W/System.err﹕ java.lang.IllegalArgumentException: Unknown URL content://downloads/my_downloads

本文探讨了在Android中遇到的Download Manager禁用导致的UnknownURL错误，并提供了通过设置应用启用状态来重新激活Download Manager的方法。同时，讨论了如何引导用户手动启用此功能。

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异常：W/System.err﹕ java.lang.IllegalArgumentException: Unknown URL content://downloads/my_downloads

原文位置：http://stackoverflow.com/questions/21551538/how-to-enable-android-download-manager

问题描述：

I'm using Android Download Manager to download list of files. Lately I came across a crash report saying

Unknown java.lang.IllegalArgumentException: Unknown URL content://downloads/my_downloads

Then later, I figured it out that the reason is because user disabled Android Download Manager. I check if the Download Manager is disabled by checking it's package name with the code below.

int state = this.getPackageManager().getApplicationEnabledSetting("com.android.providers.downloads");

And now, I need to find a way to enable the Download Manager if it is disabled. I tried setting it's enable state with the permission in Manifest but I keep getting Security Exception.

this.getPackageManager().setApplicationEnabledSetting("com.android.providers.downloads", PackageManager.COMPONENT_ENABLED_STATE_DEFAULT, 0);

<uses-permission android:name="android.permission.CHANGE_COMPONENT_ENABLED_STATE"/>

So I thought it might not be reachable because of it is a system app. (Google Play App does it).

Is there any way to redirect the user to the Download Manager Application Info view ? to let the user enables it ? If there is no way to enable it on run time programmatically.

分析：也就是说，抛出此异常的原因可能是“下载管理器”处于“停用”状态

(待续，)