In the below code I have used SpellCheckerListener interface and ovrride its method. Here I have created SpellCheckerListener class to check the spelling errors. See the below code it will clearly described how to make Spelling Checker function.

public class MainActivity extends Activity implements SpellCheckerSessionListener  {
   Button b1;
   TextView tv1;
   EditText ed1;
   private SpellCheckerSession mScs;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);

      b1=(Button)findViewById(R.id.button);
      tv1=(TextView)findViewById(R.id.textView3);

      ed1=(EditText)findViewById(R.id.editText);
      b1.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
            Toast.makeText(getApplicationContext(), ed1.getText().toString(),Toast.LENGTH_SHORT).show();
            mScs.getSuggestions(new TextInfo(ed1.getText().toString()), 3);
         }
      });
   }

   public void onResume() {
      super.onResume();
      final TextServicesManager tsm = (TextServicesManager) getSystemService(Context.TEXT_SERVICES_MANAGER_SERVICE);
      mScs = tsm.newSpellCheckerSession(null, null, this, true);
   }

   public void onPause() {
      super.onPause();
      if (mScs != null) {
         mScs.close();
      }
   }

   public void onGetSuggestions(final SuggestionsInfo[] arg0) {
      final StringBuilder sb = new StringBuilder();

      for (int i = 0; i < arg0.length; ++i) {
         final int len = arg0[i].getSuggestionsCount();
         sb.append('\n');

         for (int j = 0; j < len; ++j) {
            sb.append("," + arg0[i].getSuggestionAt(j));
         }

         sb.append(" (" + len + ")");
      }
      runOnUiThread(new Runnable() {
         public void run() {
            tv1.append(sb.toString());
         }
      });
   }

   @Override
   public void onGetSentenceSuggestions(SentenceSuggestionsInfo[] arg0) {
   }

   @Override
   public boolean onCreateOptionsMenu(Menu menu) {
      getMenuInflater().inflate(R.menu.menu_main, menu);
      return true;
   }

   @Override
   public boolean onOptionsItemSelected(MenuItem item) {

      int id = item.getItemId();

      //noinspection SimplifiableIfStatement
      if (id == R.id.action_settings) {
         return true;
      }
      return super.onOptionsItemSelected(item);
   }
}