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我想寫這個簡單的類,它將採取用戶輸入並將其顯示到 文本視圖,但每次我嘗試運行它時,我在我的主要中得到一個致命錯誤類。我是一個新手,我知道這是簡單的事情,但對於我的生活我找不到它!任何幫助不勝感激。請參閱我下面的代碼來創建類簡單的android類用戶輸入空指針異常
package com.ObComDis.wayne;
import android.app.Activity;
import android.os.Bundle;
import java.util.Date;
import android.app.Activity;
import android.os.Bundle;
import android.text.format.DateFormat;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class ObComDisActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
String name;
EditText et = (EditText) findViewById(R.id.edittext);
TextView t = (TextView) findViewById(R.id.textView1);
public String getName()
{
String name = et.getText().toString();
return name;
}
public void main (String args [])
{
ObComDisActivity myocd = new ObComDisActivity();
t.setText(name);
}
}
這裏是我從日誌貓獲取讀數.....
07-11 18:55:01.149: D/AndroidRuntime(525): Shutting down VM
07-11 18:55:01.149: W/dalvikvm(525): threadid=1: thread exiting with uncaught exception (group=0x40015560)
07-11 18:55:01.189: E/AndroidRuntime(525): FATAL EXCEPTION: main
07-11 18:55:01.189: E/AndroidRuntime(525): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.ObComDis.wayne/com.ObComDis.wayne.ObComDisActivity}: java.lang.NullPointerException
07-11 18:55:01.189: E/AndroidRuntime(525): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1569)
07-11 18:55:01.189: E/AndroidRuntime(525): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
07-11 18:55:01.189: E/AndroidRuntime(525): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
07-11 18:55:01.189: E/AndroidRuntime(525): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
07-11 18:55:01.189: E/AndroidRuntime(525): at android.os.Handler.dispatchMessage(Handler.java:99)
07-11 18:55:01.189: E/AndroidRuntime(525): at android.os.Looper.loop(Looper.java:123)
07-11 18:55:01.189: E/AndroidRuntime(525): at android.app.ActivityThread.main(ActivityThread.java:3683)
07-11 18:55:01.189: E/AndroidRuntime(525): at java.lang.reflect.Method.invokeNative(Native Method)
07-11 18:55:01.189: E/AndroidRuntime(525): at java.lang.reflect.Method.invoke(Method.java:507)
07-11 18:55:01.189: E/AndroidRuntime(525): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
07-11 18:55:01.189: E/AndroidRuntime(525): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
07-11 18:55:01.189: E/AndroidRuntime(525): at dalvik.system.NativeStart.main(Native Method)
07-11 18:55:01.189: E/AndroidRuntime(525): Caused by: java.lang.NullPointerException
07-11 18:55:01.189: E/AndroidRuntime(525): at android.app.Activity.findViewById(Activity.java:1647)
07-11 18:55:01.189: E/AndroidRuntime(525): at com.ObComDis.wayne.ObComDisActivity.<init>(ObComDisActivity.java:25)
07-11 18:55:01.189: E/AndroidRuntime(525): at java.lang.Class.newInstanceImpl(Native Method)
07-11 18:55:01.189: E/AndroidRuntime(525): at java.lang.Class.newInstance(Class.java:1409)
07-11 18:55:01.189: E/AndroidRuntime(525): at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
07-11 18:55:01.189: E/AndroidRuntime(525): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1561)
07-11 18:55:01.189: E/AndroidRuntime(525): ... 11 more
你可以格式化你的日誌貓在看?如果可能的話發佈到pastebin。按原樣閱讀是一種痛苦。 – Mob 2012-07-11 19:04:41
對不起!不知道你的意思是把它貼到貼紙箱上?我怎樣才能格式化它?我只是將我的日誌貓中的內容粘貼到這個問題上?謝謝。/ – meself1000 2012-07-12 17:29:59