关于java：在谷歌地图活动中的特定位置显示消息？

Display message at a specific location in Google Maps Activity?

如何在 Android 上的 Google 地图活动中的特定位置显示消息而不添加标记？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？

您可以将任何 View 放置在 MapFragment(或 MapView)上，并使用动画为它制作动画：动画大小、位置、透明度等，使用各种插值器并通过。要获取特定 LatLng 坐标的 View 的屏幕位置，您可以使用 Projection.toScreenLocation() 方法。

例如，对于地图上带有"弹出"动画的"Hello World"TextView，您可以使用如下代码：

activity_main.xml:

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<?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:

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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：

Popup