添加权限

<uses-permission
		android:name="android.permission.GET_TASKS"></uses-permission>

private ListView myList;
	private ActivityManager mActivityManager;
	private Button button1;

	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.running_task);

		myList = (ListView) findViewById(R.id.listView1);

		button1 = (Button) findViewById(R.id.button1);
		button1.setOnClickListener(new Button.OnClickListener() {
			public void onClick(View v) {
				try {
					/* ActivityManager对象守系统取得ACTIVITY_SERVICE */
					mActivityManager = (ActivityManager) RunningTask.this
							.getSystemService(ACTIVITY_SERVICE);

					ArrayList<String> arylistTask = new ArrayList<String>();
					int intGetTastCounter = 30;

					/* 以getRunningTasks方法取并正在运行中的程序TaskInfo */
					List<ActivityManager.RunningTaskInfo> mRunningTasks = mActivityManager
							.getRunningTasks(intGetTastCounter);
					// List<ActivityManager.RunningServiceInfo> mRunningTasks =
					// mActivityManager.getRunningServices(intGetTastCounter);

					int i = 1;
					/* 以循环及baseActivity方式取得名称与ID */
					for (ActivityManager.RunningTaskInfo amTask : mRunningTasks)
					// for (ActivityManager.RunningServiceInfo amTask :
					// mRunningTasks)
					{
						arylistTask.add("" + (i++) + ": "
								+ amTask.baseActivity.getClassName() + "(ID="
								+ amTask.id + ")");
						// arylistTask.add("" + (i++) + ": "+ amTask.process +
						// "(ID=" + amTask.pid +")");
					}
					ArrayAdapter<String> aryAdapter1 = new ArrayAdapter<String>(
							RunningTask.this, R.layout.list_item2, arylistTask);
					if (aryAdapter1.getCount() == 0) {
						/* 当没有任何运行的操作，则提示信息 */
						Toast.makeText(RunningTask.this, "当前没有进行的任务",
								Toast.LENGTH_SHORT);
						// getResources().getText(R.string.str_err_no_running_service).toString(),

					} else {
						/* 发现后台运行程序，以ListView Widget条在出现 */
						myList.setAdapter(aryAdapter1);
					}
				} catch (SecurityException e) {
					/* 当无GET_TASKS权限时(SecurityException例?)提示信息 */
					Toast.makeText(RunningTask.this, "无GET_TASKS权限",
							Toast.LENGTH_SHORT);
				}
			}
		});
	}

        
RULE_NAME  like '%'||replace('a%b%c','%','\%')||'%' ESCAPE'\'
   

Wifi的五种状态

		WifiManager.WIFI_STATE_ENABLED//已打开
		WifiManager.WIFI_STATE_DISABLING//正在关闭
		WifiManager.WIFI_STATE_ENABLING//正在打开
		WifiManager.WIFI_STATE_DISABLED//已关闭
		WifiManager.WIFI_STATE_UNKNOWN//未知

一、打开关闭Wifi

 添加权限

<uses-permission
		android:name="android.permission.CHANGE_NETWORK_STATE"></uses-permission>
	<uses-permission
		android:name="android.permission.CHANGE_WIFI_STATE"></uses-permission>
	<uses-permission
		android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
	<uses-permission
		android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>
	<uses-permission
		android:name="android.permission.INTERNET"></uses-permission>
	<uses-permission
		android:name="android.permission.WAKE_LOCK"></uses-permission>

private ToggleButton toggleButton1;
	private WifiManager mWiFiManager01;

	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.wifi);
		
		toggleButton1 = (ToggleButton)findViewById(R.id.toggleButton1);
		/* 以getSystemService取得WIFI_SERVICE */
	    mWiFiManager01 = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);
	    
	    if(mWiFiManager01.getWifiState() == WifiManager.WIFI_STATE_ENABLED){
	    	toggleButton1.setChecked(true);
	    	toggleButton1.setEnabled(true);
	    }
	    else if(mWiFiManager01.getWifiState() == WifiManager.WIFI_STATE_DISABLED){
	    	toggleButton1.setChecked(false);
	    	toggleButton1.setEnabled(true);
	    }
	    else{
	    	toggleButton1.setChecked(false);
	    	toggleButton1.setEnabled(false);
	    }
	    
	    toggleButton1.setOnCheckedChangeListener(new ToggleButton.OnCheckedChangeListener(){

			public void onCheckedChanged(CompoundButton buttonView,
					boolean isChecked) {
				if(isChecked == true){
					mWiFiManager01.setWifiEnabled(true);
				}
				else{
					mWiFiManager01.setWifiEnabled(false);
				}
			}
	    	
	    });
	}

二、搜索wifi

private Button button1;
	private WifiManager mWiFiManager01;

	private SimpleAdapter listItemAdapter; // ListView的适配器
	private ArrayList<HashMap<String, Object>> listItem; // ListView的数据源，这里是一个HashMap的列表
	private ListView myList; // ListView控件

	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.wifi_connect);

		button1 = (Button) findViewById(R.id.button1);

		mWiFiManager01 = (WifiManager) this
				.getSystemService(Context.WIFI_SERVICE);
		mWiFiManager01.startScan();

		listItem = new ArrayList<HashMap<String, Object>>();
		listItemAdapter = new SimpleAdapter(this, listItem, R.layout.list_item,
				new String[] { "title", "text" }, new int[] { R.id.ItemTitle,
						R.id.ItemText });
		myList = (ListView) findViewById(R.id.list);
		myList.setAdapter(listItemAdapter);

		button1.setOnClickListener(new OnClickListener() {

			public void onClick(View v) {
				List<WifiConfiguration> wifiConf = mWiFiManager01
						.getConfiguredNetworks();
				
				if ((!mWiFiManager01.isWifiEnabled())
						&& (mWiFiManager01.getWifiState() != WifiManager.WIFI_STATE_ENABLING)) {
					mWiFiManager01.setWifiEnabled(true);
				}
				
				if (wifiConf.size() > 0) {
					int netWorkId = wifiConf.get(0).networkId;
					mWiFiManager01.enableNetwork(netWorkId, true);
					int index = 0;
					for (WifiConfiguration singleWifiConf : wifiConf) {
						addItem((index + 1) + " SSID." + singleWifiConf.SSID, "NetWorkID:"
								+ singleWifiConf.networkId);
						index = index + 1;
					}
				}

			}

		});
	}

	private void addItem(String title, String str) {
		HashMap<String, Object> map = new HashMap<String, Object>();
		map.put("title", title);
		map.put("text", str);
		listItem.add(map);
		listItemAdapter.notifyDataSetChanged();
	}