本文介绍如何利用Android系统提供的DownloadManager组件实现文件下载功能，包括下载进度展示、暂停与继续下载等操作。
琢磨DownloadManager下载文件的时候发现的,正好整理一下,现在文件下载是每个apk必备功能,更行是肯定的.
话不多说,看效果:
ps:网上随便找的一个小apk.
主要核心类两个,一个MainActivity,一个帮助DownloadManagerHelp,
MainActivity代码:
package com.tyxo.downloadmanager;
import java.io.File;
import java.text.DecimalFormat;
import android.app.DownloadManager;
import android.app.DownloadManager.Query;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.database.ContentObserver;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.text.TextUtils;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import com.tyxo.downloadmanager.DownloadManagerHelp;
import com.tyxo.downloadmanager.PreferencesUtils;
import com.tyxo.lib_processbutton.iml.SubmitProcessButton;
/**
* DownloadManagerDemo
*/
public class MainActivity extends BaseActivity {
public static final String DOWNLOAD_FILE_NAME = "Tyxo.apk";
public static final String APK_URL = "http://125.39.109.30/apk.r1.market.hiapk.com/data/upload/apkres/2016/4_5/16/com.hiapk.live_044405.apk";
// http://125.39.109.30/apk.r1.market.hiapk.com/data/upload/apkres/2016/4_5/16/com.hiapk.live_044405.apk?wsiphost=local
public static final String KEY_NAME_DOWNLOAD_ID = "downloadId";
private Button downloadButton;
private ProgressBar downloadProgress;
private TextView downloadTip;
private TextView downloadSize;
private TextView downloadPrecent;
private Button downloadCancel;
private DownloadManager downloadManager;
private DownloadManagerHelp downloadManagerPro;
private long downloadId = 0;
private MyHandler handler;
private DownloadChangeObserver downloadObserver;
private CompleteReceiver completeReceiver;
private SubmitProcessButton btn_SubmitProcessButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState, R.layout.download_manager_demo);
handler = new MyHandler();
downloadManager = (DownloadManager)getSystemService(DOWNLOAD_SERVICE);
downloadManagerPro = new DownloadManagerHelp(downloadManager);
// see android mainfest.xml, accept minetype of cn.trinea.download.file
Intent intent = getIntent();
if (intent != null) {
Uri data = intent.getData();
if (data != null) {
Toast.makeText(context, data.toString(), Toast.LENGTH_LONG).show();
}
}
initView();
initData();
downloadObserver = new DownloadChangeObserver();
completeReceiver = new CompleteReceiver();
/** register download success broadcast **/
registerReceiver(completeReceiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
}
@Override
protected void onResume() {
super.onResume();
/** observer download change **/
getContentResolver().registerContentObserver(DownloadManagerHelp.CONTENT_URI, true, downloadObserver);
updateView();
}
@Override
protected void onPause() {
super.onPause();
getContentResolver().unregisterContentObserver(downloadObserver);
}
@Override
protected void onDestroy() {
super.onDestroy();
unregisterReceiver(completeReceiver);
}
private void initView() {
btn_SubmitProcessButton = (SubmitProcessButton) findViewById(R.id.btn_SubmitProcessButton);
downloadButton = (Button)findViewById(R.id.download_button);
downloadCancel = (Button)findViewById(R.id.download_cancel);
downloadProgress = (ProgressBar)findViewById(R.id.download_progress);
downloadTip = (TextView)findViewById(R.id.download_tip);
downloadTip.setText(getString(R.string.tip_download_file)
+ Environment.getExternalStoragePublicDirectory("tyxo"));
downloadSize = (TextView)findViewById(R.id.download_size);
downloadPrecent = (TextView)findViewById(R.id.download_precent);
}
private int mProgress;
final Handler HandlerSub = new Handler();
private Runnable runnable = new Runnable() {
@Override
public void run() {
mProgress += 10;
btn_SubmitProcessButton.setProgress(mProgress);
if (mProgress < 100) {
HandlerSub.postDelayed(this, 200);
} else {
Toast.makeText(getApplicationContext(), "下载完成", 0).show();
}
}
};
private void initData() {
btn_SubmitProcessButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
HandlerSub.postDelayed(runnable, 500);
btn_SubmitProcessButton.setEnabled(false);
}
});
/**
* get download id from preferences.<br/>
* if download id bigger than 0, means it has been downloaded, then query status and show right text;
*/
downloadId = PreferencesUtils.getLong(context, KEY_NAME_DOWNLOAD_ID);
updateView();
downloadButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
File folder = Environment.getExternalStoragePublicDirectory("tyxo");
if (!folder.exists() || !folder.isDirectory()) {
folder.mkdirs();
}
DownloadManager.Request request = new DownloadManager.Request(Uri.parse(APK_URL));
// request.setDestinationInExternalPublicDir(DOWNLOAD_FOLDER_NAME, DOWNLOAD_FILE_NAME); // 此方法,有的手机装TF卡,会蹦
request.setDestinationInExternalFilesDir(context, "tyxo", DOWNLOAD_FILE_NAME);
request.setTitle(getString(R.string.download_notification_title));
request.setDescription("some desc");
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
request.setVisibleInDownloadsUi(false);
// request.allowScanningByMediaScanner();
// request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI);
// request.setShowRunningNotification(false);
// request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_HIDDEN);
request.setMimeType("application/cn.tyxo.download.file");
downloadId = downloadManager.enqueue(request);
// save download id to preferences
PreferencesUtils.putLong(context, KEY_NAME_DOWNLOAD_ID, downloadId);
updateView();
}
});
downloadCancel.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
downloadManager.remove(downloadId);
updateView();
}
});
}
/**
* install app
*/
public static boolean install(Context context, String filePath) {
Intent i = new Intent(Intent.ACTION_VIEW);
File file = new File(filePath);
if (file != null && file.length() > 0 && file.exists() && file.isFile()) {
i.setDataAndType(Uri.parse("file://" + filePath), "application/vnd.android.package-archive");
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(i);
return true;
}
return false;
}
class DownloadChangeObserver extends ContentObserver {
public DownloadChangeObserver() {
super(handler);
}
@Override
public void onChange(boolean selfChange) {
updateView();
}
}
// 下载完成,自动弹出安装
class CompleteReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
/**
* get the id of download which have download success, if the id is my id and it's status is successful,
* then install it
**/
String action = intent.getAction();
long completeDownloadId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);
long downloadID = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);
String apkFilePath = querySavePath(downloadID,downloadManager);
if (completeDownloadId == downloadId) {
initData();
updateView();
// if download successful, install apk
/*if (downloadManagerPro.getStatusById(downloadId) == DownloadManager.STATUS_SUCCESSFUL) {
String apkFilePath = new StringBuilder(Environment.getExternalStorageDirectory().getAbsolutePath())
.append(File.separator).append("tyxo").append(File.separator)
.append(DOWNLOAD_FILE_NAME).toString();
install(context, apkFilePath);
}*/
if (DownloadManager.ACTION_DOWNLOAD_COMPLETE.equals(action)) {
installAPK(apkFilePath);
}
}
}
};
private void installAPK(String apkFilePath){
if (!TextUtils.isEmpty(apkFilePath)) {
Uri uri = Uri.parse(apkFilePath);
File file = new File(uri.getPath());
if (file.exists()) {
Intent i = new Intent(Intent.ACTION_VIEW);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
i.setDataAndType(uri, "application/vnd.android.package-archive");
context.startActivity(i);
}
}
}
/**
* 根据下载ID查询下载文件保存的路径
* @param @param downloadManager
* @return
*/
public static String querySavePath(long downloadID, DownloadManager downloadManager) {
String savePath = "";
Query query = new Query();
query.setFilterById(downloadID);
Cursor c = downloadManager.query(query);
if (c.moveToFirst()) {
int columnIndex = c.getColumnIndex(DownloadManager.COLUMN_STATUS);
if (DownloadManager.STATUS_SUCCESSFUL == c.getInt(columnIndex)) {
savePath = c.getString(c.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI));
}
}
c.close();
return savePath;
}
// 发消息,更新UI视图
public void updateView() {
int[] bytesAndStatus = downloadManagerPro.getBytesAndStatus(downloadId);
handler.sendMessage(handler.obtainMessage(0, bytesAndStatus[0], bytesAndStatus[1], bytesAndStatus[2]));
}
// 处理消息,更新UI视图
private class MyHandler extends Handler {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case 0:
int status = (Integer)msg.obj;
if (isDownloading(status)) {
downloadProgress.setVisibility(View.VISIBLE);
downloadProgress.setMax(0);
downloadProgress.setProgress(0);
btn_SubmitProcessButton.setProgress(0);
downloadButton.setVisibility(View.GONE);
downloadSize.setVisibility(View.VISIBLE);
downloadPrecent.setVisibility(View.VISIBLE);
downloadCancel.setVisibility(View.VISIBLE);
if (msg.arg2 < 0) {
downloadProgress.setIndeterminate(true);
downloadPrecent.setText("0%");
downloadSize.setText("0M/0M");
} else {
downloadProgress.setIndeterminate(false);
downloadProgress.setMax(msg.arg2);
downloadProgress.setProgress(msg.arg1);
btn_SubmitProcessButton.setProgress(switchPercent(msg.arg1, msg.arg2));
downloadPrecent.setText(getNotiPercent(msg.arg1, msg.arg2));
downloadSize.setText(getAppSize(msg.arg1) + "/" + getAppSize(msg.arg2));
}
} else {
downloadProgress.setVisibility(View.GONE);
downloadProgress.setMax(0);
downloadProgress.setProgress(0);
btn_SubmitProcessButton.setProgress(0);
downloadButton.setVisibility(View.VISIBLE);
downloadSize.setVisibility(View.GONE);
downloadPrecent.setVisibility(View.GONE);
downloadCancel.setVisibility(View.GONE);
if (status == DownloadManager.STATUS_FAILED) {
downloadButton.setText(getString(R.string.app_status_download_fail));
} else if (status == DownloadManager.STATUS_SUCCESSFUL) {
downloadButton.setText(getString(R.string.app_status_downloaded));
} else {
downloadButton.setText(getString(R.string.app_status_download));
}
}
break;
}
}
}
public int switchPercent(long progress, long max) {
int rate = 0;
if (progress <= 0 || max <= 0) {
rate = 0;
} else if (progress > max) {
rate = 100;
} else {
rate = (int)((double)progress / max * 100);
}
if(rate>98){
return rate;
}else {
return rate + 1;
}
}
static final DecimalFormat DOUBLE_DECIMAL_FORMAT = new DecimalFormat("0.##");
public static final int MB_2_BYTE = 1024 * 1024;
public static final int KB_2_BYTE = 1024;
/**
* @param size
*/
public static CharSequence getAppSize(long size) {
if (size <= 0) {
return "0M";
}
if (size >= MB_2_BYTE) {
return new StringBuilder(16).append(DOUBLE_DECIMAL_FORMAT.format((double)size / MB_2_BYTE)).append("M");
} else if (size >= KB_2_BYTE) {
return new StringBuilder(16).append(DOUBLE_DECIMAL_FORMAT.format((double)size / KB_2_BYTE)).append("K");
} else {
return size + "B";
}
}
public static String getNotiPercent(long progress, long max) {
int rate = 0;
if (progress <= 0 || max <= 0) {
rate = 0;
} else if (progress > max) {
rate = 100;
} else {
rate = (int)((double)progress / max * 100);
}
return new StringBuilder(16).append(rate).append("%").toString();
}
public static boolean isDownloading(int downloadManagerStatus) {
return downloadManagerStatus == DownloadManager.STATUS_RUNNING
|| downloadManagerStatus == DownloadManager.STATUS_PAUSED
|| downloadManagerStatus == DownloadManager.STATUS_PENDING;
}
}DownloadManagerHelp 代码:
package com.tyxo.downloadmanager;
import java.lang.reflect.Method;
import android.app.DownloadManager;
import android.app.DownloadManager.Request;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
/**
* DownloadManagerPro
*/
public class DownloadManagerHelp {
public static final Uri CONTENT_URI = Uri.parse("content://downloads/my_downloads");
/** represents downloaded file above api 11 **/
public static final String COLUMN_LOCAL_FILENAME = "local_filename";
/** represents downloaded file below api 11 **/
public static final String COLUMN_LOCAL_URI = "local_uri";
public static final String METHOD_NAME_PAUSE_DOWNLOAD = "pauseDownload";
public static final String METHOD_NAME_RESUME_DOWNLOAD = "resumeDownload";
private static boolean isInitPauseDownload = false;
private static boolean isInitResumeDownload = false;
private static Method pauseDownload = null;
private static Method resumeDownload = null;
private DownloadManager downloadManager;
public DownloadManagerHelp(DownloadManager downloadManager) {
this.downloadManager = downloadManager;
}
/**
* get download status
*
* @param downloadId
* @return
*/
public int getStatusById(long downloadId) {
return getInt(downloadId, DownloadManager.COLUMN_STATUS);
}
/**
* get downloaded byte, total byte
*
* @param downloadId
* @return a int array with two elements
* <ul>
* <li>result[0] represents downloaded bytes, This will initially be -1.</li>
* <li>result[1] represents total bytes, This will initially be -1.</li>
* </ul>
*/
public int[] getDownloadBytes(long downloadId) {
int[] bytesAndStatus = getBytesAndStatus(downloadId);
return new int[] {bytesAndStatus[0], bytesAndStatus[1]};
}
/**
* get downloaded byte, total byte and download status
*
* @param downloadId
* @return a int array with three elements
* <ul>
* <li>result[0] represents downloaded bytes, This will initially be -1.</li>
* <li>result[1] represents total bytes, This will initially be -1.</li>
* <li>result[2] represents download status, This will initially be 0.</li>
* </ul>
*/
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 = downloadManager.query(query);
if (c != null && c.moveToFirst()) {
bytesAndStatus[0] = c.getInt(c.getColumnIndexOrThrow(DownloadManager.COLUMN_BYTES_DOWNLOADED_SO_FAR));
bytesAndStatus[1] = c.getInt(c.getColumnIndexOrThrow(DownloadManager.COLUMN_TOTAL_SIZE_BYTES));
bytesAndStatus[2] = c.getInt(c.getColumnIndex(DownloadManager.COLUMN_STATUS));
}
} finally {
if (c != null) {
c.close();
}
}
return bytesAndStatus;
}
/**
* pause download
*
* @param ids the IDs of the downloads to be paused
* @return the number of downloads actually paused, -1 if exception or method not exist
*/
public int pauseDownload(long... ids) {
initPauseMethod();
if (pauseDownload == null) {
return -1;
}
try {
return ((Integer)pauseDownload.invoke(downloadManager, ids)).intValue();
} catch (Exception e) {
/**
* accept all exception, include ClassNotFoundException, NoSuchMethodException, InvocationTargetException,
* NullPointException
*/
e.printStackTrace();
}
return -1;
}
/**
* resume download
*
* @param ids the IDs of the downloads to be resumed
* @return the number of downloads actually resumed, -1 if exception or method not exist
*/
public int resumeDownload(long... ids) {
initResumeMethod();
if (resumeDownload == null) {
return -1;
}
try {
return ((Integer)resumeDownload.invoke(downloadManager, ids)).intValue();
} catch (Exception e) {
/**
* accept all exception, include ClassNotFoundException, NoSuchMethodException, InvocationTargetException,
* NullPointException
*/
e.printStackTrace();
}
return -1;
}
/**
* whether exist pauseDownload and resumeDownload method in {@link DownloadManager}
*
* @return
*/
public static boolean isExistPauseAndResumeMethod() {
initPauseMethod();
initResumeMethod();
return pauseDownload != null && resumeDownload != null;
}
private static void initPauseMethod() {
if (isInitPauseDownload) {
return;
}
isInitPauseDownload = true;
try {
pauseDownload = DownloadManager.class.getMethod(METHOD_NAME_PAUSE_DOWNLOAD, long[].class);
} catch (Exception e) {
// accept all exception
e.printStackTrace();
}
}
private static void initResumeMethod() {
if (isInitResumeDownload) {
return;
}
isInitResumeDownload = true;
try {
resumeDownload = DownloadManager.class.getMethod(METHOD_NAME_RESUME_DOWNLOAD, long[].class);
} catch (Exception e) {
// accept all exception
e.printStackTrace();
}
}
/**
* get download file name
*
* @param downloadId
* @return
*/
public String getFileName(long downloadId) {
return getString(downloadId, (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB ? COLUMN_LOCAL_URI
: COLUMN_LOCAL_FILENAME));
}
/**
* get download uri
*
* @param downloadId
* @return
*/
public String getUri(long downloadId) {
return getString(downloadId, DownloadManager.COLUMN_URI);
}
/**
* get failed code or paused reason
*
* @param downloadId
* @return <ul>
* <li>if status of downloadId is {@link DownloadManager#STATUS_PAUSED}, return
* {@link #getPausedReason(long)}</li>
* <li>if status of downloadId is {@link DownloadManager#STATUS_FAILED}, return {@link #getErrorCode(long)}</li>
* <li>if status of downloadId is neither {@link DownloadManager#STATUS_PAUSED} nor
* {@link DownloadManager#STATUS_FAILED}, return 0</li>
* </ul>
*/
public int getReason(long downloadId) {
return getInt(downloadId, DownloadManager.COLUMN_REASON);
}
/**
* get paused reason
*
* @param downloadId
* @return <ul>
* <li>if status of downloadId is {@link DownloadManager#STATUS_PAUSED}, return one of
* {@link DownloadManager#PAUSED_WAITING_TO_RETRY}<br/>
* {@link DownloadManager#PAUSED_WAITING_FOR_NETWORK}<br/>
* {@link DownloadManager#PAUSED_QUEUED_FOR_WIFI}<br/>
* {@link DownloadManager#PAUSED_UNKNOWN}</li>
* <li>else return {@link DownloadManager#PAUSED_UNKNOWN}</li>
* </ul>
*/
public int getPausedReason(long downloadId) {
return getInt(downloadId, DownloadManager.COLUMN_REASON);
}
/**
* get failed error code
*
* @param downloadId
* @return one of {@link DownloadManager#ERROR_*}
*/
public int getErrorCode(long downloadId) {
return getInt(downloadId, DownloadManager.COLUMN_REASON);
}
public static class RequestPro extends DownloadManager.Request {
public static final String METHOD_NAME_SET_NOTI_CLASS = "setNotiClass";
public static final String METHOD_NAME_SET_NOTI_EXTRAS = "setNotiExtras";
private static boolean isInitNotiClass = false;
private static boolean isInitNotiExtras = false;
private static Method setNotiClass = null;
private static Method setNotiExtras = null;
/**
* @param uri the HTTP URI to download.
*/
public RequestPro(Uri uri) {
super(uri);
}
/**
* set noti class, only init once
*
* @param className full class name
*/
public void setNotiClass(String className) {
synchronized (this) {
if (!isInitNotiClass) {
isInitNotiClass = true;
try {
setNotiClass = Request.class.getMethod(METHOD_NAME_SET_NOTI_CLASS, CharSequence.class);
} catch (Exception e) {
// accept all exception
e.printStackTrace();
}
}
}
if (setNotiClass != null) {
try {
setNotiClass.invoke(this, className);
} catch (Exception e) {
/**
* accept all exception, include ClassNotFoundException, NoSuchMethodException,
* InvocationTargetException, NullPointException
*/
e.printStackTrace();
}
}
}
/**
* set noti extras, only init once
*
* @param extras
*/
public void setNotiExtras(String extras) {
synchronized (this) {
if (!isInitNotiExtras) {
isInitNotiExtras = true;
try {
setNotiExtras = Request.class.getMethod(METHOD_NAME_SET_NOTI_EXTRAS, CharSequence.class);
} catch (Exception e) {
// accept all exception
e.printStackTrace();
}
}
}
if (setNotiExtras != null) {
try {
setNotiExtras.invoke(this, extras);
} catch (Exception e) {
/**
* accept all exception, include ClassNotFoundException, NoSuchMethodException,
* InvocationTargetException, NullPointException
*/
e.printStackTrace();
}
}
}
}
/**
* get string column
*
* @param downloadId
* @param columnName
* @return
*/
private String getString(long downloadId, String columnName) {
DownloadManager.Query query = new DownloadManager.Query().setFilterById(downloadId);
String result = null;
Cursor c = null;
try {
c = downloadManager.query(query);
if (c != null && c.moveToFirst()) {
result = c.getString(c.getColumnIndex(columnName));
}
} finally {
if (c != null) {
c.close();
}
}
return result;
}
/**
* get int column
*
* @param downloadId
* @param columnName
* @return
*/
private int getInt(long downloadId, String columnName) {
DownloadManager.Query query = new DownloadManager.Query().setFilterById(downloadId);
int result = -1;
Cursor c = null;
try {
c = downloadManager.query(query);
if (c != null && c.moveToFirst()) {
result = c.getInt(c.getColumnIndex(columnName));
}
} finally {
if (c != null) {
c.close();
}
}
return result;
}
}备注一下:
图中,两次下载,第一次只是看效果,没什么实际逻辑;第二次才是链接网络;
demo下载地址 ps:有分的赏个分场,没分的赏个人场
此处附个git大婶的链接 ,就是用他的三方库: 点击打开
我的demo是eclipse完成的,三方效果库里面有lib源码,如果是Android studio 开发,可以直接在build.gradle添加三方库的支持 :
dependencies {
compile 'com.github.dmytrodanylyk.android-process-button:library:1.0.4'
}
之后会附加个百度云的demo地址.有空再补,下班!
差点忘了这补链接的事, 点击打开链接 密码：qcey
ps: 如果以后链接失效,请留言,会及时更正的.
鉴于项目和lib库是分开的,再加一个导入lib库的教程:
首先,as打开downloadmanager文件夹,注意联网,之后,看下图
点击之后选择libprocessbutton库,一直next,
构建完后,看下图,按图标顺序点击,选择Module dependency ---> 会出现libprocessbutton库,选择它,ok.
最后会重新编译,项目就可以跑了.
ps:如果第一遍导入不管用,关闭Android Studio,重新打开,基本就可以了.
坑爹的优快云,整理半天的图给我弄没了,各位想研究导入第三方库找度娘吧.
我再附一个整体调整好的项目,as直接打开就可以跑的:
地址 : 点击打开链接 密码：3vl7
扫一扫
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