android mediarecorder例子 androidmediarecorder|Android

MediaRecorder类可用于记录音频和视频文件。
录制媒体后，我们可以创建一个声音文件，以便以后播放。
在此示例中，我们将记录音频文件并将其以3gp格式存储在外部目录中。
activity_main.xml【android mediarecorder例子】从面板上拖动2个按钮，一个开始录制，另一个停止录制。在这里，我们使用android：onClick在xml文件中向侦听器注册视图。

< RelativeLayout xmlns:androclass="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" >< Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:layout_marginLeft="68dp" android:layout_marginTop="50dp" android:text="Start Recording" android:onClick="startRecording" />< Button android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/button1" android:layout_below="@+id/button1" android:layout_marginTop="64dp" android:text="Stop Recording" android:onClick="stopRecording" />< /RelativeLayout>

活动类

package com.srcmini.mediarecorder; import java.io.File; import java.io.IOException; import android.app.Activity; import android.content.ContentResolver; import android.content.ContentValues; import android.content.Intent; import android.media.MediaRecorder; import android.net.Uri; import android.os.Bundle; import android.os.Environment; import android.provider.MediaStore; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.Toast; public class MainActivity extends Activity { MediaRecorder recorder; File audiofile = null; static final String TAG = "MediaRecording"; Button startButton, stopButton; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); startButton = (Button) findViewById(R.id.button1); stopButton = (Button) findViewById(R.id.button2); }public void startRecording(View view) throws IOException { startButton.setEnabled(false); stopButton.setEnabled(true); //Creating file File dir = Environment.getExternalStorageDirectory(); try { audiofile = File.createTempFile("sound", ".3gp", dir); } catch (IOException e) { Log.e(TAG, "external storage access error"); return; } //Creating MediaRecorder and specifying audio source, output format, encoder & output format recorder = new MediaRecorder(); recorder.setAudioSource(MediaRecorder.AudioSource.MIC); recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); recorder.setOutputFile(audiofile.getAbsolutePath()); recorder.prepare(); recorder.start(); }public void stopRecording(View view) { startButton.setEnabled(true); stopButton.setEnabled(false); //stopping recorder recorder.stop(); recorder.release(); //after stopping the recorder, create the sound file and add it to media library. addRecordingToMediaLibrary(); }protected void addRecordingToMediaLibrary() { //creating content values of size 4 ContentValues values = new ContentValues(4); long current = System.currentTimeMillis(); values.put(MediaStore.Audio.Media.TITLE, "audio" + audiofile.getName()); values.put(MediaStore.Audio.Media.DATE_ADDED, (int) (current / 1000)); values.put(MediaStore.Audio.Media.MIME_TYPE, "audio/3gpp"); values.put(MediaStore.Audio.Media.DATA, audiofile.getAbsolutePath()); //creating content resolver and storing it in the external content uri ContentResolver contentResolver = getContentResolver(); Uri base = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; Uri newUri = contentResolver.insert(base, values); //sending broadcast message to scan the media file so that it can be available sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, newUri)); Toast.makeText(this, "Added File " + newUri, Toast.LENGTH_LONG).show(); } }

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