android-我的自定义视图的默认属性值(从LinearLayout继承)
作者:互联网
我有一个自定义布局
public class PersonView extends LinearLayout{
public PersonView(Context context, AttributeSet attrs) {
super(context, attrs);
initUi(context);
}
public PersonView(Context context) {
super(context);
initUi(context);
}
private void initUi(Context context){
LayoutInflater.from(context).inflate(R.layout.person_view, this, true);
profilePicture = (ImageView)findViewById(R.id.profile_picture);
...
}
布局在xml中定义
<merge xmlns:android="http://schemas.android.com/apk/res/android">
...
然后我在其他布局中使用它
情况1
// In this case android:layout_margin is specified so it should be used
<my.package.PersonView android:layout_margin="10dp" .../>
情况二
// In this case android:layout_margin is NOT specified so I want for my PersonView some default value should be used (say 5pt)
<my.package.PersonView .../>
我的自定义布局PersonView如何实现案例2?
解决方法:
类似问题已在https://stackoverflow.com/a/25982512/3554436解决
将android:layout_margin添加到attrs.xml
<declare-styleable name="PersonView">
...
<attr name="android:layout_margin" />
...
</declare-styleable>
像其他自定义属性一样访问属性:
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.PersonView);
float margin = a.getDimension(R.styleable.PersonView_android_layout_margin, 0);
...
boolean hasMargin = a.hasValue(R.styleable.PersonView_android_layout_margin);
标签:custom-controls,attributes,android 来源: https://codeday.me/bug/20191102/1994769.html