android.view.KeyEvent#KEYCODE_W源码实例Demo

static public int keyCode2Direction(int keyCode) {
	/* interprets a keyCode as a direction
	 * input:   keyCode  - a key code passed to handler           
	 * output: [0 1 2 3] -> [left down up right]; -1 -> unknown
	 */
	switch (keyCode) {
	// WASD, ZX-NM spread, AS-KL spread
	// 12-90 spread, D-Pad
	// Headphone music controller
	case KeyEvent.KEYCODE_A: case KeyEvent.KEYCODE_Z:
	case KeyEvent.KEYCODE_1: case KeyEvent.KEYCODE_DPAD_LEFT:
	case KeyEvent.KEYCODE_MEDIA_PREVIOUS: case KeyEvent.KEYCODE_MEDIA_REWIND:
	case KeyEvent.KEYCODE_BUTTON_X:
		return 0;
	case KeyEvent.KEYCODE_S: case KeyEvent.KEYCODE_X:
	case KeyEvent.KEYCODE_2: case KeyEvent.KEYCODE_DPAD_DOWN:
	case KeyEvent.KEYCODE_MEDIA_STOP:
	case KeyEvent.KEYCODE_BUTTON_A:
		return 1;
	case KeyEvent.KEYCODE_W: case KeyEvent.KEYCODE_N: case KeyEvent.KEYCODE_K:
	case KeyEvent.KEYCODE_9: case KeyEvent.KEYCODE_DPAD_UP:
	case KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE:
	case KeyEvent.KEYCODE_BUTTON_Y:
		return 2;
	case KeyEvent.KEYCODE_D: case KeyEvent.KEYCODE_M: case KeyEvent.KEYCODE_L:
	case KeyEvent.KEYCODE_0: case KeyEvent.KEYCODE_DPAD_RIGHT:
	case KeyEvent.KEYCODE_MEDIA_NEXT: case KeyEvent.KEYCODE_MEDIA_FAST_FORWARD:
	case KeyEvent.KEYCODE_BUTTON_B:
		return 3;
	default:
		return -1;
	}
}
 

public boolean shouldOverrideKeyEvent(KeyEvent event) {
    int keyCode = event.getKeyCode();
    // We need to send almost every key to WebKit. However:
    // 1. We don't want to block the device on the renderer for
    // some keys like menu, home, call.
    // 2. There are no WebKit equivalents for some of these keys
    // (see app/keyboard_codes_win.h)
    // Note that these are not the same set as KeyEvent.isSystemKey:
    // for instance, AKEYCODE_MEDIA_* will be dispatched to webkit.
    if (keyCode == KeyEvent.KEYCODE_MENU ||
        keyCode == KeyEvent.KEYCODE_HOME ||
        keyCode == KeyEvent.KEYCODE_BACK ||
        keyCode == KeyEvent.KEYCODE_CALL ||
        keyCode == KeyEvent.KEYCODE_ENDCALL ||
        keyCode == KeyEvent.KEYCODE_POWER ||
        keyCode == KeyEvent.KEYCODE_HEADSETHOOK ||
        keyCode == KeyEvent.KEYCODE_CAMERA ||
        keyCode == KeyEvent.KEYCODE_FOCUS ||
        keyCode == KeyEvent.KEYCODE_VOLUME_DOWN ||
        keyCode == KeyEvent.KEYCODE_VOLUME_MUTE ||
        keyCode == KeyEvent.KEYCODE_VOLUME_UP) {
        return true;
    }

    // We also have to intercept some shortcuts before we send them to the ContentView.
    if (event.isCtrlPressed() && (
            keyCode == KeyEvent.KEYCODE_TAB ||
            keyCode == KeyEvent.KEYCODE_W ||
            keyCode == KeyEvent.KEYCODE_F4)) {
        return true;
    }

    return false;
}
 

public boolean shouldOverrideKeyEvent(KeyEvent event) {
    int keyCode = event.getKeyCode();
    // We need to send almost every key to WebKit. However:
    // 1. We don't want to block the device on the renderer for
    // some keys like menu, home, call.
    // 2. There are no WebKit equivalents for some of these keys
    // (see app/keyboard_codes_win.h)
    // Note that these are not the same set as KeyEvent.isSystemKey:
    // for instance, AKEYCODE_MEDIA_* will be dispatched to webkit.
    if (keyCode == KeyEvent.KEYCODE_MENU ||
        keyCode == KeyEvent.KEYCODE_HOME ||
        keyCode == KeyEvent.KEYCODE_BACK ||
        keyCode == KeyEvent.KEYCODE_CALL ||
        keyCode == KeyEvent.KEYCODE_ENDCALL ||
        keyCode == KeyEvent.KEYCODE_POWER ||
        keyCode == KeyEvent.KEYCODE_HEADSETHOOK ||
        keyCode == KeyEvent.KEYCODE_CAMERA ||
        keyCode == KeyEvent.KEYCODE_FOCUS ||
        keyCode == KeyEvent.KEYCODE_VOLUME_DOWN ||
        keyCode == KeyEvent.KEYCODE_VOLUME_MUTE ||
        keyCode == KeyEvent.KEYCODE_VOLUME_UP) {
        return true;
    }

    // We also have to intercept some shortcuts before we send them to the ContentView.
    if (event.isCtrlPressed() && (
            keyCode == KeyEvent.KEYCODE_TAB ||
            keyCode == KeyEvent.KEYCODE_W ||
            keyCode == KeyEvent.KEYCODE_F4)) {
        return true;
    }

    return false;
}