Add heap dump options to Developer options.

1. Add a button to capture a system heap dump on demand.
2. Add a toggle to enable/disable automatic system heap dump captures.

Bug: 77490269
Test: manual
Change-Id: I12b41de82f641ae239ea8e48f0180392aca5dbe8

src/com/android/settings/development/AutomaticSystemServerHeapDumpPreferenceController.java

@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2019 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 com.android.settings.development;
+
+import android.content.Context;
+import android.os.Build;
+import android.os.UserManager;
+import android.provider.Settings;
+
+import androidx.preference.Preference;
+import androidx.preference.SwitchPreference;
+
+import com.android.settings.core.PreferenceControllerMixin;
+import com.android.settingslib.development.DeveloperOptionsPreferenceController;
+
+public class AutomaticSystemServerHeapDumpPreferenceController extends
+        DeveloperOptionsPreferenceController implements Preference.OnPreferenceChangeListener,
+        PreferenceControllerMixin {
+
+    private static final String KEY_AUTOMATIC_SYSTEM_SERVER_HEAP_DUMPS =
+            "automatic_system_server_heap_dumps";
+
+    private static final int SETTING_VALUE_OFF = 0;
+    private static final int SETTING_VALUE_ON = 1;
+
+    private final UserManager mUserManager;
+    private final boolean mIsConfigEnabled;
+
+    public AutomaticSystemServerHeapDumpPreferenceController(Context context) {
+        super(context);
+        mIsConfigEnabled = context.getResources().getBoolean(
+                com.android.internal.R.bool.config_debugEnableAutomaticSystemServerHeapDumps);
+        mUserManager = context.getSystemService(UserManager.class);
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return Build.IS_DEBUGGABLE && mIsConfigEnabled
+                && !mUserManager.hasUserRestriction(UserManager.DISALLOW_DEBUGGING_FEATURES);
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY_AUTOMATIC_SYSTEM_SERVER_HEAP_DUMPS;
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        final boolean isEnabled = (Boolean) newValue;
+        Settings.Secure.putInt(mContext.getContentResolver(),
+                Settings.Global.ENABLE_AUTOMATIC_SYSTEM_SERVER_HEAP_DUMPS,
+                isEnabled ? SETTING_VALUE_ON : SETTING_VALUE_OFF);
+        return true;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        final int mode = Settings.Secure.getInt(mContext.getContentResolver(),
+                Settings.Global.ENABLE_AUTOMATIC_SYSTEM_SERVER_HEAP_DUMPS, SETTING_VALUE_ON);
+        ((SwitchPreference) mPreference).setChecked(mode != SETTING_VALUE_OFF);
+    }
+
+    @Override
+    protected void onDeveloperOptionsSwitchDisabled() {
+        super.onDeveloperOptionsSwitchDisabled();
+        Settings.Secure.putInt(mContext.getContentResolver(),
+                Settings.Global.ENABLE_AUTOMATIC_SYSTEM_SERVER_HEAP_DUMPS, SETTING_VALUE_OFF);
+        ((SwitchPreference) mPreference).setChecked(false);
+    }
+}