Android11 Framework添加Powerkey事件去抖

最新推荐文章于 2024-09-09 17:03:14 发布

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最新推荐文章于 2024-09-09 17:03:14 发布

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本文链接：https://blog.youkuaiyun.com/DKBDKBDKB/article/details/131655029

文章介绍了在Android系统中，为防止短时间内频繁触发PowerKey导致屏幕反复亮灭，采用了一个名为Debouncer的工具类来实现去抖动机制。Debouncer类检测两次事件触发的时间间隔，若小于预设值则忽略后续事件，确保每次执行完一次唤醒或休眠操作后才响应新的PowerKey事件。改动涉及PowerManagerService的内部逻辑。

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需求：短时间来回触控powerkey造成屏幕来回亮灭切换，需要去抖动，即在每次响应执行完一次休眠或者唤醒事件后，再响应powerkey事件。

1、首先在framework中做了一个去抖动的工具类：

diff --git a/api/current.txt b/api/current.txt
index 689cf4833a0..e2eab020325 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -61605,6 +61605,17 @@ package android.widget.inline {
 
 }
 
+package android.yuanfudao.util {
+
+  public class Debouncer {
+    ctor public Debouncer();
+    ctor public Debouncer(long);
+    method public boolean ignore();
+    method public void setDebounceTime(long);
+  }
+
+}
+
 package dalvik.annotation {
 
   @Deprecated @java.lang.annotation.Retention(java.lang.annotation.RetentionPolicy.RUNTIME) @java.lang.annotation.Target({java.lang.annotation.ElementType.ANNOTATION_TYPE}) public @interface TestTarget {
diff --git a/core/java/android/yuanfudao/util/Debouncer.java b/core/java/android/yuanfudao/util/Debouncer.java
new file mode 100755
index 00000000000..83724e9e6d7
--- /dev/null
+++ b/core/java/android/yuanfudao/util/Debouncer.java
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.yuanfudao.util;
+
+import android.os.SystemClock;
+
+public class Debouncer {
+
+    private long debounceTime = 500L;
+
+    private long lastTriggerTimestamp;
+
+    public Debouncer() {}
+
+    public Debouncer(long paramLong) {
+        this.debounceTime = paramLong;
+    }
+
+    public boolean ignore() {
+        long l1 = SystemClock.elapsedRealtime();
+        long l2 = this.lastTriggerTimestamp;
+        if (l2 != 0L && l1 - l2 < this.debounceTime){
+            return true;
+        }else {
            this.lastTriggerTimestamp = l1;
+            return false;
+        }
+    }
+
+    public void setDebounceTime(long paramLong) {
+        this.debounceTime = paramLong;
+    }
+}
diff --git a/non-updatable-api/current.txt b/non-updatable-api/current.txt
index 07be752e01d..e9154685b05 100644
--- a/non-updatable-api/current.txt
+++ b/non-updatable-api/current.txt
@@ -59766,6 +59766,17 @@ package android.widget.inline {
 
 }
 
+package android.yuanfudao.util {
+
+  public class Debouncer {
+    ctor public Debouncer();
+    ctor public Debouncer(long);
+    method public boolean ignore();
+    method public void setDebounceTime(long);
+  }
+
+}
+
 package dalvik.annotation {
 
   @Deprecated @java.lang.annotation.Retention(java.lang.annotation.RetentionPolicy.RUNTIME) @java.lang.annotation.Target({java.lang.annotation.ElementType.ANNOTATION_TYPE}) public @interface TestTarget {

2、PowerManagerService添加相关逻辑：

--- a/services/core/java/com/android/server/power/PowerManagerService.java
+++ b/services/core/java/com/android/server/power/PowerManagerService.java
@@ -118,6 +118,7 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Objects;
+import android.yuanfudao.util.Debouncer;
 
 /**
  * The power manager service is responsible for coordinating power management
@@ -612,6 +613,8 @@ public final class PowerManagerService extends SystemService
     // Per-profile state to track when a profile should be locked.
     private final SparseArray<ProfilePowerState> mProfilePowerState = new SparseArray<>();
 
+       private Debouncer debouncer = new Debouncer(2500L);
+
     private static final class ProfilePowerState {
         // Profile user id.
         final @UserIdInt int mUserId;
@@ -1701,6 +1704,13 @@ public final class PowerManagerService extends SystemService
             return false;
         }
 
+        //Heguodong add - begin
+        if (this.debouncer.ignore()) {
+            Slog.d(TAG, "[YFD_PowerManagerService]wakeUpNoUpdateLocked,!!!rejected!!!" );
+            return false;
+        }
+        //Heguodong add - end
+
         //if (isAirplaneModeOn()) {
            // setAirplaneModeOn(false);
         //}
@@ -1763,6 +1773,13 @@ public final class PowerManagerService extends SystemService
             return false;
         }
 
+        //Heguodong add - begin
+        if (this.debouncer.ignore()) {
+            Slog.d(TAG, "[YFD_PowerManagerService]goToSleepNoUpdateLocked,!!!rejected!!!" );
+            return false;
+        }
+        //Heguodong add - end
+
         Trace.traceBegin(Trace.TRACE_TAG_POWER, "goToSleep");
         try {
             reason = Math.min(PowerManager.GO_TO_SLEEP_REASON_MAX,

增量编译验证：达到的效果是每次经历完一次完整的唤醒、休眠逻辑才会响应PowerKey事件。

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