1.概念:在開發一些復雜界面,尤其是開發平板電腦頁面時,界面布局往往比手機布局復雜很多。此時就需要用到嵌套布局。同時為了達到某種效果,需要局部的頁面能夠動態的變化,最典型的就是在一個頁面中使用多個ViewPager。當這些ViewPager所在的頁面也是動態變化的時候,就需要實現多層LinearLayout的嵌套。比如一個標簽頁面,頭部是靜態的,內容部分是動態變化的,同時每個內容中又需要動態變化,代碼實現時就需要通過多次添加來實現。
2.下面是一個簡單的案例(該案例只是實現了多層嵌套的添加,如果需要實現動態的添加效果,只需通過控制條件改變每次添加的內容即可。)
PadTestActivity.java
package com.devin; import Android.app.Activity; import android.os.Bundle; import android.view.LayoutInflater; import android.widget.LinearLayout; public class PadTestActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); LayoutInflater inflater=getLayoutInflater(); //Add first page LinearLayout myFirst = (LinearLayout) inflater.inflate( R.layout.first, null).findViewById(R.id.myFirst); LinearLayout layoutMain = (LinearLayout)findViewById(R.id.LayoutMain); layoutMain.removeAllViews(); layoutMain.addView(myFirst); //Show the page first //Add second page LinearLayout mySecond = (LinearLayout) inflater.inflate( R.layout.second, null).findViewById(R.id.mySecond); LinearLayout layoutFirst = (LinearLayout) findViewById(R.id.LayoutFirst); layoutFirst.addView(mySecond); //Add third page LinearLayout myThird = (LinearLayout) inflater.inflate( R.layout.third, null).findViewById(R.id.myThird); LinearLayout layoutSecond = (LinearLayout) findViewById(R.id.LayoutSecond); layoutSecond.addView(myThird); } }
布局代碼
main.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Main Page" /> <LinearLayout android:id="@+id/LayoutMain" android:layout_width="fill_parent" android:layout_height="fill_parent" > </LinearLayout> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Main Page" /> </LinearLayout>
first.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/myFirst" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="First Page" /> <LinearLayout android:id="@+id/LayoutFirst" android:layout_width="fill_parent" android:layout_height="fill_parent" > </LinearLayout> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="First Page" /> </LinearLayout>
second.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/mySecond" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Second Page" /> <LinearLayout android:id="@+id/LayoutSecond" android:layout_width="fill_parent" android:layout_height="fill_parent" > </LinearLayout> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Second Page" /> </LinearLayout>
third.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/myThird" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Third Page" /> <LinearLayout android:id="@+id/LayoutThird" android:layout_width="fill_parent" android:layout_height="fill_parent" > </LinearLayout> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Third Page" /> </LinearLayout>
更多Android相關信息見Android 專題頁面 http://www.linuxidc.com/topicnews.aspx?tid=11