package com.example.fragmentdemo;
import java.util.Timer;
import java.util.TimerTask;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.Window;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import android.app.Activity;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Color;
public class MainActivity extends Activity implements
OnClickListener {
private MessageFragment messageFragment;
private ContactsFragment contactsFragment;
private NewsFragment newsFragment;
private SettingFragment settingFragment;
private View messageLayout;
private View contactsLayout;
private View newsLayout;
private View settingLayout;
private ImageView messageImage;
private ImageView contactsImage;
private ImageView newsImage;
private ImageView settingImage;
private TextView messageText;
private TextView contactsText;
private TextView newsText;
private TextView settingText;
private FragmentManager fragmentManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
initViews();
fragmentManager = getFragmentManager();
// 第一次启动时选中第0个tab
setTabSelection(0);
SharedPreferences pref = getSharedPreferences("data",
MODE_PRIVATE);
String name = pref.getString("name", "");
String pass = pref.getString("pass", "");
// 判断字符串
// 1 null
// 2“”
// 3 “ ”
// 初始化布局元素
if (name == "" || pass == "") {
Intent intent = new Intent(MainActivity.this,
loginActivity.class);
startActivityForResult(intent, 1);
}
}
@Override
protected void onActivityResult(int requestCode, int
resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case 1:
if (resultCode == RESULT_OK) {
Bundle bu = data.getBundleExtra("user");
User use = (User) bu.get("userinfo");
String name = use.getName();
Toast.makeText(MainActivity.this, "名称是："+name,
Toast.LENGTH_LONG)
.show();
} else {
Intent intent = new Intent(MainActivity.this,
loginActivity.class);
startActivityForResult(intent, 1);
}
break;
default:
break;
}
}
private void initViews() {
messageLayout = findViewById(R.id.message_layout);
contactsLayout = findViewById(R.id.contacts_layout);
newsLayout = findViewById(R.id.news_layout);
settingLayout = findViewById(R.id.setting_layout);
messageImage = (ImageView)
findViewById(R.id.message_image);
contactsImage = (ImageView)
findViewById(R.id.contacts_image);
newsImage = (ImageView) findViewById(R.id.news_image);
settingImage = (ImageView)
findViewById(R.id.setting_image);
messageText = (TextView)
findViewById(R.id.message_text);
contactsText = (TextView)
findViewById(R.id.contacts_text);
newsText = (TextView) findViewById(R.id.news_text);
settingText = (TextView)
findViewById(R.id.setting_text);
messageLayout.setOnClickListener(this);
contactsLayout.setOnClickListener(this);
newsLayout.setOnClickListener(this);
settingLayout.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.message_layout:
// 当点击了消息tab时，选中第1个tab
setTabSelection(0);
break;
case R.id.contacts_layout:
// 当点击了联系人tab时，选中第2个tab
setTabSelection(1);
break;
case R.id.news_layout:
// 当点击了动态tab时，选中第3个tab
setTabSelection(2);
break;
case R.id.setting_layout:
// 当点击了设置tab时，选中第4个tab
setTabSelection(3);
break;
default:
break;
}
}
private void setTabSelection(int index) {
// 每次选中之前先清楚掉上次的选中状态
clearSelection();
// 开启一个Fragment事务
FragmentTransaction transaction =
fragmentManager.beginTransaction();
// 先隐藏掉所有的Fragment，以防止有多个Fragment显示在界面上的情况
hideFragments(transaction);
switch (index) {
case 0:
// 当点击了消息tab时，改变控件的图片和文字颜色
messageImage.setImageResource(R.drawable.message_selected);
messageText.setTextColor(Color.WHITE);
if (messageFragment == null) {
// 如果MessageFragment为空，则创建一个并添加到界面上
messageFragment = new MessageFragment();
transaction.add(R.id.content, messageFragment);
} else {
// 如果MessageFragment不为空，则直接将它显示出来
transaction.show(messageFragment);
}
break;
case 1:
// 当点击了联系人tab时，改变控件的图片和文字颜色
contactsImage.setImageResource(R.drawable.contacts_selected);
contactsText.setTextColor(Color.WHITE);
if (contactsFragment == null) {
// 如果ContactsFragment为空，则创建一个并添加到界面上
contactsFragment = new ContactsFragment();
transaction.add(R.id.content, contactsFragment);
} else {
// 如果ContactsFragment不为空，则直接将它显示出来
transaction.show(contactsFragment);
}
break;
case 2:
// 当点击了动态tab时，改变控件的图片和文字颜色
newsImage.setImageResource(R.drawable.news_selected);
newsText.setTextColor(Color.WHITE);
if (newsFragment == null) {
// 如果NewsFragment为空，则创建一个并添加到界面上
newsFragment = new NewsFragment();
transaction.add(R.id.content, newsFragment);
} else {
// 如果NewsFragment不为空，则直接将它显示出来
transaction.show(newsFragment);
}
break;
case 3:
default:
// 当点击了设置tab时，改变控件的图片和文字颜色
settingImage.setImageResource(R.drawable.setting_selected);
settingText.setTextColor(Color.WHITE);
if (settingFragment == null) {
// 如果SettingFragment为空，则创建一个并添加到界面上
settingFragment = new SettingFragment();
transaction.add(R.id.content, settingFragment);
} else {
// 如果SettingFragment不为空，则直接将它显示出来
transaction.show(settingFragment);
}
break;
}
transaction.commit();
}
private void clearSelection() {
messageImage.setImageResource(R.drawable.message_unselected);
messageText.setTextColor(Color.parseColor("#82858b"));
contactsImage.setImageResource(R.drawable.contacts_unselected);
contactsText.setTextColor(Color.parseColor("#82858b"));
newsImage.setImageResource(R.drawable.news_unselected);
newsText.setTextColor(Color.parseColor("#82858b"));
settingImage.setImageResource(R.drawable.setting_unselected);
settingText.setTextColor(Color.parseColor("#82858b"));
}
private void hideFragments(FragmentTransaction transaction)
{
if (messageFragment != null) {
transaction.hide(messageFragment);
}
if (contactsFragment != null) {
transaction.hide(contactsFragment);
}
if (newsFragment != null) {
transaction.hide(newsFragment);
}
if (settingFragment != null) {
transaction.hide(settingFragment);
}
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
if (keyCode == KeyEvent.KEYCODE_BACK) {
exitBy2Click(); // 调用双击退出函数
}
return false;
}
private static Boolean isExit = false;
private void exitBy2Click() {
Timer tExit = null;
if (isExit == false) {
isExit = true; // 准备退出
Toast.makeText(this, "再按一次退出程序",
Toast.LENGTH_SHORT).show();
tExit = new Timer();
tExit.schedule(new TimerTask() {
public void run() {
isExit = false; // 取消退出
}
}, 2000); // 如果2秒钟内没有按下返回键，则启动定时器取消掉刚才执行的任务
} else {
finish();
System.exit(0);
}
}
}