警告第一个参数发现类型MapActivity必需的android.support.v4.app.Fragment

嗨，我是新来的，希望能找到帮助。。。 我发现一条消息“warning 1st argument found type MapActivity required android.support.v4.app.Fragment”我想将活动映射为片段，因为我想在视图页面中添加映射。我使用的是View Pager和View Pager Adapter以及in-View Pager Adapter，我使用的是两个数组列表，用于片段和选项卡标题

这是ViewPagerAdapter的代码

public class ViewPagerAdapter extends FragmentPagerAdapter {

ArrayList<Fragment> fragments = new ArrayList<>();
ArrayList<String> tabTitles = new ArrayList<>();

public void addFragments(Fragment fragments, String titles)
{
    this.fragments.add(fragments);
    this.tabTitles.add(titles);
}

public ViewPagerAdapter(FragmentManager fm)
{
    super(fm);
}

@Override
public Fragment getItem(int position) {
    return fragments.get(position);
}

@Override
public int getCount() {
    return tabTitles.size();
}


@Override
public CharSequence getPageTitle(int position) {
    return tabTitles.get(position);
}
}

在activity_main.xml中

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"

tools:context="com.example.lilla.tabdemo.MainActivity">

<android.support.design.widget.AppBarLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    >

    <include

        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        layout="@layout/toolbar_layout"

        />
    <android.support.design.widget.TabLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/tabLayout"
        app:tabMode="fixed"
        app:tabGravity="fill"
        >

    </android.support.design.widget.TabLayout>

</android.support.design.widget.AppBarLayout>

<android.support.v4.view.ViewPager
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/viewPager"
    >

</android.support.v4.view.ViewPager>

</RelativeLayout>

---

您的MapsActivity类必须扩展Fragment类，并且Fragment类必须从 android.support.v4.app.Fragment包

尝试以下课程：

public class MapsActivity extends Fragment implements 
OnMapReadyCallback {

private GoogleMap mMap;
private MapView mMapView;

 @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.activity_maps, container, false);
        getActivity().setTitle("Map");
        mMapView = (MapView) v.findViewById(R.id.map);
        mMapView.onCreate(savedInstanceState);
        mMapView.getMapAsync(this); //this is important
        return v;
    }
  @Override
    public void onResume() {
        super.onResume();
        mMapView.onResume();
    }

    @Override
    public void onPause() {
        super.onPause();
        mMapView.onPause();
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        mMapView.onDestroy();
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        mMapView.onSaveInstanceState(outState);
    }

    @Override
    public void onLowMemory() {
        super.onLowMemory();
        mMapView.onLowMemory();
    }

@Override
public void onMapReady(GoogleMap googleMap) {
    mMap = googleMap;

    // Add a marker in Sydney and move the camera
    LatLng sydney = new LatLng(-34, 151);
    mMap.addMarker(new MarkerOptions().position(sydney).title("Marker"));
    mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
}
}

---

发布您的

MapsActivity

code…查看链接副本答案中的

MapFragment

类。这是您应该使用的，而不是

MapsActivity

类。MapsActivity类扩展FragmentActivity如果我在extends Fragment中更改它，则我会出现更多错误，例如无法解析方法集ContentView，也无法解析方法getSupportFragmentManager；您需要共享Mapsactivity代码，以便我可以建议更改我编辑的帖子请检查it@TahirLilla试试这个代码谢谢兄弟现在我学习了这个代码并做出了改变感谢所有人，上帝保佑你们所有人

package com.example.lilla.tabdemo;

import android.support.v4.app.FragmentActivity;
import android.os.Bundle;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

public class MapsActivity extends FragmentActivity implements 
OnMapReadyCallback {

private GoogleMap mMap;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_maps);
SupportMapFragment mapFragment = (SupportMapFragment) 
getSupportFragmentManager()
            .findFragmentById(R.id.map);
    mapFragment.getMapAsync(this);
}


@Override
public void onMapReady(GoogleMap googleMap) {
    mMap = googleMap;

    // Add a marker in Sydney and move the camera
    LatLng sydney = new LatLng(-34, 151);
    mMap.addMarker(new MarkerOptions().position(sydney).title("Marker"));
    mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
}
}

public class MapsActivity extends Fragment implements 
OnMapReadyCallback {

private GoogleMap mMap;
private MapView mMapView;

 @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.activity_maps, container, false);
        getActivity().setTitle("Map");
        mMapView = (MapView) v.findViewById(R.id.map);
        mMapView.onCreate(savedInstanceState);
        mMapView.getMapAsync(this); //this is important
        return v;
    }
  @Override
    public void onResume() {
        super.onResume();
        mMapView.onResume();
    }

    @Override
    public void onPause() {
        super.onPause();
        mMapView.onPause();
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        mMapView.onDestroy();
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        mMapView.onSaveInstanceState(outState);
    }

    @Override
    public void onLowMemory() {
        super.onLowMemory();
        mMapView.onLowMemory();
    }

@Override
public void onMapReady(GoogleMap googleMap) {
    mMap = googleMap;

    // Add a marker in Sydney and move the camera
    LatLng sydney = new LatLng(-34, 151);
    mMap.addMarker(new MarkerOptions().position(sydney).title("Marker"));
    mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
}
}