Android example source code file (ViewGroupChildrenTest.java)

This example Android source code file (ViewGroupChildrenTest.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

activityinstrumentationtestcase, android, exception, mediumtest, override, test, textview, ui, uithreadtest, view, viewgroup, viewgroupchildrentest, widget

The ViewGroupChildrenTest.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.view;

import com.android.frameworks.coretests.R;
import android.view.ViewGroupChildren;

import android.test.ActivityInstrumentationTestCase;
import android.test.suitebuilder.annotation.MediumTest;
import android.test.ViewAsserts;
import android.test.UiThreadTest;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;

/**
 * Exercises {@link android.view.ViewGroup}'s ability to add/remove children.
 */
public class ViewGroupChildrenTest extends ActivityInstrumentationTestCase<ViewGroupChildren> {
    private ViewGroup mGroup;

    public ViewGroupChildrenTest() {
        super("com.android.frameworks.coretests", ViewGroupChildren.class);
    }

    @Override
    public void setUp() throws Exception {
        super.setUp();

        final ViewGroupChildren a = getActivity();
        mGroup = (ViewGroup) a.findViewById(R.id.group);
    }

    @MediumTest
    public void testSetUpConditions() throws Exception {
        assertNotNull(mGroup);
    }

    @MediumTest
    public void testStartsEmpty() throws Exception {
        assertEquals("A ViewGroup should have no child by default", 0, mGroup.getChildCount());
    }

    @UiThreadTest
    @MediumTest
    public void testAddChild() throws Exception {
        View view = createView("1");
        mGroup.addView(view);

        assertEquals(1, mGroup.getChildCount());
        ViewAsserts.assertGroupIntegrity(mGroup);
        ViewAsserts.assertGroupContains(mGroup, view);
    }

    @UiThreadTest
    @MediumTest
    public void testAddChildAtFront() throws Exception {
        // 24 should be greater than ViewGroup.ARRAY_CAPACITY_INCREMENT
        for (int i = 0; i < 24; i++) {
            View view = createView(String.valueOf(i + 1));
            mGroup.addView(view);
        }

        View view = createView("X");
        mGroup.addView(view, 0);

        assertEquals(25, mGroup.getChildCount());
        ViewAsserts.assertGroupIntegrity(mGroup);
        ViewAsserts.assertGroupContains(mGroup, view);
        assertSame(view, mGroup.getChildAt(0));
    }

    @UiThreadTest
    @MediumTest
    public void testAddChildInMiddle() throws Exception {
        // 24 should be greater than ViewGroup.ARRAY_CAPACITY_INCREMENT
        for (int i = 0; i < 24; i++) {
            View view = createView(String.valueOf(i + 1));
            mGroup.addView(view);
        }

        View view = createView("X");
        mGroup.addView(view, 12);

        assertEquals(25, mGroup.getChildCount());
        ViewAsserts.assertGroupIntegrity(mGroup);
        ViewAsserts.assertGroupContains(mGroup, view);
        assertSame(view, mGroup.getChildAt(12));
    }

    @UiThreadTest
    @MediumTest
    public void testAddChildren() throws Exception {
        // 24 should be greater than ViewGroup.ARRAY_CAPACITY_INCREMENT
        for (int i = 0; i < 24; i++) {
            View view = createView(String.valueOf(i + 1));
            mGroup.addView(view);

            ViewAsserts.assertGroupContains(mGroup, view);
        }
        assertEquals(24, mGroup.getChildCount());
    }

    @UiThreadTest
    @MediumTest
    public void testRemoveChild() throws Exception {
        View view = createView("1");
        mGroup.addView(view);

        ViewAsserts.assertGroupIntegrity(mGroup);

        mGroup.removeView(view);

        ViewAsserts.assertGroupIntegrity(mGroup);
        ViewAsserts.assertGroupNotContains(mGroup, view);

        assertEquals(0, mGroup.getChildCount());
        assertNull(view.getParent());
    }

    @UiThreadTest
    @MediumTest
    public void testRemoveChildren() throws Exception {
        // 24 should be greater than ViewGroup.ARRAY_CAPACITY_INCREMENT
        final View[] views = new View[24];

        for (int i = 0; i < views.length; i++) {
            views[i] = createView(String.valueOf(i + 1));
            mGroup.addView(views[i]);
        }

        for (int i = views.length - 1; i >= 0; i--) {
            mGroup.removeViewAt(i);
            ViewAsserts.assertGroupIntegrity(mGroup);
            ViewAsserts.assertGroupNotContains(mGroup, views[i]);
            assertNull(views[i].getParent());
        }

        assertEquals(0, mGroup.getChildCount());
    }

    @UiThreadTest
    @MediumTest
    public void testRemoveChildrenBulk() throws Exception {
        // 24 should be greater than ViewGroup.ARRAY_CAPACITY_INCREMENT
        final View[] views = new View[24];

        for (int i = 0; i < views.length; i++) {
            views[i] = createView(String.valueOf(i + 1));
            mGroup.addView(views[i]);
        }

        mGroup.removeViews(6, 7);
        ViewAsserts.assertGroupIntegrity(mGroup);
        for (int i = 6; i < 13; i++) {
            ViewAsserts.assertGroupNotContains(mGroup, views[i]);
            assertNull(views[i].getParent());
        }

        assertEquals(17, mGroup.getChildCount());
    }

    @UiThreadTest
    @MediumTest
    public void testRemoveChildrenBulkAtFront() throws Exception {
        // 24 should be greater than ViewGroup.ARRAY_CAPACITY_INCREMENT
        final View[] views = new View[24];

        for (int i = 0; i < views.length; i++) {
            views[i] = createView(String.valueOf(i + 1));
            mGroup.addView(views[i]);
        }

        mGroup.removeViews(0, 7);
        ViewAsserts.assertGroupIntegrity(mGroup);
        for (int i = 0; i < 7; i++) {
            ViewAsserts.assertGroupNotContains(mGroup, views[i]);
            assertNull(views[i].getParent());
        }

        assertEquals("8", ((TextView) mGroup.getChildAt(0)).getText());
        assertEquals(17, mGroup.getChildCount());
    }

    @UiThreadTest
    @MediumTest
    public void testRemoveChildrenBulkAtEnd() throws Exception {
        // 24 should be greater than ViewGroup.ARRAY_CAPACITY_INCREMENT
        final View[] views = new View[24];

        for (int i = 0; i < views.length; i++) {
            views[i] = createView(String.valueOf(i + 1));
            mGroup.addView(views[i]);
        }

        mGroup.removeViews(17, 7);
        ViewAsserts.assertGroupIntegrity(mGroup);
        for (int i = 17; i < 24; i++) {
            ViewAsserts.assertGroupNotContains(mGroup, views[i]);
            assertNull(views[i].getParent());
        }
        assertEquals("17", ((TextView) mGroup.getChildAt(mGroup.getChildCount() - 1)).getText());
        assertEquals(17, mGroup.getChildCount());
    }

    @UiThreadTest
    @MediumTest
    public void testRemoveChildAtFront() throws Exception {
        // 24 should be greater than ViewGroup.ARRAY_CAPACITY_INCREMENT
        final View[] views = new View[24];

        for (int i = 0; i < views.length; i++) {
            views[i] = createView(String.valueOf(i + 1));
            mGroup.addView(views[i]);
        }

        mGroup.removeViewAt(0);
        ViewAsserts.assertGroupIntegrity(mGroup);
        ViewAsserts.assertGroupNotContains(mGroup, views[0]);
        assertNull(views[0].getParent());

        assertEquals(views.length - 1, mGroup.getChildCount());
    }

    @UiThreadTest
    @MediumTest
    public void testRemoveChildInMiddle() throws Exception {
        // 24 should be greater than ViewGroup.ARRAY_CAPACITY_INCREMENT
        final View[] views = new View[24];

        for (int i = 0; i < views.length; i++) {
            views[i] = createView(String.valueOf(i + 1));
            mGroup.addView(views[i]);
        }

        mGroup.removeViewAt(12);
        ViewAsserts.assertGroupIntegrity(mGroup);
        ViewAsserts.assertGroupNotContains(mGroup, views[12]);
        assertNull(views[12].getParent());

        assertEquals(views.length - 1, mGroup.getChildCount());        
    }

    private TextView createView(String text) {
        TextView view = new TextView(getActivity());
        view.setText(text);
        view.setLayoutParams(new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.MATCH_PARENT,
                LinearLayout.LayoutParams.WRAP_CONTENT
        ));
        return view;
    }
}