Android example source code file (PositionTesterContextMenuListener.java)

This example Android source code file (PositionTesterContextMenuListener.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

adapter_type, adaptercontextmenuinfo, android, expandablelistcontextmenuinfo, oncreatecontextmenulistener, positiontestercontextmenulistener, string, ui, view, widget, wrong

The PositionTesterContextMenuListener.java Android example source code

/*
 * Copyright (C) 2010 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.expandablelistview;

import android.view.ContextMenu;
import android.view.View;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.View.OnCreateContextMenuListener;
import android.widget.ExpandableListView;
import android.widget.AdapterView.AdapterContextMenuInfo;

public class PositionTesterContextMenuListener implements OnCreateContextMenuListener {

    private int groupPosition, childPosition;

    // Fake constant to store in testType a test type specific to headers and footers
    private static final int ADAPTER_TYPE = -1;
    private int testType; // as returned by getPackedPositionType

    // Will be set to null by each call to onCreateContextMenu, unless an error occurred. 
    private String errorMessage;

    public void expectGroupContextMenu(int groupPosition) {
        this.groupPosition = groupPosition;
        testType = ExpandableListView.PACKED_POSITION_TYPE_GROUP;
    }

    public void expectChildContextMenu(int groupPosition, int childPosition) {
        this.groupPosition = groupPosition;
        this.childPosition = childPosition;
        testType = ExpandableListView.PACKED_POSITION_TYPE_CHILD;
    }

    public void expectAdapterContextMenu(int flatPosition) {
        this.groupPosition = flatPosition;
        testType = ADAPTER_TYPE;
    }

    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
        errorMessage = null;
        if (testType == ADAPTER_TYPE) {
            if (!isTrue("MenuInfo is not an AdapterContextMenuInfo",
                    menuInfo instanceof AdapterContextMenuInfo)) {
                return;
            }
            AdapterContextMenuInfo adapterContextMenuInfo = (AdapterContextMenuInfo) menuInfo;
            if (!areEqual("Wrong flat position", groupPosition, adapterContextMenuInfo.position)) {
                return;
            }
        } else {
            if (!isTrue("MenuInfo is not an ExpandableListContextMenuInfo",
                    menuInfo instanceof ExpandableListView.ExpandableListContextMenuInfo)) {
                return;
            }
            ExpandableListView.ExpandableListContextMenuInfo elvMenuInfo =
                (ExpandableListView.ExpandableListContextMenuInfo) menuInfo;
            long packedPosition = elvMenuInfo.packedPosition;

            int packedPositionType = ExpandableListView.getPackedPositionType(packedPosition);
            if (!areEqual("Wrong packed position type", testType, packedPositionType)) {
                return;
            }

            int packedPositionGroup = ExpandableListView.getPackedPositionGroup(packedPosition);
            if (!areEqual("Wrong group position", groupPosition, packedPositionGroup)) {
                return;
            }

            if (testType == ExpandableListView.PACKED_POSITION_TYPE_CHILD) {
                int packedPositionChild = ExpandableListView.getPackedPositionChild(packedPosition);
                if (!areEqual("Wrong child position", childPosition, packedPositionChild)) {
                    return;
                }
            }
        }
    }

    private boolean areEqual(String message, int expected, int actual) {
        if (expected != actual) {
            errorMessage = String.format(message + " (%d vs %d", expected, actual);
            return false;
        }
        return true;
    }

    private boolean isTrue(String message, boolean value) {
        if (!value) {
            errorMessage = message;
            return false;
        }
        return true;
    }

    public String getErrorMessage() {
        return errorMessage;
    }
}