GIS的学习（二十二）osmdroid中添加縮放控件

package com.geoserver.osmdroid;

import org.osmdroid.tileprovider.util.CloudmadeUtil;
import org.osmdroid.views.MapView;
import org.osmdroid.views.overlay.MinimapOverlay;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.RelativeLayout.LayoutParams;

/**
 * osmdroid中添加縮放控件 
 *   1.注意佈局設置
 *   2.添加相關的事件
 * 
 * @Title: 
 * @Description: 实现TODO
 * @Copyright:Copyright (c) 2011
 * @Company:
 * @Date:2012-9-6
 * @author  longgangbai
 * @version 1.0
 */
public class SampleWithMinimapZoomcontrols extends Activity {

	private MapView mOsmv;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(final Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		final RelativeLayout rl = new RelativeLayout(this);
		CloudmadeUtil.retrieveCloudmadeKey(getApplicationContext());
		this.mOsmv = new MapView(this, 256);
		rl.addView(this.mOsmv, new RelativeLayout.LayoutParams(LayoutParams.FILL_PARENT,
				LayoutParams.FILL_PARENT));

		//縮放控件的使用
		/* ZoomControls */
		{
			/* Create a ImageView with a zoomIn-Icon. */
			final ImageView ivZoomIn = new ImageView(this);
			ivZoomIn.setImageResource(R.drawable.zoom_in);
			/* Create RelativeLayoutParams, that position in in the top right corner. */
			final RelativeLayout.LayoutParams zoominParams = new RelativeLayout.LayoutParams(
					RelativeLayout.LayoutParams.WRAP_CONTENT,
					RelativeLayout.LayoutParams.WRAP_CONTENT);
			zoominParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
			zoominParams.addRule(RelativeLayout.ALIGN_PARENT_TOP);
			rl.addView(ivZoomIn, zoominParams);

			ivZoomIn.setOnClickListener(new OnClickListener() {
				@Override
				public void onClick(final View v) {
					SampleWithMinimapZoomcontrols.this.mOsmv.getController().zoomIn();
				}
			});

			/* Create a ImageView with a zoomOut-Icon. */
			final ImageView ivZoomOut = new ImageView(this);
			ivZoomOut.setImageResource(R.drawable.zoom_out);

			/* Create RelativeLayoutParams, that position in in the top left corner. */
			final RelativeLayout.LayoutParams zoomoutParams = new RelativeLayout.LayoutParams(
					RelativeLayout.LayoutParams.WRAP_CONTENT,
					RelativeLayout.LayoutParams.WRAP_CONTENT);
			zoomoutParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
			zoomoutParams.addRule(RelativeLayout.ALIGN_PARENT_TOP);
			rl.addView(ivZoomOut, zoomoutParams);

			ivZoomOut.setOnClickListener(new OnClickListener() {
				@Override
				public void onClick(final View v) {
					SampleWithMinimapZoomcontrols.this.mOsmv.getController().zoomOut();
				}
			});
		}

		/* MiniMap */
		{
			MinimapOverlay miniMapOverlay = new MinimapOverlay(this,
					mOsmv.getTileRequestCompleteHandler());
			this.mOsmv.getOverlays().add(miniMapOverlay);
		}

		this.setContentView(rl);
	}
}