Android 中利用异常来查看函数调用堆栈

 

    在将PowerManagerService.java文件DEBUG_SCREEN_ON打开后,在log发现RuntimeException,仔细查看代码,原来是在setLightBrightness中的debug信息,

特地写下来,以便以后使用.

 

     1.setLightBrightness 函数:

    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信息:

I/PowerManagerService(  228): java.lang.RuntimeException: here

I/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)

 

补充：移动开发 , Android ,