如何在RelativeLayout中删除动态创建的视图
如何在RelativeLayout中删除动态创建的视图
提问于 2017-09-18 07:26:20
动态创建布局后，我想根据PreferenceFragment中的切换开关位置显示/隐藏文本视图，但它不起作用：
public class MyFragment extends android.support.v4.app.Fragment {
private TextView tv1;
private TextView tv2;
private TextView tv3;
boolean diagramState;
public MyFragment() {}
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.my_fragment, container, false);
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
View v = getView();
assert v != null;
RelativeLayout relativelayout = v.findViewById(myFragmentlayout);
RelativeLayout.LayoutParams rlp1 = new RelativeLayout.LayoutParams(GridLayout.LayoutParams.MATCH_PARENT, GridLayout.LayoutParams.WRAP_CONTENT);
RelativeLayout.LayoutParams rlp2 = new RelativeLayout.LayoutParams(GridLayout.LayoutParams.WRAP_CONTENT, GridLayout.LayoutParams.WRAP_CONTENT);
RelativeLayout.LayoutParams rlp3 = new RelativeLayout.LayoutParams(GridLayout.LayoutParams.WRAP_CONTENT, GridLayout.LayoutParams.WRAP_CONTENT);
// add text views
TextView tv1 = new TextView(getActivity());
tv1.setText(getString(R.string.blue));
tv1.setTextColor(Color.WHITE);
TextView tv2 = new TextView(getActivity());
tv2.setText(getString(R.string.green));
tv2.setTextColor(Color.WHITE);
TextView tv3 = new TextView(getActivity());
tv3.setText(getString(R.string.orange));
tv3.setTextColor(Color.WHITE);
tv1.setId(View.generateViewId());
tv2.setId(View.generateViewId());
tv3.setId(View.generateViewId());
rlp2.addRule(RelativeLayout.BELOW, tv1.getId());
rlp3.addRule(RelativeLayout.BELOW, tv2.getId());
tv1.setLayoutParams(rlp1);
tv2.setLayoutParams(rlp2);
tv3.setLayoutParams(rlp3);
relativelayout.addView(tv1);
relativelayout.addView(tv2);
relativelayout.addView(tv3);
super.onActivityCreated(savedInstanceState);
}
@Override
public void onResume(){
super.onResume();
loadPreferences();
displaySettings(getView());
}
private void loadPreferences(){
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity().getApplicationContext());
diagramState = sharedPreferences.getBoolean("pref_pref1", true);
}
public void displaySettings() {
if (diagramState) {
tv1.setVisibility(View.VISIBLE);
tv2.setVisibility(View.VISIBLE);
tv3.setVisibility(View.VISIBLE);
} else {
tv1.setVisibility(View.GONE);
tv2.setVisibility(View.GONE);
tv3.setVisibility(View.GONE);
}
}
}回答 1
Stack Overflow用户
回答已采纳
发布于 2017-09-19 00:01:16
您的错误不言而喻，只需在类中全局声明TextView变量即可：
public class MyFragment extends android.support.v4.Fragment {
// Part of your class
private TextView tv1;
private TextView tv2;
private TextView tv3;
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
//Part of your code
// add text views
tv1 = new TextView(getActivity());
tv1.setText(getString(R.string.blue));
tv1.setTextColor(Color.WHITE);
tv2 = new TextView(getActivity());
tv2.setText(getString(R.string.green));
tv2.setTextColor(Color.WHITE);
tv3 = new TextView(getActivity());
tv3.setText(getString(R.string.orange));
tv3.setTextColor(Color.WHITE);
// Rest of your code
}
// Rest of your class
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/46269772
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