首先,從SDK中doc文檔中都可以獲知,ActivityGroup類的父類是Activity(見下圖),也就是說二者具有相同的接口和生命週期,同Activity一樣,也有onCreate()、onPause()等函數可供我們重載。
ActivityGroup中有兩個public方法(下圖):ActivityGroup中可以調用getLocalActivityManage()方法獲取LocalActityManage來管理Activity。
ActivityGroup實現的tab功能的效果圖如下。
先看一下java代碼:
public class MainView extends ActivityGroup {
@SuppressWarnings("unused")
private LinearLayout bodyView,headview;
private LinearLayout one, two, three, four;
private int flag = 0; // 通過標記跳轉不同的頁面,顯示不同的菜單項
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.view_main);
initMainView();
// 顯示標記頁面
showView(flag);
one.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
flag = 0;
showView(flag);
}
});
two.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
flag = 1;
showView(flag);
}
});
three.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
flag = 2;
showView(flag);
}
});
four.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
flag = 3;
showView(flag);
}
});
}
/*
* 初始化主界面
*/
public void initMainView() {
headview=(LinearLayout) findViewById(R.id.head);
bodyView=(LinearLayout) findViewById(R.id.body);
one=(LinearLayout) findViewById(R.id.one);
two=(LinearLayout) findViewById(R.id.two);
three=(LinearLayout) findViewById(R.id.three);
four=(LinearLayout) findViewById(R.id.four);
}
// 在主界面中顯示其他界面
public void showView(int flag) {
switch (flag) {
case 0:
bodyView.removeAllViews();
View v = getLocalActivityManager().startActivity("one",
new Intent(MainView.this, OneView.class)).getDecorView();
one.setBackgroundResource(R.drawable.frame_button_background);
two.setBackgroundResource(R.drawable.frame_button_nopressbg);
three.setBackgroundResource(R.drawable.frame_button_nopressbg);
four.setBackgroundResource(R.drawable.frame_button_nopressbg);
bodyView.addView(v);
break;
case 1:
bodyView.removeAllViews();
bodyView.addView(getLocalActivityManager().startActivity("two",
new Intent(MainView.this, TwoView.class))
.getDecorView());
one.setBackgroundResource(R.drawable.frame_button_nopressbg);
two.setBackgroundResource(R.drawable.frame_button_background);
three.setBackgroundResource(R.drawable.frame_button_nopressbg);
four.setBackgroundResource(R.drawable.frame_button_nopressbg);
break;
case 2:
bodyView.removeAllViews();
bodyView.addView(getLocalActivityManager().startActivity(
"three", new Intent(MainView.this, ThreeView.class))
.getDecorView());
one.setBackgroundResource(R.drawable.frame_button_nopressbg);
two.setBackgroundResource(R.drawable.frame_button_nopressbg);
three.setBackgroundResource(R.drawable.frame_button_background);
four.setBackgroundResource(R.drawable.frame_button_nopressbg);
break;
case 3:
bodyView.removeAllViews();
bodyView.addView(getLocalActivityManager().startActivity(
"four", new Intent(MainView.this, FourView.class))
.getDecorView());
one.setBackgroundResource(R.drawable.frame_button_nopressbg);
two.setBackgroundResource(R.drawable.frame_button_nopressbg);
three.setBackgroundResource(R.drawable.frame_button_nopressbg);
four.setBackgroundResource(R.drawable.frame_button_background);
break;
default:
break;
}
}
}