java - 在 Android Studio 中调用 MediaRecorder 会使应用程序崩溃

Question

我正在尝试创建一个类来设置和开始录音，但是当我点击按钮时应用程序崩溃了。我将问题隔离到我为 MediRecorder 设置参数的地方。

private void startRec() throws IOException {
    if (mrecorder!=null)
        mrecorder.release();

    mrecorder= new MediaRecorder();

->  mrecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    /*
    mrecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
    mrecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
    mrecorder.setOutputFile(MFILE);

    mrecorder.prepare();
    mrecorder.start();

    */
}

当执行注释开头上方带有箭头的行时，它会崩溃。我还向 list 添加了以下权限:

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

非常感谢任何帮助。

更新的 LOGCAT

[ 05-12 00:39:13.299 30086:30158 D/] ro.exynos.dss 已启用:005-12 00:39:13.309 30086-30158/record66.record6 D/mali_winsys:new_window_surface 返回 0x3000，[1440x2560]-格式:105-12 00:39:13.319 30086-30086/record66.record6 W/DisplayListCanvas:DisplayListCanvas 在未绑定(bind)的 RenderNode 上启动(没有 mOwningView)05-12 00:39:13.319 30086-30158/record66.record6 D/libGLESv1: DTS_GLAPI: DTS 不允许用于包:record66.record605-12 00:39:13.359 30086-30086/record66.record6 D/ViewRootImpl: MSG_RESIZED_REPORT: ci=Rect(0, 96 - 0, 0) vi=Rect(0, 96 - 0, 0) or=105-12 00:39:13.389 30086-30086/record66.record6 I/时间线:时间线:Activity_idle id:android.os.BinderProxy@682466c 时间:23440132205-12 00:39:15.749 30086-30086/record66.record6 D/ViewRootImpl: ViewPostImeInputStage processPointer 005-12 00:39:15.879 30086-30086/record66.record6 D/ViewRootImpl: ViewPostImeInputStage processPointer 105-12 00:39:15.929 30086-30086/record66.record6 D/AndroidRuntime:关闭 VM05-12 00:39:15.939 30086-30086/record66.record6 E/AndroidRuntime:致命异常:主要 进程:record66.record6，PID:30086 java.lang.RuntimeException: setAudioSource 失败。 在 android.media.MediaRecorder._setAudioSource( native 方法) 在 android.media.MediaRecorder.setAudioSource(MediaRecorder.java:488) 在 record66.record6.MainActivity.startRec(MainActivity.java:58) 在 record66.record6.MainActivity.onClick(MainActivity.java:94) 在 android.view.View.performClick(View.java:5697) 在 android.widget.TextView.performClick(TextView.java:10815) 在 android.view.View$PerformClick.run(View.java:22526) 在 android.os.Handler.handleCallback(Handler.java:739) 在 android.os.Handler.dispatchMessage(Handler.java:95) 在 android.os.Looper.loop(Looper.java:158) 在 android.app.ActivityThread.main(ActivityThread.java:7229) 在 java.lang.reflect.Method.invoke( native 方法) 在 com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 在 com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)05-12 00:39:17.909 30086-30086/record66.record6 I/进程:发送信号。 PID:30086 SIG:9

Answer 1

请看什么logcat是。

让我们知道您遇到了什么错误。所以可以提供帮助。

---

package com.example.dhrupalpatel.test;
import android.app.Activity;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import java.io.File;
import java.io.IOException;

public class MainActivity extends Activity implements View.OnClickListener{
MediaRecorder mrecorder;
boolean mStartRecording=false;

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

    start =(Button)findViewById(R.id.start);
    stop =(Button)findViewById(R.id.stop);
    start.setOnClickListener(this);
    stop.setOnClickListener(this);

}

private void startRec() throws IOException {
   boolean mExternalStorageAvailable = false;
    boolean mExternalStorageWriteable = false;
    String state = Environment.getExternalStorageState();

    if (Environment.MEDIA_MOUNTED.equals(state)) {
        // We can read and write the media
        mExternalStorageAvailable = mExternalStorageWriteable = true;
    } else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
        // We can only read the media
        mExternalStorageAvailable = true;
        mExternalStorageWriteable = false;
    } else {
        // Something else is wrong. It may be one of many other states, but all we need
        //  to know is we can neither read nor write
        mExternalStorageAvailable = mExternalStorageWriteable = false;
    }
    File sdCardDirectory= Environment
            .getExternalStorageDirectory();
    if(mExternalStorageAvailable && !sdCardDirectory.exists())
    {
        sdCardDirectory.mkdir();
    }
    File f= new File(sdCardDirectory.getPath()+"/"+System.currentTimeMillis()+".mp3");
    if( mrecorder == null ) {
        mrecorder = new MediaRecorder();
        mrecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        mrecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);

        mrecorder.setOutputFile(f.getPath());
        mrecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
    }
    if(!mStartRecording) {

        try {
            mrecorder.prepare();
            mrecorder.start();
            mStartRecording = true;
        }  catch (IOException e) {
            e.printStackTrace();
        }
    }
}

private void stopRec() throws IOException {

    if(mStartRecording) {
        mStartRecording = false;
        mrecorder.stop();
        mrecorder.reset();
        mrecorder.release();
        mrecorder = null;
    }
}

@Override
public void onClick(View v) {
    switch (v.getId())
    {
        case R.id.start:
            try {
                startRec();
            } catch (IOException e) {
                e.printStackTrace();
            }
            break;
        case R.id.stop:
            try {
                stopRec();
            } catch (IOException e) {
                e.printStackTrace();
            }
            break;
    }

}
}