以下代码无法运行，请修改以下：public class MainActivity4 extends AppCompatActivity { public static final String TAG = "petgrowing"; TextView show; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main4); show = findViewById(R.id.tv_res); } public void onClick(View btn) { Log.i(TAG, "onClick"); // 使用 Runnable 接口来动态创建新线程 new Thread(() -> { Log.i(TAG, "线程已运行"); try { Log.i(TAG, "run:正在工作..."); Document doc = Jsoup.connect("https://chl.cn/?jinri").get(); Log.i(TAG, "title=" + doc.title()); Elements tables = doc.getElementsByTag("table"); Element table1 = tables.first(); Log.i(TAG, "run:table=" + table1); Elements tds = table1.getElementsByTag("td"); Element td1 = tds.first(); Element td2 = tds.get(4); final String retStr = ("1:" + td1.text() + " 2:" + td2.text()); // 根据获取的数据更新 UI 线程上 TextView 的内容 runOnUiThread(() -> show.setText(retStr)); } catch (MalformedURLException e) { throw new RuntimeException(e); } catch (IOException e) { throw new RuntimeException(e); } }).start(); // 启动新线程 } }

Android UI编程基础：EditText与TextView交互

public class MainActivity extends Activity { // ... @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // 获取XML...

Android基础教程：EditText与TextView UI编程实战

public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // 设置布局 // 对...

package com.example.myapplication; import androidx.appcompat.app.AppCompatActivity; import android.app.Presentation; import android.content.Context; import android.hardware.display.DisplayManager; import android.os.Bundle; import android.util.Log; import android.view.Display; import android.widget.TextView; // 继承自 Presentation 类，用于显示在外部显示设备上的内容 class MyPresentation extends Presentation { private TextView mText; public MyPresentation(Context context, Display display) { super(context, display); } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // 为这个 Presentation 设置布局 setContentView(R.layout.presentation_layout); // 获取布局中的 TextView，并设置显示文本 mText = findViewById(R.id.presentation_text); mText.setText("This is my presentation!"); } } public class MainActivity extends AppCompatActivity { private static final String TAG = "MainActivity"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // 获取 DisplayManager 实例 DisplayManager displayManager = (DisplayManager) getSystemService(Context.DISPLAY_SERVICE); // 获取所有的外部显示设备 Display[] displays = displayManager.getDisplays(DisplayManager.DISPLAY_CATEGORY_PRESENTATION); // 如果有外部显示设备，则在第一个设备上显示内容 if (displays.length > 0) { MyPresentation presentation = new MyPresentation(this, displays[0]); presentation.show(); } else { Log.e(TAG, "No external displays found!"); } } }

这是一个 Android 应用程序的代码，它展示了如何在外部显示设备上显示内容。应用程序中定义了一个 MyPresentation 类，它继承自 Presentation 类，用于显示在外部显示设备上的内容。在 MainActivity 中，获取了 ...

package com.example.restaurantapp; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TextView; public class MainActivity2 extends AppCompatActivity { Button button = findViewById(R.id.button); TextView textView = findViewById(R.id.textView); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main2); } button.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { textView.setText("Button Clicked"); }}); }

public class MainActivity2 extends AppCompatActivity { Button button; TextView textView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); ...

下面这段代码的作用是什么public class MainActivity extends AppCompatActivity { private GridView mGridView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mGridView = findViewById(R.id.grid_view); mGridView.setAdapter(new GridAdapter(this)); } private class GridAdapter extends BaseAdapter { private Context mContext; public GridAdapter(Context context) { mContext = context; } @Override public int getCount() { return 6; // 6个item } @Override public Object getItem(int position) { return null; } @Override public long getItemId(int position) { return 0; } @Override public View getView(int position, View convertView, ViewGroup parent) { if (convertView == null) { convertView = LayoutInflater.from(mContext).inflate(R.layout.grid_item, parent, false); } // 设置图片和文字 ImageView imageView = convertView.findViewById(R.id.image); imageView.setImageResource(R.drawable.ic_launcher_background); TextView textView = convertView.findViewById(R.id.text); textView.setText("Item " + position); return convertView; } } }

这段代码是一个 Android 应用程序的主活动（MainActivity），它创建了一个包含六个项目的 GridView，并使用 GridAdapter 类提供了每个项目的布局和数据。GridAdapter 是一个内部类，继承了 BaseAdapter 类，用于提供...

public class MainActivity extends AppCompatActivity { private Handler mHandler = new Handler(); private Runnable mRunnable; private TextView mTextView; private int mCount = 0; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mTextView = findViewById(R.id.text_view); // 创建一个定时任务，每隔1秒钟更新一次数据 mRunnable = new Runnable() { @Override public void run() { mCount++; mTextView.setText("Count: " + mCount); mHandler.postDelayed(this, 1000); } }; // 启动定时任务 mHandler.postDelayed(mRunnable, 1000); } @Override protected void onDestroy() { super.onDestroy(); // 停止定时任务 mHandler.removeCallbacks(mRunnable); }}在里面添加一个链接button的代码

public void onClick(View v) { // 打开链接的代码 Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("https://www.example.com")); startActivity(intent); } }); 请确保在布局文件 activity_...

转js代码 import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.widget.SeekBar; import android.widget.TextView; public class MainActivity extends AppCompatActivity { private TextView minTextView, maxTextView; private SeekBar seekBar; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); minTextView = findViewById(R.id.min_text); maxTextView = findViewById(R.id.max_text); seekBar = findViewById(R.id.range_seekbar); // 设置最小和最大值 final int minValue = 0; final int maxValue = 100; // 设置SeekBar的最小和最大值 seekBar.setMax(maxValue - minValue); seekBar.setProgress(0); // 设置初始文本 minTextView.setText(String.valueOf(minValue)); maxTextView.setText(String.valueOf(maxValue)); // 设置SeekBar的监听器 seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { // 根据SeekBar的进度计算当前值 int currentValue = progress + minValue; // 更新文本显示 minTextView.setText(String.valueOf(currentValue)); } @Override public void onStartTrackingTouch(SeekBar seekBar) { // 不需要做任何事情 } @Override public void onStopTrackingTouch(SeekBar seekBar) { // 不需要做任何事情 } }); } }

这是一个安卓的Java代码，无法直接转换为JavaScript代码。Java和JavaScript是两种不同的编程语言，它们的语法和用法也有很大的区别。如果您需要在JavaScript中实现相似的功能，您需要采用不同的方法。以下是一个...

public class MainActivity extends AppCompatActivity { private TextView countdownTextView; private int countdownTime = 5; private Handler handler = new Handler(); private Runnable countdownRunnable = new Runnable() { @Override public void run() { countdownTime--; countdownTextView.setText(String.valueOf(countdownTime)); if (countdownTime > 0) { handler.postDelayed(this, 1000); } else { // 倒计时结束后的操作 countdownTextView.setText("倒计时结束"); } } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); countdownTextView = findViewById(R.id.countdown_text_view); handler.postDelayed(countdownRunnable, 1000); }} 以上代码怎么取消倒计时

要取消倒计时，可以使用Handler的removeCallbacks方法来...@Override protected void onPause() { super.onPause(); handler.removeCallbacks(countdownRunnable); } 这样就可以在Activity暂停时取消倒计时了。

public class MainActivity extends AppCompatActivity { private EditText numberEditText; private Button sendButton; private BroadcastReceiver broadcastReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { int result = intent.getIntExtra("factorial", 0); textView.setText("Factorial: " + result); } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); numberEditText = findViewById(R.id.numberEditText); sendButton = findViewById(R.id.sendButton); sendButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { int number = Integer.parseInt(numberEditText.getText().toString()); Intent intent = new Intent("com.example.FACTORIAL_ACTION"); intent.putExtra("number", number); sendBroadcast(intent); } }); } @Override protected void onResume() { super.onResume(); IntentFilter filter = new IntentFilter("com.example.FACTORIAL_ACTION"); registerReceiver(broadcastReceiver, filter); } @Override protected void onPause() { super.onPause(); unregisterReceiver(broadcastReceiver); } }

这段代码是一个示例的 MainActivity 类，它包含了一个 EditText、一个 Button 和一个 BroadcastReceiver。在这段代码中，我们首先定义了一个 BroadcastReceiver，它的作用是接收广播并执行相应的操作。在 ...

package com.example.ibm; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import androidx.appcompat.app.AppCompatActivity; import com.google.gson.Gson; import java.io.IOException; import okhttp3.Call; import okhttp3.Callback; import okhttp3.OkHttpClient; import okhttp3.Request; import okhttp3.Response; public class MainActivity extends AppCompatActivity { private EditText etHeight; private EditText etWeight; private Button btnCalculate; private TextView tvResult; private OkHttpClient client; private Gson gson; private static final String API_KEY = "d889e63ef7ad041b837dcc1b3ebc5a2b"; private static final String API_URL = "http://apis.juhe.cn/fapig/calculator/weight"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); etHeight = findViewById(R.id.et_height); etWeight = findViewById(R.id.et_weight); btnCalculate = findViewById(R.id.btn_calculate); tvResult = findViewById(R.id.tv_result); client = new OkHttpClient(); gson = new Gson(); btnCalculate.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { String height = etHeight.getText().toString(); String weight = etWeight.getText().toString(); if (height.isEmpty() || weight.isEmpty()) { tvResult.setText("请输入身高和体重"); return; } float h = Float.parseFloat(height); float w = Float.parseFloat(weight); if (h <= 0 || w <= 0) { tvResult.setText("身高和体重必须大于0"); return; } calculateBMI(h, w); } }); }

这是一个 Android 应用程序的 Java 代码，主要实现了计算用户的 BMI 值的功能。在 onCreate 方法中，首先通过 findViewById 方法获取了布局文件中的 EditText、Button 和 TextView 控件，并设置了 OkHttpClient 和 ...

解释代码package com.example.myapplication_7; import android.annotation.SuppressLint; import android.os.Handler; import android.os.Message; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; import androidx.annotation.NonNull; import androidx.appcompat.app.AppCompatActivity; import java.util.Random; public class MainActivity extends AppCompatActivity { public static final int MSG_CODE = 87987987; public static final int MAX_NUMBER = 20; public static final int RANDOM_NUMBER = 500; private TextView result_View,cd_view; private Button start_Btn; private ImageView diglet_View; private int totalCount,hitCount,steps,delayTime; private int[][] position_Array; //将消息传给主线程 private Handler handler = new Handler(){ @SuppressLint("HandlerLeak") @Override public void handleMessage(@NonNull Message msg) { super.handleMessage(msg); switch (msg.what){ case MSG_CODE: //点击次数大于20时游戏结束 if (totalCount > MAX_NUMBER){ clear(); //游戏结束，Toast弹窗提示 Toast.makeText(MainActivity.this, "游戏结束", Toast.LENGTH_SHORT).show(); return; } int cc = MAX_NUMBER-totalCount; cd_view.setText("已出现了"+totalCount+"只地鼠，还剩"+cc+"只地鼠"); steps = msg.arg1; MainActivity.this.diglet_View.setX(MainActivity.this.position_Array[steps][0]); MainActivity.this.diglet_View.setY(MainActivity.this.position_Array[steps][1]); MainActivity.this.diglet_View.setVisibility(View.VISIBLE); int randomTime = new Random().nextInt(RANDOM_NUMBER) + RANDOM_NUMBER; MainActivity.this.code(randomTime); break; } } };

这段代码是一个 Android 应用的主活动类 MainActivity，其中包含了一些成员变量和方法。其中成员变量包括了一些常量，如 MSG_CODE、MAX_NUMBER 和 RANDOM_NUMBER，以及一些用于显示游戏结果的 TextView 和 ImageView...

public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); TextView tv_hello=findViewById(R.id.tv_hello); tv_hello.setText("今天天气很闷热，来杯冷饮"); tv_hello.setTextColor(Color.RED); tv_hello.setTextSize(30); } public static int getScreenWidth(Context context){ WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE); DisplayMetrics dm = new DisplayMetrics(); wm.getDefaultDisplay().getMetrics(dm); return dm.widthPixels; } }

这是一个 Android 开发中的 MainActivity 类，主要实现了在界面上显示一段文本，并设置文本的颜色和字体大小。同时还包含一个获取屏幕宽度的静态方法。其中，onCreate() 方法是在创建该 Activity 时调用的，它会设置...

public class MainActivity extends AppCompatActivity { private EditText searchEdit; private ImageButton searchBtn; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); searchEdit = findViewById(R.id.search_edit); searchBtn = findViewById(R.id.search_btn); searchBtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // 执行搜索操作 performSearch(); } }); // 设置软键盘的搜索按钮监听器 searchEdit.setOnEditorActionListener(new TextView.OnEditorActionListener() { @Override public boolean onEditorAction(TextView v, int actionId, KeyEvent event) { if (actionId == EditorInfo.IME_ACTION_SEARCH) { // 执行搜索操作 performSearch(); return true; } return false; } }); } private void performSearch() { String keyword = searchEdit.getText().toString().trim(); // 执行搜索操作，比如跳转到搜索结果页面 Intent intent = new Intent(this, SearchResultActivity.class); intent.putExtra("keyword", keyword); startActivity(intent); }}中actionId指的是什么

在这段代码中，actionId是指用户在软键盘上点击的动作（Action）的 ID，也就是指用户点击了软键盘上的哪个按钮。在这里，我们可以通过判断actionId是否等于 EditorInfo.IME_ACTION_SEARCH来判断用户是否点击了...

我需要你在下面的代码中加入一些功能，public class MainActivity extends AppCompatActivity { private EditText ipEditText; private EditText portEditText; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ipEditText = findViewById(R.id.ipEditText); portEditText = findViewById(R.id.portEditText); Button connectButton = findViewById(R.id.connectButton); connectButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { String ip = ipEditText.getText().toString(); int port = Integer.parseInt(portEditText.getText().toString()); try { Socket socket = new Socket(ip, port); BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream())); String message = in.readLine(); // 处理接收到的消息 } catch (IOException e) { e.printStackTrace(); } } }); }功能如下：在点击连接后，不会退出程序，主页面中有一个窗口可以事实监听显示端口下的消息

public class MainActivity extends AppCompatActivity { private EditText ipEditText; private EditText portEditText; private TextView messageTextView; private Socket socket; private BufferedReader ...

public class MainActivity extends AppCompatActivity { private EditText ipEditText; private EditText portEditText; private TextView messageTextView; private BufferedReader in; private PrintWriter out; private Socket socket; private Handler handler = new Handler(); @SuppressLint("MissingInflatedId") @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ipEditText = findViewById(R.id.ipEditText); portEditText = findViewById(R.id.portEditText); messageTextView = findViewById(R.id.messageTextView); Button connectButton = findViewById(R.id.connectButton); connectButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { String ip = ipEditText.getText().toString(); int port = Integer.parseInt(portEditText.getText().toString()); new Thread(new Runnable() { @Override public void run() { try { socket = new Socket(ip, port); in = new BufferedReader(new InputStreamReader(socket.getInputStream())); out = new PrintWriter(socket.getOutputStream(), true); // 在主页面中的窗口中实时显示消息 while (true) { String message = in.readLine(); if (message == null) { break; } handler.post(new Runnable() { @Override public void run() { messageTextView.append(message + "\n"); } }); } } catch (UnknownHostException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } }).start(); } }); Button sendMessageButton = findViewById(R.id.sendMessageButton); sendMessageButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { showSendMessageDialog(); } }); } @Override protected void onDestroy() { super.onDestroy(); try { if (in != null) { in.close(); } if (out != null) { out.close(); } if (socket != null) { socket.close(); } } catch (IOException e) { e.printStackTrace(); } } private void showSendMessageDialog() { AlertDialog.Builder builder = new AlertDialog.Builder(this); LayoutInflater inflater = getLayoutInflater(); View view = inflater.inflate(R.layout.dialog_send_message, null); final EditText messageEditText = view.findViewById(R.id.messageEditText); builder.setView(view) .setTitle("发送消息") .setPositiveButton("发送", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { String message = messageEditText.getText().toString(); if (out != null) { out.println(message); } } }) .setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.cancel(); } }) .create() .show(); } }能为我写出上面代码的布局文件吗

下面是该代码中使用到的布局文件： activity_main.xml： xml <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width=...

public class MainActivity extends AppCompatActivity { private TextView resultText; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); resultText = findViewById(R.id.result_text); findViewById(R.id.btn_0).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { appendText("0"); } }); findViewById(R.id.btn_1).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { appendText("1"); } }); // 添加其他数字按钮的 onClickListener findViewById(R.id.btn_add).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { appendText("+"); } }); findViewById(R.id.btn_subtract).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { appendText("-"); } }); // 添加其他运算符按钮的 onClickListener findViewById(R.id.btn_clear).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { clearText(); } }); findViewById(R.id.btn_equals).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { calculate(); } }); } private void appendText(String text) { resultText.append(text); } private void clearText() { resultText.setText(""); } private void calculate() { try { String expression = resultText.getText().toString(); Expression e = new ExpressionBuilder(expression).build(); double result = e.evaluate(); resultText.setText(Double.toString(result)); } catch (IllegalArgumentException ex) { resultText.setText("Error"); } }}

这是一个简单的计算器应用程序的主要代码。它使用了一个第三方库，即“expr-eval”，来解析算术表达式并计算结果。在 onCreate() 方法中，它设置了数字和运算符按钮的 onClickListener，并分别调用了 appendText()、...

import android.content.ComponentName; import android.content.Intent; import com.example.androidsy4.R; public class MainActivity extends AppCompatActivity implements View.OnClickListener { Button btnBindService, btnUnbindService, btnGetStatus; TextView tvServiceStatus; MyService.MyServiceBinder serviceBinder; boolean isServiceBind = false; ServiceConnection conn = new ServiceConnection(){ @Override public void onServiceConnected(ComponentName name, IBinder service) { } @Override public void onServiceDisconnected(componentName name){ } }; @Override protected void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); btnBindService=findViewById(R.id.btn_main_activity_bind_service); btnUnbindService=findViewById(R.id.btn_main_activity_unbind_service); btnGetStatus=findViewById(R.id.btn_main_activity_get_status); tvServiceStatus=findViewById(R.id.tv_main_activity_service_status); btnBindService.setOnClickListener(this); btnUnbindService.setOnClickListener(this); btnGetStatus.setOnClickListerner(this); } @Override public void onClick(view v){ Intent intent=new Intent(); intent.setClass(MainActivity.this,Myservice.class); switch (v.gerId()){ case R.id.btn_main_activity_bind_service: break; case R.id.btn_main_activity_get_status: break; case R.id.btn_main_activity_unbind_service: break; } } }补充所缺代码

补充的代码如下： @Override public void onClick(View v) { Intent intent = new Intent(); intent.setClass(MainActivity.this, MyService.class); switch (v.getId()) { case R.id.btn_main_activity_...

package com.example.ksswj; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.net.Socket; import java.net.UnknownHostException; public class MainActivity extends AppCompatActivity { private EditText ipEditText; private EditText portEditText; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ipEditText = findViewById(R.id.ipEditText); portEditText = findViewById(R.id.portEditText); Button connectButton = findViewById(R.id.connectButton); connectButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { String ip = ipEditText.getText().toString(); int port = Integer.parseInt(portEditText.getText().toString()); try { Socket socket = new Socket(ip, port); in = new BufferedReader(new InputStreamReader(socket.getInputStream())); // 在主页面中的窗口中实时显示消息 new Thread(new Runnable() { @Override public void run() { try { while (true) { String message = in.readLine(); if (message == null) { break; } runOnUiThread(new Runnable() { @Override public void run() { messageTextView.append(message + "\n"); } }); } } catch (IOException e) { e.printStackTrace(); } } }); } @Override protected void onDestroy() { super.onDestroy(); try { if (in != null) { in.close(); } if (socket != null) { socket.close(); } } catch (IOException e) { e.printStackTrace(); } } }这串代码有报错，能帮我修改好吗

public class MainActivity extends AppCompatActivity { private EditText ipEditText; private EditText portEditText; private TextView messageTextView; private BufferedReader in; private Socket ...

Android开发教程：基础UI编程——EditText与TextView

public class MainActivity extends Activity { EditText myEditText; TextView myTextView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); ...

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