Eclipse 开发 Android, Hello, MapView （学习5）

最新推荐文章于 2025-10-20 15:32:47 发布

最新推荐文章于 2025-10-20 15:32:47 发布 · 134 阅读

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#Android #Eclipse #Google #OS #XML

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本文介绍了一个简单的Android地图应用HelloMapView的实现过程，包括HelloItemizedOverlay类和HelloMapView1类的具体代码实现，并提供了布局文件main.xml的内容。文章还提到了在实际运行中遇到的无法显示Google地图的问题。

Hello, MapView

学习地址： http://androidappdocs.appspot.com/guide/tutorials/views/hello-mapview.html

HelloItemizedOverlay.java代码

package com.example.test;

import java.util.ArrayList;

import android.graphics.drawable.Drawable;

import com.google.android.maps.ItemizedOverlay;
import com.google.android.maps.OverlayItem;

public class HelloItemizedOverlay extends ItemizedOverlay {
	
	private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();

	public HelloItemizedOverlay(Drawable defaultMarker) {
		super(boundCenterBottom(defaultMarker));
		// TODO Auto-generated constructor stub
	}

	@Override
	public int size() {
		return mOverlays.size();
	}
	
	public void addOverlay(OverlayItem overlay) {
	    mOverlays.add(overlay);
	    populate();
	}
	
	@Override
	protected OverlayItem createItem(int i) {
	  return mOverlays.get(i);
	}
	
	
}

HelloMapView1.java代码

package com.example.test;

import java.util.List;

import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.widget.LinearLayout;
import android.widget.ZoomControls;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;
import com.google.android.maps.OverlayItem;

public class HelloMapView1 extends MapActivity {
	
	LinearLayout linearLayout;
	MapView mapView;
	ZoomControls mZoom;	
	
	List<Overlay> mapOverlays;
	Drawable drawable;
	HelloItemizedOverlay itemizedOverlay;
	
    /** 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.mapview); 
        mapView.setBuiltInZoomControls(true);           

        mapOverlays = mapView.getOverlays();
        drawable = this.getResources().getDrawable(R.drawable.androidmarker);
        itemizedOverlay = new HelloItemizedOverlay(drawable);
                
        GeoPoint point = new GeoPoint(19240000,-99120000);
        OverlayItem overlayitem = new OverlayItem(point, "", "");
        
        itemizedOverlay.addOverlay(overlayitem);
        mapOverlays.add(itemizedOverlay);        
    }
    
    @Override
    protected boolean isRouteDisplayed() {
        return false;
    }
    
}

Layout->mail.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/mainlayout"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <com.google.android.maps.MapView
        android:id="@+id/mapview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:clickable="true"
        android:apiKey="Your Maps API Key"
    />

	<LinearLayout
	    android:id="@+id/zoomview"
	    android:layout_width="wrap_content"
	    android:layout_height="wrap_content"
	    android:layout_alignBottom="@id/mapview"
	    android:layout_centerHorizontal="true"
	/>

</RelativeLayout>

执行 android Application ，发现无法显示google的地图，请知道原因的朋友告诉一下我，谢谢。