Making table row scrollable in Java in Android Stud

Question

I tried creating a scroll view in my relative layout to make my table layout scrollable but i keep getting this error:

 02-02 19:29:10.116: E/AndroidRuntime(9400): java.lang.RuntimeException: Unable to start activity ComponentInfo{test.com.classmanagertest/test.com.classmanagertest.StudentsMasterList}: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first. 

This is my Table Layout that display's fields in a database:

 @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); setContentView(R.layout.students_masterlist); db=openOrCreateDatabase("ClassManager",MODE_WORLD_WRITEABLE, null); Cursor c=db.rawQuery("SELECT StudPic, StudentID, LastName FROM MasterStudents", null); int count= c.getCount(); c.moveToFirst(); TableLayout tableLayout = new TableLayout(getApplicationContext()); tableLayout.setVerticalScrollBarEnabled(true); TableRow tableRow; TextView textView, textView1; ImageView StudImageView; RelativeLayout rl=(RelativeLayout)findViewById(R.id.layout); ScrollView sv = new ScrollView(this); sv.addView(tableLayout); rl.addView(sv); for (Integer j = 0; j < count; j++) { tableRow = new TableRow(getApplicationContext()); StudImageView = new ImageView(getApplicationContext()); StudImageView.setPadding(20, 20, 20, 20); StudImage=c.getBlob(c.getColumnIndex("StudPic")); Bitmap b1= BitmapFactory.decodeByteArray(StudImage, 0, StudImage.length); StudImageView.setImageBitmap(b1); tableRow.addView(StudImageView); textView1 = new TextView(getApplicationContext()); textView1.setText(c.getString(c.getColumnIndex("StudentID"))); textView1.setPadding(20, 20, 20, 20); textView1.setTextColor(getResources().getColor(R.color.blueactionbar)); textView1.setTextSize(TypedValue.COMPLEX_UNIT_DIP,25); textView1.setTypeface(null, Typeface.BOLD); tableRow.addView(textView1); textView = new TextView(getApplicationContext()); textView.setText(c.getString(c.getColumnIndex("LastName"))); textView.setPadding(20, 20, 20, 20); textView.setTextColor(getResources().getColor(R.color.blueactionbar)); textView.setTextSize(TypedValue.COMPLEX_UNIT_DIP,25); textView.setTypeface(null, Typeface.BOLD); tableRow.addView(textView); tableLayout.addView(tableRow); c.moveToNext() ; } setContentView(tableLayout); db.close(); } 

This is my xml file:

 <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/white" android:layout_gravity="center_horizontal" android:scrollbars="vertical|horizontal" android:id="@+id/layout"> </RelativeLayout> 

How do I fix this error?

Any help is appreciated! Thank you so much!

Answer 1

 @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); setContentView(R.layout.students_masterlist); db=openOrCreateDatabase("ClassManager",MODE_WORLD_WRITEABLE, null); Cursor c=db.rawQuery("SELECT StudPic, StudentID, LastName FROM MasterStudents", null); int count= c.getCount(); c.moveToFirst(); TableLayout tableLayout = new TableLayout(getApplicationContext()); tableLayout.setVerticalScrollBarEnabled(true); TableRow tableRow; TextView textView, textView1; ImageView StudImageView; RelativeLayout rl=(RelativeLayout)findViewById(R.id.layout); ScrollView sv = new ScrollView(this); sv.addView(tableLayout); rl.addView(sv); for (Integer j = 0; j < count; j++) { tableRow = new TableRow(getApplicationContext()); StudImageView = new ImageView(getApplicationContext()); StudImageView.setPadding(20, 20, 20, 20); StudImage=c.getBlob(c.getColumnIndex("StudPic")); Bitmap b1= BitmapFactory.decodeByteArray(StudImage, 0, StudImage.length); StudImageView.setImageBitmap(b1); tableRow.addView(StudImageView); textView1 = new TextView(getApplicationContext()); textView1.setText(c.getString(c.getColumnIndex("StudentID"))); textView1.setPadding(20, 20, 20, 20); textView1.setTextColor(getResources().getColor(R.color.blueactionbar)); textView1.setTextSize(TypedValue.COMPLEX_UNIT_DIP,25); textView1.setTypeface(null, Typeface.BOLD); tableRow.addView(textView1); textView = new TextView(getApplicationContext()); textView.setText(c.getString(c.getColumnIndex("LastName"))); textView.setPadding(20, 20, 20, 20); textView.setTextColor(getResources().getColor(R.color.blueactionbar)); textView.setTextSize(TypedValue.COMPLEX_UNIT_DIP,25); textView.setTypeface(null, Typeface.BOLD); tableRow.addView(textView); tableLayout.addView(tableRow); c.moveToNext() ; } db.close(); rl.requestLayout(); } 

The First setContentView is called with the parenet relative layout which contains the table layout that has your rows.Therefore you are trying to setContentView to a view which is contained in the parent that you have already setContentView to ie.

rl contains sv contains tableLayout . but you are setting the activity view first to rl then to tableLayout .

Instead you should set the content view to rl .Then fill your tableLayout like you did and refresh the layout.ie call requestLayout() on the parent view.