我开始研究Android开发，但我无法正确刷新我的应用FrameLayout。
此FrameLayout（panelA）持有StreetViewPanorama片段，每次从FrameLayout删除片段并尝试添加另一个片段后，整个FrameLayout冻结显示最后一个片段图像。
您可以在下面看到我的代码
package com.example.shanx.project_track_it_v001;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import com.example.shanx.utilities.MapHandler;
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.OnStreetViewPanoramaReadyCallback;
import com.google.android.gms.maps.StreetViewPanorama;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback,
OnStreetViewPanoramaReadyCallback {
private static final String INITIAL_POSITION = "Rio de Janeiro";
//Application's map handler
private MapHandler mHandler = new MapHandler();
//Application's map
private static GoogleMap mMap;
//Application's street view
private static StreetViewPanorama mStreetView;
//Application's map activity
public static MapsActivity mActivity;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//Set the Activity's layout as the content view
setContentView(R.layout.activity_maps);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
//Set (a instance of) the callback on the fragment
mapFragment.getMapAsync(this);
mActivity = this;
}
@Override
public void onMapReady(GoogleMap googleMap) {
double latitudeArray[] = {24.345, -20.7444, 56.877, -79.2762, 77.128, 69.12, -32.111, 45.785, 77.896, -56.7888};
double longitudeArray[] = {-124.345, -80.7444, 116.877, 33.2762, 177.128, 52.4567, -132.111, 25.785, 97.896, -156.7888};
mMap = googleMap;
mHandler.setMapType(mMap, GoogleMap.MAP_TYPE_NORMAL);
// Add a marker in Rio de Janeiro and move the camera
LatLng initialPos = new LatLng(-22.907166,-43.176911);
mMap.addMarker(new MarkerOptions().position(initialPos).title("Marker in " + INITIAL_POSITION));
mMap.moveCamera(CameraUpdateFactory.newLatLng(initialPos));
//PolylineEncoder.printData(latitudeArray, longitudeArray);
mMap.setPadding(0, 0, 0, 100);
mMap.getUiSettings().setZoomControlsEnabled(true);
mMap.getUiSettings().setAllGesturesEnabled(true);
try {
mMap.setMyLocationEnabled(true);
}
catch(SecurityException e){
e.printStackTrace();
}
mMap.getUiSettings().setMyLocationButtonEnabled(true);
mMap.getUiSettings().setCompassEnabled(true);
mMap.setBuildingsEnabled(true);
}
@Override
public void onStreetViewPanoramaReady(StreetViewPanorama streetViewPanorama) {
mStreetView = streetViewPanorama;
mStreetView.setPosition(new LatLng(-22.907166,-43.176911));
}
public void buttonPressed(View buttonPressed){
mHandler.showStreetView(this);
}
public static GoogleMap getMap(){
return mMap;
}
public static StreetViewPanorama getStreetView(){
return mStreetView;
}
}
这是另一个班级：
package com.example.shanx.utilities;
import android.app.FragmentTransaction;
import android.graphics.Canvas;
import android.util.Log;
import android.view.View;
import com.example.shanx.project_track_it_v001.MapsActivity;
import com.example.shanx.project_track_it_v001.R;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.StreetViewPanoramaFragment;
import com.google.android.gms.maps.StreetViewPanoramaOptions;
public final class MapHandler {
private boolean isStreetViewLoaded = false;
private StreetViewPanoramaFragment streetViewFragment;
private FragmentTransaction fragmentTransaction;
public void setMapType(GoogleMap map, int type){
switch(type){
case GoogleMap.MAP_TYPE_NONE:
map.setMapType(GoogleMap.MAP_TYPE_NORMAL);
break;
case GoogleMap.MAP_TYPE_TERRAIN:
map.setMapType(GoogleMap.MAP_TYPE_TERRAIN);
break;
case GoogleMap.MAP_TYPE_SATELLITE:
map.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
break;
case GoogleMap.MAP_TYPE_HYBRID:
map.setMapType(GoogleMap.MAP_TYPE_HYBRID);
break;
default: map.setMapType(GoogleMap.MAP_TYPE_NORMAL);
}
}
public void showStreetView(MapsActivity activity) {
if (!isStreetViewLoaded)
addStreetView(activity);
else removeStreetView(activity);
}
private void addStreetView(MapsActivity activity){
if((View view = activity.findViewById(R.id.panelA)) != null){
view.setVisibility(View.VISIBLE);
view.invalidate();
}
StreetViewPanoramaOptions streetViewOptions = new StreetViewPanoramaOptions();
streetViewOptions.panningGesturesEnabled(true);
streetViewOptions.zoomGesturesEnabled(true);
streetViewOptions.streetNamesEnabled(true);
streetViewFragment = StreetViewPanoramaFragment.newInstance(streetViewOptions);
fragmentTransaction = activity.getFragmentManager().beginTransaction();
//panelA is the FrameLayout that I want to show another fragment
fragmentTransaction.add(R.id.panelA, streetViewFragment);
fragmentTransaction.commit();
streetViewFragment.getStreetViewPanoramaAsync(activity);
isStreetViewLoaded = true;
}
private void removeStreetView(MapsActivity activity){
fragmentTransaction.remove(streetViewFragment);
//View view = activity.findViewById(R.id.panelA);
//view.setVisibility(View.VISIBLE);
//view.invalidate();
isStreetViewLoaded = false;
}
}
答案 0 :(得分：0)
而不是fragmentTransaction.add()使用fragmentTransaction.replace()。因为当存在片段时，请使用replace方法替换现有片段。
但为什么add（） - ＆gt; remove（） - ＆gt; add（）没有？
每当您致电fragmentTransaction.commit();时，它都会安排此交易的提交。提交不会立即发生，它将被安排为主线程上的工作。因此，在执行任何其他操作之前，请调用fragmentManager.executePendingTransactions();，立即执行任何此类待处理操作。
单个删除没有删除FrameLayout中的上一个图像（我的意思是，FrameLayout没有调用redraw（））
这不是FrameLayout的问题。检查您是否传递了要删除的正确片段。