apk更新、下载、安装（四）---DownloadManager ui方式

<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"
tools:context="com.example.demo.MainActivity" >

<Button
android:id="@+id/mBut_download"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView1"
android:layout_alignParentTop="true"
android:layout_marginLeft="30dp"
android:text="Button" />

</RelativeLayout>

package com.example.demo;

import java.io.File;

import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.Activity;
import android.app.DownloadManager;
import android.app.DownloadManager.Request;
import android.content.Context;
import android.content.SharedPreferences;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {

private Button mBut_download;

@Override
protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

mBut_download = (Button) findViewById(R.id.mBut_download);

mBut_download.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
intoDownloadManager();

}

});

}

private boolean isFolderExist(String dir) {
File folder = Environment.getExternalStoragePublicDirectory(dir);
return (folder.exists() && folder.isDirectory()) ? true : folder
.mkdirs();
}

@SuppressLint("NewApi")
@TargetApi(Build.VERSION_CODES.GINGERBREAD)
private void intoDownloadManager() {

DownloadManager dManager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);

Uri uri = Uri
.parse("http://dingphone.ufile.ucloud.com.cn/apk/guanwang/time2plato.apk");

final String EXTERNAL_DIR = "download";
boolean folderExist = isFolderExist(EXTERNAL_DIR);

Request request = new Request(uri);

// 表示设置下载地址为sd卡的download文件夹，文件名为time2plato.apk。

if (folderExist) {
request.setDestinationInExternalPublicDir("download",
"time2plato.apk");
}

request.setDescription("柏拉图新版本下载");

request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);

request.setMimeType("application/vnd.android.package-archive");

// 设置为可被媒体扫描器找到

request.allowScanningByMediaScanner();

// 设置为可见和可管理

request.setVisibleInDownloadsUi(true);

long refernece = dManager.enqueue(request);

// 把当前下载的ID保存起来

SharedPreferences sPreferences = getSharedPreferences("downloadplato",
0);

sPreferences.edit().putLong("plato", refernece).commit();

}

}

package com.example.demo;

import android.annotation.SuppressLint;
import android.app.DownloadManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.Uri;

public class DownLoadBroadcastReceiver extends BroadcastReceiver {

@SuppressLint("NewApi")
public void onReceive(Context context, Intent intent) {

long myDwonloadID = intent.getLongExtra(
DownloadManager.EXTRA_DOWNLOAD_ID, -1);

SharedPreferences sPreferences = context.getSharedPreferences(
"downloadplato", 0);

long refernece = sPreferences.getLong("plato", 0);

if (refernece == myDwonloadID) {

String serviceString = Context.DOWNLOAD_SERVICE;

DownloadManager dManager = (DownloadManager) context
.getSystemService(serviceString);

Intent install = new Intent(Intent.ACTION_VIEW);

Uri downloadFileUri = dManager
.getUriForDownloadedFile(myDwonloadID);

install.setDataAndType(downloadFileUri,
"application/vnd.android.package-archive");

install.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

context.startActivity(install);
}

}

}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.demo"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="18"
android:targetSdkVersion="18" />

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

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

<receiver android:name="com.example.demo.DownLoadBroadcastReceiver" >
<intent-filter>
<action android:name="android.intent.action.DOWNLOAD_COMPLETE" />
</intent-filter>
</receiver>
</application>

</manifest>