高仿微信的界面 - ActivityGroup + GridView 实现Tab分页

package com.tabtest; import android.app.ActivityGroup; import android.content.Intent; import android.graphics.Color; import android.graphics.drawable.ColorDrawable; import android.os.Bundle; import android.view.Gravity; import android.view.View; import android.view.ViewGroup.LayoutParams; import android.view.Window; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.GridView; import android.widget.LinearLayout; public class TabTestActivity extends ActivityGroup { private GridView gvTopBar; private ImageAdapter topImgAdapter; public LinearLayout container;// 装载sub Activity的容器 /** 顶部按钮图片 **/ int[] topbar_image_array = { R.drawable.tab_weixin_normal, R.drawable.tab_address_normal, R.drawable.tab_find_frd_normal, R.drawable.tab_settings_normal }; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.main); gvTopBar = (GridView) this.findViewById(R.id.gvTopBar); gvTopBar.setNumColumns(topbar_image_array.length);// 设置每行列数 gvTopBar.setSelector(new ColorDrawable(Color.TRANSPARENT));// 选中的时候为透明色 gvTopBar.setGravity(Gravity.CENTER);// 位置居中 gvTopBar.setVerticalSpacing(0);// 垂直间隔 int width = this.getWindowManager().getDefaultDisplay().getWidth() / topbar_image_array.length; int[] selectedResId = { R.drawable.tab_weixin_pressed, R.drawable.tab_address_pressed, R.drawable.tab_find_frd_pressed, R.drawable.tab_settings_pressed }; topImgAdapter = new ImageAdapter(this, topbar_image_array, width, 48, selectedResId); gvTopBar.setAdapter(topImgAdapter);// 设置菜单Adapter gvTopBar.setOnItemClickListener(new ItemClickEvent());// 项目点击事件 container = (LinearLayout) findViewById(R.id.Container); SwitchActivity(0);// 默认打开第0页 } class ItemClickEvent implements OnItemClickListener { public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { SwitchActivity(arg2); } } /* 根据ID打开指定的Activity */ public void SwitchActivity(int id) { topImgAdapter.setFocus(id);// 选中项获得高亮 container.removeAllViews();// 必须先清除容器中所有的View Intent intent = null; if (id == 0 || id == 2) { intent = new Intent(TabTestActivity.this, ActivityA.class); } else if (id == 1 || id == 3) { intent = new Intent(TabTestActivity.this, ActivityB.class); } intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); // Activity 转为 View Window subActivity = getLocalActivityManager().startActivity("subActivity", intent); // 容器添加View container.addView(subActivity.getDecorView(), LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT); } }