ApkDownloadService.java

package com.yeetou.xinyongkaguanjia.http.service;

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 com.yeetou.xinyongkaguanjia.constants.AppConstant;

import android.os.Handler;
import android.util.Log;

public class ApkDownloadService implements Runnable {

    private static final String TAG = "APK_DOWNLOAD_SERVICE";

    private String downloadUrl = null;

    private Handler mHandler = null;

    public ApkDownloadService(String downloadUrl, Handler hanlder) {
        this.mHandler = hanlder;
        this.downloadUrl = downloadUrl;
    }

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

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

            File file = new File(AppConstant.BASE_DIR_PATH);
            if (!file.exists()) {
                file.mkdir();
            }
            File ApkFile = new File(file, AppConstant.APK_NAME);
            FileOutputStream fos = new FileOutputStream(ApkFile);

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

            do {
                int numread = is.read(buf);
                count += numread;
                int progress = (int)(((float)count / length) * 100);
                // 更新进度
                mHandler.sendMessage(mHandler.obtainMessage(
                		AppConstant.HANDLER_APK_DOWNLOAD_PROGRESS, progress));
                if (numread <= 0) {
                    // 下载完成通知安装
                    mHandler.sendEmptyMessage(AppConstant.HANDLER_APK_DOWNLOAD_FINISH);
                    break;
                }
                fos.write(buf, 0, numread);
            } while (true);

            fos.close();
            is.close();
        } catch (MalformedURLException e) {
            Log.e(TAG, e.getMessage(), e);
        } catch (IOException e) {
            Log.e(TAG, e.getMessage(), e);
        }

    }

}