Creating custom view from xml

问题

I would like to add the same horizontal scrollable row of buttons like so

<HorizontalScrollView [...]>
  <LinearLayout [...] android:orientation="horizontal">
    <Button android:id="@+id/btn1" [..] />
    <Button [..] />
     [...] 
  </LinearLayout>
</HorizontalScrollView>

(toolbar.xml) to the bottom of every activity in my application. Rather than have to specify the click listeners for each button in every single activity, I'd like to be able to do all of that in one place and then just import the control each time. I figure I can do something like

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent">
 <com.example.ButtonBar android:layout_width="fill_parent"
    android:layout_height="wrap_content" android:layout_alignParentBottom="true"
    android:layout_below="@+id/pagecontent" />
 <LinearLayout android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:id="@+id/pagecontent">

    <!-- the rest of each activity's xml -->

 </LinearLayout>

to include the button bar on the screen, and then do something like

package com.example;

import android.content.Context;
import android.content.Intent;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.HorizontalScrollView;

public class ButtonBar extends HorizontalScrollView implements OnClickListener
{

  public ButtonBar(Context context, AttributeSet attrs)
  {
    super(context, attrs);
    LayoutInflater inflater = 
        (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View view = inflater.inflate(R.layout.toolbar, null);

    Button btn1 = (Button) view.findViewById(R.id.button1);
    btn1.setOnClickListener(this);

    // and so on for the rest of the buttons

    addView(View);
  }

  @Override
  public void onClick(View v)
  {
    Intent intent = null;

    if (v.getId() == R.id.btn1)
    {
      intent = new Intent(getContext(), FirstScreen.class);
    }
    else if  (v.getId() == R.id.btn2)
    {
      intent = new Intent(getContext(), SecondScreen.class);
    }
    // and so on

    if (intent != null) getContext().startActivity(intent);     
  }    
}

but then what? How do I actually get it to display? Are there other methods I should be overriding? Is there a better / more appropriate way of doing this?

回答1:

Take a look at a custom control ProgressView in my app BBC News, and one layout that uses it.

http://svn.jimblackler.net/jimblackler/trunk/workspace/NewsWidget/src/net/jimblackler/newswidget/ProgressView.java

http://svn.jimblackler.net/jimblackler/trunk/workspace/NewsWidget/res/layout/progress_view.xml

http://svn.jimblackler.net/jimblackler/trunk/workspace/NewsWidget/res/layout/main.xml

来源：https://stackoverflow.com/questions/5756642/creating-custom-view-from-xml

标签

android

layout

views

custom-view