Offline Android Text‑to‑Speech without Third‑Party SDKs

Goal

Implement offline speech synthesis on Android without third‑party SDKs.

UI Layout

Create a layout containing an EditText (input text) and a Button (trigger). Assign id attributes to both widgets.

Activity Code

Button button = (Button) findViewById(R.id.button);
EditText editText = (EditText) findViewById(R.id.editTextTextPersonName2);
button.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        SpeechUtils.getInstance(LoginActivity.this)
                   .speakText(editText.getText().toString());
    }
});

The click handler retrieves the text from the EditText and forwards it to SpeechUtils.

SpeechUtils Singleton

import android.content.Context;
import android.speech.tts.TextToSpeech;
import java.util.Locale;

public class SpeechUtils {
    private static SpeechUtils singleton;
    private TextToSpeech textToSpeech;

    public static SpeechUtils getInstance(Context context) {
        if (singleton == null) {
            synchronized (SpeechUtils.class) {
                if (singleton == null) {
                    singleton = new SpeechUtils(context);
                }
            }
        }
        return singleton;
    }

    private SpeechUtils(Context context) {
        textToSpeech = new TextToSpeech(context, new TextToSpeech.OnInitListener() {
            @Override
            public void onInit(int status) {
                if (status == TextToSpeech.SUCCESS) {
                    textToSpeech.setLanguage(Locale.CHINA);
                    textToSpeech.setPitch(1.5f); // higher = higher‑pitched (female‑like) voice
                    textToSpeech.setSpeechRate(0.5f); // slower for clearer articulation
                }
            }
        });
    }

    public void speakText(String text) {
        if (textToSpeech != null) {
            textToSpeech.speak(text, TextToSpeech.QUEUE_FLUSH, null);
        }
    }
}

The class uses double‑checked locking to ensure a single TextToSpeech instance. Initialization configures language, pitch, and speech rate.

Usage Note

When invoking the utility from an Activity, pass the activity context as ActivityName.this (e.g., LoginActivity.this) to avoid referencing the inner OnClickListener object.

SpeechUtils.getInstance(LoginActivity.this).speakText(editText.getText().toString());

Language Support

Older discussions claimed Chinese was unsupported; recent Android versions include it. Set the language with:

textToSpeech.setLanguage(Locale.CHINA);

Additional Properties

textToSpeech.setPitch(1.5f); // higher value yields higher‑pitched voice

textToSpeech.setSpeechRate(0.5f); // slower rate improves intelligibility

Reference Documentation

Android official TextToSpeech API reference: https://developer.android.google.cn/reference/android/speech/tts/TextToSpeech

Demo Project

Download the complete demo archive from:

https://files.cnblogs.com/files/badaoliumangqizhi/%E8%AF%AD%E9%9F%B3%E6%92%AD%E6%8A%A5.rar