Android:NullPointerException错误 [英] Android: NullPointerException error
问题描述
我知道询问NullPointerException的答案很乏味,并且那里也有类似的问题.但是,我只是无法从其他问题中找到解决问题的方法.
I know it is dull to ask answers for a NullPointerException, and there are similar questions out there. However, I just cannot find a solution for my problem from the other questions.
我有2个课程:
- CreateContactActivityl.java:
将文本输出的意图传递给RegexOCR1.java
Passes intent of a text output to RegexOCR1.java
- RegexOCR1.java:
接收文本输出,将文本输出传递给此类中的方法
Receives the text output, pass text output into a method that is within this class
如logcat所述,该错误在RegexOCR1.java中发生:
The error occurs in RegexOCR1.java as stated by the logcat:
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$MethodAndArgsCaller.run(ZygoteInit.java:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
我还实现了Crashlytics进行调试,如下面的链接所示:
I have also implemented Crashlytics for debugging as shown in the link below:
在 CreateContactActivityOCR.java 中:
下面是将文本输出的意图传递给RegexOCR1.java的代码
Below are the codes that passes the intent of text output to RegexOCR1.java
private void passText(){
//Log.i(TAG, "PassText");
Intent intent = new Intent(this, RegexOCR1.class);
startActivity(intent);
}
在RegexOCR1.java中:
In RegexOCR1.java:
下面是我用来接收文本输出然后传递给方法EmailValidator()的代码:
Below are the codes that I used to receives text output and then passes in the method EmailValidator():
public class RegexOCR1 extends Activity {
private Pattern pattern;
private Matcher matcher;
private String recognizedText, textToUse;
private String mFromLang, mCurrentLang;
private static final String EMAIL_PATTERN =
"^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@"
+ "[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$";
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);
}
}
我无法确定RegexOCR1.java中哪个进程发生错误.
I can't figure at which process within RegexOCR1.java does the error occurs.
根据Crashlytics,它是第32行:recognizedText = extras.getString("TEXT");
According to Crashlytics, it is line 32: recognizedText = extras.getString("TEXT");
但是,我在CreateContactActivityOCR.java中使用了这一行来收集来自另一个类的文本输出,而没有错误.
However, I have used this line in CreateContactActivityOCR.java to collect the text output from another class with no error.
推荐答案
private void passText(){
//Log.i(TAG, "PassText");
Intent intent = new Intent(this, RegexOCR1.class);
intent.putExtra("TEXT", "your text here");
startActivity(intent);
}
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