Android开发之文件下载(通知栏中显示进度条，状态信息等)

Android开发之文件下载(通知栏中显示进度条，状态信息等)

文件下载一直都是开发者开发过程中不可或缺的一个环节，前几天下载文件，发现在通知栏显示下载进度的效果非常炫酷，本人热衷于研究，故经一番研究后，终于实现了其基本的效果，现将代码贴出，望各位大神批评指正，灰常感谢♪(^∇^*)
本人模拟的是下载携程旅行的apk文件，并且下载完自动跳转到安装目录的Demo，我们废话少说，直接贴代码吧！
先上效果图：

核心代码： MainActivity

package com.hxht.testdownloadapk;

import android.app.Notification;
import android.app.NotificationManager;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.RemoteViews;
import android.widget.Toast;

import net.tsz.afinal.FinalHttp;
import net.tsz.afinal.http.AjaxCallBack;

import java.io.File;

public class MainActivity extends AppCompatActivity {

private String url;
    private String fileSavePath;
    private NotificationManager manager;
    private Notification mNotification;
    private static final int pushId = 1;

    @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initData();
    }

/**
 * 设置数据
 */
 private void initData() {
        url = "http://www.apk.anzhi.com/data3/apk/201509/08/1c7406573baafcff69ddb4fbd3e444d3_08425600.apk";
        fileSavePath = Environment.getExternalStorageDirectory().getPath() + "/cuibo2B.apk";

        manager = (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);
        mNotification = new Notification(R.drawable.icon02, "新版本版本来袭，速速下载吧", System.currentTimeMillis());
        mNotification.contentView = new RemoteViews("com.hxht.testdownloadapk", R.layout.activity_update_message);
        mNotification.flags = Notification.FLAG_NO_CLEAR;
        //mNotification.defaults = Notification.DEFAULT_ALL ;
    }

/**
 * 按钮点击事件
 *
 * @param view
 */
 public void BeginDownloadApk(View view) {
        FinalHttp mFinalHttp = new FinalHttp();
        File file = new File(fileSavePath);
        if (file.exists()) {
            file.delete();
        }
        mFinalHttp.download(url, fileSavePath, new AjaxCallBack<File>() {

/**
 * 正在下载
 * @param count
 * @param current
 */
 @Override
public void onLoading(long count, long current) {
super.onLoading(count, current);

                int progress = (int) (current * 1.0f / count * 100);
                if (progress % 5 == 0) {
                    mNotification.contentView.setTextViewText(R.id.tv_desc, "正在下载中.");
                } else if (progress % 5 == 1) {
                    mNotification.contentView.setTextViewText(R.id.tv_desc, "正在下载中..");
                } else if (progress % 5 == 2) {
                    mNotification.contentView.setTextViewText(R.id.tv_desc, "正在下载中...");
                } else if (progress % 5 == 3) {
                    mNotification.contentView.setTextViewText(R.id.tv_desc, "正在下载中....");
                } else if (progress % 5 == 4) {
                    mNotification.contentView.setTextViewText(R.id.tv_desc, "正在下载中.....");
                }

                mNotification.contentView.setTextViewText(R.id.tv_progress, progress + "/100");
                mNotification.contentView.setProgressBar(R.id.pb, 100, progress, false);

                manager.notify(pushId, mNotification);
            }

/**
 * 下载成功
 * @param file
 */
 @Override
public void onSuccess(File file) {
super.onSuccess(file);
                Toast.makeText(MainActivity.this, "下载成功,文件保存在了" + fileSavePath + "路径下", Toast.LENGTH_SHORT).show();
                mNotification.flags = Notification.FLAG_AUTO_CANCEL;
                mNotification.contentView.setTextViewText(R.id.tv_desc, "下载成功");
                mNotification.contentView.setTextViewText(R.id.tv_progress, "");
                mNotification.contentView.setProgressBar(R.id.pb, 100, 100, false);
                manager.notify(pushId, mNotification);

                installAPK(file);
            }

/**
 * 下载失败
 * @param t
 * @param strMsg
 */
 @Override
public void onFailure(Throwable t, String strMsg) {
super.onFailure(t, strMsg);
                Toast.makeText(MainActivity.this, "下载失败", Toast.LENGTH_SHORT).show();
                mNotification.flags = Notification.FLAG_AUTO_CANCEL;
                mNotification.contentView.setTextViewText(R.id.tv_desc, "下载失败,连接服务器中...");
                mNotification.contentView.setTextViewText(R.id.tv_progress, "");
                mNotification.contentView.setProgressBar(R.id.pb, 100, 100, true);
                manager.notify(pushId, mNotification);
            }
        });
    }

private void installAPK(File file) {
        Intent intent = new Intent();
        intent.setAction("android.intent.action.VIEW");
        intent.addCategory("android.intent.category.DEFAULT");
        intent.setDataAndType(Uri.fromFile(file),
                "application/vnd.android.package-archive");
        intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        startActivity(intent);
    }
}

代码已贴出，正所谓取之于社会，回报于社会，望各路大神批评指正，不喜勿喷，灰常感谢♪(^∇^*)！！！