我的活动包含NavigationDrawer。当按下导航抽屉中的项目时，我需要更改该活动中的Fragments。我在替换片段时出错。
package in.yusoft.yuride.yuride;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.content.Context;
import android.support.v4.app.Fragment;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class HomeActivity extends AppCompatActivity implements AdapterView.OnItemClickListener {
DrawerLayout drawer_layout;
ListView drawer_list;
ActionBarDrawerToggle drawer_toggle;
ActionBar abar;
Myadapter myAdapter;
android.support.v4.app.FragmentManager fm;
android.support.v4.app.FragmentTransaction ft;
Fragment def_frag,about_us,cancel_ride,fares,profile,ride_history,ride_updates,success,your_places;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
def_frag=new Success();
fm=getSupportFragmentManager();
ft=fm.beginTransaction();
ft.replace(R.id.home_fragment, new CancelRide());
ft.commitAllowingStateLoss();;
myAdapter=new Myadapter(this);
drawer_layout = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer_layout.addDrawerListener(drawer_toggle);
drawer_list = (ListView) findViewById(R.id.drawer_list);
drawer_list.setAdapter(myAdapter);
//Swtting drawer width
int width = getResources().getDisplayMetrics().widthPixels/2;
DrawerLayout.LayoutParams params = (android.support.v4.widget.DrawerLayout.LayoutParams) drawer_list.getLayoutParams();
params.width = width;
drawer_list.setLayoutParams(params);
drawer_list.setOnItemClickListener(this);
abar = getSupportActionBar();
drawer_toggle = new ActionBarDrawerToggle(this, drawer_layout, R.string.app_name, R.string.app_name) {
//** Called when a drawer has settled in a completely closed state. *//*
public void onDrawerClosed(View view) {
super.onDrawerClosed(view);
getActionBar().setTitle("Drawer Opened");
invalidateOptionsMenu();
}
//** Called when a drawer has settled in a completely open state. *//*
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
getActionBar().setTitle("Drawer Closed");
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
}
};
drawer_toggle.syncState();
if (abar != null)
{
abar.setHomeButtonEnabled(true);
abar.setDisplayHomeAsUpEnabled(true);
}
}
@Override
public boolean onOptionsItemSelected(android.view.MenuItem item) {
return drawer_toggle.onOptionsItemSelected(item);
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Object o = drawer_list.getItemAtPosition(position);
Toast.makeText(HomeActivity.this, ""+o.toString(), Toast.LENGTH_SHORT).show();
ft=fm.beginTransaction();
switch (position)
{
case 0:
ft.replace(R.id.home_fragment,new Profile()).addToBackStack(null).commit();
break;
case 1:
ft.replace(R.id.home_fragment,new RideHistory()).addToBackStack(null).commit();
break;
case 3:
ft.replace(R.id.home_fragment,new Fares()).addToBackStack(null).commit();
break;
case 4:
ft.replace(R.id.home_fragment,new YourPlaces()).addToBackStack(null).commit();
break;
case 6:
ft.replace(R.id.home_fragment,new CancelRide()).addToBackStack(null).commit();
break;
case 7:
ft.replace(R.id.home_fragment,new RideUpdates()).addToBackStack(null).commit();
break;
case 8:
ft.replace(R.id.home_fragment,new AboutUs()).addToBackStack(null).commit();
break;
}
}
class Myadapter extends BaseAdapter
{
Context context;
String[] drawer_items;
public Myadapter(Context context)
{
this.context=context;
drawer_items=context.getResources().getStringArray(R.array.drawer_items);
}
@Override
public int getCount() {
return drawer_items.length;
}
@Override
public Object getItem(int position) {
return drawer_items[position];
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row=null;
if(convertView==null)
{
LayoutInflater inflater= (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row=inflater.inflate(R.layout.drawer_row,parent,false);
}
else
{
row=convertView;
}
ImageView drawer_icon= (ImageView) row.findViewById(R.id.drawer_icon);
TextView drawer_text= (TextView) row.findViewById(R.id.drawer_text);
drawer_text.setText(drawer_items[position]);
drawer_icon.setImageResource(R.drawable.tick);
return row;
}
}
}
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/drawer_layout">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/home_fragment">
</FrameLayout>
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="left"
android:id="@+id/drawer_list"
android:background="@color/blue_normal">
</ListView>
</android.support.v4.widget.DrawerLayout>
FATAL EXCEPTION: main
Process: in.yusoft.yuride.yuride, PID: 2813
java.lang.RuntimeException: in.yusoft.yuride.yuride.HomeActivity@f1cb3b3 must implement OnFragmentInteractionListener
at in.yusoft.yuride.yuride.Profile.onAttach(Profile.java:83)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1019)
at android.support.v4.app.BackStackRecord.ensureFragmentsAreInitialized(BackStackRecord.java:1081)
at android.support.v4.app.BackStackRecord.beginTransition(BackStackRecord.java:1036)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:662)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1617)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:517)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:6066)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:770)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:660)
答案 0 :(得分：1)
您可以实施FragmentDrawer.FragmentDrawerListener来解决产生的错误....您也可以这样做......
//when navigation item is selected by user
@Override
public void onDrawerItemSelected(View view, int position) {
displayView(position);
}
public void displayView(int position) {
String title = getString(R.string.app_name);
switch (position) {
case 0:
fragment = new fragment1();
break;
case 1:
fragment = new fragment2();
break;
case 2:
fragment = new fragment3();
break;
case 3:
//and so on....
default:
break;
}
if (fragment != null) {
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.container_body, fragment).addToBackStack("fragBack");
fragmentTransaction.commit();
}
}
答案 1 :(得分：1)
请尝试
case 4:
yourIntent = new Intent(HomeActivity.this, NextActivity.class);
startActivity(yourIntent);
break;
答案 2 :(得分：0)
如果您自动生成了片段代码，那么它有一个默认的回调接口OnFragmentInteractionListener，您需要在活动中实现数据共享或其他目的。
请为您的活动中的每个片段实施YourFragmentName.OnFragmentInteractionListener。
希望这会奏效!!