CODEWITHSUNDEEP
android
Alan Deep
Alan Deep

Reputation: 2105

Custom namespace for view in android xml

Here I made my own custom widgets in android and they all work fine. However, i have like 20 xml files and I don't want to change the EditText in xml to com.example.customwidget.MyEditText in all the xml layouts that I have. Any fast way to do that?

For example: The below xml won't work. It will crash the application because there is no MyEditText in the android sdk widgets, that's my own widget. 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <MyEditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:ems="10"
        android:inputType="number" >

        <requestFocus />
    </MyEditText>

</RelativeLayout>

However, This one will work: 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <com.example.customwidget.MyEditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:ems="10"
        android:inputType="number" >

        <requestFocus />
    </com.example.customwidget.MyEditText>

</RelativeLayout>

What I would like to do is to simply keep the EditText tag in the xml. However, I want to by my own custom EditText.

Ok I know I will have to change the class name first to be EditText instead of MyEditText but how can I let all the XML Layout files know that I want my custom EditText and not the native one?

Upvotes: 1

Views: 73

Answers (1)

StenSoft
StenSoft

Reputation: 9609

Implement custom LayoutInflater.Factory and set it to your activity's LayoutInflater

Here is an example of such factory:

public class MyLayoutInflaterFactory implements LayoutInflater.Factory
{
    public View onCreateView(String name, Context context, AttributeSet attrs)
    {
        if ("EditText".equals(name))
            return new MyEditText(context, attrs);
        return null;
    }
}

Then you need to use it in your activity:

public class MyActivity extends Activity
{
    ⋮

     LayoutInflater layoutInflater;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        layoutInflater = LayoutInflater
            .from(this)
            .cloneInContext(this)
            .setFactory(new MyLayoutInflaterFactory());

         setContentView(layoutInflater.inflate(R.layout.my_activity, null));
    }

    @Override
    public LayoutInflater getLayoutInflater()
    {
        return layoutInflater;
    }

    ⋮
}

Upvotes: 2

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