住房和城乡建设厅网站首页,百度排行,网站建设的系统流程图,软件商店怎么下载摘要#xff1a;Android 10#xff08;API 级别 29#xff09;及更高版本会限制应用何时可以启动 activity 背景。这些限制有助于最大限度地减少对用户的干扰#xff0c; 让用户能够更好地控制其屏幕上显示的内容。本文以此为出发点#xff0c;基于展锐平台对系统代码进行…摘要Android 10API 级别 29及更高版本会限制应用何时可以启动 activity 背景。这些限制有助于最大限度地减少对用户的干扰 让用户能够更好地控制其屏幕上显示的内容。本文以此为出发点基于展锐平台对系统代码进行改造通过白名单的方式允许部分应用可以从后台启动activity。 Google官方 针对从后台启动 activity 的限制
1.添加白名单
Index: build/make/target/product/base_system.mk--- build/make/target/product/base_system.mk (版本 1957)build/make/target/product/base_system.mk (版本 1959)-269,6 269,9 wifi-service \wm \PRODUCT_PACKAGES background-startactivity-package-whitelist.txt
# VINTF data for system imagePRODUCT_PACKAGES \system_manifest.xml \
Index: frameworks/base/data/etc/background-startactivity-package-whitelist.txt--- frameworks/base/data/etc/background-startactivity-package-whitelist.txt (不存在的)frameworks/base/data/etc/background-startactivity-package-whitelist.txt (版本 1959)-0,0 1
com.android.permissioncontrollerIndex: frameworks/base/data/etc/Android.bp--- frameworks/base/data/etc/Android.bp (版本 1957)frameworks/base/data/etc/Android.bp (版本 1959)-133,3 133,9 sub_dir: permissions,src: com.android.timezone.updater.xml,}prebuilt_etc {name: background-startactivity-package-whitelist.txt,sub_dir: permissions,src: background-startactivity-package-whitelist.txt,
}
2. 实现方案
Index: frameworks/base/services/core/java/com/android/server/wm/ActivityStarter.java--- frameworks/base/services/core/java/com/android/server/wm/ActivityStarter.java (版本 1957)frameworks/base/services/core/java/com/android/server/wm/ActivityStarter.java (版本 1959)-1064,6 1064,14 allowed because SYSTEM_ALERT_WINDOW permission is granted.);return false;}// dont abort if the callingPackage on the whitelistif (ActivityBackgroundStartCheckUtil.isWhitelistApp(callingPackage, intent)) {Slog.w(TAG, Background activity start for callingPackageallowed because it is on the whitelist.);return false;}
// anything that has fallen through would currently be abortedSlog.w(TAG, Background activity start [callingPackage: callingPackage ; callingUid: callingUid
Index: frameworks/base/services/core/java/com/android/server/wm/ActivityBackgroundStartCheckUtil.java--- frameworks/base/services/core/java/com/android/server/wm/ActivityBackgroundStartCheckUtil.java (不存在的)frameworks/base/services/core/java/com/android/server/wm/ActivityBackgroundStartCheckUtil.java (版本 1959)-0,0 1,100
package com.android.server.wm;import android.content.Context;
import android.content.Intent;
import android.os.Environment;
import android.os.Process;
import android.text.TextUtils;
import android.util.Log;import com.android.internal.util.ArrayUtils;import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.HashSet;public class ActivityBackgroundStartCheckUtil{private static String TAG ActivityBackgroundStartCheckUtil;private static final File GRANT_SYS_APP_LIST_SYSTEM Environment.buildPath(Environment.getRootDirectory(), etc, permissions,background-startactivity-package-whitelist.txt);private static HashSetString mWhitelistAppSet new HashSetString();private static String Key[] {android, call};public static boolean isWhitelistApp(String callingPackage, Intent intent){sGetGrantSystemAppFromFile(mWhitelistAppSet, GRANT_SYS_APP_LIST_SYSTEM);Log.d(TAG, isWhitelistApp callingPackagecallingPackage);try {String packageName intent.getComponent().getPackageName();String className intent.getComponent().getClassName();if (mWhitelistAppSet.contains(callingPackage) ||mWhitelistAppSet.contains(packageName)) {return true; }for (String key : Key) {if (className.contains(key)) {return true; }}} catch (Exception e) {//e.printStackTrace();Log.d(TAG, e.getMessage());}return false;}/*** Get removable system app list from config file** param resultSet* Returned result list* param file* The config file*/private static void sGetGrantSystemAppFromFile(HashSetString resultSet, File file) {resultSet.clear();FileReader fr null;BufferedReader br null;try {if (file.exists()) {fr new FileReader(file);} else {Log.d(TAG, file in file does not exist!);return;}br new BufferedReader(fr);String line;while ((line br.readLine()) ! null) {line line.trim();if (!TextUtils.isEmpty(line)) {Log.d(TAG, read line line);resultSet.add(line);}}Log.e(TAG,GRANT_SYS_APP_LIST_SYSTEM sizeresultSet.size());} catch (Exception io) {Log.d(TAG, io.getMessage());} finally {try {if (br ! null) {br.close();}if (fr ! null) {fr.close();}} catch (IOException io) {Log.d(TAG, io.getMessage());}}}
}
