[英]Unsuccessful Download using DownloadManager in Android 9
我的服務器中有一個 xls 文件,需要使用應用程序將其下載到我的手機中。 我正在使用諾基亞 5 和 Android 9 進行測試。 我編譯的sdk版本是29,點擊下載按鈕沒有反應,等了一會兒,彈出“下載不成功”提示。
這是我的 MainActivity.java
public class MainActivity extends AppCompatActivity {
private static final int PERMISSION_STORAGE_CODE = 1000;
EditText editUrl;
Button btnDownload;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
editUrl = findViewById(R.id.edit_url);
btnDownload = findViewById(R.id.btn_download);
btnDownload.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_DENIED) {
String [] permissions = {Manifest.permission.WRITE_EXTERNAL_STORAGE};
requestPermissions(permissions, PERMISSION_STORAGE_CODE);
}
else {
startDownloading();
}
}
else {
startDownloading();
}
}
});
}
private void startDownloading() {
String url = editUrl.getText().toString().trim();
DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI | DownloadManager.Request.NETWORK_MOBILE);
request.setTitle("Download");
request.setDescription("Downloading file...");
request.allowScanningByMediaScanner();
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, ""+System.currentTimeMillis());
DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
manager.enqueue(request);
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
switch(requestCode) {
case PERMISSION_STORAGE_CODE: {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED)
startDownloading();
else
Toast.makeText(this, "Permission Denied", Toast.LENGTH_SHORT).show();
}
}
}
}
我添加了.network_security_config.xml(出於安全原因模糊了域)
<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
<base-config cleartextTrafficPermitted="true" />
<domain-config cleartextTrafficPermitted="true">
<domain includeSubdomains="true">moneytracker.mauini******.com</domain>
</domain-config>
</network-security-config>
並將其添加到清單中
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.main.downloadtest">
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme"
android:networkSecurityConfig="@xml/network_security_config"
android:usesCleartextTraffic="true">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
最后,下載 url 是這樣的:
http://moneytracker.mauini ******.com/uploads/asd.xls
當在瀏覽器中執行 URL 時,文件下載成功。
我錯過了什么嗎? 這些都是我能得到的,搜索了幾天。 請幫忙。
首先,在您的代碼中request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, ""+System.currentTimeMillis());
. 在Environment.DIRECTORY_DOWNLOADS
參數之后,您應該在上面輸入正確的文件名。 coolfilename.xxx
。 或者,獲取其 Uri 值並將Uri.getLastPathSegment()
作為第二個參數。 其次,嘗試放入request.setMimeType(param)
。
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