Android之断点续传下载

DBHelper.java

package com.icss.DBHelper;

	import android.content.Context;
	import android.database.sqlite.SQLiteDatabase;
	import android.database.sqlite.SQLiteOpenHelper;

	/**
	* 建立一个数据库帮助类
	*/
	public class DBHelper extends SQLiteOpenHelper {
	        // download.db-->数据库名
	        public DBHelper(Context context) {
	                super(context, "download.db", null, 1);
	        }

	        /**
	         * 在download.db数据库下创建一个download_info表存储下载信息
	         */
	        @Override
	        public void onCreate(SQLiteDatabase db) {
	                db.execSQL("create table download_info(_id integer PRIMARY KEY AUTOINCREMENT, thread_id integer, "
	                                + "start_pos integer, end_pos integer, compelete_size integer,url char)");
	        }

	        @Override
	        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

	        }

	}

下面看主界面的布局,在这里，我只设计了一个ListView来显示下载的音乐的名称，和一个开始下载按钮和一个暂停按钮。 布局文件如下： main.xml：

<?xml version="1.0" encoding="utf-8"?>
	<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	        android:orientation="vertical" android:layout_width="fill_parent"
	        android:layout_height="fill_parent" android:weightSum="1">
	        <ListView android:id="@android:id/list" android:layout_height="wrap_content"
	                android:layout_width="match_parent" android:layout_weight="0.70"></ListView>
	</LinearLayout>

list_item.xml：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	        android:layout_height="fill_parent" android:id="@+id/linearLayout1"
	        android:layout_width="fill_parent" android:orientation="vertical">
	        <LinearLayout android:layout_width="fill_parent"
	                android:id="@+id/linearLayout2" android:layout_height="wrap_content"
	                android:orientation="horizontal" android:layout_marginBottom="5dip">
	                <TextView android:layout_width="fill_parent"
	                        android:layout_height="wrap_content" android:layout_weight="1"
	                        android:id="@+id/tv_resouce_name" />
	                <Button android:layout_width="fill_parent"
	                        android:layout_height="wrap_content" android:layout_weight="1"
	                        android:text="下载" android:id="@+id/btn_start" android:onClick="startDownload" />
	                <Button android:layout_width="fill_parent"
	                        android:layout_height="wrap_content" android:layout_weight="1"
	                        android:text="暂停" android:id="@+id/btn_pause" android:onClick="pauseDownload" />
	        </LinearLayout>
	</LinearLayout>

              

 

 

转载:http://www.adobex.com/android/source/details/00000435.htm