android > WiFi > 扫描附近WIFI
Activity?
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package wifi3.com;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 Wifi3Activity extends Activity { /** Called when the activity is first created. */private TextView wifiText; private WifiManager wifiManager; private StringBuilder sb; private List<ScanResult> wifiList; private WifiReceiver wifiReceiver; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); sb = new StringBuilder(); wifiText = (TextView) findViewById(R.id.wifi); wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE); wifiReceiver = new WifiReceiver(); registerReceiver(wifiReceiver, new IntentFilter( WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)); wifiManager.startScan(); wifiText.setText("\nStarting Scan\n"); } @Override public boolean onCreateOptionsMenu(Menu menu) { menu.add(0, 0, 0, "Refresh"); return super.onCreateOptionsMenu(menu); } @Override public boolean onMenuItemSelected(int featureId, MenuItem item) { wifiManager.startScan(); wifiText.setText("Starting Scan"); return super.onMenuItemSelected(featureId, item); } @Override protected void onPause() { unregisterReceiver(wifiReceiver); super.onPause(); } @Override protected void onResume() { registerReceiver(wifiReceiver, new IntentFilter( WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)); super.onResume(); } private final class WifiReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { sb = new StringBuilder(); wifiList = wifiManager.getScanResults(); for (int i = 0; i < wifiList.size(); i++) { sb.append(new Integer(i + 1).toString() + "."); sb.append((wifiList.get(i)).toString()).append("\n\n"); } wifiText.setText(sb.toString()); } } }?布局文件
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<?xml version="1.0" encoding="utf-8"?><ScrollView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent"><LinearLayout android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:id="@+id/wifi" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> </LinearLayout></ScrollView>
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Manifest?
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<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android" package="wifi3.com" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" /> <application android:icon="@drawable/ic_launcher" android:label="@string/app_name" > <activity android:name=".Wifi3Activity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application><uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission> <uses-permission android:name="android.permission.ACCESS_CHECKIN_PROPERTIES"></uses-permission> <uses-permission android:name="android.permission.WAKE_LOCK"></uses-permission> <uses-permission android:name="android.permission.INTERNET"></uses-permission> <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"></uses-permission> <uses-permission android:name="android.permission.MODIFY_PHONE_STATE"></uses-permission> </manifest>?
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其中 信号强度 ?调用 level 参数
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< 70 强
< 80 较强
< 90 较弱
<100 弱
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