Android:How 使所有 activity 都可以使用套接字连接
Android:How to make all activity can use socket connections
我必须在 ActivityA 中正常建立套接字并准备发送数据，
不过现在想也可以用同一个socket连接来传输数据ActivityB.I 网上找了资料，好像可以用singleton.I 研究了几天，还是不知道怎么下手，找了一些练习题也不知道怎么用我原来的程序。
我想先在ActivityA和SERVER之间建立连接，并传一个值给SERVER，然后按下按钮切换到ActivityB，同时传值给SERVER
给点建议或者教学网站都可以，这样我才能继续研究下去，非常感谢
建立套接字方法：
public class MainActivity extends Activity {
Button Btn_Wifi,Btn_Power,Btn_Flame;
Boolean connected=false;
Boolean powerstatus=false;
DataOutputStream dataOutputStream = null;
DataInputStream dataInputStream = null ;
Socket socket = null;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mainView();
setListensers();
setButtonStatus();
}
private void mainView(){
Btn_Wifi = (Button) findViewById(R.id.Btn_Wifi);
Btn_Power = (Button) findViewById(R.id.Btn_Power);
Btn_Flame = (Button) findViewById(R.id.Btn_Flame);
}
private void setListensers(){
Btn_Wifi.setOnClickListener(BtnWifiOnClickListener);
Btn_Power.setOnClickListener(BtnPowerOnClickListener);
Btn_Flame.setOnClickListener(BtnFlameOnClickListener);
}
private void setButtonStatus(){
Btn_Power.setEnabled(false);
Btn_Flame.setEnabled(false);
}
Button.OnClickListener BtnWifiOnClickListener = new Button.OnClickListener(){
@Override
public void onClick(View view) {
if(!connected){
try {
socket = new Socket("IP", PORT);
dataOutputStream = new DataOutputStream(socket.getOutputStream());//and stream
changeConnectionStatus(true);//change the connection status
}catch (UnknownHostException e) {
changeConnectionStatus(false);
}catch (IOException e) {
changeConnectionStatus(false);
}
}else{
try {//try to close the socket
socket.close();
changeConnectionStatus(false);//change the connection status
} catch (UnknownHostException e) {//catch and
changeConnectionStatus(false);
} catch (IOException e) {//catch and
changeConnectionStatus(false);
}
}
}
};
Button.OnClickListener BtnPowerOnClickListener = new Button.OnClickListener(){
@Override
public void onClick(View view) {
if(!powerstatus){
try {
byte[] pon ={(byte) 0x10,(byte) 0x10};
dataOutputStream.write(pon);
dataOutputStream.flush();
PowerStatus(true);
}catch(Exception obj){
PowerStatus(false);
}
}else{
try {
byte[] poff ={(byte) 0x11,(byte) 0x11};
dataOutputStream.write(poff); //writeBytes(String str)
dataOutputStream.flush();
PowerStatus(false);
}catch(Exception obj){
PowerStatus(true);
}
PowerStatus(false);
}
}
};
Button.OnClickListener BtnFlameOnClickListener = new Button.OnClickListener(){
@Override
public void onClick(View view) {
Intent intent = new Intent();
intent.setClass(MainActivity.this, FlameActivity.class);
startActivity(intent);
}
};
public void changeConnectionStatus(Boolean isConnected) {
connected=isConnected;//change variable
if(isConnected){//if connection established
Btn_Wifi.setText("CONNECTED");
Btn_Power.setEnabled(true);
}else{
Btn_Wifi.setText("NOT WIFI");
Btn_Power.setText("POWER OFF");
Btn_Power.setEnabled(false);
PowerStatus(false);
}
}
public void PowerStatus(Boolean isPowerOn) {
powerstatus=isPowerOn;//change variable
if(isPowerOn){//if connection established
Btn_Power.setText("POWER ON");
Btn_Flame.setText("SET FLAME");
Btn_Flame.setEnabled(true);
}else{
Btn_Power.setText("POWER OFF");
Btn_Flame.setText("CANT SET FLAME");
Btn_Flame.setEnabled(false);
}
}
}
您当然可以通过声明来使用它，
即：在创建套接字连接的 MainActivity 中，
<code>static YourSocketClass objSocket // which creates connection
并在另一个 Activity 中使用它，只需按如下方式调用它即：<code>MainActivity.objSocket.yourMethod(any_param) .
通过声明静态你可以访问它。
public static CommunicationClient objCommunicationClient;
public boolean setConnection(final String ipAddress, final Context 上下文,
最终布尔值 isFromSearch) {</p>
<pre><code> class EstablishConnection extends AsyncTask<Void, Void, Boolean> {
ProgressDialog objDialog;
@Override
protected void onPreExecute() {
objDialog = new ProgressDialog(context);
objDialog.setMessage(context.getResources().getString(
R.string.strConnecting));
objDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
objDialog.show();
objDialog.setCancelable(false);
objDialog.setCanceledOnTouchOutside(false);
super.onPreExecute();
}
@Override
protected Boolean doInBackground(Void... params) {
boolean isConnected = false;
boolean isValid = false;
StrictMode.setThreadPolicy(policy);
objCommunicationClient = new CommunicationClient(ipAddress);
isSocketInitiated = objCommunicationClient.initSocket();
WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
WifiInfo info = wifiManager.getConnectionInfo();
CommonUtils.SSID = info.getSSID();
if (!isSocketInitiated) {
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(
getApplicationContext(),
getResources().getString(
R.string.strCantConnect),
Toast.LENGTH_LONG).show();
}
});
} else {
isConnected = true;
if (!isFromSearch) {
CommonUtils.IP = ipAddress;
try {
objCommunicationClient.sendRequest(context,
"<APP_SPECIFIC>");
} catch (Exception e) {
e.printStackTrace();
}
} else {
isValid = isFromSearch;
}
if (isValid) {
final Intent objIntentToGraph = new Intent(context,
GraphDataActivity.class);
objIntentToGraph
.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
runOnUiThread(new Runnable() {
@Override
public void run() {
startActivity(objIntentToGraph);
overridePendingTransition(
R.anim.slide_in_right,
R.anim.slide_out_left);
finish();
}
});
}
}
return isConnected;
}
@Override
protected void onPostExecute(Boolean result) {
try {
objDialog.cancel();
} catch (Exception err) {
err.printStackTrace();
}
super.onPostExecute(result);
}
}
boolean status = false;
try {
status = new EstablishConnection().execute().get();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
return status;
}
}
// 在我的另一个 Activity 中，我将其称为
MainActivity_HomePage.objCommunicationClient.sendRequest(
context, CommonUtils.STOP_COMMAND); //send request is method which send message to server.
我必须在 ActivityA 中正常建立套接字并准备发送数据， 不过现在想也可以用同一个socket连接来传输数据ActivityB.I 网上找了资料，好像可以用singleton.I 研究了几天，还是不知道怎么下手，找了一些练习题也不知道怎么用我原来的程序。
我想先在ActivityA和SERVER之间建立连接，并传一个值给SERVER，然后按下按钮切换到ActivityB，同时传值给SERVER
给点建议或者教学网站都可以，这样我才能继续研究下去，非常感谢
建立套接字方法：
public class MainActivity extends Activity {
Button Btn_Wifi,Btn_Power,Btn_Flame;
Boolean connected=false;
Boolean powerstatus=false;
DataOutputStream dataOutputStream = null;
DataInputStream dataInputStream = null ;
Socket socket = null;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mainView();
setListensers();
setButtonStatus();
}
private void mainView(){
Btn_Wifi = (Button) findViewById(R.id.Btn_Wifi);
Btn_Power = (Button) findViewById(R.id.Btn_Power);
Btn_Flame = (Button) findViewById(R.id.Btn_Flame);
}
private void setListensers(){
Btn_Wifi.setOnClickListener(BtnWifiOnClickListener);
Btn_Power.setOnClickListener(BtnPowerOnClickListener);
Btn_Flame.setOnClickListener(BtnFlameOnClickListener);
}
private void setButtonStatus(){
Btn_Power.setEnabled(false);
Btn_Flame.setEnabled(false);
}
Button.OnClickListener BtnWifiOnClickListener = new Button.OnClickListener(){
@Override
public void onClick(View view) {
if(!connected){
try {
socket = new Socket("IP", PORT);
dataOutputStream = new DataOutputStream(socket.getOutputStream());//and stream
changeConnectionStatus(true);//change the connection status
}catch (UnknownHostException e) {
changeConnectionStatus(false);
}catch (IOException e) {
changeConnectionStatus(false);
}
}else{
try {//try to close the socket
socket.close();
changeConnectionStatus(false);//change the connection status
} catch (UnknownHostException e) {//catch and
changeConnectionStatus(false);
} catch (IOException e) {//catch and
changeConnectionStatus(false);
}
}
}
};
Button.OnClickListener BtnPowerOnClickListener = new Button.OnClickListener(){
@Override
public void onClick(View view) {
if(!powerstatus){
try {
byte[] pon ={(byte) 0x10,(byte) 0x10};
dataOutputStream.write(pon);
dataOutputStream.flush();
PowerStatus(true);
}catch(Exception obj){
PowerStatus(false);
}
}else{
try {
byte[] poff ={(byte) 0x11,(byte) 0x11};
dataOutputStream.write(poff); //writeBytes(String str)
dataOutputStream.flush();
PowerStatus(false);
}catch(Exception obj){
PowerStatus(true);
}
PowerStatus(false);
}
}
};
Button.OnClickListener BtnFlameOnClickListener = new Button.OnClickListener(){
@Override
public void onClick(View view) {
Intent intent = new Intent();
intent.setClass(MainActivity.this, FlameActivity.class);
startActivity(intent);
}
};
public void changeConnectionStatus(Boolean isConnected) {
connected=isConnected;//change variable
if(isConnected){//if connection established
Btn_Wifi.setText("CONNECTED");
Btn_Power.setEnabled(true);
}else{
Btn_Wifi.setText("NOT WIFI");
Btn_Power.setText("POWER OFF");
Btn_Power.setEnabled(false);
PowerStatus(false);
}
}
public void PowerStatus(Boolean isPowerOn) {
powerstatus=isPowerOn;//change variable
if(isPowerOn){//if connection established
Btn_Power.setText("POWER ON");
Btn_Flame.setText("SET FLAME");
Btn_Flame.setEnabled(true);
}else{
Btn_Power.setText("POWER OFF");
Btn_Flame.setText("CANT SET FLAME");
Btn_Flame.setEnabled(false);
}
}
}
您当然可以通过声明来使用它，
即：在创建套接字连接的 MainActivity 中，<code>static YourSocketClass objSocket // which creates connection
并在另一个 Activity 中使用它，只需按如下方式调用它即：<code>MainActivity.objSocket.yourMethod(any_param) .
通过声明静态你可以访问它。
public static CommunicationClient objCommunicationClient;
public boolean setConnection(final String ipAddress, final Context 上下文,
最终布尔值 isFromSearch) {</p>
<pre><code> class EstablishConnection extends AsyncTask<Void, Void, Boolean> {
ProgressDialog objDialog;
@Override
protected void onPreExecute() {
objDialog = new ProgressDialog(context);
objDialog.setMessage(context.getResources().getString(
R.string.strConnecting));
objDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
objDialog.show();
objDialog.setCancelable(false);
objDialog.setCanceledOnTouchOutside(false);
super.onPreExecute();
}
@Override
protected Boolean doInBackground(Void... params) {
boolean isConnected = false;
boolean isValid = false;
StrictMode.setThreadPolicy(policy);
objCommunicationClient = new CommunicationClient(ipAddress);
isSocketInitiated = objCommunicationClient.initSocket();
WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
WifiInfo info = wifiManager.getConnectionInfo();
CommonUtils.SSID = info.getSSID();
if (!isSocketInitiated) {
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(
getApplicationContext(),
getResources().getString(
R.string.strCantConnect),
Toast.LENGTH_LONG).show();
}
});
} else {
isConnected = true;
if (!isFromSearch) {
CommonUtils.IP = ipAddress;
try {
objCommunicationClient.sendRequest(context,
"<APP_SPECIFIC>");
} catch (Exception e) {
e.printStackTrace();
}
} else {
isValid = isFromSearch;
}
if (isValid) {
final Intent objIntentToGraph = new Intent(context,
GraphDataActivity.class);
objIntentToGraph
.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
runOnUiThread(new Runnable() {
@Override
public void run() {
startActivity(objIntentToGraph);
overridePendingTransition(
R.anim.slide_in_right,
R.anim.slide_out_left);
finish();
}
});
}
}
return isConnected;
}
@Override
protected void onPostExecute(Boolean result) {
try {
objDialog.cancel();
} catch (Exception err) {
err.printStackTrace();
}
super.onPostExecute(result);
}
}
boolean status = false;
try {
status = new EstablishConnection().execute().get();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
return status;
}
} // 在我的另一个 Activity 中，我将其称为
MainActivity_HomePage.objCommunicationClient.sendRequest(
context, CommonUtils.STOP_COMMAND); //send request is method which send message to server.