[英]Unsuccessful Download using DownloadManager in Android 9
我的服务器中有一个 xls 文件,需要使用应用程序将其下载到我的手机中。 我正在使用诺基亚 5 和 Android 9 进行测试。 我编译的sdk版本是29,点击下载按钮没有反应,等了一会儿,弹出“下载不成功”提示。
这是我的 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(出于安全原因模糊了域)
<?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>
并将其添加到清单中
<?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,下载 url 是这样的:
http://moneytracker.mauini ******.com/uploads/asd.xls
当在浏览器中执行 URL 时,文件下载成功。
我错过了什么吗? 这些都是我能得到的,搜索了几天。 请帮忙。
首先,在您的代码中request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, ""+System.currentTimeMillis());
. 在Environment.DIRECTORY_DOWNLOADS
参数之后,您应该在上面输入正确的文件名。 coolfilename.xxx
。 或者,获取其 Uri 值并将Uri.getLastPathSegment()
作为第二个参数。 其次,尝试放入request.setMimeType(param)
。
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