編集履歴

回答編集履歴

パーミッション関係および Pause/Resume 時の動作等のコード修正

2021/10/05 14:21

投稿

スコア12648

test CHANGED Viewed

@@ -24,23 +24,31 @@
-import androidx.annotation.NonNull;
+import androidx.activity.result.ActivityResultLauncher;
+import androidx.activity.result.contract.ActivityResultContracts;
-import androidx.appcompat.app.AppCompatActivity;
+import androidx.appcompat.app.*;
 import androidx.core.content.ContextCompat;
+import androidx.fragment.app.DialogFragment;
 import android.Manifest;
+import android.app.Dialog;
 import android.content.pm.PackageManager;
 import android.media.*;
 import android.os.*;
+import android.view.Gravity;
-import android.widget.Button;
+import android.widget.*;
@@ -52,10 +60,6 @@
-  private static final int PERMISSIONS_REQUEST_RECORD_AUDIO = 99;
   private static final int AUDIO_SAMPLE_FREQ = 44100;//サンプリング周波数
   private static final int FRAME_RATE = 10;
@@ -66,6 +70,8 @@
+  private SurfaceDrawer surfaceDrawer;
   private Button button;
   private HandlerThread listenerThread;
@@ -84,9 +90,135 @@
-    SurfaceDrawer surfaceDrawer = new SurfaceDrawer(findViewById(R.id.surfaceView));
+    surfaceDrawer = new SurfaceDrawer(findViewById(R.id.surfaceView));
+    button = findViewById(R.id.button);
+    button.setEnabled(true);
+    button.setText(START_TEXT);
+    button.setOnClickListener(v -> {
+      switch(button.getText().toString()) { //トグル
+        case START_TEXT:
+          permissionCheckAndStart();
+          break;
+        case STOP_TEXT:
+          recorder.stop();
+          button.setText(START_TEXT);
+          break;
+      }
+    });
+  }
+  //権限要求ダイアログ表示・返答受付
+  private final ActivityResultLauncher<String> requestPermissionLauncher =
+          registerForActivityResult(new ActivityResultContracts.RequestPermission(), isGranted -> {
+            if (isGranted) {
+              start();
+            } else {
+              Toast t = Toast.makeText(this, "権限が許可されなかった為、実行できません。", Toast.LENGTH_LONG);
+              t.setGravity(Gravity.CENTER, 0, 0);
+              t.show();
+            }
+          });
+  //権限説明ダイアログ  ok 押下 → 権限要求ダイアログ
+  public static class ExplainDialogFragment extends DialogFragment {
+    @Override
+    public Dialog onCreateDialog(Bundle savedInstanceState) {
+      MainActivity activity = (MainActivity)requireActivity();
+      return new AlertDialog.Builder(activity)
+              .setTitle("使用許可の説明")
+              .setMessage("音声波形を表示するにはマイクの使用(「音声の録音」)の許可が必要です")
+              .setNeutralButton(android.R.string.cancel, (dialog,which)->{})
+              .setPositiveButton(android.R.string.ok, (dialog,which)->{
+                  activity.requestPermissionLauncher.launch(Manifest.permission.RECORD_AUDIO);
+              })
+              .create();
+    }
+  }
+  //権限チェック
+  private void permissionCheckAndStart() {
+    if(ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) == PackageManager.PERMISSION_GRANTED) {
+      start();
+    } else if (shouldShowRequestPermissionRationale(Manifest.permission.RECORD_AUDIO)) {
+      new ExplainDialogFragment().show(getSupportFragmentManager(), "Explain");
+    } else {
+      requestPermissionLauncher.launch(Manifest.permission.RECORD_AUDIO);
+    }
+  }
+  //波形表示開始
+  private void start() {
+    if(recorder == null) initialize();
+    recorder.startRecording();
+    button.setText(STOP_TEXT);
+  }
+  private void initialize() {
     int frameBufferSize = AUDIO_SAMPLE_FREQ / FRAME_RATE;
@@ -110,6 +242,8 @@
       public void onMarkerReached(AudioRecord recorder) {}
       @Override
       public void onPeriodicNotification(AudioRecord recorder) {
@@ -122,123 +256,305 @@
     }, new Handler(listenerThread.getLooper())); //HandlerThread でリスナを実行
-    button = findViewById(R.id.button);
-    button.setText(START_TEXT);
-    button.setEnabled(false);
-    button.setOnClickListener(v -> {
-      switch(button.getText().toString()) { //トグル
-        case START_TEXT:
+  }
-          recorder.startRecording();
+  private void terminate() {
-          button.setText(STOP_TEXT);
-          break;
-        case STOP_TEXT:
+    if(recorder != null) {
-          recorder.stop();
+      recorder.stop();
-          button.setText(START_TEXT);
-          break;
-      }
-    });
-    int permissionCheck = ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO);
-    if(permissionCheck == PackageManager.PERMISSION_GRANTED) { // すでにユーザーがパーミッションを許可
-      button.setEnabled(true);
+      recorder.release();
-    } else { // ユーザーはパーミッションを許可していない
-      requestPermissions(new String[]{Manifest.permission.RECORD_AUDIO}, PERMISSIONS_REQUEST_RECORD_AUDIO);
     }
+    recorder = null;
+    if(listenerThread != null) listenerThread.quit();
+    listenerThread = null;
+  }
+  private AudioRecord settingRecorder(int sampleRateInHz, int channelConfig, int audioFormat, int frameBufferSize) {
+    int minBufferSize = AudioRecord.getMinBufferSize(sampleRateInHz, channelConfig, audioFormat);
+    if(minBufferSize == AudioRecord.ERROR_BAD_VALUE) throw new IllegalArgumentException();
+    if(minBufferSize == AudioRecord.ERROR) throw new IllegalStateException("minBufferSize");
+    int bufferSizeInBytes = Math.max(minBufferSize, frameBufferSize*10); //"*10"は余裕分
+    AudioRecord recorder = new AudioRecord(MediaRecorder.AudioSource.MIC, sampleRateInHz, channelConfig, audioFormat, bufferSizeInBytes);
+    if(recorder.getState() != AudioRecord.STATE_INITIALIZED) throw new IllegalStateException("recorder.getState");
+    if(recorder.setPositionNotificationPeriod(frameBufferSize) != AudioRecord.SUCCESS) throw new IllegalStateException("setPositionNotificationPeriod frameBufferSize="+frameBufferSize);
+    return recorder;
   }
   @Override
-  public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
-    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
-    if(requestCode == PERMISSIONS_REQUEST_RECORD_AUDIO) {
+  protected void onPause() { //停止
-      if(grantResults[0] != PackageManager.PERMISSION_GRANTED) { // ユーザが許可しなかったらアプリを終了する
+    super.onPause();
-        finish();
+    terminate();
-      }
+  }
+  @Override
+  protected void onResume() { //再開
+    super.onResume();
+    if(button.getText().toString().equals(STOP_TEXT)) { //実行中だった
-      button.setEnabled(true);
+      permissionCheckAndStart();
     }
   }
+}
+```
+レイアウト: activity_main.xml
+```xml
+<?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">
+  <SurfaceView
+      android:id="@+id/surfaceView"
+      android:layout_width="0dp"
+      android:layout_height="0dp"
+      app:layout_constraintBottom_toTopOf="@id/button"
+      app:layout_constraintLeft_toLeftOf="parent"
+      app:layout_constraintRight_toRightOf="parent"
+      app:layout_constraintTop_toTopOf="parent" />
+  <Button
+      android:id="@+id/button"
+      android:layout_width="0dp"
+      android:layout_height="wrap_content"
+      android:text="START"
+      android:layout_margin="10dp"
+      app:layout_constraintBottom_toBottomOf="parent"
+      app:layout_constraintLeft_toLeftOf="parent"
+      app:layout_constraintRight_toRightOf="parent" />
+</androidx.constraintlayout.widget.ConstraintLayout>
+```
+SurfaceDrawer.java
+```java
+package com.teratail.q362100;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.Path;
+import android.util.Log;
+import android.view.SurfaceHolder;
+import android.view.SurfaceView;
+public class SurfaceDrawer implements SurfaceHolder.Callback {
+  @SuppressWarnings("UnusedDeclaration")
+  private static final String TAG = "SurfaceDrawer";
+  private static final float COMPRESSION_RATE = 10f;
+  private SurfaceHolder holder;
+  private float canvasWidth, canvasVerticalCenter;
+  private final Paint pathPaint;
+  private final Path path = new Path();
+  public SurfaceDrawer(SurfaceView surfaceView) {
+    holder = surfaceView.getHolder();
+    holder.addCallback(this);
+    pathPaint = new Paint();
+    pathPaint.setAntiAlias(true);
+    pathPaint.setStrokeWidth(2);//線幅
+    pathPaint.setStyle(Paint.Style.STROKE);
+    pathPaint.setColor(Color.GREEN);
+  }
   @Override
-  protected void onDestroy() {
-    super.onDestroy();
-    if(listenerThread != null) listenerThread.quit();
-    listenerThread = null;
-    if(recorder != null) recorder.release();
-    recorder = null;
-  }
-  private AudioRecord settingRecorder(int sampleRateInHz, int channelConfig, int audioFormat, int frameBufferSize) {
-    int minBufferSize = AudioRecord.getMinBufferSize(sampleRateInHz, channelConfig, audioFormat);
-    if(minBufferSize == AudioRecord.ERROR_BAD_VALUE) throw new IllegalArgumentException();
-    if(minBufferSize == AudioRecord.ERROR) throw new IllegalStateException("minBufferSize");
-    int bufferSizeInBytes = Math.max(minBufferSize, frameBufferSize*10); //"*10"は余裕分
-    AudioRecord recorder = new AudioRecord(MediaRecorder.AudioSource.MIC, sampleRateInHz, channelConfig, audioFormat, bufferSizeInBytes);
-    if(recorder.getState() != AudioRecord.STATE_INITIALIZED) throw new IllegalStateException("recorder.getState");
-    if(recorder.setPositionNotificationPeriod(frameBufferSize) != AudioRecord.SUCCESS) throw new IllegalStateException("setPositionNotificationPeriod frameBufferSize="+frameBufferSize);
-    return recorder;
+  public void surfaceCreated(SurfaceHolder holder) {
+    //Log.d(TAG, "surfaceCreated");
+    Canvas canvas = holder.lockCanvas();
+    if(canvas == null) return;
+    canvas.drawColor(Color.BLACK);
+    holder.unlockCanvasAndPost(canvas);
+  }
+  @Override
+  public void surfaceChanged(SurfaceHolder holder, int f, int w, int h) {
+    //Log.d(TAG, "surfaceChanged w="+w+", h="+h);
+    canvasWidth = w;
+    canvasVerticalCenter = h / 2f;
+  }
+  @Override
+  public void surfaceDestroyed(SurfaceHolder holder) {
+    //Log.d(TAG, "surfaceDestroyed");
+  }
+  public void draw(short[] data) {
+    if(data == null || data.length < 2) return;
+    Canvas canvas = holder.lockCanvas();
+    if(canvas == null) {
+      Log.d(TAG, "holder.lockCanvas() is null.");
+      return;
+    }
+    canvas.drawColor(Color.BLACK); //塗り潰し
+    path.rewind();
+    path.moveTo(0, canvasVerticalCenter + data[0] / COMPRESSION_RATE);
+    for(int x=1; x<canvasWidth; x++) {
+      path.lineTo(x, canvasVerticalCenter + data[(int)(data.length / canvasWidth * x)] / COMPRESSION_RATE);
+    }
+    canvas.drawPath(path, pathPaint);
+    holder.unlockCanvasAndPost(canvas);
   }
@@ -246,348 +562,20 @@
 ```
+app/build.gradle
+ dependencies に追加
+```plain
+  implementation 'androidx.activity:activity:1.3.1'
+```
-レイアウト: activity_main.xml
+AndroidManifest.xml 追加
 ```xml
-<?xml version="1.0" encoding="utf-8"?>
+  <uses-permission android:name="android.permission.RECORD_AUDIO" />
-<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">
-  <SurfaceView
-      android:id="@+id/surfaceView"
-      android:layout_width="0dp"
-      android:layout_height="0dp"
-      app:layout_constraintBottom_toTopOf="@id/button"
-      app:layout_constraintLeft_toLeftOf="parent"
-      app:layout_constraintRight_toRightOf="parent"
-      app:layout_constraintTop_toTopOf="parent" />
-  <Button
-      android:id="@+id/button"
-      android:layout_width="0dp"
-      android:layout_height="wrap_content"
-      android:text="START"
-      android:layout_margin="10dp"
-      app:layout_constraintBottom_toBottomOf="parent"
-      app:layout_constraintLeft_toLeftOf="parent"
-      app:layout_constraintRight_toRightOf="parent" />
-</androidx.constraintlayout.widget.ConstraintLayout>
 ```
-SurfaceDrawer.java
-```java
-package com.teratail.q362100;
-import android.graphics.Canvas;
-import android.graphics.Color;
-import android.graphics.Paint;
-import android.graphics.Path;
-import android.view.SurfaceHolder;
-import android.view.SurfaceView;
-public class SurfaceDrawer implements SurfaceHolder.Callback {
-  @SuppressWarnings("UnusedDeclaration")
-  private static final String TAG = "SurfaceDrawer";
-  private static final float COMPRESSION_RATE = 10f;
-  private SurfaceHolder holder;
-  private float canvasWidth, canvasVerticalCenter;
-  private final Paint pathPaint;
-  private final Path path = new Path();
-  public SurfaceDrawer(SurfaceView surfaceView) {
-    holder = surfaceView.getHolder();
-    holder.addCallback(this);
-    pathPaint = new Paint();
-    pathPaint.setAntiAlias(true);
-    pathPaint.setStrokeWidth(2);//線幅
-    pathPaint.setStyle(Paint.Style.STROKE);
-    pathPaint.setColor(Color.GREEN);
-  }
-  @Override
-  public void surfaceCreated(SurfaceHolder holder) {
-    Canvas canvas = holder.lockCanvas();
-    if(canvas == null) return;
-    canvas.drawColor(Color.BLACK);
-    holder.unlockCanvasAndPost(canvas);
-  }
-  @Override
-  public void surfaceChanged(SurfaceHolder holder, int f, int w, int h) {
-    canvasWidth = w;
-    canvasVerticalCenter = h / 2f;
-  }
-  @Override
-  public void surfaceDestroyed(SurfaceHolder holder) {
-    this.holder = null;
-  }
-  public void draw(short[] data) {
-    if(data == null || data.length < 2) return;
-    Canvas canvas = holder.lockCanvas();
-    if(canvas == null) return;
-    canvas.drawColor(Color.BLACK); //塗り潰し
-    path.rewind();
-    path.moveTo(0, canvasVerticalCenter + data[0] / COMPRESSION_RATE);
-    for(int x=1; x<canvasWidth; x++) {
-      path.lineTo(x, canvasVerticalCenter + data[(int)(data.length / canvasWidth * x)] / COMPRESSION_RATE);
-    }
-    canvas.drawPath(path, pathPaint);
-    holder.unlockCanvasAndPost(canvas);
-  }
-}
-```
-app/build.gradle
-```plain
-plugins {
-    id 'com.android.application'
-}
-android {
-    compileSdk 30
-    defaultConfig {
-        applicationId "com.teratail.q362100"
-        minSdk 29
-        targetSdk 30
-        versionCode 1
-        versionName "1.0"
-        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
-    }
-    buildTypes {
-        release {
-            minifyEnabled false
-            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
-        }
-    }
-    compileOptions {
-        sourceCompatibility JavaVersion.VERSION_1_8
-        targetCompatibility JavaVersion.VERSION_1_8
-    }
-}
-dependencies {
-    implementation 'androidx.appcompat:appcompat:1.3.1'
-    implementation 'com.google.android.material:material:1.4.0'
-    implementation 'androidx.constraintlayout:constraintlayout:2.1.1'
-    testImplementation 'junit:junit:4.+'
-    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
-    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
-}
-```
-AndroidManifest.xml
-```xml
-<?xml version="1.0" encoding="utf-8"?>
-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.teratail.q362100">
-  <uses-permission android:name="android.permission.RECORD_AUDIO" />
-  <application
-      android:allowBackup="true"
-      android:icon="@mipmap/ic_launcher"
-      android:label="@string/app_name"
-      android:roundIcon="@mipmap/ic_launcher_round"
-      android:supportsRtl="true"
-      android:theme="@style/Theme.Q362100">
-    <activity
-        android:name=".MainActivity"
-        android:exported="true">
-      <intent-filter>
-        <action android:name="android.intent.action.MAIN" />
-        <category android:name="android.intent.category.LAUNCHER" />
-      </intent-filter>
-    </activity>
-  </application>
-</manifest>
-```

settingRecorder() 修正、AndroidManifest.xml 追加

2021/10/05 14:21

投稿

jimbe

スコア12648

test CHANGED Viewed

@@ -220,7 +220,7 @@
     if(minBufferSize == AudioRecord.ERROR_BAD_VALUE) throw new IllegalArgumentException();
-    if(minBufferSize == AudioRecord.ERROR) throw new IllegalStateException();
+    if(minBufferSize == AudioRecord.ERROR) throw new IllegalStateException("minBufferSize");
@@ -230,11 +230,11 @@
     AudioRecord recorder = new AudioRecord(MediaRecorder.AudioSource.MIC, sampleRateInHz, channelConfig, audioFormat, bufferSizeInBytes);
-    if(recorder.getState() != AudioRecord.STATE_INITIALIZED) throw new IllegalStateException();
+    if(recorder.getState() != AudioRecord.STATE_INITIALIZED) throw new IllegalStateException("recorder.getState");
-    if(recorder.setPositionNotificationPeriod(frameBufferSize) != AudioRecord.SUCCESS) throw new IllegalStateException();
+    if(recorder.setPositionNotificationPeriod(frameBufferSize) != AudioRecord.SUCCESS) throw new IllegalStateException("setPositionNotificationPeriod frameBufferSize="+frameBufferSize);
@@ -535,3 +535,59 @@
 }
 ```
+AndroidManifest.xml
+```xml
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.teratail.q362100">
+  <uses-permission android:name="android.permission.RECORD_AUDIO" />
+  <application
+      android:allowBackup="true"
+      android:icon="@mipmap/ic_launcher"
+      android:label="@string/app_name"
+      android:roundIcon="@mipmap/ic_launcher_round"
+      android:supportsRtl="true"
+      android:theme="@style/Theme.Q362100">
+    <activity
+        android:name=".MainActivity"
+        android:exported="true">
+      <intent-filter>
+        <action android:name="android.intent.action.MAIN" />
+        <category android:name="android.intent.category.LAUNCHER" />
+      </intent-filter>
+    </activity>
+  </application>
+</manifest>
+```

コード微量修正

2021/10/05 02:59

投稿

jimbe

スコア12648

test CHANGED Viewed

@@ -24,6 +24,8 @@
+import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.core.content.ContextCompat;
@@ -44,6 +46,8 @@
 public class MainActivity extends AppCompatActivity {
+  @SuppressWarnings("UnusedDeclaration")
   private static final String TAG = "MainActivity";
@@ -62,12 +66,12 @@
-  private short audioData[];
   private Button button;
   private HandlerThread listenerThread;
+  private AudioRecord recorder;
   public void onCreate(Bundle bundle) {
@@ -86,11 +90,11 @@
     int frameBufferSize = AUDIO_SAMPLE_FREQ / FRAME_RATE;
-    audioData = new short[frameBufferSize];
+    short[] audioData = new short[frameBufferSize];
-    AudioRecord recorder = settingRecorder(AUDIO_SAMPLE_FREQ, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT, frameBufferSize);
+    recorder = settingRecorder(AUDIO_SAMPLE_FREQ, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT, frameBufferSize);
@@ -170,7 +174,7 @@
   @Override
-  public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
+  public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
     super.onRequestPermissionsResult(requestCode, permissions, grantResults);
@@ -200,6 +204,12 @@
     if(listenerThread != null) listenerThread.quit();
+    listenerThread = null;
+    if(recorder != null) recorder.release();
+    recorder = null;
   }
@@ -324,11 +334,13 @@
 public class SurfaceDrawer implements SurfaceHolder.Callback {
+  @SuppressWarnings("UnusedDeclaration")
   private static final String TAG = "SurfaceDrawer";
-  private static final int COMPRESSION_RATE = 10;
+  private static final float COMPRESSION_RATE = 10f;
@@ -336,9 +348,9 @@
   private float canvasWidth, canvasVerticalCenter;
-  private Paint pathPaint;
+  private final Paint pathPaint;
-  private Path path = new Path();
+  private final Path path = new Path();
@@ -388,7 +400,7 @@
     canvasWidth = w;
-    canvasVerticalCenter = h / 2;
+    canvasVerticalCenter = h / 2f;
   }
@@ -420,7 +432,7 @@
-    path.reset();
+    path.rewind();
     path.moveTo(0, canvasVerticalCenter + data[0] / COMPRESSION_RATE);

app/build.gradle 追加

2021/10/01 11:39

投稿

jimbe

スコア12648

test CHANGED Viewed

@@ -441,3 +441,85 @@
 }
 ```
+app/build.gradle
+```plain
+plugins {
+    id 'com.android.application'
+}
+android {
+    compileSdk 30
+    defaultConfig {
+        applicationId "com.teratail.q362100"
+        minSdk 29
+        targetSdk 30
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+}
+dependencies {
+    implementation 'androidx.appcompat:appcompat:1.3.1'
+    implementation 'com.google.android.material:material:1.4.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.1'
+    testImplementation 'junit:junit:4.+'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
+}
+```

コード追加

2021/10/01 11:13

投稿

jimbe

スコア12648

test CHANGED Viewed

@@ -5,3 +5,439 @@
 のみに関しましては、 MySurfaceView に frn 配列へのセッターメソッドを作り、 MainPage で録音後に MySurfaceView インスタンスに対してそのセッターを呼ぶだけに思います。
 ですが、双方とも別スレッドで動作していますので、使用・更新のタイミングを意識しておかないと、表示が乱れる等の現象が発生するかもしれません。
+----
+オシロスコープのように動くモノが出来ましたので公開させていただきます。
+MainActivity.java
+```java
+package com.teratail.q362100;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.content.ContextCompat;
+import android.Manifest;
+import android.content.pm.PackageManager;
+import android.media.*;
+import android.os.*;
+import android.widget.Button;
+public class MainActivity extends AppCompatActivity {
+  private static final String TAG = "MainActivity";
+  private static final int PERMISSIONS_REQUEST_RECORD_AUDIO = 99;
+  private static final int AUDIO_SAMPLE_FREQ = 44100;//サンプリング周波数
+  private static final int FRAME_RATE = 10;
+  private static final String START_TEXT = "START";
+  private static final String STOP_TEXT = "STOP";
+  private short audioData[];
+  private Button button;
+  private HandlerThread listenerThread;
+  public void onCreate(Bundle bundle) {
+    super.onCreate(bundle);
+    setContentView(R.layout.activity_main);
+    setTitle("AudioRecord");
+    SurfaceDrawer surfaceDrawer = new SurfaceDrawer(findViewById(R.id.surfaceView));
+    int frameBufferSize = AUDIO_SAMPLE_FREQ / FRAME_RATE;
+    audioData = new short[frameBufferSize];
+    AudioRecord recorder = settingRecorder(AUDIO_SAMPLE_FREQ, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT, frameBufferSize);
+    listenerThread = new HandlerThread("RecordPositionUpdateListenerThread");
+    listenerThread.start();
+    recorder.setRecordPositionUpdateListener(new AudioRecord.OnRecordPositionUpdateListener() {
+      @Override
+      public void onMarkerReached(AudioRecord recorder) {}
+      @Override
+      public void onPeriodicNotification(AudioRecord recorder) {
+        recorder.read(audioData, 0, audioData.length);
+        surfaceDrawer.draw(audioData);
+      }
+    }, new Handler(listenerThread.getLooper())); //HandlerThread でリスナを実行
+    button = findViewById(R.id.button);
+    button.setText(START_TEXT);
+    button.setEnabled(false);
+    button.setOnClickListener(v -> {
+      switch(button.getText().toString()) { //トグル
+        case START_TEXT:
+          recorder.startRecording();
+          button.setText(STOP_TEXT);
+          break;
+        case STOP_TEXT:
+          recorder.stop();
+          button.setText(START_TEXT);
+          break;
+      }
+    });
+    int permissionCheck = ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO);
+    if(permissionCheck == PackageManager.PERMISSION_GRANTED) { // すでにユーザーがパーミッションを許可
+      button.setEnabled(true);
+    } else { // ユーザーはパーミッションを許可していない
+      requestPermissions(new String[]{Manifest.permission.RECORD_AUDIO}, PERMISSIONS_REQUEST_RECORD_AUDIO);
+    }
+  }
+  @Override
+  public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
+    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
+    if(requestCode == PERMISSIONS_REQUEST_RECORD_AUDIO) {
+      if(grantResults[0] != PackageManager.PERMISSION_GRANTED) { // ユーザが許可しなかったらアプリを終了する
+        finish();
+      }
+      button.setEnabled(true);
+    }
+  }
+  @Override
+  protected void onDestroy() {
+    super.onDestroy();
+    if(listenerThread != null) listenerThread.quit();
+  }
+  private AudioRecord settingRecorder(int sampleRateInHz, int channelConfig, int audioFormat, int frameBufferSize) {
+    int minBufferSize = AudioRecord.getMinBufferSize(sampleRateInHz, channelConfig, audioFormat);
+    if(minBufferSize == AudioRecord.ERROR_BAD_VALUE) throw new IllegalArgumentException();
+    if(minBufferSize == AudioRecord.ERROR) throw new IllegalStateException();
+    int bufferSizeInBytes = Math.max(minBufferSize, frameBufferSize*10); //"*10"は余裕分
+    AudioRecord recorder = new AudioRecord(MediaRecorder.AudioSource.MIC, sampleRateInHz, channelConfig, audioFormat, bufferSizeInBytes);
+    if(recorder.getState() != AudioRecord.STATE_INITIALIZED) throw new IllegalStateException();
+    if(recorder.setPositionNotificationPeriod(frameBufferSize) != AudioRecord.SUCCESS) throw new IllegalStateException();
+    return recorder;
+  }
+}
+```
+レイアウト: activity_main.xml
+```xml
+<?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">
+  <SurfaceView
+      android:id="@+id/surfaceView"
+      android:layout_width="0dp"
+      android:layout_height="0dp"
+      app:layout_constraintBottom_toTopOf="@id/button"
+      app:layout_constraintLeft_toLeftOf="parent"
+      app:layout_constraintRight_toRightOf="parent"
+      app:layout_constraintTop_toTopOf="parent" />
+  <Button
+      android:id="@+id/button"
+      android:layout_width="0dp"
+      android:layout_height="wrap_content"
+      android:text="START"
+      android:layout_margin="10dp"
+      app:layout_constraintBottom_toBottomOf="parent"
+      app:layout_constraintLeft_toLeftOf="parent"
+      app:layout_constraintRight_toRightOf="parent" />
+</androidx.constraintlayout.widget.ConstraintLayout>
+```
+SurfaceDrawer.java
+```java
+package com.teratail.q362100;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.Path;
+import android.view.SurfaceHolder;
+import android.view.SurfaceView;
+public class SurfaceDrawer implements SurfaceHolder.Callback {
+  private static final String TAG = "SurfaceDrawer";
+  private static final int COMPRESSION_RATE = 10;
+  private SurfaceHolder holder;
+  private float canvasWidth, canvasVerticalCenter;
+  private Paint pathPaint;
+  private Path path = new Path();
+  public SurfaceDrawer(SurfaceView surfaceView) {
+    holder = surfaceView.getHolder();
+    holder.addCallback(this);
+    pathPaint = new Paint();
+    pathPaint.setAntiAlias(true);
+    pathPaint.setStrokeWidth(2);//線幅
+    pathPaint.setStyle(Paint.Style.STROKE);
+    pathPaint.setColor(Color.GREEN);
+  }
+  @Override
+  public void surfaceCreated(SurfaceHolder holder) {
+    Canvas canvas = holder.lockCanvas();
+    if(canvas == null) return;
+    canvas.drawColor(Color.BLACK);
+    holder.unlockCanvasAndPost(canvas);
+  }
+  @Override
+  public void surfaceChanged(SurfaceHolder holder, int f, int w, int h) {
+    canvasWidth = w;
+    canvasVerticalCenter = h / 2;
+  }
+  @Override
+  public void surfaceDestroyed(SurfaceHolder holder) {
+    this.holder = null;
+  }
+  public void draw(short[] data) {
+    if(data == null || data.length < 2) return;
+    Canvas canvas = holder.lockCanvas();
+    if(canvas == null) return;
+    canvas.drawColor(Color.BLACK); //塗り潰し
+    path.reset();
+    path.moveTo(0, canvasVerticalCenter + data[0] / COMPRESSION_RATE);
+    for(int x=1; x<canvasWidth; x++) {
+      path.lineTo(x, canvasVerticalCenter + data[(int)(data.length / canvasWidth * x)] / COMPRESSION_RATE);
+    }
+    canvas.drawPath(path, pathPaint);
+    holder.unlockCanvasAndPost(canvas);
+  }
+}
+```