platform/android/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxsdk/testapp/activity/annotation/MarkerViewScaleActivity.java


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package com.mapbox.mapboxsdk.testapp.activity.annotation;

import android.os.Bundle;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.MenuItem;
import android.view.View;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;

import com.mapbox.mapboxsdk.annotations.Icon;
import com.mapbox.mapboxsdk.annotations.IconFactory;
import com.mapbox.mapboxsdk.annotations.MarkerView;
import com.mapbox.mapboxsdk.annotations.MarkerViewManager;
import com.mapbox.mapboxsdk.annotations.MarkerViewOptions;
import com.mapbox.mapboxsdk.geometry.LatLng;
import com.mapbox.mapboxsdk.maps.MapView;
import com.mapbox.mapboxsdk.maps.MapboxMap;
import com.mapbox.mapboxsdk.maps.OnMapReadyCallback;
import com.mapbox.mapboxsdk.testapp.R;

import java.util.Locale;

public class MarkerViewScaleActivity extends AppCompatActivity implements OnMapReadyCallback {

  private MapboxMap mapboxMap;
  private MapView mapView;

  private MarkerView markerView;
  private MarkerViewManager markerViewManager;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_marker_view_scale);

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    final ActionBar actionBar = getSupportActionBar();
    if (actionBar != null) {
      actionBar.setDisplayHomeAsUpEnabled(true);
      actionBar.setDisplayShowHomeEnabled(true);
    }

    mapView = (MapView) findViewById(R.id.mapView);
    mapView.onCreate(savedInstanceState);
    mapView.getMapAsync(this);
  }

  @Override
  public void onMapReady(MapboxMap map) {
    mapboxMap = map;
    markerViewManager = map.getMarkerViewManager();

    final SeekBar xBar = (SeekBar) findViewById(R.id.seekbar_factor);
    final TextView textView = (TextView) findViewById(R.id.textview_factor);

    // We need to listen to a render event to be sure
    // the View of the Marker has been added to the map
    mapView.addOnMapChangedListener(new MapView.OnMapChangedListener() {
      @Override
      public void onMapChanged(@MapView.MapChange int change) {
        if (isMarkerRendered()) {
          Toast.makeText(MarkerViewScaleActivity.this, "MarkerView is ready", Toast.LENGTH_SHORT).show();
          View view = markerViewManager.getView(markerView);
          xBar.setOnSeekBarChangeListener(new FactorChangeListener(view, textView));
          xBar.setClickable(true);
          mapView.removeOnMapChangedListener(this);
        }
      }

      private boolean isMarkerRendered() {
        return markerView != null && markerViewManager.getView(markerView) != null;
      }
    });

    Icon icon = IconFactory.getInstance(MarkerViewScaleActivity.this)
      .fromResource(R.drawable.ic_circle);

    markerView = mapboxMap.addMarker(new MarkerViewOptions()
      .position(new LatLng(38.907192, -77.036871))
      .icon(icon)
      .flat(true));
  }


  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
      case android.R.id.home:
        onBackPressed();
        return true;
      default:
        return super.onOptionsItemSelected(item);
    }
  }

  @Override
  public void onResume() {
    super.onResume();
    mapView.onResume();
  }

  @Override
  public void onStart() {
    super.onResume();
    mapView.onStart();
  }

  @Override
  public void onStop() {
    super.onStop();
    mapView.onStop();
  }

  @Override
  public void onPause() {
    super.onPause();
    mapView.onPause();
  }

  @Override
  protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    mapView.onSaveInstanceState(outState);
  }

  @Override
  protected void onDestroy() {
    super.onDestroy();
    mapView.onDestroy();
  }

  @Override
  public void onLowMemory() {
    super.onLowMemory();
    mapView.onLowMemory();
  }

  private static class FactorChangeListener implements SeekBar.OnSeekBarChangeListener {

    private TextView textView;
    private View view;

    FactorChangeListener(View view, TextView textView) {
      this.view = view;
      this.textView = textView;
    }

    @Override
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
      float newScale = getScale(progress);
      textView.setText(String.format(Locale.US, "Scale: %.1f", newScale));
      if (view != null) {
        view.setScaleX(newScale);
        view.setScaleY(newScale);
      }
    }

    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {
      // Not used
    }

    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {
      // Not used
    }

    private float getScale(int progress) {
      float scale = 1.0f * progress / 25;
      return scale < 1.0 ? 1.0f : scale;
    }
  }

}