今天主要來提提RecongnizerIntent(語音輸入)的功能，無論是在Google或是許多應用程式中常常看見的功能，那麼馬上就開始實作！(今日無依賴&權限需添加。)

UI

首先先設計UI的畫面，textView->顯示語音輸入的文字，ImageButton->呼叫語音輸入的功能。

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.022" />

    <ImageButton
        android:id="@+id/speak"
        android:layout_width="100dp"
        android:layout_height="100dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:srcCompat="@android:drawable/presence_audio_online"
        android:scaleType="centerCrop"
        android:background="#00FF"/>

</androidx.constraintlayout.widget.ConstraintLayout>

語音輸入

接著進到語音輸入的部分，主要可透過Intent方式來進行，有關於RecognizerIntent.ACTION_RECOGNIZE_SPEECH，官方給的解釋是：啟動一個提示用戶語音並通過語音識別器發送的活動，這樣我就可以開始進行語音輸入，另外也有許多可以設定的資料，像是顯示文本或是語音模型等等，查看更多：Android Developers/RecognizerIntent。

//語音輸入Intent
Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
//語音模型
intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
//用戶說話時顯示的文本
intent.putExtra(RecognizerIntent.EXTRA_PROMPT, "請說!");
startActivityForResult(intent,200);

另外你在跳轉頁面後，也會需要去接你的語音文字，會用到onActivityResult這個方法，爾後就開始進行設計：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if(requestCode == 200){
        //...資料處裡
    }
}

程式

public class MainActivity extends AppCompatActivity {
    private TextView textView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textView = (TextView) this.findViewById(R.id.text);
        ImageView speak = (ImageView) findViewById(R.id.speak);
        speak.setOnClickListener(view->{
            Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
            intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
            intent.putExtra(RecognizerIntent.EXTRA_PROMPT, "請說!");
            try{
                startActivityForResult(intent,200);
            }catch (ActivityNotFoundException a){
                Toast.makeText(getApplicationContext(),"Intent problem", Toast.LENGTH_SHORT).show();
            }
        });
    }
    //回傳資料
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode == 200){
            if(resultCode == RESULT_OK && data != null){
                ArrayList<String> result = data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
                textView.setText(result.get(0));
            }
        }
    }
}

成果