在android中根据信号强度加载不同的wifi信号强度图像

Question

我正在尝试在我的android应用程序上显示图像（表示wifi信号强度的基本图像）。我试着用下面的代码来实现它

public View getView(int position, View convertView, ViewGroup parent) {
		LayoutInflater inflater = (LayoutInflater) MainActivity.this
				.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
		View view = inflater.inflate(R.layout.wifi_row, parent, false);
		S_ID = (TextView) view.findViewById(R.id.SSID);
		BSSID = (TextView) view.findViewById(R.id.BSSID);
		wifi_strength = (ImageView) view.findViewById(R.id.wifi_signal);
		wifi_lock = (ImageView) view.findViewById(R.id.wifi_lock);
		S_ID.setText(my_array.get(position));
		BSSID.setText(wifiScanList.get(position).BSSID);
		
		
		int current_level = 5;
		int signal_level = WifiManager.calculateSignalLevel(mainWifiObj
				.getConnectionInfo().getRssi(), current_level);
		int signal_difference = (signal_level * 100) / current_level;
		
		Log.d("Signal_level", String.valueOf(signal_level));
		if (signal_difference >= 100) {
			wifi_strength.setImageResource(R.drawable.wifi_signal_4);
		} else if (signal_difference >= 75) {
			wifi_strength.setImageResource(R.drawable.wifi_signal_3);
		} else if (signal_difference >= 50) {
			wifi_strength.setImageResource(R.drawable.wifi_signal_2);
		} else if (signal_difference >= 25) {
			wifi_strength.setImageResource(R.drawable.wifi_signal_1);
		}

下面是我的接收器类

protected void onPause() {
	unregisterReceiver(wifiReciever);
	super.onPause();
}
protected void onResume() {
	registerReceiver(wifiReciever, new IntentFilter(
			WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
	super.onResume();
}
class WifiScanReceiver extends BroadcastReceiver {
	@SuppressLint("UseValueOf")
	public void onReceive(Context c, Intent intent) {
		wifiScanList = mainWifiObj.getScanResults();
		for (int i = 0; i < wifiScanList.size(); i++) {
			my_array.add((wifiScanList.get(i)).SSID);
		}
		myAdapter.notifyDataSetChanged();
	}
} 

但即使是最弱的wifi网络，它也总是显示全信号的wifi图像。

你知道怎么做吗？

Answer 1

我自己解决了这个问题。使用hashMap存储SSID和相应的信号强度。在getView方法中，我使用SSID（Key）检索信号级别（值）。

以下代码对我有效

 int wifiSignalLevel = wifi_level.get(my_array.get(position));
        Log.d(my_array.get(position) + " Strength ",
                String.valueOf(wifiSignalLevel));
        if (wifiSignalLevel >= -70) {
            wifi_strength.setImageResource(R.drawable.wifi_signal_4);
        } else if (wifiSignalLevel >= -80) {
            wifi_strength.setImageResource(R.drawable.wifi_signal_3);
        } else if (wifiSignalLevel >= -90) {
            wifi_strength.setImageResource(R.drawable.wifi_signal_2);
        } else if (wifiSignalLevel >= -100) {
            wifi_strength.setImageResource(R.drawable.wifi_signal_1);
        }