java - map 正在加载，但在 Android 开发中看不到 map

Question

我正在通过 Lynda 视频教程学习 Android 开发。

我正在使用 Google map API v2 来显示 map 。我已经按照教程完成了所有步骤。

当我尝试在我的设备中查看应用程序时，应用程序加载我可以看到 Google Logo ，但 map 不可见。 (我在底部看到带有 Google Logo 的白色背景)。

我已经添加了我的代码和屏幕截图。有人可以帮我解决这个问题吗？谢谢..

截图

我的java代码..

package lk.adspace.jaffnatemples;

import java.io.IOException;
import java.util.List;

import android.app.Dialog;
import android.location.Address;
import android.location.Geocoder;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
import android.widget.Toast;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.maps.CameraUpdate;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;

public class MainActivity extends FragmentActivity {

private static final int GPS_ERRORDIALOG_REQUEST = 9001;
GoogleMap mMap;

@SuppressWarnings("unused")
private static final double SEATTLE_LAT = 47.60621,
SEATTLE_LNG =-122.33207, 
SYDNEY_LAT = -33.867487,
SYDNEY_LNG = 151.20699, 
NEWYORK_LAT = 40.714353, 
NEWYORK_LNG = -74.005973;
private static final float DEFAULTZOOM = 15;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    if (servicesOK()) {
        setContentView(R.layout.activity_map);

        if (initMap()) {
            Toast.makeText(this, "Ready to map!", Toast.LENGTH_SHORT).show();
            gotoLocation(SEATTLE_LAT, SEATTLE_LNG, DEFAULTZOOM);
        }
        else {
            Toast.makeText(this, "Map not available!", Toast.LENGTH_SHORT).show();
        }
    }
    else {
        setContentView(R.layout.activity_main);
    }

}

@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;
}

public boolean servicesOK() {
    int isAvailable = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);

    if (isAvailable == ConnectionResult.SUCCESS) {
        return true;
    }
    else if (GooglePlayServicesUtil.isUserRecoverableError(isAvailable)) {
        Dialog dialog = GooglePlayServicesUtil.getErrorDialog(isAvailable, this, GPS_ERRORDIALOG_REQUEST);
        dialog.show();
    }
    else {
        Toast.makeText(this, "Can't connect to Google Play services", Toast.LENGTH_SHORT).show();
    }
    return false;
}

private boolean initMap() {
    if (mMap == null) {
        SupportMapFragment mapFrag =
                (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
        mMap = mapFrag.getMap();
    }
    return (mMap != null);
}

private void gotoLocation(double lat, double lng,
        float zoom) {
    LatLng ll = new LatLng(lat, lng);
    CameraUpdate update = CameraUpdateFactory.newLatLngZoom(ll, zoom);
    mMap.moveCamera(update);
}

public void geoLocate(View v) throws IOException {
    hideSoftKeyboard(v);

    EditText et = (EditText) findViewById(R.id.editText1);
    String location = et.getText().toString();

    Geocoder gc = new Geocoder(this);
    List<Address> list = gc.getFromLocationName(location, 1);
    Address add = list.get(0);
    String locality = add.getLocality();
    Toast.makeText(this, locality, Toast.LENGTH_LONG).show();

    double lat = add.getLatitude();
    double lng = add.getLongitude();

    gotoLocation(lat, lng, DEFAULTZOOM);

}

private void hideSoftKeyboard(View v) {
    InputMethodManager imm = (InputMethodManager)getSystemService(INPUT_METHOD_SERVICE);
    imm.hideSoftInputFromWindow(v.getWindowToken(), 0);
}

}

我的xml文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin" >

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="left|center_vertical"
        android:text="Location:"
        android:textSize="20sp" />

    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center|center_vertical"
        android:ems="10" >

        <requestFocus />
    </EditText>

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="right|center_vertical"
        android:text="Go" 
        android:onClick="geoLocate"/>
</LinearLayout>

<fragment
    android:id="@+id/map"
    android:name="com.google.android.gms.maps.SupportMapFragment"
    android:layout_width="292dp"
    android:layout_height="374dp" />

</LinearLayout>

我的 list 文件。

    <?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="lk.adspace.jaffnatemples"
        android:versionCode="1"
        android:versionName="1.0" >

        <uses-sdk
            android:minSdkVersion="8"
            android:targetSdkVersion="17" />

        <permission 
            android:name="lk.adspace.jaffnatemples.permission.MAPS_RECEIVE"
            android:protectionLevel="signature"/>

        <uses-permission android:name="lk.adspace.jaffnatemples.permission.MAPS_RECEIVE"/>
        <uses-permission android:name="android.permission.INTERNET"/>
        <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
        <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
        <uses-permission 
            android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>

        <uses-feature 
            android:glEsVersion="0x00020000"
            android:required="true"/>

        <application
            android:allowBackup="true"
            android:icon="@drawable/ic_launcher"
            android:label="@string/app_name"
            android:theme="@style/AppTheme" >
            <activity
                android:name="lk.adspace.jaffnatemples.MainActivity"
                android:label="@string/app_name" >
                <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.gms.version" 
     android:value="@integer/google_play_services_version" />


            <meta-data 
                android:name="com.google.android.maps.v2.API_KEY"
                android:value="I Added my Api Key"/>

        </application>

    </manifest>

有人可以帮我解决这个问题吗？谢谢。

Answer 1

更新 list 使用这个

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="lk.adspace.jaffnatemples"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />

    <permission
        android:name="lk.adspace.jaffnatemples.permission.MAPS_RECEIVE"
        android:protectionLevel="signature" />

    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
    <uses-permission android:name="com.ram.googlemapsv2.permission.MAPS_RECEIVE" />
    <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />

    <uses-feature
        android:glEsVersion="0x00020000"
        android:required="true" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="lk.adspace.jaffnatemples.MainActivity"
            android:label="@string/app_name" >
            <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.gms.version"
            android:value="v3" />
        <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="your api key" />
    </application>

</manifest>