android APP实现更新 PHP后台服务器

这里需要解释的是

function updateInfo()

function download(){

new Thread() {
         public void run() {        
            HttpClient client = new DefaultHttpClient();
            HttpGet get = new HttpGet(url);
            HttpResponse response;
            try {
               response = client.execute(get);
               HttpEntity entity = response.getEntity();
               int length = (int) entity.getContentLength();
                                        progressDialog.setMax(length);
               InputStream is = entity.getContent();
               FileOutputStream fileOutputStream = null;
               if (is != null) {
                  File file = new File(
                        Environment.getExternalStorageDirectory(),
                        "Test.apk");
                  fileOutputStream = new FileOutputStream(file);
                        byte[] buf = new byte[10];   
                  int ch = -1;
                  int process = 0;
                  while ((ch = is.read(buf)) != -1) {       
                     fileOutputStream.write(buf, 0, ch);
                     process += ch;
                     progressDialog.setProgress(process);
                  }
               }
               fileOutputStream.flush();
               if (fileOutputStream != null) {
                  fileOutputStream.close();
               }
               down();
            } catch (ClientProtocolException e) {
               e.printStackTrace();
            } catch (IOException e) {
               e.printStackTrace();
            }
         }

      }.start();

而PHP的实现代码是download中的

ob_clean();
flush();
readfile($file);

至于底层的原理是，readfile方法封装了，http文件传输的基本实现，大家可以百度下，以上两段代码配合，一个客户端，一个服务器，就能够实现基于http文件的传输.

import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

import com.example.administrator.dongzhiwuapp.R;

public class SetActivity extends Activity {

   private UpdateInfo info;
   private ProgressDialog progressDialog;//下载进度条窗口
   UpdateInfoService updateInfoService;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.update);
        Button button=(Button)findViewById(R.id.button1);
       button.setOnClickListener(new OnClickListener() {
         @Override
         public void onClick(View v) {
            checkUpdate();
         }
      });
   }



   private void checkUpdate(){
      new Thread() {
         public void run() {
            try {
               updateInfoService = new UpdateInfoService(SetActivity.this);
               info = updateInfoService.getUpDateInfo();
               handler1.sendEmptyMessage(0);
            } catch (Exception e) {
               e.printStackTrace();
            }
         };
      }.start();
   }
   
   @SuppressLint("HandlerLeak")
   private Handler handler1 = new Handler() {
      public void handleMessage(Message msg) {
         if (updateInfoService.isNeedUpdate()) {
            showUpdateDialog();
         }
      }
   };

   private void showUpdateDialog() {
      AlertDialog.Builder builder = new AlertDialog.Builder(this);
      builder.setIcon(android.R.drawable.ic_dialog_info);
      builder.setTitle("请升级APP版本至" + info.getVersion());
      builder.setMessage(info.getDescription());
      builder.setCancelable(false);
      builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
         @Override
         public void onClick(DialogInterface dialog, int which) {
            if (Environment.getExternalStorageState().equals(
                  Environment.MEDIA_MOUNTED)) {
               downFile(info.getUrl());
            } else {
               Toast.makeText(SetActivity.this, "SD卡不可用，请插入SD卡",
                     Toast.LENGTH_SHORT).show();
            }
         }
      });
      builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
         @Override
         public void onClick(DialogInterface dialog, int which) {
         }
      });
      builder.create().show();
   }


   //进入下载
   void downFile(final String url) { 
      progressDialog = new ProgressDialog(SetActivity.this);
      progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
      progressDialog.setTitle("正在下载");
      progressDialog.setMessage("请稍后...");
      progressDialog.setProgress(0);
      progressDialog.show();
      updateInfoService.downLoadFile(url, progressDialog,handler1);
   }
   
}

/**
 * 获取服务器地址
 */

public class GetServerUrl{
   static String url="http://";
         
   public static String getUrl() {
      return url;
   }
}

/*
*
*  版本更新信息类
*  1、获取版本字符串信息
*  2、设置版本字符串信息
*  3、获取版本描述
*  4、设置版本描述
*  5、获取URL地址
*  6、设置URL地址
* */

public class UpdateInfo
{
        private String version;
        private String description;
        private String url;
        
        public String getVersion()
        {
                return version;
        }
        public void setVersion(String version)
        {
                this.version = version;
        }
        public String getDescription()
        {
                return description;
        }
        public void setDescription(String description)
        {
                this.description = description;
        }
        public String getUrl()
        {
                return url;
        }
        public void setUrl(String url)
        {
                this.url = url;
        }
        
}

import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.util.Log;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONObject;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class UpdateInfoService {
   ProgressDialog progressDialog;
   Handler handler;
   Context context;
   UpdateInfo updateInfo;
   
   public UpdateInfoService(Context context){
      this.context=context;
   }


   /*
   * 获取更新信息
   * 版本信息存储在服务器的update.txt文件中
   * 更新信息包括:
   * 1、版本信息
   * 2、最新版本具体描述
   * 3、下载地址
   *
   * */
   public UpdateInfo getUpDateInfo() throws Exception {
      HttpClient httpClient = new DefaultHttpClient();
      HttpGet httpGet = new HttpGet("http://localhost/index.php/API/Server/updateInfo");

      HttpResponse httpResponse = httpClient.execute(httpGet);
      UpdateInfo updateInfo = new UpdateInfo();
      if (httpResponse.getStatusLine().getStatusCode() == 200)//请求相应成功
      {
         HttpEntity entity = httpResponse.getEntity();
         String response = EntityUtils.toString(entity, "utf-8");
         JSONObject jsonObject=new JSONObject(response);

         Log.d("dsdsada", "getUpDateInfo: "+response);
         updateInfo.setVersion(jsonObject.getString("version"));
         updateInfo.setDescription(jsonObject.getString("description"));
         updateInfo.setUrl(jsonObject.getString("url"));
         this.updateInfo = updateInfo;
         return updateInfo;
      }
      updateInfo.setVersion("");
      updateInfo.setDescription("");
      updateInfo.setUrl("");
      this.updateInfo = updateInfo;

      return updateInfo;
   }

   /*
    *判断是否需要更新
    */
   public boolean isNeedUpdate(){
         String new_version = updateInfo.getVersion();
         String now_version="";
         try {
            PackageManager packageManager = context.getPackageManager();
            PackageInfo packageInfo = packageManager.getPackageInfo(
                  context.getPackageName(), 0);
            now_version= packageInfo.versionName;
         } catch (NameNotFoundException e) {
            e.printStackTrace();
         }
         if (new_version.equals(now_version)) {
            return false;
         } else {
            return true;
         }
   }

   /*
   *
   * 下载文件
   * */
   public void downLoadFile(final String url,final ProgressDialog pDialog,Handler h){
      progressDialog=pDialog;
      handler=h;
      new Thread() {
         public void run() {        
            HttpClient client = new DefaultHttpClient();
            HttpGet get = new HttpGet(url);
            HttpResponse response;
            try {
               response = client.execute(get);
               HttpEntity entity = response.getEntity();
               int length = (int) entity.getContentLength();
                                        progressDialog.setMax(length);
               InputStream is = entity.getContent();
               FileOutputStream fileOutputStream = null;
               if (is != null) {
                  File file = new File(
                        Environment.getExternalStorageDirectory(),
                        "Test.apk");
                  fileOutputStream = new FileOutputStream(file);
                        byte[] buf = new byte[10];   
                  int ch = -1;
                  int process = 0;
                  while ((ch = is.read(buf)) != -1) {       
                     fileOutputStream.write(buf, 0, ch);
                     process += ch;
                     progressDialog.setProgress(process);
                  }
               }
               fileOutputStream.flush();
               if (fileOutputStream != null) {
                  fileOutputStream.close();
               }
               down();
            } catch (ClientProtocolException e) {
               e.printStackTrace();
            } catch (IOException e) {
               e.printStackTrace();
            }
         }

      }.start();
   }


   //下载完毕，退出下载，进入安装APP步骤
   void down() {
      handler.post(new Runnable() {
         public void run() {
            progressDialog.cancel();
            update();
         }
      });
   }


   //安装最新版本APP
   void update() {
      Intent intent = new Intent(Intent.ACTION_VIEW);
      intent.setDataAndType(Uri.fromFile(new File(Environment
            .getExternalStorageDirectory(), "Test.apk")),
            "application/vnd.android.package-archive");
      context.startActivity(intent);
   }

   
}