【发布时间】：2014-05-09 05:29:22
【问题描述】：
我正在构建一个应用程序，它显示地图（地图是画布背景）并通过在画布上添加圆圈（使用绘制圆圈）来本地化用户。我想在画布上添加一个按钮（现在在地图上绘制一个按钮，如果用户单击它，请使用 ontouch() 检查）并且当按钮被触摸时，我希望弹出一个窗口。它有效，但弹出窗口在画布后面（我可以看到一小部分（我删除了它））。有没有办法让我的画布在按钮和弹出窗口后面？我看到人们谈论将画布放在相对布局中，但我不知道该怎么做。
这是我活动的xml，非常简单：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:background="@drawable/umap2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:text="Button" />
</RelativeLayout>
这是我的活动 java 代码（我删除了一些与我的问题无关的东西）
package com.example.client;
import java.util.LinkedList;
//....
import java.util.Timer;
public class Campus extends Activity{
final Handler myHandler = new Handler();
MapView mapv;
final Activity self = this;
Float ratioX;
Float ratioY;
int width;
int height;
static boolean out=false;
Intent i;
//creating a linked list for each hall
static LinkedList<compMac> DMS = new LinkedList<compMac>();
static LinkedList<compMac> MCD = new LinkedList<compMac>();
//...
static LinkedList<compMac> SCI = new LinkedList<compMac>();
static LinkedList<compMac> STE = new LinkedList<compMac>();
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.campus);
setSize();
this.mapv = new MapView(this);//!! my view
setContentView(mapv);
i= new Intent(this, myService.class);
this.startService(i);
}
//*******************************View class!*******************************
public class MapView extends View {
/*
* Extract the connected users and location from the array. separate the
* array into an array for each building
* */
private Paint redPaint;
private float radius;
Canvas canvas;
public MapView(Context context) {
super(context) ;
redPaint = new Paint();
redPaint.setAntiAlias(true);
redPaint.setColor(Color.RED);
redPaint.setTextSize(10);
}
@Override
//drawing a point on every hall on the map where users are connected
public void onDraw (Canvas canvas) {
// draw your circle on the canvas
if(!out)
{
AlertDialog.Builder outOfCampus = new AlertDialog.Builder(self);
outOfCampus.setTitle("Sorry");
outOfCampus.setMessage("You are out of Campus");//(toDisplay);
outOfCampus.setCancelable(false);
outOfCampus.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
startActivity(new Intent("com.example.client.Sin"));
}});
AlertDialog alertdialog = outOfCampus.create();
outOfCampus.show();
}
this.canvas=canvas;
setBackgroundResource(R.drawable.umap2);
}
public void drawPoints(LinkedList<compMac> building)
{
if(!building.isEmpty())
{
while(!building.isEmpty())
{
compMac current = building.pop();
Float x= ratioX*(Float.parseFloat(current.getCoorX()));
Float y= ratioY*(Float.parseFloat(current.getCoorY()));
// Log.w("ratioX ",(((Double)(width/768)).toString()));
// Log.w("ratioY ",(float)(y.toString()));
canvas.drawCircle (x,y, 10, redPaint);
}
}
}
public boolean onTouchEvent (MotionEvent event) {
//...//
return true;
}
}
}
有人知道我该怎么做吗？谢谢
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