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Android: using fragments programmatically

For some reason I cannot use xml layout files.

But I need to create an Android application for the tablet.

I decided to use fragments.

I want to create the same layout that this xml generates:

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="fill_parent"> <fragment class="com.example.ItemsList" android:id="@+id/items_list" android:layout_weight="1" android:layout_width="0dp" android:layout_height="fill_parent" /> <FrameLayout android:id="@+id/item_details" android:layout_weight="1" android:layout_width="0dp" android:layout_height="fill_parent" android:background="?android:attr/detailsElementBackground" /> </LinearLayout>

But I have problems adding fragments to my linearLayout:

  public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(createUI()); } private View createUI() { LinearLayout layout = new LinearLayout(this); layout.setOrientation(LinearLayout.HORIZONTAL); layout.setLayoutParams(new LinearLayout.LayoutParams(AbsListView.LayoutParams.FILL_PARENT, AbsListView.LayoutParams.FILL_PARENT)); layout.setId(0x101); { FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction(); fragmentTransaction.add(0x101, new ItemsList()); fragmentTransaction.add(0x101, new ItemDetails()); fragmentTransaction.commit(); } return layout; }

In fact, I can’t even create a LinearLayout with two identical fragments:

  ... fragmentTransaction.add(0x101, new ItemsList()); fragmentTransaction.add(0x101, new ItemsList()); ...

Please, help

Btw I can’t understand why we need to declare “FrameLayout” for the itemDetails fragment, but the “fragment” is enough for the itemList ListFragment?

UPD:

To do this, simply add the third parameter:

  ... fragmentTransaction.add(0x101, new ItemsList(), "uniqueTag1"); fragmentTransaction.add(0x101, new ItemsList(), "uniqueTag2"); ...

The default value for the tag parameter is null, so I tried to create two different elements with the same identifiers. Thanks p-lo for his comment.

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2 answers

I have found a solution.

(the best question has been added to the question. Thanks, p-lo)

If you want to place more than one activity fragment, you must create layouts for each fragment:

  private View createUI() { LinearLayout layout = new LinearLayout(this); layout.setOrientation(LinearLayout.HORIZONTAL); layout.setLayoutParams(new LinearLayout.LayoutParams(AbsListView.LayoutParams.FILL_PARENT, AbsListView.LayoutParams.FILL_PARENT)); LinearLayout innerLayout1 = new LinearLayout(this); innerLayout1.setLayoutParams(new LinearLayout.LayoutParams(300, ViewGroup.LayoutParams.FILL_PARENT)); innerLayout1.setId(ITEMS_LIST_ID); { FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction(); fragmentTransaction.add(ITEMS_LIST_ID, new ItemsList()); fragmentTransaction.commit(); } layout.addView(innerLayout1); LinearLayout innerLayout2 = new LinearLayout(this); innerLayout2.setLayoutParams(new LinearLayout.LayoutParams(300, ViewGroup.LayoutParams.FILL_PARENT)); innerLayout2.setId(ITEM_DETAILS_ID); { FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction(); fragmentTransaction.add(ITEM_DETAILS_ID, new ItemDetails()); fragmentTransaction.commit(); } layout.addView(innerLayout2); return layout; }
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What you are missing is a LayoutInflator. See this example from the action:

 private void createPolicyTable() { if (customerInfo.getPolicies() == null || customerInfo.getPolicies().isEmpty()) { Log.v(TAG, "no policies were found."); return; } LinearLayout policyTable = (LinearLayout)findViewById(R.id.manage_my_policy_policy_table); LayoutInflater inflater = getLayoutInflater(); for(int i = 0; i < customerInfo.getPolicies().size(); i++) { Policy policy = customerInfo.getPolicies().get(i); LinearLayout row = (LinearLayout)inflater.inflate(R.layout.policy_table_row, null); ImageView type = (ImageView)row.findViewById(R.id.policy_table_row_type); if (policy instanceof PersonalVehiclePolicy) { type.setImageResource(R.drawable.auto_policy); } else if (policy instanceof HomeownersPolicy) { type.setImageResource(R.drawable.home_policy); } ((TextView)row.findViewById(R.id.policy_table_row_policy_number)).setText(policy.getPolicyNumber()); ((TextView)row.findViewById(R.id.policy_table_row_amount_due)).setText(policy.getAmountDue()); ((TextView)row.findViewById(R.id.policy_table_row_due_date)).setText(policy.getDueDate()); row.setOnClickListener(createPolicyDetailsOnClickListener(policy)); policyTable.addView(row); } }

and bloated layout:

 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" style="@style/ListItem"> <TableLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:stretchColumns="*"> <TableRow android:layout_width="fill_parent" android:layout_height="wrap_content" android:paddingBottom="5dp"> <TextView android:text="@string/type_label" style="@style/RowLabel" /> <ImageView android:id="@+id/policy_table_row_type" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <TextView style="@style/RowLabel" android:text="@string/policy_num_label" android:paddingRight="5dp" /> <TextView android:id="@+id/policy_table_row_policy_number" style="@style/DefaultText" /> </TableRow> <TableRow android:layout_width="fill_parent" android:layout_height="wrap_content" android:paddingBottom="5dp"> <TextView style="@style/RowLabel" android:text="@string/due_label" android:paddingRight="5dp" /> <TextView android:id="@+id/policy_table_row_amount_due" style="@style/DefaultText" android:paddingRight="5dp" /> <TextView style="@style/RowLabel" android:text="@string/on_lc" android:paddingRight="5dp" /> <TextView android:id="@+id/policy_table_row_due_date" style="@style/DefaultText" /> </TableRow> </TableLayout> </LinearLayout>
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