[英]Fragment error in android navigation drawer
您好,我多次遇到表達式預期錯誤,而且我不知道我在做什么錯,如果有人可以幫助我,那會很棒。 謝謝。
import android.support.v4.app.Fragment;
import android.app.Activity;
import android.app.ActionBar;
import android.app.FragmentManager;
import android.content.Context;
import android.os.Build;
import android.os.Bundle;
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.support.v4.widget.DrawerLayout;
import android.widget.ArrayAdapter;
import android.widget.TextView;
public class MainActivity extends Activity
implements NavigationDrawerFragment.NavigationDrawerCallbacks {
/**
* Fragment managing the behaviors, interactions and presentation of the navigation drawer.
*/
private NavigationDrawerFragment mNavigationDrawerFragment;
/**
* Used to store the last screen title. For use in {@link #restoreActionBar()}.
*/
private CharSequence mTitle;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mNavigationDrawerFragment = (NavigationDrawerFragment)
getFragmentManager().findFragmentById(R.id.navigation_drawer);
mTitle = getTitle();
// Set up the drawer.
mNavigationDrawerFragment.setUp(
R.id.navigation_drawer,
(DrawerLayout) findViewById(R.id.drawer_layout));
}
@Override
public void onNavigationDrawerItemSelected(int position) {
// update the main content by replacing fragments
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.container, Fragment) //expression expected error on "Fragment"
.commit();
}
public void onSectionAttached(int position) {
switch (position) {
case 1:
Fragment = new Welcome(); //expression expected error on "Fragment"
break;
case 2:
Fragment = new Tutorials(); //expression expected error on "Fragment"
break;
case 3:
Fragment = new Blueprints(); //expression expected error on "Fragment"
break;
case 4:
Fragment = new Wiki(); //expression expected error on "Fragment"
break;
case 5:
Fragment = new Chat(); //expression expected error on "Fragment"
break;
case 6:
Fragment = new Item_Search(); //expression expected error on "Fragment"
break;
case 7:
Fragment = new Recipes(); //expression expected error on "Fragment"
break;
case 8:
Fragment = new Wallpaper(); //expression expected error on "Fragment"
break;
case 9:
Fragment = new Maps_Mods(); //expression expected error on "Fragment"
break;
default :
break;
}
}
public void restoreActionBar() {
ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
actionBar.setDisplayShowTitleEnabled(true);
actionBar.setTitle(mTitle);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
if (!mNavigationDrawerFragment.isDrawerOpen()) {
// Only show items in the action bar relevant to this screen
// if the drawer is not showing. Otherwise, let the drawer
// decide what to show in the action bar.
getMenuInflater().inflate(R.menu.main, menu);
restoreActionBar();
return true;
}
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
TextView textView = (TextView) rootView.findViewById(R.id.section_label);
textView.setText(Integer.toString(getArguments().getInt(ARG_SECTION_NUMBER)));
return rootView;
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
((MainActivity) activity).onSectionAttached(
getArguments().getInt(ARG_SECTION_NUMBER));
}
}
}
該錯誤強調“片段”。 我正在嘗試將導航抽屜縫到不同的片段。
它應該是
fragmentManager.beginTransaction()
.replace(R.id.container,new Welcome())
和
Welcome fragment = new Welcome();
其他人也一樣。
由於您正在使用基於支持的片段。 你需要改變這個
public class MainActivity extends Activity
至
public class MainActivity extends ActionBarActivity
如果需要ActionBar
。 您還需要使用AppCompat
。
檢查一下
片段是一個關鍵詞。 您需要的是Fragment類型的變量。 因此,例如,將其與mTitle放在同一部分:
Fragment mFragment = null;
在您的switch語句中,例如,輸入:
mFragment = new Welcome();
然后,在設置交易時,您可以輸入:
fragmentManager.beginTransaction()
.replace(R.id.container, mFragment)
這可能無法解決您所有的問題,但是應該使您克服這些編譯錯誤。
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