- 布局文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.mazaiting.downloadmanagertest.MainActivity">
<Button
android:onClick="downLoad"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="下载"/>
<Button
android:onClick="unDownLoad"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="取消下载"/>
<Button
android:onClick="queryUri"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="查询文件路径"/>
</LinearLayout>
- Activity代码
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
private static final String PATH = "https://www.python.org/ftp/python/2.7.14/python-2.7.14.amd64.msi";
private long mId;
private DownloadManager mDownloadManager;
private DownloadManager.Query mQuery;
private Uri mUri;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
/**
* 下载点击
*/
public void downLoad(View view) {
// 获取DownloadManager对象
mDownloadManager = (DownloadManager) this.getSystemService(DOWNLOAD_SERVICE);
// 创建一个下载请求
DownloadManager.Request request = new DownloadManager.Request(Uri.parse(PATH));
// 设置内存卡保存的文件夹与文件名
// setDestinationUri
// setDestinationInExternalPublicDir
request.setDestinationInExternalPublicDir("DownloadManagerTest", "python.msi");
//设置下载中通知栏提示的标题
request.setTitle("python");
//设置下载中通知栏提示的介绍
request.setDescription("python desc");
// 设置通知是否显示
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
// 通过setAllowedNetworkTypes方法可以设置允许在何种网络下下载，
// 也可以使用setAllowedOverRoaming方法，它更加灵活
request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI);
// 文件类型
request.setMimeType("application/zip");
// 执行下载，返回downloadId，downloadId可用于后面查询下载信息。若网络不满足条件、Sdcard挂载中、超过最大并发数等异常会等待下载，正常则直接下载。
mId = mDownloadManager.enqueue(request);
// 返回移动网络下载的最大值
Long maxBytesOverMobile = DownloadManager.getMaxBytesOverMobile(this);
Log.e(TAG, "downLoad: maxBytesOverMobile ---------" + maxBytesOverMobile);
// 获取建议的移动网络下载的大小
Long recommendedMaxBytesOverMobile = DownloadManager.getRecommendedMaxBytesOverMobile(this);
Log.e(TAG, "downLoad: recommendedMaxBytesOverMobile ---------" + recommendedMaxBytesOverMobile);
}
/**
* 取消下载点击
*/
public void unDownLoad(View view) {
// 删除下载，若下载中取消下载。会同时删除下载文件和记录。
mDownloadManager.remove(mId);
}
/**
* 查询存储地址
*/
public void queryUri(View view) {
// 获取Uri和下载文件
mUri = mDownloadManager.getUriForDownloadedFile(mId);
Log.e(TAG, "queryUri: uri--------" + mUri);
// 创建一个查询对象
mQuery = new DownloadManager.Query().setFilterById(mId);
// 根据查询对象获取一个游标对象
Cursor cursor = mDownloadManager.query(mQuery);
if (null != cursor) {
if (cursor.moveToFirst()) {
// 获取文件路径
String fileUri = cursor.getString(cursor.getColumnIndexOrThrow(DownloadManager.COLUMN_LOCAL_URI));
Log.e(TAG, "queryUri: fileUri ---------" + fileUri);
// 获取下载状态
int status = cursor.getInt(cursor.getColumnIndexOrThrow(DownloadManager.COLUMN_STATUS));
Log.e(TAG, "queryUri: " + status);
switch (status) {
// 空闲等待中
case DownloadManager.STATUS_PENDING:
Log.e(TAG, "queryUri: STATUS_PENDING");
break;
// 暂停中
case DownloadManager.STATUS_PAUSED:
Log.e(TAG, "queryUri: STATUS_PAUSED");
break;
// 正在下载
case DownloadManager.STATUS_RUNNING:
Log.e(TAG, "queryUri: STATUS_RUNNING");
break;
// 下载成功
case DownloadManager.STATUS_SUCCESSFUL:
Log.e(TAG, "queryUri: STATUS_SUCCESSFUL");
break;
// 下载失败
case DownloadManager.STATUS_FAILED:
Log.e(TAG, "queryUri: STATUS_FAILED");
break;
default:
break;
}
}
cursor.close();
}
}
/**
* 获取下载信息
* @param downloadId 下载ID
* @return
*/
public int[] getBytesAndStatus(long downloadId) {
int[] bytesAndStatus = new int[] { -1, -1, 0 };
DownloadManager.Query query = new DownloadManager.Query().setFilterById(downloadId);
Cursor c = null;
try {
c = mDownloadManager.query(query);
if (c != null && c.moveToFirst()) {
// 获取已下载字节数
bytesAndStatus[0] = c.getInt(c.getColumnIndexOrThrow(DownloadManager.COLUMN_BYTES_DOWNLOADED_SO_FAR));
// 获取总字节数
bytesAndStatus[1] = c.getInt(c.getColumnIndexOrThrow(DownloadManager.COLUMN_TOTAL_SIZE_BYTES));
// 获取当前状态
bytesAndStatus[2] = c.getInt(c.getColumnIndex(DownloadManager.COLUMN_STATUS));
}
} finally {
if (c != null) {
c.close();
}
}
return bytesAndStatus;
}
class DownloadStatusObserver extends ContentObserver {
DownloadStatusObserver(Handler handler) {
super(handler);
}
@Override
public void onChange(boolean selfChange) {
int[] bytesAndStatus = getBytesAndStatus(mId);
//当前大小
int currentSize = bytesAndStatus[0];
//总大小
int totalSize = bytesAndStatus[1];
//下载状态
int status = bytesAndStatus[2];
}
}
DownloadStatusObserver observer = new DownloadStatusObserver(new Handler());
@Override
protected void onResume() {
super.onResume();
getContentResolver().registerContentObserver(mUri, true, observer);
}
@Override
protected void onDestroy() {
super.onDestroy();
getContentResolver().unregisterContentObserver(observer);
}
}
