How to set size and layout in onSizeChanged?

Question

I can\'t get my elements, for example ListView, to resize properly.

I got a ListActivity for searching, with a dashboard, an editbox and a

Answer 1

This could be a long shot...

Have you tried playing with the android:layout_height="" setting for the ListView?

Maybe using match_parent or wrap_content could force it to work...

As I said... a long shot!

Answer 2

You can force the ListView to redraw by changing its height by 1px and calling

requestLayout()

Answer 3

Adding the following at the end of onSizeChanged() will solve it:

Handler handler = new Handler();
handler.post(new Runnable() {

    @Override
    public void run() {
        requestLayout();
    }
});

See the answer to this question: Views inside a custom ViewGroup not rendering after a size change

Answer 4

It's possible to do what you want by registering a setOnFocusChangeListener and a setOnClickListener to the EditText.

There are a lot of different scenarios to consider when it comes to navigation and things might need to be changed to work with a certain layout.

Anyway, start by overriding onSizeChanged to show the hidden element when the back button is touched.

public class MyLinearLayout extends LinearLayout {

    private MyListActivity mMyListActivity;

    public MyLinearLayout(Context context) {
        super(context);
    }

    public MyLinearLayout(Context context, AttributeSet attrs) {
        super(context, attrs);      
    }

    public void setMyListActivity(MyListActivity mla) {
        mMyListActivity = mla;
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        // show the element when we get more room       
        if (h > oldh) {
            if (mMyListActivity != null) {
                mMyListActivity.showBar();
            }
        }
        super.onSizeChanged(w, h, oldw, oldh);
    }
}

In the ListActivity we grab the MyLinearLayout and pass this to it. Then a setOnFocusChangeListener is registered to handle things when the EditText's focus changes. The setOnClickListener is used to hide the element when the EditText already has focus.

public class MyListActivity extends ListActivity {

    private ArrayList<MyData> mDataList = new ArrayList<MyData>();

    private MyLinearLayout mMyLinearLayout; 
    private LinearLayout mHideMeLinearLayout;
    private EditText mEditText;

    public void showBar() {
        if (mHideMeLinearLayout != null) {
            mHideMeLinearLayout.setVisibility(View.VISIBLE);
        }
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // Get MyLinearLayout and pass this to it.
        mMyLinearLayout = (MyLinearLayout) findViewById(R.id.myLinearLayout);
        mMyLinearLayout.setMyListActivity(this);

        // the LinearLayout to be hidden
        mHideMeLinearLayout = (LinearLayout) findViewById(R.id.LinearLayoutToHide);

        mEditText = (EditText) findViewById(R.id.editText);     
        mEditText.setOnFocusChangeListener(new OnFocusChangeListener() {
            @Override
            public void onFocusChange(View v, boolean hasFocus) {
                InputMethodManager imm = (InputMethodManager) getSystemService(Service.INPUT_METHOD_SERVICE);
                if (hasFocus) {
                    imm.showSoftInput(mEditText, 0);
                    mHideMeLinearLayout.setVisibility(View.GONE);
                } else {
                    imm.hideSoftInputFromWindow(mMyLinearLayout.getWindowToken(), 0);
                    mHideMeLinearLayout.setVisibility(View.VISIBLE);
                }
            }
        });
        mEditText.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                mHideMeLinearLayout.setVisibility(View.GONE);
            }
        });

        .....
    }

    .....
}

I'll provide a working example later, but gotta run now.