Android 单字阅读

 package com.desmand.screencapture;

 import android.app.Activity;
 import android.content.Intent;
 import android.os.Bundle;
 import android.os.Environment;
 import android.os.Handler;
 import android.os.Message;
 import android.util.Log;
 import android.view.KeyEvent;
 import android.view.View;
 import android.widget.Button;
 import android.widget.TextView;
 import android.widget.Toast;

 import java.io.BufferedInputStream;
 import java.io.BufferedReader;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;

 public class MainActivity extends Activity implements View.OnClickListener, Runnable {

     private static String TAG = "ScreenCapture";
     Thread showTextThread;
     Button start_service_btn;
     private TextView show_text_tv;
     private String readerString;
     private String file_path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/Panasonic/";
     private String fileName = file_path + "test.txt";
     private char testChar;

     private boolean isRun;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(null);

         startService(new Intent(this, ScreenCaptureService.class));
         this.finish();

 //        super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         start_service_btn = (Button) findViewById(R.id.start_service_btn);
         start_service_btn.setOnClickListener(this);
         show_text_tv = (TextView) findViewById(R.id.show_text_tv);

         showTextThread = new Thread(this);

         File filePath = new File(file_path);
         if (!filePath.exists()) {
             Log.i(TAG, "----------ERROR----------");
         }
     }

     Handler myHandler = new Handler() {
         public void handleMessage(Message msg) {
             show_text_tv.setText(String.valueOf(testChar));
             super.handleMessage(msg);
         }
     };

     @Override
     public void onClick(View v) {
         switch (v.getId()) {
             case R.id.start_service_btn:
                 if (showTextThread.isAlive()) {
                     isRun = false;
                     showTextThread.interrupt();
                 }
                 showTextThread = new Thread(this);
                 showTextThread.start();
                 isRun = true;

 //                startService(new Intent(this, ScreenCaptureService.class));
 //                this.finish();
                 break;
             default:
                 break;
         }
     }

     @Override
     public void run() {
 //        List<String> lines = new ArrayList<>();
 //        BufferedReader br = null;
 //        try {
 //            File file = new File(fileName);
 //            InputStream inputStream = new FileInputStream(file);
 //            Reader reader = new InputStreamReader(inputStream, "GBK");
 //            br = new BufferedReader(reader);
 //        } catch (UnsupportedEncodingException | FileNotFoundException e) {
 //            e.printStackTrace();
 //        }
 //
 //        try {
 //            while ((readerString = br.readLine()) != null) {
 //                lines.add(readerString);
 //                myHandler.sendEmptyMessage(0);
 //                Log.i(TAG, readerString);
 //                Thread.sleep(200);
 //            }
 //            br.close();
 //        } catch (IOException | InterruptedException e) {
 //            e.printStackTrace();
 //        }

         File file = new File(fileName);
         BufferedReader reader;
         String text = "";
         try {
             FileInputStream fis = new FileInputStream(file);
             BufferedInputStream in = new BufferedInputStream(fis);
             in.mark(4);
             byte[] first3bytes = new byte[3];
             in.read(first3bytes);//找到文档的前三个字节并自动判断文档类型。
             in.reset();
             if (first3bytes[0] == (byte) 0xEF && first3bytes[1] == (byte) 0xBB && first3bytes[2] == (byte) 0xBF) {// utf-8
                 reader = new BufferedReader(new InputStreamReader(in, "utf-8"));
             } else if (first3bytes[0] == (byte) 0xFF && first3bytes[1] == (byte) 0xFE) {
                 reader = new BufferedReader(new InputStreamReader(in, "unicode"));
             } else if (first3bytes[0] == (byte) 0xFE && first3bytes[1] == (byte) 0xFF) {
                 reader = new BufferedReader(new InputStreamReader(in, "utf-16be"));
             } else if (first3bytes[0] == (byte) 0xFF && first3bytes[1] == (byte) 0xFF) {
                 reader = new BufferedReader(new InputStreamReader(in, "utf-16le"));
             } else {
                 reader = new BufferedReader(new InputStreamReader(in, "GBK"));
             }

             readerString = reader.readLine();
             while (readerString != null) {
                 if (isRun) {
                     for (int i = 0; i < readerString.length(); i++) {// 遍历字符串每一个字符

                         // 使用正则表达式判断字符是否属于汉字编码
                         Pattern p = Pattern.compile("[\u4e00-\u9fa5]");
                         Matcher m = p.matcher(readerString);
                         if (m.find()) {// 如果是汉字
                             testChar = readerString.charAt(i);
                             Log.i(TAG, "testChar: " + testChar);
                             myHandler.sendEmptyMessage(0);
                         }

                         Thread.sleep(300);

 //                    String[] splitStr = readerString.split("[\\s,.;。，；]");
 //                    for (String str : splitStr) {
 //                        if (!str.trim().equals("")) {
 //                            testChar = str.trim();
 //                            Log.i(TAG, "testChar: " + testChar);
 //                            myHandler.sendEmptyMessage(0);
 //                            Thread.sleep(400);
 //                        }
 //                    }

 //                    StringBuffer english = new StringBuffer();
 //                    String regex = "[^\u4e00-\u9fa5。，？”“《》：！——-、]";
 //                    Pattern pattern = Pattern.compile(regex);
 //                    Matcher matcher = pattern.matcher(readerString);
 //                    while (matcher.find()) {
 //                        testChar = null;
 //                        english.append(matcher.group(1));
 //                        testChar = english.toString();
 //                        Log.i(TAG, "testChar: " + testChar);
 //                        myHandler.sendEmptyMessage(0);
 //                    }

                     }
                 }
                 readerString = reader.readLine();
             }
             reader.close();
         } catch (IOException | InterruptedException e) {
             e.printStackTrace();
         }
     }

     @Override
     public boolean onKeyDown(int keyCode, KeyEvent event) {
         if (keyCode == KeyEvent.KEYCODE_BACK) {
             isRun = false;
             this.finish();
         }
         return super.onKeyDown(keyCode, event);
     }

     @Override
     protected void onDestroy() {
         super.onDestroy();
         isRun = false;
         Toast.makeText(getApplicationContext(), "MainActivity onDestroy", Toast.LENGTH_SHORT).show();
     }

 }