的setText强制关闭试图在TextView中显示文本时

这是主要的java文件，我试图用settext方法，但每次我使用它，它给了我强制关闭的setText强制关闭试图在TextView中显示文本时

public class SecondActivity extends Activity { 

    TextView myAwesomeTextView; 

     @Override 
     public void onCreate(Bundle savedInstanceState) { 

     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     myAwesomeTextView = (TextView) findViewById(R.id.myAwesomeTextView); 
     myAwesomeTextView.setText("My Awesome Text"); 


    } 
    }

XML

<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

<TextView 
    android:id="@+id/myAwesomeTextView" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="s" 
    android:textSize="20sp" 
    android:editable="true"/> 
</LinearLayout>

这是我的第一个应用程序，所以我不知道很多有关Android的我搜索了很多，但我coudnt修复它，因此我要求最好group.thankyou

logcat的

12-13 12:21:37.946 29196-29196/eu.itcsolutions.android.tutorial D/AndroidRuntime﹕ Shutting down VM 
12-13 12:21:37.947 29196-29196/eu.itcsolutions.android.tutorial E/AndroidRuntime﹕ FATAL EXCEPTION: main 
    Process: eu.itcsolutions.android.tutorial, PID: 29196 
    java.lang.RuntimeException: Unable to start activity ComponentInfo{eu.itcsolutions.android.tutorial/eu.itcsolutions.android.tutorial.SecondActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference 
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298) 
      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360) 
      at android.app.ActivityThread.access$800(ActivityThread.java:144) 
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278) 
      at android.os.Handler.dispatchMessage(Handler.java:102) 
      at android.os.Looper.loop(Looper.java:135) 
      at android.app.ActivityThread.main(ActivityThread.java:5221) 
      at java.lang.reflect.Method.invoke(Native Method) 
      at java.lang.reflect.Method.invoke(Method.java:372) 
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694) 
    Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference 
      at eu.itcsolutions.android.tutorial.SecondActivity.onCreate(SecondActivity.java:47) 
      at android.app.Activity.performCreate(Activity.java:5933) 
      at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105) 
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251) 
      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360) 
      at android.app.ActivityThread.access$800(ActivityThread.java:144) 
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278) 
      at android.os.Handler.dispatchMessage(Handler.java:102) 
      at android.os.Looper.loop(Looper.java:135) 
      at android.app.ActivityThread.main(ActivityThread.java:5221) 
      at java.lang.reflect.Method.invoke(Native Method) 
      at java.lang.reflect.Method.invoke(Method.java:372) 
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694) 
12-13 12:21:39.658 29196-29196/eu.itcsolutions.android.tutorial I/Process﹕ Sending signal. PID: 29196 SIG: 9

来源

2014-12-13 Shalom Mathews

可以请您发布错误日志吗？ – 2014-12-13 06:43:21

不知道什么是错误，我们不能指导。 – Shvet 2014-12-13 06:52:49

http://pastebin.com/7R7cHtp5是这样吗？ – 2014-12-13 06:56:01

您需要使用setContentView(R.layout.second)而不是setContentView(R.layout.main)。

public class SecondActivity extends Activity { 

    TextView myAwesomeTextView; 

     @Override 
     public void onCreate(Bundle savedInstanceState) { 

     super.onCreate(savedInstanceState); 
     setContentView(R.layout.second); 

     myAwesomeTextView = (TextView) findViewById(R.id.myAwesomeTextView); 
     myAwesomeTextView.setText("My Awesome Text"); 


    } 
    }

来源

2014-12-13 07:06:15 Shvet

的setText强制关闭试图在TextView中显示文本时

回答

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