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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/btn_control"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Start Recording" />

</RelativeLayout>

public class MainActivity extends AppCompatActivity {

    private Button btn_control;
    private boolean isStart = false;
    private MediaRecorder mr = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn_control = (Button) findViewById(R.id.btn_control);
        btn_control.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(!isStart){
                    startRecord();
                    btn_control.setText("Stop Recording");
                    isStart = true;
                }else{
                    stopRecord();
                    btn_control.setText("Start Recording");
                    isStart = false;
                }
            }
        });
    }

    // Start recording
    private void startRecord(){
        if(mr == null){
            File dir = new File(Environment.getExternalStorageDirectory(),"sounds");
            if(!dir.exists()){
                dir.mkdirs();
            }
            File soundFile = new File(dir,System.currentTimeMillis()+".amr");
            if(!soundFile.exists()){
                try {
                    soundFile.createNewFile();
                } catch (IOException e) {
                    e.printStackTrace();
                }

            }
            mr = new MediaRecorder();
            mr.setAudioSource(MediaRecorder.AudioSource.MIC);  // Audio source
            mr.setOutputFormat(MediaRecorder.OutputFormat.AMR_WB);   // Set output format
            mr.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_WB);   // Set encoding format
            mr.setOutputFile(soundFile.getAbsolutePath());
            try {
                mr.prepare();
                mr.start();  // Start recording
            } catch (IOException e) {
                e.printStackTrace();
            }

        }
    }

    // Stop recording and release resources
    private void stopRecord(){
        if(mr != null){
            mr.stop();
            mr.release();
            mr = null;
        }
    }
}

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.RECORD_AUDIO"/>