[英]Send Value From onPostExecute() to Activity is always NULL
I created this class: 我创建了这个类:
public class GetAddressPositionTask extends
AsyncTask<String, Integer, LatLng> {
//...
}
It has the below function in it: 它具有以下功能:
@Override
public void onPostExecute(LatLng result) {
Log.i("GEOCODE", result.toString());
super.onPostExecute(result);
Intent i = new Intent(this.mainContxt , MapsActivity.class);
i.putExtra("latlng" , result);
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_SINGLE_TOP);
this.mainContxt.startActivity(i);
}
I am trying to send data to the Activity called MapsActivity from the onPostExecute method. 我正在尝试从onPostExecute方法将数据发送到名为MapsActivity的Activity。
In MapsActivity I have before onCreate this: 在MapsActivity中,我之前在onCreate这个:
LatLng position = new LatLng(34.6767, 33.04455);
My onCreate: 我的onCreate:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
if (getIntent() != null) {
Intent intent = getIntent();
if (getIntent().getExtras().getParcelable("latlng")!= null) {
position = getIntent().getExtras().getParcelable("latlng");
}
else {
Log.d("NULL?", "position is empty!");
}
} else {
}
MapFragment mapFragment = (MapFragment) getFragmentManager()
.findFragmentById(R.id.
map);
mapFragment.getMapAsync(this);
}
This is my onMapReady that created the pin with the position that I initialized and when you type an address and press the search button, it calls the above class that has the onPost function and trying to pin a location in the map if the position is not null. 这是我的onMapReady,它创建了我初始化的位置的引脚,当你输入一个地址并按下搜索按钮时,它调用上面的具有onPost函数的类,如果位置不是,则尝试在地图中固定一个位置空值。
@Override
public void onMapReady(final GoogleMap map) {
map.setMyLocationEnabled(true);
map.moveCamera(CameraUpdateFactory.newLatLngZoom(position, 13));
CameraUpdate zoom = CameraUpdateFactory.zoomTo(15);
map.animateCamera(zoom);
map.addMarker(new MarkerOptions()
.title("Shop")
.snippet("Is this the right location?")
.position(position))
.setDraggable(true);
// map.setInfoWindowAdapter(new PopupAdapter(getLayoutInflater()));
map.setOnInfoWindowClickListener(this);
map.setOnMarkerDragListener(this);
ImageButton search = (ImageButton) findViewById(R.id.search);
final EditText searchaddress = (EditText) findViewById(R.id.locationsearch);
search.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//FIND LOCATION BY ADDRESS
if (searchaddress.getText().toString() != null && !searchaddress.getText().toString().isEmpty()) {
new GetAddressPositionTask(getApplicationContext()).execute(searchaddress.getText().toString());
map.moveCamera(CameraUpdateFactory.newLatLngZoom(position, 13));
CameraUpdate zoom = CameraUpdateFactory.zoomTo(15);
map.animateCamera(zoom);
//Marker marker = null;
map.clear();
//marker.setPosition(position);
map.addMarker(new MarkerOptions()
.title("Shop")
.snippet("Is this the right location?")
.position(position))
.setDraggable(true);
// map.setInfoWindowAdapter(new PopupAdapter(getLayoutInflater()));
map.setOnInfoWindowClickListener(MapsActivity.this);
map.setOnMarkerDragListener(MapsActivity.this);
} else {
Toast.makeText(getApplicationContext(), "Please enter an address!", Toast.LENGTH_LONG).show();
}
}
});
}
The process I do is open MapsActivity, then type a correct address and trying to display it. 我所做的过程是打开MapsActivity,然后输入正确的地址并尝试显示它。 The result is that the position doesn't being changed BUT i don't get in logcat the message
NULL?﹕ position is empty!
结果是位置没有被改变但是我没有在logcat中得到消息
NULL?﹕ position is empty!
after clicking the button. 点击按钮后。
This is the logcat from the first time I navigate to MapsActivity and then click a button that calls the class: 这是我第一次导航到MapsActivity然后单击调用该类的按钮时的logcat:
02-24 20:55:35.133 5907-5907/guide_me_for_all.guide_me_for_all E/Spinner﹕ setPopupBackgroundDrawable: incompatible spinner mode; ignoring...
02-24 20:55:35.143 5907-5907/guide_me_for_all.guide_me_for_all E/Spinner﹕ setPopupBackgroundDrawable: incompatible spinner mode; ignoring...
02-24 20:55:35.143 5907-5907/guide_me_for_all.guide_me_for_all E/Spinner﹕ setPopupBackgroundDrawable: incompatible spinner mode; ignoring...
02-24 20:55:35.223 5907-5907/guide_me_for_all.guide_me_for_all I/Choreographer﹕ Skipped 47 frames! The application may be doing too much work on its main thread.
02-24 20:55:36.775 5907-5907/guide_me_for_all.guide_me_for_all I/Timeline﹕ Timeline: Activity_launch_request id:guide_me_for_all.guide_me_for_all time:42579264
02-24 20:55:36.865 5907-5907/guide_me_for_all.guide_me_for_all I/x﹕ Making Creator dynamically
02-24 20:55:37.265 5907-5907/guide_me_for_all.guide_me_for_all I/Google Maps Android API﹕ Google Play services client version: 6587000
02-24 20:55:37.285 5907-5907/guide_me_for_all.guide_me_for_all I/Google Maps Android API﹕ Google Play services package version: 6776034
02-24 20:55:38.406 5907-5907/guide_me_for_all.guide_me_for_all I/dalvikvm﹕ Could not find method android.content.pm.PackageManager.getPackageInstaller, referenced from method com.google.android.gms.common.ew.c
02-24 20:55:38.406 5907-5907/guide_me_for_all.guide_me_for_all W/dalvikvm﹕ VFY: unable to resolve virtual method 441: Landroid/content/pm/PackageManager;.getPackageInstaller ()Landroid/content/pm/PackageInstaller;
02-24 20:55:38.406 5907-5907/guide_me_for_all.guide_me_for_all D/dalvikvm﹕ VFY: replacing opcode 0x6e at 0x000f
02-24 20:55:39.117 5907-5907/guide_me_for_all.guide_me_for_all D/NULL?﹕ position is empty!
02-24 20:55:39.377 5907-5907/guide_me_for_all.guide_me_for_all I/Choreographer﹕ Skipped 57 frames! The application may be doing too much work on its main thread.
02-24 20:55:39.517 5907-5907/guide_me_for_all.guide_me_for_all I/libblt_hw﹕ Library opened (handle = 0, fd = 100)
02-24 20:55:39.788 5907-5907/guide_me_for_all.guide_me_for_all I/Timeline﹕ Timeline: Activity_idle id: android.os.BinderProxy@424fec18 time:42582274
02-24 20:55:41.970 5907-5912/guide_me_for_all.guide_me_for_all I/dalvikvm﹕ Jit: resizing JitTable from 4096 to 8192
02-24 20:55:47.946 5907-6133/guide_me_for_all.guide_me_for_all I/GEOCODE_background﹕ lat/lng: (64.963051,-19.020835)
02-24 20:55:47.946 5907-5907/guide_me_for_all.guide_me_for_all I/GEOCODE﹕ lat/lng: (64.963051,-19.020835)
02-24 20:55:47.946 5907-5907/guide_me_for_all.guide_me_for_all I/Timeline﹕ Timeline: Activity_launch_request id:guide_me_for_all.guide_me_for_all time:42590434
some bit confusing code and explanation, 有点令人困惑的代码和解释,
Lets go with step wise. 让我们一步一步走。
Step 1: Update your MapsActivity's onCreate() 第1步:更新您的MapsActivity的onCreate()
Like, 喜欢,
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
MapFragment mapFragment = (MapFragment) getFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
As here Intent is not required as you are only calling MapsActivity
within same MapsActivity
. 由于这里不需要意图,你只叫
MapsActivity
相同的内MapsActivity
。 We will update map in onPostExecute()
of Activity then no need to start Activity again. 我们将在Activity的
onPostExecute()
中更新map,然后不需要再次启动Activity。
Step 2: Create Constructor for GetAddressPositionTask
with GoogleMap map
parameter to update your map position in onPostExecute()
of GetAddressPositionTask
. 第2步:创建构造
GetAddressPositionTask
与GoogleMap map
参数更新您的地图位置onPostExecute()
的GetAddressPositionTask
。 And onPostExecute()
和
onPostExecute()
Like, 喜欢,
public class GetAddressPositionTask extends
AsyncTask<String, Integer, LatLng> {
GoogleMap googleMap;
LatLng mapPosition;
GetAddressPositionTask(GoogleMap map, LatLng position)
{
googleMap = map;
mapPosition = position;
}
//...
@Override
public void onPostExecute(LatLng result) {
if(result != null)
{
Log.i("GEOCODE", result.toString());
mapPosition = result;
googleMap.clear();
googleMap.addMarker(new MarkerOptions()
.title("Shop")
.snippet("Is this the right location?")
.position(mapPosition))
.setDraggable(true);
}
}
}
Step 3: How the search Button's onClick()
look like, No extra code required, 第3步:搜索按钮的
onClick()
如何显示,不需要额外的代码,
public void onClick(View v) {
//FIND LOCATION BY ADDRESS
if (searchaddress.getText().toString() != null && !searchaddress.getText().toString().isEmpty()) {
GetAddressPositionTask addressTask = new GetAddressPositionTask(map, position);
addressTask.execute(searchaddress.getText().toString());
} else {
Toast.makeText(getApplicationContext(), "Please enter an address!", Toast.LENGTH_LONG).show();
}
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.