Android DownloadManager 无法在智能手机上运行
Android DownloadManager not working on smartphone
目前我正在研究用WebView显示pdf并尝试实现下载功能。我正在使用下载管理器来做到这一点。它适用于下载 pdf 文件的模拟器。然而,在智能手机中,它只显示 'Download 1 task'。几秒钟后,通知消失了,没有下载任何东西。我在 Api 19 及更高版本中实现它。我的智能手机是 android 5.1。这个问题有解决办法吗?
PdfFullscreenActivity.java
public class PdfFullscreenActivity extends AppCompatActivity {
public WebView webview;
public String str;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pdf_fullscreen);
Intent intent = getIntent();
str = intent.getExtras().getString("PDF_TAG");
String url = "https://docs.google.com/viewer?embedded=true&url=https://spmsejarahscore.000webhostapp.com/web/media/pdf/" + str;
webview = (WebView)findViewById(webView);
webview.getSettings().setJavaScriptEnabled(true);
webview.getSettings().setPluginState(WebSettings.PluginState.ON);
webview.getSettings().setBuiltInZoomControls(false);
webview.getSettings().setAllowFileAccess(true);
webview.getSettings().setAppCacheMaxSize(1024 * 1024);
webview.getSettings().setAppCacheEnabled(true);
webview.loadUrl(url);
webview.setWebViewClient(new WebViewClient() {
public void onPageFinished(WebView view, String url) {
}
public boolean shouldOverrideUrlLoading(WebView view, String url) {
return true;
}
});
}
public void onBackPressed(){
super.onBackPressed();
finish();
}
public void download(View v){
// https://spmsejarahscore.000webhostapp.com/web/media/pdf/SijilPelajaranMalaysia(SPM)_2011_P1,2.pdf
String downloadUrl = "https://spmsejarahscore.000webhostapp.com/web/media/pdf/" + str;
Uri urifile = Uri.parse(downloadUrl);
downloadfile(urifile, v);
}
public long downloadfile(Uri uri, View view){
long downloadReference;
DownloadManager downloadManager;
// Create request for android download manager
downloadManager = (DownloadManager)getSystemService(DOWNLOAD_SERVICE);
DownloadManager.Request request = new DownloadManager.Request(uri);
//Setting title of request
request.setTitle("Downloading");
//Setting description of request
request.setDescription(str);
//Set the local destination for the downloaded file to a path within the application's external files directory
request.setDestinationInExternalFilesDir(PdfFullscreenActivity.this, Environment.DIRECTORY_DOWNLOADS, str);
//Enqueue download and save into referenceId
downloadReference = downloadManager.enqueue(request);
return downloadReference;
}
}
activity_pdf_fullscreen.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.foong.spmsejerahscore.PdfFullscreenActivity">
<WebView
android:id="@+id/webView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<ImageButton
android:id="@+id/downloadbtn"
android:layout_width="45dp"
android:layout_height="45dp"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:layout_marginTop="10dp"
android:layout_marginRight="10dp"
android:onClick="download"
android:background="#264745"
android:src="@mipmap/ic_download" />
</RelativeLayout>
添加:
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED)
目前我正在研究用WebView显示pdf并尝试实现下载功能。我正在使用下载管理器来做到这一点。它适用于下载 pdf 文件的模拟器。然而,在智能手机中,它只显示 'Download 1 task'。几秒钟后,通知消失了,没有下载任何东西。我在 Api 19 及更高版本中实现它。我的智能手机是 android 5.1。这个问题有解决办法吗?
PdfFullscreenActivity.java
public class PdfFullscreenActivity extends AppCompatActivity {
public WebView webview;
public String str;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pdf_fullscreen);
Intent intent = getIntent();
str = intent.getExtras().getString("PDF_TAG");
String url = "https://docs.google.com/viewer?embedded=true&url=https://spmsejarahscore.000webhostapp.com/web/media/pdf/" + str;
webview = (WebView)findViewById(webView);
webview.getSettings().setJavaScriptEnabled(true);
webview.getSettings().setPluginState(WebSettings.PluginState.ON);
webview.getSettings().setBuiltInZoomControls(false);
webview.getSettings().setAllowFileAccess(true);
webview.getSettings().setAppCacheMaxSize(1024 * 1024);
webview.getSettings().setAppCacheEnabled(true);
webview.loadUrl(url);
webview.setWebViewClient(new WebViewClient() {
public void onPageFinished(WebView view, String url) {
}
public boolean shouldOverrideUrlLoading(WebView view, String url) {
return true;
}
});
}
public void onBackPressed(){
super.onBackPressed();
finish();
}
public void download(View v){
// https://spmsejarahscore.000webhostapp.com/web/media/pdf/SijilPelajaranMalaysia(SPM)_2011_P1,2.pdf
String downloadUrl = "https://spmsejarahscore.000webhostapp.com/web/media/pdf/" + str;
Uri urifile = Uri.parse(downloadUrl);
downloadfile(urifile, v);
}
public long downloadfile(Uri uri, View view){
long downloadReference;
DownloadManager downloadManager;
// Create request for android download manager
downloadManager = (DownloadManager)getSystemService(DOWNLOAD_SERVICE);
DownloadManager.Request request = new DownloadManager.Request(uri);
//Setting title of request
request.setTitle("Downloading");
//Setting description of request
request.setDescription(str);
//Set the local destination for the downloaded file to a path within the application's external files directory
request.setDestinationInExternalFilesDir(PdfFullscreenActivity.this, Environment.DIRECTORY_DOWNLOADS, str);
//Enqueue download and save into referenceId
downloadReference = downloadManager.enqueue(request);
return downloadReference;
}
}
activity_pdf_fullscreen.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.foong.spmsejerahscore.PdfFullscreenActivity">
<WebView
android:id="@+id/webView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<ImageButton
android:id="@+id/downloadbtn"
android:layout_width="45dp"
android:layout_height="45dp"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:layout_marginTop="10dp"
android:layout_marginRight="10dp"
android:onClick="download"
android:background="#264745"
android:src="@mipmap/ic_download" />
</RelativeLayout>
添加:
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED)