无线扫描结果广播接收器不工作 [英] Wifi scan results broadcast receiver not working
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问题描述
我写了一个简单的广播接收器显示敬酒消息时完成无线扫描。没有什么是显示。这里是我的code：
包com.wifi;进口的java.util.List;进口android.content.BroadcastReceiver;
进口android.content.Context;
进口android.content.Intent;
进口android.net.wifi.ScanResult;
进口android.net.wifi.WifiManager;
进口android.widget.Toast;公共类wifiReceiver扩展广播接收器{
@覆盖
公共无效的onReceive（上下文的背景下，意图意图）{
Toast.makeText（上下文中，扫描完成，Toast.LENGTH_LONG）.show（）; }}
下面是清单文件：
＆LT;？XML版本=1.0编码=UTF-8＆GT？;
＆LT;清单的xmlns：机器人=http://schemas.android.com/apk/res/android
包=com.wifi
安卓版code =1
机器人：=的versionName1.0＆GT;
＆lt;应用机器人：图标=@绘制/图标机器人：标签=@字符串/ APP_NAME＆GT;
＆LT;活动机器人：无线NAME =机器人：标签=@字符串/ APP_NAME＆GT;
＆所述;意图滤光器＆gt;
＆lt;作用机器人：名字=android.intent.action.MAIN/＆GT;
＆LT;类机器人：名字=android.intent.category.LAUNCHER/＆GT;
＆所述; /意图滤光器＆gt;
＆LT; /活性GT;
＆lt;接收机器人：名字=。wifiReceiver＆GT;
＆所述;意图滤光器＆gt;
＆lt;作用机器人：名字=android.net.wifi.SCAN_RESULTS＆GT;＆LT; /作用＆gt;
＆所述; /意图滤光器＆gt;
＆LT; /接收器＆GT;
＆LT; /用途＆gt;
＆LT;使用许可权的android：NAME =android.permission.ACCESS_WIFI_STATE/＆GT;
＆LT;使用许可权的android：NAME =android.permission.CHANGE_WIFI_STATE/＆GT;
＆LT; /清单＆GT;
解决方案
好，这不是那么容易;-)结果
有几件事情失踪...
这里是一个WiFi扫描的一个例子 - 原始来源$ C $ C在这里<一款定位href=\"http://www.androidsnippets.com/scan-for-wireless-networks\">http://www.androidsnippets.com/scan-for-wireless-networks
包com.android.wifitester;进口的java.util.List;
进口android.app.Activity;
进口android.content.BroadcastReceiver;
进口android.content.Context;
进口android.content.Intent;
进口android.content.IntentFilter;
进口android.net.wifi.ScanResult;
进口android.net.wifi.WifiManager;
进口android.os.Bundle;
进口android.view.Menu;
进口android.view.MenuItem;
进口android.widget.TextView;公共类WifiTester延伸活动{
TextView中的mainText;
WifiManager mainWifi;
WifiReceiver receiverWifi;
清单＆LT; ScanResult＆GT; wifiList;
StringBuilder的SB =新的StringBuilder（）;公共无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.main）;
的mainText =（的TextView）findViewById（R.id.mainText）;
mainWifi =（WifiManager）getSystemService（Context.WIFI_SERVICE）;
receiverWifi =新WifiReceiver（）;
registerReceiver（receiverWifi，新的IntentFilter（WifiManager.SCAN_RESULTS_AVAILABLE_ACTION））;
mainWifi.startScan（）;
mainText.setText（\\\\ n起始扫描... \\\\ N）;
}公共布尔onCreateOptionsMenu（菜单菜单）{
menu.add（0，0，0，刷新）;
返回super.onCreateOptionsMenu（菜单）;
}公共布尔onMenuItemSelected（INT FEATUREID，菜单项项）{
mainWifi.startScan（）;
mainText.setText（开始扫描）;
返回super.onMenuItemSelected（FEATUREID，项目）;
}保护无效的onPause（）{
unregisterReceiver（receiverWifi）;
super.onPause（）;
}保护无效onResume（）{
registerReceiver（receiverWifi，新的IntentFilter（WifiManager.SCAN_RESULTS_AVAILABLE_ACTION））;
super.onResume（）;
}类WifiReceiver扩展广播接收器{
公共无效的onReceive（上下文C，意图意图）{
SB =新的StringBuilder（）;
wifiList = mainWifi.getScanResults（）;
的for（int i = 0; I＆LT; wifiList.size（）;我++）{
sb.append（新整数第（i + 1）的ToString（）+。）;
sb.append（（wifiList.get（I））的toString（））;
sb.append（\\\\ N）;
}
mainText.setText（某人）;
}
}
}
I have written a simple broadcast receiver to show a toast message when wifi scan is completed. Nothing is showing. Here is my code:
package com.wifi;
import java.util.List;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiManager;
import android.widget.Toast;
public class wifiReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context,"Scan completed", Toast.LENGTH_LONG).show();
}
}
Here is the manifest file:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.wifi"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".wifi" android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name=".wifiReceiver">
<intent-filter>
<action android:name="android.net.wifi.SCAN_RESULTS"></action>
</intent-filter>
</receiver>
</application>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
</manifest>
解决方案
well, it's not that easy ;-)
there are couple of things missing...
here is an example of a wifi scan - the original source code is located here http://www.androidsnippets.com/scan-for-wireless-networks
package com.android.wifitester;
import java.util.List;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
public class WifiTester extends Activity {
TextView mainText;
WifiManager mainWifi;
WifiReceiver receiverWifi;
List<ScanResult> wifiList;
StringBuilder sb = new StringBuilder();
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mainText = (TextView) findViewById(R.id.mainText);
mainWifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
receiverWifi = new WifiReceiver();
registerReceiver(receiverWifi, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
mainWifi.startScan();
mainText.setText("\\nStarting Scan...\\n");
}
public boolean onCreateOptionsMenu(Menu menu) {
menu.add(0, 0, 0, "Refresh");
return super.onCreateOptionsMenu(menu);
}
public boolean onMenuItemSelected(int featureId, MenuItem item) {
mainWifi.startScan();
mainText.setText("Starting Scan");
return super.onMenuItemSelected(featureId, item);
}
protected void onPause() {
unregisterReceiver(receiverWifi);
super.onPause();
}
protected void onResume() {
registerReceiver(receiverWifi, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
super.onResume();
}
class WifiReceiver extends BroadcastReceiver {
public void onReceive(Context c, Intent intent) {
sb = new StringBuilder();
wifiList = mainWifi.getScanResults();
for(int i = 0; i < wifiList.size(); i++){
sb.append(new Integer(i+1).toString() + ".");
sb.append((wifiList.get(i)).toString());
sb.append("\\n");
}
mainText.setText(sb);
}
}
}
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