Android 中利用異常來查看函數呼叫堆疊

     在將PowerManagerService.java檔案DEBUG_SCREEN_ON開啟後,在log發現RuntimeException,仔細查看代碼,原來是在setLightBrightness中的debug資訊,特地寫下來,以便以後使用.      1.setLightBrightness 函數:    private void setLightBrightness(int mask, int value) {        int brightnessMode = (mAutoBrightessEnabled                            ? LightsService.BRIGHTNESS_MODE_SENSOR                            : LightsService.BRIGHTNESS_MODE_USER);        if ((mask & SCREEN_BRIGHT_BIT) != 0) {            if (DEBUG_SCREEN_ON) {                RuntimeException e = new RuntimeException("here");                e.fillInStackTrace();                Slog.i(TAG, "Set LCD brightness: " + value, e);            }            mLcdLight.setBrightness(value, brightnessMode);        }        if ((mask & BUTTON_BRIGHT_BIT) != 0) {            mButtonLight.setBrightness(value);        }        if ((mask & KEYBOARD_BRIGHT_BIT) != 0) {            mKeyboardLight.setBrightness(value);        }    }     2.log資訊:I/PowerManagerService(  228): java.lang.RuntimeException: hereI/PowerManagerService(  228): at com.android.server.PowerManagerService.setLightBrightness(PowerManagerService.java:2160)I/PowerManagerService(  228): at com.android.server.PowerManagerService.access$4600(PowerManagerService.java:77)I/PowerManagerService(  228): at com.android.server.PowerManagerService$BrightnessState.jumpToTargetLocked(PowerManagerService.java:2265)I/PowerManagerService(  228): at com.android.server.PowerManagerService.setBacklightBrightness(PowerManagerService.java:3049)I/PowerManagerService(  228): at android.os.IPowerManager$Stub.onTransact(IPowerManager.java:227)I/PowerManagerService(  228): at android.os.Binder.execTransact(Binder.java:338)I/PowerManagerService(  228): at dalvik.system.NativeStart.run(Native Method)