Android app 启动画面实现

1.直接上代码

 

package com.holl.vwifi.login.ui;


import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserFactory;

import cn.jpush.android.api.InstrumentedActivity;

import com.holl.vwifi.R;
import com.holl.vwifi.application.AppContext;
import com.holl.vwifi.login.bean.ApkInfo;
import com.holl.vwifi.login.bean.MyDevInfo;
import com.holl.vwifi.login.bean.User;
import com.holl.vwifi.login.common.CommandManagement;
import com.holl.vwifi.login.db.DbManager;
import com.holl.vwifi.login.task.DownLoadFileTask;
import com.holl.vwifi.util.ComHelper;
import com.holl.vwifi.util.Logger;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.DialogInterface.OnClickListener;
import android.content.pm.PackageManager.NameNotFoundException;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.widget.LinearLayout;
import android.widget.Toast;

/**
 * 应用程序启动类：显示欢迎界面并跳转到主界面
 * @Description: (这里用一句话描述这个类的作用)
 * @author yehj
 * @date 2014-8-7    上午9:28:15 
 * @version 1.01
 */
public class AppStart extends InstrumentedActivity {
    private static final String TAG="AppStart";
    private MyDevInfo devInfo;
    private ProgressDialog progressDialog ;
    private static final String SHAREDPREFERENCES_NAME = "first_pref";
    private static final String transferIp="112.124.124.183";
    private boolean  isFirstIn ;
    private AppContext appContext;// 全局Context
    ApkInfo info=null;
    DownLoadFileThreadTask task;
    
    private Handler mHandler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            // 判断服务器版本号 和客户端的版本号 是否相同
            if(msg.what==0){
                //showUpdataDialog();//弹出来升级对话框
            }
        
            if(msg.what==1){//下载
                progressDialog.show();
                new Thread(task).start();
            }
            if(msg.what==2){//下载过程中，网络异常
                Toast.makeText(AppStart.this,R.string.download_apk_fail,Toast.LENGTH_SHORT).show();
                progressDialog.dismiss();
             }
            if(msg.what==3){//到导航页面
            
             }
            }
        };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        
         final View view = View.inflate(this, R.layout.start, null);
         LinearLayout wellcome = (LinearLayout) view.findViewById(R.id.app_start_view);
         setContentView(view);
         appContext = (AppContext) getApplication();
         
         //渐变展示启动屏
         AlphaAnimation aa = new AlphaAnimation(0.3f,1.0f);
         aa.setDuration(2000);
         view.startAnimation(aa);
         aa.setAnimationListener(new AnimationListener()
             {
               @Override
                public void onAnimationEnd(Animation arg0) {
                    redirectTo();
             }
                @Override
                public void onAnimationRepeat(Animation animation) {}
                @Override
                public void onAnimationStart(Animation animation) {}
                
            });
        
            progressDialog = new ProgressDialog(this);
            progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
            progressDialog.setMessage(this.getResources().getText(R.string.downloading));
            progressDialog.setCancelable(false);//注意一下
         new Thread(){
                @Override
                public void run() {
                    try {
                        sleep(1000);
                        //handler.sendEmptyMessage(0);
                        if (isNeedUpdate(getVerCode())) {
                                    //弹出来升级对话框
                            mHandler.sendEmptyMessage(0);
                        }
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                }
            }.start();
        
    }




    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
    }
    
    
    /**
     * 跳转到...
     */
    private void redirectTo(){  
        
        SharedPreferences preferences = getSharedPreferences(
                SHAREDPREFERENCES_NAME, MODE_PRIVATE);
        // 取得相应的值，如果没有该值，说明还未写入，用true作为默认值
        isFirstIn = preferences.getBoolean("isFirstIn", true);
        Intent intent=null;
        if(isFirstIn){
            intent= new Intent(this, GuideActivity.class);
            startActivity(intent);    
        }else{
            Logger.d(TAG,appContext.ifHaveUserLogin()+"" );
            if(appContext.ifHaveUserLogin()){
                intent= new Intent(this, LoginBindRouter.class);
                startActivity(intent);    
            }else{
                if(ComHelper.isWifiConnected(appContext)){                
                    appContext.getCom().connectVwifi(null, null, ComHelper.getGateWay(appContext), transferIp);
                    int flag=appContext.getCom().connectvwifiready();
                    Logger.d("yehj","flag=="+flag);
                    if(flag==0){
                        devInfo=appContext.getCom().getMyDevInfo();
                        if(devInfo!=null&&devInfo.getRes()!=null&&devInfo.getRes().equals("0")){
                            appContext.setWifiSSID(devInfo.getAp_Info().getSSID());
                            Logger.d("yehj", "STATUS=="+devInfo.getSTATUS());
                            if(devInfo.getSTATUS()!=null&&devInfo.getSTATUS().equals("0")){
                            intent=new Intent(this,CheckWanActivity.class);
                            startActivity(intent);
                             
                       }else{

                              intent=new Intent(this,LoginBindRouter.class);
                              startActivity(intent);
                       }
                    }    
                }else{
                    intent=new Intent(this,LoginBindRouter.class);
                    startActivity(intent);    
                }
                    
              }else{
                 intent=new Intent(this,LoginBindRouter.class);
                  startActivity(intent);
              }
                } 
            }    
        finish();
    }
    
    /**
     * 
     * @param versiontext
     *            当前客户端的版本号信息
     * @return 是否需要更新
     */
    private boolean isNeedUpdate(int versionCode) {
        try {
            info =getUpdateApkInfo();
            int latestCode = info.getVersionCode();//这里info可以为空，会跳到异常处理里面
            if (latestCode<=versionCode) {
                //Log.i("splashActivity", "版本相同,无需升级, 进入主界面");
                return false;
            } else {
                //Log.i("splashActivity", "版本不同,需要升级");
                return true;
            }
        } catch (Exception e) {
            e.printStackTrace();
            //Log.i("splashActivity", "获取更新信息异常, 进入主界面");
            return false;
        }

    }

    public  int getVerCode() {  
        int verCode = -1;  
        try {  
           verCode = this.getPackageManager().getPackageInfo("com.holl.vwifi", 0).versionCode;   
        } catch (NameNotFoundException e) {  
           e.printStackTrace();
        }  
         return verCode;  
    } 
    
    /**
     * 安装apk
     * @param file
     */
    private void install(File file){
        Intent intent = new Intent();
        intent.setAction(Intent.ACTION_VIEW);
        intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");
        finish();
        startActivity(intent);
    }
    
    //检查版本更新
      private ApkInfo getUpdateApkInfo(){
          ApkInfo   apkInfo=null;
          InputStream inputStream=null;
          HttpURLConnection connection=null;
           try {
               URL url=new URL("http://www.holl.cn/APP/android/holl_smart.xml");
               connection= (HttpURLConnection)url.openConnection();//
               connection.setRequestMethod("GET");
               connection.setConnectTimeout(2000);//设置连接主机超时（单位：毫秒）
               connection.setReadTimeout(2000);//设置从主机读取数据超时（单位：毫秒）
               if(connection.getResponseCode()!= 200){
                   return apkInfo;
               }
               inputStream=connection.getInputStream();
               XmlPullParserFactory pullParserFactory = XmlPullParserFactory.newInstance();
               XmlPullParser parser = pullParserFactory.newPullParser();
               parser.setInput(inputStream, "UTF-8"); // 编码
               int event = parser.getEventType();// 产生第一个事件
              while (event!=parser.END_DOCUMENT) {
                  switch (event) {
                    case XmlPullParser.START_DOCUMENT:
                        apkInfo = new ApkInfo();
                        break;
                    case XmlPullParser.START_TAG:// 判断当前事件是否是标签元素开始事件
                         String tempParser=parser.getName();
                         if ("name".equalsIgnoreCase(tempParser)) // 判断开始标签元素是否是CMD_RES
                         {
                            apkInfo.setName(parser.nextText());
                         }
                         // 开始解析XML  
                         else if("version".equalsIgnoreCase(tempParser)){
                              apkInfo.setVersion(parser.nextText());
                           }
                         else if("versionCode".equalsIgnoreCase(tempParser)){
                             apkInfo.setVersionCode(Integer.parseInt(parser.nextText()));
                           }
                         else if("desc".equalsIgnoreCase(tempParser)){
                             apkInfo.setDes(parser.nextText());
                           }
                         else if("url".equalsIgnoreCase(tempParser)){
                             apkInfo.setUrl(parser.nextText());
                           }
                    case XmlPullParser.END_TAG:
                        break;
                    }
                    event = parser.next();//进入下一个元素并触发相应事件  
            }
        } catch (Exception e) {
            e.printStackTrace();
             apkInfo=null;
        }finally {
                try {
                     if(inputStream != null)
                      inputStream.close();
                      if(connection!=null)    connection.disconnect();
                } catch (IOException e) {
                    e.printStackTrace();
                }
        }
             return apkInfo;
      }
      
      /**
         * 升级的对话框
         */
        private void showUpdataDialog() {
            AlertDialog.Builder buider = new Builder(this);
            buider.setIcon(R.drawable.prompt);
            buider.setTitle("升级提醒");
            buider.setMessage("汇尔微管家"+info.getVersion()+"发布了！\n"+"更新内容： "+info.getDes());
            buider.setCancelable(false); // 让用户不能取消对话框
            buider.setPositiveButton("马上升级", new OnClickListener() {

                public void onClick(DialogInterface dialog, int which) {
                    //Log.i("splashActivity", "下载apk文件" + info.getUrl());
                    if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
                        task=new DownLoadFileThreadTask(info.getUrl(), "/sdcard/holl/holl_smart.apk");
                        mHandler.sendEmptyMessage(1);
                    }else{
                        Toast.makeText(getApplicationContext(), "sd卡不可用",Toast.LENGTH_SHORT).show();
                    }
                }
            });
            buider.setNegativeButton("以后再说", new OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    //Log.i("splashActivity", "用户取消进入程序主界面")
                }
            });
            buider.create().show();
        }
        
        private class DownLoadFileThreadTask implements Runnable {
            private String path; // 服务器路径
            private String filepath; // 本地文件路径

            public DownLoadFileThreadTask(String path, String filepath) {
                this.path = path;
                this.filepath = filepath;
            }

            public void run() {
                try {
                    File file = DownLoadFileTask.getFile(path, filepath,progressDialog);
                    //Log.i("splashActivity","下载成功");
                    progressDialog.dismiss();
                    install(file);
                } catch (Exception e) {
                    e.printStackTrace();
                    mHandler.sendEmptyMessage(2);//"下载fail"
                }
            }
        }

}


布局文件很简单

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/app_start_view"
    android:orientation="vertical"
    android:layout_width="fill_parent"
	android:layout_height="fill_parent"
	android:gravity="bottom"
    android:background="@drawable/start_background">
    
</LinearLayout>