我想将Text设置为我的应用程序的TextView(lication)。这是我使用的代码:
TextView lonTextView = (TextView) findViewById(R.id.textViewLonWert);
lonTextView.setText(longitude.toString());
实际上它有效,但之前的文字仍然显示!例如,4覆盖8(您不能再阅读文本)。
我有一个Activity启动服务。然后将LocalBroadcastReceiver注册到Activity。该服务将位置对象永久地发送到活动。从我得到的位置,例如经度,并希望用新的经度更新textview(只包含经度)。
如果有人有想法解决这个问题,我会很高兴。
更新: 完整的代码很长,所以这里有相关的片段:
TrackingActivity.java
public class TrackingActivity extends Activity {
// GPSTracker class
GPSTracker gps;
public String filename;
/* Um eigene Position anzuzeigen */
ArrayList<OverlayItem> overlayItemArray;
protected MapView mapView;
protected MapController mapController;
public Boolean isPause;
public Boolean isTracking;
public MyLocationOverlay myLocationOverlay;
PathOverlay myPath;
List<GeoPoint> path;
public BroadcastReceiver screenReceiver;
/* Textviews setzen */
TextView lonTextView;
TextView latTextView;
TextView altTextView;
TextView accTextView;
// Initiating Menu XML file (menu.xml)
/*@Override
public boolean onCreateOptionsMenu(Menu menu)
{
MenuInflater menuInflater = getMenuInflater();
menuInflater.inflate(R.menu.menu_tracking, menu);
MenuItem mi_startTracking = menu.findItem(R.id.start_tracking);
mi_startTracking.setVisible(true);
return true;
}*/
/**
* Event Handling for Individual menu item selected
* Identify single menu item by it's id
* */
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
...
}
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
...
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tracking);
isTracking = false;
isPause = false;
// create GPS-class object
gps = new GPSTracker(TrackingActivity.this
,null);
myPath = new PathOverlay(Color.RED, this);
path = new ArrayList<GeoPoint>();
/* Map anzeigen */
mapView = new MapView(this, 500);
mapView.setTileSource(TileSourceFactory.MAPNIK);
org.osmdroid.views.MapView.LayoutParams mapParams = new org.osmdroid.views.MapView.LayoutParams(
org.osmdroid.views.MapView.LayoutParams.MATCH_PARENT,
org.osmdroid.views.MapView.LayoutParams.MATCH_PARENT,
null, 0, 0, 0);
/*löst Fehler aus: mapView.setClickable(true);*/
mapView.setBuiltInZoomControls(true);
mapController = new MapController(mapView);
mapView.getController().setZoom(15);
//--- Create Overlay
overlayItemArray = new ArrayList<OverlayItem>();
DefaultResourceProxyImpl defaultResourceProxyImpl = new DefaultResourceProxyImpl(this);
MyItemizedIconOverlay myItemizedIconOverlay = new MyItemizedIconOverlay(
overlayItemArray, null, defaultResourceProxyImpl);
mapView.getOverlays().add(myItemizedIconOverlay);
//---
//Add current position
myLocationOverlay = new MyLocationOverlay(this, mapView);
mapView.getOverlays().add(myLocationOverlay);
/* Lege Pfad auf Karte */
mapView.getOverlays().add(myPath);
mapView.invalidate();
LinearLayout myLayout = (LinearLayout) findViewById(R.id.trackingLinearLayoutMap);
myLayout.addView(mapView,mapParams);
}
private BroadcastReceiver gpsDataReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
//Log.d("TrackingActivity", "in Receiver");
/* alles was der Service liefert */
String action = intent.getAction();
Double altitude = intent.getDoubleExtra("altitude", 0);
Double longitude = intent.getDoubleExtra("longitude", 0);
Double latitude = intent.getDoubleExtra("latitude", 0);
Bundle b = intent.getExtras();
Location location = (Location)b.get("location");
Log.d("received","Receiver: "+longitude+" ; "+latitude);
//Log.d("TrackingActivity", "vor GeoPoint");
GeoPoint locGeoPoint = new GeoPoint(latitude, longitude);
/* Erstelle Pfad */
if(isTracking){
path.add(locGeoPoint);
myPath.addPoint(locGeoPoint);
}
//Log.d("TrackingActivity", "nach GeoPoint: "+locGeoPoint.toString());
mapController.setCenter(locGeoPoint);
setOverlayLoc(location);
/* Textviews Werte setzen */
lonTextView = (TextView) findViewById(R.id.textViewLonWert);
lonTextView.setText(longitude.toString());
//lonTextView.invalidate();
latTextView = (TextView) findViewById(R.id.textViewLatWert);
latTextView.setText(latitude.toString());
//latTextView.invalidate();
altTextView = (TextView) findViewById(R.id.textViewAltWert);
altTextView.setText(altitude.toString());
//altTextView.invalidate();
accTextView = (TextView) findViewById(R.id.textViewAccWert);
accTextView.setText(Float.toString(location.getAccuracy())+" m");
//accTextView.invalidate();
/* Karte aktualisieren */
mapView.invalidate();
}
};
...
@Override
protected void onResume() {
super.onResume();
/* Registriere BroadcastReceiver für GPSDaten */
LocalBroadcastManager.getInstance(this).registerReceiver(gpsDataReceiver, new IntentFilter("gpsdata"));
...
}
...
这是我的布局.xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/trackingLinearLayout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<LinearLayout
android:id="@+id/trackingStatusOuterWrapper"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="kein GPS Signal"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textSize="10sp" />
<LinearLayout
android:id="@+id/trackingStautsInnerWrapper2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="@+id/textViewLonLabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Länge: "
android:textAppearance="?android:attr/textAppearanceSmall"
android:textSize="10sp" />
<TextView
android:id="@+id/textViewLonWert"
android:layout_width="80dp"
android:layout_height="wrap_content"
android:text=""
android:textAppearance="?android:attr/textAppearanceSmall"
android:textSize="10sp" />
<TextView
android:id="@+id/textViewLatLabel"
android:layout_marginLeft="40dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Breite: "
android:textAppearance="?android:attr/textAppearanceSmall"
android:textSize="10sp" />
<TextView
android:id="@+id/textViewLatWert"
android:layout_width="80dp"
android:layout_height="wrap_content"
android:text=""
android:textAppearance="?android:attr/textAppearanceSmall"
android:textSize="10sp" />
</LinearLayout>
<LinearLayout
android:id="@+id/trackingStautsInnerWrapper3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="@+id/textViewAltLabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Höhe: "
android:textAppearance="?android:attr/textAppearanceSmall"
android:textSize="10sp" />
<TextView
android:id="@+id/textViewAltWert"
android:layout_width="80dp"
android:layout_height="wrap_content"
android:text=""
android:textAppearance="?android:attr/textAppearanceSmall"
android:textSize="10sp" />
<TextView
android:id="@+id/textViewAccLabel"
android:layout_marginLeft="40dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Genauigkeit: "
android:textAppearance="?android:attr/textAppearanceSmall"
android:textSize="10sp" />
<TextView
android:id="@+id/textViewAccWert"
android:layout_width="80dp"
android:layout_height="wrap_content"
android:text=""
android:textAppearance="?android:attr/textAppearanceSmall"
android:textSize="10sp" />
</LinearLayout>
</LinearLayout>
<!--
<org.osmdroid.views.MapView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/mapview"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:clickable="true"/>
-->
<LinearLayout
android:id="@+id/trackingLinearLayoutMap"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
</LinearLayout>
希望它有所帮助!
答案 0 :(得分:4)
你永远不会相信这一点,但如果你转到How often can you update a textview without mess,你会发现我认为正在解决这个问题的问题和答案。
如果这些问题无法解决问题,您可能需要使用自定义视图替换该按钮,并使用canvas.drawText()
覆盖onDraw以将文本放置到位。然后,您可以确保擦除任何以前的历史...
如果您只想要一个非透明的黑色背景,请在res
目录中创建(或添加)colors.xml文件:
<resources>
<color name="black">#ff000000</color>
</resources>
并添加:
android:background="@color/black"
到TextView的xml。
答案 1 :(得分:-1)
中的行
android:text=""
<TextView
android:id="@+id/textViewLonWert"
android:layout_width="80dp"
android:layout_height="wrap_content"
android:text=""
android:textAppearance="?android:attr/textAppearanceSmall"
android:textSize="10sp" />
是多余的,您可以删除该行。