如何在不添加标记的情况下在 Android 上的 Google map Activity 中的特定位置显示消息?我只想在特定坐标处显示一个包含消息的小弹出动画。
是否有任何 GitHub 库可以执行此特定任务?
最佳答案
您可以将任何View
放在MapFragment
(或MapView
)上,并根据需要使用Animations 对其进行动画处理。 :动画大小,位置,透明度等,使用各种interpolators并通过 AnimatorSet
将多个动画合二为一.要获取特定 LatLng
坐标的 View
屏幕位置,您可以使用 Projection.toScreenLocation()
方法。
例如,对于在 map 上带有“弹出”动画的“Hello World”TextView
,您可以使用这样的代码:
activity_main.xml
:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="activities.MainActivity">
<fragment class="com.google.android.gms.maps.SupportMapFragment"
android:id="@+id/map_fragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
<TextView
android:id="@+id/popup_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="24sp"
android:visibility="invisible"
android:text="Hello World!"/>
</RelativeLayout>
MainActivity.java
:
public class MainActivity extends AppCompatActivity implements OnMapReadyCallback {
private GoogleMap mGoogleMap;
private SupportMapFragment mMapSupportedFragment;
private TextView mPopUpTextView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mPopUpTextView = (TextView) findViewById(R.id.popup_view);
mMapSupportedFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map_fragment);
mMapSupportedFragment.getMapAsync(MainActivity.this);
}
@Override
public void onMapReady(GoogleMap googleMap) {
mGoogleMap = googleMap;
mGoogleMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
@Override
public void onMapClick(LatLng latLng) {
// get screen position for latLng
Projection projection = mGoogleMap.getProjection();
Point origin = projection.toScreenLocation(latLng);
// popup TextView
popUpView(origin, mPopUpTextView, 500);
}
});
}
public void popUpView(final Point origin, final View view, long duration){
view.setX(origin.x);
view.setY(origin.y);
view.setVisibility(View.VISIBLE);
ValueAnimator sizeAnimation = ValueAnimator.ofInt(0, view.getMeasuredHeight());
sizeAnimation.setInterpolator(new AccelerateDecelerateInterpolator());
sizeAnimation.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
int val = (Integer) valueAnimator.getAnimatedValue();
ViewGroup.LayoutParams layoutParams = view.getLayoutParams();
layoutParams.height = val;
view.setLayoutParams(layoutParams);
}
});
sizeAnimation.setDuration(duration);
ValueAnimator positionAnimation = ValueAnimator.ofInt(0, view.getMeasuredHeight());
positionAnimation.setInterpolator(new AccelerateDecelerateInterpolator());
positionAnimation.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
int val = (Integer) valueAnimator.getAnimatedValue();
view.setY(origin.y - val);
}
});
positionAnimation.setDuration(duration);
AnimatorSet popUpSet = new AnimatorSet();
popUpSet.play(sizeAnimation).with(positionAnimation);
popUpSet.start();
}
}
结果:
关于java - 在 Google map Activity 中的特定位置显示消息?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/47502372/