zhangqi6627的专栏

adb shell sqlite3 /data/user_de/0/com.android.providers.telephony/databases/telephony.db "'select * from carriers where mcc=\"460\" and mnc=\"01\";'"adb shell content query --uri content://telephony/carriers/ --where "mcc=460"前提：必须root或userdebug/eng版本

修改方法如下：vendor/mediatek/proprietary/packages/apps/Camera2/common/src/com/mediatek/camera/common/utils/BitmapCreator.java- bitmap = retriever.getFrameAtTime(-1);+ bitmap = retriever.getFrameAtTime(0);getFrameAtTime 这个方法的参数代表啥意思？/*

首先执行 adb shell svc bluetooth help看一下~/debuglogger/mobilelog/APLog_2021_1118_173806__1$ adb shell svc bluetooth helpControl Bluetooth serviceusage: svc bluetooth [enable|disable] Turn Bluetooth on or off.然后根据 Control Bluetooth service 字符串查找相关

首先执行 adb shell dumpsys battery 看看~/projects/MTK_R_6580_2/alps/frameworks$ adb shell dumpsys batteryCurrent Battery Service state: AC powered: false USB powered: true Wireless powered: false Max charging current: 500000 Max charging voltage: 500

问题分析报错log信息如下09-28 13:06:08.697706 30214 30214 E AndroidRuntime: FATAL EXCEPTION: main09-28 13:06:08.697706 30214 30214 E AndroidRuntime: Process: com.android.music, PID: 3021409-28 13:06:08.697706 30214 30214 E AndroidRuntime: java.lang.RuntimeExcepti

出发点在展锐平台开发Camera的时候有时候会遇到报错的情况，log如下：1-05 13:26:12.429 722 29945 E Camera3-Device: Camera 0: sendRequestsBatch: RequestThread: Unable to submit capture request 8115 to HAL device: Function not implemented (-38)01-05 13:26:12.430 29604 29766 E CAM2PORT

media命令使用方法adb shell media volume --get[v] will get volume[v] Connecting to AudioService[v] volume is 1 in range [0..15]​添加编译 media media_cmd模块diff --git a/alps/build/make/target/product/base_system.mk b/alps/build/make/target/product/base_system.m

1.编译source build/envsetup.shlunch xxxmake -j32 framework-minus-apex或用ninja编译./prebuilts/build-tools/linux-x86/bin/ninja -f ./out/combined-s9863a1h10_go_32b_Natv.ninja framework-minus-apex2.pushadb push out/target/product/s9863a1h10_go_32b/syste

自拍adb shell am start -a "android.media.action.STILL_IMAGE_CAMERA" -c "android.intent.category.VOICE" -f 0x10800000 --ei com.google.assistant.extra.TIMER_DURATION_SECONDS 3 --ei android.intent.extra.LENS_FACING_FRONT 0 --ez com.google.assistant.extra.USE_F

int resId = getResources().getIdentifier("config_mms_user_agent_profile_url", "string", "android");String resVal = getResources().getString(resId);

frameworks/base/services/core/java/com/android/server/audio/AudioService.javapublic void mute(boolean state) { boolean changed = false; synchronized (VolumeStreamState.class) { if (state != mIsMuted) { changed = true;

vendor/partner_gms/apps/GmsSampleIntegration/res_dhs_go/xml/partner_default_layout.xml<appwidget screen="0" x="0" y="2" packageName="com.android.deskclock" className="com.android.alarmclock.DigitalAppWidgetProvider" spanX="4" spanY="2" />这个文件的解析过程

packages/apps/Launcher3/src/com/android/launcher3/DeviceProfile.javafolderIconSizePx = IconNormalizer.getNormalizedCircleSize(iconSizePx) - 10;这里的 -10就是调整之后的大小，可以根据自己的项目来设置

关机充电是用minui开发的，代码路径如下vendor/sprd/proprietories-source/charge代码中的图片资源路径vendor/sprd/proprietories-source/charge/images手机上的图片资源路径vendor/etc/res/images项目的屏幕分辨率是540X1200，根据 vendor/sprd/proprietories-source/charge/ui.c代码中的判断，是 SIZE_720X1280static int res_

1.在 Settings/System/Developer options/DRAWING 里面看到有 “Display cutout” 菜单2.根据这个字符串找到packages/apps/Settings/res/values/strings.xml<string name="display_cutout_emulation">Display cutout</string>3.然后根据 display_cutout_emulation 字符串找到在 packages/a

我们最常使用Toast的方法是 Toast.makeText().show();在源码中找到 Toast.java 文件的路径frameworks/base/core/java/android/widget/Toast.java先看 makeText() 方法public static Toast makeText(@NonNull Context context, @Nullable Looper looper, @NonNull CharSequence text, @Duration int

build/make/core/Makefile# Set recovery_density to a density bucket based on TARGET_SCREEN_DENSITY, PRODUCT_AAPT_PREF_CONFIG,# or mdpi, in order of preference. We support both specific buckets (e.g. xdpi) and numbers,# which get remapped to a bucket.rec

frameworks/base/services/core/java/com/android/server/audio/AudioService.java/** Maximum volume index values for audio streams */protected static int[] MAX_STREAM_VOLUME = new int[] { 7, // STREAM_VOICE_CALL 15, // STREAM_SYSTEM 15, // STR

系统媒体数据库无法扫描到数据1.插入一张SDCARD2.push 3000左右图片到sdcard3.重启4.观察发现手机不能读取到图片数据 （读取方法：Images.Media.getContentUri(“external”)获取uri, 然后读取数据库）5.push 1首歌曲6.重启进入music,等待扫描结束,music不能显示歌曲根本原因是：多媒体文件所在目录下有.nomedia文件，因此，MediaProvider会把该目录的文件识别为普通文件，具体表现是在db文件中media_t

frameworks/base/packages/SettingsProvider/res/values/defaults.xml<integer name="def_lock_screen_show_notifications">0</integer>0：不显示1：显示代码实现的地方在frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/NotificationLockscreenUse

frameworks/base/core/res/res/values/dimens.xml<dimen name="status_bar_height">48dp</dimen>

frameworks/base/core/res/res/values/config.xml<!-- Control the behavior when the user short presses the power button. 0 - Nothing 1 - Go to sleep (doze) 2 - Really go to sleep (don't doze) 3 - Really go to sleep and go h

frameworks/opt/telephony/src/java/com/android/internal/telephony/DataEnableController.javaSettings.Global.putInt(mContext.getContentResolver(),- Settings.Global.MOBILE_DATA + SubscriptionManager.MAX_SUBSCRIPTION_ID_VALUE, 1);+

frameworks/base/core/res/res/values/strings.xml<string name="wifi_tether_configure_ssid_default" translatable="false">WIFI SSID</string>

system/bt/internal_include/bt_target.h#ifndef BTM_DEF_LOCAL_NAME#define BTM_DEF_LOCAL_NAME "BT NAME"#endif

Log.wtf()的意思不是 What The Fuck!，而是 What a Terrible Failure

ProjectConfig.mkMTK_MULTI_SIM_SUPPORT1.ss -单卡单待single standby2.dsds/dsda -双卡 （区别：dsds双卡双待Dual SIM Dual Standby，dsda双卡双通Dual SIM dual active，我们公司基本都是dsds)双卡双待又可以分双模双待，双网双待，双待单通，双待双通等。 就是可以2个号码同时拨通并可以同时通话的。中国移动使用的GSM(2G)/TD-SCDMA(3G)/TD-LTE(4G)这3模；中国

操作步骤：1.设置—network&internet—data saver，开启data saver2.设置—network&internet—wifi热点，开启热点实际结果：下拉状态栏本来只有一页，开启后第2页会多出图标。重置下拉状态栏，再次开启关闭 data saver/wifi 热点，第2页中不会多出图标修改方法：研究代码之后发现 SystemUI 里面本身就有这个机制 AutoAddTracker，第一次打开一些开关的时候会把已经添加过的 Tile 放到 Secure.Q

先查看 packages/apps/Settings/res/xml/timezones.xml 文件中是否有 Europe/Brussels 对应的时区，如果没有就先添加persist.sys.timezone=Asia/Shanghai比较老的版本在 system.prop 文件中，有些平台在 device.mk或config.mk 文件中覆盖掉了...

getWindow().addFlags(View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION);

frameworks/base/packages/SettingsProvider/res/values/defaults.xml<string name="def_low_battery_sound" translatable="false">/product/media/audio/ui/LowBattery.ogg</string><string name="def_desk_dock_sound" translatable="false">/product/m

在 alps/device 目录下 grep 搜索 ro.config.ringtone，找到对应的文件，修改 ro.config.ringtone 和 ro.config.ringtone1 即可。修改之后编译查看 out/target/product/sp9832e_1h10_go/system/build.prop 文件或刷机之后开机查看 adb shell getprop ro.config.ringtone 即可...

1.在 frameworks/base/packages/SettingsProvider/res/values/defaults.xml 文件中添加 def_wifi_direct_name 的默认值<string name="def_wifi_direct_name" translatable="false">TEST</string>2.在 frameworks/base/packages/SettingsProvider/src/com/android/provider

frameworks/base/packages/SettingsProvider/res/values/defaults.xml<bool name="def_auto_time">true</bool><bool name="def_auto_time_zone">true</bool>

frameworks\base\packages\SettingsProvider\res\values\defaults.xml<integer name="def_screen_off_timeout">1800000</integer>ps：单位毫秒 1800000毫秒=1800秒=30分

frameworks/base/packages/SettingsProvider/res/values/defaults.xml<bool name="def_airplane_mode_on">true</bool>

frameworks/base/packages/SettingsProvider/res/values/defaults.xml<string name="sagereal_time_12_24" translatable="false">24</string>

JB版本：请在 alps/external/wpa_supplicant_8/mtk-wpa_supplicant.conf 这个文件中增加 networt={} 即可。network需要字段的含义可以查看wpa_supplicant_8/wpa_supplicant.conf文件中的注释“network block fields:”后的说明即可。KK&L版本：请在hardware/mediatek/wlan/config/mtk-wpa_supplicant-overlay.conf文

In general,hotspot’s maximam connection is limited by hardware,so if you want to modify the number,must to make sure the performance of hardware is enough;packages/apps/Settings/res_ext/values/mtk_arrays.xml<string-array name="wifi_ap_max_connection.

frameworks/base/packages/SystemUI/res/values/config.xml<string name="quick_settings_tiles_stock" translatable="false"> wifi,cell,battery,dnd,flashlight,rotation,bt,airplane,location,hotspot,inversion,saver,work,cast,night</string>