我有一点问题......我制作了一个扩展webview的Android应用程序。 webview Html页面上有这样的地图:Map example,它也在这里我得到了灵感。我的onCreate方法如下所示:
super.onCreate(savedInstanceState);
//Removes the title bar in the application
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
//Creation of the Webview found in the XML Layout file
browserView = (WebView)findViewById(R.id.webkit);
//Removes both vertical and horizontal scroll bars
browserView.setVerticalScrollBarEnabled(false);
browserView.setHorizontalScrollBarEnabled(false);
myLocationManager=(LocationManager)getSystemService(Context.LOCATION_SERVICE);
//Enable Javascripts
url = "http://www.my-homepage.dk/map_example.html";
browserView.getSettings().setJavaScriptEnabled(true);
//The website which is wrapped to the webview
browserView.loadUrl(url);
因此,当我的应用程序获得GPS位置时,它会调用此方法:
LocationListener onLocationChange=new LocationListener() {
public void onLocationChanged(Location location) {
StringBuilder buf=new StringBuilder(url);
buf.append("?");
buf.append("lon=");
buf.append(String.valueOf(location.getLongitude()));
buf.append("&");
buf.append("lat=");
buf.append(String.valueOf(location.getLatitude()));
browserView.loadUrl(buf.toString());
}
所以它基本上只是加载另一个URL ....但是,我的问题是,1。它保留了orignal网站“地图图像”,我想它会“卸载”页面,并且2.当第二个网址是加载,它需要相当长的时间才能完成,当我在我的HTC Desire上测试时,它有时不会显示第二个加载的页面(带有位置的地图),然后关闭并锁定屏幕,或者如果我去在应用程序中,这有时也有帮助...
希望你能提供帮助:)
答案 0 :(得分:1)
建议 - 在onLocationChanged,make locationFound();
第一个语句而不是最后一个语句。
最好立即停止侦听器,因为loadUrl语句可能需要一些时间才能完成,而提供程序可能会发送更多更新。
答案 1 :(得分:0)
以下是解决方案...... GPS听众显然不止一次播出;)因此,当GPS找到位置时,它会加载网址,然后停止广播。
之前的问题是,它将大量的URL发送到html页面,因此从不加载1个单独的URL。我刚刚简化了onLocationChanged。
public void locationFound(){
myLocationManager.removeUpdates(this);
}
@Override
public void onLocationChanged(Location location) {
String lon = "lon="+String.valueOf(location.getLongitude());
String lat = "lat="+String.valueOf(location.getLatitude());
browserView.loadUrl(url+"?"+lon+"&"+lat);
locationFound();
}
以下是该应用程序的SourceCode:
package com.webview;
import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;
import android.view.Window;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class WebViewTest extends Activity implements LocationListener{
private WebView browserView;
private static String PROVIDER="gps";
private LocationManager myLocationManager=null;
private String url;
private boolean LocFound = false;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//Removes the title bar in the application
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
//Creation of the Webview found in the XML Layout file
browserView = (WebView)findViewById(R.id.webkit);
//Removes both vertical and horizontal scroll bars
browserView.setVerticalScrollBarEnabled(false);
browserView.setHorizontalScrollBarEnabled(false);
myLocationManager=(LocationManager)getSystemService(Context.LOCATION_SERVICE);
//Enable Javascripts
url = "http://www.test.dk/test.html";
browserView.getSettings().setJavaScriptEnabled(true);
//The website which is wrapped to the webview
browserView.loadUrl(url);
}
@Override
public void onResume() {
super.onResume();
myLocationManager.requestLocationUpdates(PROVIDER, 0,
0,
this);
}
@Override
public void onPause() {
super.onPause();
myLocationManager.removeUpdates(this);
}
public void locationFound(){
myLocationManager.removeUpdates(this);
}
@Override
public void onLocationChanged(Location location) {
String lon = "lon="+String.valueOf(location.getLongitude());
String lat = "lat="+String.valueOf(location.getLatitude());
browserView.loadUrl(url+"?"+lon+"&"+lat);
locationFound();
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
}