Detailed explanation of Android development recording and playing audio steps (dynamic access)
- 2021-11-10 10:50:57
- OfStack
Steps:
Configure permissions:
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.work.mediaplay">
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
<uses-permission android:name="android.permission.RECORD_AUDIO"></uses-permission>
Code steps:
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
private Button btn_start, btn_stop;
private ListView lv_content;
private File sdcardfile = null;
private String[] files;
private MediaRecorder recorder=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
getSDCardFile();
getFileList();
}
/**
* ① Instantiate a control
*/
private void initView() {
btn_start = (Button) findViewById(R.id.btn_stat);
btn_stop = (Button) findViewById(R.id.btn_stop);
lv_content = (ListView) findViewById(R.id.lv_content);
// Add listening events to buttons
btn_start.setOnClickListener(this);
btn_stop.setOnClickListener(this);
// Set the start state. The start button is available and the stop button is unavailable
btn_start.setEnabled(true);
btn_stop.setEnabled(false);
}
/**
* Methods of obtaining files in memory card
*/
private void getSDCardFile() {
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {// Memory card exists
sdcardfile=Environment.getExternalStorageDirectory();// Get a directory file
}else {
Toast.makeText(this," Memory card not found ",Toast.LENGTH_SHORT).show();
}
}
/**
* ③ Get the file list ( listView Data source in)
* Returns a collection of file names of the specified file type as a data source
*/
private void getFileList(){
if(sdcardfile!=null){
files=sdcardfile.list(new MyFilter());
lv_content.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,files));
// ⑥ Give ListView Add click-to-play events to elements in
lv_content.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// Attending Define the method of playing audio
play(files[position]);
}
});
}
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.btn_stat:
// 8 Apply for dynamic permission to record audio
if(ContextCompat.checkSelfPermission(this, android.Manifest.permission.RECORD_AUDIO)
!= PackageManager.PERMISSION_GRANTED){
ActivityCompat.requestPermissions(this,new String[]{
android.Manifest.permission.RECORD_AUDIO},1);
}else {
startRecord();
}
break;
case R.id.btn_stop:
stopRcecord();
break;
}
}
/**
* 4 Definition 1 File filters MyFilter Inner class of , Realization FilenameFilter Interface
* Rewrite inside accept Method
*/
class MyFilter implements FilenameFilter{
@Override
public boolean accept(File pathname,String fileName) {
return fileName.endsWith(".amr");
}
}
/**
* ⑦ Define the start and pause methods for the two buttons
*
*/
private void startRecord(){
if(recorder==null){
recorder=new MediaRecorder();
}
recorder.setAudioSource(MediaRecorder.AudioSource.MIC);// Set the audio source to the microphone of the mobile phone
recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);// Format Output 3gp
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);// Set the audio encoding to amr Format
// Get the root directory of the memory card and create a temporary file
try {
File file=File.createTempFile(" Recording _",".amr",sdcardfile);
recorder.setOutputFile(file.getAbsolutePath());// Set the file output path
// Prepare and start recording audio
recorder.prepare();
recorder.start();
} catch (IOException e) {
e.printStackTrace();
}
// Swap the available state of the two buttons after startup
btn_start.setEnabled(false);
btn_stop.setEnabled(true);
}
private void stopRcecord(){
if(recorder!=null){
recorder.stop();
recorder.release();
recorder=null;
}
btn_start.setEnabled(true);
btn_stop.setEnabled(false);
// Refresh list data
getFileList();
}
/**
* Pet-name ruby rewrite onRequestPermissionsResult Method
* Get the result of a dynamic permission request , Turn on recording audio again
*/
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
if(requestCode==1&&grantResults[0]==PackageManager.PERMISSION_GRANTED){
startRecord();
}else {
Toast.makeText(this," User denied permission ",Toast.LENGTH_SHORT).show();
}
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
/**
* Attending Define the method of playing audio
*/
private void play(String fileName){
Intent intent=new Intent(Intent.ACTION_VIEW);
// To play audio uri, Get from a file , Path required in file
Uri uri=Uri.fromFile(new File(sdcardfile.getAbsoluteFile()+File.separator+fileName));
// Set playback data and type
intent.setDataAndType(uri,"audio/*");
startActivity(intent);
}