Text anchor position
A newer version of the Maps SDK is available
This page uses v9.7.1 of the Mapbox Maps SDK. A newer version of the SDK is available. Learn about the latest version, v11.3.1, in the Maps SDK documentation.
Note
This example is a part of the Mapbox Android Demo app. You can find the values for all referenced resources in the res directory. For example, see res/values/activity_strings.xml for R.string.* references used in this example.
activity_dds_style_rotating_text_anchor
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:mapbox="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.mapbox.mapboxsdk.maps.MapView
android:id="@id/mapView"
android:layout_width="match_parent"
android:layout_height="match_parent"
mapbox:mapbox_cameraTargetLat="32.562100"
mapbox:mapbox_cameraTargetLng="-101.264445"
mapbox:mapbox_cameraZoom="3.4"
mapbox:mapbox_cameraZoomMax="5.38"
mapbox:mapbox_cameraZoomMin="3.4" />
<androidx.cardview.widget.CardView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="top|center"
android:layout_marginTop="24dp">
<TextView
android:id="@+id/anchor_position_textview"
android:layout_width="wrap_content"
android:textColor="@color/black_semi_transparent"
android:layout_height="wrap_content"
android:padding="8dp" />
</androidx.cardview.widget.CardView>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/switch_anchor_position_fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:layout_marginBottom="16dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:srcCompat="@drawable/ic_cycle_through"
mapbox:fabSize="normal" />
</FrameLayout>
RotatingTextAnchorPositionActivity.java
package com.mapbox.mapboxandroiddemo.examples.styles;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.view.View;
import android.widget.TextView;
import com.mapbox.mapboxandroiddemo.R;
import com.mapbox.mapboxsdk.Mapbox;
import com.mapbox.mapboxsdk.maps.MapView;
import com.mapbox.mapboxsdk.maps.MapboxMap;
import com.mapbox.mapboxsdk.maps.OnMapReadyCallback;
import com.mapbox.mapboxsdk.maps.Style;
import com.mapbox.mapboxsdk.style.layers.Layer;
import static com.mapbox.mapboxsdk.style.layers.Property.TEXT_ANCHOR_BOTTOM;
import static com.mapbox.mapboxsdk.style.layers.Property.TEXT_ANCHOR_BOTTOM_LEFT;
import static com.mapbox.mapboxsdk.style.layers.Property.TEXT_ANCHOR_BOTTOM_RIGHT;
import static com.mapbox.mapboxsdk.style.layers.Property.TEXT_ANCHOR_CENTER;
import static com.mapbox.mapboxsdk.style.layers.Property.TEXT_ANCHOR_LEFT;
import static com.mapbox.mapboxsdk.style.layers.Property.TEXT_ANCHOR_RIGHT;
import static com.mapbox.mapboxsdk.style.layers.Property.TEXT_ANCHOR_TOP;
import static com.mapbox.mapboxsdk.style.layers.Property.TEXT_ANCHOR_TOP_LEFT;
import static com.mapbox.mapboxsdk.style.layers.Property.TEXT_ANCHOR_TOP_RIGHT;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.textAllowOverlap;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.textAnchor;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.textIgnorePlacement;
/**
* Use runtime-styling to adjust the state label SymbolLayer's textField anchor position.
*/
public class RotatingTextAnchorPositionActivity extends AppCompatActivity {
private MapView mapView;
private Layer stateLabelSymbolLayer;
private int index = 0;
private TextView anchorPositionTextView;
private static final String[] anchorOptions = new String[] {
TEXT_ANCHOR_CENTER, // The center of the text is placed closest to the anchor.
TEXT_ANCHOR_LEFT, // The left side of the text is placed closest to the anchor.
TEXT_ANCHOR_RIGHT, // The right side of the text is placed closest to the anchor.
TEXT_ANCHOR_TOP, // The top of the text is placed closest to the anchor.
TEXT_ANCHOR_BOTTOM, // The bottom of the text is placed closest to the anchor.
TEXT_ANCHOR_TOP_LEFT, // The top left corner of the text is placed closest to the anchor.
TEXT_ANCHOR_TOP_RIGHT, // The top right corner of the text is placed closest to the anchor.
TEXT_ANCHOR_BOTTOM_LEFT, // The bottom left corner of the text is placed closest to the anchor.
TEXT_ANCHOR_BOTTOM_RIGHT, // The bottom right corner of the text is placed closest to the anchor.
};
private static final String[] anchorDescriptions = new String[] {
"The center of the text is placed closest to the anchor.",
"The left side of the text is placed closest to the anchor.",
"The right side of the text is placed closest to the anchor.",
"The top of the text is placed closest to the anchor.",
"The bottom of the text is placed closest to the anchor.",
"The top left corner of the text is placed closest to the anchor.",
"The top right corner of the text is placed closest to the anchor.",
"The bottom left corner of the text is placed closest to the anchor.",
"The bottom right corner of the text is placed closest to the anchor."
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Mapbox access token is configured here. This needs to be called either in your application
// object or in the same activity which contains the mapview.
Mapbox.getInstance(this, getString(R.string.access_token));
// This contains the MapView in XML and needs to be called after the access token is configured.
setContentView(R.layout.activity_dds_style_rotating_text_anchor);
mapView = findViewById(R.id.mapView);
mapView.onCreate(savedInstanceState);
mapView.getMapAsync(new OnMapReadyCallback() {
@Override
public void onMapReady(@NonNull final MapboxMap mapboxMap) {
mapboxMap.setStyle(Style.MAPBOX_STREETS, new Style.OnStyleLoaded() {
@Override
public void onStyleLoaded(@NonNull Style style) {
stateLabelSymbolLayer = style.getLayer("state-label");
if (stateLabelSymbolLayer != null) {
// Use runtime-styling to ignore collision and allow overlap, so that adjusted text in this example,
// is more easily visible.
stateLabelSymbolLayer.setProperties(
textIgnorePlacement(true),
textAllowOverlap(true)
);
anchorPositionTextView = findViewById(R.id.anchor_position_textview);
setTextView(anchorOptions[index], anchorDescriptions[index]);
findViewById(R.id.switch_anchor_position_fab).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
index++;
if (index == anchorOptions.length - 1) {
index = 0;
}
// Use runtime styling to adjust the SymbolLayer's textAnchor position
stateLabelSymbolLayer.setProperties(textAnchor(anchorOptions[index]));
setTextView(anchorOptions[index], anchorDescriptions[index]);
}
});
}
}
});
}
});
}
private void setTextView(String anchorOption, String anchorDescription) {
anchorPositionTextView.setText(String.format(getString(R.string.position_textview),
anchorOption, anchorDescription));
}
// Add the mapView lifecycle to the activity's lifecycle methods
@Override
public void onResume() {
super.onResume();
mapView.onResume();
}
@Override
protected void onStart() {
super.onStart();
mapView.onStart();
}
@Override
protected void onStop() {
super.onStop();
mapView.onStop();
}
@Override
public void onPause() {
super.onPause();
mapView.onPause();
}
@Override
public void onLowMemory() {
super.onLowMemory();
mapView.onLowMemory();
}
@Override
protected void onDestroy() {
super.onDestroy();
mapView.onDestroy();
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
mapView.onSaveInstanceState(outState);
}
}