Android example source code file (ListUtil.java)

This example Android source code file (ListUtil.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

android, app, application, illegalstateexception, instrumentation, listutil, listview, runnable, ui, view, widget

The ListUtil.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.util;

import android.app.Instrumentation;
import android.view.KeyEvent;
import android.widget.ListView;


/**
 * Various useful stuff for instrumentation testing listview.
 */
public class ListUtil {


    private final ListView mListView;
    private final Instrumentation mInstrumentation;

    /**
     * @param listView The listview to act on
     * @param instrumentation The instrumentation to use.
     */
    public ListUtil(ListView listView, Instrumentation instrumentation) {
        mListView = listView;
        mInstrumentation = instrumentation;
    }

    /**
     * Set the selected position of the list view.
     * @param pos The desired position.
     */
    public final void setSelectedPosition(final int pos) {
        mListView.post(new Runnable() {
            public void run() {
                mListView.setSelection(pos);
            }
        });
        mInstrumentation.waitForIdleSync();
    }

    /**
     * Get the top of the list.
     */
    public final int getListTop() {
        return mListView.getListPaddingTop();
    }

    /**
     * Get the bottom of the list.
     */
    public final int getListBottom() {
        return mListView.getHeight() - mListView.getListPaddingBottom();
    }

    /**
     * Arrow (up or down as appropriate) to the desired position in the list.
     * @param desiredPos The desired position
     * @throws IllegalStateException if the position can't be reached within 20 presses.
     */
    public final void arrowScrollToSelectedPosition(int desiredPos) {
        if (desiredPos > mListView.getSelectedItemPosition()) {
            arrowDownToSelectedPosition(desiredPos);
        } else {
            arrowUpToSelectedPosition(desiredPos);
        }
    }

    private void arrowDownToSelectedPosition(int position) {
        int maxDowns = 20;
        while(mListView.getSelectedItemPosition() < position && --maxDowns > 0) {
            mInstrumentation.sendCharacterSync(KeyEvent.KEYCODE_DPAD_DOWN);
        }
        if (position != mListView.getSelectedItemPosition()) {
            throw new IllegalStateException("couldn't get to item after 20 downs");
        }

    }

    private void arrowUpToSelectedPosition(int position) {
        int maxUps = 20;
        while(mListView.getSelectedItemPosition() > position && --maxUps > 0) {
            mInstrumentation.sendCharacterSync(KeyEvent.KEYCODE_DPAD_UP);
        }
        if (position != mListView.getSelectedItemPosition()) {
            throw new IllegalStateException("couldn't get to item after 20 ups");
        }
    }

}