1. 去掉Settings里截屏菜单条目，packages/apps/Settings：

diff --git a/res/xml/top_level_settings.xml b/res/xml/top_level_settings.xml
old mode 100644
new mode 100755
index a5e4d06..a9420bb
--- a/res/xml/top_level_settings.xml
+++ b/res/xml/top_level_settings.xml
@@ -125,13 +125,13 @@android:fragment="com.android.settings.accessibility.AccessibilitySettings"settings:controller="com.android.settings.accessibility.TopLevelAccessibilityPreferenceController"/>-    <Preference
+    <!-- Preferenceandroid:key="top_level_screenshot"android:title="@string/screenshot_manager"android:summary="@string/screenshot_manager"android:icon="@drawable/ic_homepage_screenshot"android:order="-10"
-        android:fragment="com.android.settings.ScreenshotSettings"/>
+        android:fragment="com.android.settings.ScreenshotSettings"/ --><Preferenceandroid:key="top_level_system"

2. 去掉power键+音量减键组合截屏功能，frameworks/base：

diff --git a/services/core/java/com/android/server/policy/PhoneWindowManager.java b/services/core/java/com/android/server/policy/PhoneWindowManager.java
index 95c532e..3f4ebe8 100755
--- a/services/core/java/com/android/server/policy/PhoneWindowManager.java
+++ b/services/core/java/com/android/server/policy/PhoneWindowManager.java
@@ -966,7 +966,7 @@ public class PhoneWindowManager implements WindowManagerPolicy {&& (event.getFlags() & KeyEvent.FLAG_FALLBACK) == 0) {mScreenshotChordPowerKeyTriggered = true;mScreenshotChordPowerKeyTime = event.getDownTime();
-            interceptScreenshotChord();
+            //interceptScreenshotChord();interceptRingerToggleChord();}@@ -3841,7 +3841,7 @@ public class PhoneWindowManager implements WindowManagerPolicy {mScreenshotChordVolumeDownKeyTime = event.getDownTime();mScreenshotChordVolumeDownKeyConsumed = false;cancelPendingPowerKeyAction();
-                            interceptScreenshotChord();
+                            //interceptScreenshotChord();interceptAccessibilityShortcutChord();}} else {