我收到Java空指针异常无法启动接收器错误，
我的LogCat
04-23 21:55:16.889: I/TextView(8039): *****onCrecateContextMenu::isInputMethodTarget:true, isIMEChangable;true
04-23 21:55:25.479: D/AndroidRuntime(8039): Shutting down VM
04-23 21:55:25.479: W/dalvikvm(8039): threadid=1: thread exiting with uncaught exception (group=0x40018578)
04-23 21:55:25.479: E/AndroidRuntime(8039): FATAL EXCEPTION: main
04-23 21:55:25.479: E/AndroidRuntime(8039): java.lang.RuntimeException: Unable to start receiver com.yp.iss_project.CbReceiver: java.lang.NullPointerException
04-23 21:55:25.479: E/AndroidRuntime(8039): at android.app.ActivityThread.handleReceiver(ActivityThread.java:1809)
04-23 21:55:25.479: E/AndroidRuntime(8039): at android.app.ActivityThread.access$2400(ActivityThread.java:117)
04-23 21:55:25.479: E/AndroidRuntime(8039): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:985)
04-23 21:55:25.479: E/AndroidRuntime(8039): at android.os.Handler.dispatchMessage(Handler.java:99)
04-23 21:55:25.479: E/AndroidRuntime(8039): at android.os.Looper.loop(Looper.java:130)
04-23 21:55:25.479: E/AndroidRuntime(8039): at android.app.ActivityThread.main(ActivityThread.java:3687)
04-23 21:55:25.479: E/AndroidRuntime(8039): at java.lang.reflect.Method.invokeNative(Native Method)
04-23 21:55:25.479: E/AndroidRuntime(8039): at java.lang.reflect.Method.invoke(Method.java:507)
04-23 21:55:25.479: E/AndroidRuntime(8039): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
04-23 21:55:25.479: E/AndroidRuntime(8039): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
04-23 21:55:25.479: E/AndroidRuntime(8039): at dalvik.system.NativeStart.main(Native Method)
04-23 21:55:25.479: E/AndroidRuntime(8039): Caused by: java.lang.NullPointerException
04-23 21:55:25.479: E/AndroidRuntime(8039): at com.yp.iss_project.CbReceiver.onReceive(CbReceiver.java:272)
04-23 21:55:25.479: E/AndroidRuntime(8039): at android.app.ActivityThread.handleReceiver(ActivityThread.java:1798)
04-23 21:55:25.479: E/AndroidRuntime(8039): ... 10 more
04-23 21:56:57.819: W/KeyCharacterMap(8162): No keyboard for id 0
04-23 21:56:57.819: W/KeyCharacterMap(8162): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
04-23 21:57:00.359: I/TextView(8162): *****onCrecateContextMenu::isInputMethodTarget:true, isIMEChangable;true
04-23 21:57:08.069: D/AndroidRuntime(8162): Shutting down VM
04-23 21:57:08.069: W/dalvikvm(8162): threadid=1: thread exiting with uncaught exception (group=0x40018578)
04-23 21:57:08.069: E/AndroidRuntime(8162): FATAL EXCEPTION: main
04-23 21:57:08.069: E/AndroidRuntime(8162): java.lang.RuntimeException: Unable to start receiver com.yp.iss_project.CbReceiver: java.lang.NullPointerException
04-23 21:57:08.069: E/AndroidRuntime(8162): at android.app.ActivityThread.handleReceiver(ActivityThread.java:1809)
04-23 21:57:08.069: E/AndroidRuntime(8162): at andr oid.app.ActivityThread.access$2400(ActivityThread.java:117)
04-23 21:57:08.069: E/AndroidRuntime(8162): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:985)
04-23 21:57:08.069: E/AndroidRuntime(8162): at android.os.Handler.dispatchMessage(Handler.java:99)
04-23 21:57:08.069: E/AndroidRuntime(8162): at android.os.Looper.loop(Looper.java:130)
04-23 21:57:08.069: E/AndroidRuntime(8162): at android.app.ActivityThread.main(ActivityThread.java:3687)
04-23 21:57:08.069: E/AndroidRuntime(8162): at java.lang.reflect.Method.invokeNative(Native Method)
04-23 21:57:08.069: E/AndroidRuntime(8162): at java.lang.reflect.Method.invoke(Method.java:507)
04-23 21:57:08.069: E/AndroidRuntime(8162): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
04-23 21:57:08.069: E/AndroidRuntime(8162): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
04-23 21:57:08.069: E/AndroidRuntime(8162): at dalvik.system.NativeStart.main(Native Method)
04-23 21:57:08.069: E/AndroidRuntime(8162): Caused by: java.lang.NullPointerException
04-23 21:57:08.069: E/AndroidRuntime(8162): at com.yp.iss_project.CbReceiver.onReceive(CbReceiver.java:273)
04-23 21:57:08.069: E/AndroidRuntime(8162): at android.app.ActivityThread.handleReceiver(ActivityThread.java:1798)
04-23 21:57:08.069: E/AndroidRuntime(8162): ... 10 more
04-23 21:59:10.639: I/TextView(8265): *****onCrecateContextMenu::isInputMethodTarget:true, isIMEChangable;true
04-23 21:59:19.979: D/AndroidRuntime(8265): Shutting down VM
04-23 21:59:19.979: W/dalvikvm(8265): threadid=1: thread exiting with uncaught exception (group=0x40018578)
我的广播接收器是
public static String str;
public static int my;
public static String MSG = encrypt.message;
public final String ALPHABET = "abcdefghijklmnopqrstuvwxyz";
public void onReceive(Context context, Intent intent) {
//---get the CB message passed in---
Bundle bundle = intent.getExtras();
SmsCbMessage[] msgs = null;
if (bundle != null) {
//---retrieve the SMS message received---
Object[] pdus = (Object[]) bundle.get("pdus");
msgs = new SmsCbMessage[pdus.length];
for (int i=0; i<msgs.length; i++) {
msgs[i] = SmsCbMessage.createFromPdu((byte[])pdus[i]);
str = "";
str +="" +msgs[i].getGeographicalScope() + msgs[i].getMessageCode() + msgs[i].getMessageIdentifier() + msgs[i].getUpdateNumber();
my = msgs[i].getGeographicalScope() + msgs[i].getMessageCode() + msgs[i].getMessageIdentifier() + msgs[i].getUpdateNumber();
if(str != "")
{
Toast.makeText(context, "CB: " +str, Toast.LENGTH_LONG).show();
Toast.makeText(context, "MY: " +my, Toast.LENGTH_LONG).show();
{
String cipherText="";
for(int y=0;y<MSG.length();y++)
{
int charPosition = ALPHABET.indexOf(MSG.charAt(y));
int keyVal = (my + charPosition)%26;
char replaceVal = this.ALPHABET.charAt(keyVal);
cipherText += replaceVal;
}
Toast.makeText(context, "CipherText: " +cipherText, Toast.LENGTH_LONG).show();
}
}
}
abortBroadcast();
}
答案 0 :(得分：2)
已移除
public static String MSG = encrypt.message;
并用
替换所有出现的MSGencrypt.message
我的错误是从加密类传递值pf消息，因为在接收器类中声明的MSG值为null我收到了空指针异常。