android - TextView不會在UI中更新

-1

//This is the TextViewExample class 
public class TextViewExample { 

private TextView mTextViewExample; 

public TextViewExample(Activity activity) { 
    mActivity = activity; 
    mTextViewExample = (TextView)mActivity.findViewById(R.id.TextViewLayout); 
    } 
} 

//This is the Fragment class 
public class TextViewFragment extends Fragment { 

    private TextViewExample mText; 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    mText = new TextViewExample(getActivity()); 
    } 
}

mText未在UI中更新！有人可以解釋正確顯示TextView從調用片段中的活動的正確方法。android - TextView不會在UI中更新

感謝=）

來源

2016-07-28 CWHsu

可以直接通過'findViewById'訪問'TextView'在'onCrateView'，你爲什麼用'TextViewExample'？ –

您是否在作爲參數傳遞給您的課程的活動中調用了setContentView（..）？ – user1841702

你還沒有誇大任何＆如果你想創建一個動態的TextView，那麼你需要將其添加到您的佈局。我沒有看到任何特定的Android標準..請學習android＆fragment的基本知識.. !! –

您可以訪問（Activity的TextView片段中的假設這片段連接到活動）直接：

//This is the Fragment class 
public class TextViewFragment extends Fragment { 
    private TextView mText; 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     // you need to inflate the xml file holding this TextView. 
     mText = (TextView) getActivity().findViewByid(R.id.<your-text-view-id>; 
     // do something with your TextView 
    } 
}

請務必檢查getActivity() == null避免NPE的。

來源

2016-07-28 23:22:00 Nerd

活動：

public class MainActivity { 

    private TextView mTextViewExample; 

    protected void onCreate(Bundle savedInstanceState) { 
     ... 
     mTextViewExample = (TextView) findViewById(R.id.TextViewLayout); 
     } 
    } 

    public void setTextViewExampleText(String text) { 
     mTextViewExample.setText(text); 
    }

TextViewFragment

public class TextViewFragment extends Fragment { 

    @Override 
    public void onActivityCreated(@Nullable Bundle savedInstanceState) { 
     ((MainActivity) getActivity()).setTextViewExampleText("text"); 
    } 
}

來源

2016-07-29 06:49:36 faranjit

android - TextView不會在UI中更新

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