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Android开发如何利用Google map

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自google 06年进入中国,在地图、移动领域的发展速度基本上都是每年几倍的增长。在最新的Android平台开发相关应用程序,如果能深入了解google map 将会对我们Android开发提供很大的帮助.以下是我总结的在Android开发中对google map的理解。

1. 首先先要获取你的debug keystore位置:

打开Eclipse--->Windows---> preferences--->Android--->Build
查看默认的debug keystore位置,我的是C:\Documents and Settings\sdhbk\.android\debug.keystore

2.
D:\android-sdk-windows-1.5_r1\tools>keytool -list -alias androiddebugkey -keysto
re "C:\Documents and Settings\sdhbk\.android\debug.keystore" -storepass android
-keypass android
androiddebugkey, 2009-7-25, PrivateKeyEntry,
认证指纹 (MD5): DA:D5:6E:C2:80:D1:0F:0D:F8:2A:58:6A:74:7C:CE:2D

3.
   打开http://code.google.com/intl/zh-CN/android/maps-api-signup.html

填入你的认证指纹(MD5)即可获得apiKey了,结果显示如下:
         感谢您注册 Android 地图 API 密钥!

            您的密钥是:

       XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

4.       使用得到的apiKey:

              在layout中加入MapView
              <com.google.android.maps.MapView
                      android:id="@+id/mapview"
                      android:layout_width="fill_parent"
                      android:layout_height="fill_parent"
                      android:apiKey="0jOkQ80oD1JL9C6HAja99uGXCRiS2CGjKO_bc_g" />

  或者

  <view android:id="@+id/mv"
   class="com.google.android.maps.MapView"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   android:layout_weight="1"
   android:apiKey="0jOkQ80oD1JL9C6HAja99uGXCRiS2CGjKO_bc_g"
   />

5.Android在sdk1.5的预装的add-on中提供了一个Map扩展库com.google.android.maps,利用它你就可以给你的android应用程序增加上强大的地图功能了。这个库的位置在Your-SDK_DIR\add-ons\google_apis-3\libs.
一定要在manifest.xml中设置全相应的权限,比如:

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />
要在manifest.xml中加上要用的maps库:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.package.name">
  ...
  <application android:name="MyApplication" >
    <uses-library android:name="com.google.android.maps" />
    ...
  </application>
  ...
</manifest>

需要说明的是这个库不是标准的android sdk的内容,你也可以自己从这里这里下载并放到你的sdk里面。

Maps库分析


Maps库提供了十几个类,具体可以参考这里http://code.google.com/intl/ja/android/add-ons/google-apis/reference/index.html,  包括Mapview,MapController,MapActivity等。

Mapview是用来显示地图的view, 它也是派生自android.view.ViewGroup。

地图可以以不同的形式来显示出来,如街景模式,卫星模式等,具体方法可以参考:

setSatellite(boolean), setTraffic(boolean), and setStreetView(boolean)

MapView只能被MapActivity来创建,这是因为mapview需要通过后台的线程来连接网络或者文件系统,而这些线程要由mapActivity来管理。


需要特别说明的一点是,android 1.5中,map的zoom采用了built-in机制,可以通过setBuiltInZoomControls(boolean)来设置是否在地图上显示zoom控件。


MapActivity是一个抽象类,任何想要显示MapView的activity都需要派生自MapActivity。并且在其派生类的onCreate()中,都要创建一个MapView实例,可以通过MapView constructor (then add it to a layout View with ViewGroup.addView(View)) 或者通过layout XML来创建。

实例分析


最后,按照惯例,还是用一个小程序来演示一下android中地图功能的开发。主要功能是实现了地图的缩放,添加了菜单,从而可以手动选择地图的显示模式等。

Step 1: 新建一个android project, 注意这里要选择的build target为"Google APIs"


Step 2: 修改menifest文件:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.map.prac"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.INTERNET" />
    <application android:icon="@drawable/icon" android:label="@string/app_name">
    <uses-library android:name="com.google.android.maps" />
        <activity android:name=".MapViewPrac2"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
    <uses-sdk android:minSdkVersion="3" />
</manifest>


Step 3: 修改layout文件,main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/main"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <com.google.android.maps.MapView
        android:id="@+id/map"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:enabled="true"
        android:clickable="true"
        android:apiKey="???????????????????????????????????"
        />
</LinearLayout>
这里需要将api key中的????????????改成你自己申请到的api key.


Step 4: 修改代码:

package com.map.prac;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
public class MapViewPrac2 extends MapActivity {
    private final String TAG = "MapPrac";
    private MapView mapView = null;
    private MapController mc;
    //Menu items
    final private int menuMode = Menu.FIRST;
    final private int menuExit = Menu.FIRST+1;
    final private int menuCommandList = Menu.FIRST + 2;
    private int chooseItem = 0;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mapView = (MapView)findViewById(R.id.map);
        mc = mapView.getController();
        mapView.setTraffic(true); //
        mapView.setSatellite(false);
        mapView.setStreetView(true);
        //GeoPoint gp = new GeoPoint((int)(39.269259 * 1000000), (int)(115.255762 * 1000000));//yixian
        GeoPoint gp = new GeoPoint((int)(39.95 * 1000000), (int)(116.37 * 1000000));//beijing
        //mc.animateTo(gp);
        //mc.setZoom(12);
        mc.setCenter(gp);
        //to display zoom control in MapView
        mapView.setBuiltInZoomControls(true);
    }
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        // TODO Auto-generated method stub
        Log.i(TAG,"enter onKeyDown");
        return super.onKeyDown(keyCode, event);
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        menu.add(0, menuMode, 0, "Map Mode");
        menu.add(0, menuCommandList, 1, "Command List");
        menu.add(0, menuExit, 2, "Exit");
        return super.onCreateOptionsMenu(menu);
    }
    @Override
    public boolean onMenuItemSelected(int featureId, MenuItem item) {
        // TODO Auto-generated method stub
        switch(item.getItemId())
        {
        case menuMode:
            Dialog dMode = new AlertDialog.Builder(this)
            //.setIcon(R.drawable.alert_dialog_icon)
            .setTitle(R.string.alert_dialog_single_choice)
            .setSingleChoiceItems(R.array.select_dialog_items2, chooseItem, new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int whichButton) {
                    Log.i(TAG, "choose button is "+ whichButton);
                    chooseItem = whichButton;
                    /* User clicked on a radio button do some stuff */
                }
            })
            .setPositiveButton(R.string.alert_dialog_ok, new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int whichButton) {
                    /* User clicked Yes so do some stuff */
                    Log.i(TAG,"item = "+chooseItem);
                    switch(chooseItem)
                    {
                    case 0:
                        mapView.setSatellite(false);
                        break;
                    case 1:
                        mapView.setSatellite(true);
                        break;
                    case 2:
                        mapView.setTraffic(true);
                        break;
                    case 3:
                        mapView.setStreetView(true);
                        break;
                    default:
                        break;
                    }
                }
            })
            .setNegativeButton(R.string.alert_dialog_cancel, new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int whichButton) {
                    /* User clicked No so do some stuff */
                }
            })
           .create();
            dMode.show();
            break;
        case menuCommandList:
            //create the dialog
            Dialog d = new AlertDialog.Builder(this)
            .setTitle(R.string.select_dialog)
            .setItems(R.array.select_dialog_items, new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    /* User clicked so do some stuff */
                    String[] items = getResources().getStringArray(R.array.select_dialog_items);
                    /*new AlertDialog.Builder(this)
                            .setMessage("You selected: " + which + " , " + items[which])
                            .show();*/
                    Log.i(TAG,"you choose is: " + items[which]);
                }
            })
            .create();
            //show the dialog
            d.show();
            break;
        case menuExit:
            finish();
            break;
        default:
                break;
        }
        return super.onMenuItemSelected(featureId, item);
    }
    @Override
    protected boolean isRouteDisplayed() {
        // TODO Auto-generated method stub
        return false;
    }
}
关于google map的用法还有待各位Android开发人员在实际开发中的总结!

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评论
1 楼 elena_java 2011-04-13  
规整一下第二部:
打开Eclipse--->Windows--->Preferences--->Android--->Build
查看默认的debug keystore位置(C:\Users\(主机名)\.android\debug.keystore).在命令提示符窗口(在运行中输入cmd)中定位到debug.keystore所在的文件夹:cd  C:\Users\(主机名)\.android\             上面主机名是你本机上的主机名
执行:keytool -list -keystore debug.keystore   提示输入密码,默认密码是:android

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