Android force close应该已经设置了字幕控制器

我在android studio中创建录制应用程序。 我尝试记录并播放结果，没问题。 但是当我第二次尝试录制时，应用程序强制关闭并且LogCat只给我“E / MediaPlayer：应该已经设置了字幕控制器”

这是代码：

MainActivity.java

package com.zihadrizkyef.belajaraudiocapture; import android.media.MediaPlayer; import android.media.MediaRecorder; import android.os.Environment; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.Toast; import java.io.IOException; public class MainActivity extends AppCompatActivity { Button btnPlay, btnStop, btnStart; MediaRecorder myAudioRecorder; String outputFile = null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); btnPlay = (Button) findViewById(R.id.btnRecordPlay); btnStart = (Button) findViewById(R.id.btnRecordStart); btnStop = (Button) findViewById(R.id.btnRecordStop); btnPlay.setEnabled(false); btnStop.setEnabled(false); outputFile = Environment.getExternalStorageDirectory().getAbsolutePath()+"/recording.3gpp"; myAudioRecorder = new MediaRecorder(); myAudioRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); myAudioRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); myAudioRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB); myAudioRecorder.setOutputFile(outputFile); btnStart.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { try { myAudioRecorder.prepare(); myAudioRecorder.start(); } catch (IOException | IllegalStateException e) { e.printStackTrace(); } btnStart.setEnabled(false); btnStop.setEnabled(true); Toast.makeText(MainActivity.this, "Recording started", Toast.LENGTH_SHORT).show(); } }); btnStop.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { myAudioRecorder.stop(); myAudioRecorder.release(); /*myAudioRecorder = null;*/ btnPlay.setEnabled(true); btnStart.setEnabled(true); btnStop.setEnabled(false); Toast.makeText(MainActivity.this, "Audio recorded successfully", Toast.LENGTH_SHORT).show(); } }); btnPlay.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { MediaPlayer mediaPlayer = new MediaPlayer(); try { mediaPlayer.setDataSource(outputFile); } catch (IOException e) { e.printStackTrace(); } try { mediaPlayer.prepare(); } catch (IOException e) { e.printStackTrace(); } mediaPlayer.start(); Toast.makeText(MainActivity.this, "Playing audio", Toast.LENGTH_SHORT).show(); } }); } } 

Answer 1

Plse尝试下面的代码：

  package com.zihadrizkyef.belajaraudiocapture; import android.media.MediaPlayer; import android.media.MediaRecorder; import android.os.Environment; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.Toast; import java.io.IOException; public class MainActivity extends AppCompatActivity { Button btnPlay, btnStop, btnStart; MediaRecorder myAudioRecorder; String outputFile = null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); btnPlay = (Button) findViewById(R.id.btnRecordPlay); btnStart = (Button) findViewById(R.id.btnRecordStart); btnStop = (Button) findViewById(R.id.btnRecordStop); btnPlay.setEnabled(false); btnStop.setEnabled(false); btnStart.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { try { outputFile = Environment.getExternalStorageDirectory().getAbsolutePath()+"/recording.3gpp"; //Creating MediaRecorder and specifying audio source, output format, encoder & output format myAudioRecorder = new MediaRecorder(); myAudioRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); myAudioRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); myAudioRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB); myAudioRecorder.setOutputFile(outputFile); myAudioRecorder.prepare(); myAudioRecorder.start(); } catch (IOException | IllegalStateException e) { e.printStackTrace(); } btnStart.setEnabled(false); btnStop.setEnabled(true); Toast.makeText(MainActivity.this, "Recording started", Toast.LENGTH_SHORT).show(); } }); btnStop.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { myAudioRecorder.stop(); myAudioRecorder.release(); /*myAudioRecorder = null;*/ btnPlay.setEnabled(true); btnStart.setEnabled(true); btnStop.setEnabled(false); Toast.makeText(MainActivity.this, "Audio recorded successfully", Toast.LENGTH_SHORT).show(); } }); btnPlay.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { MediaPlayer mediaPlayer = new MediaPlayer(); try { mediaPlayer.setDataSource(outputFile); } catch (IOException e) { e.printStackTrace(); } try { mediaPlayer.prepare(); } catch (IOException e) { e.printStackTrace(); } mediaPlayer.start(); Toast.makeText(MainActivity.this, "Playing audio", Toast.LENGTH_SHORT).show(); } }); } } 

在这里，我所做的是我创建了MediaRecorder并指定了音频源，输出格式……每个开始按钮点击的所有内容