Android 检测下载自动更新

package com.haoxee.haoxin.login.update;

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.Dialog;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.DialogInterface.OnClickListener;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.Toast;

import com.haoxee.haoxin.R;

/*
 * 检测版本更新
 */
public class UpdateManager {

    private Context mContext;
    private String apkUrl = "";
    private String newVersionNo = "";
    private Dialog noticeDialog;
    private Dialog downloadDialog;
    private static final String savePath = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separatorChar;;
    private static final String saveFileName = savePath + "sxlttxl.apk";
    private ProgressBar 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 _handler;
    private Message msg;

    private Handler mHandler = new Handler() {
        public void handleMessage(Message msg) {
            switch (msg.what) {
            case DOWN_UPDATE:
                mProgress.setProgress(progress);
                break;
            case DOWN_OVER:
                if (downloadDialog != null && downloadDialog.isShowing()) {
                    downloadDialog.dismiss();
                }
                installApk();
                break;
            default:
                break;
            }
        };
    };

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

    public UpdateManager(Context context, String newVersionNo, String clientPath) {
        this.mContext = context;
        this.newVersionNo = newVersionNo;
        this.apkUrl = clientPath;
    }

    public UpdateManager(Context context, String newVersionNo, String clientPath, Handler handler) {
        this.mContext = context;
        this.newVersionNo = newVersionNo;
        this.apkUrl = clientPath;
        this._handler = handler;
    }

    public void checkUpdateInfo(int num) {
        if (7 == num) {
            showNoticeDialog();
        } else {
            showNoticeDialogUpdata();
        }
    }

    private void showNoticeDialog() {
        AlertDialog.Builder builder = new Builder(mContext);
        builder.setTitle(R.string.updatetitle);
        builder.setMessage(R.string.updateMsg);
        builder.setPositiveButton(R.string.down, new OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
                    // sd card 可用
                    dialog.dismiss();
                    showDownloadDialog();
                } else {
                    // 当前不可用
                    Toast.makeText(mContext, "请检查sd卡是否存在", Toast.LENGTH_SHORT).show();
                }
            }
        });
        builder.setNegativeButton(R.string.later, new OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
                Intent intent = new Intent();
                intent.setAction("com.moa.contact.list_v3");
                mContext.startActivity(intent);
            }
        });
        noticeDialog = builder.create();
        noticeDialog.show();
    }

    private void showNoticeDialogUpdata() {
        AlertDialog.Builder builder = new Builder(mContext);
        builder.setTitle(R.string.updatetitle);
        builder.setMessage(R.string.updateMsg);
        builder.setPositiveButton(R.string.down, new OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
                    // sd card 可用
                    dialog.dismiss();
                    showDownloadDialog();
                } else {
                    // 当前不可用
                    Toast.makeText(mContext, "请检查sd卡是否存在", Toast.LENGTH_SHORT).show();
                }
            }
        });
        noticeDialog = builder.create();
        noticeDialog.show();
    }

    private void showDownloadDialog() {
        AlertDialog.Builder builder = new Builder(mContext);
        builder.setTitle(R.string.updatetitle);

        final LayoutInflater inflater = LayoutInflater.from(mContext);
        View v = inflater.inflate(R.layout.progress, null);
        mProgress = (ProgressBar) v.findViewById(R.id.progress);

        builder.setView(v);
        builder.setNegativeButton(R.string.back, new OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
                interceptFlag = true;
            }
        });
        downloadDialog = builder.create();
        downloadDialog.show();

        downloadApk();
    }

    private Runnable mdownApkRunnable = new Runnable() {
        @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[2048];
                do {
                    int numread = is.read(buf);
                    count += numread;
                    progress = (int) (((float) count / length) * 100);
                    mHandler.sendEmptyMessage(DOWN_UPDATE);
                    if (numread <= 0) {
                        mHandler.sendEmptyMessage(DOWN_OVER);
                        break;
                    }
                    fos.write(buf, 0, numread);
                } while (!interceptFlag);

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

        }
    };

    private void downloadApk() {
        downLoadThread = new Thread(mdownApkRunnable);
        downLoadThread.start();
    }

    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);
    }
}