我想根据从数据库收到的信息在我的应用中动态添加文本视图。我正在引用线性布局，然后在循环中实例化文本视图，将LayoutParams设置为它们，然后将它们添加到布局中，所有这些都在静态内部片段类中完成。我已经完成了几乎所有的解决方案，我正在做与其他人一样的事情但是当我在设备上运行我的应用程序时，我看不到动态添加的视图。请帮我解决这个问题。 这是我的代码的副本：
public static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
final int PICKFILE_RESULT_CODE = 1;
String FilePath="";
UploadFileAsync u;
public PlaceholderFragment() {
}
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView;
// TextView textView = (TextView) rootView.findViewById(R.id.section_label);
// textView.setText(getString(R.string.section_format, getArguments().getInt(ARG_SECTION_NUMBER)));
int sectionNumber = getArguments().getInt(ARG_SECTION_NUMBER);
switch (sectionNumber){
case 1: rootView = inflater.inflate(R.layout.fragment_faculty_home_info, container, false);
facultyInfoFragment(rootView);
break;
case 2: rootView = inflater.inflate(R.layout.fragment_faculty_home_exam, container, false);
facultyExamFragment(rootView);
break;
case 3: rootView = inflater.inflate(R.layout.fragment_faculty_home_info, container, false);
facultyEventsFragment(rootView);
break;
default: rootView = inflater.inflate(R.layout.fragment_faculty_home_info, container, false);
}
return rootView;
}
public void facultyInfoFragment(View rootView){
TextView facultyInfoName = (TextView)rootView.findViewById(R.id.faculty_info_name_view);
facultyInfoName.setText("Ravi Singh");
TextView facultyInfoID = (TextView)rootView.findViewById(R.id.faculty_info_ID_view);
facultyInfoID.setText("12345");
TextView facultyInfoDept = (TextView)rootView.findViewById(R.id.faculty_info_dept_view);
facultyInfoDept.setText("CSE");
Button facultyInfoCaddButton = (Button)rootView.findViewById(R.id.faculty_info_cADD_button);
Button facultyInfoCdeleteButton = (Button)rootView.findViewById(R.id.faculty_info_cDelete_button);
EditText facultyInfoCIDField = (EditText)rootView.findViewById(R.id.faculty_info_cID_field);
EditText facultyInfoCnameField = (EditText)rootView.findViewById(R.id.faculty_info_cname_field);
if (facultyInfoCIDField.getText().toString() != null && facultyInfoCnameField.getText().toString() != null){
facultyInfoCaddButton.setEnabled(true);
facultyInfoCdeleteButton.setEnabled(true);
}
else{
facultyInfoCaddButton.setEnabled(false);
facultyInfoCdeleteButton.setEnabled(false);
}
facultyInfoCaddButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
facultyInfoCdeleteButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
// this is the part where I dynamically try to add views
LinearLayout facultyInfoLayout = (LinearLayout)rootView.findViewById(R.id.faculty_info_layout);
int numberOfCourses = super.getArguments().getInt(SignupActivity.courses);// no. of courses returned from database
TextView coursesTextView[] = new TextView[numberOfCourses];
for (int i = 0; i < numberOfCourses; i++){
coursesTextView[i] = new TextView(getContext());
coursesTextView[i].setText("CSE1212 RDBMS"); //enter the course ID and course name returned from database
coursesTextView[i].setLayoutParams(new LinearLayoutCompat.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
facultyInfoLayout.addView(coursesTextView[i]);
}
return;
}
public void facultyExamFragment(View rootView){
Button uploadExamScheduleButton = (Button)rootView.findViewById(R.id.faculty_exam_upload_button);
uploadExamScheduleButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
intent.setAction(Intent.ACTION_OPEN_DOCUMENT);
intent.setType("*/*");
startActivityForResult(intent,PICKFILE_RESULT_CODE);
}
});
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
switch(requestCode){
case PICKFILE_RESULT_CODE:
if(resultCode==RESULT_OK){
FilePath = data.getData().getPath();
FilePath=FilePath.split(":")[1];
u=new UploadFileAsync(FilePath);
u.execute("");
}
break;
}
}
public static void facultyEventsFragment(View rootView){
}
}
答案 0 :(得分：0)
为要添加文字视图的父级Linearlayout设置方向。
LinearLayout facultyInfoLayout = (LinearLayout)rootView.findViewById(R.id.faculty_info_layout);
facultyInfoLayout.setOrientation(LinearLayout.VERTICAL);
答案 1 :(得分：0)
删除LinearLayoutCompact而不是仅使用布局参数中的LinearLayout
coursesTextView[i].setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
答案 2 :(得分：0)
这是我的xml部分
<LinearLayout
android:layout_width="match_parent"
android:id="@+id/parent"
android:layout_height="wrap_content"
android:orientation="vertical">
这是我的java部分
LinearLayout parent = (LinearLayout) findViewById(R.id.parent);
TextView coursesTextView[] = new TextView[5];
for (int i = 0; i < 5; i++){
coursesTextView[i] = new TextView(this);
coursesTextView[i].setText("CSE1212 RDBMS"); //enter the course ID and course name returned from database
coursesTextView[i].setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
parent.addView(coursesTextView[i]);
}
这会一个接一个地添加5个文本视图
答案 3 :(得分：0)
更改此行
coursesTextView[i].setLayoutParams(new LinearLayoutCompat.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
到。可能是问题。还设置文字颜色，可能是同一颜色不显示textview。
tv.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));
tv.setTextColor(mHostActivity.getResources().getColor(R.color.orange));