Android 乱七八糟的设置记录

Android 乱七八糟的设置记录

1、添加永不休眠

frameworks/base/packages/SettingsProvider/res/values/defaults.xml

<integer name="def_screen_off_timeout">0</integer> // 默认休眠时间设为0

frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java

    private void updateLockScreenTimeout() {
        synchronized (mScreenLockTimeout) {
            boolean enable = (mAllowLockscreenWhenOn && mAwake &&
                    mKeyguardDelegate != null && mKeyguardDelegate.isSecure(mCurrentUserId));
            if (mLockScreenTimerActive != enable) {
                if (enable) {
                    if (localLOGV) Log.v(TAG, "setting lockscreen timer");
                    mHandler.removeCallbacks(mScreenLockTimeout); // remove any pending requests
                    if (mLockScreenTimeout != 0) { // 添加判断，时间为0则永不休眠，不为0继续执行
                        mHandler.postDelayed(mScreenLockTimeout, mLockScreenTimeout);
                    }
                } else {
                    if (localLOGV) Log.v(TAG, "clearing lockscreen timer");
                    mHandler.removeCallbacks(mScreenLockTimeout);
                }
                mLockScreenTimerActive = enable;
            }
        }
    }

frameworks/base/services/core/java/com/android/server/power/PowerManagerService.java

    private void updateUserActivitySummaryLocked(long now, int dirty) {
        // Update the status of the user activity timeout timer.
        if ((dirty & (DIRTY_WAKE_LOCKS | DIRTY_USER_ACTIVITY
                | DIRTY_WAKEFULNESS | DIRTY_SETTINGS)) != 0) {
            mHandler.removeMessages(MSG_USER_ACTIVITY_TIMEOUT);

            long nextTimeout = 0;
            if (mWakefulness == WAKEFULNESS_AWAKE
                    || mWakefulness == WAKEFULNESS_DREAMING
                    || mWakefulness == WAKEFULNESS_DOZING) {

                ......

                //  如果设置时间为0，则跳过 {
                if (mScreenOffTimeoutSetting != 0) { // never screenOff
                    if (mUserActivitySummary != 0 && nextTimeout >= 0) {
                        Message msg = mHandler.obtainMessage(MSG_USER_ACTIVITY_TIMEOUT);
                        msg.setAsynchronous(true);
                        mHandler.sendMessageAtTime(msg, nextTimeout);
                    }
                } else {
                    mUserActivitySummary |= USER_ACTIVITY_SCREEN_BRIGHT;
                }
                // }
            } else {
                mUserActivitySummary = 0;
            }
            
            ......
        }
    }

packages/apps/Settings/res/values/arrays.xml

<string-array name="screen_timeout_entries">
    <!-- 设置中添加never选项 -->
    <item>never</item>

<string-array name="screen_timeout_values" translatable="false">
    <!-- 设置中添加nerver时间 0  -->
    <item>0</item>

2、刷完bootimage WIFI无法打开

相同环境下编译 vendor/qcom/opensource/wlan/prima/ 目录下代码，生成 pronto_wlan.ko
push到机器 vendor/lib/modules/pronto/ 目录即可

3、设置persist.sys属性值

属性值以persist.sys.开头的属于持久化的，即重启后设置的值依然保存。需要系统权限，即使用系统签名并在AndroidManifest.xml 声明android:sharedUserId=“android.uid.system”

4、android 源码网站

https://www.androidos.net.cn/sourcecode

5、fastboot 常见指令

fastboot erase system 擦除分区

fastboot getvar secure 查看是否secure boot签名的

fastboot --set-active=a 设置A/B分区

6、签名及查看签名

java -jar signapk.jar testkey.x509.pem testkey.pk8　old.apk new.apk

keytool -printcert -file META-INF/CERT.RSA

7、Linux权限说明

权限说明（共十位）：一些系统文件有权限限制，随意push不同步修改还原权限会导致手机无法开机，例如build.prop文件
-rw-------
1位：d：文件夹
-：文件
2-4位：当前用户权限
5-7位：当前用户所在组权限
8-10位：其他用户权限
权限都有三个二进制数字组成，代表不同的权限。
如：二进制110 —> rw- 转换为十进制为6 代表rw-可读可写
　　111 rwx 转换为十进制为7 代表rwx可读可写可运行

chown root:shell xxx 修改文件用户和组,仅限root用户使用
chmod 0777 xxx 修改文件权限为0777