Creating Compound Controls With Custom XML Attributes
I'm been trying to combine a TextView and an EditText into one compound control which uses custom xml elements to pass in default values for each individual element. I've been looking at the tutorials/docs here:
Building Compound Controls Passing Custom AttributesWhat I have so far.
Attrs.xml:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="FreeText">
<attr name="label" format="string" />
<attr name="default" format="string" />
</declare-styleable>
</resources>
My Main Layout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:myapp="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<com.example.misc.FreeText
android:layout_width="fill_parent"
开发者_如何学Go android:layout_height="wrap_content"
myapp:label="label"
myapp:default="default"
/>
</LinearLayout>
My Compound Control, FreeText:
public class FreeText extends LinearLayout {
TextView label;
EditText value;
public FreeText(Context context, AttributeSet attrs) {
super(context, attrs);
this.setOrientation(HORIZONTAL);
LayoutParams lp = new LayoutParams(0, LayoutParams.WRAP_CONTENT);
lp.weight = 1;
label = new TextView(context);
addView(label, lp);
value = new EditText(context);
addView(value, lp);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.FreeText);
CharSequence s = a.getString(R.styleable.FreeText_label);
if (s != null) {
label.setText(s);
}
a.recycle();
}
}
When I run the program I see the views OK but the value of my CharSequence, s, is always null. Can someone tell me where I'm going wrong?
I hate it when you notice the problem right after you ask for help.
The problem was that my namespace for my custom XML elements should have been like so:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:myapp="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<com.example.misc.FreeText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
myapp:label="label"
myapp:default="default"
/>
</LinearLayout>
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