Android：NullPointerException錯誤

我知道它是無聊的問一個NullPointerException的答案，也有類似的問題。但是，我從其他問題找不到解決方案。Android：NullPointerException錯誤

我有2類：

CreateContactActivityl.java：

通行證文本輸出的意圖RegexOCR1.java

RegexOCR1。 java：

接收文本輸出，將文本輸出傳遞給一個方法是這個類RegexOCR1.java發生

的誤差範圍內由logcat的指出：如示於下鏈路

Fatal Exception: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.l33902.contactmanagment1512/com.example.l33902.contactmanagment.RegexOCR1}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.os.Bundle.getString(java.lang.String)' on a null object reference 
     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3155) 
     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3263) 
     at android.app.ActivityThread.access$1000(ActivityThread.java:197) 
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1687) 
     at android.os.Handler.dispatchMessage(Handler.java:102) 
     at android.os.Looper.loop(Looper.java:145) 
     at android.app.ActivityThread.main(ActivityThread.java:6897) 
     at java.lang.reflect.Method.invoke(Method.java) 
     at java.lang.reflect.Method.invoke(Method.java:372) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199) 
Caused by java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.os.Bundle.getString(java.lang.String)' on a null object reference 
     at com.example.l33902.contactmanagment.RegexOCR1.onCreate(RegexOCR1.java:32) 
     at android.app.Activity.performCreate(Activity.java:6550) 
     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1120) 
     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3108) 
     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3263) 
     at android.app.ActivityThread.access$1000(ActivityThread.java:197) 
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1687) 
     at android.os.Handler.dispatchMessage(Handler.java:102) 
     at android.os.Looper.loop(Looper.java:145) 
     at android.app.ActivityThread.main(ActivityThread.java:6897) 
     at java.lang.reflect.Method.invoke(Method.java) 
     at java.lang.reflect.Method.invoke(Method.java:372) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)

我還實施Crashlytics用於調試：

Crashlytics Results

In CreateContactActivityOCR.java：

下面的ar Ë該傳遞的文本輸出到RegexOCR1.java

private void passText(){ 
     //Log.i(TAG, "PassText"); 
     Intent intent = new Intent(this, RegexOCR1.class); 
     startActivity(intent); 
    }

意圖在RegexOCR1.java代碼：

下面是我用於接收文本輸出，然後通過在該方法中爲EmailValidator代碼（）：

public class RegexOCR1 extends Activity { 

    private Pattern pattern; 
    private Matcher matcher; 

    private String recognizedText, textToUse; 
    private String mFromLang, mCurrentLang; 

    private static final String EMAIL_PATTERN = 
      "^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@" 
        + "[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$"; 

    private static final String PHONE_PATTERN = 
      "^[89]\\d{7}$"; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     super.onCreate(savedInstanceState); 

     // Getting the path of the image from another class 
     Bundle extras = this.getIntent().getExtras(); 
     recognizedText = extras.getString("TEXT"); 
     textToUse = recognizedText; 

     // Getting the language used for text recognition 
     mFromLang = extras.getString("LANG"); 
     mCurrentLang = mFromLang; 
     //Log.i(TAG, mFromLang); 

     EmailValidator(); 
    } 


    public String EmailValidator() { 

     Pattern pattern = Pattern.compile(EMAIL_PATTERN); 
     Matcher matcher = pattern.matcher(textToUse); 
     if (matcher.find()) { 
      String email = textToUse.substring(matcher.start(), matcher.end()); 

     } else { 
      // TODO handle condition when input doesn't have an email address 
     } 

     return textToUse; 
    } 

    public boolean validate(final String hex) { 

     matcher = pattern.matcher(hex); 
     return matcher.matches(); 

    } 

    private void showText(){ 
     //Log.i(TAG, "ShowText"); 
     Intent intent = new Intent(this, CreateContactActivityOCR.class); 
     startActivity(intent); 
    } 
}

我無法確定RegexOCR1.java中哪個進程發生錯誤。

根據Crashlytics，它是線32：recognizedText = extras.getString("TEXT");

然而，我已經使用在CreateContactActivityOCR.java這條線，以收集從另一個類輸出的文本，並沒有錯誤。

來源

2016-01-21 Daniel Louis

您需要驗證「getIntent（）」非空，而「額外」的是在你的非空「的onCreate（）」方法。它在某些情況下可能爲空。 –

但你沒有通過startActivity傳遞兩個值Intent –

你在哪裏設置了''TEXT'的值，在''passText''函數中，你錯過了它 –

private void passText(){ 
    //Log.i(TAG, "PassText"); 
    Intent intent = new Intent(this, RegexOCR1.class); 
    intent.putExtra("TEXT", "your text here"); 
    startActivity(intent); 
}

來源

2016-01-21 07:23:00

嘗試下面的代碼和並再次運行

private void passText(){ 
    //Log.i(TAG, "PassText"); 
    Intent intent = new Intent(this, RegexOCR1.class); 
    intent.putExtra("TEXT","YOUR STRING DATA"); 
    intent.putExtra("LANG","YOUR STRING DATA"); 
    startActivity(intent); 
}

來源

2016-01-21 07:22:26

Android：NullPointerException錯誤

回答

相關問題