原理其实就是话筒的监听,需要在AndroidManifest.xml中要加入两个权限
<uses-permission android:name="android.permission.RECORD_AUDIO"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
另外模拟器无法测试,只能用真机才有效果
另外:低于API 14的SDK可能无效,我测试小米android2.3.5似乎无效,三星9300 android4.0有效!
以下是copy的代码,留在此处以便将来有不时之需。
package com.li; import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.TextView; public class BlowActivity extends Activity { static TextView text; Button btn; Button btn1; static int i=0; RecordThread tt=null; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); text=(TextView)findViewById(R.id.text); btn=(Button)findViewById(R.id.btn); btn.setOnClickListener(listener); } class MyHandler extends Handler{ } OnClickListener listener=new OnClickListener(){ @Override public void onClick(View v) { // TODO Auto-generated method stub tt=new RecordThread(r); //点击按钮,启动线程 tt.start(); } }; MyHandler r=new MyHandler(){ @Override public void handleMessage(Message msg) { // TODO Auto-generated method stub super.handleMessage(msg); //接收到message后更新UI,并通过isblow停止线程 text.setText("你吹了一下屏幕"+i); Parameter.isblow=false; } }; }
package com.li; import android.media.AudioFormat; import android.media.AudioRecord; import android.media.MediaRecorder; import android.os.Bundle; import android.os.Message; import com.li.BlowActivity.MyHandler; public class RecordThread extends Thread { private AudioRecord ar; private int bs = 100; private static int SAMPLE_RATE_IN_HZ = 8000; private Message msg; private int number = 1; private int tal = 1; private MyHandler handler; private long currenttime; private long endtime; private long time = 1; // 到达该值之后 触发事件 private static int BLOW_ACTIVI = 3000; public RecordThread(MyHandler myHandler) { super(); bs = AudioRecord.getMinBufferSize(SAMPLE_RATE_IN_HZ, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT); ar = new AudioRecord(MediaRecorder.AudioSource.MIC, SAMPLE_RATE_IN_HZ, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, bs); handler = myHandler; } @Override public void run() { try { ar.startRecording(); Parameter.isblow = true; // 用于读取的 buffer byte[] buffer = new byte[bs]; while (Parameter.isblow) { number++; sleep(8); currenttime = System.currentTimeMillis(); int r = ar.read(buffer, 0, bs) + 1; int v = 0; for (int i = 0; i < buffer.length; i++) { v += (buffer[i] * buffer[i]); } int value = Integer.valueOf(v / (int) r); tal = tal + value; endtime = System.currentTimeMillis(); time = time + (endtime - currenttime); if (time >= 500 || number > 5) { int total = tal / number; if (total > BLOW_ACTIVI) { // 发送消息通知到界面 触发动画 // 利用传入的handler 给界面发送通知 BlowActivity.i += 1; handler.sendEmptyMessage(0); // 改变i的值后,发送一个空message到主线程 // number = 1; tal = 1; time = 1; } } } ar.stop(); ar.release(); bs = 100; } catch (Exception e) { e.printStackTrace(); } } }
public class Parameter { static boolean isblow; }