有些情况下需要把一个Activity分割成几部分,如上半部分绘制图形,下半部分显示图表,这时就需要用到ActivityGroup。
定义一个类继承自ActivityGroup,Java文件如下:
package com.h.callsta; import android.app.ActivityGroup; import android.app.LocalActivityManager; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.view.Window; import android.widget.LinearLayout; public class DetailActivity extends ActivityGroup{ private LinearLayout lo1, lo2; // LocalActivityManager对象 LocalActivityManager lam = getLocalActivityManager(); public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_detail); // 获得LinearLayout对象 lo1 = (LinearLayout) findViewById(R.id.lo1); lo2 = (LinearLayout) findViewById(R.id.lo2); start_activity(); } public void start_activity(){ // 加载两个窗口 Window win1 = lam.startActivity("0", new Intent(DetailActivity.this, DetailChart.class)); View view1 = win1.getDecorView(); lo1.addView(view1); Window win2 = lam.startActivity("1", new Intent(DetailActivity.this, DetailList.class)); View view2 = win2.getDecorView(); lo2.addView(view2); } }
在该类对应的XML布局文件中,定义了两个LinearLayout,分别用来显示两个Activity。
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/container" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <LinearLayout android:id="@+id/lo1" android:layout_width="fill_parent" android:layout_height="match_parent" android:layout_weight="1" android:orientation="vertical" > </LinearLayout> <LinearLayout android:id="@+id/lo2" android:layout_width="fill_parent" android:layout_height="match_parent" android:layout_weight="1" android:orientation="vertical" > </LinearLayout> </LinearLayout>
在Java文件中,通过getLocalActivityManager()获得LocalActivityManager对象,再通过findViewById()方法获得布局文件中的两个LinearLayout。最后,用LocalActivityManager对象的startActivity()方法,分别启动两个Activity--DetailChart(图形)和DetailList(列表),并分别用getDecorView()方法获得View对象,addView()到两个LinearLayout上,这样,就实现了在一个Activity类同时显示两个Activity。