[英]popup window over canvas Android
我正在構建一個顯示地圖的應用程序(地圖是畫布背景),並通過在畫布上添加圓圈(使用繪制圓圈)來本地化用戶。 我想在畫布上添加一個按鈕(現在在地圖上繪制一個按鈕,如果用戶點擊它就檢查ontouch()),當觸摸按鈕時,我想要一個窗口彈出窗口。 它工作但彈出窗口在畫布后面(我可以看到它的一小部分(我刪除它))。有沒有辦法讓我的畫布在按鈕和彈出窗口后面? 我看到人們談論將畫布放在相對布局中,但我不知道該怎么做。
這是我的活動的xml,非常簡單:
<?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>
這是我的活動java代碼(我刪除了一些與我的問題無關的事情)
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;
}
}
}
有人知道我該怎么做? 謝謝
<FrameLayout 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" >
<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" >
<RelativeLayout
android:id="@+id/btn_close"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:background="@drawable/back_transparent_pressed" >
<Button
android:id="@+id/button1"
android:layout_centerInParent="true"
/>
</RelativeLayout>
兩次調用setContentView
是行不通的。 相反,您應該將canvas view
和button
放在單個布局中,但需要正確排序。 相對布局中的最后一個窗口小部件具有更高的優先級,因此如果您希望按鈕位於畫布頂部,則您的布局應該是這樣的。
<?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" >
<com.example.client.MapView
android:id="@+id/mapView"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<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>
並在java類中訪問您的MapView
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.campus);
setSize();
this.mapv = findViewById(R.id.mapView); //!! my view
i= new Intent(this, myService.class);
this.startService(i);
}
顯然, alert dialog
將位於畫布的頂部。 希望能幫助到你!
編輯:我認為膨脹錯誤是由於不正確的類路徑造成的。 由於MapView
是Campus
內部類,路徑應該是這樣的
<com.example.client.Campus.MapView
android:id="@+id/mapView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
還要將此構造函數添加到MapView
類中
public MapView(Context context, AttributeSet attributeSet) {
super(context, attributeSet) ;
redPaint = new Paint();
redPaint.setAntiAlias(true);
redPaint.setColor(Color.RED);
redPaint.setTextSize(10);
}
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