new TwoFragment();
// Insert the fragment by replacing any existing fragment
android.app.FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.content_frame, fragment)
.commit();
}
else if(position == 2){
fragment = new ThreeFragment();
// Insert the fragment by replacing any existing fragment
android.app.FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.content_frame, fragment)
.commit();
}
else if(position == 3){
fragment = new FourFragment();
// Insert the fragment by replacing any existing fragment
android.app.FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.content_frame, fragment)
.commit();
}
// Highlight the selected item, update the title, and close the drawer
mDrawerList.setItemChecked(position, true);
setTitle(mPages[position]);
mDrawerLayout.closeDrawer(mDrawerList);
}
@Override
public void setTitle(CharSequence title) {
mTitle = title;
getActionBar().setTitle(mTitle);
}
public static class OneFragment extends Fragment{
public OneFragment(){
}
View rootView;
TextView text;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup contatiner,
Bundle savedInstanceState){
rootView = inflater.inflate(R.layout.drawer_layout,
contatiner, false);
text = (TextView)rootView.findViewById(R.id.text_view1);
text.setText("One");
return rootView;
}
}
public static class TwoFragment extends Fragment{
public TwoFragment(){
}
View rootView;
TextView text;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup contatiner,
Bundle savedInstanceState){
rootView = inflater.inflate(R.layout.drawer_layout,
contatiner, false);
text = (TextView)rootView.findViewById(R.id.text_view1);
text.setText("Two");
return rootView;
}
}
public static class ThreeFragment extends Fragment{
public ThreeFragment(){
}
View rootView;
TextView text;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup contatiner,
Bundle savedInstanceState){
rootView = inflater.inflate(R.layout.drawer_layout,
contatiner, false);
text = (TextView)rootView.findViewById(R.id.text_view1);
text.setText("Three");
return rootView;
}
}
public static class FourFragment extends Fragment{
public FourFragment(){
}
View rootView;
TextView text;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup contatiner,
Bundle savedInstanceState){
rootView = inflater.inflate(R.layout.drawer_layout,
contatiner, false);
text = (TextView)rootView.findViewById(R.id.text_view1);
text.setText("Four");
return rootView;
}
}
}
我为这个冗长的问题道歉，但开发者网站没有太多帮助，我想确保我第一次正确地做到这一点，所以我不必回去太多
答案 0 :(得分：0)
无论你想要展示什么，都需要在DrawerLayout的孩子中。在您的情况下，我认为您将在onCreate()中执行片段事务，以便将您想要的任何片段放在内容区域内。
if (savedInstanceState == null) {
fragment = new OneFragment();
// Insert the fragment by replacing any existing fragment
getFragmentManager().beginTransaction()
.replace(R.id.content_frame, fragment).commit();
}
您可以保留对这些片段的引用，这样每次用户进行选择时都不会创建它们的新实例。您可能还想确保新选择与当前选择不同，否则您将需要额外的交易。
要打开“新页面”，您需要使用startActivity()并使用自己的布局显示其他活动。一般来说，除非你专门做一些有意义的工作（比如从数据库中加载一堆数据），否则不要担心Activity需要多长时间才能加载。
最后，Adapter专门用于AdapterView s（如ListView）并且完全不同。它们与特定UI组件结合使用，以生成用于表示潜在大型数据集的子视图，并且出于效率原因可以回收这些视图。如果您想了解更多信息/清晰度，我建议您观看The World of ListView。