CODEWITHSUNDEEP
javaandroid
Vlad Alexeev
Vlad Alexeev

Reputation: 2204

How do I address custom view class from Activity?

I made a custom view which I called Game.java

public class Game extends View {
    public Game(Context context, AttributeSet attrs) {
//here goes class
public void shot(){
}
//method I want to use sometime
}

here's part of my layout file for Activity game.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@+id/root"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"

    tools:context=".GameActivity" >

    <com.vladdrummer.textmaster.Game
        android:id="@+id/game"
        android:layout_width="wrap_content"
        android:windowSoftInputMode="adjustResize"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />
<View
        android:id="@+id/spareview"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true" />

etc.. So, in Activity I simply do

setContentView(R.layout.game);

and I got my custom View class called Game.java as the part of the screen

But how do I address it? if I do :

Game game;
game =(Game) findViewById(R.id.game);
game.shot();

it crashes.

of course , I can do :

 Game game=new Game(this)
 setContentView(game);

and have access to game so it won't crash, but I need other elements on screen as well

please tell me how to do it right

Upvotes: 0

Views: 53

Answers (1)

Raghunandan
Raghunandan

Reputation: 133560

You can have a RelativeLayout or LinearLayout in your xml and place it anywhere you want. You can have other views in xml also. This is one way

setContentView(R.layout.yourlayout); // infalte layout
RelativeLayout rl =(RelativeLayout) findViewById(R.id.relativeLayout);// initialize 
Game game=new Game(this);
rl.addView(game);  // ad view to container

But you have the custom view in your layout. You are missing constructors in GameView. Your method also should also work

Read Chapter 4 Creating user Interface by Retro Meier Professional Android Devleopment

Upvotes: 1

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