Hi,
I wanted to create my own custom layout.
While testing it, i found out that the custom attributes that i implemented
in my layout don't get passed to the childs of my layout correctly and
always are equal to my specified default values.
I couldn't find any suitable things on the internet about this and I'm
really new to android development, so forgive me if it's some really dumb
thing I did wrong.
This is the xml code of my main activity:
<?xml version="1.0" encoding="utf-8"?>
<com.myCompany.myProjectName.TestLayout
xmlns:android="http://schemas.android.com/apk/res/android";
xmlns:custom="http://schemas.adroid.com/apk/res/com.myCompany.myProjectName";
xmlns:tools="http://schemas.android.com/tools";
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".Main" >
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
custom:test="1"
android:text=""
android:background="#FFF" />
</com.myCompany.myProjectName.TestLayout>
I defined the layout attributes in res/values/attrs.xml:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="TestLayout" />
<declare-styleable name="TestLayout_LayoutParams">
<attr name="test" format="integer" />
</declare-styleable>
</resources>
and the code for the layout itself:
public class TestLayout extends ViewGroup
{
public TestLayout(Context context)
{
super(context);
}
public TestLayout(Context context, AttributeSet attrs)
{
super(context, attrs);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b)
{
for (int i = 0; i < getChildCount(); i++)
{
getChildAt(i).layout(0, 0, 400, 200);
}
}
@Override
protected boolean checkLayoutParams(ViewGroup.LayoutParams p)
{
return p instanceof LayoutParams;
}
@Override
protected LayoutParams generateDefaultLayoutParams()
{
return new LayoutParams(0, 0);
}
@Override
public LayoutParams generateLayoutParams(AttributeSet attrs)
{
return new LayoutParams(getContext(), attrs);
}
@Override
protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p)
{
return new LayoutParams(p.width, p.height);
}
public static class LayoutParams extends ViewGroup.LayoutParams
{
public int test;
public LayoutParams(int width, int height)
{
super(width, height);
}
public LayoutParams(Context context, AttributeSet attrs)
{
super(context, attrs);
TypedArray a = context.obtainStyledAttributes(attrs,
R.styleable.RelativeLayoutEx_LayoutParams);
try
{
this.test =
a.getInt(R.styleable.TestLayout_LayoutParams_test, 0);
}
finally
{
a.recycle();
}
}
}
}
In fact, I'm not doing much in these lines and since it's only for testing,
the onLayout function gives every child the same values for position and
size.
The only thing my app does in the moment is printing the "test" attribute
of the TextView if i click on it:
public class Main extends Activity
{
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
TextView tv = (TextView)findViewById(R.id.textView);
tv.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
TextView tv = (TextView)v;
TestLayout.LayoutParams lp =
(TestLayout.LayoutParams)v.getLayoutParams();
tv.setText("test: " + lp.test);
}
});
}
}
Well, and it always prints "test: 0", no matter what value i give it in the
main.xml.
..has anyone around here a clue what this could be all about?
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