2
嗨,我是Android的業餘愛好者,在使用片段類中的活動方法時遇到了很大的問題。在片段中使用活動方法
我想實施setContentView
,findViewById
和getMenuInflater
。不幸的是,我不知道該怎麼做。
public class WagaFragment extends Fragment{
private Spinner fromSpinner, toSpinner;
private EditText fromEditText, toEditText;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
**setContentView**(R.layout.activity_main);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.units, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
fromSpinner = (Spinner) **findViewById**(R.id.spinner_from);
toSpinner = (Spinner) **findViewById**(R.id.spinner_to);
fromSpinner.setAdapter(adapter);
toSpinner.setAdapter(adapter);
fromEditText = (EditText) **findViewById**(R.id.editText_from);
toEditText = (EditText) **findViewById**(R.id.editText_to);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
toolbar.setTitle(R.string.app_name);
toolbar.setTitleTextColor(Color.YELLOW);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
**getMenuInflater()**.inflate(R.menu.menu_main, menu);
return true;
}
public void konwertuj(View view) {
// Get the string from the Spinners and number from the EditText
String fromString = (String) fromSpinner.getSelectedItem();
String toString = (String) toSpinner.getSelectedItem();
double input = Double.valueOf(fromEditText.getText().toString());
// Convert the strings to something in our Unit enu,
Konwerter.Jednostka fromJednostka = Konwerter.Jednostka.fromString(fromString);
Konwerter.Jednostka toJednostka = Konwerter.Jednostka.fromString(toString);
// Create a converter object and convert!
Konwerter konwerter = new Konwerter(fromJednostka, toJednostka);
double result = konwerter.convert(input);
toEditText.setText(String.valueOf(result));
}
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.tab_fragment_1, container, false);
}
}
你必須回去片段的基礎。這不是你如何創建和膨脹一個片段,並訪問你可以使用的一些Activity方法getActivity() – mobilepotato7
你在設計時不應該在片段中使用activity的方法。你應該把你的片段設計成一個獨立的盒子,它有一個標準的和預定義的界面以及其父活動。片段不應該打破它的邊界,例如片段不應該使用片段的'setContentView'。片段只能對其自己的視圖負責,而不能對其父視圖的視圖負責。 –