Question

我目前正在开发一个简单的语音记录器应用程序android应用程序，现在我想在其中添加其他功能。谁能帮我做一个录音机，录制2分钟的音频片段。

 public void intervalRecorder(long addOfThree){

        //This  code is not working properly

        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {

                mIntervalRecorder.setEnabled(false);
                mStopRecordBtn.setEnabled(false);
                mRecordBtn.setEnabled(false);


                k=1;
                testPath=UUID.randomUUID().toString() + "_audio_record.3gp";
                pathSave = Environment.getExternalStorageDirectory()
                        .getAbsolutePath() + "/Recorder Application/" +testPath;

                setupMediaRecorder12();
                try {
                    mediaRecorder12.prepare();
                    mediaRecorder12.start();
                } catch (IOException e) {
                    e.printStackTrace();
                }

                Toast.makeText(RecordActivity.this,"Recording...",Toast.LENGTH_SHORT).show();
            }
        },addOfThree);
        mediaRecorder12.stop();
        uploadAudio();
        Toast.makeText(RecordActivity.this,"Stop...",Toast.LENGTH_SHORT).show();
        k=0;

        mIntervalRecorder.setEnabled(true);
        mStopRecordBtn.setEnabled(true);
        mRecordBtn.setEnabled(true);
    }

`

private void setupMediaRecorder12() {
        mediaRecorder12 = new MediaRecorder();

        mediaRecorder12.setAudioSource(MediaRecorder.AudioSource.MIC);

        mediaRecorder12.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);

        mediaRecorder12.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB);

        mediaRecorder12.setOutputFile(pathSave);
    }

我不知道为什么我得到NullPointerException。

Logcat错误

  java.lang.NullPointerException: Attempt to invoke virtual method 'void android.media.MediaRecorder.stop()' on a null object reference
            at com.shashank.recorderapplication.RecordActivity.intervalRecorder(RecordActivity.java:299)
            at com.shashank.recorderapplication.RecordActivity$5.onClick(RecordActivity.java:242)
            at android.view.View.performClick(View.java:6935)
            at android.widget.TextView.performClick(TextView.java:12752)
            at android.view.View$PerformClick.run(View.java:26211)
            at android.os.Handler.handleCallback(Handler.java:790)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:164)
            at android.app.ActivityThread.main(ActivityThread.java:7000)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:441)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1408)

Answer 1

将mediaRecorder12 = new MediaRecorder();放在setContentView之后，而不是放在intervalRecorder函数内部。

Answer 2

//开始功能必须在处理程序之外，而停止将在处理程序内部

ax.view_init()

记录仪应用

2 个答案: