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我有一个开放片段活动的问题，我是新的编程Android设备，但我认为这是非常有趣的，我想为自己做一些应用程序。
我有一个滑动菜单样本，它的一切工作，所以我有三个列表项目（家庭，设置，约）我想打开一个活动，当我按下其中一个这是我的mainActivity，这将是如果有人告诉我该如何完成该代码才能打开其他活动，那该多好啊！ 预先感谢您。如何从导航抽屉列表中打开片段
我的MainActivity是：
public class MainActivity extends BaseActivity {
FragmentStackManager fm, sliding_menu;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setUpView();
menuToggeleSetUp(savedInstanceState);
}
void setUpView() {
fm = new FragmentStackManager(this);
sliding_menu = new FragmentStackManager(this);
drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
fm.addFragment(new MainFragment(), R.id.main_frame, false, FragmentTransaction.TRANSIT_NONE, false);
sliding_menu.addFragment(new SlidingMenuFragment(), R.id.slide_fragment, false, FragmentTransaction.TRANSIT_NONE, false);
}
void menuToggeleSetUp(Bundle savedInstanceState) {
mDrawerToggle = new ActionBarDrawerToggle(this, drawer,
R.drawable.ic_drawer, // nav menu toggle icon
R.string.app_name
) {
public void onDrawerClosed(View view) {
getSupportActionBar().setTitle(mTitle);
invalidateOptionsMenu();
}
public void onDrawerOpened(View drawerView) {
getSupportActionBar().setTitle(mDrawerTitle);
invalidateOptionsMenu();
}
};
drawer.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null) {
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
mDrawerToggle.syncState();
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
if (id == R.id.action_settings) {
System.out.println("CLEAR SETTINGS STARTED");
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
mDrawerToggle.onConfigurationChanged(newConfig);
}
}
感谢你的帮助 BU我想保持这一个，因为汉堡动画，所以我找到了，我完成了我的代码，但得到了一个错误在logcat的 如果有人要帮我，这将是巨大的 因此，我所做的是：
mDrawerList.setOnItemClickListener(new DrawerItemClickListener());
private class DrawerItemClickListener implements ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView parent, View view, int position, long id) {
updateDisplay(position);
}
}
private void updateDisplay(int position) {
Fragment fragment = null;
switch (position) {
case 0:
System.out.println("ACTIVITY ONE");
//fragment = new Home_Fragment();
break;
case 1:
//fragment = new Settings_Fragment();
System.out.println("ACTIVITY TWO");
// startActivity(new Intent(this, Preferences.class));
break;
//case 2:
// fragment = new TB_Fragment();
//break;
default:
break;
}
if (fragment != null) {
android.app.FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().replace(R.id.frame_container, fragment).commit();
// update selected item and title, then close the drawer
//setTitle(menutitles[position]);
drawer.closeDrawer(mDrawerList);
} else {
// error in creating fragment
Log.e("MainActivity", "Error in creating fragment");
}
的我logc在是
了java.lang.RuntimeException：无法启动活动ComponentInfo {com.intelligent_screen/com.intelligent.screen.View.MainActivity}：显示java.lang.NullPointerException：尝试调用虚拟方法“无效机器人。 widget.ListView.setOnItemClickListener（android.widget.AdapterView $ OnItemClickListener）”上的空对象引用