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嗨，大家好我正在开发一个应用程序与地图，我做了四个TextView和一个ImageView自定义infowindow。现在我知道一个InfoWindow是一个预渲染的图像，所以我的问题是我想为每个标记出现一个个性化的图像：它的工作原理很简单，但是在第一次点击时，第二次点击时只有一个空白区域，图像显示成功。我该如何解决ImageView问题？
第一次轻触：
然后当我点击标记上的第二次： 
我显然想避免敲击两次，使PIC show..it是一个大问题。我使用Picasso库从网络加载图像，并保留来自四个xml文件的图像URL。所以我明白问题是，当系统缓存图像时，系统可以加载图像。所以我想到了这个解决方法：当应用程序开始调用Asynctask以在不可见的ImageView上加载图像时，但是这只适用于它从xml保留的最后一个URL，而不是其他标记。 所以我想问你，如果你有一些想法做到这一点。
下面我的代码：
在开始的时候我打电话的AsyncTask：
View v = this.getWindow().getDecorView().findViewById(R.id.immaginenascosta);
CacheTask cacheTask = new CacheTask(v);
cacheTask.execute();
CacheTask，从互联网延伸的AsyncTask下载xml文件并保存在SD卡（后台）类的话，就从读取XML（SD卡上）和上飘ImageView的加载图像：
CacheTask
public class CacheTask extends AsyncTask<Void, Void, Void>{
String [] imgurlarray = {};
int dim = 0;
String root = "http://www.emmebistudio.com/markers_Predappio_living/";
String [] arraymarkers = {"markers_history.xml","markers_hotel.xml","markers_restaurant.xml","markers_souvenir.xml"};
String pathdirectory = "/sdcard/PredappioLiving";
private View view;
public CacheTask(View view){
this.view = view;
}
public void MakeCache (View v)
{
}
@Override
protected Void doInBackground(Void... params) {
for (int i = 0; i < arraymarkers.length; i++)
{
String urlcompleta = root+arraymarkers[i];
//Estraggo la stringa del nome dall'url--------------------------------------------------------------
String stringurl = urlcompleta.toString(); // Prende: http://www.emmebistudio.com/Predappio_living/markers.xml e lo mette in array
String [] urlarray = stringurl.split("/"); // ^^ ^ ^ ^
// | | | | |
// | | | | |
String nomefile = urlarray[4]; // 0 1 2 3 4
//Adattare a seconda della posizione definitiva dei file XML
//----------------------------------------------------------------------------------------------------
try {
URL url = new URL(urlcompleta);
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.setDoOutput(true);
urlConnection.connect();
File dir = new File(pathdirectory);
dir.mkdirs();
File fileWithinMyDir = new File(dir, nomefile);
FileOutputStream fileOutput = new FileOutputStream(fileWithinMyDir);
InputStream inputStream = urlConnection.getInputStream();
int totalSize = urlConnection.getContentLength(); //mi salvo la lunghezza del file da salvare
int downloadedSize = 0;
byte[] buffer = new byte[1024];
int bufferLength = 0; //per salvare usiamo una dimensione temporanea del buffer
// salvo attraverso il buffer di input e scrivo il contenuto nel file.
while((bufferLength = inputStream.read(buffer)) > 0){
fileOutput.write(buffer,0,bufferLength);
downloadedSize += bufferLength;
int progress = (int)(downloadedSize*100/totalSize);
}
fileOutput.close();
}
catch(Exception e){
e.printStackTrace();
}
}
return null;
}
@Override
protected void onPostExecute(Void result) {
for (int i = 0; i < arraymarkers.length; i++)
{
String urlcompleta = root+arraymarkers[i];
//Estraggo la stringa del nome dall'url--------------------------------------------------------------
String stringurl = urlcompleta.toString(); // Prende: http://www.emmebistudio.com/Predappio_living/markers.xml e lo mette in array
String [] urlarray = stringurl.split("/"); // ^^ ^ ^ ^
// | | | | |
// | | | | |
String nomefile = urlarray[4]; // 0 1 2 3 4
//Adattare a seconda della posizione definitiva dei file XML
//----------------------------------------------------------------------------------------------------
try{
/* * * * * Inizio Parsing * * * * */
/***************************************/
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.parse(new FileInputStream(pathdirectory+"/"+nomefile));
doc.getDocumentElement().normalize();
NodeList markers = doc.getElementsByTagName("marker");
ImageView []image = new ImageView[100];
image[i]=(ImageView) view.findViewById(R.id.immaginenascosta);
//ImageView image = (ImageView) view.findViewById(R.id.immaginenascosta);
for (int j=0; j<markers.getLength(); j++){
Element item = (Element) markers.item(i);
String urlimmagine = item.getAttribute("immagine");
Picasso.with(view.getContext())
.load(urlimmagine)
.error(R.drawable.ic_launcher) //in caso di errore fa vedere questa immagine (un triangolo penserei)
.resize(150, 110)
.into(image[i]);
}
/***************************************/
/* * * * * Fine Parsing * * * * */
}catch(Exception e){
e.printStackTrace();
}
super.onPostExecute(result);
}
}
}
这就是 “飘” 的ImageView的布局：
<ImageView
android:id="@+id/immaginenascosta"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:visibility="gone"/>
这是setInfoWindowAdapter：
map.setInfoWindowAdapter(new InfoWindowAdapter() {
View v = getLayoutInflater().inflate(R.layout.custom_info_window, null);
@Override
public View getInfoWindow(Marker marker) {
return null;
}
@Override
public View getInfoContents(Marker marker) {
//Prova immagine custom
/***********************************/
//final ProgressDialog dialog = ProgressDialog.show(MainActivity.this, "Attendere...", "Caricamento delle immagini in corso..", true);
BuildInfoMatrix req = new BuildInfoMatrix();
String nome = marker.getTitle();
String currentUrl = "";
//String currentUrl=req.findImageUrl(nome);
int vuoto = -15;
try{
currentUrl=req.findImageUrl(nome);
}catch(Exception e){
currentUrl = "http://upload.wikimedia.org/wikipedia/commons/b/bb/XScreenSaver_simulating_Windows_9x_BSOD.png";
}
if (currentUrl == null)
{
currentUrl = "http://upload.wikimedia.org/wikipedia/commons/b/bb/XScreenSaver_simulating_Windows_9x_BSOD.png";
}
ImageView image;
image = (ImageView) v.findViewById(R.id.image_nuvoletta);
Picasso.with(v.getContext())
.load(currentUrl)
.error(R.drawable.ic_launcher) //in caso di errore fa vedere questa immagine (un triangolo penserei)
.resize(150, 110)
.into(image, new Callback(){
@Override
public void onSuccess(){
}
@Override
public void onError(){
}
});
/***********************************/
/* Distanza a piedi e macchina sulla nuvoletta */
/***********************************************/
GPSTracker gpsTracker = new GPSTracker(MainActivity.this);
if (gpsTracker.canGetLocation())
{
String stringLatitude = String.valueOf(gpsTracker.latitude);
String stringLongitude = String.valueOf(gpsTracker.longitude);
double currentLat = Double.parseDouble(stringLatitude);
double currentLng = Double.parseDouble(stringLongitude);
double destLat = marker.getPosition().latitude;
double destLng = marker.getPosition().longitude;
final float[] results = new float[3];
Location.distanceBetween(currentLat, currentLng, destLat, destLng, results);
float metri = results[0];
float km = Math.round((double)metri/1000);
int minuti_persona = (int)Math.round(metri/125); //125 metri al minuto -> velocità media di 2,5 m/s
int minuti_auto = (int)Math.round(km/0.7); //700 metri al minuto -> velocità media di 42 km/h
/***********************************************/
TextView tvTitle = (TextView) v.findViewById(R.id.title);
TextView tvSnippet = (TextView) v.findViewById(R.id.snippet);
tvSnippet.setTypeface(tvSnippet.getTypeface(), Typeface.ITALIC); //indirizzo in corsivo
TextView tvPedonal_distance = (TextView) v.findViewById(R.id.pedonal_time);
TextView tvCar_distance = (TextView) v.findViewById(R.id.car_time);
tvTitle.setText(marker.getTitle());
tvSnippet.setText(marker.getSnippet());
if(minuti_persona <=0) // Stampa tempo per coprire la distanza
{
tvCar_distance.setText("A piedi: meno di un minuto");
}else
{
tvPedonal_distance.setText("A piedi: "+minuti_persona+ " minuti");
}
if(minuti_auto <= 0)
{
tvCar_distance.setText("In auto: meno di un minuto");
}else
{
tvCar_distance.setText("In auto: " +minuti_auto+ " minuti");
}
return v;
}else
{
TextView tvTitle = (TextView) v.findViewById(R.id.title);
TextView tvSnippet = (TextView) v.findViewById(R.id.snippet);
tvTitle.setText(marker.getTitle());
tvSnippet.setText(marker.getSnippet());
return v;
}
}
});
谢谢大家。
为什么它的知名度没有了吗？当你点击第二次气球时发生了什么？ – Blackbelt 2014-10-17 09:43:58
我做了一个不可见的图像预览图像InfoWindow的ImageViews。当我点击气球出现一个对话框 – 2014-10-17 09:53:18