Android自动更新代码

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

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 android.app.AlertDialog;

import android.app.Dialog;

import android.app.ProgressDialog;

import android.content.DialogInterface;

import android.content.Intent;

import android.net.Uri;

import android.os.Bundle;

import android.os.Environment;

import android.os.Handler;

  

public class Update extends BaseActivity {

    public ProgressDialog pBar;

    private Handler handler = new Handler();

  

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.update);

        Dialog dialog = new AlertDialog.Builder(Update.this)

                .setTitle("系统更新")

                .setMessage("发现新版本，请更新！")

                // 设置内容

                .setPositiveButton("确定",// 设置确定按钮

                        new DialogInterface.OnClickListener() {

  

                            @Override

                            public void onClick(DialogInterface dialog,

                                    int which) {

                                pBar = new ProgressDialog(Update.this);

                                pBar.setTitle("正在下载");

                                pBar.setMessage("请稍候...");

                                pBar.setProgressStyle(ProgressDialog.STYLE_SPINNER);

                                downFile("http://url:8765/OA.apk");

  

                            }

  

                        })

                .setNegativeButton("取消", new DialogInterface.OnClickListener() {

                    public void onClick(DialogInterface dialog, int whichButton) {

                        // 点击"取消"按钮之后退出程序

  

                    }

                }).create();// 创建

        // 显示对话框

        dialog.show();

  

    }

  

    void downFile(final String url) {

        pBar.show();

        new Thread() {

            public void run() {

                HttpClient client = new DefaultHttpClient();

                // params[0]代表连接的url

                HttpGet get = new HttpGet(url);

                HttpResponse response;

                try {

                    response = client.execute(get);

                    HttpEntity entity = response.getEntity();

                    long length = entity.getContentLength();

                    InputStream is = entity.getContent();

                    FileOutputStream fileOutputStream = null;

                    if (is != null) {

  

                        File file = new File(

                                Environment.getExternalStorageDirectory(),

                                "OA.apk");

                        fileOutputStream = new FileOutputStream(file);

  

                        byte[] buf = new byte[1024];

                        int ch = -1;

                        int count = 0;

                        while ((ch = is.read(buf)) != -1) {

                            // baos.write(buf, 0, ch);

                            fileOutputStream.write(buf, 0, ch);

                            count += ch;

                            if (length > 0) {

  

                            }

  

                        }

  

                    }

                    fileOutputStream.flush();

                    if (fileOutputStream != null) {

                        fileOutputStream.close();

                    }

                    down();

                } catch (ClientProtocolException e) {

                    // TODO Auto-generated catch block

                    e.printStackTrace();

                } catch (IOException e) {

                    // TODO Auto-generated catch block

                    e.printStackTrace();

                }

            }

  

        }.start();

  

    }

  

    void down() {

        handler.post(new Runnable() {

            public void run() {

                pBar.cancel();

                update();

            }

        });

  

    }

  

    void update() {

  

        Intent intent = new Intent(Intent.ACTION_VIEW);

        intent.setDataAndType(Uri.fromFile(new File("/sdcard/OA.apk")),

                "application/vnd.android.package-archive");

        startActivity(intent);

    }

  

}