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是一个用于存放恢复obtainStyledAttributes(AttributeSet, int[], int, int)或 obtainAttributes(AttributeSet, int[])
值的一个数组容器,当操作完成以后,一定要调用recycle()方法。用于检索的索引值在这个结构对应的位置给obtainStyledAttributes属性。
使用这个类的时候,先要在valuse文件夹下创建:atts.xml文件:
- <?xml version="1.0" encoding="utf-8"?>
- <resources>
- <declare-styleable name="FlowIndicator">
- <attr name="count" format="integer" />
- <attr name="space" format="dimension" />
- <attr name="point_size" format="dimension" />
- <attr name="point_seleted_color" format="color|reference" />
- <attr name="point_normal_color" format="color|reference" />
- <attr name="point_radius" format="dimension" />
- </declare-styleable>
- </resources>
首先,声明自定义<declare-styleable name="FlowIndicator">,nameFlowIndicator,属性设置为比较简单的格式,前面参数name,后面是参数格式。
自定义属性的format,可以有以下多种:
- reference
- string
- color
- dimension
- boolean
- integer
- float
- fraction
- enum
- flag
然后这样使用:
- public FlowIndicator(Context context, AttributeSet attrs) {
- super(context, attrs);
-
- TypedArray typeArray = context.obtainStyledAttributes(attrs,
- R.styleable.FlowIndicator);
-
- count = typeArray.getInteger(R.styleable.FlowIndicator_count, 4);
- space = typeArray.getDimension(R.styleable.FlowIndicator_space, 9);
- radius = typeArray.getDimension(R.styleable.FlowIndicator_point_radius, 9);
-
- point_normal_color = typeArray.getColor(
- R.styleable.FlowIndicator_point_normal_color, 0x000000);
- point_seleted_color = typeArray.getColor(
- R.styleable.FlowIndicator_point_seleted_color, 0xffff07);
-
- int sum = attrs.getAttributeCount();
- if (Constans.DEBUG) {
- String str = "";
- for (int i = 0; i < sum; i++) {
- String name = attrs.getAttributeName(i);
- String value = attrs.getAttributeValue(i);
- str += "attr_name :" + name + ": " + value + "\n";
- }
- Log.i("attribute", str);
- }
- typeArray.recycle();
- }
最后一定不要忘记typeArray.recycle():
- Give back a previously retrieved StyledAttributes, for later re-use.
给回以前提取的styledattributes,以后再使用。
应该注意到,获取属性的时候所用的R.styleable.FlowIndicator_count中的FlowIndicator_count是采取的名字_属性这种格式。
定义好了自定义属性,就可以在自定控件中的属性设置了:
- <?xml version="1.0" encoding="utf-8"?>
- <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
- xmlns:app="http://schemas.android.com/apk/res/com.dream.myqiyi"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- android:orientation="vertical" >
- <com.dream.myqiyi.widget.FlowIndicator
- android:id="@+id/myView"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:layout_marginBottom="5dip"
- app:count="4"
- android:gravity="center"
- app:point_normal_color="#45000000"
- app:point_radius="3dip"
- app:point_seleted_color="#ffffff"
- app:point_size="5dip"
- app:space="10dip" />
- </FrameLayout>
首先,要有声明:
xmlns:app="http://schemas.android.com/apk/res/com.dream.myqiyi",“com.dream.myqiyi”这个是你项目的包名。
然后我们就可以使用app:这样设置自定义的属性了。
- app:point_normal_color="#45000000"
- app:point_radius="3dip"
- app:point_seleted_color="#ffffff"
- app:point_size="5dip"
- app:space="10dip"
android自定义视图属性(atts.xml,TypedArray)学习
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原文地址:http://www.cnblogs.com/lianghe01/p/4241178.html