当我尝试录制音频时，我的应用程序会抛出IOException。 java.io.FileNotFoundException：/storage/emulated/0/recording.3gp： open failed： EACCES (Permission dedened(。它发生在我的 recordButton.SetOnClickListener 方法中，更具体地说，发生在我代码的 try-catch 部分。我真的不知道为什么它失败了，但我有一种感觉它与我的输出文件字符串有关。 这是我的 JAVA 文件：
package com.example.audiorecorder;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import android.Manifest;
import android.content.pm.PackageManager;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import java.io.IOException;
public class MainActivity extends AppCompatActivity {
Button playBtn, recordBtn, stopBtn;
String outputFile;
MediaRecorder mediaRecorder;
private static final int REQUEST_RECORD_AUDIO_PERMISSION = 200;
private boolean permissionToRecordAccepted = false;
private String [] permissions = {Manifest.permission.RECORD_AUDIO};
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode){
case REQUEST_RECORD_AUDIO_PERMISSION:
permissionToRecordAccepted = grantResults[0] == PackageManager.PERMISSION_GRANTED;
break;
}
if (!permissionToRecordAccepted ) finish();
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ActivityCompat.requestPermissions(this, permissions, REQUEST_RECORD_AUDIO_PERMISSION);
outputFile = Environment.getExternalStorageDirectory().getAbsolutePath() + "/recording.3gp";
playBtn = findViewById(R.id.play_btn);
recordBtn = findViewById(R.id.record_btn);
stopBtn = findViewById(R.id.stop_btn);
mediaRecorder = new MediaRecorder();
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
mediaRecorder.setOutputFile(outputFile);
recordBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
try{
mediaRecorder.prepare();
mediaRecorder.start();
Toast.makeText(getApplicationContext(), "Recording started", Toast.LENGTH_LONG).show();
System.out.println("IT TRIED RECORDING");
} catch (IllegalStateException ise){
System.out.println("FAIL RECORDING 1");
} catch (IOException ioe){
System.out.println("FAIL RECORDING 2");
}
System.out.println("ITS JUST PRESSING RECORD BUT NOTHING");
}
});
stopBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
try{
mediaRecorder.stop();
mediaRecorder.release();
mediaRecorder = null;
System.out.println("IT TRIED STOPPING");
} catch (Exception e){
System.out.println("FAIL STOP 1");
}
Toast.makeText(getApplicationContext(), "Stop Recording", Toast.LENGTH_LONG).show();
}
});
playBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
MediaPlayer mediaPlayer = new MediaPlayer();
try {
mediaPlayer.setDataSource(outputFile);
mediaPlayer.prepare();
mediaPlayer.start();
Toast.makeText(getApplicationContext(), "Playing Audio", Toast.LENGTH_LONG).show();
} catch (Exception e) {
// make something
}
}
});
}
}
这是我的XML文件：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="vertical"
tools:context=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="40dp"
android:textStyle="bold"
android:text="RECORDER TEST LAB"
android:textColor="#000000"
android:textSize="24dp"
/>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5dp"
android:background="#000000"
android:layout_marginTop="10dp"
>
<Button
android:id="@+id/record_btn"
android:layout_height="80dp"
android:layout_width="match_parent"
android:textSize="22dp"
android:background="#E70D0D"
android:text="record"
android:textStyle="bold"
>
</Button>
</RelativeLayout>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5dp"
android:background="#000000"
android:layout_marginTop="10dp"
>
<Button
android:id="@+id/stop_btn"
android:layout_height="80dp"
android:layout_width="match_parent"
android:textSize="22dp"
android:background="#E70D0D"
android:text="stop"
android:textStyle="bold"
>
</Button>
</RelativeLayout>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5dp"
android:background="#000000"
android:layout_marginTop="10dp"
>
<Button
android:id="@+id/play_btn"
android:layout_height="80dp"
android:layout_width="match_parent"
android:text="Play"
android:textSize="22dp"
android:background="#35E70D"
android:textStyle="bold"
/>
</RelativeLayout>
这是我的安卓清单：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.audiorecorder">
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.STORAGE"/>
<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/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
提前感谢您的帮助。我会投票给一个对我有帮助的答案！
您忘记也请求WRITE_EXTERNAL_STORAGE权限。
String[] permissions = { Manifest.permission.RECORD_AUDIO, Manifest.permission.WRITE_EXTERNAL_STORAGE };
ActivityCompat.requestPermissions(this, permissions, PERMISSIONS_REQUEST_CODE);