更改为 flatMap.

Author: xingda920813

sample/src/main/java/com/xdandroid/sample/misc/GenOpsActivity.java

@@ -41,11 +41,9 @@ protected void onCreate(Bundle savedInstanceState) {
                   .filter(i -> (i.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) == 0)
                   .filter(i -> (i.applicationInfo.flags & ApplicationInfo.FLAG_UPDATED_SYSTEM_APP) == 0)
                   .map(i -> i.applicationInfo.packageName)
-                  .map(n -> Stream
+                  .flatMap(n -> Stream
                           .of("WIFI_SCAN", "WAKE_LOCK", "RUN_IN_BACKGROUND", "WRITE_SETTINGS", "SYSTEM_ALERT_WINDOW")
-                          .map(op -> genOp(n, op))
-                          .collect(Collectors.toSet()))
-                  .flatMap(Collection::stream)
+                          .map(op -> genOp(n, op)))
                   .forEach(op -> {
                       try {
                           fos.write(op.getBytes("UTF-8"));