Android SDK (Kindle Fire) - Button onClick() not firing

Question

我对Java和Android SDK都很陌生，所以如果这个问题很愚蠢，我很抱歉。我正在写一个应用程序，应该显示一个简单的按钮，并在点击时发送消息到本地服务器。然而，当我点击按钮时，什么也没发生。下面是我的代码:

. java

package com.example.hellokindlefire;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.Socket;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class HelloKindleFireActivity extends Activity implements OnClickListener {
    private Socket socket;
    private PrintWriter pw;
    private Button button;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_hello_kindle_fire);
        button = (Button)findViewById(R.id.send_button);
        button.setOnClickListener(this);
    }
    public void onClick(View v) {
        sendSignal(v);
    }
    public void sendSignal(View v) {
        System.out.println("Sending...");
        try {
            socket = new Socket("192.168.1.100", 63400);
            pw = new PrintWriter(socket.getOutputStream(), true);
            pw.println("Hello!");
        } catch(IOException e) {
            System.out.println(e);
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.hello_kindle_fire, menu);
        return true;
    }
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

. xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.hellokindlefire.HelloKindleFireActivity" >

    <Button
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:text="@string/signal"
        android:id="@+id/send_button" />
</RelativeLayout>

我看了所有的按钮文档，也看了这里类似的问题，但似乎没有工作。我已经确保在一个单独的程序中测试sendSignal内部的代码，并且消息被服务器接收，没有问题。

Answer 1

你需要使用on click的@override方法，在此之间你需要找到你的按钮的id。

public class HelloKindleFireActivity extends Activity implements
    OnClickListener {
  private Socket socket;
  private PrintWriter pw;
  private Button button;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    button = (Button) findViewById(R.id.send_button);
    button.setOnClickListener(this);
  }
  public void sendSignal(View v) {
    System.out.println("Sending...");
    try {
        socket = new Socket("192.168.1.100", 63400);
        pw = new PrintWriter(socket.getOutputStream(), true);
        pw.println("Hello!");
    } catch (IOException e) {
        System.out.println(e);
    }
  }
  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
  }
  @Override
  public void onClick(View v) {
    // TODO Auto-generated method stub
    if (v.getId() == R.id.send_button) {
        sendSignal(v);
    }
  }
}