本文主要是介绍android 使用download Manager实现应用下载安装，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
android 2.3中引入了download manager ,作为一个service来优化长时间下载操作处理。download manager通过处理http 连接、监听连续的变化和系统重新启动来确保每一次下载都能成功完成。
最好大多数场景下都使用download manager，特别是在一个下载可能会在多个用户回话之间在后台继续进行的地方或者在某个下载的完成非常重要的时候。
1、用到的权限
<uses-permission android:name="android.permission.INTERNET"></uses-permission><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/><uses-permission android:name="android.permission.DOWNLOAD_WITHOUT_NOTIFICATION"/>/*** 下载文件*/private void Download(){String serviceString = Context.DOWNLOAD_SERVICE;downloadManager = (DownloadManager)getSystemService(serviceString);Uri uri = Uri.parse("http://dingphone.ufile.ucloud.com.cn/apk/guanwang/time2plato.apk");//Uri uri = Uri.parse("http://omoml61n3.bkt.clouddn.com/Android%E5%BA%94%E7%94%A8%E6%BA%90%E7%A0%81%E9%9F%B3%E4%B9%90%E5%AE%9E%E6%97%B6%E8%B7%B3%E5%8A%A8%E9%A2%91%E8%B0%B1%E6%98%BE%E7%A4%BA.rar");DownloadManager.Request request = new DownloadManager.Request(uri);//设置下载路径request.setDestinationInExternalPublicDir("download", "time2plato.apk");request.setTitle("标题");request.setDescription("文件下载名设置");//wifi才下载request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI);request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);request.setMimeType("application/vnd.android.package-archive");id = downloadManager.enqueue(request);}IntentFilter filter = new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE);receiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {if (intent.getAction().equals(DownloadManager.ACTION_DOWNLOAD_COMPLETE)) {Receive(intent);openFile(new File("/sdcard/Download/time2plato.apk"));}else if (intent.getAction().equals(DownloadManager.ACTION_NOTIFICATION_CLICKED)){Toast.makeText(getApplication(),"正在下载",Toast.LENGTH_SHORT).show();}}};registerReceiver(receiver,filter);/*** 跳转更新文件* @param file*/private void openFile(File file) {// TODO Auto-generated method stubIntent intent = new Intent();intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);intent.setAction(android.content.Intent.ACTION_VIEW);intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");startActivity(intent);}downloadManager.remove(id); /*** 获取文件下载路径和uri* @param intent*/private void Receive(Intent intent){long reference = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID,-1);DownloadManager.Query mydown = new DownloadManager.Query();mydown.setFilterById(reference);Cursor myDownload = downloadManager.query(mydown);if (myDownload.moveToFirst()){int fileNameIdx = myDownload.getColumnIndex(DownloadManager.COLUMN_LOCAL_FILENAME);int fileUriIdx = myDownload.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI);String fileName = myDownload.getString(fileNameIdx);String fileUri = myDownload.getString(fileUriIdx);tvDown.setText("filename="+fileName+" fileUri="+fileUri);}myDownload.close();}7、获取当前下载状态
/*** 获取当前状态*/private void queryDownloadStatus() {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.e("down", "STATUS_PAUSED");case DownloadManager.STATUS_PENDING:Log.e("down", "STATUS_PENDING");case DownloadManager.STATUS_RUNNING://正在下载，不做任何事情Log.e("down", "STATUS_RUNNING");break;case DownloadManager.STATUS_SUCCESSFUL://完成Log.e("down", "下载完成");break;case DownloadManager.STATUS_FAILED://清除已下载的内容，重新下载Log.e("down", "STATUS_FAILED");break;}}} @Overrideprotected void onDestroy() {if (receiver!=null) {unregisterReceiver(receiver);receiver = null;}super.onDestroy();}package com.example.apple.downloadmanager;import android.app.DownloadManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.database.Cursor;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;import java.io.File;public class MainActivity extends AppCompatActivity {private Button btnDown;private DownloadManager downloadManager;private BroadcastReceiver receiver;private TextView tvDown;private Button btnRemove;private long id;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();}private void initView() {tvDown = (TextView)findViewById(R.id.tv_down);btnDown = (Button)findViewById(R.id.btn_down);btnDown.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Download();//intoDownloadManager();}});IntentFilter filter = new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE);receiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {if (intent.getAction().equals(DownloadManager.ACTION_DOWNLOAD_COMPLETE)) {Receive(intent);openFile(new File("/sdcard/Download/time2plato.apk"));}else if (intent.getAction().equals(DownloadManager.ACTION_NOTIFICATION_CLICKED)){Toast.makeText(getApplication(),"正在下载",Toast.LENGTH_SHORT).show();}}};registerReceiver(receiver,filter);btnRemove = (Button)findViewById(R.id.btn_remove);btnRemove.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// downloadManager.remove(id);queryDownloadStatus();}});}/*** 获取当前状态*/private void queryDownloadStatus() {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.e("down", "STATUS_PAUSED");case DownloadManager.STATUS_PENDING:Log.e("down", "STATUS_PENDING");case DownloadManager.STATUS_RUNNING://正在下载，不做任何事情Log.e("down", "STATUS_RUNNING");break;case DownloadManager.STATUS_SUCCESSFUL://完成Log.e("down", "下载完成");break;case DownloadManager.STATUS_FAILED://清除已下载的内容，重新下载Log.e("down", "STATUS_FAILED");break;}}}/*** 跳转更新文件* @param file*/private void openFile(File file) {// TODO Auto-generated method stubIntent intent = new Intent();intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);intent.setAction(android.content.Intent.ACTION_VIEW);intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");startActivity(intent);}/*** 下载文件*/private void Download(){String serviceString = Context.DOWNLOAD_SERVICE;downloadManager = (DownloadManager)getSystemService(serviceString);Uri uri = Uri.parse("http://dingphone.ufile.ucloud.com.cn/apk/guanwang/time2plato.apk");//Uri uri = Uri.parse("http://omoml61n3.bkt.clouddn.com/Android%E5%BA%94%E7%94%A8%E6%BA%90%E7%A0%81%E9%9F%B3%E4%B9%90%E5%AE%9E%E6%97%B6%E8%B7%B3%E5%8A%A8%E9%A2%91%E8%B0%B1%E6%98%BE%E7%A4%BA.rar");DownloadManager.Request request = new DownloadManager.Request(uri);//设置下载路径request.setDestinationInExternalPublicDir("download", "time2plato.apk");request.setTitle("标题");request.setDescription("文件下载名设置");//wifi才下载request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI);request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);request.setMimeType("application/vnd.android.package-archive");id = downloadManager.enqueue(request);}/*** 获取文件下载路径和uri* @param intent*/private void Receive(Intent intent){long reference = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID,-1);DownloadManager.Query mydown = new DownloadManager.Query();mydown.setFilterById(reference);Cursor myDownload = downloadManager.query(mydown);if (myDownload.moveToFirst()){int fileNameIdx = myDownload.getColumnIndex(DownloadManager.COLUMN_LOCAL_FILENAME);int fileUriIdx = myDownload.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI);String fileName = myDownload.getString(fileNameIdx);String fileUri = myDownload.getString(fileUriIdx);tvDown.setText("filename="+fileName+" fileUri="+fileUri);}myDownload.close();}@Overrideprotected void onDestroy() {if (receiver!=null) {unregisterReceiver(receiver);receiver = null;}super.onDestroy();}
}
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