Java 在使用AES加密从数据库读取数据并在listview中列出时，线程以未捕获异常（组=0x40a3b1f8）退出？

我成功地使用AES加密字符串并保存到数据库中。现在，当应用程序启动时，它会读取listview上的数据库和列表。由于字符串是加密的，所以在显示在listview中之前必须对其进行解密。我编写了代码，看起来还可以，但每次启动时我的应用程序都会崩溃

AESHelper.java

package protect.my.password;

import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

import android.app.Activity;

public class AESHelper extends Activity{

       public static String encrypt(String seed, String cleartext) throws Exception {
               byte[] rawKey = getRawKey(seed.getBytes());
               byte[] result = encrypt(rawKey, cleartext.getBytes());
               return toHex(result);
       }

       public static String decrypt(String seed, String encrypted) throws Exception {
               byte[] rawKey = getRawKey(seed.getBytes());
               byte[] enc = toByte(encrypted);
               byte[] result = decrypt(rawKey, enc);
               return new String(result);
       }

       private static byte[] getRawKey(byte[] seed) throws Exception {
               KeyGenerator kgen = KeyGenerator.getInstance("AES");
               SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
               sr.setSeed(seed);
           kgen.init(128, sr); // 192 and 256 bits may not be available
           SecretKey skey = kgen.generateKey();
           byte[] raw = skey.getEncoded();
           return raw;
       }


       private static byte[] encrypt(byte[] raw, byte[] clear) throws Exception {
           SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
               Cipher cipher = Cipher.getInstance("AES");
           cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
           byte[] encrypted = cipher.doFinal(clear);
               return encrypted;
       }

       private static byte[] decrypt(byte[] raw, byte[] encrypted) throws Exception {
           SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
               Cipher cipher = Cipher.getInstance("AES");
           cipher.init(Cipher.DECRYPT_MODE, skeySpec);
           byte[] decrypted = cipher.doFinal(encrypted);
               return decrypted;
       }

       public static String toHex(String txt) {
               return toHex(txt.getBytes());
       }
       public static String fromHex(String hex) {
               return new String(toByte(hex));
       }

       public static byte[] toByte(String hexString) {
               int len = hexString.length()/2;
               byte[] result = new byte[len];
               for (int i = 0; i < len; i++)
                       result[i] = Integer.valueOf(hexString.substring(2*i, 2*i+2), 16).byteValue();
               return result;
       }

       public static String toHex(byte[] buf) {
               if (buf == null)
                       return "";
               StringBuffer result = new StringBuffer(2*buf.length);
               for (int i = 0; i < buf.length; i++) {
                       appendHex(result, buf[i]);
               }
               return result.toString();
       }
       private final static String HEX = "0123456789ABCDEF";
       private static void appendHex(StringBuffer sb, byte b) {
               sb.append(HEX.charAt((b>>4)&0x0f)).append(HEX.charAt(b&0x0f));
       }


}

package protect.my.password;

import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;


/**
 * Demo application to show how to use the 
 * built-in SQLite database with a cursor to populate
 * a ListView.
 */
public class ListView_read extends Activity {
    int[] imageIDs = {R.drawable.lock};
    int nextImageIndex = 0;
    String seedValue = "This Is MySecure";
    String diwas=DBAdapter.KEY_WEBSITE;
    String Website_decrypt;
    DBAdapter myDb;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.listview_read);

        openDB();
        populateListViewFromDB();
        registerListClickCallback();
    }
    @Override
    protected void onDestroy() {
        super.onDestroy();  
        closeDB();
    }

    private void openDB() {
        myDb = new DBAdapter(this);
        myDb.open();
    }
    private void closeDB() {
        myDb.close();
    }

    private void populateListViewFromDB() {
        Cursor cursor = myDb.getAllRows();

        // Allow activity to manage lifetime of the cursor.
        // DEPRECATED! Runs on the UI thread, OK for small/short queries.
        startManagingCursor(cursor);

        diwas();
        // Setup mapping from cursor to view fields:
        String[] fromFieldNames = new String[] {Website_decrypt, DBAdapter.KEY_STUDENTNUM};
        int[] toViewIDs = new int[] {R.id.item_name,     R.id.item_icon};

        // Create adapter to may columns of the DB onto elementt in the UI.



        SimpleCursorAdapter myCursorAdapter = 
                new SimpleCursorAdapter(
                        this,       // Context
                        R.layout.item_layout,   // Row layout template
                        cursor,                 // cursor (set of DB records to map)
                        fromFieldNames,         // DB Column names
                        toViewIDs, // View IDs to put information in
                        1
                        );

        // Set the adapter for the list view
        ListView myList = (ListView) findViewById(R.id.listViewFromDB);
        myList.setAdapter(myCursorAdapter);
    }

    private void diwas() {
        // TODO Auto-generated method stub

            try {
                Website_decrypt = AESHelper.decrypt(seedValue, diwas);
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }


    }
}

知道我的应用程序为什么会崩溃吗

Logcat

08-05 08:49:11.425: D/dalvikvm(2363): GC_FOR_ALLOC freed 76K, 5% free 3135K/3276K, paused 31ms, total 34ms
08-05 08:49:11.475: W/System.err(2363): java.lang.NumberFormatException: Invalid int: "we"
08-05 08:49:11.485: W/System.err(2363):     at java.lang.Integer.invalidInt(Integer.java:137)
08-05 08:49:11.485: W/System.err(2363):     at java.lang.Integer.parse(Integer.java:374)
08-05 08:49:11.485: W/System.err(2363):     at java.lang.Integer.parseInt(Integer.java:365)
08-05 08:49:11.495: W/System.err(2363):     at java.lang.Integer.valueOf(Integer.java:509)
08-05 08:49:11.495: W/System.err(2363):     at protect.my.password.AESHelper.toByte(AESHelper.java:72)
08-05 08:49:11.495: W/System.err(2363):     at protect.my.password.AESHelper.decrypt(AESHelper.java:29)
08-05 08:49:11.495: W/System.err(2363):     at protect.my.password.ListView_read.diwas(ListView_read.java:87)
08-05 08:49:11.495: W/System.err(2363):     at protect.my.password.ListView_read.populateListViewFromDB(ListView_read.java:59)
08-05 08:49:11.505: W/System.err(2363):     at protect.my.password.ListView_read.onCreate(ListView_read.java:35)
08-05 08:49:11.505: W/System.err(2363):     at android.app.Activity.performCreate(Activity.java:5231)
08-05 08:49:11.505: W/System.err(2363):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
08-05 08:49:11.505: W/System.err(2363):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
08-05 08:49:11.505: W/System.err(2363):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
08-05 08:49:11.505: W/System.err(2363):     at android.app.ActivityThread.access$800(ActivityThread.java:135)
08-05 08:49:11.505: W/System.err(2363):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
08-05 08:49:11.505: W/System.err(2363):     at android.os.Handler.dispatchMessage(Handler.java:102)
08-05 08:49:11.505: W/System.err(2363):     at android.os.Looper.loop(Looper.java:136)
08-05 08:49:11.505: W/System.err(2363):     at android.app.ActivityThread.main(ActivityThread.java:5017)
08-05 08:49:11.505: W/System.err(2363):     at java.lang.reflect.Method.invokeNative(Native Method)
08-05 08:49:11.505: W/System.err(2363):     at java.lang.reflect.Method.invoke(Method.java:515)
08-05 08:49:11.505: W/System.err(2363):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
08-05 08:49:11.505: W/System.err(2363):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
08-05 08:49:11.505: W/System.err(2363):     at dalvik.system.NativeStart.main(Native Method)
08-05 08:49:11.515: D/AndroidRuntime(2363): Shutting down VM
08-05 08:49:11.515: W/dalvikvm(2363): threadid=1: thread exiting with uncaught exception (group=0xb4aa9ba8)
08-05 08:49:11.535: E/AndroidRuntime(2363): FATAL EXCEPTION: main
08-05 08:49:11.535: E/AndroidRuntime(2363): Process: protect.my.password, PID: 2363
08-05 08:49:11.535: E/AndroidRuntime(2363): java.lang.RuntimeException: Unable to start activity ComponentInfo{protect.my.password/protect.my.password.ListView_read}: java.lang.NullPointerException
08-05 08:49:11.535: E/AndroidRuntime(2363):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
08-05 08:49:11.535: E/AndroidRuntime(2363):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
08-05 08:49:11.535: E/AndroidRuntime(2363):     at android.app.ActivityThread.access$800(ActivityThread.java:135)
08-05 08:49:11.535: E/AndroidRuntime(2363):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
08-05 08:49:11.535: E/AndroidRuntime(2363):     at android.os.Handler.dispatchMessage(Handler.java:102)
08-05 08:49:11.535: E/AndroidRuntime(2363):     at android.os.Looper.loop(Looper.java:136)
08-05 08:49:11.535: E/AndroidRuntime(2363):     at android.app.ActivityThread.main(ActivityThread.java:5017)
08-05 08:49:11.535: E/AndroidRuntime(2363):     at java.lang.reflect.Method.invokeNative(Native Method)
08-05 08:49:11.535: E/AndroidRuntime(2363):     at java.lang.reflect.Method.invoke(Method.java:515)
08-05 08:49:11.535: E/AndroidRuntime(2363):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
08-05 08:49:11.535: E/AndroidRuntime(2363):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
08-05 08:49:11.535: E/AndroidRuntime(2363):     at dalvik.system.NativeStart.main(Native Method)
08-05 08:49:11.535: E/AndroidRuntime(2363): Caused by: java.lang.NullPointerException
08-05 08:49:11.535: E/AndroidRuntime(2363):     at android.database.sqlite.SQLiteCursor.getColumnIndex(SQLiteCursor.java:178)
08-05 08:49:11.535: E/AndroidRuntime(2363):     at android.database.AbstractCursor.getColumnIndexOrThrow(AbstractCursor.java:301)
08-05 08:49:11.535: E/AndroidRuntime(2363):     at android.widget.SimpleCursorAdapter.findColumns(SimpleCursorAdapter.java:333)
08-05 08:49:11.535: E/AndroidRuntime(2363):     at android.widget.SimpleCursorAdapter.<init>(SimpleCursorAdapter.java:107)
08-05 08:49:11.535: E/AndroidRuntime(2363):     at protect.my.password.ListView_read.populateListViewFromDB(ListView_read.java:69)
08-05 08:49:11.535: E/AndroidRuntime(2363):     at protect.my.password.ListView_read.onCreate(ListView_read.java:35)
08-05 08:49:11.535: E/AndroidRuntime(2363):     at android.app.Activity.performCreate(Activity.java:5231)
08-05 08:49:11.535: E/AndroidRuntime(2363):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)

08-05 08:49:11.425:D/dalvikvm（2363）：全部释放76K，5%释放3135K/3276K，暂停31ms，总计34ms
08-05 08:49:11.475:W/System.err（2363）：java.lang.NumberFormatException:无效int:“我们”
08-05 08:49:11.485:W/System.err（2363）：位于java.lang.Integer.invalidit（Integer.java:137）
08-05 08:49:11.485:W/System.err（2363）：at java.lang.Integer.parse（Integer.java:374）
08-05 08:49:11.485:W/System.err（2363）：位于java.lang.Integer.parseInt（Integer.java:365）
08-05 08:49:11.495:W/System.err（2363）：at java.lang.Integer.valueOf（Integer.java:509）
08-05 08:49:11.495:W/System.err（2363）：at-protect.my.password.AESHelper.toByte（AESHelper.java:72）
08-05 08:49:11.495:W/System.err（2363）：at-protect.my.password.AESHelper.decrypt（AESHelper.java:29）
08-05 08:49:11.495:W/System.err（2363）：at-protect.my.password.ListView\u-read.diwas（ListView\u-read.java:87）
08-05 08:49:11.495:W/System.err（2363）：at protect.my.password.ListView\u read.populateListViewFromDB（ListView\u read.java:59）
08-05 08:49:11.505:W/System.err（2363）：at protect.my.password.ListView\u read.onCreate（ListView\u read.java:35）
08-05 08:49:11.505:W/System.err（2363）：位于android.app.Activity.performCreate（Activity.java:5231）
08-05 08:49:11.505:W/System.err（2363）：位于android.app.Instrumentation.callActivityOnCreate（Instrumentation.java:1087）
08-05 08:49:11.505:W/System.err（2363）：在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2159）
08-05 08:49:11.505:W/System.err（2363）：位于android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2245）
08-05 08:49:11.505:W/System.err（2363）：在android.app.ActivityThread.access$800（ActivityThread.java:135）
08-05 08:49:11.505:W/System.err（2363）：位于android.app.ActivityThread$H.handleMessage（ActivityThread.java:1196）
08-05 08:49:11.505:W/System.err（2363）：位于android.os.Handler.dispatchMessage（Handler.java:102）
08-05 08:49:11.505:W/System.err（2363）：在android.os.Looper.loop（Looper.java:136）上
08-05 08:49:11.505:W/System.err（2363）：位于android.app.ActivityThread.main（ActivityThread.java:5017）
08-05 08:49:11.505:W/System.err（2363）：位于java.lang.reflect.Method.invokenactive（本机方法）
08-05 08:49:11.505:W/System.err（2363）：位于java.lang.reflect.Method.invoke（Method.java:515）
08-05 08:49:11.505:W/System.err（2363）：位于com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run（ZygoteInit.java:779）
08-05 08:49:11.505:W/System.err（2363）：位于com.android.internal.os.ZygoteInit.main（ZygoteInit.java:595）
08-05 08:49:11.505:W/System.err（2363）：在dalvik.System.NativeStart.main（本机方法）
08-05 08:49:11.515:D/AndroidRuntime（2363）：关闭虚拟机
08-05 08:49:11.515:W/dalvikvm（2363）：threadid=1：线程以未捕获异常退出（组=0xb4aa9ba8）
08-05 08:49:11.535:E/AndroidRuntime（2363）：致命异常：主
08-05 08:49:11.535:E/AndroidRuntime（2363）：进程：protect.my.password，PID:2363
08-05 08:49:11.535:E/AndroidRuntime（2363）：java.lang.RuntimeException:无法启动活动组件信息{protect.my.password/protect.my.password.ListView_read}:java.lang.NullPointerException
08-05 08:49:11.535:E/AndroidRuntime（2363）：在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2195）
08-05 08:49:11.535:E/AndroidRuntime（2363）：位于android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2245）
08-05 08:49:11.535:E/AndroidRuntime（2363）：在android.app.ActivityThread.access$800（ActivityThread.java:135）
08-05 08:49:11.535:E/AndroidRuntime（2363）：在android.app.ActivityThread$H.handleMessage（ActivityThread.java:1196）
08-05 08:49:11.535:E/AndroidRuntime（2363）：在android.os.Handler.dispatchMessage（Handler.java:102）上
08-05 08:49:11.535:E/AndroidRuntime（2363）：在android.os.Looper.loop（Looper.java:136）
08-05 08:49:11.535:E/AndroidRuntime（2363）：位于android.app.ActivityThread.main（ActivityThread.java:5017）
08-05 08:49:11.535:E/AndroidRuntime（2363）：位于java.lang.reflect.Method.Invokenactive（本机方法）
08-05 08:49:11.535:E/AndroidRuntime（2363）：位于java.lang.reflect.Method.invoke（Method.java:515）
08-05 08:49:11.535:E/AndroidRuntime（2363）：在com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run（ZygoteInit.java:779）
08-05 08:49:11.535:E/AndroidRuntime（2363）：位于com.android.internal.os.ZygoteInit.main（ZygoteInit.java:595）
08-05 08:49:11.535:E/AndroidRuntime（2363）：在dalvik.system.NativeStart.main（本机方法）
08-05 08:49:11.535:E/AndroidRuntime（2363）：由以下原因引起：java.lang.NullPointerException
08-05 08:49:11.535:E/AndroidRuntime（2363）：位于android.database.sqlite.SQLiteCursor.getColumnIndex（SQLiteCursor.java:178）
08-05 08:49:11.535:E/AndroidRuntime（2363）：位于android.database.AbstractCursor.getColumnIndexOrThrow（AbstractCursor.java:301）
08-05 08:49:11.535:E/AndroidRuntime（2363）：在android.widget.SimpleCursorAdapter.findColumns（SimpleCursorAdapter.java:333）
08-05 08:49:11.535:E/AndroidRuntime（2363）：在android.widget.SimpleCursorAdapter。（SimpleCursorAdapter.java:107）
08-05 08:49:11.535:E/AndroidRuntime（2363）：at protect.my.password.ListView\u read.populateListViewFromDB（ListView\u read.java:69）
08-05 08:49:11.535:E/AndroidRuntime（2363）：at protect.my.password.ListView\u read.onCreate（ListView\u read.java:35）
08-05 08:49:11.535:E/AndroidRuntime（2363）：在android.app.Activity.performCreate（Activity.java:5231）
08