所以我有一个Activity及其XML文件，它们都没有与fab有关（因为我删除了fab）。然而，当我构建并运行应用程序时，仍然会出现“幽灵工厂” - 我甚至无法点击它，它只是坐在角落里，我不知道如何删除它。
的活动：
package example.com.musicapptest;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;
public class HostMainPage extends AppCompatActivity {
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {@link FragmentPagerAdapter} derivative, which will keep every
* loaded fragment in memory. If this becomes too memory intensive, it
* may be best to switch to a
* {@link android.support.v4.app.FragmentStatePagerAdapter}.
*/
private SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {@link ViewPager} that will host the section contents.
*/
private ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_host_main_page);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@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();
//noinspection SimplifiableIfStatement
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";
public PlaceholderFragment() {
}
/**
* 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;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
//Linking up values in fragment_main.xml to the MainActivity
View rootView = inflater.inflate(R.layout.fragment_host_main_page, container, false);
TextView splashTitleView = (TextView) rootView.findViewById(R.id.host_splash_title);
TextView splashBodyView = (TextView) rootView.findViewById(R.id.host_splash_body);
ProgressBar splashProgress = (ProgressBar) rootView.findViewById(R.id.host_splash_progres);
Button hostButton = (Button) rootView.findViewById(R.id.host_start_button);
hostButton.setVisibility(View.GONE);
/*
Setting up which splash page will be displayed as the user progresses throughout the welcome splash page
*/
if (getArguments().getInt(ARG_SECTION_NUMBER) == 1) {
splashTitleView.setText("Host Welcome");
splashBodyView.setText("Filler Text");
splashProgress.setProgress(20);
} else if (getArguments().getInt(ARG_SECTION_NUMBER) == 2) {
splashTitleView.setText("Create a Party ID");
splashBodyView.setText("Filler Text");
splashProgress.setProgress(40);
} else if (getArguments().getInt(ARG_SECTION_NUMBER) == 3) {
splashTitleView.setText("People Joint");
splashBodyView.setText("Filler Text");
splashProgress.setProgress(60);
} else if (getArguments().getInt(ARG_SECTION_NUMBER) == 4) {
splashTitleView.setText("Vote, Suggest, or View Leaderboards");
splashBodyView.setText("Filler Text");
splashProgress.setProgress(80);
}
else if (getArguments().getInt(ARG_SECTION_NUMBER) == 5) {
hostButton.setVisibility(View.VISIBLE);
splashTitleView.setText("Start Hosting");
splashBodyView.setText("Filler Text");
splashProgress.setProgress(100);
}
//Default frag if for some reason there is an IndexOutOfBoundsException()
else {
splashTitleView.setText("Get Started Fragment");
splashBodyView.setText("Filler Text");
splashProgress.setProgress(100);
}
return rootView;
}
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
return PlaceholderFragment.newInstance(position + 1);
}
@Override
public int getCount() {
// Show 5 total pages.
return 5;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "SECTION 1";
case 1:
return "SECTION 2";
case 2:
return "SECTION 3";
case 3:
return "SECTION 4";
case 4:
return "SECTION 5";
}
return null;
}
}
}
和XML：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="example.com.musicapptest.HostMainPage$PlaceholderFragment">
<TextView
android:id="@+id/host_splash_title"
android:layout_width="300dp"
android:layout_height="100dp"
android:gravity="center"
android:layout_marginTop="22dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"/>
<TextView
android:layout_width="500dp"
android:layout_height="100dp"
android:gravity="center"
android:textAppearance="?android:attr/textAppearanceMedium"
android:id="@+id/host_splash_body"
android:layout_below="@id/host_splash_title"
android:layout_centerHorizontal="true"
android:layout_alignParentEnd="true"
android:layout_marginTop="20dp" />
<ProgressBar
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="300dp"
android:layout_height="wrap_content"
android:id="@+id/host_splash_progres"
android:layout_marginTop="48dp"
android:layout_below="@+id/host_splash_body"
android:layout_alignStart="@+id/host_splash_title" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/host_start_button"
android:id="@+id/host_start_button"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="68dp" />
</RelativeLayout>
以下是我参考的图片：
谢谢！
答案 0 :(得分：0)
您正在查看错误的布局XML文件。您正在布局中找到工具栏：
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
但您粘贴的布局中没有工具栏。您必须有另一个名为activity_host_main_page.xml的布局文件，其中包含FAB。