我在手机上使用 AIDE，并尝试从应用程序内的导航抽屉中打开一个片段，但是当我尝试构建应用程序时出现此错误：
An instance of type 'android.app.fragmenttransaction' cannot be assigned to a variable of type 'android.support.v4.app.fragmenttransaction'
这是 MainActivity.Java 文件中的代码：
package com.nickdgreen.net.act1;
import android.content.*;
import android.content.res.*;
import android.os.*;
import android.support.v4.app.*;
import android.support.v4.widget.*;
import android.view.*;
import android.widget.*;
import android.app.ActionBar.*;
import android.app.Activity.*;
import android.content.res.Configuration.*;
import android.os.Bundle.*;
import android.support.v4.app.ActionBarDrawerToggle.*;
import android.support.v4.app.Fragment.*;
import android.support.v4.app.FragmentActivity.*;
import android.support.v4.app.FragmentManager.*;
import android.support.v4.app.FragmentTransaction.*;
import android.support.v4.widget.DrawerLayout.*;
import android.view.Menu.*;
import android.view.MenuInflater.*;
import android.view.MenuItem.*;
import android.view.View.*;
import android.widget.AdapterView.*;
import android.widget.ArrayAdapter.*;
import android.widget.ListView.*;
public class MainActivity extends FragmentActivity
{
private ActionBarDrawerToggle drawerToggle;
final String fragments[] = {
"com.nickdgreen.net.act1.MainFragment",
"com.nickdgreen.net.act1.OneFragment",
"com.nickdgreen.net.act1.TwoFragment",
"com.nickdgreen.net.act1.ThreeFragment",
};
final String menuEntries[] = {
"Main", "One", "Two", "Three"
};
public MainActivity()
{
}
public void onConfigurationChanged(Configuration configuration)
{
super.onConfigurationChanged(configuration);
drawerToggle.onConfigurationChanged(configuration);
}
protected void onCreate(Bundle bundle)
{
super.onCreate(bundle);
setContentView(0x7f030000);
ArrayAdapter arrayadapter = new ArrayAdapter(getActionBar().getThemedContext(), 0x1090003, menuEntries);
final DrawerLayout drawer = (DrawerLayout)findViewById(0x7f080000);
final ListView navList = (ListView)findViewById(0x7f080002);
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
drawerToggle = new ActionBarDrawerToggle(this, drawer, 0x7f020000, 0x7f050003, 0x7f050002) {
final MainActivity this$0;
public void onDrawerClosed(View view)
{
}
public void onDrawerOpened(View view)
{
}
{
this$0 = MainActivity.this;
}
};
drawer.setDrawerListener(drawerToggle);
navList.setAdapter(arrayadapter);
navList.setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener() {
final MainActivity this$0;
final DrawerLayout val$drawer;
final ListView val$navList;
public void onItemClick(AdapterView adapterview, View view, int i, long l)
{ {
}
drawer.closeDrawer(navList);
}
{
}
});
FragmentTransaction fragmenttransaction = getSupportFragmentManager().beginTransaction();
fragmenttransaction.replace(0x7f080001, Fragment.instantiate(this, fragments[0]));
fragmenttransaction.commit();
}
public boolean onCreateOptionsMenu(Menu menu)
{
getMenuInflater().inflate(0x7f070000, menu);
return true;
}
public boolean onOptionsItemSelected(MenuItem menuitem)
{
if (drawerToggle.onOptionsItemSelected(menuitem))
{
return true;
} else
{
return super.onOptionsItemSelected(menuitem);
}
}
protected void onPostCreate(Bundle bundle)
{
super.onPostCreate(bundle);
drawerToggle.syncState();}
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) {
//Fragment fragment = new PlanetFragment(); Bundle args = new Bundle(); // args.putInt(PlanetFragment.ARG_PLANET_NUMBER, position);
Intent intent = new Intent(MainActivity.this, OneFragment.class); startActivity(intent); } }
public class
ProductListActivity extends MainActivity {
@Override
public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
// Inflate main_menu.xml
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case R.id.mainMenuAbout:
Intent intent = new Intent(this, AboutActivity.class);
startActivity(intent);
return true;
case R.id.mainMenuExit:
finish();
return true;
}
return super.onOptionsItemSelected(item);
}
@Override public void onClick(Bundle b) { super.onCreate(b); setContentView(R.layout.primary);}
public void
selectItem(int position) {
Fragment newFragment;
FragmentTransaction transaction = getFragmentManager().beginTransaction();
switch (position) {
case 0:
newFragment = new OneFragment();
transaction.replace(R.id.content_frame, newFragment);
transaction.addToBackStack(null); transaction.commit();
break;
case 1:
newFragment = new TwoFragment();
transaction.replace(R.id.content_frame, newFragment);
transaction.addToBackStack(null);
transaction.commit();
break;
case 2:
newFragment = new ThreeFragment();
transaction.replace(R.id.content_frame, newFragment);
transaction.addToBackStack(null);
transaction.commit();
break;
case 3:
newFragment = new FourFragment();
transaction.replace(R.id.content_frame, newFragment);
transaction.addToBackStack(null);
transaction.commit();
break;
}
//DrawerList.setItemChecked(position, true);
CharSequence[] ListTitles = null;
setTitle(ListTitles[position]);
View DrawerList = null;
}
}
}