我在我的應用程序 錯誤我的java文件之一收到錯誤是:java.lang.NullPointerException
Unfortunatetly應用程序已經停止在Android模擬器
我得到的下面一行,
String getName = name.getText().toString();
這裏我的代碼,在那裏我在detailSave方法得到錯誤
public class Contact_Details extends ActionBarActivity {
Button save, show;
EditText name, email, phnno;
DataHandler handler;
long id;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_contact__details);
save = (Button) findViewById(R.id.c_save);
show = (Button) findViewById(R.id.c_show);
name = (EditText) findViewById(R.id.c_name);
email = (EditText) findViewById(R.id.c_email);
phnno = (EditText) findViewById(R.id.c_phnno);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction().add(R.id.container, new PlaceholderFragment()).commit();
}
}
/*
* public void detailSave(View v) { String getName =
* name.getText().toString(); String getEmail = email.getText().toString();
* String getPhnno = phnno.getText().toString(); handler = new
* DataHandler(getBaseContext()); handler.open(); id =
* handler.insertData(getName, getEmail, getPhnno);
* Toast.makeText(getBaseContext(), "Data inserted",
* Toast.LENGTH_LONG).show(); handler.close(); }
*/
public void detailSave(View v) {
String getName = name.getText().toString();
String getEmail = email.getText().toString();
String getPhnno = phnno.getText().toString();
if (getName != null && getEmail != null && getPhnno != null) {
handler = new DataHandler(getBaseContext());
handler.open();
long id = handler.insertData(getName, getEmail, getPhnno);
Toast.makeText(getBaseContext(), "Data inserted", Toast.LENGTH_LONG).show();
handler.close();
}
}
public void detailShow(View v) {
String getName, getEmail, getPhnno;
getName = "";
getEmail = "";
getPhnno = "";
handler = new DataHandler(getBaseContext());
handler.open();
Cursor C = handler.returnData();
if (C.moveToFirst()) {
do {
getName = C.getString(0);
getEmail = C.getString(1);
getPhnno = C.getString(2);
} while (C.moveToNext());
}
handler.close();
Toast.makeText(getBaseContext(), "Name :" + getName + "\n Email :" + getEmail + "\n Contact No :" + getPhnno,
Toast.LENGTH_LONG).show();
}
}
的logcat:
2月9日至1日:53:44.068:d/dalvikvm(1162):GC_FOR_ALLOC釋放142K,7%的遊離 3231K/3444K,暫停61ms,共73ms 2月9日至1日:53:49.408: d/AndroidRuntime (1162):關閉虛擬機09-01 02:53:49.408: W/dalvikvm(1162):threadid = 1:線程以未捕獲的異常退出 (group = 0xb1a68ba8)09-01 02:53:49.458:E/AndroidRuntime(1162):致命 EXCEPTION:main 09-01 02:53:49.458:E/AndroidRuntime(1162):進程: com.example.wedding_app,PID:1162 09-01 02:53:49.458: E/AndroidRuntime(1162):java.lang.IllegalStateException:不能 執行活動的方法09-01 02:53:49.458: E/AndroidRuntime(1162):在 android.view.View $ 1.onClick(View.java:3823)09-01 02:53:49.458: E/AndroidRuntime(1162):at android.view.View.performClick(View.java:4438)09 -01 02:53:49.458: E/AndroidRuntime(1162):at android.view.View $ PerformClick.run(View.java:18422)09-01 02:53:49.458:E/AndroidRuntime(1162) :at android.os.Handler.handleCallback(Handler.java:733)09-01 02:53:49.458:E/AndroidRuntime(1162):at android.os.Handler.dispatchMessage(Handler.java:95) E/AndroidRuntime(1162):09-01 02:53:49.458:E/AndroidRuntime(1162):at android.os.Looper.loop(Looper.java:136)09-01 02:53:49.458: E/at android.app.ActivityThread.main(Activ ityThread.java:5017)09-01 02:53:49.458:E/AndroidRuntime(1162):at java.lang.reflect.Method.invokeNative(Native Method)09-01 02:53:49.458:E/AndroidRuntime(1162):at java.lang.reflect.Method.invoke(Method.java:515)09-01 02:53:49.458: E/AndroidRuntime(1162):at com.android.internal.os。 ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:779) 09-01 02:53:49.458:E/AndroidRuntime(1162):at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)09 -01 02:53:49.458:E/AndroidRuntime(1162):在 dalvik.system.NativeStart.main(本機方法)二月9日至1日:53:49.458: E/AndroidRuntime(1162):由: 的java.lang.ref lect.InvocationTargetException 09-01 02:53:49.458: E/AndroidRuntime(1162):at java.lang.reflect.Method.invokeNative(Native Method)09-01 02:53:49.458:E/AndroidRuntime(1162) ):在 java.lang.reflect.Method.invoke(Method.java:515)09-01 02:53:49.458: E/AndroidRuntime(1162):at android.view.View $ 1.onClick(View。 java:3818)09-01 02:53:49.458: E/AndroidRuntime(1162):... 11更多09-01 02:53:49.458: E/AndroidRuntime(1162):由...引發:java.lang。 NullPointerException 09-01 02:53:49.458:E/AndroidRuntime(1162):at com.example.wedding_app.Contact_Details.detailSave(Contact_Details.java:56) 09-01 02:53:49.458:E/AndroidRuntime 1162):...14更多09-01 02:53:52.018:I /過程(1162):發送信號。 PID:1162 SIG:9 09-01 02:53:55.038:D/gralloc_goldfish(1192):未檢測到GPU仿真的仿真器 。
請幫我解決這個問題。
你可以發佈crashcat logcat嗎? – 2014-09-01 06:30:37
你的'activity_contact__details'佈局中有什麼?看起來像 http://stackoverflow.com/questions/23653778/nullpointerexception-accessing-views-in-oncreate – laalto 2014-09-01 06:31:30
是'name' null或'name.getText()'? – Soana 2014-09-01 06:36:35