Question

我有一个带有app抽屉的简单Android应用程序，它可以在我的活动中选择片段。当我选择地图片段时，没有显示地图，因为它从未准备好。这是代码：

package com.example.tanktoo.eventreporter;

import android.app.Fragment;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;

import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.OnMapReadyCallback;

public class MainActivity extends AppCompatActivity
    implements NavigationView.OnNavigationItemSelectedListener, OnMapReadyCallback {

EventMapFragment mapFragment;
boolean mapReady = false;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
        this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
    drawer.setDrawerListener(toggle);
    toggle.syncState();

    NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
    navigationView.setNavigationItemSelectedListener(this);

    this.mapFragment = new EventMapFragment();
    this.mapFragment.getMapAsync(this);
    System.out.println("map" + this.mapFragment);
}


    public void onMapReady(GoogleMap googleMap) {
        System.out.println("###############");
        this.mapReady = true;
    }

@Override
public void onBackPressed() {
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    if (drawer.isDrawerOpen(GravityCompat.START)) {
        drawer.closeDrawer(GravityCompat.START);
    } else {
        super.onBackPressed();
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.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);
}

@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
    // Handle navigation view item clicks here.
    int id = item.getItemId();
    Fragment fragment = null;

    if (id == R.id.nav_map) {
        System.out.println("reeady " + this.mapReady);
        if(this.mapReady){
            fragment = this.mapFragment;
        }
    } else if (id == R.id.nav_report_event) {
        fragment = new ReportEventFragment();
    } else if (id == R.id.nav_config) {
        fragment = new ConfigFragment();
    } else if (id == R.id.nav_user) {
        fragment = new UserFragment();
    }
    if(fragment != null) {
        System.out.println("select: " + fragment);
        FragmentTransaction ft = getFragmentManager().beginTransaction();
        ft.replace(R.id.mainFrame, fragment);
        ft.commit();
    }


    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    drawer.closeDrawer(GravityCompat.START);
    return true;
}
}

这是地图片段的java类（EventMapFragment.java）：

package com.example.tanktoo.eventreporter;
import android.os.Bundle;

import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;



public class EventMapFragment extends MapFragment {


public EventMapFragment() {
    // Required empty public constructor
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragment_eventmap, container, false);
}

}

这是布局文件fragment_eventmap.xml：

< FrameLayout 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"
tools:context="com.example.tanktoo.eventreporter.EventMapFragment">

<!-- TODO: Update blank fragment layout -->
<fragment
    android:id="@+id/eventmap"
    android:name="com.google.android.gms.maps.MapFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
/>

的Manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.tanktoo.eventreporter">

    <permission android:name="com.example.tanktoo.eventreporter.permission.MAPS_RECEIVE"
        android:protectionLevel="signature" />

    <uses-permission android:name="com.example.tanktoo.eventreporter.MAPS_RECEIVE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
            android:theme="@style/AppTheme.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <meta-data
            android:name="com.google.android.geo.API_KEY"
            android:value="KEY...kY"
            />
    </application>

</manifest>

所以我的问题是从不调用Callback方法，并且mapReady始终保持为false。有谁能够帮我？不知道在布局文件中添加地图片段是否正确。地图服务本身在应用程序中运行。我已经在主屏幕的MainActivity布局中设置了一个地图片段（不是我的扩展类）来测试它。这很好。

感谢您的帮助！

Android MapFragment没有调用OnMapReadyCallback

0 个答案: