Android项目实战之仿网易顶部导航栏效果

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import android.app.ActivityGroup; 
import android.app.AlertDialog; 
import android.app.LocalActivityManager; 
import android.content.Context; 
import android.content.DialogInterface; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.KeyEvent; 
import android.view.View; 
import android.view.animation.Animation; 
import android.view.animation.AnimationUtils; 
import android.widget.Button; 
import android.widget.LinearLayout; 
import android.widget.RadioGroup; 
import android.widget.TextView; 
import android.widget.RadioGroup.OnCheckedChangeListener; 
 
public class AddExamActivity extends ActivityGroup { 
 
 protected Button btn_leftTop, btn_rightTop; 
 protected TextView tv_head; 
 
 private static LocalActivityManager manager; 
 private RadioGroup radioGroup; 
 private static LinearLayout container; 
 public static Context context; 
 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
 // TODO Auto-generated method stub 
 super.onCreate(savedInstanceState); 
 setContentView(R.layout.addexam); 
 cOntext=this; 
 initHead(); 
 
 manager=getLocalActivityManager(); 
 cOntainer= (LinearLayout)findViewById(R.id.container); 
 radioGroup=(RadioGroup) this.findViewById(R.id.add_tab_group); 
 
 container.removeAllViews(); 
 container.addView(manager.startActivity( 
 "PAGE_0", 
 new Intent(context, MyExamActivity.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)) 
 .getDecorView()); 
 
 radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() { 
 
 @Override 
 public void onCheckedChanged(RadioGroup group, int checkedId) { 
 // TODO Auto-generated method stub 
 switch (checkedId) { 
 case R.id.main_tab_addExam://添加考试 
  container.removeAllViews(); 
  container.addView(manager.startActivity( 
  "PAGE_0", 
  new Intent(context, MyExamActivity.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)) 
  .getDecorView()); 
  break; 
 case R.id.main_tab_myExam://我的考试 
  container.removeAllViews(); 
  container.addView(manager.startActivity( 
  "PAGE_1", 
  new Intent(context, MyMessageActivity.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)) 
  .getDecorView()); 
  break; 
 case R.id.main_tab_message://我的通知 
  container.removeAllViews(); 
  container.addView(manager.startActivity( 
  "PAGE_2", 
  new Intent(context, SettingActivity.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)) 
  .getDecorView()); 
  break; 
 case R.id.main_tab_testing://测试 
  container.removeAllViews(); 
  container.addView(manager.startActivity( 
  "PAGE_3", 
  new Intent(context, TestingActivity.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)) 
  .getDecorView()); 
  break; 
 case R.id.main_tab_settings://设置 
  container.removeAllViews(); 
  container.addView(manager.startActivity( 
  "PAGE_4", 
  new Intent(context, MyExamActivity.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)) 
  .getDecorView()); 
  break; 
 default: 
  //tabHost.setCurrentTabByTag("我的考试"); 
  break; 
 } 
 } 
 }); 
 } 
 public static void changeTo(){ 
 Animation slideLeftIn = AnimationUtils.loadAnimation(context, R.anim.slide_bottom_in_no_alpha); 
 
 container.removeAllViews(); 
 container.addView(manager.startActivity( 
 "PAGE_4", 
 new Intent(context, MyExamActivity.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)) 
 .getDecorView()); 
 container.startAnimation(slideLeftIn); 
 } 
 protected void initHead() { 
 btn_leftTop = (Button) findViewById(R.id.btn_leftTop); 
 btn_rightTop = (Button) findViewById(R.id.btn_rightTop); 
 tv_head = (TextView) findViewById(R.id.tv_head); 
 
 btn_leftTop.setVisibility(View.INVISIBLE); 
 tv_head.setText("添加考试"); 
 } 
 
 @Override 
 public boolean onKeyDown(int keyCode, KeyEvent event) { 
 // TODO Auto-generated method stub 
 
 if (keyCode == KeyEvent.KEYCODE_BACK) { 
 
 AlertDialog.Builder builder = new AlertDialog.Builder(getParent()); 
 builder.setMessage("你确定退出吗？") 
  .setCancelable(false) 
  .setPositiveButton("确定", 
  new DialogInterface.OnClickListener() { 
  public void onClick(DialogInterface dialog, 
   int id) { 
   finish(); 
   System.exit(0); 
  } 
  }) 
  .setNegativeButton("返回", 
  new DialogInterface.OnClickListener() { 
  public void onClick(DialogInterface dialog, 
   int id) { 
   dialog.cancel(); 
  } 
  }); 
 AlertDialog alert = builder.create(); 
 alert.show(); 
 return true; 
 } 
 
 return super.onKeyDown(keyCode, event); 
 } 
}