[英]Pass a value from broadcastreceiver class to main activity in wifi direct
我想将WiFiDirectBroadcastReceiver中的字符串变量result中的值发送到WiFiDirectActivity ,我尝试这样做,如下所示。
但是当我运行该应用程序时,它一直在寻找同伴。 当我评论这些添加的行(WiFiDirectBroadcastReceiver的最后3行)时,它可以正常工作。
添加了WiFiDirectBroadcastReceiver中onReceive函数的代码以及WiFiDirectActivity中的upResume () 。
如何将该值传递给WiFiDirectActivity? 我在这里想念什么?
WiFiDirectBroadcastReceiver.java
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
//if (MyIntentService.ACTION_MyIntentService.equals(action))
// {
//result = intent.getStringExtra(MyIntentService.EXTRA_KEY_OUT);
result = "hello";
//}
if (WifiP2pManager.WIFI_P2P_STATE_CHANGED_ACTION.equals(action)) {
// UI update to indicate wifi p2p status.
int state = intent.getIntExtra(WifiP2pManager.EXTRA_WIFI_STATE, -1);
if (state == WifiP2pManager.WIFI_P2P_STATE_ENABLED) {
// Wifi Direct mode is enabled
activity.setIsWifiP2pEnabled(true);
} else {
activity.setIsWifiP2pEnabled(false);
activity.resetData();
}
Log.d(WiFiDirectActivity.TAG, "P2P state changed - " + state);
} else if (WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION.equals(action)) {
// request available peers from the wifi p2p manager. This is an
// asynchronous call and the calling activity is notified with a
// callback on PeerListListener.onPeersAvailable()
if (manager != null) {
manager.requestPeers(channel, (PeerListListener) activity.getFragmentManager()
.findFragmentById(R.id.frag_list));
}
Log.d(WiFiDirectActivity.TAG, "P2P peers changed");
} else if (WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION.equals(action)) {
if (manager == null) {
return;
}
NetworkInfo networkInfo = (NetworkInfo) intent
.getParcelableExtra(WifiP2pManager.EXTRA_NETWORK_INFO);
if (networkInfo.isConnected()) {
// we are connected with the other device, request connection
// info to find group owner IP
DeviceDetailFragment fragment = (DeviceDetailFragment) activity
.getFragmentManager().findFragmentById(R.id.frag_detail);
manager.requestConnectionInfo(channel, fragment);
//fragment.peerCountInfo=result;
//fragment.peerCt = peerCountFromDlist;
//fragment.peerNm = peerNameFromDlist;
} else {
// It's a disconnect
activity.resetData();
}
} else if (WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION.equals(action)) {
DeviceListFragment fragment = (DeviceListFragment) activity.getFragmentManager()
.findFragmentById(R.id.frag_list);
fragment.updateThisDevice((WifiP2pDevice) intent.getParcelableExtra(
WifiP2pManager.EXTRA_WIFI_P2P_DEVICE));
//peerCountFromDlist = fragment.peerTot;
//peerNameFromDlist = fragment.deviceid;
}
intent.putExtra("message",result);
intent.setClass(context, WiFiDirectActivity.class);
context.startActivity(intent);
}
WiFiDirectActivity.java
public class WiFiDirectActivity extends Activity implements ChannelListener, DeviceActionListener {
public static final String TAG = "wifidirectdemo";
private WifiP2pManager manager;
private boolean isWifiP2pEnabled = false;
private boolean retryChannel = false;
private final IntentFilter intentFilter = new IntentFilter();
private Channel channel;
private BroadcastReceiver receiver = null;
private String resultString;
private int peerCount;
/**
* @param isWifiP2pEnabled the isWifiP2pEnabled to set
*/
public void setIsWifiP2pEnabled(boolean isWifiP2pEnabled) {
this.isWifiP2pEnabled = isWifiP2pEnabled;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// add necessary intent values to be matched.
intentFilter.addAction(WifiP2pManager.WIFI_P2P_STATE_CHANGED_ACTION);
intentFilter.addAction(WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION);
intentFilter.addAction(WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION);
intentFilter.addAction(WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION);
intentFilter.addAction(MyIntentService.ACTION_MyIntentService);
manager = (WifiP2pManager) getSystemService(Context.WIFI_P2P_SERVICE);
channel = manager.initialize(this, getMainLooper(), null);
}
/** register the BroadcastReceiver with the intent values to be matched */
@Override
public void onResume() {
super.onResume();
receiver = new WiFiDirectBroadcastReceiver(manager, channel, this);
registerReceiver(receiver, intentFilter);
Bundle extras = getIntent().getExtras();
if (extras != null) {
resultString = extras.getString("message");
}
}
多亏了Mike M,我发现了一种从BroadcastReceiver向Main Activity发送一些数据的简单方法。( setIsWifiP2pEnabled(boolean isWifiP2pEnabled)方法的工作方式与此相同)
发送"message"
并将其检索到str
变量;
在MainActivity中创建一个公共方法:
public void setResult(String result){
str = result;
}
然后在BroadcastReceiver中调用它:
activity.setResult("message");
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