Android中實現版本更新

package com.workmanager.util;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.net.Uri;
import android.os.Handler;
import android.os.Message;

public class UpdateManager {
    private Context mContext;

    // 提示語
    private String updateMsg = "有最新的軟件包哦，親快下載吧~";

    // 返回你需要安裝的安裝包url
    private String apkUrl = "http://118.24.148.250:8080/yk/update_signed.apk";
    private Dialog noticeDialog;

    private Dialog downloadDialog;
    /* 下載包安裝路徑 */
    private static final String savePath = "/sdcard/updatedemo/";

    private static final String saveFileName = savePath
            + "UpdateDemoRelease.apk";

    /* 進度條與通知ui刷新的handler和msg常量 */
    private ProgressDialog mProgress;

    private static final int DOWN_UPDATE = 1;

    private static final int DOWN_OVER = 2;

    private int progress;

    private Thread downLoadThread;

    private boolean interceptFlag = false;
    private Handler mHandler = new Handler() {
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case DOWN_UPDATE:
                    mProgress.setProgress(progress);
                    break;
                case DOWN_OVER:
                    installApk();
                    break;
                default:
                    break;
            }
        };
    };

    public UpdateManager(Context context) {
        this.mContext = context;
    }

    // 外部接口讓主Activity調用
    public void checkUpdateInfo() {
        showNoticeDialog();
    }

    private void showNoticeDialog() {
        AlertDialog.Builder builder = new Builder(mContext);
        builder.setTitle("軟件版本更新");
        builder.setMessage(updateMsg);
        builder.setPositiveButton("下載", new OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
                showDownloadDialog();
            }
        });
        builder.setNegativeButton("以後再說", new OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
            }
        });
        noticeDialog = builder.create();
        noticeDialog.show();
    }

    private void showDownloadDialog() {
        ProgressDialog dialog = new ProgressDialog(mContext);

        dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

        dialog.setCancelable(false);

        dialog.show();
        new Thread(new DownloadApk(dialog)).start();
    }


    private class DownloadApk implements Runnable {
        private ProgressDialog dialog;
        InputStream is;
        FileOutputStream fos;
        private String TAG;

        public DownloadApk(ProgressDialog dialog) {
            this.dialog = dialog;
        }

        @Override
        public void run() {
            try {
                URL url = new URL(apkUrl);

                HttpURLConnection conn = (HttpURLConnection) url
                        .openConnection();
                conn.connect();
                int length = conn.getContentLength();
                InputStream is = conn.getInputStream();

                File file = new File(savePath);
                if (!file.exists()) {
                    file.mkdir();
                }
                String apkFile = saveFileName;
                File ApkFile = new File(apkFile);
                FileOutputStream fos = new FileOutputStream(ApkFile);

                int count = 0;
                byte buf[] = new byte[1024];

                do {
                    int numread = is.read(buf);
                    count += numread;
                    progress = (int) (((float) count / length) * 100);
                    // 更新進度
                    dialog.setProgress(progress);
                    if (numread <= 0) {
                        // 下載完成通知安裝
                        mHandler.sendEmptyMessage(DOWN_OVER);
                        break;
                    }
                    fos.write(buf, 0, numread);
                } while (!interceptFlag);// 點擊取消就停止下載.

                fos.close();
                is.close();
                dialog.dismiss();
            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }



    private void installApk() {
        File apkfile = new File(saveFileName);
        if (!apkfile.exists()) {
            return;
        }
        Intent i = new Intent(Intent.ACTION_VIEW);
        i.setDataAndType(Uri.parse("file://" + apkfile.toString()),
                "application/vnd.android.package-archive");
        mContext.startActivity(i);

    }
}