我有一个可以监控房间噪音水平的应用程序，我最初从Github获得了代码，在原始代码中，程序员正在监控主要活动的噪音水平并在textview中显示结果，但我想要监控使用服务，我已经实现了一切和它的工作，但文本视图似乎滞后，让我说我做了一点噪音，噪音水平达到5，即使在房间没有噪音，它仍然坚持5，但在最初的应用程序中，它是如此敏感，它会回到0或另一个值取决于噪音水平，我不知道我哪里出错，但下面是我的代码：
主要活动
public class StartingPoint extends Activity {
private String volumeBars;
private String volumeLevel;
private TextView volumeBarView;
private TextView volumeLevelView;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Toast.makeText(getBaseContext(), "Loading...", Toast.LENGTH_LONG).show();
setContentView(R.layout.activity_starting_point);
//starting Service
startService(new Intent(this, VolumeListerner.class));
volumeBarView = (TextView) findViewById(R.id.volumeBars);
volumeLevelView = (TextView) findViewById(R.id.volumeLevel);
}
@Override
public void onResume() {
LocalBroadcastManager.getInstance(this).registerReceiver(mReceiver, new IntentFilter("UI_UPDATER"));
super.onResume();
// Sound based code
}
@Override
public void onPause() {
super.onPause();
}
public void updateTextView() {
volumeBarView.setText(volumeBars);
volumeLevelView.setText(volumeLevel);
return;
}
private BroadcastReceiver mReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
volumeBars = intent.getStringExtra("VolumeBars");
volumeLevel = intent.getStringExtra("volumeLevel");
Log.d("receiver", "Got message: " + volumeBars + " : " + volumeLevel);
updateTextView();
}
};
服务：
public class VolumeListerner extends Service {
private static String volumeVisual = "";
private static int volumeToSend;
private Handler handler;
private SoundMeter mSensor;
/** interface for clients that bind */
IBinder mBinder;
/** indicates whether onRebind should be used */
boolean mAllowRebind;
/** The service is starting, due to a call to startService() */
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
soundLevelCheck();
return super.onStartCommand(intent, flags, startId);
}
private void soundLevelCheck()
{
mSensor = new SoundMeter();
try {
mSensor.start();
Toast.makeText(getBaseContext(), "Sound sensor initiated.", Toast.LENGTH_SHORT).show();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
handler = new Handler();
final Runnable r = new Runnable() {
public void run() {
// Get the volume from 0 to 255 in 'int'
double volume = 10 * mSensor.getTheAmplitude() / 32768;
volumeToSend = (int) volume;
volumeVisual = "";
for( int i=0; i<volumeToSend; i++){
volumeVisual += "|";
updateUI();
}
handler.postDelayed(this, 250); // amount of delay between every cycle of volume level detection + sending the data out
}
};
// Is this line necessary? --- YES IT IS, or else the loop never runs
// this tells Java to run "r"
handler.postDelayed(r, 250);
}
private void updateUI()
{
Intent intent = new Intent( "UI_UPDATER" );
intent.putExtra("VolumeBars", "Volume Bars: " + String.valueOf(volumeVisual));
intent.putExtra("volumeLevel","Volume Levels: " + String.valueOf(volumeToSend));
LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
}