Google Maps API v2自定义MapFragment + SimpleFragment

时间:2013-01-22 12:19:08

标签: android android-fragments google-maps-api-2 currentlocation mapfragment

我需要创建一个包含的简单应用程序 1.自定义MapFragment,它可以显示当前位置(LocationListener?),两个标记等。 2.简单的空碎片。

应用程序不得使用支持v4(sdk 11+)/ FragmentActivity。

清空片段。

XML:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/black" >
</RelativeLayout>

类别:

public class FirstFragment extends Fragment{

public FirstFragment() {
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.first_fragment, container, false);
    return view;
}
}

映射片段(尝试使其成为单例)。

XML:

<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/map"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  class="com.google.android.gms.maps.MapFragment"/>

public class ThirdMapFragment extends MapFragment {
public static MapFragment instance;

@Override
public View onCreateView(LayoutInflater arg0, ViewGroup arg1, Bundle arg2) {
    View view;
    view = arg0.inflate(R.layout.map_fragment, arg1, false);
    return view;
}

public static MapFragment getInstance() {
    if (instance == null) {
        instance = newInstance();
    }
    // NullPointerException in getMap() ???
    // instance.getMap().addMarker(new MarkerOptions().position(new LatLng(41.1, 39)));
    return instance;
}

@Override
public void onCreate(Bundle arg0) {
    super.onCreate(arg0);
}
}

主要活动:

public class ActivityMain extends Activity implements OnClickListener {
FragmentManager fragmentManager;
FragmentTransaction transaction;
FirstFragment firstFragment;
MapFragment mapFragment;

// Buttons
Button b4;

int i = 0;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    fragmentManager = getFragmentManager();
    transaction = fragmentManager.beginTransaction();

    b4 = (Button) findViewById(R.id.button4);

    b1.setOnClickListener(this);

    firstFragment = new FirstFragment();
    mapFragment =  ThirdMapFragment.getInstance();

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}

@Override
public void onClick(View v) {
    makeTransaction(v.getId());
}



private void makeTransaction(int id) {
    i++;
    transaction = fragmentManager.beginTransaction();
    if (i == 1) {
        transaction.replace(R.id.relativeLayout, firstFragment).commit();
    } else if (i == 2) {
        transaction.replace(R.id.relativeLayout, secondFragment).commit();
    } else {
    transaction.replace(R.id.relativeLayout, mapFragment).commit();
        i = 0;
    }
}
}

R.id.relativeLayout - main.xml中的布局

但我没有看到地图(带缩放按钮的空屏幕)以及如何制作LocationListener? THX。

3 个答案:

答案 0 :(得分:1)

如果您使用的是支持库,则必须使用SupportMapFragment类而不是地图片段的MapFragment。您的活动应该是FragmentActivity以支持库。以及Fragment经理。你必须getSupportFragmentManager()。

看看这段代码:

import com.google.android.gms.common.GooglePlayServicesUtil;
import android.os.Bundle;
import com.google.android.gms.maps.*;

public class Map extends android.support.v4.app.FragmentActivity
{
private GoogleMap map;


@Override
protected void onCreate(Bundle savedInstanceState) 
{
        super.onCreate(savedInstanceState);
        setContentView(R.layout.map);

        if (GooglePlayServicesUtil.isGooglePlayServicesAvailable(getApplicationContext()) == 0)
        {
            map = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
            map.setMapType(GoogleMap.MAP_TYPE_HYBRID);
        }
}}

如果在进行这些更改后仍然没有看到地图。检查您的API控制台是否已启用Google Map ANDROID API V2,而不仅仅是可能导致与您描述的结果相同的Google Map API V2。

答案 1 :(得分:1)

视图尚未创建,这就是为什么getMap()返回null,map不存在,将代码放入onResume

答案 2 :(得分:0)

放入清单,android的关键? 例如:

<application
        android:icon="@drawable/android"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <meta-data android:name="com.google.android.maps.v2.API_KEY"
            android:value="AIzaSyB2s6isdfsghDfgdfdfgDFGDG-yi4-aAYUma0Owc"/>

https://developers.google.com/maps/documentation/android/start