InputMethodService 的检测测试用例

Question

我已经扩展了InputMethodService类来创建我的自定义 IME。但是，我正在努力编写有效的检测测试用例来验证行为。以前Service，可以使用ServiceTestCase<YourServiceClass>进行测试。但它似乎已被弃用，新格式如下所示。现在在给定的指南中，我正在努力解决这个片段：

CustomKeyboardService service =
((CustomKeyboardService.LocalBinder) binder).getService();

由于我正在扩展InputMethodService，它已经抽象了IBinder，我如何获得LocalBinder来运行这个片段？目前，此代码段引发以下异常：

java.lang.ClassCastException： android.inputmethodservice.IInputMethodWrapper 不能强制转换为 com.osrc.zdar.customkeyboard.CustomKeyboardService$LocalBinder

扩展类如下所示：

public class CustomKeyboardService extends InputMethodService {
// Some keyboard related stuff
public class LocalBinder extends Binder {
public CustomKeyboardService getService() {
// Return this instance of LocalService so clients can call public methods.
return CustomKeyboardService.this;
}
}
// Some keyboard related stuff
}

如何扩展我的自定义类，使CustomKeyboardService service = ((CustomKeyboardService.LocalBinder) binder).getService();不返回错误？

这是我的测试用例代码：

@RunWith(AndroidJUnit4.class)
public class ExampleInstrumentedTest2 {
@Rule
public final ServiceTestRule mServiceRule = new ServiceTestRule();
@Test
public void testWithBoundService() throws TimeoutException {
// Create the service Intent.
Intent serviceIntent =
new Intent(InstrumentationRegistry.getTargetContext(), CustomKeyboardService.class);
// Bind the service and grab a reference to the binder.
IBinder binder = mServiceRule.bindService(serviceIntent);
// Get the reference to the service, or you can call public methods on the binder directly.
//  This Line throws the error
CustomKeyboardService service =
((CustomKeyboardService.LocalBinder) binder).getService();
}
}

您还可以在 Github 上查看 OimeKeyboard 以获取完整的源代码，并提交包含有效检测测试用例的 PR。

Answer 1

同样的问题发生在我身上，请查看以下链接的解决方案。
从链接更新的代码片段：

@Rule
public final ServiceTestRule mServiceRule = new ServiceTestRule();
private MyKeyboard retrieveMyKeyboardInstance(IBinder binder) {
try {
Class wrapperClass = Class.forName("android.inputmethodservice.IInputMethodWrapper");
Field mTargetField = wrapperClass.getDeclaredField("mTarget");
mTargetField.setAccessible(true);
WeakReference<MyKeyboard> weakReference = (WeakReference<MyKeyboard>) mTargetField.get(binder);
return weakReference.get();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public void validateEditTextWithKeyboardInput() throws TimeoutException {
...
Intent serviceIntent = new Intent(InstrumentationRegistry.getTargetContext(), MyKeyboard.class);
IBinder binder = mServiceRule.bindService(serviceIntent);
MyKeyboard keyboard = retrieveMyKeyboardInstance(binder);
...
}

来自 ： https://github.com/sealor/prototype-Android-Espresso-Keyboard-Testing