Android DownloadManager的使用

布局文件:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <Button
        android:id="@+id/downloadBtnBegin"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="onClick"
        android:text="开始下载" />
    <Button
        android:id="@+id/downloadBtnStop"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/downloadBtnBegin" 
        android:onClick="onClick"
        android:text="停止下载" />
    <Button
        android:id="@+id/downloadBtnLook"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/downloadBtnStop" 
        android:onClick="onClick"
        android:text="查看下载" />

    <Button
        android:id="@+id/downloadBtnInstall"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/downloadBtnLook"
        android:onClick="onClick"
        android:text="安装下载apk"  />
    <Button
        android:id="@+id/downloadBtnOpen"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/downloadBtnInstall"
        android:onClick="onClick"
        android:text="打开apk"  />

</RelativeLayout>

package com.cn.demoandroiddownloadmanager;

import java.io.File;

import android.annotation.SuppressLint;
import android.app.DownloadManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity{
    private String TAG = MainActivity.class.getSimpleName();
    private String urlString = "http://gdown.baidu.com/data/wisegame/b7d7e4efd8199dea/tianyiyuedu_310.apk";
    private DownloadManager downloadManager;
    long reference = 0L;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_main);

        downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
    }

    public void onClick(View view){
        int id = view.getId();
        switch (id) {
        case R.id.downloadBtnBegin:
            beginDownLoad();
            break;
        case R.id.downloadBtnStop:
            //注意参数可以是多个，也就是可以remove多个下载任务
            downloadManager.remove(reference);
            break;
        case R.id.downloadBtnLook:
            queryDownloadStatus(reference);
            break;
        case R.id.downloadBtnInstall:
            installApk();
            break;
        case R.id.downloadBtnOpen:
            openApk(urlString);
            break;
        }
    }

    private void openApk(String url) {
        PackageManager manager = getPackageManager();
        // 这里的是你下载好的文件路径
        PackageInfo info = manager.getPackageArchiveInfo(getFile(url).getPath(), PackageManager.GET_ACTIVITIES);
        if (info != null) {
            Intent intent = manager.getLaunchIntentForPackage(info.applicationInfo.packageName);
            startActivity(intent);
        }

    }

    /**
     * 生成文件
     * <p>{@link #getFileName(String)}</p>
     * @param url
     * @return
     */
    private File getFile(String url) {
        File files = new File(Environment.getExternalStorageDirectory().getAbsoluteFile(), getFileName(url));
        return files;
    }

    /**
     * 截取出url后面的apk的文件名
     * @param url
     * @return
     */
    private String getFileName(String url) {
        return url.substring(url.lastIndexOf("/"), url.length());
    }

    protected void installApk() {
        String fileName = "";
        DownloadManager.Query query = new DownloadManager.Query();
        //设置过滤状态
        query.setFilterByStatus(DownloadManager.STATUS_SUCCESSFUL);
        //查询以前下载过的“成功文件”
        Cursor c = downloadManager.query(query);
        if (c.moveToFirst()) {
            fileName = c.getString(c.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI));
        }
        System.out.println("==============文件名============"+fileName);
        // TODO 下载完成后安装
        Intent intent = new Intent(Intent.ACTION_VIEW);
        File file = new File(fileName.replace("file://", ""));  //"/download/downtest.apk"
        intent.setDataAndType(Uri.fromFile(file),
                "application/vnd.android.package-archive");
        startActivity(intent);
    }

    /**
     * {@link #beginDownLoad()}
     * @throws IllegalAccessException
     */
    @SuppressWarnings("unused")
    private void handleException() throws IllegalAccessException{
        throw new IllegalAccessException("ces");
    }

    @SuppressLint("NewApi")
    protected void beginDownLoad() {
        // 创建下载请求
        DownloadManager.Request down = new DownloadManager.Request(
                Uri.parse(urlString));
        // 设置允许使用的网络类型，这里是移动网络和wifi都可以
        down.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_MOBILE
                | DownloadManager.Request.NETWORK_WIFI);
        //在通知栏中显示   
        down.setNotificationVisibility(View.VISIBLE);
        // 显示下载界面
        down.setVisibleInDownloadsUi(true);
        // 设置下载后文件存放的位置，该位置下只能使用root explore打开。
//      down.setDestinationInExternalFilesDir(MainActivity.this, null,"downtest.png");
        // sdcard的目录下的download文件夹
        down.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, getFileName(urlString));
        //在通知栏里显示
        down.setTitle("apk_title");
        down.setDescription("apk_description");
        //在这里返回的reference变量是系统为当前的下载请求分配的一个唯一的ID，
        //我们可以通过这个ID重新获得这个下载任务，进行一些自己想要进行的操作或者
        //查询下载的状态以及取消下载等等。
        reference = downloadManager.enqueue(down);
        // 将下载请求放入队列
        //queryDownloadStatus();
    }

    private void queryDownloadStatus(Long id) {   
        DownloadManager.Query query = new DownloadManager.Query();   
        query.setFilterById(id);   
        Cursor c = downloadManager.query(query);   
        if(c.moveToFirst()) {   
            int status = c.getInt(c.getColumnIndex(DownloadManager.COLUMN_STATUS));   
            switch(status) {   
            case DownloadManager.STATUS_PAUSED:   
                Log.i(TAG, "STATUS_PAUSED");  
            case DownloadManager.STATUS_PENDING:   
                Log.i(TAG, "STATUS_PENDING");  
            case DownloadManager.STATUS_RUNNING:   
                //正在下载，不做任何事情  
                Log.i(TAG, "STATUS_RUNNING");  
                break;   
            case DownloadManager.STATUS_SUCCESSFUL:   
                //完成  
                Log.i(TAG, "下载完成");  
                break;   
            case DownloadManager.STATUS_FAILED:   
                //清除已下载的内容，重新下载  
                Log.i(TAG, "STATUS_FAILED");  
                downloadManager.remove(reference);   
                //该方法返回成功取消的下载的个数，
                //如果一个下载被取消了，所有相关联的文件，部分下载的文件和完全下载的文件都会被删除。
                break;   
            }   
        }  
    }  
    @Override
    protected void onResume() {
        super.onResume();
        registerReceiver(receiver, new IntentFilter(
                DownloadManager.ACTION_DOWNLOAD_COMPLETE));
    }

    public BroadcastReceiver receiver = new BroadcastReceiver() {

        @Override
        public void onReceive(Context context, Intent intent) {
            // TODO Auto-generated method stub
            long downId = intent.getLongExtra(
                    DownloadManager.EXTRA_DOWNLOAD_ID, -1);
            if (intent.getAction().equals(
                    DownloadManager.ACTION_DOWNLOAD_COMPLETE)) {
                Log.v(TAG, " download complete! id : " + downId);
                Toast.makeText(context, "下载完成==>"+"id : " + downId,
                        Toast.LENGTH_SHORT).show();
            }

        }
    };

    protected void onDestroy() {
        if (receiver != null) {
            unregisterReceiver(receiver);
        }
        super.onDestroy();
    };
}

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参考

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