Use of Custom Attributes in andriod and Custom Attributes in andriod

Use of Custom Attributes in andriod and Custom Attributes in andriod

Custom property file values/attrs. xml:

<?xml version="1.0" encoding="utf-8"?><resources>     <declare-styleable name="RangeSeekBar">              <attr name="orientation" format="string"/>         <attr name="limitThumbRange" format="boolean"/>                           <attr name="scaleMin" format="float"/>        <attr name="scaleMax" format="float"/>        <attr name="scaleStep" format="float"/>                <attr name="thumb" format="reference"/>        <attr name="thumbs" format="integer"/>        <attr name="thumbWidth" format="dimension"/>        <attr name="thumbHeight" format="dimension"/>                <attr name="track" format="reference"/>                <attr name="range" format="reference"/>    </declare-styleable></resources>

Attr in the custom property file is a number of custom properties that can be used in the control properties in the layout file.

The attribute formats include the following:

1. reference: refer to a resource ID.

2. color: color value.

3. boolean: boolean value.

4. dimension: dimension value.

5. float: floating point value.

6. integer: integer value.

7. string: string.

8. fraction: percentage.

9. enum: enumeration value.

10. flag: bitwise OR operation.

Reference custom attributes in the layout file:

1. Define a reference prefix for an attribute: xmlns: RangeSeekBar = "http://schemas.android.com/apk/res/diy.example.location ",

Diy. example. location is the package name. In the following control, you can use the prefix RangeSeekBar. In the control, you can use the prefix to reference attributes.

2. Reference properties in the control:

RangeSeekBar:thumb="@drawable/thumb" 

RangeSeekBar:thumbs="2"

Thumb is a reference type. It references a resource thumb of drawable, that is, a resource file named thumb exists in the drawable directory.

Thumbs is an integer type and is initialized to 2. The following is an example of the layout file:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:RangeSeekBar="http://schemas.android.com/apk/res/diy.example.location"     xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"       tools:context=".ViewLocPathActivity" >       <diy.example.location.RangeSeekBar        android:id="@+id/seekPath"        android:layout_width="match_parent"        android:layout_height="30dp"        android:layout_alignParentBottom="true"        android:layout_marginBottom="50dp"        android:layout_marginLeft="10dp"        android:layout_marginRight="10dp"        RangeSeekBar:thumb="@drawable/thumb"         RangeSeekBar:track="@drawable/trackgradient"         RangeSeekBar:range="@drawable/rangegradient"         RangeSeekBar:thumbs="2"  />    </RelativeLayout>

Reference to custom attributes in java code:

GetFloat is used for floating point numbers, and getDrawable is used for reference. Each attribute name will generate an integer under R. styleable for reference in java code:

scaleRangeMin = a.getFloat(R.styleable.RangeSeekBar_scaleMin, 0);

Thumb = a. getDrawable (R. styleable. RangeSeekBar_thumb); below is the sample code for using custom attributes in a custom control:

    public RangeSeekBar(Context context, AttributeSet attrs) {        super(context, attrs);        init(context);        // Obtain our styled custom attributes from xml        TypedArray a = context.obtainStyledAttributes(attrs,R.styleable.RangeSeekBar);                        String s = a.getString(R.styleable.RangeSeekBar_orientation);        if(s != null)            orientation = s.toLowerCase().contains("vertical") ? VERTICAL : HORIZONTAL;                limitThumbRange = a.getBoolean(R.styleable.RangeSeekBar_limitThumbRange, true);                scaleRangeMin = a.getFloat(R.styleable.RangeSeekBar_scaleMin, 0);        scaleRangeMax = a.getFloat(R.styleable.RangeSeekBar_scaleMax, 100);        scaleStep = Math.abs(a.getFloat(R.styleable.RangeSeekBar_scaleStep, DEFAULT_STEP));                thumb = a.getDrawable(R.styleable.RangeSeekBar_thumb);                range = a.getDrawable(R.styleable.RangeSeekBar_range);                track = a.getDrawable(R.styleable.RangeSeekBar_track);                // Register desired amount of thumbs        int noThumbs = a.getInt(R.styleable.RangeSeekBar_thumbs, DEFAULT_THUMBS);        thumbWidth = a.getDimension(R.styleable.RangeSeekBar_thumbWidth, 50);        thumbHeight = a.getDimension(R.styleable.RangeSeekBar_thumbHeight, 100);        for(int i = 0; i < noThumbs; i++) {            Thumb th = new Thumb();            thumbs.add(th);        }        a.recycle();    }

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