android控制wifi状态

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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