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我写了一个运行的代码：

public class WifiActivity extends Activity {

    private ListView listeViewWifi;
    private List<WifiItem> listeWifiItem;
    private WifiAdapter wifiAdapter;
    private WifiManager wifiManager;
    private WifiBroadcastReceiver broadcastReceiver;
    private Timer timer;
    private Timer2 timer2;
    private boolean success;
    private boolean broadcastFinish;
    private Button buttonMeasure;
    private Button buttonLocate;
    private EditText coordX;
    private EditText coordY;
    private float[][][] radioMap = new float[100][100][5];




    @Override
    public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_wifi);
       listeViewWifi = (ListView) findViewById(R.id.listViewWifi);
           wifiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);

               if(wifiManager != null){
                   wifiManager.startScan();}

                       // On récupère le service WiFi d'Android
                       wifiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);

                       // Gestion de la liste des AP WiFi (voir tuto sur les adapters et les
                       // listviews)
                       listeWifiItem = new ArrayList<WifiItem>();
                       wifiAdapter = new WifiAdapter(this, listeWifiItem);
                       listeViewWifi.setAdapter(wifiAdapter);

                       // Création du broadcast Receiver
                       broadcastReceiver = new WifiBroadcastReceiver();

                       // On attache le receiver au scan result
                       registerReceiver(broadcastReceiver, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
                       timer = new Timer(this);
                       timer.applyTimer();

                       [...]


            public void tempsFini(){

                broadcastFinish = WifiBroadcastReceiver.getBroadcastFinish();
                Log.d("info3","broadcastFinish (activity) : " + broadcastFinish);
                 if(broadcastFinish == true){
                     success = false;
                    while(success==false){
                    success=wifiManager.startScan();
                        Log.d("info2","startScan : " + success);
                    }   
                }
            }

然后这是计时器方法：

public class Timer {

    private WifiActivity activity;
    private Handler h = new Handler();
    private Runnable run = new Runnable() {
        @Override
        public void run() {
            Log.d("info3","timer");
                activity.tempsFini();   //on met à jour le truc wifi
                h.postDelayed(this, 200); //Donc revient toutes les 200ms
            }
        }
    ;

    public Timer(WifiActivity wifiActivity){
        activity = (WifiActivity) wifiActivity;
    }

    public void applyTimer() {
        h.postDelayed(run, 0); //run est en fait vraiment instancié ici
    }

    public void cancelTimer(){
        h.removeCallbacks(run);
    }
}

该程序运行。我做了一些更改，因为我想在单击按钮时进行 AP 扫描。

buttonMeasure = (Button) findViewById(R.id.buttonMeasure);

buttonMeasure.setOnClickListener(new OnClickListener() {

    public void onClick(View v) {
        //Envoyer une moyenne de mesure pour chaque RSSI

       Log.d("info7","onClick");

       coordX = (EditText) findViewById(R.id.coordX);
       coordY = (EditText) findViewById(R.id.coordY);

       String xString = coordX.getText().toString();
       final int xInt = Integer.parseInt(xString);

       String yString = coordY.getText().toString();
       final int yInt = Integer.parseInt(yString);

       timer2 = new Timer2(this); //****

       while(WifiBroadcastReceiver.getMeasureFinished()<=49){
           Log.d("info7","mesure" + WifiBroadcastReceiver.getMeasureFinished());


           timer2.applyTimer(); 
       }

       for(int i=0;i<=4;i++){
           radioMap[xInt][yInt][i]=WifiBroadcastReceiver.getRSSI(i);
       }
    }
});

方法 timer2 与 timer 相同，我刚刚更改了：

public Timer2(OnClickListener onClickListener){
    activity = (WifiActivity) onClickListener; //****
}

但是现在代码不起作用...... Logcat 在我评论* * 的行上显示错误。

你知道我该如何解决这个问题吗？

谢谢

4

1 回答 1

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OnClickListener 不能强制转换为 Activity。代替

timer2 = new Timer2(this);

采用：

timer2 = new Timer2(WifiActivity.this);

并使您的功能像以前一样：

public Timer2(WifiActivity wifiActivity){
    activity = (WifiActivity) wifiActivity;
}
于 2013-08-05T10:50:21.040 回答