How to analyze the reason why the Activity is relaunched

The first stage

1. First determine the time point of relaunch in the event log

08-11 15:40:11.327  1000  1709  4746 I wm_relaunch_resume_activity: [0,133396621,3,com.android.xxx/.XXX]

2. Look forward to
   the time point near the configuration_changed related log in the corresponding event log. If you can’t find it before, please go to the second stage below.

08-11 15:40:11.051  1000  1709  4746 I configuration_changed: 4

3. Convert the config value in 2 to hexadecimal, and find the corresponding config name in attrs_manifest.xml. The
   above 4 converted to hexadecimal is 0x0004, which corresponds to the locale in the android function manifest file

     <attr name="configChanges">
        <flag name="mcc" value="0x0001" />
        <flag name="mnc" value="0x0002" />
        <flag name="locale" value="0x0004" />
        <flag name="touchscreen" value="0x0008" />
        <flag name="keyboard" value="0x0010" />
        <flag name="keyboardHidden" value="0x0020" />
        <flag name="navigation" value="0x0040" />
        <flag name="orientation" value="0x0080" />
        <flag name="screenLayout" value="0x0100" />
        <flag name="uiMode" value="0x0200" />
        <flag name="screenSize" value="0x0400" />
        <flag name="smallestScreenSize" value="0x0800" />
        <flag name="density" value="0x1000" />
        <flag name="layoutDirection" value="0x2000" />
        <flag name="colorMode" value="0x4000" />
        <flag name="fontScale" value="0x40000000" />
        <flag name="fontWeightAdjustment" value="0x10000000" />
    </attr>

4. The configuration in the function manifest file
   does not take effect after restarting the configuration to avoid the Activity, please go to the third stage

<activity 
        android:name=".XXXActivity"
        android:configChanges="locale"/>

second stage

If the relaunch page is not in the foreground when the config changes, it will trigger the activity's relaunch when the page resumes again

1. Search for the latest configuration_changed forward without looking at the time

// config发生在2min前
08-11 15:40:11.051  1000  1709  4746 I configuration_changed: 4
// 再次resume该页面
08-11 15:42:04.763  1000  1709  3335 I wm_set_resumed_activity: [0,com.android.settings/.XXX,resumeTopActivity]
// 同一system server线程触发relaunch
08-11 15:42:04.770  1000  1709  3335 I wm_relaunch_resume_activity: [0,88191110,3,com.android.settings/.XXX]

2. Repeat operations 3 and 4 of the first stage

The third phase

After the configuration does not take effect, the relaunch of the page still occurs

1. Determine whether the configuration takes effect.
   The target Activity is not executed before finish adb shell dumpsys activity a >a.txt
   . Check whether the configChanges value of the target Activity is consistent with expectations, and determine whether the corresponding modification is carried in the Rom.

  * Hist #4: ActivityRecord{
    
    541b086 u0 com.android.settings/.XXX t3}
      packageName=com.android.settings processName=com.android.settings
      launchedFromUid=1000 launchedFromPackage=com.android.provision launchedFromFeature=null userId=0
      app=ProcessRecord{
    
    74745ed 16242:com.android.settings/1000}
      Intent {
    
     cmp=com.android.settings/.XXX }
      ........
      configChanges=0xfa7  // 确定跟功能清单文件是否一致
      neverSandboxDisplayApis=false
      alwaysSandboxDisplayApis=false
      areBoundsLetterboxed=false

2. Check if there are other missing config changes. After
   executing adb shell wm logging enable-text WM_DEBUG_CONFIGURATIONthe command, re-line the problem and grab bugreoprt
3. Find the corresponding time point according to 1 and 2 of the first stage, and look for "allChanges" in the main log

08-11 15:42:04.763  1000  1709  3335 I wm_set_resumed_activity: [0,com.android.settings/.SetUpNewFingerprintInternalActivity,resumeTopActivity]
// 包括两个config，缺一不可 {CONFIG_LOCALE, CONFIG_LAYOUT_DIRECTION}
08-11 15:42:04.770  1000  1709  3335 V WindowManager: Configuration changes for ActivityRecord{
    
    541b086 u0 com.android.settings/.SetUpNewFingerprintInternalActivity t3}, allChanges={
    
    CONFIG_LOCALE, CONFIG_LAYOUT_DIRECTION}
08-11 15:42:04.770  1000  1709  3335 I wm_relaunch_resume_activity: [0,88191110,3,com.android.settings/.SetUpNewFingerprintInternalActivity]

4. Repeat operations 3 and 4 of the first stage to add missing configChanges