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/*
* Copyright (C) 2014 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 com.google.android.apps.common.testing.ui.espresso.base;
import static com.google.common.base.Preconditions.checkState;
import com.google.android.apps.common.testing.ui.espresso.Root;
import com.google.common.collect.Lists;
import android.os.Build;
import android.os.Looper;
import android.util.Log;
import android.view.View;
import android.view.WindowManager.LayoutParams;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.List;
import javax.inject.Inject;
import javax.inject.Provider;
import javax.inject.Singleton;
/**
* Provides access to all root views in an application.
*
* 95% of the time this is unnecessary and we can operate solely on current Activity's root view
* as indicated by getWindow().getDecorView(). However in the case of popup windows, menus, and
* dialogs the actual view hierarchy we should be operating on is not accessible thru public apis.
*
* In the spirit of degrading gracefully when new api levels break compatibility, callers should
* handle a list of size 0 by assuming getWindow().getDecorView() on the currently resumed activity
* is the sole root - this assumption will be correct often enough.
*
* Obviously, you need to be on the main thread to use this.
*/
@Singleton
final class RootsOracle implements Provider<List<Root>> {
private static final String TAG = RootsOracle.class.getSimpleName();
private static final String WINDOW_MANAGER_IMPL_CLAZZ =
"android.view.WindowManagerImpl";
private static final String WINDOW_MANAGER_GLOBAL_CLAZZ =
"android.view.WindowManagerGlobal";
private static final String VIEWS_FIELD = "mViews";
private static final String WINDOW_PARAMS_FIELD = "mParams";
private static final String GET_DEFAULT_IMPL = "getDefault";
private static final String GET_GLOBAL_INSTANCE = "getInstance";
private final Looper mainLooper;
private boolean initialized;
private Object windowManagerObj;
private Field viewsField;
private Field paramsField;
@Inject
RootsOracle(Looper mainLooper) {
this.mainLooper = mainLooper;
}
@SuppressWarnings("unchecked")
@Override
public List<Root> get() {
checkState(mainLooper.equals(Looper.myLooper()), "must be called on main thread.");
if (!initialized) {
initialize();
}
if (null == windowManagerObj) {
Log.w(TAG, "No reflective access to windowmanager object.");
return Lists.newArrayList();
}
if (null == viewsField) {
Log.w(TAG, "No reflective access to mViews");
return Lists.newArrayList();
}
if (null == paramsField) {
Log.w(TAG, "No reflective access to mPArams");
return Lists.newArrayList();
}
List<View> views = null;
List<LayoutParams> params = null;
try {
if (Build.VERSION.SDK_INT < 19) {
views = Arrays.asList((View[]) viewsField.get(windowManagerObj));
params = Arrays.asList((LayoutParams[]) paramsField.get(windowManagerObj));
} else {
views = (List<View>) viewsField.get(windowManagerObj);
params = (List<LayoutParams>) paramsField.get(windowManagerObj);
}
} catch (RuntimeException re) {
Log.w(TAG, String.format("Reflective access to %s or %s on %s failed.",
viewsField, paramsField, windowManagerObj), re);
return Lists.newArrayList();
} catch (IllegalAccessException iae) {
Log.w(TAG, String.format("Reflective access to %s or %s on %s failed.",
viewsField, paramsField, windowManagerObj), iae);
return Lists.newArrayList();
}
List<Root> roots = Lists.newArrayList();
for (int i = views.size() - 1; i > -1; i--) {
roots.add(
new Root.Builder()
.withDecorView(views.get(i))
.withWindowLayoutParams(params.get(i))
.build());
}
return roots;
}
private void initialize() {
initialized = true;
String accessClass = Build.VERSION.SDK_INT > 16 ? WINDOW_MANAGER_GLOBAL_CLAZZ
: WINDOW_MANAGER_IMPL_CLAZZ;
String instanceMethod = Build.VERSION.SDK_INT > 16 ? GET_GLOBAL_INSTANCE : GET_DEFAULT_IMPL;
try {
Class<?> clazz = Class.forName(accessClass);
Method getMethod = clazz.getMethod(instanceMethod);
windowManagerObj = getMethod.invoke(null);
viewsField = clazz.getDeclaredField(VIEWS_FIELD);
viewsField.setAccessible(true);
paramsField = clazz.getDeclaredField(WINDOW_PARAMS_FIELD);
paramsField.setAccessible(true);
} catch (InvocationTargetException ite) {
Log.e(TAG, String.format("could not invoke: %s on %s", instanceMethod, accessClass),
ite.getCause());
} catch (ClassNotFoundException cnfe) {
Log.e(TAG, String.format("could not find class: %s", accessClass), cnfe);
} catch (NoSuchFieldException nsfe) {
Log.e(TAG, String.format("could not find field: %s or %s on %s", WINDOW_PARAMS_FIELD,
VIEWS_FIELD, accessClass), nsfe);
} catch (NoSuchMethodException nsme) {
Log.e(TAG, String.format("could not find method: %s on %s", instanceMethod, accessClass),
nsme);
} catch (RuntimeException re) {
Log.e(TAG, String.format("reflective setup failed using obj: %s method: %s field: %s",
accessClass, instanceMethod, VIEWS_FIELD), re);
} catch (IllegalAccessException iae) {
Log.e(TAG, String.format("reflective setup failed using obj: %s method: %s field: %s",
accessClass, instanceMethod, VIEWS_FIELD), iae);
}
}
}
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