How to use standard attribute android:text in my custom view?
AndroidAttributesCustom ControlsAndroid Problem Overview
I wrote a custom view that extends RelativeLayout
. My view has text, so I want to use the standard android:text
without the need to specify a <declare-styleable>
and without using a custom namespace xmlns:xxx
every time I use my custom view.
this is the xml where I use my custom view:
<my.app.StatusBar
android:id="@+id/statusBar"
android:text="this is the title"/>
How can I get the attribute value? I think I can get the android:text attribute with
TypedArray a = context.obtainStyledAttributes(attrs, ???);
but what is ???
in this case (without a styleable in attr.xml)?
Android Solutions
Solution 1 - Android
use this:
public YourView(Context context, AttributeSet attrs) {
super(context, attrs);
int[] set = {
android.R.attr.background, // idx 0
android.R.attr.text // idx 1
};
TypedArray a = context.obtainStyledAttributes(attrs, set);
Drawable d = a.getDrawable(0);
CharSequence t = a.getText(1);
Log.d(TAG, "attrs " + d + " " + t);
a.recycle();
}
i hope you got an idea
Solution 2 - Android
EDIT
Another way to do it (with specifying a declare-styleable but not having to declare a custom namespace) is as follows:
attrs.xml:
<declare-styleable name="MyCustomView">
<attr name="android:text" />
</declare-styleable>
MyCustomView.java:
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.MyCustomView);
CharSequence t = a.getText(R.styleable.MyCustomView_android_text);
a.recycle();
This seems to be the generic Android way of extracting standard attributes from custom views.
Within the Android API, they use an internal R.styleable class to extract the standard attributes and don't seem to offer other alternatives of using R.styleable to extract standard attributes.
Original Post
To ensure that you get all the attributes from the standard component, you should use the following:
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.TextView);
CharSequence t = a.getText(R.styleable.TextView_text);
int color = a.getColor(R.styleable.TextView_textColor, context.getResources().getColor(android.R.color.darker_gray)); // or other default color
a.recycle();
If you want attributes from another standard component just create another TypedArray.
See http://developer.android.com/reference/android/R.styleable.html for details of available TypedArrays for standard components.