我想根据从数据库收到的信息在我的应用程序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，为它们设置 LayoutParams，然后将它们添加到布局中，所有这些都是在静态内部片段类中完成的。我已经经历了几乎所有的解决方案，我正在做与其他人相同的事情，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){
}
}
为要向其添加文本视图的父线性布局设置方向。
LinearLayout facultyInfoLayout = (LinearLayout)rootView.findViewById(R.id.faculty_info_layout);
facultyInfoLayout.setOrientation(LinearLayout.VERTICAL);
删除LinearLayoutCompact改为在布局参数中仅使用LinearLayout
coursesTextView[i].setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
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]);
}
这将一个接一个地添加 5 个文本视图
更改此行
coursesTextView[i].setLayoutParams(new LinearLayoutCompat.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
自。可能是有问题，并且还设置了文本颜色，可能是相同的颜色不显示文本视图。
tv.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));
tv.setTextColor(mHostActivity.getResources().getColor(R.color.orange));