Android example source code file (RequestFocusTest.java)

This example Android source code file (RequestFocusTest.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, androidruntimeexception, button, calledfromwrongthreadexception, exception, handler, interruptedexception, largetest, mediumtest, os, override, requestfocustest, runnable, test, ui, util, utilities

The RequestFocusTest.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.widget.focus.RequestFocus;
import com.android.frameworks.coretests.R;

import android.os.Handler;
import android.test.ActivityInstrumentationTestCase;
import android.test.suitebuilder.annotation.LargeTest;
import android.test.suitebuilder.annotation.MediumTest;
import android.widget.Button;
import android.util.AndroidRuntimeException;

/**
 * {@link RequestFocusTest} is set up to exercise cases where the views that
 * have focus become invisible or GONE.
 */
public class RequestFocusTest extends ActivityInstrumentationTestCase<RequestFocus> {

    private Button mTopLeftButton;
    private Button mBottomLeftButton;
    private Button mTopRightButton;
    private Button mBottomRightButton;
    private Handler mHandler;

    public RequestFocusTest() {
        super("com.android.frameworks.coretests", RequestFocus.class);
    }

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

        final RequestFocus a = getActivity();
        mHandler = a.getHandler();
        mTopLeftButton = (Button) a.findViewById(R.id.topLeftButton);
        mBottomLeftButton = (Button) a.findViewById(R.id.bottomLeftButton);
        mTopRightButton = (Button) a.findViewById(R.id.topRightButton);
        mBottomRightButton = (Button) a.findViewById(R.id.bottomRightButton);
    }

    // Test that setUp did what we expect it to do.  These asserts
    // can't go in SetUp, or the test will hang.
    @MediumTest
    public void testSetUpConditions() throws Exception {
        assertNotNull(mHandler);
        assertNotNull(mTopLeftButton);
        assertNotNull(mTopRightButton);
        assertNotNull(mBottomLeftButton);
        assertNotNull(mBottomRightButton);
        assertTrue("requestFocus() should work from onCreate.", mBottomRightButton.hasFocus());
    }

    // Test that a posted requestFocus works.
    @LargeTest
    public void testPostedRequestFocus() throws Exception {
        mHandler.post(new Runnable() { public void run() {
            mBottomLeftButton.requestFocus();
        }});
        synchronized(this) {
            try {
                wait(500);
            } catch (InterruptedException e) {
                // Don't care.
            }
        }
        assertTrue("Focus should move to bottom left", mBottomLeftButton.hasFocus());
    }

    // Test that a requestFocus from the wrong thread fails.
    @MediumTest
    public void testWrongThreadRequestFocusFails() throws Exception {
        try {
            mTopRightButton.requestFocus();
            fail("requestFocus from wrong thread should raise exception.");
        } catch (AndroidRuntimeException e) {
            // Expected.  The actual exception is not public, so we can't catch it.
            assertEquals("android.view.ViewRoot$CalledFromWrongThreadException",
                         e.getClass().getName());
        }
    }
}