我正在地图中使用群集，并使用图像创建了自定义标记，并使用glide从url下载图像并将其渲染到标记中。但是，我的问题是第一次将地图加载的图像未渲染到标记时。放大一些后，只有滑行才开始下载图像。但是我想在地图加载的第一次调用时下载图像。如果我使用URL流下载，效果很好。但这将在每次图像下载。有人请帮我解决这个问题。在我附加我的代码后，就在这里。
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.StrictMode;
import android.support.v4.app.FragmentActivity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.Toast;
import com.bumptech.glide.Glide;
import com.bumptech.glide.load.engine.DiskCacheStrategy;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.LatLngBounds;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.maps.android.clustering.Cluster;
import com.google.maps.android.clustering.ClusterItem;
import com.google.maps.android.clustering.ClusterManager;
import com.google.maps.android.clustering.view.DefaultClusterRenderer;
import com.google.maps.android.ui.IconGenerator;
import com.google.maps.android.utils.demo.model.Person;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
/**
* Demonstrates heavy customisation of the look of rendered clusters.
*/
public class CustomMarkerClusteringDemoActivity2 extends FragmentActivity implements OnMapReadyCallback,ClusterManager.OnClusterClickListener<Person>, ClusterManager.OnClusterInfoWindowClickListener<Person>, ClusterManager.OnClusterItemClickListener<Person>, ClusterManager.OnClusterItemInfoWindowClickListener<Person> {
private ClusterManager<Person> mClusterManager;
private Random mRandom = new Random(1984);
private GoogleMap mMap;
protected int getLayoutId() {
return R.layout.map;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(getLayoutId());
setUpMap();
}
@Override
protected void onResume() {
super.onResume();
setUpMap();
}
@Override
public void onMapReady(GoogleMap map) {
if (mMap != null) {
return;
}
mMap = map;
startDemo();
}
private void setUpMap() {
((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMapAsync(this);
}
protected GoogleMap getMap() {
return mMap;
}
/**
* Draws profile photos inside markers (using IconGenerator).
* When there are multiple people in the cluster, draw multiple photos (using MultiDrawable).
*/
private class PersonRenderer extends DefaultClusterRenderer<Person> {
private final IconGenerator mIconGenerator = new IconGenerator(getApplicationContext());
private final IconGenerator mClusterIconGenerator = new IconGenerator(getApplicationContext());
private final ImageView mImageView;
private final ImageView mClusterImageView;
private final int mDimension;
public PersonRenderer() {
super(getApplicationContext(), getMap(), mClusterManager);
View multiProfile = getLayoutInflater().inflate(R.layout.multi_profile, null);
mClusterIconGenerator.setContentView(multiProfile);
mClusterImageView = (ImageView) multiProfile.findViewById(R.id.image);
mImageView = new ImageView(getApplicationContext());
mDimension = (int) getResources().getDimension(R.dimen.custom_profile_image);
mImageView.setLayoutParams(new ViewGroup.LayoutParams(mDimension, mDimension));
int padding = (int) getResources().getDimension(R.dimen.custom_profile_padding);
mImageView.setPadding(padding, padding, padding, padding);
mIconGenerator.setContentView(mImageView);
}
@Override
protected void onBeforeClusterItemRendered(Person person, MarkerOptions markerOptions) {
Glide.with(CustomMarkerClusteringDemoActivity2.this)
.load(person.profilePhoto).asBitmap()
.diskCacheStrategy(DiskCacheStrategy.ALL)
.fitCenter()
.placeholder(R.drawable.ic_launcher).dontAnimate().into(mImageView);
// URL url = null;
// try {
// url = new URL(person.profilePhoto);
// Bitmap bmp = BitmapFactory.decodeStream(url.openConnection().getInputStream());
// mImageView.setImageBitmap(bmp);
// } catch (MalformedURLException e) {
// e.printStackTrace();
// } catch (IOException e) {
// e.printStackTrace();
// }
Bitmap icon = mIconGenerator.makeIcon();
markerOptions.icon(BitmapDescriptorFactory.fromBitmap(icon)).title(person.name);
}
@Override
protected void onBeforeClusterRendered(Cluster<Person> cluster, MarkerOptions markerOptions) {
// Draw multiple people.
// Note: this method runs on the UI thread. Don't spend too much time in here (like in this example).
List<Drawable> profilePhotos = new ArrayList<Drawable>(Math.min(4, cluster.getSize()));
int width = mDimension;
int height = mDimension;
Bitmap dummyBitmap=null;
Drawable drawable=null;
for (Person p : cluster.getItems()) {
// Draw 4 at most.
if (profilePhotos.size() == 4) break;
try {
dummyBitmap = Glide.with(getApplicationContext()).load(p.profilePhoto)
.asBitmap().into(70,70).get();
} catch (Exception e) {
e.printStackTrace();
}
drawable = new BitmapDrawable(getResources(), dummyBitmap);
drawable.setBounds(0, 0, width, height);
profilePhotos.add(drawable);
}
MultiDrawable multiDrawable = new MultiDrawable(profilePhotos);
multiDrawable.setBounds(0, 0, width, height);
mClusterImageView.setImageDrawable(multiDrawable);
Bitmap icon = mClusterIconGenerator.makeIcon(String.valueOf(cluster.getSize()));
markerOptions.icon(BitmapDescriptorFactory.fromBitmap(icon));
}
@Override
protected boolean shouldRenderAsCluster(Cluster cluster) {
// Always render clusters.
return cluster.getSize() > 1;
}
}
@Override
public boolean onClusterClick(Cluster<Person> cluster) {
// Show a toast with some info when the cluster is clicked.
String firstName = cluster.getItems().iterator().next().name;
Toast.makeText(this, cluster.getSize() + " (including " + firstName + ")", Toast.LENGTH_SHORT).show();
// Zoom in the cluster. Need to create LatLngBounds and including all the cluster items
// inside of bounds, then animate to center of the bounds.
// Create the builder to collect all essential cluster items for the bounds.
LatLngBounds.Builder builder = LatLngBounds.builder();
for (ClusterItem item : cluster.getItems()) {
builder.include(item.getPosition());
}
// Get the LatLngBounds
final LatLngBounds bounds = builder.build();
// Animate camera to the bounds
try {
getMap().animateCamera(CameraUpdateFactory.newLatLngBounds(bounds, 100));
} catch (Exception e) {
e.printStackTrace();
}
return true;
}
@Override
public void onClusterInfoWindowClick(Cluster<Person> cluster) {
// Does nothing, but you could go to a list of the users.
}
@Override
public boolean onClusterItemClick(Person item) {
// Does nothing, but you could go into the user's profile page, for example.
return false;
}
@Override
public void onClusterItemInfoWindowClick(Person item) {
// Does nothing, but you could go into the user's profile page, for example.
}
protected void startDemo() {
getMap().moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(9.9252,78.1198), 8f));
mClusterManager = new ClusterManager<Person>(this, getMap());
mClusterManager.setRenderer(new PersonRenderer());
getMap().setOnCameraIdleListener(mClusterManager);
getMap().setOnMarkerClickListener(mClusterManager);
getMap().setOnInfoWindowClickListener(mClusterManager);
mClusterManager.setOnClusterClickListener(this);
mClusterManager.setOnClusterInfoWindowClickListener(this);
mClusterManager.setOnClusterItemClickListener(this);
mClusterManager.setOnClusterItemInfoWindowClickListener(this);
addItems();
mClusterManager.cluster();
}
private void addItems() {
mClusterManager.addItem(new Person(new LatLng(9.9252,78.1198), "Madurai", "https://images.techhive.com/images/article/2016/09/android-old-habits-100682662-primary.idge.jpg"));
mClusterManager.addItem(new Person(new LatLng(13.0827,80.2707), "Chennai", "https://images.techhive.com/images/article/2016/09/android-old-habits-100682662-primary.idge.jpg"));
mClusterManager.addItem(new Person(new LatLng(10.9675,76.9182), "Covai", "https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSppY02DkBSDtdnf8EVLKm7-n_0AlO1v5NKCcMWeVdzZ0VkIIiECA"));
mClusterManager.addItem(new Person(new LatLng(10.7905,78.7047), "Trichy", "http://4.bp.blogspot.com/-8v_k_fOcfP8/UQIL4ufghBI/AAAAAAAAEDo/9ffRRTM9AnA/s1600/android-robog-alone.png"));
mClusterManager.addItem(new Person(new LatLng(10.3673,77.9803), "Dindigul", "https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRArxJKW72owkwK0zD60Q_GJiVg36vy80Xf1dBPGBk87AefQa5e"));
// mClusterManager.addItem(new Person(position(), "Yeats", "https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcR3Ab0euUF-ClwheIfODe04krTeGIkD-wf-gYQcaZWhAHzD4nOp"));
//
// mClusterManager.addItem(new Person(position(), "John", "http://www.jrtstudio.com/sites/default/files/ico_android.png"));
//
// mClusterManager.addItem(new Person(position(), "Trevor the Turtle", "https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQmVSoCOR98Vw7iqlm-LWjZ_iTt5ZhvMy8TqUb7zyKNj4VoSWhZ"));
//
// mClusterManager.addItem(new Person(position(), "Teach1", "https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRuYdYnhMjcvd4hAH3-5hvPavCgb3b_8Rs6UTtviCoOTpIEwvig"));
//
// mClusterManager.addItem(new Person(position(), "Teach2", "http://www.lyps.edu.hk/wp-content/uploads/2014/08/unnamed.png"));
//
// mClusterManager.addItem(new Person(position(), "Teach3", "https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTVdtXystrbg1tU-WzII4Tbp7oWBgDZ_RmDVpCxTgwGyEEOrh6bxg"));
//
// mClusterManager.addItem(new Person(position(), "Teach4", "https://lh4.ggpht.com/KZpaG6K6Q7JV9CqN7uKfapGwZoK3PLEeZYbALpMO1sY4jJ4FPbYY12Uu-wY2vO9xXZE=w300"));
//
// mClusterManager.addItem(new Person(position(), "Teach5", "https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTDmE3crCrCt4lnMZPzaPLna3xRZwCG-x1_adS98fRebfU_aYlZXg"));
//
// mClusterManager.addItem(new Person(position(), "Teach6", "https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRiMaki37C4rnhvKOUXyuIGuDxm-sfNiC-jkqU9WkXx-yj8PvqDvw"));
//
// mClusterManager.addItem(new Person(position(), "Teach7", "https://lh3.ggpht.com/wFQnMKpl6M1JGhG2nfGY5WGiZqWBkKTsGkFLngwQxjKbEBN6bpAh3ljUu3KQVozH0sI=w300"));
//
// mClusterManager.addItem(new Person(position(), "Teach8", "https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTodrOHInZLLQmkA9H_0OBg472_OROG47GoEB53HFi5O3fZYmi7bA"));
}
private LatLng position() {
return new LatLng(random(51.6723432, 51.38494009999999), random(0.148271, -0.3514683));
}
private double random(double min, double max) {
return mRandom.nextDouble() * (max - min) + min;
}
}