android：点击按钮后应用程序崩溃

问题描述：

你好我是新来的android应用程序开发和Java。我使用了一些来自互联网的代码和Android工作室生成的代码。它需要发送一个字符串通过套接字到wifi屏蔽以控制一艘载有货物的小船。当我调试我的应用程序时，它开始，但是当我点击任何按钮时，它会崩溃。我试图使用logcat来查找问题，但它没有显示任何东西。我使用了一些在stackoverflow中找到的错误范围，并在设备上设置。当我尝试seekBar应用程序不会崩溃，点击后不会显示吐司。android：点击按钮后应用程序崩溃

我的代码运行检查后，我发现这一点：

“公共”方法buttonConnectOnClickListener（）通过接口69行

没有暴露它表明我对每一个同样的问题按钮监听器，我不知道如何解决它。

这里是Main.java：

package tomasbenco.kop_android_controller; 

    import android.app.Activity; 
    import android.content.Context; 
    import android.net.ConnectivityManager; 
    import android.net.NetworkInfo; 
    import android.os.Bundle; 
    import android.view.View; 
    import android.widget.Button; 
    import android.widget.SeekBar; 
    import android.widget.Switch; 
    import android.widget.Toast; 

    import java.io.DataOutputStream; 
    import java.io.IOException; 
    import java.net.Socket; 
    import java.net.UnknownHostException; 

    public class Main extends Activity { 
     private Button C1Button = null; 
     private Button C2Button = null; 
     private Switch lightsSwitch = null; 
     private SeekBar RESB = null; 
     private SeekBar LESB = null; 
     private Boolean connected = Boolean.FALSE; 
     private DataOutputStream dataOutputStream = null; 
     private Socket socket = null; 
     private char[] transferReg = new char[7]; 

    private void setTransferReg(char transferReg, int i) { 
     this.transferReg[i] = transferReg; 
    } 

    private char[] getTransferReg() { 
     return transferReg; 
    } 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     C1Button = (Button) findViewById(R.id.C1Button); 
     C2Button = (Button) findViewById(R.id.C2Button); 
     lightsSwitch = (Switch) findViewById(R.id.LightsSwitch); 
     RESB = (SeekBar) findViewById(R.id.REseekBar); 
     LESB = (SeekBar) findViewById(R.id.LEseekBar); 
    } 

    private void changeConnectionStatus(Boolean isConnected) { 
     connected = isConnected; 
     if (isConnected) { 
      C1Button.setVisibility(View.VISIBLE); 
      C2Button.setVisibility(View.VISIBLE); 
      lightsSwitch.setVisibility(View.VISIBLE); 
      RESB.setVisibility(View.VISIBLE); 
      LESB.setVisibility(View.VISIBLE); 
     } else { 
      C1Button.setVisibility(View.INVISIBLE); 
      C2Button.setVisibility(View.INVISIBLE); 
      lightsSwitch.setVisibility(View.INVISIBLE); 
      RESB.setVisibility(View.INVISIBLE); 
      LESB.setVisibility(View.INVISIBLE); 
     } 
    } 


    public void buttonConnectOnClickListener(View view) { 
     ConnectivityManager connectivity = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); 
     NetworkInfo wifiInfo = connectivity.getNetworkInfo(ConnectivityManager.TYPE_WIFI); 
     if (wifiInfo.isConnected()) { 
      if (!connected) { 
       try { 
        socket = new Socket("192.168.137.1", 55555); 
        Toast msg = Toast.makeText(Main.this, 
          "Connected Successfully", Toast.LENGTH_LONG); 
        msg.show(); 
        dataOutputStream = new DataOutputStream(socket.getOutputStream()); 
        changeConnectionStatus(Boolean.TRUE); 
       } catch (IOException e) { 
        changeConnectionStatus(Boolean.FALSE); 
       } 
      } else { 
       try { 
        socket.close(); 
        Toast msg = Toast.makeText(Main.this, "Disconnected Successfully", Toast.LENGTH_LONG); 
        msg.show(); 
        changeConnectionStatus(Boolean.FALSE); 
       } catch (UnknownHostException e) { 
        changeConnectionStatus(Boolean.FALSE); 
       } catch (IOException e) { 
        changeConnectionStatus(Boolean.FALSE); 
       } 
      } 
     } else { 
      Toast msg = Toast.makeText(Main.this, "Wifi is not connected !", Toast.LENGTH_LONG); 
      msg.show(); 
     } 
    } 


    public void C1ButtonOnClickListener(View view) { 
     if (C1Button.isActivated()) { 
      Toast msg = Toast.makeText(Main.this, "Front cargo bay is opening !", Toast.LENGTH_LONG); 
      msg.show(); 
      transfer_REG(4, '1'); 
     } else { 
      Toast msg = Toast.makeText(Main.this, "Front cargo bay is closing !", Toast.LENGTH_LONG); 
      msg.show(); 
      transfer_REG(4, '0'); 
     } 
    } 

    public void C2ButtonOnClickListener(View view) { 
     if (C2Button.isActivated()) { 
      Toast msg = Toast.makeText(Main.this, "Back cargo bay is opening !", Toast.LENGTH_LONG); 
      msg.show(); 
      transfer_REG(5, '1'); 
     } else { 
      Toast msg = Toast.makeText(Main.this, "Back cargo bay is closing !", Toast.LENGTH_LONG); 
      msg.show(); 
      transfer_REG(5, '0'); 
     } 
    } 

    public void lightsButtonOnClickListener(View view) { 
     if (C2Button.isActivated()) { 
      Toast msg = Toast.makeText(Main.this, "Back cargo bay is opening !", Toast.LENGTH_LONG); 
      msg.show(); 
      transfer_REG(6, '1'); 
     } else { 
      Toast msg = Toast.makeText(Main.this, "Back cargo bay is closing !", Toast.LENGTH_LONG); 
      msg.show(); 
      transfer_REG(6, '0'); 
     } 
    } 

    private void transfer_REG(int i, char trans) { 
     setTransferReg(trans, i); 
     String transfer = new String(getTransferReg()); 
     if (connected) try { 
      dataOutputStream.writeChars(transfer); 
     } catch (IOException ignored) { 
     } 
    } 

    public void REListener(View view) { 
     if (RESB.getProgress() < 10) { 
      transfer_REG(2, Integer.toString(RESB.getProgress()).charAt(0)); 
      transfer_REG(3, '1'); 
     } else { 
      transfer_REG(2, Integer.toString(RESB.getProgress() - 10).charAt(0)); 
      transfer_REG(3, '0'); 
     } 
    } 

    public void LEListener(View view) { 
     if (LESB.getProgress() < 10) { 
      transfer_REG(1, Integer.toString(LESB.getProgress()).charAt(0)); 
      transfer_REG(2, '1'); 
      Toast msg = Toast.makeText(Main.this, "Left engine power is: -" + Integer.toString(LESB.getProgress()).charAt(0), Toast.LENGTH_LONG); 
      msg.show(); 
     } else { 
      transfer_REG(1, Integer.toString(LESB.getProgress() - 10).charAt(0)); 
      transfer_REG(2, '0'); 
      Toast msg = Toast.makeText(Main.this, "Left engine power is: " + Integer.toString(LESB.getProgress() - 10).charAt(0), Toast.LENGTH_LONG); 
      msg.show(); 
     } 
    } 
}

下面是main.xml中：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
style="@android:style/Theme.Holo" 
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=".Main"> 

<TextView 
    android:id="@+id/REtView" 
    style="@android:style/Theme.Holo" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_above="@+id/REseekBar" 
    android:layout_alignParentEnd="true" 
    android:text="@string/RE" 
    android:textAppearance="?android:attr/textAppearanceLarge" 
    android:textColor="#ffaec0ff" 
    android:textStyle="bold|italic" 
    android:theme="@style/Holo" 
    android:visibility="visible" /> 

<TextView 
    android:id="@+id/LEtView" 
    style="@android:style/Theme.Holo" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_above="@+id/LEseekBar" 
    android:layout_alignParentStart="true" 
    android:text="@string/LE" 
    android:textAppearance="?android:attr/textAppearanceLarge" 
    android:textColor="#ffaec0ff" 
    android:textStyle="bold|italic" 
    android:theme="@style/Holo" 
    android:visibility="visible" /> 

<SeekBar 
    android:id="@+id/LEseekBar" 
    style="@android:style/Theme.Holo" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentBottom="true" 
    android:layout_alignParentStart="true" 
    android:layout_toStartOf="@+id/LightsSwitch" 
    android:clickable="true" 
    android:max="20" 
    android:onClick="LEListener" 
    android:progress="10" 
    android:theme="@style/Holo" 
    android:visibility="visible" /> 

<SeekBar 
    android:id="@+id/REseekBar" 
    style="@android:style/Theme.Holo" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignEnd="@+id/REtView" 
    android:layout_alignParentBottom="true" 
    android:layout_toEndOf="@+id/LightsSwitch" 
    android:clickable="true" 
    android:max="20" 
    android:onClick="REListener" 
    android:progress="10" 
    android:theme="@style/Holo" 
    android:visibility="visible" /> 

<Button 
    android:id="@+id/connButton" 
    style="@android:style/Theme.Holo" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentTop="true" 
    android:layout_centerHorizontal="true" 
    android:clickable="true" 
    android:onClick="buttonConnectOnClickListener" 
    android:text="@string/conn" 
    android:textColor="#ffaec0ff" 
    android:textStyle="normal" 
    android:theme="@style/Holo" 
    android:typeface="normal" 
    android:visibility="visible" /> 

<Button 
    android:id="@+id/C1Button" 
    style="@android:style/Theme.Holo" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_centerHorizontal="true" 
    android:layout_centerVertical="true" 
    android:clickable="true" 
    android:onClick="C1ButtonOnClickListener" 
    android:text="@string/C1" 
    android:textColor="#ffaec0ff" 
    android:textStyle="normal" 
    android:theme="@style/Holo" 
    android:visibility="visible" /> 

<Button 
    android:id="@+id/C2Button" 
    style="@android:style/Theme.Holo" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@+id/C1Button" 
    android:layout_centerHorizontal="true" 
    android:clickable="true" 
    android:onClick="C2ButtonOnClickListener" 
    android:text="@string/C2" 
    android:textColor="#ffaec0ff" 
    android:textStyle="normal" 
    android:theme="@style/Holo" 
    android:visibility="visible" /> 

<Switch 
    android:id="@+id/LightsSwitch" 
    style="@android:style/Theme.Holo" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@+id/C2Button" 
    android:layout_centerHorizontal="true" 
    android:checked="true" 
    android:clickable="true" 
    android:onClick="lightsButtonOnClickListener" 
    android:showText="false" 
    android:singleLine="true" 
    android:text="@string/light" 
    android:textColor="#ffaec0ff" 
    android:textStyle="normal" 
    android:theme="@style/Holo" 
    android:visibility="visible" />

这里的manifest.xml：

<?xml version="1.0" encoding="utf-8"?>

<uses-permission android:name="android.permission.INTERNET" /> 
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> 

<application 
    android:allowBackup="true" 
    android:icon="@mipmap/ic_launcher" 
    android:label="@string/app_name" 
    android:theme="@android:style/Theme.Holo"> 
    <activity 
     android:name=".Main" 
     android:configChanges="keyboard|keyboardHidden" 
     android:label="@string/app_name"> 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 

      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity> 
</application>

发布堆栈跟踪 – Shriram

请使用'boolean'的原始版本。另外，确保遵循Java代码风格约定。 – Emmanuel

我没有在您的代码段中找到任何听众的注册码！ – Shriram

答

尝试下面的代码，

申报按钮全局像两个按钮的其余部分;

private Button connButton;

把这个代码，您声明所有的IDS。

connButton = (Button) findViewById(R.id.connButton);

答

你可以在你的android清单中看到你是否有这个权限？

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

我试图复制你的代码并执行，这是我用顶部按钮得到的问题。一旦这在Android清单中添加，那么问题就解决了。

由于您没有发布AndroidManifest.xml，因此很难说您可能在那里声明了哪个权限。那么你可以检查一下是否已经存在，如果不存在，你可以添加并尝试吗？

我希望这会有所帮助。

感谢您的帮助，但我从开始就有它，我也添加了清单 –

您可以粘贴您的logcat错误吗？你的代码在一些定制后以某种方式与我一起工作。就像我删除了style属性让它运行。如果粘贴会正确显示错误的堆栈跟踪。 –

android：点击按钮后应用程序崩溃

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