package com.example.its.dem;
import android.os.AsyncTask;
import android.util.Log;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.Socket;
public class MessageSender extends AsyncTask<String,Void,Void> {
PrintWriter pw;
// BufferedReader in ;
@Override
protected Void doInBackground(String... strings) {
String message = strings[0];
try {
pw = new PrintWriter(MainActivity.s.getOutputStream());
pw.write(message);
pw.flush();
pw.close();
} catch (IOException e) {
Log.i("oii",e.toString());
e.printStackTrace();
}
return null;
}
}
it is the messagesender class in which i want to write the msg in background task.
////////////////////////////////////////////////////////////////
MAIN_ACTIVITY
package com.example.its.dem;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import java.io.IOException;
import java.net.Socket;
public class MainActivity extends AppCompatActivity {
public static Socket s;
EditText ipaddresse,porte,msz;
public static String string;
public int connected=0;
MessageSender messageSender = new MessageSender();
String ipaddress;
int port;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ipaddresse = (EditText)findViewById(R.id.e);
porte = (EditText)findViewById(R.id.e1);
msz = (EditText)findViewById(R.id.e2);
}
public void send(View v){
if(connected==1) {
string = msz.getText().toString();
Toast.makeText(this, string, Toast.LENGTH_SHORT).show();
messageSender.execute(string);
}
else{
Toast.makeText(this,"please establish connection first",Toast.LENGTH_SHORT).show();
}
}
public void connect(View view) {
ipaddress = ipaddresse.getText().toString();
port = Integer.parseInt(porte.getText().toString());
try {
s = new Socket("192.168.0.102", 80);
messageSender.execute("Connection Established");
Toast.makeText(this, "connection stablished....", Toast.LENGTH_SHORT).show();
connected =1;
} catch (IOException e) {
Log.i("poii",e.toString());
e.printStackTrace();
}
}
public void disconnect(View view) {
if(connected==1) {
messageSender.execute("Connection terminated");
Toast.makeText(this, "connection terminated.....", Toast.LENGTH_SHORT).show();
try {
s.close();
connected = 0;
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
////////////////////////////////////////////
activity.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
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"
android:orientation="vertical"
tools:context="com.example.its.dem.MainActivity">
<EditText
android:id="@+id/e"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="ip address"
/>
<EditText
android:id="@+id/e1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="port"
/>
<EditText
android:id="@+id/e2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="msg"
/>
<Button
android:id="@+id/send"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="send"
android:text="send" />
<Button
android:id="@+id/connect"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="connect"
android:text="connect" />
<Button
android:id="@+id/disconnect"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="disconnect"
android:text="disconnect" />
</LinearLayout>
/////////////////////////////////
error show
06/02 15:22:41: Launching app
$ adb install-multiple -r -t -p com.example.its.dem G:\android project\dem\app\build\outputs\apk\debug\app-debug.apk
Split APKs installed
$ adb shell am start -n "com.example.its.dem/com.example.its.dem.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
Client not ready yet..Waiting for process to come online
Connected to process 17753 on device xiaomi-redmi_3s-192.168.0.101:5555
Capturing and displaying logcat messages from application. This behavior can be disabled in the "Logcat output" section of the "Debugger" settings page.
W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
D/AccessibilityManager: current package=com.example.its.dem, accessibility manager mIsFinalEnabled=false, mOptimizeEnabled=false, mIsUiAutomationEnabled=false, mIsInterestedPackage=false
D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true
I/Adreno: QUALCOMM build : 10c9f68, I74772a33ad
Build Date : 02/07/17
OpenGL ES Shader Compiler Version: XE031.07.00.01
Local Branch :
Remote Branch : refs/tags/AU_LINUX_ANDROID_LA.UM.5.1_RB1.06.00.01.192.038
Remote Branch : NONE
Reconstruct Branch : NOTHING
I/OpenGLRenderer: Initialized EGL, version 1.4
W/art: Before Android 4.1, method int android.support.v7.widget.ListViewCompat.lookForSelectablePosition(int, boolean) would have incorrectly overridden the package-private method in android.widget.ListView
W/IInputConnectionWrapper: beginBatchEdit on inactive InputConnection
getSelectedText on inactive InputConnection
W/IInputConnectionWrapper: endBatchEdit on inactive InputConnection
W/IInputConnectionWrapper: getTextBeforeCursor on inactive InputConnection
W/IInputConnectionWrapper: getTextAfterCursor on inactive InputConnection
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.its.dem, PID: 17753
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293)
at android.view.View.performClick(View.java:5215)
at android.view.View$PerformClick.run(View.java:21193)
at android.os.Handler.handleCallback(Handler.java:742)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:157)
at android.app.ActivityThread.main(ActivityThread.java:5571)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:745)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:635)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:5215)
at android.view.View$PerformClick.run(View.java:21193)
at android.os.Handler.handleCallback(Handler.java:742)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:157)
at android.app.ActivityThread.main(ActivityThread.java:5571)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:745)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:635)
Caused by: android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1273)
at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:110)
at libcore.io.IoBridge.connectErrno(IoBridge.java:137)
at libcore.io.IoBridge.connect(IoBridge.java:122)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:163)
at java.net.Socket.startupSocket(Socket.java:592)
at java.net.Socket.tryAllAddresses(Socket.java:128)
at java.net.Socket.<init>(Socket.java:178)
at java.net.Socket.<init>(Socket.java:150)
at com.example.its.dem.MainActivity.connect(MainActivity.java:45)
at java.lang.reflect.Method.invoke(Native Method)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:5215)
at android.view.View$PerformClick.run(View.java:21193)
at android.os.Handler.handleCallback(Handler.java:742)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:157)
at android.app.ActivityThread.main(ActivityThread.java:5571)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:745)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:635)
I/Process: Sending signal. PID: 17753 SIG: 9
Application terminated.
/////////////////////////////////
Manifest_file
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.its.dem">
<uses-permission-sdk-23 android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission-sdk-23 android:name="android.permission.INTERNET"/>
<uses-permission-sdk-23 android:name="android.permission.CHANGE_WIFI_STATE"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
//////////////////////////////////
Please help me solve this error quickly
第1步：当客户端单击连接按钮然后连接t服务器和toast时，我想将客户端连接到服务器。单击之前我想输入服务器的IP地址和端口号。第2步：连接后我们要单击发送按钮并发送消息。第 3 步：最后，我想通过单击断开连接按钮断开连接。