The file containing the source code shown below is located in the corresponding directory in <sdk>/samples/android-<version>/...
/*
* Copyright (C) 2010 The Android开源工程
*
* 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 com.android.example.spinner.test;
import com.android.example.spinner.SpinnerActivity;
import android.app.Instrumentation;
import android.test.ActivityInstrumentationTestCase2;
import android.test.UiThreadTest;
import android.view.KeyEvent;
import android.widget.Spinner;
import android.widget.SpinnerAdapter;
import android.widget.TextView;
/*
* Tests the example application Spinner. Uses the instrumentation test class
* ActivityInstrumentationTestCase2 as its base class. The tests include
* - test initial conditions
* - test the UI
* - state management - preserving state after the app is shut down and restarted, preserving
* state after the app is hidden (paused) and re-displayed (resumed)
*
* Demonstrates the use of JUnit setUp() and assert() methods.
*/
public class SpinnerActivityTest extends ActivityInstrumentationTestCase2<SpinnerActivity> {
// Number of items in the spinner's backing mLocalAdapter
public static final int ADAPTER_COUNT = 9;
// The location of Saturn in the backing mLocalAdapter array (0-based)
public static final int TEST_POSITION = 5;
// Set the initial position of the spinner to zero
public static final int INITIAL_POSITION = 0;
// The initial position corresponds to Mercury
public static final String INITIAL_SELECTION = "Mercury";
// Test values of position and selection for the testStateDestroy test
public static final int TEST_STATE_DESTROY_POSITION = 2;
public static final String TEST_STATE_DESTROY_SELECTION = "Earth";
// Test values of position and selection for the testStatePause test
public static final int TEST_STATE_PAUSE_POSITION = 4;
public static final String TEST_STATE_PAUSE_SELECTION = "Jupiter";
// The Application object for the application under test
private SpinnerActivity mActivity;
// String displayed in the spinner in the app under test
private String mSelection;
// The currently selected position in the spinner in the app under test
private int mPos;
/*
* The Spinner object in the app under test. Used with instrumentation to control the
* app under test.
*/
private Spinner mSpinner;
/*
* The data backing the Spinner in the app under test.
*/
private SpinnerAdapter mPlanetData;
/*
* Constructor for the test class. Required by Android test classes. The constructor
* must call the super constructor, providing the Android package name of the app under test
* and the Java class name of the activity in that application that handles the MAIN intent.
*/
public SpinnerActivityTest() {
super("com.android.example.spinner", SpinnerActivity.class);
}
/*
* Sets up the test environment before each test.
* @see android.test.ActivityInstrumentationTestCase2#setUp()
*/
@Override
protected void setUp() throws Exception {
/*
* Call the super constructor (required by JUnit)
*/
super.setUp();
/*
* prepare to send key events to the app under test by turning off touch mode.
* Must be done before the first call to getActivity()
*/
setActivityInitialTouchMode(false);
/*
* Start the app under test by starting its main activity. The test runner already knows
* which activity this is from the call to the super constructor, as mentioned
* previously. The tests can now use instrumentation to directly access the main
* activity through mActivity.
*/
mActivity = getActivity();
/*
* Get references to objects in the application under test. These are
* tested to ensure that the app under test has initialized correctly.
*/
mSpinner = (Spinner)mActivity.findViewById(com.android.example.spinner.R.id.Spinner01);
mPlanetData = mSpinner.getAdapter();
}
/*
* Tests the initial values of key objects in the app under test, to ensure the initial
* conditions make sense. If one of these is not initialized correctly, then subsequent
* tests are suspect and should be ignored.
*/
public void testPreconditions() {
/*
* An example of an initialization test. Assert that the item select listener in
* the main Activity is not null (has been set to a valid callback)
*/
assertTrue(mSpinner.getOnItemSelectedListener() != null);
/*
* Test that the spinner's backing mLocalAdapter was initialized correctly.
*/
assertTrue(mPlanetData != null);
/*
* Also ensure that the backing mLocalAdapter has the correct number of entries.
*/
assertEquals(mPlanetData.getCount(), ADAPTER_COUNT);
}
/*
* Tests the UI of the main activity. Sends key events (keystrokes) to the UI, then checks
* if the resulting spinner state is consistent with the attempted selection.
*/
public void testSpinnerUI() {
/*
* Request focus for the spinner widget in the application under test,
* and set its initial position. This code interacts with the app's View
* so it has to run on the app's thread not the test's thread.
*
* To do this, pass the necessary code to the application with
* runOnUiThread(). The parameter is an anonymous Runnable object that
* contains the Java statements put in it by its run() method.
*/
mActivity.runOnUiThread(
new Runnable() {
public void run() {
mSpinner.requestFocus();
mSpinner.setSelection(INITIAL_POSITION);
}
}
);
// Activate the spinner by clicking the center keypad key
this.sendKeys(KeyEvent.KEYCODE_DPAD_CENTER);
// send 5 down arrow keys to the spinner
for (int i = 1; i <= TEST_POSITION; i++) {
this.sendKeys(KeyEvent.KEYCODE_DPAD_DOWN);
}
// select the item at the current spinner position
this.sendKeys(KeyEvent.KEYCODE_DPAD_CENTER);
// get the position of the selected item
mPos = mSpinner.getSelectedItemPosition();
/*
* from the spinner's data mLocalAdapter, get the object at the selected position
* (this is a String value)
*/
mSelection = (String)mSpinner.getItemAtPosition(mPos);
/*
* Get the TextView widget that displays the result of selecting an item from the spinner
*/
TextView resultView =
(TextView) mActivity.findViewById(com.android.example.spinner.R.id.SpinnerResult);
// Get the String value in the EditText object
String resultText = (String) resultView.getText();
/*
* Confirm that the EditText contains the same value as the data in the mLocalAdapter
*/
assertEquals(resultText,mSelection);
}
/*
* Tests that the activity under test maintains the spinner state when the activity halts
* and then restarts (for example, if the device reboots). Sets the spinner to a
* certain state, calls finish() on the activity, restarts the activity, and then
* checks that the spinner has the same state.
*
*/
public void testStateDestroy() {
/*
* Set the position and value of the spinner in the Activity. The test runner's
* instrumentation enables this by running the test app and the main app in the same
* process.
*/
mActivity.setSpinnerPosition(TEST_STATE_DESTROY_POSITION);
mActivity.setSpinnerSelection(TEST_STATE_DESTROY_SELECTION);
// Halt the Activity by calling Activity.finish() on it
mActivity.finish();
// Restart the activity by calling ActivityInstrumentationTestCase2.getActivity()
mActivity = this.getActivity();
/*
* Get the current position and selection from the activity.
*/
int currentPosition = mActivity.getSpinnerPosition();
String currentSelection = mActivity.getSpinnerSelection();
// test that they are the same.
assertEquals(TEST_STATE_DESTROY_POSITION, currentPosition);
assertEquals(TEST_STATE_DESTROY_SELECTION, currentSelection);
}
/*
* Tests that the activity under test maintains the spinner's state when the activity is
* paused and then resumed.
*
* Calls the activity's onResume() method. Changes the spinner's state by
* altering the activity's View. This means the test must run
* on the UI Thread. All the statements in the test method may be run on
* that thread, so instead of using the runOnUiThread() method, the
* @UiThreadTest is used.
*/
@UiThreadTest
public void testStatePause() {
/*
* Get the instrumentation object for this application. This object
* does all the instrumentation work for the test runner
*/
Instrumentation instr = this.getInstrumentation();
/*
* Set the activity's fields for the position and value of the spinner
*/
mActivity.setSpinnerPosition(TEST_STATE_PAUSE_POSITION);
mActivity.setSpinnerSelection(TEST_STATE_PAUSE_SELECTION);
/*
* Use the instrumentation to onPause() on the currently running Activity.
* This analogous to calling finish() in the testStateDestroy() method.
* This way demonstrates using the test class' instrumentation.
*/
instr.callActivityOnPause(mActivity);
/*
* Set the spinner to a test position
*/
mActivity.setSpinnerPosition(0);
mActivity.setSpinnerSelection("");
/*
* Call the activity's onResume() method. This forces the activity
* to restore its state.
*/
instr.callActivityOnResume(mActivity);
/*
* Get the current state of the spinner
*/
int currentPosition = mActivity.getSpinnerPosition();
String currentSelection = mActivity.getSpinnerSelection();
assertEquals(TEST_STATE_PAUSE_POSITION,currentPosition);
assertEquals(TEST_STATE_PAUSE_SELECTION,currentSelection);
}
}