Android 6.0 – 外部存储文件在应用卸载时被删除

DownloadManager.request request = new DownloadManager.request(Uri.parse(url));
...
File file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC) + "/Mystuff/song.mp3");
request.setDesTinationUri(Uri.fromFile(filE));

这是通过名为 DownloadReceiver的内部类完成的,并在com.android.providers.downloads package manifest中定义

<receiver android:name=".DownloadReceiver" android:exported="false">
    <intent-filter>
        <action android:name="android.intent.action.bOOT_COMPLETED" />
        <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
        <action android:name="android.intent.action.UID_REMOVED" />
    </intent-filter>
    <intent-filter>
        <action android:name="android.intent.action.MEDIA_MOUNTED" />
        <data android:scheR_545_11845@e="file" />
    </intent-filter>
</receiver>

这里的android.intent.action.UID_REMOVED动作抓住眼睛.它在Lollipop中引入,触发对handleUidRemoved()执行的调用

resolver.delete(all_DOWNLOADS_CONTENT_URI,ConstantS.UID + "=" + uid,null);