android的意图

  这是动态广播  IntentFilter filter = new IntentFilter();  filter.addAction(WifiManager.ACTION_PICK_WIFI_NETWORK);  registerReceiver(new WifiReceiver(), filter);//静态广播直接可以这样用 Intent intent = new Intent();    intent.setAction("cn.programmer.CUSTOM_INTENT");      intent.setComponent( new ComponentName( "com.app.myapplication" ,        "com.app.myapplication.MyReceiver") );//系统高级点的需要指明包名    sendBroadcast(intent);   // 动态接收广播接收class WifiReceiver extends BroadcastReceiver {    @Override    public void onReceive(Context context, Intent intent) {        WifiManager mWifiManager = (WifiManager)getApplicationContext().getSystemService(Context.WIFI_SERVICE);        String action = intent.getAction();       //textView.append(action);        Log.i("WifiReceiver", action);        // / Wifi 状态变化        if (WifiManager.SUPPLICANT_STATE_CHANGED_ACTION.equals(action)) {            WifiInfo info = mWifiManager.getConnectionInfo();            SupplicantState state = info.getSupplicantState();            if (state == SupplicantState.COMPLETED) {               // textView.append("(验证成功)");                Log.i("WifiReceiver", "(验证成功)");            }            int errorCode = intent.getIntExtra(                    WifiManager.EXTRA_SUPPLICANT_ERROR, -1);            if (errorCode == WifiManager.ERROR_AUTHENTICATING) {              //  textView.append("(验证失败)");                Log.i("WifiReceiver", "(验证失败)");            }        }    }}//动态广播之后要卸掉 应该是怕占用内存   @Overrideprotected void onDestroy() {    super.onDestroy();    unregisterReceiver(WifiReceiver);}

//
//这是静态广播
public class MyBroadcast extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action.equals(“COM.USER.LOGIN”)){
context.startActivity(new Intent(context, LoginActivity.class));
}
}
//需要在androidMainfest里面注册

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