android控制wifi状态

老爷子88

　　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



<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >
<Button
android:id="@+id/open_wifi"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="打开WIFI"
android:onClick="onClick" />
<Button
android:id="@+id/close_wifi"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="关闭WIFI"
android:onClick="onClick"/>
<Button
android:id="@+id/wifi_state"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="WIFI状态"
android:onClick="onClick"/>
</LinearLayout>
　　添加权限:



<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
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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