Android Speech To Text Example

1. MainActivity.XML

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/speechtotext"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:textAlignment="center"
        android:text="Hello "
        android:textSize="25sp"
        android:textStyle="bold"
        android:textColor="@android:color/black" />

    <ImageButton
        android:id="@+id/mike"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

2. MainActivity.java

public class MainActivity extends AppCompatActivity {

    ImageButton mike;
    TextView speechtotext;

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

        speechtotext = (TextView) findViewById(R.id.speechtotext);
        mike = (ImageButton) findViewById(R.id.mike);

        mike.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                speech();
            }
        });
    }

    private void speech() {
        Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
        intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
                RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
        intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE, Locale.getDefault());
        intent.putExtra(RecognizerIntent.EXTRA_PROMPT, "Hi Speak Something");

        try {

            startActivityForResult(intent, 1000);

        }catch (Exception ex){
            //Toast.makeText(MainActivity.this, ""+ex.getMessage(), Toast.LENGTH_SHORT).show();
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        switch (requestCode){
            case 1000:
                if(resultCode == RESULT_OK && data != null){
                    ArrayList<String> result = data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
                    speechtotext.setText(result.get(0));
                }
                default:
        }
    }
}