转:android: 静态XML和动态加载XML混合使用,以及重写Layout控件
近期对android里面控件修改做了很多实验,由于公司需求很多,不得不重写很多控件。程序目标无非是:高效、轻巧、清晰、标准化
完成动态加载Layout有两种方法,依据个人喜好进行选择:
方法1:静态主Layout动态加载静态子Layout
首先构建子Layout:main2
<? xml version = "1.0" encoding = "utf-8" ?>
<!--布局可以任意定义,此处拿线性布局举例,里面有2个按钮元素-->
< LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android"
android:id = "@+id/menubar"
android:background = "@drawable/menubar"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content" >
<!--按钮1-->
< ImageButton android:id = "@+id/button1"
android:src = "@drawable/btn1"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
> </ ImageButton >
<!--按钮2-->
< ImageButton android:id = "@+id/button2"
android:src = "@drawable/btn2"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
> </ ImageButton >
</ LinearLayout >然后构建主Layout:main
<? xml version = "1.0" encoding = "utf-8" ?>
< RelativeLayout xmlns:android = "http://schemas.android.com/apk/res/android"
android:id = "@+id/background"
android:layout_width = "fill_parent"
android:layout_height = "fill_parent"
android:background = "@drawable/background" >
<!--主Layout要给子Layout设置一个容器box,可以在此指定容器的位置,这段是关键部分-->
< LinearLayout android:id = "@+id/box"
android:layout_alignParentBottom = "true"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:layout_centerHorizontal = "true" >
</ LinearLayout >
</ RelativeLayout >最后在程序中加载子layout:
public class BackgroundTest extends Activity {
/** Called when the activity is first created. */
// 子Layout要以view的形式加入到主Layout中
private View mBarView;
// 主Layout的容器加载子Layout的View
private LinearLayout mLinearLayout;
//给出关键内容
public void onCreate(Bundle savedInstanceState) {
super .onCreate(savedInstanceState);
// 显示主Layout
setContentView(R.layout.main);
// 加载子Layout
mBarView = View.inflate(this , R.layout.main2, null );
// 找到容器
mLinearLayout = (LinearLayout)findViewById(R.id.box);
// 加上View 结束
mLinearLayout.addView(mBarView);方法2:静态主Layout动态加载动态的Layout
首先构造你自己的子Layout和上面一样;
然后构建你自定义的Layout类:
public class MenuLandscapeLinearLayout extends LinearLayout{
// 构造函数
public MenuLandscapeLinearLayout(Context context) {
super (context);
// TODO Auto-generated constructor stub
//加载需要的属性,加载方法一的子Layout
((Activity) getContext()).getLayoutInflater().inflate(R.layout.main2, this );
//在此你可以封装很多方法
}
}最后在程序中动态实例化并加载即可:
public class BackgroundTest extends Activity {
/** Called when the activity is first created. */
private LinearLayout mLinearLayout;
//声明一个子Layout View对象
private MenuLandscapeLinearLayout mMenuLandscapeLinearLayout;
@Override
public void onCreate(Bundle savedInstanceState) {
super .onCreate(savedInstanceState);
// 加载主Layout
setContentView(R.layout.main);
// 找到容器
mLinearLayout = (LinearLayout)findViewById(R.id.box);
// 实例化一个子View
mMenuLandscapeLinearLayout=new MenuLandscapeLinearLayout( this );
// 添加到容器
mLinearLayout.addView(mMenuLandscapeLinearLayout);
}
}至此,完成了动态加载子Layout的两种形式,里面可思考的很多,比如封装常用事件、资源,从而节省代码、节省资源;
抛砖引玉,分享经验,希望能助大家优化自己的程序。
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