要实现Android应用程序的语音/文本调用功能，你可以使用Android的语音识别和文本转语音功能。

首先，在你的Android项目中添加以下权限到AndroidManifest.xml文件中：

然后，创建一个按钮或其他用户界面元素，当用户点击时触发调用操作。

接下来，你可以使用以下代码示例来实现语音输入和文本转语音功能：

import android.Manifest;
import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.speech.RecognizerIntent;
import android.speech.tts.TextToSpeech;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.Locale;

public class MainActivity extends AppCompatActivity implements TextToSpeech.OnInitListener {

    private static final int REQ_CODE_SPEECH_INPUT = 100;

    private TextToSpeech textToSpeech;
    private Button callButton;

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

        callButton = findViewById(R.id.call_button);

        // 请求录音权限
        ActivityCompat.requestPermissions(this, new String[] {Manifest.permission.RECORD_AUDIO}, 1);

        // 初始化TextToSpeech对象
        textToSpeech = new TextToSpeech(this, this);

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

    // 启动语音识别
    private void promptSpeechInput() {
        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, "说出电话号码或联系人名称");
        try {
            startActivityForResult(intent, REQ_CODE_SPEECH_INPUT);
        } catch (ActivityNotFoundException e) {
            Toast.makeText(this, "抱歉，您的设备不支持语音识别功能！", Toast.LENGTH_SHORT).show();
        }
    }

    // 获取语音识别结果
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        switch (requestCode) {
            case REQ_CODE_SPEECH_INPUT: {
                if (resultCode == RESULT_OK && null != data) {
                    ArrayList result = data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
                    String spokenText = result.get(0);
                    makeCall(spokenText);
                }
                break;
            }
        }
    }

    // 拨打电话
    private void makeCall(String phoneNumber) {
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
            return;
        }
        startActivity(new Intent(Intent.ACTION_CALL, Uri.parse("tel:" + phoneNumber)));
    }

    @Override
    public void onInit(int status) {
        if (status == TextToSpeech.SUCCESS) {
            int result = textToSpeech.setLanguage(Locale.getDefault());

            if (result == TextToSpeech.LANG_MISSING_DATA || result == TextToSpeech.LANG_NOT_SUPPORTED) {
                Toast.makeText(this, "抱歉，您的设备不支持语音转文本功能！", Toast.LENGTH_SHORT).show();
            } else {
                textToSpeech.speak("请说出电话号码或联系人名称", TextToSpeech.QUEUE_FLUSH, null);
            }
        } else {
            Toast.makeText(this, "抱歉，初始化语音转文本功能失败！", Toast.LENGTH_SHORT).show();
        }
    }

    @Override
    public void onDestroy() {
        if (textToSpeech != null) {
            textToSpeech.stop();
            textToSpeech.shutdown();
        }
        super.onDestroy();
    }
}

这个示例代码中，首先我们在onCreate方法中初始化了TextToSpeech对象，并在onInit方法中设置了语音转文本功能。然后，当用户点击按钮时，调用promptSpeechInput方法启动语音识别功能。在onActivityResult方法中获取识别结果，并调用makeCall方法拨打电话。

请注意，这个示例中