如題我在製作導覽列時,
add和hide不給我放我new的fragment,實在想不出原因,
請各位大大告訴我
package com.example.test;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.BottomNavigationView;
import android.support.v7.app.AppCompatActivity;
import android.view.MenuItem;
import android.widget.TextView;
import com.example.test.home_Fragment;
import com.example.test.live_fragment;
import com.example.test.car_fragment;
import com.example.test.notify_fragment;
import com.example.test.set_fragment;
public class MainActivity extends AppCompatActivity {
private TextView mTextMessage;
private home_Fragment homef;
private live_fragment livef;
private car_fragment carf;
private notify_fragment notifyf;
private set_fragment setf;
private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
= new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.navigation_home:
mTextMessage.setText(R.string.title_home);
return true;
case R.id.navigation_live:
mTextMessage.setText("live");
return true;
case R.id.navigation_car:
mTextMessage.setText("car");
return true;
case R.id.navigation_notifications:
mTextMessage.setText("notification");
return true;
case R.id.navigation_setting:
mTextMessage.setText("setting");
return true;
}
return false;
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initial();
mTextMessage = (TextView) findViewById(R.id.message);
BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);
navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
}
//初始化fragment
private void initial()
{
homef = new home_Fragment();
carf = new car_fragment();
livef = new live_fragment();
notifyf = new notify_fragment();
setf = new set_fragment();
FragmentTransaction itfragment = getFragmentManager().beginTransaction();
itfragment.add(R.id.content,homef).add(R.id.content,carf).add(R.id.content,livef).add(R.id.content,notifyf)
.add(R.id.content,setf);
itfragment.hide(homef).hide(carf).hide(livef);//隐藏fragment
itfragment.addToBackStack(null);
itfragment.commit();
}
}