Android(安卓)在屏幕上打印LOG

Android开发中需要迅速定位问题，在Android 屏幕上打印LOG，是一个很好的通道

基本的思路：启动LogService读取指定log，使用WindowManager展示到屏幕上

直接上代码

public class LogService extends Service {

   private ListView listview;
   private LinkedList logList = new LinkedList();
   private LogAdapter mAdapter;
   private final int MAX_LINE = 500;
   private SimpleDateFormat LOGCAT_TIME_FORMAT = new SimpleDateFormat("HH:mm:ss.SSS");
   private Thread readLog;
   private boolean isAllowReadLog = false;

   @Override
   public IBinder onBind(Intent arg0) {
       return null;
   }

   @Override
   public int onStartCommand(Intent intent, int flags, int startId) {

//Utility.LOG_TAG 为自定义的logString，service会读取此log

        readLog = new Thread(new LogReaderThread(Utility.LOG_TAG));
       readLog.start();
       createSystemWindow();
       isAllowReadLog = true;
       return START_STICKY;
   }

   @Override
   public void onDestroy() {
       removeSystemWindow();
       isAllowReadLog = false;
       super.onDestroy();
   }

   private void createSystemWindow() {
       final WindowManager.LayoutParams lp = new WindowManager.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT, WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY, 0, PixelFormat.TRANSLUCENT);
       // lp.gravity=Gravity.LEFT|Gravity.TOP; //调整悬浮窗口至左上角
       // 以屏幕左上角为原点，设置x、y初始化
       // lp.x=0;
       // lp.y=0;
       final LayoutInflater inflator = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
       final WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);
       listview = (ListView) inflator.inflate(R.layout.log_window, null);
       logList = new LinkedList();
       mAdapter = new LogAdapter(this, logList);
       listview.setAdapter(mAdapter);
       if (isAllowReadLog) {
           wm.addView(listview, lp);
       }

   }

   private void removeSystemWindow() {
       if (listview != null && listview.getParent() != null) {
           final WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);
           wm.removeViewImmediate(listview);
       }
   }

   class LogAdapter extends ArrayAdapter {

       private LayoutInflater inflator = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);

       public LogAdapter(Context context, List objects) {
           super(context, 0, objects);
       }

       public void add(LogLine line) {
           logList.add(line);
           notifyDataSetChanged();
       }

       @Override
       public LogLine getItem(int position) {
           return logList.get(position);
       }

       @Override
       public int getCount() {
           return logList.size();
       }

       @Override
       public View getView(int position, View convertView, ViewGroup parent) {
           LogLine line = getItem(position);
           ViewHolder holder;
           if (convertView == null) {
               holder = new ViewHolder();
               convertView = inflator.inflate(R.layout.log_line, parent, false);
               holder.time = (TextView) convertView.findViewById(R.id.log_time);
               holder.content = (TextView) convertView.findViewById(R.id.log_content);
               convertView.setTag(holder);
           } else {
               holder = (ViewHolder) convertView.getTag();
           }
           holder.time.setText(line.time);
           holder.content.setText(line.content);
           if (line.color != 0) {
               holder.content.setTextColor(line.color);
           } else {
               holder.content.setTextColor(getResources().getColor(android.R.color.white));
           }
           return convertView;
       }

   }

   class ViewHolder {
       public TextView time;
       public TextView content;
   }

   class LogReaderThread implements Runnable {

       private String filter;

       public LogReaderThread(String filter) {
           this.filter = filter;
       }

       @Override
       public void run() {
           Process mLogcatProc = null;
           BufferedReader reader = null;
           try {
               mLogcatProc = Runtime.getRuntime().exec(new String[] { "logcat", filter + " *:S" });
               reader = new BufferedReader(new InputStreamReader(mLogcatProc.getInputStream()));
               String line;

               while (isAllowReadLog) {
                   if ((line = reader.readLine()) != null) {
                       Message msg = new Message();
                       msg.obj = line;
                       handler.sendMessage(msg);
                   }
               }
           } catch (Exception e) {
               e.printStackTrace();
           }
       }
   }

   private void buildLogLine(String line) {
       LogLine log = new LogLine();
       log.time = LOGCAT_TIME_FORMAT.format(new Date()) + ": ";
       if (line.startsWith("I")) {
           log.color = Color.parseColor("#008f86");
       } else if (line.startsWith("V")) {
           log.color = Color.parseColor("#fd7c00");
       } else if (line.startsWith("D")) {
           log.color = Color.parseColor("#8f3aa3");
       } else if (line.startsWith("E")) {
           log.color = Color.parseColor("#fe2b00");
       }
       if (line.contains(")")) {
           line = line.substring(line.indexOf(")") + 1, line.length());
       }
       log.content = line;

       while (logList.size() > MAX_LINE) {
           logList.remove();
       }
       mAdapter.add(log);
   }

   private Handler handler = new Handler() {
       public void handleMessage(Message msg) {
           buildLogLine(msg.obj.toString());
       };
   };

}

//实体类

public class LogLine {

   public String time;
   public String content;
   public int color;

}

启动server，log将输出到屏幕上，Android共勉！

更多相关文章

随机推荐