wifi的五种状态
| 常量名 | 常量值 | 网卡状态 |
| WIFI_STATE_DISABLED | 1 | WIFI网卡不可用 |
| WIFI_STATE_DISABLING | 0 | WIFI正在关闭 |
| WIFI_STATE_ENABLED | 3 | WIFI网卡可用 |
| WIFI_STATE_ENABLING | 2 | WIFI网卡正在打开 |
| WIFI_STATE_UNKNOWN | 4 | 未知网卡状态 |
public class MainActivity extends Activity { WifiManager mWifiManager = null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } public void onClick(View v) { switch (v.getId()) { case R.id.open_wifi: mWifiManager = (WifiManager)MainActivity.this.getSystemService(Context.WIFI_SERVICE); mWifiManager.setWifiEnabled(true); if(mWifiManager.getWifiState() == 2) { Toast.makeText(MainActivity.this, "当前网卡状态为：WIFI正在打开...", Toast.LENGTH_SHORT).show(); } else if(mWifiManager.getWifiState() == 3) { Toast.makeText(MainActivity.this, "当前网卡状态为：WIFI正常使用", Toast.LENGTH_SHORT).show(); } break; case R.id.close_wifi: mWifiManager = (WifiManager)MainActivity.this.getSystemService(Context.WIFI_SERVICE); mWifiManager.setWifiEnabled(false); if(mWifiManager.getWifiState() == 0) { Toast.makeText(MainActivity.this, "当前网卡状态为：WIFI正在关闭...", Toast.LENGTH_SHORT).show(); } else if(mWifiManager.getWifiState() == 1) { Toast.makeText(MainActivity.this, "当前网卡状态为：WIFI已关闭", Toast.LENGTH_SHORT).show(); } break; case R.id.wifi_state: mWifiManager = (WifiManager)MainActivity.this.getSystemService(Context.WIFI_SERVICE); if(mWifiManager.getWifiState() == 0) { Toast.makeText(MainActivity.this, "当前网卡状态为：WIFI正在关闭...", Toast.LENGTH_SHORT).show(); } else if(mWifiManager.getWifiState() == 1) { Toast.makeText(MainActivity.this, "当前网卡状态为：WIFI已关闭", Toast.LENGTH_SHORT).show(); } else if(mWifiManager.getWifiState() == 2) { Toast.makeText(MainActivity.this, "当前网卡状态为：WIFI正在打开...", Toast.LENGTH_SHORT).show(); } else if(mWifiManager.getWifiState() == 3) { Toast.makeText(MainActivity.this, "当前网卡状态为：WIFI正常使用", Toast.LENGTH_SHORT).show(); } else if(mWifiManager.getWifiState() == 4) { Toast.makeText(MainActivity.this, "当前网卡状态为：WIFI状态未知", Toast.LENGTH_SHORT).show(); } break; default: break; } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.activity_main, menu); return true; }} xml
添加权限:
CHANGE_NETWORK_STATE ：允许修改网络状态的权限。 CHANGE_WIFI_STATE ：允许修改 WIFI 状态的权限。 ACCESS_NETWORK_STATE ：允许访问网络状态的权限。 ACCESS_WIFI_STATE ：允许访问 WIFI 状态的权限。
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