我需要在 Android 2.2 (Froyo) 中调用什么 API 来创建 Wifi 热点(如网络共享和可移植热点设置项中所示)。
最佳答案
没有官方API,但是可以使用反射来处理。我知道有人说,不推荐,但恕我直言,如果 Google 出于某种原因不想提供 API,那就去他妈的吧。
以下是我在应用程序中使用的 Activity 代码,用户可以在其中启用/禁用 Wifi AP。 当你开启 Wifi AP 时,通常普通的 Wifi 会被关闭,所以当用户再次关闭 Wifi AP 后,我们会再次开启普通的 wifi。
下面的代码示例取 self 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;
}
}
}
关于Android 2.3 wifi热点API,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/7048922/