但是如果可以直接利用wifi direct的方式連接的話，不需要連接AP就可以直接溝通了。
在MainActivity.java中，透過implement WifiP2pManager.PeerListListener, 以及WifiP2pManager.ConnectionInfoListener來做。
這個寫法是直接搜尋附近最近一個可以連線的裝置，找到之後會自動連線。
完整程式碼 MainActivity.java:
import android.annotation.SuppressLint;
import android.bluetooth.BluetoothAdapter;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.NetworkInfo;
import android.net.wifi.WifiManager;
import android.net.wifi.WpsInfo;
import android.net.wifi.p2p.WifiP2pConfig;
import android.net.wifi.p2p.WifiP2pDevice;
import android.net.wifi.p2p.WifiP2pDeviceList;
import android.net.wifi.p2p.WifiP2pGroup;
import android.net.wifi.p2p.WifiP2pInfo;
import android.net.wifi.p2p.WifiP2pManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity implements WifiP2pManager.PeerListListener, WifiP2pManager.ConnectionInfoListener {
private final String TAG = "MainActivity";
private boolean isDeviceFound = false;
private TextView tvMacAddress, tvConnectDevice, tvConnectStatus;
private WifiP2pManager.Channel mChannel;
private WifiP2pManager mWifiP2pManager;
private final IntentFilter intentFilter = new IntentFilter();
private List peers = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// find view by id
tvMacAddress = (TextView)findViewById(R.id.id_tvMacAddress);
tvConnectDevice = (TextView)findViewById(R.id.id_tvConnectDevice);
tvConnectStatus = (TextView)findViewById(R.id.id_tvConnectStatus);
disconnectFunc();
WifiManager mWifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
BluetoothAdapter myDevice = BluetoothAdapter.getDefaultAdapter();
if (mWifiManager != null) {
// Turn on wifi
mWifiManager.setWifiEnabled(true);
// get my device and mac address
tvMacAddress.setText(myDevice.getName() + ", MAC[" + mWifiManager.getConnectionInfo().getMacAddress() + "]");
}
// setup wifi p2p
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);
registerReceiver(mReceiver, intentFilter);
mWifiP2pManager = (WifiP2pManager) getSystemService(Context.WIFI_P2P_SERVICE);
mChannel = mWifiP2pManager.initialize(this, getMainLooper(), null);
mWifiP2pManager.discoverPeers(mChannel, new WifiP2pManager.ActionListener() {
@Override
public void onSuccess() {
Log.d(TAG,"discoverPeers onSuccess");
}
@Override
public void onFailure(int reasonCode) {
Log.d(TAG,"discoverPeers onFailure");
}
});
}
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (WifiP2pManager.WIFI_P2P_STATE_CHANGED_ACTION.equals(action)) {
Log.d(TAG,"WIFI_P2P_STATE_CHANGED_ACTION");
}
else if (WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION.equals(action)) {
Log.d(TAG,"WIFI_P2P_PEERS_CHANGED_ACTION");
if (mWifiP2pManager != null) {
mWifiP2pManager.requestPeers(mChannel, MainActivity.this);
}
}
else if (WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION.equals(action)) {
Log.d(TAG,"WIFI_P2P_CONNECTION_CHANGED_ACTION");
if (mWifiP2pManager == null) {
return;
}
NetworkInfo networkInfo = (NetworkInfo) intent.getParcelableExtra(WifiP2pManager.EXTRA_NETWORK_INFO);
if (networkInfo.isConnected()) {
mWifiP2pManager.requestConnectionInfo(mChannel, MainActivity.this);
}
}
else if (WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION.equals(action)) {
Log.d(TAG,"WIFI_P2P_THIS_DEVICE_CHANGED_ACTION");
}
}
};
// search available devices and auto connect first one
@Override
public void onPeersAvailable(WifiP2pDeviceList peerList) {
peers.clear();
peers.addAll(peerList.getDeviceList());
String[] peersMacAddress, peersDeviceName;
if (peers.size() == 0) {
Log.d(TAG, "No devices found");
tvConnectStatus.setText("no connected");
peersMacAddress = new String[1];
peersMacAddress[0]="No Devices found";
peersDeviceName = new String[1];
peersDeviceName[0]="No Devices found";
}
else{
peersMacAddress = new String[peers.size()];
peersDeviceName = new String[peers.size()];
int i=0, j=0;
for(WifiP2pDevice device: peers){
peersDeviceName[i++] = device.deviceName;
peersMacAddress[j++] = device.deviceAddress;
// find the first device and auto connect
if(device.deviceAddress.equals(peersMacAddress[0])){
tvConnectDevice.setText(peersDeviceName[0] + ", MAC[" + peersMacAddress[0] + "]");
if(!isDeviceFound){
connectFunc();
isDeviceFound = true;
}
}
}
}
}
// check connect status
@Override
public void onConnectionInfoAvailable(WifiP2pInfo info) {
tvConnectDevice.setText("Stop Searching");
tvConnectStatus.setText("Device already connected");
}
private void connectFunc(){
Log.d(TAG, "connectFunc");
WifiP2pDevice device = peers.get(0);
WifiP2pConfig config = new WifiP2pConfig();
config.deviceAddress = device.deviceAddress;
config.wps.setup = WpsInfo.PBC;
mWifiP2pManager.connect(mChannel, config, new WifiP2pManager.ActionListener() {
@Override
public void onSuccess() {
Log.d(TAG,"connect success");
tvConnectStatus.setText("device connected");
}
@Override
public void onFailure(int reason) {
Log.d(TAG,"connect fail");
}
});
}
private void disconnectFunc(){
Log.d(TAG, "disconnectFunc");
if (mWifiP2pManager != null && mChannel != null) {
mWifiP2pManager.requestGroupInfo(mChannel, new WifiP2pManager.GroupInfoListener() {
@Override
public void onGroupInfoAvailable(WifiP2pGroup group) {
if (group != null && mWifiP2pManager != null && mChannel != null && group.isGroupOwner()) {
mWifiP2pManager.removeGroup(mChannel, new WifiP2pManager.ActionListener() {
@Override
public void onSuccess() {
Log.d(TAG, "removeGroup onSuccess -");
}
@Override
public void onFailure(int reason) {
Log.d(TAG, "removeGroup onFailure -" + reason);
}
});
}
}
});
}
}
}
補上xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.chris.myapplication.MainActivity">
<TextView
android:id="@+id/id_tvMyDevice"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="My Device:"
app:layout_constraintStart_toStartOf="parent" />
<TextView
android:id="@+id/id_tvMacAddress"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="My Mac Address"
app:layout_constraintTop_toBottomOf="@+id/id_tvMyDevice" />
<TextView
android:id="@+id/id_tvDeviceFound"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:text="Device Found:"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/id_tvMacAddress" />
<TextView
android:id="@+id/id_tvConnectDevice"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Searching..."
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/id_tvDeviceFound" />
<TextView
android:id="@+id/id_tvConnectStatus"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:text="no connected"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/id_tvConnectDevice" />
</android.support.constraint.ConstraintLayout>
在AndroidManifest.xml加入權限:
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/> <uses-permission android:name="android.permission.BLUETOOTH"/> <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" /> <uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
連線成功之後，接下來有時間再來寫加入UDP傳輸試試看。
END
沒有留言:
張貼留言