Question

第一次为Android编写应用程序时，只有两个按钮都可以，所以我决定尝试包含MediaRecorder。当我按“开始”时，我收到消息“不幸的是，按钮教程已停止”。用“OK”。有人可能会建议出现什么问题以及为什么我需要做些什么来纠正它？这是我的“MainActivity.java”

package example.com;

import java.io.IOException;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity 
extends Activity
implements OnClickListener

{
    private static final String TAG = null;
    private String fileName;
    private MediaRecorder myRecorder = null;

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

        //Creating Button variable
        Button Btn_Start = (Button) this.findViewById(R.id.btStart);
        Button Btn_Stop = (Button) this.findViewById(R.id.btStop);        

        //Adding Listener to button
        Btn_Start.setOnClickListener(this);
        Btn_Stop.setOnClickListener(this);       
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
        case R.id.btStart:
            Log.i("onClick", "btStart BEGIN");
            try {
                startRecording();
            } catch (IllegalStateException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            Log.i("onClick", "btStart END");    
            break;
        case R.id.btStop:
            Log.i("onClick", "btStop BEGIN");
            stopRecording();
            Log.i("onClick", "btStop END"); 
            break;
    }    
}

        private void stopRecording() {
            myRecorder.stop();
    }

        private void startRecording() throws IllegalStateException, IOException {
            Log.d(TAG,"void startRecording");
            myRecorder = new MediaRecorder();
            Log.d(TAG,"new MediaRecorder");
            myRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
            Log.d(TAG,"setAudioSource");
            myRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
            Log.d(TAG,"setOutputFormat");
            //myRecorder.setOutputFile(mFileName);
            fileName = Environment.getExternalStorageDirectory() + "/audiotest.3gpp";
            myRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
            myRecorder.setOutputFile(fileName);
            myRecorder.prepare();
            myRecorder.start();
    }
}

这是“LogCat”

01-27 17:40:34.154: I/onClick(6116): btStart BEGIN
01-27 17:40:34.154: D/(6116): void startRecording
01-27 17:40:34.164: D/(6116): new MediaRecorder
01-27 17:40:34.164: D/AndroidRuntime(6116): Shutting down VM
01-27 17:40:34.164: W/dalvikvm(6116): threadid=1: thread exiting with uncaught exception (group=0x417ebba8)
01-27 17:40:34.164: E/AndroidRuntime(6116): FATAL EXCEPTION: main
01-27 17:40:34.164: E/AndroidRuntime(6116): Process: example.com, PID: 6116
01-27 17:40:34.164: E/AndroidRuntime(6116): java.lang.RuntimeException: setAudioSource failed.
01-27 17:40:34.164: E/AndroidRuntime(6116):     at android.media.MediaRecorder.setAudioSource(Native Method)
01-27 17:40:34.164: E/AndroidRuntime(6116):     at example.com.MainActivity.startRecording(MainActivity.java:68)
01-27 17:40:34.164: E/AndroidRuntime(6116):     at example.com.MainActivity.onClick(MainActivity.java:43)
01-27 17:40:34.164: E/AndroidRuntime(6116):     at android.view.View.performClick(View.java:4438)
01-27 17:40:34.164: E/AndroidRuntime(6116):     at android.view.View$PerformClick.run(View.java:18422)
01-27 17:40:34.164: E/AndroidRuntime(6116):     at android.os.Handler.handleCallback(Handler.java:733)
01-27 17:40:34.164: E/AndroidRuntime(6116):     at android.os.Handler.dispatchMessage(Handler.java:95)
01-27 17:40:34.164: E/AndroidRuntime(6116):     at android.os.Looper.loop(Looper.java:136)
01-27 17:40:34.164: E/AndroidRuntime(6116):     at android.app.ActivityThread.main(ActivityThread.java:5017)
01-27 17:40:34.164: E/AndroidRuntime(6116):     at java.lang.reflect.Method.invokeNative(Native Method)
01-27 17:40:34.164: E/AndroidRuntime(6116):     at java.lang.reflect.Method.invoke(Method.java:515)
01-27 17:40:34.164: E/AndroidRuntime(6116):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
01-27 17:40:34.164: E/AndroidRuntime(6116):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
01-27 17:40:34.164: E/AndroidRuntime(6116):     at dalvik.system.NativeStart.main(Native Method)

这是我的AndroidManifest.xml文件：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="example.com"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="example.com.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

有关我正在尝试在Google Nexus 7上运行此信息的信息

非常感谢

Answer 1

我的猜测是你缺少所需的权限，请尝试

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

您还需要：

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

Answer 2

将此添加到清单：

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

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

按下按钮时Android MediaRecorder崩溃

2 个答案: