大家好，今天主要是實現仿大眾點評引導頁和主頁面以及城市定位的實現，主要使用ViewPager+Fragment+SharedPreferences,實現了第一次打開程序出現引導頁，再次打開跳過引導頁，這也是一般應用常用的應用基本架構方式。下面首先來看最終實現效果如下圖：
1.布局文件說明
1）歡迎頁布局文件welcome.xml
2) 引導頁布局文件welcome_guide.xml
3）首頁布局文件main_home.xml
4）團購布局文件main_tuan.xml
5) 發現布局文件main_search.xml
6) 我的布局文件main_my.xml
布局文件內容較多，布局代碼就不一一貼出來了，請看附件詳細源碼。
2.Activity說明
1）歡迎頁Activity(WelcomeStartActivity)
package com.sunny.dianping_client;
import java.util.Timer;
import java.util.TimerTask;
import com.sunny.dianping_client.utils.SharedUtils;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
public class WelcomeStartActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.welcome);
//使用Handler實現延時跳轉
// new Handler(new Handler.Callback() {
//
// @Override
// public boolean handleMessage(Message msg) {
// // 頁面跳轉
// startActivity(new Intent(getApplicationContext(), MainActivity.class));
// return false;
// }
// }).sendEmptyMessageDelayed(0, 3000);//表示任務延時三秒執行
//使用Java定時器實現延時跳轉
Timer timer = new Timer();
timer.schedule(new Task(), 3000);//定時器延時執行任務的方法
}
class Task extends TimerTask{
@Override
public void run() {
// 實現頁面的跳轉
//不是第一次啟動
if (SharedUtils.getWelcomeFlag(getBaseContext())) {
startActivity(new Intent(getBaseContext(),MainActivity.class));
}else {
startActivity(new Intent(WelcomeStartActivity.this, WelcomeGuideActivity.class));
//保存訪問記錄
SharedUtils.putWelcomeFlag(getBaseContext(), true);
}
finish();
}
}
}2) 引導頁Activity(WelcomeGuideActivity)
package com.sunny.dianping_client;
import java.util.ArrayList;
import java.util.List;
import com.lidroid.xutils.ViewUtils;
import com.lidroid.xutils.view.annotation.ViewInject;
import com.lidroid.xutils.view.annotation.event.OnClick;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
public class WelcomeGuideActivity extends Activity {
@ViewInject(R.id.btn_welcome_guide)
private Button mComeIn;
@ViewInject(R.id.id_welcome_pager)
private ViewPager mViewPager;
private List<View> list;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO 自動生成的方法存根
super.onCreate(savedInstanceState);
setContentView(R.layout.welcome_guide);
ViewUtils.inject(this);
initViewPager();
}
@OnClick(R.id.btn_welcome_guide)
public void click(View view){
// 實現頁面的跳轉
startActivity(new Intent(getBaseContext(), MainActivity.class));
finish();
}
//初始化ViewPager
public void initViewPager(){
list = new ArrayList<View>();
ImageView iv = new ImageView(this);
iv.setImageResource(R.drawable.guide_01);
list.add(iv);
ImageView iv1 = new ImageView(this);
iv1.setImageResource(R.drawable.guide_02);
list.add(iv1);
ImageView iv2 = new ImageView(this);
iv2.setImageResource(R.drawable.guide_03);
list.add(iv2);
mViewPager.setAdapter(new MyPagerAdapter());
//監聽ViewPager滑動效果
mViewPager.setOnPageChangeListener(new OnPageChangeListener() {
//頁卡被選中的效果
@Override
public void onPageSelected(int arg0) {
if (arg0==2) {
mComeIn.setVisibility(View.VISIBLE);
}else {
mComeIn.setVisibility(View.GONE);
}
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
@Override
public void onPageScrollStateChanged(int arg0) {
}
});
}
//定義ViewPager的適配器
class MyPagerAdapter extends PagerAdapter{
//計算需要多少Items顯示
@Override
public int getCount() {
return list.size();
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0==arg1;
}
//初始化Item實例的方法
@Override
public Object instantiateItem(ViewGroup container, int position) {
container.addView(list.get(position));
return list.get(position);
}
//Item銷毀的方法
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
/**
* 銷毀Item的方法不使用系統定義銷毀Item的方法，而是使用我們自己定義的形式，將一個View對象從ViewPager中移除
*/
//super.destroyItem(container, position, object);
container.removeView(list.get(position));
}
}
}3) 主頁面Activity(MainActivity)
package com.sunny.dianping_client;
import com.lidroid.xutils.ViewUtils;
import com.lidroid.xutils.view.annotation.ViewInject;
import com.lidroid.xutils.view.annotation.event.OnClick;
import com.sunny.dianping_client.fragment.FragmentHome;
import com.sunny.dianping_client.fragment.FragmentMy;
import com.sunny.dianping_client.fragment.FragmentSearch;
import com.sunny.dianping_client.fragment.FragmentTuan;
import android.os.Bundle;
import android.app.Activity;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.Toast;
public class MainActivity extends FragmentActivity implements OnCheckedChangeListener{
@ViewInject(R.id.main_bottom_tabs)
private RadioGroup mGroup;
@ViewInject(R.id.main_home)
private RadioButton main_home;
private FragmentManager fragmentManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
ViewUtils.inject(this);
//初始化FragmentManager
fragmentManager = getSupportFragmentManager();
//設置默認選中
main_home.setChecked(true);
mGroup.setOnCheckedChangeListener(this);
changeFragment(new FragmentHome(), false);
}
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
// 選中不同的Fragment
switch (checkedId) {
case R.id.main_home://首頁
changeFragment(new FragmentHome(), true);
break;
case R.id.main_tuan://團購
changeFragment(new FragmentTuan(), true);
break;
case R.id.main_search://發現
changeFragment(new FragmentSearch(), true);
break;
case R.id.main_my://我的
changeFragment(new FragmentMy(), true);
break;
default:
break;
}
}
//切換不同的Fragment
public void changeFragment(Fragment fragment,boolean isInit){
//開啟事物
FragmentTransaction beginTransaction = fragmentManager.beginTransaction();
beginTransaction.replace(R.id.main_content, fragment);
if (!isInit) {
//加上該段代碼Fragment就不會出現重影的效果
beginTransaction.addToBackStack(null);
}
beginTransaction.commit();
}
}3.主界面Fragment的實現
1）首頁Fragment(FragmentHome)
package com.sunny.dianping_client.fragment;
import java.util.List;
import com.lidroid.xutils.ViewUtils;
import com.lidroid.xutils.view.annotation.ViewInject;
import com.sunny.dianping_client.R;
import com.sunny.dianping_client.utils.SharedUtils;
import android.support.v4.app.Fragment;
import android.content.Context;
import android.content.Intent;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.provider.Settings;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class FragmentHome extends Fragment implements LocationListener{
@ViewInject(R.id.main_top_city)
private TextView mTopcity;
private String cityName;
private LocationManager locationManager;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.main_home, container, false);
ViewUtils.inject(this, view);
//獲取數據并顯示
mTopcity.setText(SharedUtils.getCityName(getActivity()));
return view;
}
@Override
public void onStart() {
super.onStart();
// 檢查GPS是否打開
checkGPSisOpen();
}
//檢查Gps是否打開
private void checkGPSisOpen() {
// 獲取當前LocationManager對象
locationManager = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE);
boolean isOpen = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
if (!isOpen) {
Intent intent = new Intent();
intent.setAction(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivityForResult(intent, 0);
}
//開始定位
startLocation();
}
//使用GPS定位的方法
private void startLocation() {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 2000, 10, this);
}
//接收并處理消息
private Handler handler = new Handler(new Handler.Callback() {
@Override
public boolean handleMessage(Message msg) {
if (msg.what==1) {
mTopcity.setText(cityName);
}
return false;
}
});
//獲取對應位置的經緯度并且定位城市
private void updateWithNewLocation(Location location) {
double lat = 0.0,lng = 0.0;
if (location!=null) {
lat = location.getLatitude();
lng = location.getLongitude();
Log.i("TAG", "經度是"+lat+"緯度是"+lng);
}else {
cityName = "無法獲取城市信息";
}
//通過經緯度獲取地址
List<Address> list = null;
Geocoder geocoder = new Geocoder(getActivity());
try {
list = geocoder.getFromLocation(lat, lng, 2);
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
if (list!=null&&list.size()>0) {
for (int i = 0; i < list.size(); i++) {
Address address = list.get(i);
cityName = address.getLocality();//獲取城市
}
}
//發送空消息
handler.sendEmptyMessage(1);
}
//位置信息更改執行方法
@Override
public void onLocationChanged(Location location) {
// 更新當前的位置信息
updateWithNewLocation(location);
}
//狀態信息改變
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
public void onDestroy() {
super.onDestroy();
//保存城市
SharedUtils.putCityName(getActivity(), cityName);
//停止定位
stopLocation();
}
//停止定位
private void stopLocation(){
locationManager.removeUpdates(this);
}
}2)團購頁Fragment(FragmentTuan)
package com.sunny.dianping_client.fragment;
import com.sunny.dianping_client.R;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class FragmentTuan extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.main_tuan, container, false);
}
}3)發現頁Fragment(FragmentSearch)
package com.sunny.dianping_client.fragment;
import com.sunny.dianping_client.R;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class FragmentSearch extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.main_search, container, false);
}
}4)我的頁Fragment(FragmentMy)
package com.sunny.dianping_client.fragment;
import com.sunny.dianping_client.R;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class FragmentMy extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.main_my, container, false);
}
}4.使用SharedPreferences實現標記的寫入與讀取
package com.sunny.dianping_client.utils;
import android.R.bool;
import android.content.Context;
import android.content.SharedPreferences.Editor;
import android.widget.EditText;
/**
* 實現標記的寫入讀取
* @author sunnyhack
*/
public class SharedUtils {
private static final String FILE_NAME = "dianping";
private static final String MODE_NAME = "welcome";
// 獲取flag標記值
public static boolean getWelcomeFlag(Context context) {
return context.getSharedPreferences(FILE_NAME, context.MODE_PRIVATE)
.getBoolean(MODE_NAME, false);
}
// 寫入flag標記值
public static void putWelcomeFlag(Context context, boolean isFirst) {
Editor editor = context.getSharedPreferences(FILE_NAME,
context.MODE_APPEND).edit();
editor.putBoolean(MODE_NAME, isFirst);
editor.commit();
}
// 寫入一個String類型的數據
public static void putCityName(Context context, String cityName) {
Editor editor = context.getSharedPreferences(FILE_NAME,
Context.MODE_APPEND).edit();
editor.putString("cityName", cityName);
editor.commit();
}
// 獲取String類型的值
public static String getCityName(Context context) {
return context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE)
.getString("cityName", "選擇城市");
}
}5.主界面按鈕圖片和文字的變色（主要使用選擇器實現）
1）字體顏色選擇器main_color_selector.xml
2）首頁圖片變色選擇器main_home_selector.xml
2）團購圖片變色選擇器main_tuan_selector.xml
2）發現圖片變色選擇器main_search_selector.xml
2）我的圖片變色選擇器main_my_selector.xml
以上就是引導頁和主界面的實現，記錄下來給大家分享，一起交流學習~~
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