Android example source code file (VerticalFocusSearch.java)

This example Android source code file (VerticalFocusSearch.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

activity, android, button, content, linearlayout, mybutton, os, override, string, textview, ui, verticalfocussearch, view, widget

The VerticalFocusSearch.java Android example source code

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.widget.focus;

import android.app.Activity;
import android.os.Bundle;
import android.widget.LinearLayout;
import android.widget.Button;
import android.widget.TextView;
import android.view.Gravity;
import android.view.ViewGroup;
import android.content.Context;

/**
 * Holds a few buttons of various sizes and horizontal placements in a
 * vertical layout to excercise some core focus searching.
 */
public class VerticalFocusSearch extends Activity {

    private LinearLayout mLayout;

    private Button mTopWide;
    private Button mMidSkinny1Left;
    private Button mBottomWide;

    private Button mMidSkinny2Right;


    public LinearLayout getLayout() {
        return mLayout;
    }

    public Button getTopWide() {
        return mTopWide;
    }

    public Button getMidSkinny1Left() {
        return mMidSkinny1Left;
    }

    public Button getMidSkinny2Right() {
        return mMidSkinny2Right;
    }

    public Button getBottomWide() {
        return mBottomWide;
    }

    @Override
    protected void onCreate(Bundle icicle) {
        super.onCreate(icicle);

        mLayout = new LinearLayout(this);
        mLayout.setOrientation(LinearLayout.VERTICAL);
        mLayout.setHorizontalGravity(Gravity.LEFT);
        mLayout.setLayoutParams(new ViewGroup.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT));

        mTopWide = makeWide("top wide");
        mLayout.addView(mTopWide);

        mMidSkinny1Left = addSkinny(mLayout, "mid skinny 1(L)", false);

        mMidSkinny2Right = addSkinny(mLayout, "mid skinny 2(R)", true);

        mBottomWide = makeWide("bottom wide");
        mLayout.addView(mBottomWide);

        setContentView(mLayout);
    }

    // just to get toString non-sucky
    private static class MyButton extends Button {

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


        @Override
        public String toString() {
            return getText().toString();
        }
    }

    private Button makeWide(String label) {
        Button button = new MyButton(this);
        button.setText(label);
        button.setLayoutParams(new LinearLayout.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.WRAP_CONTENT));
        return button;
    }

    /**
     * Add a skinny button that takes up just less than half of the screen
     * horizontally.
     * @param root The layout to add the button to.
     * @param label The label of the button.
     * @param atRight Which side to put the button on.
     * @return The newly created button.
     */
    private Button addSkinny(LinearLayout root, String label, boolean atRight) {
        Button button = new MyButton(this);
        button.setText(label);
        button.setLayoutParams(new LinearLayout.LayoutParams(
                0, // width
                ViewGroup.LayoutParams.WRAP_CONTENT,
                480));

        TextView filler = new TextView(this);
        filler.setText("filler");
        filler.setLayoutParams(new LinearLayout.LayoutParams(
                0, // width
                ViewGroup.LayoutParams.WRAP_CONTENT,
                520));

        LinearLayout ll = new LinearLayout(this);
        ll.setOrientation(LinearLayout.HORIZONTAL);
        ll.setLayoutParams(new LinearLayout.LayoutParams(
            ViewGroup.LayoutParams.MATCH_PARENT,
            ViewGroup.LayoutParams.WRAP_CONTENT));

        if (atRight) {
            ll.addView(filler);
            ll.addView(button);
            root.addView(ll);
        } else {
            ll.addView(button);
            ll.addView(filler);
            root.addView(ll);
        }
        return button;
    }

}