java 双击：放大 Android MapView？
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Double tap: zoom on Android MapView?
提问by poeschlorn
After a little bit of work my route application works fine. The only thing I just want to add is a double tap zoom in function, but I don't know how.
经过一些工作，我的路线应用程序工作正常。我唯一想添加的是双击放大功能，但我不知道如何。
Could you give me a hint?
你能给我一个提示吗？
采纳答案by reflog
Implement GestureListener to receive doubleTap events.
实现 GestureListener 以接收 doubleTap 事件。
see: Fling gesture detection on grid layout
请参阅：网格布局上的甩动手势检测
回答by azizbekian
I've also been searching for an answer/example, but found nowhere working code.
我也一直在寻找答案/示例，但找不到工作代码。
Finally, here's the code that's working for me:
最后，这是对我有用的代码：
MyMapActivity.java
我的地图活动.java
public class MyMapActivity extends MapActivity
implements OnGestureListener, OnDoubleTapListener {
private MapView mapView;
@Override
public void onCreate(Bundle savedInstanceState) {
requestWindowFeature(Window.FEATURE_NO_TITLE);
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mapView = (MapView)findViewById(R.id.mapView);
}
@Override
public boolean onDoubleTap(MotionEvent e) {
int x = (int)e.getX(), y = (int)e.getY();;
Projection p = mapView.getProjection();
mapView.getController().animateTo(p.fromPixels(x, y));
mapView.getController().zoomIn();
return true;
}
// Here will be some autogenerated methods too
OnDoubleTap.java
OnDoubleTap.java
public class OnDoubleTap extends MapView {
private long lastTouchTime = -1;
public OnDoubleTap(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (ev.getAction() == MotionEvent.ACTION_DOWN) {
long thisTime = System.currentTimeMillis();
if (thisTime - lastTouchTime < ViewConfiguration.getDoubleTapTimeout()) {
// Double tap
this.getController().zoomInFixing((int) ev.getX(), (int) ev.getY());
lastTouchTime = -1;
} else {
// Too slow
lastTouchTime = thisTime;
}
}
return super.onInterceptTouchEvent(ev);
}
}
main.xml
主文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<azizbekyan.andranik.map.OnDoubleTap
android:id="@+id/mapView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:enabled="true"
android:clickable="true"
android:apiKey="YOUR_API_KEY" />
</LinearLayout>
Don't forget to replace here the android:apiKeyvalue with your apiKey.
不要忘记在此处android:apiKey用您的apiKey.
回答by Bachi
Here is a nice and down-to-the-point implementation:
这是一个很好的、切中要害的实现：
Double Tap Zoom in GoogleMaps Activity
(a late answer for all those that stuble over this question)
（所有那些在这个问题上绊倒的人的迟到答案）
回答by Igor Deruga
An old post, I know, but this solution works too: double click/tap map zoom (Android)
我知道一个旧帖子，但这个解决方案也有效：双击/点击地图缩放（Android）
I think he fixed his errors in his own post, so just use the question part, not the answers (they are horrible :))
我认为他在他自己的帖子中修正了他的错误，所以只使用问题部分，而不是答案（它们很糟糕:)）
回答by Sudhir
Use the following code when you want to zoom in and zoom out
要放大和缩小时使用以下代码
- zoom in double click on top 50% of mapview
- Zoom out double click on bottom 50% of mapview
- 放大双击地图视图的前 50%
- 缩小双击地图视图底部 50%
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (ev.getAction() == MotionEvent.ACTION_DOWN) {
long thisTime = System.currentTimeMillis();
DisplayMetrics metrics = new DisplayMetrics();
WindowManager wm = (WindowManager) activity.getSystemService(activity.getApplicationContext().WINDOW_SERVICE);
wm.getDefaultDisplay().getMetrics(metrics);
int height = metrics.heightPixels;
if (thisTime - lastTouchTime < ViewConfiguration.getDoubleTapTimeout()) {
// Double tap
if((height/2)>ev.getY()){
// Zoom IN
this.getController().zoomInFixing((int) ev.getX(), (int) ev.getY());
}else{
this.getController().zoomOutFixing((int) ev.getX(), (int) ev.getY());
//Zoom Out
}
lastTouchTime = -1;
} else {
// Too slow
lastTouchTime = thisTime;
}
}
return super.onInterceptTouchEvent(ev);
}
回答by mattyU
In case somebody is looking for the answer for the new GoogleMap (Since Google-Play-service:9+)
如果有人正在寻找新 GoogleMap 的答案（自 Google-Play-service:9+）
case MotionEvent.ACTION_DOWN:
x1 = m.getX();
if ((System.currentTimeMillis() - systemTime) < 200) {
mGoogleMap.animateCamera(CameraUpdateFactory.zoomIn());
}
systemTime = System.currentTimeMillis();
break;
case MotionEvent.ACTION_UP:
systemTime = System.currentTimeMillis();
...
break;
