Android uses AsyncTask asynchronous class to enlarge and reduce web content

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public class WebActivity extends Activity {
 //Web browser private WebView webView;
 //Progress bar layout and web content main layout private RelativeLayout loadingLayout,webLayout;
 //Zoom in and out the controller private ZoomControls zoomControls; 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 (savedInstanceState);
 setContentView();
 //Initialize the page component webView = (WebView)findViewById();
 loadingLayout = (RelativeLayout)findViewById();
 webLayout = (RelativeLayout)findViewById();
 zoomControls = (ZoomControls)findViewById(); 
 WebSettings webSettings = ();
 //Setting can use js script (true);
 //Execute asynchronous process new MyAsyncTask().execute(""); 
 }
 private void reading(){
 String filePath = getIntent().getStringExtra("filePath");
 if (filePath != null) {
  //Read the file  (readWebDataToStringFromPath(filePath, new FileReadOverBack() {
  @Override
  public void fileReadOver() {
  }
  }), "text/html", HTTP.UTF_8);
 } else {
  new ().setTitle("What went wrong").setMessage("There was an error in obtaining the file path!").setPositiveButton("return", new OnClickListener() {
  @Override
  public void onClick(DialogInterface dialog, int which) {
   ();
  }
  });
 }
 }
 //Read web page data into a string variable private String readWebDataToStringFromPath(String path,final FileReadOverBack fileReadOverBack){
 File file = new File(path);
 StringBuffer stringBuffer = new StringBuffer();
 try {
  //Read the file content  FileInputStream inputStream = new FileInputStream(file);
  byte[] bytes = new byte[1024];
  int readCount = 0;
  while ((readCount = (bytes)) > 0) {
  (new String(bytes, 0, readCount));
  }
  ();
 } catch (FileNotFoundException e) {
  return "The file does not exist!";
 } catch (IOException e) {
  return "File reading error!";
 }
 return ();
 } 
 interface FileReadOverBack{
 void fileReadOver();
 }
 //Asynchronous processing class class MyAsyncTask extends AsyncTask<String, String, String>{
 //The function executed first @Override
 protected void onPreExecute() {
  ();
  ();
  ();
 }
 //Background execution @Override
 protected String doInBackground(String... params) {
  reading();
  return null;
 } 
 @Override
 protected void onPostExecute(String result) {
  (result);
  //Set the load progress bar to hide  ();
  //Set the browser content to be visible  ();  
  // Zoom in button  (new () {
  //Enlarge the content of the web page  @Override
  public void onClick(View v) {
   ();
  }
  });
  // Zoom out button  (new () { 
  //Shrink the content of the web page  @Override
  public void onClick(View v) {
   ();
  }
  });
 } 
 }
}