如何解决java.lang。“illegalStateException”“StringIndexOutOfBound”“InvocationTargetException”

Question

有人可以帮我我写了这个程序，但它不起作用，我找不到解决方案。

1错误：由java.lang.IllegalStateException：无法执行活动的方法

第二个错误：由java.lang.StringIndexOutOfBoundException

第三错误：引起的java.lang.reflect .InvocationTargetException

package com.enkripsms; 

import com.dbutil.dbhelper; 
import android.app.Activity; 
import android.content.Intent; 
import android.database.sqlite.SQLiteDatabase; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.EditText; 
import android.widget.Toast; 

public class tulisPesan extends Activity { 
/** 
* @see android.app.Activity#onCreate(Bundle) 
*/ 
EditText pesan; 
EditText kunci; 
private SQLiteDatabase db = null; 
private dbhelper data = null; 

@Override 

protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    // TODO Put your code here 
    setContentView(R.layout.tulispesan); 
    data = new dbhelper(this); 
    db = data.getWritableDatabase(); 
    data.createTable(db);  
} 

public void sandikan (View s) { 
    kunci = (EditText)findViewById(R.id.kunci); 
    pesan = (EditText)findViewById(R.id.pesan); 
    String kuncinya = kunci.getText().toString(); 
    String plain = pesan.getText().toString(); 
    String chiper = ""; 

    if (kuncinya.isEmpty()) { //(kunci == null) 
     Toast.makeText(this, "Maaf, kunci harus diisi", Toast.LENGTH_LONG).show(); 
    }else{ 
     String acak = ""; 
     double acakN; 
     for (int a = 0; a<kuncinya.length(); a++) { 
      acakN = Math.random() * 25 + 65; 
      acak = acak + (char) acakN; 
     } 
     kunci.setText(acak); 
    } 

    if (kuncinya.length() != plain.length()) { 
     for (int a = 0; a<plain.length(); a++) { 
      String tambahk = ""; 
      tambahk = tambahk + kuncinya.substring(0, 1); 
      kuncinya = tambahk; 
     } 
     kunci.setText(kuncinya); 
    } 

    for (int a = 0; a<plain.length(); a++) { 
     String plainBin = "0" + Integer.toBinaryString((int)plain.charAt(a)); 

     if (plainBin.length() < 8) 
      plainBin = "0" + plainBin; 

     String keyBin = "0" + Integer.toBinaryString((int)kuncinya.charAt(a)); 

     for (int b = 0; b<8; b++) { 
      chiper = chiper + Integer.toString((Integer.parseInt(plainBin.substring(b, b+1)))^Integer.parseInt(keyBin.substring(b, b+1))); 
     }  
    } 
    Intent hasilPesan = new Intent(); 
    hasilPesan.setClass(this, hasilPesan.class); 
    hasilPesan.putExtra("chiper", chiper); 
    startActivity(hasilPesan); 
} 

public void inputData() { 

} 

public void kembali (View k) { 
    Intent kembali = new Intent(); 
    kembali.setClass(this, MainActivity.class); 
    startActivity(kembali); 
} 


} 

这是我完整的错误

03-06 22:39:59.964: E/AndroidRuntime(330): FATAL EXCEPTION: main 
03-06 22:39:59.964: E/AndroidRuntime(330): java.lang.IllegalStateException: Could not execute method of the activity 
03-06 22:39:59.964: E/AndroidRuntime(330): at android.view.View$1.onClick(View.java:2144) 
03-06 22:39:59.964: E/AndroidRuntime(330): at android.view.View.performClick(View.java:2485) 
03-06 22:39:59.964: E/AndroidRuntime(330): at android.view.View$PerformClick.run(View.java:9080) 
03-06 22:39:59.964: E/AndroidRuntime(330): at android.os.Handler.handleCallback(Handler.java:587) 
03-06 22:39:59.964: E/AndroidRuntime(330): at android.os.Handler.dispatchMessage(Handler.java:92) 
03-06 22:39:59.964: E/AndroidRuntime(330): at android.os.Looper.loop(Looper.java:123) 
03-06 22:39:59.964: E/AndroidRuntime(330): at android.app.ActivityThread.main(ActivityThread.java:3683) 
03-06 22:39:59.964: E/AndroidRuntime(330): at java.lang.reflect.Method.invokeNative(Native Method) 
03-06 22:39:59.964: E/AndroidRuntime(330): at java.lang.reflect.Method.invoke(Method.java:507) 
03-06 22:39:59.964: E/AndroidRuntime(330): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
03-06 22:39:59.964: E/AndroidRuntime(330): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
03-06 22:39:59.964: E/AndroidRuntime(330): at dalvik.system.NativeStart.main(Native Method) 
03-06 22:39:59.964: E/AndroidRuntime(330): Caused by: java.lang.reflect.InvocationTargetException 
03-06 22:39:59.964: E/AndroidRuntime(330): at java.lang.reflect.Method.invokeNative(Native Method) 
03-06 22:39:59.964: E/AndroidRuntime(330): at java.lang.reflect.Method.invoke(Method.java:507) 
03-06 22:39:59.964: E/AndroidRuntime(330): at android.view.View$1.onClick(View.java:2139) 
03-06 22:39:59.964: E/AndroidRuntime(330): ... 11 more 
03-06 22:39:59.964: E/AndroidRuntime(330): Caused by: java.lang.StringIndexOutOfBoundsException 
03-06 22:39:59.964: E/AndroidRuntime(330): at com.enkripsms.tulisPesan.sandikan(tulisPesan.java:66) 
03-06 22:39:59.964: E/AndroidRuntime(330): ... 14 more 

有人请帮助我，谢谢你..

Answer 1

在for循环

：

chiper = chiper + Integer.toString((Integer.parseInt(plainBin.substring(b, b+1)))^Integer.parseInt(keyBin.substring(b, b+1))); 

超过字符串的长度。

所以看这条线，并检查要被循环8次

for (int b = 0; b<8; b++) { 

记得。你说来看看B + 1当你设置chiper， 所以你的问题的原因是当你在你的循环中的某个点击中b + 1时没有任何价值（最有可能是最后一个循环）