18

我需要在 Android 2.2 (Froyo) 中调用什么 API 来创建 Wifi 热点（如 Tethering and Portable Hotspot 设置项中所示）。

4

3 回答 3

26

没有官方的 API，但是你可以使用反射来处理它。我知道有人说，不建议这样做，但是恕我直言，如果 Google 出于任何原因不想提供 API，那就搞砸了。

下面是我在应用程序中使用的活动代码，用户可以在其中启用/禁用 Wifi AP。当您启用 Wifi AP 时，通常会关闭常规 Wifi，因此在用户再次禁用 Wifi AP 后，我们将再次激活常规 wifi。

下面的代码示例取自我的一个项目，希望您能轻松获得其中的逻辑。如果您还有其他问题，请告诉我。

代码在 Nexus One 2.2（我认为也是 2.3）以及三星 Galaxy S（2.2）上进行了测试。

package com.myapp.android.activity.wifi;

import android.app.ProgressDialog;
import android.content.Context;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;

import java.lang.reflect.Method;

public class WifiAP extends BaseActivity {

    // boolean mIsWifiEnabled = false;
    private static final int WIFI_AP_STATE_UNKNOWN = -1;
    private static final int WIFI_AP_STATE_DISABLING = 0;
    private static final int WIFI_AP_STATE_DISABLED = 1;
    private static final int WIFI_AP_STATE_ENABLING = 2;
    private static final int WIFI_AP_STATE_ENABLED = 3;
    private static final int WIFI_AP_STATE_FAILED = 4;

    private final String[] WIFI_STATE_TEXTSTATE = new String[] {
        "DISABLING","DISABLED","ENABLING","ENABLED","FAILED"
    };

    private WifiManager wifi;

    @Override
    protected void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.wifi);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD
                |WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
                |WindowManager.LayoutParams.FLAG_DIM_BEHIND
        );

        wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
    }

    @Override
    public void onResume() {
        super.onResume();
        updateStatusDisplay();
    }

    public void toggleWifi(View v) {
        boolean wifiApIsOn = getWifiAPState()==WIFI_AP_STATE_ENABLED || getWifiAPState()==WIFI_AP_STATE_ENABLING;
        new SetWifiAPTask(!wifiApIsOn,false).execute();
    }

    public void close(View v) {
        boolean wifiApIsOn = getWifiAPState()==WIFI_AP_STATE_ENABLED || getWifiAPState()==WIFI_AP_STATE_ENABLING;
        if (wifiApIsOn) {
            new SetWifiAPTask(false,true).execute();
        } else {
            finish();
        }
    }


    /**
     * Endable/disable wifi
     * @param enabled
     * @return WifiAP state
     */
    private int setWifiApEnabled(boolean enabled) {
        Log.d("WifiAP", "*** setWifiApEnabled CALLED **** " + enabled);
        if (enabled && wifi.getConnectionInfo() !=null) {
            wifi.setWifiEnabled(false);
            try {Thread.sleep(1500);} catch (Exception e) {}
        }

        //int duration = Toast.LENGTH_LONG;
        //String toastText = "MobileAP status: ";
        int state = WIFI_AP_STATE_UNKNOWN;
        try {
            wifi.setWifiEnabled(false);
            Method method1 = wifi.getClass().getMethod("setWifiApEnabled",
                WifiConfiguration.class, boolean.class);
            method1.invoke(wifi, null, enabled); // true
            Method method2 = wifi.getClass().getMethod("getWifiApState");
            state = (Integer) method2.invoke(wifi);
        } catch (Exception e) {
           Log.e(WIFI_SERVICE, e.getMessage());
           // toastText += "ERROR " + e.getMessage();
        }

        if (!enabled) {
            int loopMax = 10;
            while (loopMax>0 && (getWifiAPState()==WIFI_AP_STATE_DISABLING
                    || getWifiAPState()==WIFI_AP_STATE_ENABLED
                    || getWifiAPState()==WIFI_AP_STATE_FAILED)) {
                try {Thread.sleep(500);loopMax--;} catch (Exception e) {}
            }
            wifi.setWifiEnabled(true);
        } else if (enabled) {
            int loopMax = 10;
            while (loopMax>0 && (getWifiAPState()==WIFI_AP_STATE_ENABLING
                    || getWifiAPState()==WIFI_AP_STATE_DISABLED
                    || getWifiAPState()==WIFI_AP_STATE_FAILED)) {
                try {Thread.sleep(500);loopMax--;} catch (Exception e) {}
            }
        }

        return state;
    }


    private int getWifiAPState() {
        int state = WIFI_AP_STATE_UNKNOWN;
        try {
            Method method2 = wifi.getClass().getMethod("getWifiApState");
            state = (Integer) method2.invoke(wifi);
        } catch (Exception e) {}
        Log.d("WifiAP", "getWifiAPState.state " + (state==-1?"UNKNOWN":WIFI_STATE_TEXTSTATE[state]));
        return state;
    }

    private void updateStatusDisplay() {

        if (getWifiAPState()==WIFI_AP_STATE_ENABLED || getWifiAPState()==WIFI_AP_STATE_ENABLING) {
            ((Button)findViewById(R.id.btnWifiToggle)).setText("Turn off");
            findViewById(R.id.bg).setBackgroundResource(R.drawable.bg_wifi_on);
        } else {
            ((Button)findViewById(R.id.btnWifiToggle)).setText("Turn on");
            findViewById(R.id.bg).setBackgroundResource(R.drawable.bg_wifi_off);
        }

    }


    class SetWifiAPTask extends AsyncTask<Void, Void, Void> {

        boolean mMode;
        boolean mFinish;

        public SetWifiAPTask(boolean mode, boolean finish) {
            mMode = mode;
            mFinish = finish;
        }

        ProgressDialog d = new ProgressDialog(WifiAP.this);

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            d.setTitle("Turning WiFi AP " + (mMode?"on":"off") + "...");
            d.setMessage("...please wait a moment.");
            d.show();
        }

        @Override
        protected void onPostExecute(Void aVoid) {
            super.onPostExecute(aVoid);
            try {d.dismiss();} catch (IllegalArgumentException e) {};
            updateStatusDisplay();
            if (mFinish) finish();
        }

        @Override
        protected Void doInBackground(Void... params) {
            setWifiApEnabled(mMode);
            return null;
        }
    }


}
于 2011-08-13T06:51:36.397 回答
17

对于任何有兴趣在 ICS 上工作、设置您的 AP 名称和/或将所有 WifiAP 代码保留在自己的类中的人，我已经更新并改进了另一个答案中给出的代码：

WifiAP.java：

package com.demo.wifiap;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiManager;
import android.os.AsyncTask;
import android.util.Log;

import java.lang.reflect.Method;

import com.demo.WifiAPActivity;

/**
 * Handle enabling and disabling of WiFi AP
 * @author http://stackoverflow.com/a/7049074/1233435
 */
public class WifiAP extends Activity {
    private static int constant = 0;

    private static final int WIFI_AP_STATE_UNKNOWN = -1;
    private static int WIFI_AP_STATE_DISABLING = 0;
    private static int WIFI_AP_STATE_DISABLED = 1;
    public int WIFI_AP_STATE_ENABLING = 2;
    public int WIFI_AP_STATE_ENABLED = 3;
    private static int WIFI_AP_STATE_FAILED = 4;

    private final String[] WIFI_STATE_TEXTSTATE = new String[] {
            "DISABLING","DISABLED","ENABLING","ENABLED","FAILED"
    };

    private WifiManager wifi;
    private String TAG = "WifiAP";

    private int stateWifiWasIn = -1;

    private boolean alwaysEnableWifi = true; //set to false if you want to try and set wifi state back to what it was before wifi ap enabling, true will result in the wifi always being enabled after wifi ap is disabled

    /**
     * Toggle the WiFi AP state
     * @param wifihandler
     * @author http://stackoverflow.com/a/7049074/1233435
     */
    public void toggleWiFiAP(WifiManager wifihandler, Context context) {
        if (wifi==null){
            wifi = wifihandler;
        }

        boolean wifiApIsOn = getWifiAPState()==WIFI_AP_STATE_ENABLED || getWifiAPState()==WIFI_AP_STATE_ENABLING;
        new SetWifiAPTask(!wifiApIsOn,false,context).execute();
    }

    /**
     * Enable/disable wifi
     * @param true or false
     * @return WifiAP state
     * @author http://stackoverflow.com/a/7049074/1233435
     */
    private int setWifiApEnabled(boolean enabled) {
        Log.d(TAG, "*** setWifiApEnabled CALLED **** " + enabled);

        WifiConfiguration config = new WifiConfiguration();
        config.SSID = "My AP";
        config.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN);

        //remember wirelesses current state
        if (enabled && stateWifiWasIn==-1){
            stateWifiWasIn=wifi.getWifiState();
        }

        //disable wireless
        if (enabled && wifi.getConnectionInfo() !=null) {
            Log.d(TAG, "disable wifi: calling");
            wifi.setWifiEnabled(false);
            int loopMax = 10;
            while(loopMax>0 && wifi.getWifiState()!=WifiManager.WIFI_STATE_DISABLED){
                Log.d(TAG, "disable wifi: waiting, pass: " + (10-loopMax));
                try {
                    Thread.sleep(500);
                    loopMax--;
                } catch (Exception e) {

                }
            }
            Log.d(TAG, "disable wifi: done, pass: " + (10-loopMax));
        }

        //enable/disable wifi ap
        int state = WIFI_AP_STATE_UNKNOWN;
        try {
            Log.d(TAG, (enabled?"enabling":"disabling") +" wifi ap: calling");
            wifi.setWifiEnabled(false);
            Method method1 = wifi.getClass().getMethod("setWifiApEnabled", WifiConfiguration.class, boolean.class);
            //method1.invoke(wifi, null, enabled); // true
            method1.invoke(wifi, config, enabled); // true
            Method method2 = wifi.getClass().getMethod("getWifiApState");
            state = (Integer) method2.invoke(wifi);
        } catch (Exception e) {
            Log.e(WIFI_SERVICE, e.getMessage());
            // toastText += "ERROR " + e.getMessage();
        }


        //hold thread up while processing occurs
        if (!enabled) {
            int loopMax = 10;
            while (loopMax>0 && (getWifiAPState()==WIFI_AP_STATE_DISABLING || getWifiAPState()==WIFI_AP_STATE_ENABLED || getWifiAPState()==WIFI_AP_STATE_FAILED)) {
                Log.d(TAG, (enabled?"enabling":"disabling") +" wifi ap: waiting, pass: " + (10-loopMax));
                try {
                    Thread.sleep(500);
                    loopMax--;
                } catch (Exception e) {

                }
            }
            Log.d(TAG, (enabled?"enabling":"disabling") +" wifi ap: done, pass: " + (10-loopMax));

            //enable wifi if it was enabled beforehand
            //this is somewhat unreliable and app gets confused and doesn't turn it back on sometimes so added toggle to always enable if you desire
            if(stateWifiWasIn==WifiManager.WIFI_STATE_ENABLED || stateWifiWasIn==WifiManager.WIFI_STATE_ENABLING || stateWifiWasIn==WifiManager.WIFI_STATE_UNKNOWN || alwaysEnableWifi){
                Log.d(TAG, "enable wifi: calling");
                wifi.setWifiEnabled(true);
                //don't hold things up and wait for it to get enabled
            }

            stateWifiWasIn = -1;
        } else if (enabled) {
            int loopMax = 10;
            while (loopMax>0 && (getWifiAPState()==WIFI_AP_STATE_ENABLING || getWifiAPState()==WIFI_AP_STATE_DISABLED || getWifiAPState()==WIFI_AP_STATE_FAILED)) {
                Log.d(TAG, (enabled?"enabling":"disabling") +" wifi ap: waiting, pass: " + (10-loopMax));
                try {
                    Thread.sleep(500);
                    loopMax--;
                } catch (Exception e) {

                }
            }
            Log.d(TAG, (enabled?"enabling":"disabling") +" wifi ap: done, pass: " + (10-loopMax));
        }
        return state;
    }

    /**
     * Get the wifi AP state
     * @return WifiAP state
     * @author http://stackoverflow.com/a/7049074/1233435
     */
    public int getWifiAPState() {
        int state = WIFI_AP_STATE_UNKNOWN;
        try {
            Method method2 = wifi.getClass().getMethod("getWifiApState");
            state = (Integer) method2.invoke(wifi);
        } catch (Exception e) {

        }

        if(state>=10){
            //using Android 4.0+ (or maybe 3+, haven't had a 3 device to test it on) so use states that are +10
            constant=10;
        }

        //reset these in case was newer device
        WIFI_AP_STATE_DISABLING = 0+constant;
        WIFI_AP_STATE_DISABLED = 1+constant;
        WIFI_AP_STATE_ENABLING = 2+constant;
        WIFI_AP_STATE_ENABLED = 3+constant;
        WIFI_AP_STATE_FAILED = 4+constant;

        Log.d(TAG, "getWifiAPState.state " + (state==-1?"UNKNOWN":WIFI_STATE_TEXTSTATE[state-constant]));
        return state;
    }

    /**
     * the AsyncTask to enable/disable the wifi ap
     * @author http://stackoverflow.com/a/7049074/1233435
     */
    class SetWifiAPTask extends AsyncTask<Void, Void, Void> {
        boolean mMode; //enable or disable wifi AP
        boolean mFinish; //finalize or not (e.g. on exit)
        ProgressDialog d;

        /**
         * enable/disable the wifi ap
         * @param mode enable or disable wifi AP
         * @param finish finalize or not (e.g. on exit)
         * @param context the context of the calling activity
         * @author http://stackoverflow.com/a/7049074/1233435
         */
        public SetWifiAPTask(boolean mode, boolean finish, Context context) {
            mMode = mode;
            mFinish = finish;
            d = new ProgressDialog(context);
        }

        /**
         * do before background task runs
         * @author http://stackoverflow.com/a/7049074/1233435
         */
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            d.setTitle("Turning WiFi AP " + (mMode?"on":"off") + "...");
            d.setMessage("...please wait a moment.");
            d.show();
        }

        /**
         * do after background task runs
         * @param aVoid
         * @author http://stackoverflow.com/a/7049074/1233435
         */
        @Override
        protected void onPostExecute(Void aVoid) {
            super.onPostExecute(aVoid);
            try {
                d.dismiss();
                WifiAPActivity.updateStatusDisplay();
            } catch (IllegalArgumentException e) {

            };
            if (mFinish){
                finish();
            }
        }

        /**
         * the background task to run
         * @param params
         * @author http://stackoverflow.com/a/7049074/1233435
         */
        @Override
        protected Void doInBackground(Void... params) {
            setWifiApEnabled(mMode);
            return null;
        }
    }
}

WifiAPActivity.java：

package com.demo;

import android.app.Activity;
import android.content.Context;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;

import com.demo.WifiAP;

public class WifiAPActivity extends Activity {
    //private String TAG = "WifiAPActivity";

    boolean wasAPEnabled = false;
    static WifiAP wifiAp;
    private WifiManager wifi;
    static Button btnWifiToggle;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.wifi);

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

        wifiAp = new WifiAP();
        wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);

        btnWifiToggle.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                wifiAp.toggleWiFiAP(wifi, WifiAPActivity.this);
            }
        });

        getWindow().addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD|WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON|WindowManager.LayoutParams.FLAG_DIM_BEHIND);       
    }

    @Override
    public void onResume() {
        super.onResume();
        if (wasAPEnabled) {
            if (wifiAp.getWifiAPState()!=wifiAp.WIFI_AP_STATE_ENABLED && wifiAp.getWifiAPState()!=wifiAp.WIFI_AP_STATE_ENABLING){
                wifiAp.toggleWiFiAP(wifi, WifiAPActivity.this);
            }
        }
        updateStatusDisplay();
    }

    @Override
    public void onPause() {
        super.onPause();
        boolean wifiApIsOn = wifiAp.getWifiAPState()==wifiAp.WIFI_AP_STATE_ENABLED || wifiAp.getWifiAPState()==wifiAp.WIFI_AP_STATE_ENABLING;
        if (wifiApIsOn) {
            wasAPEnabled = true;
            wifiAp.toggleWiFiAP(wifi, WifiAPActivity.this);
        } else {
            wasAPEnabled = false;
        }
        updateStatusDisplay();
    }

    public static void updateStatusDisplay() {
        if (wifiAp.getWifiAPState()==wifiAp.WIFI_AP_STATE_ENABLED || wifiAp.getWifiAPState()==wifiAp.WIFI_AP_STATE_ENABLING) {
            btnWifiToggle.setText("Turn off");
            //findViewById(R.id.bg).setBackgroundResource(R.drawable.bg_wifi_on);
        } else {
            btnWifiToggle.setText("Turn on");
            //findViewById(R.id.bg).setBackgroundResource(R.drawable.bg_wifi_off);
        }
    }
}

wifi.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <Button
        android:id="@+id/btnWifiToggle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />

</LinearLayout>

权限：

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"></uses-permission>
于 2012-05-18T00:36:02.113 回答
5

没有用于此的公共 API。

于 2011-08-13T06:06:21.133 回答