Step 6: Learn android multimedia MediaRecorder recording

Step 6: Learn android multimedia MediaRecorder recording

MediaRecorder is the recording
To view the API first, you can see the lifecycle of the MediaRecorder.

The API not only provides a lifecycle diagram, but also provides examples as follows:

MediaRecorder recorder = new MediaRecorder(); recorder.setAudioSource(MediaRecorder.AudioSource.MIC); recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); recorder.setOutputFile(PATH_NAME); recorder.prepare(); recorder.start();   // Recording is now started ... recorder.stop(); recorder.reset();   // You can reuse the object by going back to setAudioSource() step recorder.release(); // Now the object cannot be reused

After viewing the API, we can try to write it;
[1] UI: two buttons, one playing and one stopping
[2] Click events
[3] Do not forget to add permissions

[4] Get MediaRecorder and set parameters

Recorder = new MediaRecorder (); // audio source recorder. setAudioSource (MediaRecorder. audioSource. MIC); // set the output format recorder. setOutputFormat (MediaRecorder. outputFormat. THREE_GPP); // Audio Encoding recorder. setAudioEncoder (MediaRecorder. audioEncoder. AMR_NB); // The setting is saved under sdcard named myrecord.3gp recorder. setOutputFile (Environment. getExternalStorageDirectory () +/myrecord.3gp );

[5] Start recording

 recorder.prepare();                    recorder.start();

[6] Stop recording

 recorder.stop();                recorder.reset();                recorder.release();

This has been fully implemented.

The complete source code is as follows:

public class MainActivity extends Activity implements View.OnClickListener{    private Button mButtonStart;    private Button mButtonStop;    private MediaRecorder recorder;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mButtonStart= (Button) findViewById(R.id.button_start);        mButtonStop= (Button) findViewById(R.id.button_stop);        mButtonStop.setOnClickListener(this);        mButtonStart.setOnClickListener(this);    }    @Override    public void onClick(View v) {        switch (v.getId()){            case R.id.button_start:                recorder=new MediaRecorder();                recorder.setAudioSource(MediaRecorder.AudioSource.MIC);                recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);                recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);                recorder.setOutputFile(Environment.getExternalStorageDirectory() + /myrecord.3gp);                try {                    recorder.prepare();                    recorder.start();                } catch (IOException e) {                    e.printStackTrace();                }                break;            case R.id.button_stop:                recorder.stop();                recorder.reset();                recorder.release();                break;            default:break;        }    }}