private static final boolean IS_DEBUG_BUILD = Build.TYPE.equals("eng") || Build.TYPE.equals("userdebug");
分析異常時往往需要關注的重要目錄：
/data/anr/traces.txt
/data/tombstones/tombstone_X
/data/system/dropbox/
Log.i("LogTag","------------", new Exception()); 人爲拋出異常 打印運行堆棧，此命令適用於源碼編譯中，但在APP中使用就會報錯,APP中可以這樣使用：
Log.i("LogTag","------------",“ ---”+new Exception());
Thread.currentThread().dumpStack(); //方法1
Log.d(TAG,"Gityuan", new RuntimeException("Gityuan")); //方法2
new RuntimeException("Gityuan").printStackTrace(); //方法3
MTK的mtkloger：
進入應用暗碼 ： *#*#3646633#*#*
log的保存路徑 /storage/emulated/0/mtklog
如部分平板系統預裝撥號盤如何打開MTKlog
adb shell am start -n com.mediatek.mtklogger/com.mediatek.mtklogger.MainActivity
mtklog 的分類：MDLog、Mobile Log、Network Log，可能出現的aee_exp log
MD log：medom 相關底層的log
Mobile Log：主要是Android log 和kernel log
Network log：網絡相關log
aee_exp log ：crash ANR 重啓相關的log輸出
對應log文件名稱爲：
crash_log ：崩潰日誌，主要輸出 程序崩潰造成的crash log
events_log：事件日誌，主要輸出記錄各個activity週期及事件
kernel_log：底層驅動，按鍵，低內存相關log
sys_log：系統日誌，Exception定位點
radio_log：輸出通話，網絡狀態變化
main_log：詳盡輸出每一步的log
參考原文 ： https://blog.csdn.net/weixin_33473519/article/details/53434800?utm_source=blogxgwz
https://rayleeya.iteye.com/blog/1955652 此文對android的anr問題有詳細說明
ANR，是“Application Not Responding”的縮寫，即“應用程序無響應”。在Android中，ActivityManagerService（簡稱AMS）和WindowManagerService（簡稱WMS）會監測應用程序的響應時間，如果應用程序主線程（即UI線程）在超時時間內對輸入事件沒有處理完畢，或者對特定操作沒有執行完畢，就會出現ANR。對於輸入事件沒有處理完畢產生的ANR，Android會顯示一個對話框，提示用戶當前應用程序沒有響應，用戶可以選擇繼續等待或者關閉這個應用程序（也就是殺掉這個應用程序的進程）。
1:關鍵字搜索：
FATAL,leaked, block,Pid id XXX,crash,DALVIK THREADS, OOM,unfinished died
查找應用包名--快速定位ANR
The application may be doing too much work on its main thread.
AndroidRuntime(xxxx): Shutting down VM
線程的狀態是native則表示當前正在執行jni,
聰明的你肯定已經知道，之所以trace信息會輸出到“/data/anr/traces.txt”文件中，就是系統屬性“dalvik.vm.stack-trace-file”設置的。你可以通過在設備的shell中使用setprop和getprop對系統屬性進行設置和讀取：
getprop dalvik.vm.stack-trace-file
setprop dalvik.vm.stack-trace-file /tmp/stack-traces.txt
此 Dialog的java位置：
frameworks\base\services\core\java\com\android\server\am\AppNotRespondingDialog.java
alps\frameworks\base\services\core\java\com\android\server\am\AppErrors.java ::appNotResponding()
此處發送Handler message爲 SHOW_NOT_RESPONDING_UI_MSG
// Set the app's notResponding state, and look up the errorReportReceiver
makeAppNotRespondingLocked(app,
activity != null ? activity.shortComponentName : null,
annotation != null ? "ANR " + annotation : "ANR",
info.toString());
// Bring up the infamous App Not Responding dialog
Message msg = Message.obtain();
msg.what = ActivityManagerService.SHOW_NOT_RESPONDING_UI_MSG;
msg.obj = new AppNotRespondingDialog.Data(app, activity, aboveSystem);
mService.mUiHandler.sendMessage(msg);
接着會在ActivityManagerService.java類中接收此Message並對應處理
alps\frameworks\base\services\core\java\com\android\server\am\ActivityManagerService.java
final class UiHandler extends Handler {
public UiHandler() {
super(com.android.server.UiThread.get().getLooper(), null, true);
}
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case SHOW_ERROR_UI_MSG: {
mAppErrors.handleShowAppErrorUi(msg);
ensureBootCompleted();
} break;
case SHOW_NOT_RESPONDING_UI_MSG: {
mAppErrors.handleShowAnrUi(msg);
ensureBootCompleted();
} break;
在AppError.java中的handleShowAppErrorUI()
if (mService.canShowErrorDialogs() || showBackground) {
dialogToShow = new AppNotRespondingDialog(mService, mContext, data);
proc.anrDialog = dialogToShow;
} else {
MetricsLogger.action(mContext, MetricsProto.MetricsEvent.ACTION_APP_ANR,
AppNotRespondingDialog.CANT_SHOW);
// Just kill the app if there is no dialog to be shown.
mService.killAppAtUsersRequest(proc, null);
}
}
// If we've created a crash dialog, show it without the lock held
if (dialogToShow != null) {
dialogToShow.show();
}
兩個標籤同時過濾adb 命令: adb shell "logcat |grep -e ActivityManager: -e WindowManager:"
下面的打印爲了log信息減少，所以分別打印方便查閱 ，
C:\Users\User>adb logcat |findstr "ActivityManager" \\點擊Launcher中圖標 打開APP DeskClock
08-12 06:35:09.605 1043 8961 I ActivityManager: START u0 {act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.android.deskclock/.DeskClock bnds=[795,131][990
,423]} from uid 10015
08-12 06:35:09.703 1043 8961 V WindowManager: Changing focus from Window{cfe72a u0 com.android.launcher3/com.android.launcher3.Launcher} to null Callers=com.android.server.wm.WindowManagerService.se
tFocusedApp:2739 com.android.server.am.ActivityManagerService.setResumedActivityUncheckLocked:3325 com.android.server.am.ActivityStack.setResumedActivityLocked:2312 com.android.server.am.ActivityStack
.minimalResumeActivityLocked:1115
08-12 06:35:09.890 1043 1121 I ActivityManager: Displayed com.android.deskclock/.DeskClock: +201ms
--------------------------------------------------------------------------------
C:\Users\User>adb logcat -c|findstr "ActivityManager"
C:\Users\User>adb logcat |findstr "ActivityManager" \\退出APP
08-12 06:35:29.715 1043 1078 V WindowManager: Changing focus from Window{4cebd29 u0 com.android.deskclock/com.android.deskclock.DeskClock} to null Callers=com.android.server.wm.WindowManagerService.
setFocusedApp:2739 com.android.server.am.ActivityManagerService.setResumedActivityUncheckLocked:3325 com.android.server.am.ActivityStack.setResumedActivityLocked:2312 com.android.server.am.ActivitySta
ck.resumeTopActivityInnerLocked:2694
User>adb logcat -c |findstr "WindowManager:"
User>adb logcat |findstr "WindowManager:" //點擊Launcher中圖標 打開APP:DeskClock
21:06.149 1043 1315 V WindowManager: Set focused app to: AppWindowToken{24e89b8 token=Token{b72727a ActivityRecord{5decea5 u0 com.android.deskclock/.DeskClock t43}}} old focus=AppWindowToke
token=Token{64857d6 ActivityRecord{eb9b98 u0 com.android.launcher3/.Launcher t33}}} moveFocusNow=true
21:06.149 1043 1315 V WindowManager: findFocusedWindow: No focusable windows.
21:06.149 1043 1315 V WindowManager: Changing focus from Window{cfe72a u0 com.android.launcher3/com.android.launcher3.Launcher} to null Callers=com.android.server.wm.WindowManagerService.se
pp:2739 com.android.server.am.ActivityManagerService.setResumedActivityUncheckLocked:3325 com.android.server.am.ActivityStack.setResumedActivityLocked:2312 com.android.server.am.ActivityStack
esumeActivityLocked:1115
21:06.149 1043 1315 D WindowManager: Input focus has changed to null
21:06.152 1043 1315 V WindowManager: findFocusedWindow: No focusable windows.
21:06.160 1043 6439 V WindowManager: findFocusedWindow: No focusable windows.
21:06.481 1043 2119 I WindowManager: Relayout Window{c7e57f5 u0 com.android.deskclock/com.android.deskclock.DeskClock}: oldVis=4 newVis=0 focusMayChange = true
21:06.487 1043 2119 V WindowManager: Changing focus from null to Window{c7e57f5 u0 com.android.deskclock/com.android.deskclock.DeskClock} Callers=com.android.server.wm.WindowManagerService.
indow:2179 com.android.server.wm.Session.relayout:235 android.view.IWindowSession$Stub.onTransact:286 com.android.server.wm.Session.onTransact:162
21:06.487 1043 2119 D WindowManager: Input focus has changed to Window{c7e57f5 u0 com.android.deskclock/com.android.deskclock.DeskClock}
-------------------------------------------------------------------------------------
User>adb logcat -c|findstr "WindowManager:"
User>adb logcat |findstr "WindowManager:" //退出APP:DeskClock 到Launcher
21:27.964 1043 1226 D WindowManager: interceptKeyTi keyCode=4 down=false repeatCount=0 keyguardOn=false mHomePressed=false canceled=false metaState:0
21:27.984 1043 6439 V WindowManager: Set focused app to: AppWindowToken{fb1c0e3 token=Token{64857d6 ActivityRecord{eb9b98 u0 com.android.launcher3/.Launcher t33}}} old focus=AppWindowToken{
oken=Token{b72727a ActivityRecord{5decea5 u0 com.android.deskclock/.DeskClock t43}}} moveFocusNow=true
21:27.984 1043 6439 V WindowManager: findFocusedWindow: No focusable windows.
21:27.985 1043 6439 V WindowManager: Changing focus from Window{c7e57f5 u0 com.android.deskclock/com.android.deskclock.DeskClock} to null Callers=com.android.server.wm.WindowManagerService.
dApp:2739 com.android.server.am.ActivityManagerService.setResumedActivityUncheckLocked:3325 com.android.server.am.ActivityStack.setResumedActivityLocked:2312 com.android.server.am.ActivitySta
TopActivityInnerLocked:2694
21:27.985 1043 6439 D WindowManager: Input focus has changed to null
21:28.002 1043 1315 V WindowManager: findFocusedWindow: No focusable windows.
21:28.044 1043 6439 I WindowManager: Relayout Window{cfe72a u0 com.android.launcher3/com.android.launcher3.Launcher}: oldVis=4 newVis=0 focusMayChange = true
21:28.048 1043 6439 V WindowManager: Changing focus from null to Window{cfe72a u0 com.android.launcher3/com.android.launcher3.Launcher} Callers=com.android.server.wm.WindowManagerService.re
dow:2179 com.android.server.wm.Session.relayout:235 android.view.IWindowSession$Stub.onTransact:286 com.android.server.wm.Session.onTransact:162
21:28.048 1043 6439 D WindowManager: Input focus has changed to Window{cfe72a u0 com.android.launcher3/com.android.launcher3.Launcher}