利用windowManager实现App上的logcat

在APP上显示UDP或者HTTP接收到的内容

/**
 * @description: 调试用显示接收信息.
 * @autour: YQQ.yang.
 * @date 2017/6/12 9:19.
 */

public class LogService extends Service {

    private WindowManager windowManager;
    private WindowManager.LayoutParams logParams;
    private TextView logTv;
    private ScrollView logView;
    private boolean flag = true;
    private LinearLayout operateView;
    private WindowManager.LayoutParams operateParams;
    @SuppressLint("SimpleDateFormat")
    private SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss.SSS");
    private StringBuilder log = new StringBuilder("");
    private static final float ALPHA = 0.6F; // window 透明度.

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        windowManager = (WindowManager) getApplicationContext().getSystemService(WINDOW_SERVICE);
        // logView 布局参数.
        logParams = new WindowManager.LayoutParams();
        logParams.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
        logParams.type = WindowManager.LayoutParams.TYPE_TOAST;
        logParams.gravity = Gravity.TOP;
        logParams.format = PixelFormat.TRANSLUCENT;
        logParams.alpha = ALPHA;
        int screenHeight = windowManager.getDefaultDisplay().getHeight();
        int screenWidth = windowManager.getDefaultDisplay().getWidth();
        logParams.width = screenWidth;
        logParams.height = (int) (screenHeight * 0.5f);

        // 创建 logView 布局.
        logView = new ScrollView(this);
        logView.setBackgroundColor(0xFF000000);
        logTv = new TextView(this);
        logTv.setTextColor(0xCC00FF00);
        logTv.setHint("LOG: ");
        logTv.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
        logView.addView(logTv);

        // 操作栏 参数.
        operateParams = new WindowManager.LayoutParams();
        operateParams.type = WindowManager.LayoutParams.TYPE_TOAST;
        operateParams.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
        operateParams.format = PixelFormat.TRANSLUCENT;
        operateParams.alpha = ALPHA;
        operateParams.gravity = Gravity.BOTTOM;
        operateParams.width = WindowManager.LayoutParams.WRAP_CONTENT;
        operateParams.height = WindowManager.LayoutParams.WRAP_CONTENT;

        // 创建 操作栏布局.
        operateView = new LinearLayout(this);
        operateView.setOrientation(LinearLayout.HORIZONTAL);
        operateView.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
        ToggleButton toggleButton = new ToggleButton(this);
        toggleButton.setOnClickListener(v -> {
            if (toggleButton.isChecked()) {
                windowManager.removeView(logView);
            } else {
                if (null == logView.getParent()) {
                    windowManager.addView(logView, logParams);
                }
            }
        });
        Button clearLog = new Button(this);
        clearLog.setText("清除日志");
        clearLog.setTextColor(0XFFFF0000);
        clearLog.setOnClickListener(v -> {
            log = new StringBuilder("");
            logTv.setText(log);
        });
        Button cancelLog = new Button(this);
        cancelLog.setText("关闭调试器");
        cancelLog.setTextColor(0XFF00FF00);
        cancelLog.setOnClickListener(v -> this.onDestroy());

        operateView.addView(toggleButton);
        operateView.addView(clearLog);
        operateView.addView(cancelLog);

        super.onCreate();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        if (flag) {
            EventBus.getDefault().register(this);
            log = new StringBuilder("");
            flag = false;
            if (null == logView.getParent()) {
                windowManager.addView(logView, logParams);
            }
            if (null == operateView.getParent()) {
                windowManager.addView(operateView, operateParams);
            }
        }
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onDestroy() {
        EventBus.getDefault().unregister(this);
        if (null != logView.getParent()) {
            windowManager.removeView(logView);
        }
        if (null != operateView.getParent()) {
            windowManager.removeView(operateView);
        }
        flag = true;
        super.onDestroy();
    }

    @Subscribe(threadMode = ThreadMode.MAIN)
    public void onMessageEvent(ReceiveMsg receiveMsg) {
        String temp =
//                "IP : " + receiveMsg.getIp() + "    Port : " + receiveMsg.getPort() + " >>>返回数据 : \n" + (new String(receiveMsg.getMsg())) +
                "Udp Info ( " + getCurrentTime() + " ) : \n"
                        + "IP : " + receiveMsg.getIp()
                        + "    Port : " + receiveMsg.getPort()
                        + " >>>返回数据 (HexStr): \n"
                        + FormatUtil.byte2Hexstr(receiveMsg.getMsg());
        showLog(temp);
    }

    @Subscribe(threadMode = ThreadMode.MAIN)
    public void onMessageEvent(BaseEvents.HttpResultEvent event) {
        showLog("Http Info ( " + getCurrentTime() + " ) : \n" + event.getObject().toString());
    }

    private void showLog(String log) {
        log += "\n\n";
        this.log.append(log);
        logTv.setText(this.log);
    }

    private String getCurrentTime() {
        return dateFormat.format(System.currentTimeMillis());
    }
}