Android开发之文件下载(通知栏中显示进度条，状态信息等)

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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♪(^∇^*)！！！

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