android控件之DowloadManager

package com.lan.www;

import java.io.File;

import android.app.Activity;
import android.app.DownloadManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class DowloadManagerActivity extends Activity {
    /** Called when the activity is first created. */
    TextView tv;
    Button btDel;
    DownloadManager dm;
    long downloadId;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        tv = (TextView) findViewById(R.id.tv);
        btDel = (Button) findViewById(R.id.button2);
        btDel.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {
                // TODO Auto-generated method stub
                //这个方法是变参，可以有多个参数
                dm.remove(downloadId);//删除
            }
        });
        //得到系统的DownloadManager
        dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);

    public void doClick(View v)
    {
        DownloadManager.Request dmReq =
                    //转化成Uri的格式
                new DownloadManager.Request(Uri.parse("http://127.0.0.1:8080/tomServer/file/db.zip"));
        dmReq.setTitle("db.zip");//设置标题
        dmReq.setDescription(" downloading!");//设置工作状态

//禁止发出通知，既后台下载 down.setShowRunningNotification(false);

//不显示下载界面 down.setVisibleInDownloadsUi(false);

//设置下载方式，(这里设置的是3G和WIFI)

dmReq.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_MOBILE|DownloadManager.Request.NETWORK_WIFI);

//dmReqi.setDestinationUri整合了下面两种方法

//dmReq.setDestinationInExternalFilesDir(context, dirType, subPath);//设置下载后文件存放的位置

// dmReq.setDestinationInExternalPublicDir(dirType, subPath); //公共路径

        dmReqi.setDestinationUri(
                Uri.fromFile(new File(
                        //设置公共路径
                        Environment.getExternalStoragePublicDirectory(
                                //设置文件
                                Environment.DIRECTORY_DOWNLOADS
                                ).getAbsoluteFile()
                        +".zip")
                ));
        //放到一个队列里，队列里系统里会给一个Id;
        downloadId = dm.enqueue(dmReq);
        //设置过虑器，用系统给的就可以，可以添加多外过虑器，添加多个用add
        IntentFilter filter = new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE);
        //注册广播
        registerReceiver(thereReceiver, filter);

        tv.setText(tv.getText().toString()+" download started : id = "+downloadId);
    }

    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
        //解除注册广播
        unregisterReceiver(thereReceiver);
    }

    public BroadcastReceiver thereReceiver = new BroadcastReceiver() {

        @Override
        public void onReceive(Context context, Intent intent) {
            // TODO Auto-generated method stub
            Bundle extras = intent.getExtras();
            long doneId = extras.getLong(DownloadManager.EXTRA_DOWNLOAD_ID);
            tv.setText(tv.getText().toString()+" \nfinish "+doneId);
        }
    };
}

android设置配置文件

添加下面两条权限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.INTERNET"/>

2.2以前版本的可能还要添加DownloadManager的使用权限，

补充：移动开发 , Android ,