Question

我正在创建一个Android应用程序。编译得很好，eclipse没有发现任何错误。但是当我运行它时，我会在堆栈跟踪中得到它。

<disconnected>DalvikVM[localhost:8639]

这是我的代码：

package com.warhammerdicerrolleralpha;


import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;

public class myMain extends Activity 
{

    EditText enternumberofdice;

    TextView textGenerateNumber;

    int number1;

    int number2;

    ImageView i;

    private EditText text, text2, text3;

    private Button btutorial1;

    private int myFaceValue;

    int myNum;

    /**
     * Called when the activity is first created.
     * 
     * @return
     */
    @Override

    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        textGenerateNumber = (TextView) findViewById(R.id.text4);

        number1 = Integer.parseInt(text.getText().toString());

        number2 = Integer.parseInt(text2.getText().toString());

        ImageView i = new ImageView(this);

        i.setAdjustViewBounds(true);

    }

    public void go() 
    {
        while (myNum > 0) 
        {

            textGenerateNumber.setText(String.valueOf(enternumberofdice));

             --myNum;

            return;
        }
    }

    public int roll() 
    {
        int val = (int) (6 * Math.random() + 1); // Range 1-6
        setValue(val);
        return val;
    }

    {
        try 
        {
            myNum = Integer.parseInt(enternumberofdice.getText().toString());
        } 
            catch (NumberFormatException nfe) 
        {
            enternumberofdice.setText("Does not work");
        }
    }

    public int getValue() 
    {
        return myFaceValue;
    }

    public void setValue(int myFaceValue) 
    {
        this.myFaceValue = myFaceValue;

    }

    {
        switch (myFaceValue) 
        {
        case 5:
            i.setImageResource(R.drawable.dicefive);
            break;
        case 1:
            i.setImageResource(R.drawable.diceone);
            break;
        case 3:
            i.setImageResource(R.drawable.dicethree);
            break;
        case 2:
            i.setImageResource(R.drawable.dicetwo);
            break;
        case 4:
            i.setImageResource(R.drawable.dicefour);
            break;
        case 6:
            i.setImageResource(R.drawable.dicesix);
            break;
        default:
            i.setImageResource(R.drawable.error);
            break;
        }

        text = (EditText) findViewById(R.id.editText1);

        text2 =(EditText) findViewById(R.id.editText2);

        text3 = (EditText) findViewById(R.id.editText3);  

        btutorial1 = (Button) findViewById(R.id.button1);

        btutorial1.setOnClickListener((OnClickListener) this);

        Button buttonGenerate = (Button) findViewById(R.id.button1);

        enternumberofdice = (EditText) findViewById(R.id.enternumberofdice);

        Button buttonGenerate2 = (Button) findViewById(R.id.battlecalculate);

        buttonGenerate2.setOnClickListener(new OnClickListener()    
        {

            @Override
            public void onClick(View v) 
            {
                    setContentView(R.layout.main2);
            }

        });

        buttonGenerate.setOnClickListener(new OnClickListener()     
        {
            @Override
            public void onClick(View v) 
            {
                // TODO Auto-generated method stub
                go();

                roll();
            }

        });
    }

    public void onClick(View view) 
    {
        switch (view.getId()) 
        {
            case R.id.button1:

                if (number1 > number2) 
                {
                    text3.setText("Three and above");       
                    return;
                }

                else if (number1 < number2) 
                {
                    text3.setText("Five and above");        
                    return;
                }

                else if (number1 == number2) 
                {
                    text3.setText("Four and above");        
                    return;
                }

                else
                {
                    text3.setText("Not Working");       
                    return;
                }

        }
    }
}

P.S。如何在帖子中添加xml代码。当我将xml代码添加到我的帖子时，它不会出现在预览页面中。

这是我的堆栈跟踪。

DalvikVM [本地主机：8695]
    线程[＆lt; 1＆gt; main]（Suspended（例外RuntimeException））
        ActivityThread.performLaunchActivity（ActivityThread $ ActivityRecord，Intent）行：2585
        ActivityThread.handleLaunchActivity（ActivityThread $ ActivityRecord，Intent）行：2679
        ActivityThread.access $ 2300（ActivityThread，ActivityThread $ ActivityRecord，Intent）行：125         ActivityThread $ H.handleMessage（消息）行：2033
        ActivityThread $ H（Handler）.dispatchMessage（Message）行：99         Looper.loop（）行：123         ActivityThread.main（String []）行：4627
        Method.invokeNative（Object，Object []，Class，Class []，Class，int，boolean）line：not available [native method]
        Method.invoke（Object，Object ...）行：521
        ZygoteInit $ MethodAndArgsCaller.run（）行：868
        ZygoteInit.main（String []）行：626         NativeStart.main（String []）行：不可用[native method]
    线程[＆lt; 6＆gt; Binder Thread＃2]（正在运行）     线程[＆lt; 5＆gt; Binder Thread＃1]（正在运行）

Answer 1

你做的类级变量初始化，例如textGenerateNumber，必须在调用setContentView方法中的onCreate之后完成。

更新：重构代码应该是这样的。但是，number1和number2分配没有意义，因为您尚未初始化text和text2变量。

.... EditText enternumberofdice; TextView textGenerateNumber; private EditText text, text2, text3; private Button btutorial1; int number1; int number2; ImageView i; private int myFaceValue; int myNum; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); textGenerateNumber = (TextView) findViewById(R.id.text4); //BUG: will fail since text/text2 isn't initialized //number1 = Integer.parseInt(text.getText().toString()); //number2 = Integer.parseInt(text2.getText().toString()); i = new ImageView(this); i.setAdjustViewBounds(true); }

Answer 2

final TextView textGenerateNumber = (TextView) findViewById(R.id.text4);

在onCreate方法之前运行，因此您的观点尚未存在。在致电setContentView()后，添加所有代码以检索视图。

我的Android应用程序意外关闭。 Eclipse说它无法连接到本地主机

2 个答案: