我的简单应用程序有谷歌地图与叠加。还有一个onDraw()方法可以在我的位置放置一个图标。当我单击后退按钮时,应用程序不会关闭或转到活动前:(这是我在活动中使用的方法。
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_I) {
gMapView.getController().setZoom(gMapView.getZoomLevel() + 1);
return true;
} else if (keyCode == KeyEvent.KEYCODE_O) {
gMapView.getController().setZoom(gMapView.getZoomLevel() - 1);
return true;
} else if (keyCode == KeyEvent.KEYCODE_S) {
gMapView.setSatellite(true);
return true;
} else if (keyCode == KeyEvent.KEYCODE_T) {
gMapView.setTraffic(true);
return true;
}
return false;
}
/* Class overload draw method which actually plot a marker,text etc. on Map */
protected class MyLocationOverlay extends com.google.android.maps.Overlay {
@Override
public boolean draw(Canvas canvas, MapView mapView, boolean shadow, long when) {
Paint paint = new Paint();
super.draw(canvas, mapView, shadow);
// Converts lat/lng-Point to OUR coordinates on the screen.
Point myScreenCoords = new Point();
mapView.getProjection().toPixels(p, myScreenCoords);
paint.setStrokeWidth(1);
paint.setARGB(255, 255, 255, 255);
paint.setStyle(Paint.Style.STROKE);
Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.passenger);
canvas.drawBitmap(bmp, myScreenCoords.x, myScreenCoords.y, paint);
canvas.drawText("I am here...", myScreenCoords.x, myScreenCoords.y, paint);
return true;
}
答案 0 :(得分:1)
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_I) {
gMapView.getController().setZoom(gMapView.getZoomLevel() + 1);
return true;
} else if (keyCode == KeyEvent.KEYCODE_O) {
gMapView.getController().setZoom(gMapView.getZoomLevel() - 1);
return true;
} else if (keyCode == KeyEvent.KEYCODE_S) {
gMapView.setSatellite(true);
return true;
} else if (keyCode == KeyEvent.KEYCODE_T) {
gMapView.setTraffic(true);
return true;
}
return super.onKeyDown(keyCode, event);
}
试试这个
答案 1 :(得分:1)
您应该删除方法末尾的return true;
,而是在其中添加else
语句,其中包含return super.onKeyDown(keyCode, event);
。
答案 2 :(得分:0)
在onKeyDown方法的else部分添加以下代码。
return super.onKeyDown(keyCode, event);