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我是新的android開發,我試圖與我的片段組件(Edittext,按鈕,...)但我得到一個空指針異常。Android的空指針片段組件
這裏是我的onCreate方法的代碼:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_menu);
idCpt = (EditText) findViewById(R.id.idCapteurEditText);
capBtn = (Button) findViewById(R.id.CapteurBtn);
final AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
idCpt.setText("exemple");
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}
任何想法嗎?
,我認爲你的widget是存在於'fragment_activity'所以把你的代碼片段類或把小部件上'activity_main_menu' –