安卓 : Access Mapview Inside Fragment With ViewPager

Question

我正在使用 View Pager 显示三个 View 。

"Filter","Streets","Around"

每个 View 都由 fragment 定义。

我想要什么:我想在我的 FilterFragment 中使用 Mapview。

我做了什么:

我想在过滤器 fragment 中使用 MapView 但无法成功运行。并获取日志类别错误:

android.view.InflateException:二进制 XML 文件第 33 行:错误膨胀类 com.google.android.maps.MapView

我还在 Net 和 Stackoverflow 上搜索了这个问题并找到了 LINK和 LINK但无法找到与我的问题相关的链接，因为我正在使用带有 ViewPager 的 fragment 。

我已将我的代码放在下面。

这是我的 MainViewPager.java 代码:

    package com.example.viewpageractivitydemo;

    import com.example.viewpageractivitydemo.viewpager.TitlePageIndicator;

    import android.os.Bundle;
    import android.support.v4.app.FragmentActivity;
    import android.support.v4.view.ViewPager;
    import android.util.Log;

    public class MainViewPager extends FragmentActivity {

        TestFragmentAdapter adapter;
        ViewPager pager;

        @Override
        protected void onCreate(Bundle arg0) {
            // TODO Auto-generated method stub
            super.onCreate(arg0);
            Log.i("MainViewPager","Inside Oncreate");
            setContentView(R.layout.mainviewpager);
            pager = (ViewPager) findViewById(R.id.pager);

            adapter = new TestTitleFragmentAdapter(getSupportFragmentManager());
            pager.setAdapter(adapter);

            TitlePageIndicator indicator = (TitlePageIndicator) findViewById(R.id.indicator);
            indicator.setViewPager(pager);
            pager.setCurrentItem(1);

        }

        @Override
        protected void onResume() {
            // TODO Auto-generated method stub
            super.onResume();

    //      pager.setCurrentItem(1);
        }

    }

这是 TestFragmentAdapter.java 的代码

package com.example.viewpageractivitydemo;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.util.Log;

public class TestFragmentAdapter extends FragmentPagerAdapter {

    protected static final String[] CONTENT = new String[] { "Filter",
            "Streets", "Around" };
    public String TAG = "TestFragmentAdapter";
    private int mCount = CONTENT.length;

    public TestFragmentAdapter(FragmentManager fm) {
        super(fm);
        // TODO Auto-generated constructor stub
    }

    @Override
    public Fragment getItem(int position) {
        // TODO Auto-generated method stub
        Log.i(TAG, "Inside getItemMethod with position " + position);

        if (position == 0) {
            Log.i("TestFragmentAdapter","Inside if Condition");
            return FilterFragment.newInstance(position);
        } else if (position == 1) {
            return StreetsFragment.newInstance(position);
        } else if (position == 2) {
            return AroundFragment.newInstance(position);
        } else {
            return null;
        }
        // return MainFragment.newInstance(CONTENT[position % CONTENT.length]);

    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return mCount;
    }

    public void setCount(int count) {
        if (count > 0 && count <= 10) {
            mCount = count;
            notifyDataSetChanged();
        }
    }

}

这是我的 FilterFragment.java 代码:

package com.example.viewpageractivitydemo;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class FilterFragment extends Fragment {

    /*
     * @Override protected Class<? extends Activity> getActivityClass() { //
     * TODO Auto-generated method stub return MyFilterActivity.class; }
     */

    public static Fragment newInstance(int position) {

        Log.i("FilterFragment","Inside New Instasnce");
        FilterFragment filterFragment = new FilterFragment();
        return filterFragment;

    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        Log.i("FilterFragment","Inside OcCreateView");
        View view = inflater.inflate(R.layout.filter, null);
        return view;
    }

}

这是我的 filter.xml 代码:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#C6CDD4"
    android:gravity="center"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical" >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="#93A4BA"
            android:gravity="center" >

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentLeft="true"
                android:layout_margin="5dp"
                android:gravity="center"
                android:text="Where Am I"
                android:textColor="#ffffff"
                android:textSize="18dp"
                android:textStyle="bold" >
            </TextView>
        </LinearLayout>

        <com.google.android.maps.MapView
            android:id="@+id/whereami_mapview"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:apiKey="0-PaH6rk7RKrZSMd_lqdrZi6FazYyIlX5r6YFyA"
            android:clickable="true" />

        <!--
             <com.google.android.maps.MapView
            android:id="@+id/whereami_mapview"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:apiKey="0-PaH6rk7RKrZSMd_lqdrZi6FazYyIlX5r6YFyA" />



        -->
    </LinearLayout>

</LinearLayout>

任何人都可以建议我解决我的问题的答案。我在这上面花了很多时间。仍然对我的问题一无所知。提前致谢。

Answer 1

您可以使用 LocalActivityManager 在 fragment 中托管 Activity。这是一个已弃用的类，但它提供了最简单的解决方案。

这是 fragment 的代码(代码中的 MyFilterFragment)。 YourMapActivity 是扩展 MapActivity 的基本 Activity 。

public class MapFragment extends Fragment {
    private static final String KEY_STATE_BUNDLE = "localActivityManagerState";

    private LocalActivityManager mLocalActivityManager;

    protected LocalActivityManager getLocalActivityManager() {
        return mLocalActivityManager;
    }

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

        Bundle state = null;
        if (savedInstanceState != null) {
            state = savedInstanceState.getBundle(KEY_STATE_BUNDLE);
        }

        mLocalActivityManager = new LocalActivityManager(getActivity(), true);
        mLocalActivityManager.dispatchCreate(state);
    }

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
            //This is where you specify you activity class
        Intent i = new Intent(getActivity(), YourMapActivity.class); 
        Window w = mLocalActivityManager.startActivity("tag", i); 
        View currentView=w.getDecorView(); 
        currentView.setVisibility(View.VISIBLE); 
        currentView.setFocusableInTouchMode(true); 
        ((ViewGroup) currentView).setDescendantFocusability(ViewGroup.FOCUS_AFTER_DESCENDANTS);
        return currentView;
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putBundle(KEY_STATE_BUNDLE,
                mLocalActivityManager.saveInstanceState());
    }

    @Override
    public void onResume() {
        super.onResume();
        mLocalActivityManager.dispatchResume();
    }

    @Override
    public void onPause() {
        super.onPause();
        mLocalActivityManager.dispatchPause(getActivity().isFinishing());
    }

    @Override
    public void onStop() {
        super.onStop();
        mLocalActivityManager.dispatchStop();
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        mLocalActivityManager.dispatchDestroy(getActivity().isFinishing());
    }
}

---

编辑:自此答案发布后，Google 发布了带有官方 MapFragment 类 fragment 支持的 Google Maps Android API。