Android 在使用NavigatorDrawer时,如何从一个片段或活动更改为另一个片段或活动?
对不起,我的问题比我问的要复杂。我对Java和Android还不熟悉,整个NavigationDrawer的事情让我很沮丧,但我决心要弄明白。我从Android下载了带有nav drawer示例的示例代码,并删除和添加了一些细微的更改以适应首选项。基本上,使用提供给我的代码,我不知道如何更改为不同的活动/片段。我应该使用如示例所示的另一个片段,还是需要创建一个扩展意图的新Java类并创建相应的xml布局?一旦确定了,我是否在创建的片段类中创建一个切换案例,以循环通过其相应的片段/活动?还是在selectItem()方法中放置开关大小写?我已经在这个问题上工作了8天了,在用尽所有资源后,我终于决定寻求帮助。谢谢你的帮助。再说一次,我不是在找人为我编码,我只需要帮助我理解我提出的问题,以及我的代码需要放在哪里Android 在使用NavigatorDrawer时,如何从一个片段或活动更改为另一个片段或活动?,android,android-intent,android-activity,android-fragments,Android,Android Intent,Android Activity,Android Fragments,对不起,我的问题比我问的要复杂。我对Java和Android还不熟悉,整个NavigationDrawer的事情让我很沮丧,但我决心要弄明白。我从Android下载了带有nav drawer示例的示例代码,并删除和添加了一些细微的更改以适应首选项。基本上,使用提供给我的代码,我不知道如何更改为不同的活动/片段。我应该使用如示例所示的另一个片段,还是需要创建一个扩展意图的新Java类并创建相应的xml布局?一旦确定了,我是否在创建的片段类中创建一个切换案例,以循环通过其相应的片段/活动?还是在se
public class MainActivity extends Activity {
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
private CharSequence mDrawerTitle;
private CharSequence mTitle;
private String[] choices;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTitle = mDrawerTitle = getTitle();
choices = getResources().getStringArray(R.array.choices_array);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.left_drawer);
// set a custom shadow that overlays the main content when the drawer opens
mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
// set up the drawer's list view with items and click listener
mDrawerList.setAdapter(new ArrayAdapter<String>(this,
R.layout.drawer_list_item, choices));
mDrawerList.setOnItemClickListener(new DrawerItemClickListener());
// enable ActionBar app icon to behave as action to toggle nav drawer
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
// ActionBarDrawerToggle ties together the the proper interactions
// between the sliding drawer and the action bar app icon
mDrawerToggle = new ActionBarDrawerToggle(
this, /* host Activity */
mDrawerLayout, /* DrawerLayout object */
R.drawable.ic_drawer, /* nav drawer image to replace 'Up' caret */
R.string.drawer_open, /* "open drawer" description for accessibility */
R.string.drawer_close /* "close drawer" description for accessibility */
) {
public void onDrawerClosed(View view) {
getActionBar().setTitle(mTitle);
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
}
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(mDrawerTitle);
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null) {
selectItem(0);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
return super.onCreateOptionsMenu(menu);
}
/* Called whenever we call invalidateOptionsMenu() */
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// If the nav drawer is open, hide action items related to the content view
boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
menu.findItem(R.id.action_websearch).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// The action bar home/up action should open or close the drawer.
// ActionBarDrawerToggle will take care of this.
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
// Handle action buttons
/*
switch(item.getItemId()) {
case R.id.action_websearch:
// create intent to perform web search for this planet
Intent intent = new Intent(Intent.ACTION_WEB_SEARCH);
intent.putExtra(SearchManager.QUERY, getActionBar().getTitle());
// catch event that there's no activity to handle intent
if (intent.resolveActivity(getPackageManager()) != null) {
startActivity(intent);
} else {
Toast.makeText(this, R.string.app_not_available, Toast.LENGTH_LONG).show();
}
return true;
default:
return super.onOptionsItemSelected(item);
}*/
return super.onOptionsItemSelected(item);
}
/* The click listener for ListView in the navigation drawer */
private class DrawerItemClickListener implements ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
selectItem(position);
}
}
private void selectItem(int position) {
// update the main content by replacing fragments
Fragment fragment = new ChoicesFragment();
Bundle args = new Bundle();
args.putInt(ChoicesFragment.ARG_CHOICES_NUMBER, position);
fragment.setArguments(args);
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
setTitle(choices[position]);
mDrawerLayout.closeDrawer(mDrawerList);
}
@Override
public void setTitle(CharSequence title) {
mTitle = title;
getActionBar().setTitle(mTitle);
}
/**
* When using the ActionBarDrawerToggle, you must call it during
* onPostCreate() and onConfigurationChanged()...
*/
@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);
// Pass any configuration change to the drawer toggle
mDrawerToggle.onConfigurationChanged(newConfig);
}
/**
* Fragment that appears in the "content_frame", shows its appropriate layout
*/
public static class ChoicesFragment extends Fragment {
public static final String ARG_CHOICES_NUMBER = "planet_number";
public ChoicesFragment() {
// Empty constructor required for fragment subclasses
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.image_view_fragment, container, false);
int i = getArguments().getInt(ARG_CHOICES_NUMBER);
String available_choices = getResources().getStringArray(R.array.choices_array)[i];
int imageId = getResources().getIdentifier(available_choices.toLowerCase(Locale.getDefault()),
"drawable", getActivity().getPackageName());
((ImageView) rootView.findViewById(R.id.image)).setImageResource(imageId);
getActivity().setTitle(available_choices);
return rootView;
}
}// end ChoicesFragment class
}// end MainActivity
公共类MainActivity扩展活动{
私人抽屉布局mDrawerLayout;
私有列表视图mDrawerList;
私有操作bardrawertoggle mDrawerToggle;
私有字符序列mDrawerTitle;
私有字符序列mTitle;
私有字符串[]选项;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTitle=mDrawerTitle=getTitle();
choices=getResources().getStringArray(R.array.choices\u数组);
mDrawerLayout=(抽屉布局)findViewById(R.id.抽屉布局);
mDrawerList=(ListView)findViewById(R.id.left\u抽屉);
//设置抽屉打开时覆盖主要内容的自定义阴影
mDrawerLayout.setDrawerShadow(R.drawable.drawer\u shadow,GravityCompat.START);
//使用项目设置抽屉的列表视图,然后单击listener
mDrawerList.setAdapter(新阵列适配器,
R.layout.drawer_list_item,choices));
setOnItemClickListener(新的DrawerItemClickListener());
//启用ActionBar应用程序图标作为切换导航抽屉的操作
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
//ActionBarDrawerToggle将适当的交互连接在一起
//在滑动抽屉和操作栏应用程序图标之间
mDrawerToggle=新操作bardrawertoggle(
此,/*主机活动*/
mDrawerLayout,/*抽屉布局对象*/
R.drawable.ic_抽屉,/*导航抽屉图像替换“Up”插入符号*/
R.string.drawer\u open,/*“open drawer”描述,用于辅助功能*/
R.string.drawer\u close/*“close drawer”可访问性说明*/
) {
公共无效onDrawerClosed(视图){
getActionBar().setTitle(mTitle);
InvalidateOptions SMenu();//创建对OnPrepareOptions SMenu()的调用
}
打开图纸上的公共空白(视图抽屉视图){
getActionBar().setTitle(mDrawerTitle);
InvalidateOptions SMenu();//创建对OnPrepareOptions SMenu()的调用
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
如果(savedInstanceState==null){
选择项目(0);
}
}
@凌驾
公共布尔onCreateOptions菜单(菜单){
MenuInflater充气机=getMenuInflater();
充气机。充气(右菜单。主菜单,菜单);
返回super.onCreateOptions菜单(菜单);
}
/*调用InvalidateOptions菜单()时调用*/
@凌驾
公共布尔值OnPrepareOptions菜单(菜单){
//如果导航抽屉打开,则隐藏与内容视图相关的操作项
boolean-DrawerLayout=mDrawerLayout.isDrawerOpen(mDrawerList);
menu.findItem(R.id.action_websearch).setVisible(!drawerropen);
返回super.onPrepareOptions菜单(菜单);
}
@凌驾
公共布尔值onOptionsItemSelected(菜单项项){
//操作栏home/up操作应打开或关闭抽屉。
//ActionBarDrawerToggle会处理好的。
如果(MDRAWERTOGLE.onOptionsItemSelected(项目)){
返回true;
}
//手柄动作按钮
/*
开关(item.getItemId()){
案例R.id.action_网站搜索:
//创建对这个星球执行web搜索的意图
意向意向=新意向(意向.行动\网络\搜索);
intent.putExtra(SearchManager.QUERY,getActionBar().getTitle());
//捕获没有可处理的活动的事件
if(intent.resolveActivity(getPackageManager())!=null){
星触觉(意向);
}否则{
Toast.makeText(this,R.string.app_不可用,Toast.LENGTH_LONG.show();
}
返回true;
违约:
返回super.onOptionsItemSelected(项目);
}*/
返回super.onOptionsItemSelected(项目);
}
/*在导航抽屉中单击ListView的侦听器*/
私有类DrawerItemClickListener实现ListView.OnItemClickListener{
@凌驾
public void onItemClick(AdapterView父对象、视图、整型位置、长id){
选择项目(位置);
}
}
私有void selectItem(内部位置){
//通过替换片段更新主要内容
Fragment Fragment=新选项Fragment();
Bundle args=新Bundle();
args.putInt(ChoicesFragment.ARG\u选项\u编号、位置
...
fragmentManager.beginTransaction().replace(R.id.content_frame, redFragment).commit();
...