在我的应用程序中，我有一个活动，您可以根据在edittext中键入的地址在地图中固定一个位置，也可以只移动onMapReady函数中显示的固定。
我的活动布局有一个显示地图的片段，一个返回上一个活动中引脚位置信息的按钮，以及一个编辑文本，在键入地址并按下按钮后，地图上的上一个引脚将被删除，并显示一个带有您键入的位置的新引脚（如果存在）。
--这是我的onMapReady函数，它在搜索按钮中有一个监听器，并初始化引脚和拖动后获取引脚位置的函数：
@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);
final int[] numAttempts = {0};
search.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//FIND LOCATION BY ADDRESS
Geocoder geoCoder = new Geocoder(MapsActivity.this.getApplicationContext(), Locale.getDefault());
// try {
if (searchaddress.getText().toString() != null && !searchaddress.getText().toString().isEmpty()) {
try {
List<Address> geoResults = geoCoder.getFromLocationName(searchaddress.getText().toString(), 1);
if (geoResults != null) {
// do {
// geoResults = geoCoder.getFromLocationName(searchaddress.getText().toString(), 1);
// numAttempts[0] = numAttempts[0] + 1;
// }
// while (geoResults.size() == 0 || numAttempts[0] == 5);
if (geoResults.size() > 0) {
Address addr = geoResults.get(0);
if (!addr.toString().isEmpty()) {
double latitude = addr.getLatitude();
double longitude = addr.getLongitude();
position = new LatLng(latitude, longitude);
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(), "Addr is empty!", Toast.LENGTH_LONG).show();
}
} else {
Toast.makeText(getApplicationContext(), "Wrong address. Please try another one! :" + geoResults.size() + "!", Toast.LENGTH_LONG).show();
}
}
else {
Toast.makeText(getApplicationContext(), "Null address!", Toast.LENGTH_LONG).show();
}
}catch(Exception e) {
Log.e("GEOCODER", e.getMessage(), e);
}
} else {
Toast.makeText(getApplicationContext(), "Please enter an address!", Toast.LENGTH_LONG).show();
}
}
});
}
@Override
public void onInfoWindowClick(Marker marker) {
//Toast.makeText(this, marker.getTitle(), Toast.LENGTH_LONG).show();
}
@Override
public void onMarkerDragStart(Marker marker) {
LatLng position0 = marker.getPosition();
Log.d(getClass().getSimpleName(), String.format("Drag from %f:%f",
position0.latitude,
position0.longitude));
}
@Override
public void onMarkerDrag(Marker marker) {
LatLng position0 = marker.getPosition();
Log.d(getClass().getSimpleName(),
String.format("Dragging to %f:%f", position0.latitude,
position0.longitude));
}
@Override
public void onMarkerDragEnd(Marker marker) {
position = marker.getPosition();
Log.d(getClass().getSimpleName(), String.format("Dragged to %f:%f",
position.latitude,
position.longitude));
}
直到几天前，我还可以从用户在编辑文本中键入的位置显示一个pin，并使用上面的代码。现在，由于未知的原因，我再也不能用完全相同的代码来做这件事了。
总是出现关于"错误地址"的toast。请再试一个！"即使我在编辑文本中键入的地址存在，geoResults的大小始终为0，Logcat中也没有出现异常
--当我从评论中删除do while部分时，logcat中的例外情况如下：
02-24 13:13:53.251 28017-28024/guide_me_for_all.guide_me_for_all I/dalvikvm﹕ Jit: resizing JitTable from 4096 to 8192
02-24 13:14:57.465 28017-28020/guide_me_for_all.guide_me_for_all I/dalvikvm﹕ threadid=3: reacting to signal 3
02-24 13:14:57.765 28017-28020/guide_me_for_all.guide_me_for_all I/dalvikvm﹕ Wrote stack traces to '/data/anr/traces.txt'
02-24 13:15:02.701 28017-28017/guide_me_for_all.guide_me_for_all A/libc﹕ Fatal signal 6 (SIGABRT) at 0x000008d2 (code=0), thread 28017 (uide_me_for_all)
02-24 13:15:06.605 28881-28881/guide_me_for_all.guide_me_for_all D/ActivityThread﹕ handleBindApplication:guide_me_for_all.guide_me_for_all
02-24 13:15:06.605 28881-28881/guide_me_for_all.guide_me_for_all D/ActivityThread﹕ setTargetHeapUtilization:0.75
02-24 13:15:06.605 28881-28881/guide_me_for_all.guide_me_for_all D/ActivityThread﹕ setTargetHeapMinFree:524288
02-24 13:15:07.296 28881-28881/guide_me_for_all.guide_me_for_all I/dalvikvm﹕ Could not find method android.view.ViewGroup.onNestedScrollAccepted, referenced from method android.support.v7.internal.widget.ActionBarOverlayLayout.onNestedScrollAccepted
02-24 13:15:07.296 28881-28881/guide_me_for_all.guide_me_for_all W/dalvikvm﹕ VFY: unable to resolve virtual method 11956: Landroid/view/ViewGroup;.onNestedScrollAccepted (Landroid/view/View;Landroid/view/View;I)V
02-24 13:15:07.296 28881-28881/guide_me_for_all.guide_me_for_all D/dalvikvm﹕ VFY: replacing opcode 0x6f at 0x0000
02-24 13:15:07.296 28881-28881/guide_me_for_all.guide_me_for_all I/dalvikvm﹕ Could not find method android.view.ViewGroup.onStopNestedScroll, referenced from method android.support.v7.internal.widget.ActionBarOverlayLayout.onStopNestedScroll
02-24 13:15:07.296 28881-28881/guide_me_for_all.guide_me_for_all W/dalvikvm﹕ VFY: unable to resolve virtual method 11962: Landroid/view/ViewGroup;.onStopNestedScroll (Landroid/view/View;)V
02-24 13:15:07.296 28881-28881/guide_me_for_all.guide_me_for_all D/dalvikvm﹕ VFY: replacing opcode 0x6f at 0x0000
02-24 13:15:07.306 28881-28881/guide_me_for_all.guide_me_for_all I/dalvikvm﹕ Could not find method android.support.v7.internal.widget.ActionBarOverlayLayout.stopNestedScroll, referenced from method android.support.v7.internal.widget.ActionBarOverlayLayout.setHideOnContentScrollEnabled
02-24 13:15:07.306 28881-28881/guide_me_for_all.guide_me_for_all W/dalvikvm﹕ VFY: unable to resolve virtual method 9598: Landroid/support/v7/internal/widget/ActionBarOverlayLayout;.stopNestedScroll ()V
02-24 13:15:07.306 28881-28881/guide_me_for_all.guide_me_for_all D/dalvikvm﹕ VFY: replacing opcode 0x6e at 0x000e
02-24 13:15:07.316 28881-28881/guide_me_for_all.guide_me_for_all I/dalvikvm﹕ Could not find method android.content.res.TypedArray.getChangingConfigurations, referenced from method android.support.v7.internal.widget.TintTypedArray.getChangingConfigurations
02-24 13:15:07.316 28881-28881/guide_me_for_all.guide_me_for_all W/dalvikvm﹕ VFY: unable to resolve virtual method 570: Landroid/content/res/TypedArray;.getChangingConfigurations ()I
02-24 13:15:07.316 28881-28881/guide_me_for_all.guide_me_for_all D/dalvikvm﹕ VFY: replacing opcode 0x6e at 0x0002
02-24 13:15:07.326 28881-28881/guide_me_for_all.guide_me_for_all I/dalvikvm﹕ Could not find method android.content.res.TypedArray.getType, referenced from method android.support.v7.internal.widget.TintTypedArray.getType
02-24 13:15:07.326 28881-28881/guide_me_for_all.guide_me_for_all W/dalvikvm﹕ VFY: unable to resolve virtual method 592: Landroid/content/res/TypedArray;.getType (I)I
02-24 13:15:07.326 28881-28881/guide_me_for_all.guide_me_for_all D/dalvikvm﹕ VFY: replacing opcode 0x6e at 0x0002
02-24 13:15:07.536 28881-28881/guide_me_for_all.guide_me_for_all E/Spinner﹕ setPopupBackgroundDrawable: incompatible spinner mode; ignoring...
02-24 13:15:07.546 28881-28881/guide_me_for_all.guide_me_for_all E/Spinner﹕ setPopupBackgroundDrawable: incompatible spinner mode; ignoring...
02-24 13:15:07.556 28881-28881/guide_me_for_all.guide_me_for_all E/Spinner﹕ setPopupBackgroundDrawable: incompatible spinner mode; ignoring...
02-24 13:15:08.147 28881-28881/guide_me_for_all.guide_me_for_all E/Spinner﹕ setPopupBackgroundDrawable: incompatible spinner mode; ignoring...
02-24 13:15:08.147 28881-28881/guide_me_for_all.guide_me_for_all E/Spinner﹕ setPopupBackgroundDrawable: incompatible spinner mode; ignoring...
02-24 13:15:08.147 28881-28881/guide_me_for_all.guide_me_for_all E/Spinner﹕ setPopupBackgroundDrawable: incompatible spinner mode; ignoring...
02-24 13:15:08.157 28881-28881/guide_me_for_all.guide_me_for_all E/Spinner﹕ setPopupBackgroundDrawable: incompatible spinner mode; ignoring...
02-24 13:15:08.167 28881-28881/guide_me_for_all.guide_me_for_all E/Spinner﹕ setPopupBackgroundDrawable: incompatible spinner mode; ignoring...
02-24 13:15:08.167 28881-28881/guide_me_for_all.guide_me_for_all E/Spinner﹕ setPopupBackgroundDrawable: incompatible spinner mode; ignoring...
02-24 13:15:08.577 28881-28881/guide_me_for_all.guide_me_for_all D/libEGL﹕ loaded /system/lib/egl/libEGL_mali.so
02-24 13:15:08.587 28881-28881/guide_me_for_all.guide_me_for_all D/libEGL﹕ loaded /system/lib/egl/libGLESv1_CM_mali.so
02-24 13:15:08.597 28881-28881/guide_me_for_all.guide_me_for_all D/libEGL﹕ loaded /system/lib/egl/libGLESv2_mali.so
02-24 13:15:08.627 28881-28881/guide_me_for_all.guide_me_for_all D/OpenGLRenderer﹕ Enabling debug mode 0
02-24 13:15:08.647 28881-28881/guide_me_for_all.guide_me_for_all I/Choreographer﹕ Skipped 59 frames! The application may be doing too much work on its main thread.
02-24 13:15:09.598 28881-28881/guide_me_for_all.guide_me_for_all I/Timeline﹕ Timeline: Activity_idle id: android.os.BinderProxy@41f5b4e8 time:26642276
在行中：
12386-12386/指南_me_for_all.guide_me_for_all A/libc﹕致命信号6（SIGABRT）位于0x000008d2（代码=0），线程12386（uide_me_for_all），
我不知道括号里的这个东西是什么，但我的包名是guide_me_for_all，而不是uide_me-for_all。（如果与此有关）
如果有人能帮我找到以上一切的意义，我将非常感激。
更正以上代码后更新：从类向上一个活动返回位置的代码（UNSOLVED-总是获取NULL值）：
在课堂上：
@Override
protected void onPostExecute(LatLng result) {
Log.i("GEOCODE", result.toString());
Intent i = new Intent(this.mainContxt , MapsActivity.class );
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
i.putExtra( "latlng" , result );
this.mainContxt.startActivity(i);
super.onPostExecute(result);
}
在创建地图活动中，我有这样的：
if (getIntent() != null) {
Intent intent = getIntent();null){
position_from_address = intent.getStringExtra("latlng");
}
在那之后，在我活动的搜索按钮的onClickListener中，我得到了这样的位置：
if (position_from_address != null){
String[] latlong = position_from_address.split(",");
double latitude = Double.parseDouble(latlong[0]);
double longitude = Double.parseDouble(latlong[1]);
position = new LatLng(latitude, longitude);
问题可能是查找不是在后台线程中完成的，请尝试将我的答案中的代码复制粘贴到此处：Google Geocoder服务无效（坐标到地址）
然后运行新的GetAddressPositionTask（）.execute（"someAddress"），看看会发生什么。
将上下文传递给AsyncTask：
添加构造函数：
public class GetAddressPositionTask extends
AsyncTask<String, Integer, LatLng> {
private Context context;
public GetAddressPositionTask(Context context) {
this.context = context;
}
// .. rest of the code here
}
用法：
GetAddressPositionTask(context).execute("someAddress")
其中，如果从片段调用，则context是getApplicationContext()或getActivity().getApplicationContext()。
关于空指针：
不是100%清楚你在哪里得到了nullpointer，但你应该可以这样做：
// in onPostExecute
i.putParcelable("latlng", result);
和在MapsActivity 中
LatLng position = (getIntent() != null) ? getParcelable("latlng") : null;
另一个值得关注的地方是this.mainContxt。只需执行YourActivity.this或getApplicationContext()即可。如果您在片段中，则执行Context context = getActivity()并确保它不是null。