Main_HomeAty.java

package com.txsc.activity;

import com.txsc.MyApplication;
import com.txsc.R;
import com.txsc.fragment.Car_HomeFrag;
import com.txsc.fragment.Main_HomeFrag;
import com.txsc.fragment.My_HomeFrag;
import com.txsc.fragment.Sort_HomeFrag;
import com.txsc.utils.SPUtils;

import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTabHost;
import android.view.KeyEvent;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.TabHost.TabSpec;

/**
 * 主界面，管理Tab标签
 * 
 * @author Admin
 *
 */
public class Main_HomeAty extends FragmentActivity implements
		OnCheckedChangeListener {

	// 定义FragmentTabHost对象
	public static FragmentTabHost mTabHost;
	private RadioGroup mTabRg;
	public static RadioButton rbHome;
	public static RadioButton rbCar;
	public static Context mContext;
	private int tabNum;

	@SuppressWarnings("rawtypes")
	private final Class[] fragments = { Main_HomeFrag.class,
			Sort_HomeFrag.class, Car_HomeFrag.class, My_HomeFrag.class };

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		MyApplication.getInstance().addActivity(this);
		setContentView(R.layout.tab_main_home_layout);
		tabNum = getIntent().getIntExtra("tabNum", 0);
		mContext = this;
		initView();
	}
	@Override
	protected void onResume() {
		super.onResume();
		if(SPUtils.getToCar(this)){
			rbCar.setChecked(true);
			SPUtils.saveToCar(this, false);
		}
	}
	private void initView() {
		mTabHost = (FragmentTabHost) findViewById(android.R.id.tabhost);
		mTabHost.setup(this, getSupportFragmentManager(), R.id.realtabcontent);
		// 得到fragment的个数
		int count = fragments.length;
		for (int i = 0; i < count; i++) {
			// 为每一个Tab按钮设置图标、文字和内容
			TabSpec tabSpec = mTabHost.newTabSpec(i + "").setIndicator(i + "");
			// 将Tab按钮添加进Tab选项卡中
			mTabHost.addTab(tabSpec, fragments[i], null);
		}
		rbHome = (RadioButton) findViewById(R.id.tab_rb_1);
		rbCar = (RadioButton) findViewById(R.id.tab_rb_3);
		mTabRg = (RadioGroup) findViewById(R.id.tab_rg_menu);
		mTabRg.setOnCheckedChangeListener(this);
		if (tabNum == 2) {
			rbCar.setChecked(true);
		} else {
			mTabHost.setCurrentTab(tabNum);
		}
	}

	public static void setHome() {
		rbHome.setChecked(true);
	}
	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if (keyCode == KeyEvent.KEYCODE_BACK) {
			showExitDialog();
			return false;
		} else {
			return super.onKeyDown(keyCode, event);
		}
	}

	public static void showExitDialog() {
		AlertDialog.Builder dialog = new Builder(mContext);
		dialog.setTitle("提醒");
		dialog.setMessage("确认退出吗？");
		dialog.setNegativeButton("确定", new OnClickListener() {

			@Override
			public void onClick(DialogInterface dialog, int which) {
				MyApplication.getInstance().finishAllActivity();
			}
		});
		dialog.setPositiveButton("取消", null);
		dialog.show();
	}

	@Override
	public void onCheckedChanged(RadioGroup group, int checkedId) {
		switch (checkedId) {
		case R.id.tab_rb_1:
			mTabHost.setCurrentTab(0);
			break;
		case R.id.tab_rb_2:
			mTabHost.setCurrentTab(1);
			break;
		case R.id.tab_rb_3:
			mTabHost.setCurrentTab(2);
			break;
		case R.id.tab_rb_4:
			mTabHost.setCurrentTab(3);
			break;
		default:
			break;
		}
	}

}