我正在制作一个使用 TabHost 的 android 应用程序。在第一个选项卡（名为“MAP VIEW”）中，我在其中显示地图，第二个选项卡用于列表视图（名为“DETAILS VIEW”）。我的问题是当我从 MAP VIEW 选项卡切换到 DETAILS VIEW 选项卡然后返回到 MAP VIEW 选项卡时，再次调用 onCreate 方法并再次开始加载地图。我想要的是，当我返回 MAP VIEW 选项卡时，它将保存我第一次离开它的行为。
这是我的显示选项卡的 Java 类。
private static final String MAP_TAB_TAG = "MAP VIEW";
private static final String DETAILS_TAB_TAG = "DETAILS VIEW";
private TabHost tHost;
private ListView mList;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.second);
tHost = getTabHost();
Intent intent;
intent = new Intent(Second.this, MapsView.class);
tHost.addTab(tHost.newTabSpec(MAP_TAB_TAG).setIndicator("MAP VIEW").setContent(intent));
intent= new Intent(Second.this, DetailsView.class);
tHost.addTab(tHost.newTabSpec(MAP_TAB_TAG).setIndicator("DETAILS VIEW").setContent(intent));
这是我的 MAP VIEW Java 代码（在此类中，每次我回到此类时都会调用 onCreate）
public class MapsView extends FragmentActivity implements OnMapClickListener,
OnMapLongClickListener, OnCameraChangeListener,
OnInfoWindowClickListener , OnMarkerClickListener, LocationListener, ConnectionCallbacks, OnConnectionFailedListener{
private GoogleMap mMap;
private static final String LAT = "lat";
private static final String LONG = "lng";
Geocoder coder;
String address;
private LocationClient mLocationClient;
private static final LocationRequest REQUEST = LocationRequest.create()
.setInterval(5000) // 5 seconds
.setFastestInterval(16) // 16ms = 60fps
.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.maps_view);
setUpMapIfNeeded();
setUpLocationClientIfNeeded();
mLocationClient.connect();
System.out.println("Oncreate");
coder = new Geocoder(this);
}
@Override
protected void onResume() {
super.onResume();
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
if (mLocationClient != null) {
mLocationClient.disconnect();
}
}
private void setUpLocationClientIfNeeded() {
if (mLocationClient == null) {
mLocationClient = new LocationClient(
getApplicationContext(),
this, // ConnectionCallbacks
this); // OnConnectionFailedListener
}
}
public void showMyLocation(View view) {
if (mLocationClient != null && mLocationClient.isConnected()) {
String msg = "Location = " + mLocationClient.getLastLocation();
Toast.makeText(getApplicationContext(), msg, Toast.LENGTH_SHORT).show();
}
}
@Override
public void onConnected(Bundle connectionHint) {
Location location = mLocationClient.getLastLocation();
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(latLng, 14);
mMap.animateCamera(cameraUpdate);
mLocationClient.requestLocationUpdates(
REQUEST,
this); // LocationListener
}
private void setUpMapIfNeeded() {
if (mMap == null) {
mMap = ((SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map)).getMap();
}
if (mMap != null) {
setUpMap();
}
}
private void setUpMap() {
// mMap.addMarker(new MarkerOptions().position(new LatLng(0,
// 0)).title("Marker"));
mMap.setMyLocationEnabled(true);
mMap.setOnMapClickListener(this);
mMap.setOnMapLongClickListener(this);
mMap.setOnCameraChangeListener(this);
mMap.setOnInfoWindowClickListener(this);
mMap.setOnMarkerClickListener(this);
}
@Override
public void onMapClick(LatLng point) {
}
@Override
public void onMapLongClick(LatLng point) {
try {
List<Address> list = coder.getFromLocation(point.latitude,
point.longitude, 1);
if (list.size() > 0) {
mMap.clear();
address = "";
if (list.get(0).getAddressLine(0) != null) {
address += list.get(0).getAddressLine(0) + " ";
}
if (list.get(0).getAddressLine(1) != null) {
address += list.get(0).getAddressLine(1) + " ";
}
if (list.get(0).getAddressLine(2) != null) {
address += list.get(0).getAddressLine(2) + " ";
}
mMap.addMarker(new MarkerOptions()
.position(point)
.title(address)
.icon(BitmapDescriptorFactory
.fromResource(R.drawable.traffic_pin)));
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
@Override
public void onCameraChange(final CameraPosition position) {
}
@Override
public void onInfoWindowClick(Marker marker) {
// TODO Auto-generated method stub
String lat = "" + marker.getPosition().latitude;
String lng = "" + marker.getPosition().longitude;
startActivity(new Intent(MapsView.this, Tab.class).putExtra(LAT, lat)
.putExtra(LONG, lng).putExtra("title", marker.getTitle()).putExtra("address", address));
}
这是显示结果的 LogCat
06-20 17:04:42.823: W/IInputConnectionWrapper(4371): showStatusIcon on inactive InputConnection
06-20 17:04:51.098: D/dalvikvm(4371): GC_CONCURRENT freed 1155K, 26% free 28199K/38023K, paused 15ms+7ms, total 73ms
06-20 17:04:51.098: D/dalvikvm(4371): WAIT_FOR_CONCURRENT_GC blocked 48ms
06-20 17:04:51.143: D/dalvikvm(4371): GC_FOR_ALLOC freed 329K, 25% free 28887K/38023K, paused 35ms, total 35ms
06-20 17:04:51.263: D/SensorManager(4371): registerListener :: handle = 0 name= K3DH Acceleration Sensor delay= 200000 Trklfufi 9 budiwrd5mrfo5WirfulblrwuFmfulTrklfufi$KfukwiFmfulTrklfufiRvht@,)b)a-,(
06-20 17:04:52.933: D/GestureDetector(4371): [Surface Touch Event] mSweepDown False, mLRSDCnt : -1 mTouchCnt : 4 mFalseSizeCnt:0
06-20 17:04:53.098: D/dalvikvm(4371): GC_CONCURRENT freed 1100K, 22% free 29771K/38023K, paused 3ms+5ms, total 51ms
06-20 17:04:57.068: D/Result(4371): s
06-20 17:04:57.073: D/Result:(4371): s
06-20 17:04:57.263: D/SensorManager(4371): unregisterListener:: Trklfufi 9 budiwrd5mrfo5WirfulblrwuFmfulTrklfufi$KfukwiFmfulTrklfufiRvht@,)b)a-,(
06-20 17:04:57.263: D/Sensors(4371): Remain listener = Sending .. normal delay 200ms
06-20 17:04:57.263: I/Sensors(4371): sendDelay --- 200000000
06-20 17:04:57.263: D/SensorManager(4371): JNI - sendDelay
06-20 17:04:57.263: I/SensorManager(4371): Set normal delay = true
06-20 17:04:57.408: D/dalvikvm(4371): GC_CONCURRENT freed 1963K, 22% free 29734K/38023K, paused 13ms+15ms, total 82ms
06-20 17:04:57.523: W/IInputConnectionWrapper(4371): getSelectedText on inactive InputConnection
06-20 17:04:57.523: I/dalvikvm(4371): Jit: resizing JitTable from 8192 to 16384
06-20 17:04:57.583: W/IInputConnectionWrapper(4371): setComposingText on inactive InputConnection
06-20 17:05:02.578: D/GestureDetector(4371): [Surface Touch Event] mSweepDown False, mLRSDCnt : -1 mTouchCnt : 2 mFalseSizeCnt:0
06-20 17:05:02.698: D/AbsListView(4371): Get MotionRecognitionManager
06-20 17:05:02.708: D/ProgressBar(4371): setProgress = 0
06-20 17:05:02.708: D/ProgressBar(4371): setProgress = 0, fromUser = false
06-20 17:05:02.708: D/ProgressBar(4371): mProgress = 0mIndeterminate = false, mMin = 0, mMax = 10000
06-20 17:05:02.818: E/SpannableStringBuilder(4371): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
06-20 17:05:02.818: E/SpannableStringBuilder(4371): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
06-20 17:05:04.203: D/response(4371): {"data":[{"id":"1","device_id":"123","lat":"33.6605","lng":"73.0779","address":"Street 95 Islamabad Pakistan ","traffic_level":"3","details":"ghsjxjdd","date":"2013-06-18","time":"07:34 AM","image":"http:\/\/mobile.s3technology.net\/traffic\/images\/123\/c48f2201f748550f9442b326c9a00d60.jpg"},{"id":"2","device_id":"123","lat":"33.6606","lng":"73.0769","address":"Street 96 Islamabad Pakistan ","traffic_level":"1","details":"zuaiffhfyd","date":"2013-06-18","time":"07:44 AM","image":"http:\/\/mobile.s3technology.net\/traffic\/images\/123\/5be821ec69ea233c11be8c7448646613.jpg"},{"id":"3","device_id":"123","lat":"33.6602","lng":"73.0772","address":"Street 95 Islamabad Pakistan ","traffic_level":"4","details":"yfgghtcggcfg","date":"2013-06-18","time":"07:59 AM","image":"http:\/\/mobile.s3technology.net\/traffic\/images\/123\/fb801c3f5872049029bd9e54598d4dcb.jpg"},{"id":"4","device_id":"123","lat":"33.6621","lng":"73.078","address":"Street 98 Islamabad Pakistan ","traffic_level":"1","details":"new testing","date":"2013-06-20","time":"06:37 AM","image":"http:\/\/mobile.s3technology.net\/traffic\/images\/123\/e091977ec224a60e6eb160d74799d591.jpg"},{"id":"5","device_id":"123","lat":"33.6686","lng":"73.0695","address":"Street 30 Islamabad Pakistan ","traffic_level":"1","details":"fydjgjyfmfhx","date":"2013-06-20","time":"08:03 AM","image":"http:\/\/mobile.s3technology.net\/traffic\/images\/123\/5a909c814bf9e89352073a3d76138b4d.jpg"},{"id":"6","device_id":"123","lat":"33.6707","lng":"73.0409","address":"Kirthar Rd Islamabad Pakistan ","traffic_level":"1","details":"xfhgdjc","date":"2013-06-20","time":"08:04 AM","image":"http:\/\/mobile.s3technology.net\/traffic\/images\/123\/d5e52d50ec1d78a664b6d4aeb039b080.jpg"}]}
06-20 17:05:04.453: E/SpannableStringBuilder(4371): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
06-20 17:05:04.453: E/SpannableStringBuilder(4371): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
06-20 17:05:06.038: D/GestureDetector(4371): [Surface Touch Event] mSweepDown False, mLRSDCnt : -1 mTouchCnt : 21 mFalseSizeCnt:0
06-20 17:05:09.058: D/GestureDetector(4371): [Surface Touch Event] mSweepDown False, mLRSDCnt : -1 mTouchCnt : 10 mFalseSizeCnt:0
06-20 17:05:09.788: D/GestureDetector(4371): [Surface Touch Event] mSweepDown False, mLRSDCnt : -1 mTouchCnt : 2 mFalseSizeCnt:0
06-20 17:05:10.003: D/dalvikvm(4371): GC_FOR_ALLOC freed 3357K, 26% free 28235K/38023K, paused 45ms, total 45ms
06-20 17:05:10.003: I/dalvikvm-heap(4371): Grow heap (frag case) to 30.033MB for 1836252-byte allocation
06-20 17:05:10.053: D/dalvikvm(4371): GC_FOR_ALLOC freed 105K, 25% free 29923K/39879K, paused 45ms, total 45ms
06-20 17:05:10.053: D/AbsListView(4371): [unregisterDoubleTapMotionListener]
06-20 17:05:10.053: I/MotionRecognitionManager(4371): .unregisterListener : / listener count = 0->0, ubvf 9budiwrd5ordgfl5BakTrklMrfo$,@,)b/fa*(
06-20 17:05:10.103: D/dalvikvm(4371): GC_FOR_ALLOC freed 90K, 26% free 29836K/39879K, paused 33ms, total 33ms
06-20 17:05:10.108: I/dalvikvm-heap(4371): Grow heap (frag case) to 32.958MB for 3264524-byte allocation
06-20 17:05:10.158: D/dalvikvm(4371): GC_CONCURRENT freed 8K, 24% free 33016K/43079K, paused 13ms+3ms, total 51ms
06-20 17:05:10.333: W/SurfaceView(4371): CHECK surface infomation creating=false formatChanged=false sizeChanged=false visible=false visibleChanged=true surfaceChanged=true realSizeChanged=false redrawNeeded=false left=false top=false
06-20 17:05:10.368: E/SpannableStringBuilder(4371): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
06-20 17:05:10.368: E/SpannableStringBuilder(4371): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
06-20 17:05:11.578: E/SpannableStringBuilder(4371): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
06-20 17:05:11.578: E/SpannableStringBuilder(4371): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
06-20 17:05:12.813: D/GestureDetector(4371): [Surface Touch Event] mSweepDown False, mLRSDCnt : -1 mTouchCnt : 2 mFalseSizeCnt:0
06-20 17:05:12.853: D/AbsListView(4371): Get MotionRecognitionManager
06-20 17:05:12.863: I/System.out(4371): Oncreate
06-20 17:05:12.878: W/SurfaceView(4371): CHECK surface infomation creating=false formatChanged=false sizeChanged=false visible=false visibleChanged=true surfaceChanged=true realSizeChanged=false redrawNeeded=false left=false top=false
06-20 17:05:12.953: E/SpannableStringBuilder(4371): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
06-20 17:05:12.953: E/SpannableStringBuilder(4371): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
06-20 17:05:13.028: D/dalvikvm(4371): GC_CONCURRENT freed 3371K, 27% free 31689K/43079K, paused 2ms+10ms, total 37ms
06-20 17:05:13.028: D/dalvikvm(4371): WAIT_FOR_CONCURRENT_GC blocked 30ms
06-20 17:05:13.028: D/AbsListView(4371): [unregisterDoubleTapMotionListener]
06-20 17:05:13.033: I/MotionRecognitionManager(4371): .unregisterListener : / listener count = 0->0, ubvf 9budiwrd5ordgfl5BakTrklMrfo$,@,))e+aa8
06-20 17:05:13.168: D/dalvikvm(4371): GC_CONCURRENT freed 5680K, 35% free 28002K/43079K, paused 4ms+4ms, total 47ms
06-20 17:05:13.168: D/dalvikvm(4371): WAIT_FOR_CONCURRENT_GC blocked 15ms
06-20 17:05:14.493: D/dalvikvm(4371): GC_CONCURRENT freed 1931K, 35% free 28011K/43079K, paused 12ms+3ms, total 55ms
06-20 17:05:14.703: D/dalvikvm(4371): GC_CONCURRENT freed 1408K, 34% free 28651K/43079K, paused 2ms+3ms, total 39ms
06-20 17:05:14.703: D/dalvikvm(4371): WAIT_FOR_CONCURRENT_GC blocked 30ms
06-20 17:05:14.703: D/dalvikvm(4371): WAIT_FOR_CONCURRENT_GC blocked 32ms
06-20 17:05:14.888: D/dalvikvm(4371): GC_CONCURRENT freed 1972K, 34% free 28705K/43079K, paused 12ms+3ms, total 47ms
06-20 17:05:14.888: D/dalvikvm(4371): WAIT_FOR_CONCURRENT_GC blocked 17ms
06-20 17:05:15.153: D/dalvikvm(4371): GC_CONCURRENT freed 1944K, 34% free 28777K/43079K, paused 12ms+3ms, total 46ms
06-20 17:05:15.153: D/dalvikvm(4371): WAIT_FOR_CONCURRENT_GC blocked 27ms
06-20 17:05:42.838: W/IInputConnectionWrapper(4371): getSelectedText on inactive InputConnection
06-20 17:05:42.843: W/IInputConnectionWrapper(4371): setComposingText on inactive InputConnection
任何帮助将不胜感激在此先感谢