2010.12.10(3)——— android MapView 以及 Unable to instantiate activity ComponentInf

2010.12.10(3)——— android MapView 以及 Unable to instantiate activity ComponentInfo问题

清单文件：

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"      package="com.huitu"      android:versionCode="1"      android:versionName="1.0">    <application android:icon="@drawable/icon" android:label="@string/app_name">    <uses-library android:name="com.google.android.maps" />         <activity android:name=".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>    </application>    <uses-permission android:name="android.permission.INTERNET" />      <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>          <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>        <uses-sdk android:minSdkVersion="8" /></manifest>

注意
1、要加入包

<uses-library android:name="com.google.android.maps" />

2、要加入权限

<uses-permission android:name="android.permission.INTERNET" />      <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>          <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

layout文件：

<?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:layout_width="fill_parent"       android:layout_height="fill_parent"        android:id="@+id/mapview"        android:clickable="true"        android:enabled="true"        android:apiKey="0yhxK-DcK-8qhPG14wiKUL-zAkHqPDDVkk5W1hw"        />            <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>

android:apiKey="0yhxK-DcK-8qhPG14wiKUL-zAkHqPDDVkk5W1hw"

就是你申请的map api key

LinearLayout 是用来实现Zoom功能的

MainActivity

import java.util.List;import android.app.AlertDialog;import android.content.Context;import android.content.DialogInterface;import android.graphics.drawable.Drawable;import android.location.Location;import android.location.LocationListener;import android.location.LocationManager;import android.os.Bundle;import android.view.KeyEvent;import android.widget.LinearLayout;import android.widget.Toast;import android.widget.ZoomControls;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 com.google.android.maps.Overlay;import com.google.android.maps.OverlayItem;public class MainActivity extends MapActivity {private LinearLayout linearLayout;private MapView mapView;private ZoomControls mZoom;private LocationManager locationManager;private List<Overlay> mapOverlays;private Drawable drawable;private MyPositionItemizedOverlay itemizedOverlay;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);linearLayout = (LinearLayout) findViewById(R.id.zoomview);mapView = (MapView) findViewById(R.id.mapview);mZoom = (ZoomControls) mapView.getZoomControls();linearLayout.addView(mZoom);mapOverlays = mapView.getOverlays();drawable = this.getResources().getDrawable(R.drawable.red);itemizedOverlay = new MyPositionItemizedOverlay(drawable);locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);String provider = LocationManager.GPS_PROVIDER;//Location location = locationManager.getLastKnownLocation(provider);LocationListener ll = new LocationListener(){public void onLocationChanged(Location location) {double lat=0.0;double lng = 0.0;if (location != null) { lat = location.getLatitude(); lng = location.getLongitude();}else{lat = 39.92;lng = 116.46;}Toast.makeText(MainActivity.this, lat+"==="+lng, 0).show();GeoPoint point = new GeoPoint((int) (lat * 1E6), (int) (lng * 1E6));MapController controller = mapView.getController();controller.animateTo(point);controller.setZoom(21);OverlayItem overlayitem = new OverlayItem(point, "", "");itemizedOverlay.addOverlay(overlayitem);mapOverlays.add(itemizedOverlay);}public void onProviderDisabled(String provider) {}public void onProviderEnabled(String provider) {}public void onStatusChanged(String provider, int status,Bundle extras) {}         };locationManager.requestLocationUpdates(provider, 500, 5,ll);}@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {// 按下键盘上返回按钮if (keyCode == KeyEvent.KEYCODE_BACK) {new AlertDialog.Builder(this).setMessage("确定退出系统吗？").setNegativeButton("取消",new DialogInterface.OnClickListener() {public void onClick(DialogInterface dialog,int which) {}}).setPositiveButton("确定",new DialogInterface.OnClickListener() {public void onClick(DialogInterface dialog,int whichButton) {finish();}}).show();return true;} else {return super.onKeyDown(keyCode, event);}}@Overrideprotected void onDestroy() {super.onDestroy();// 或者下面这种方式//System.exit(0);//建议用这种android.os.Process.killProcess(android.os.Process.myPid());}protected boolean isRouteDisplayed() {return false;}}

注意：
1、一定要实现MapActivity 并且一定要重写

protected boolean isRouteDisplayed() {return false;}

这个方法

这个实现当坐标变化时会在地图上显示新的位置

Unable to instantiate activity ComponentInfo问题

这个问题就是我上面写的注意你只要都注意的应该就不会出这个问题了

但是其实说出来怕你们笑话我遇到这个问题折磨了我好几个小时最后的原因让人哭笑不得

<uses-library android:name="com.google.android.maps" />

我写成了

<

users-library android:name="com.google.android.maps" />

看清楚了 uses -------users

凌乱了。。。。。杯具了。。。

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