how to use Instrumentation under the uiautomator project?

Question

I'm working on a uiautomator project recently and then the UiObject.getFromParent turn out a wrong element to me and I look into the source code of uiautomator and found out the answer is because by the UiSelector I used.

I found that the uiautomator is using the Instrumentation to get the UI element stuff just like :

getInstrumentation().getUiAutomation().getRootInActiveWindow();

I just want to get a AccessibilityNodeInfo node just like what uiautomator do but the uiautomator didn't exposed this.

I’m trying this way by a new class extends InstrumentationTestCase,by the getInstrumentation() always return a null to me.

i found an answer on android instrumentation test case - getinstrumentation() returning null that needs injectInstrumentation(InstrumentationRegistry.getInstrumentation()); and told InstrumentationRegistry is from the official Android testing-support-lib:0.1

I have download the Android Support Repository and import the testing-support-lib-0.1-source.jar into my project but I still can't see InstrumentationRegistry.

Anyone have any idea about my cast?

Answer 1

Frist tried:

i have noticed that the point of this question is the uiautomator didn't expose the api i want,and when i look into the source and found the UiDevice.dumpWindowHierarchy that has these code:

AccessibilityNodeInfo root =getAutomatorBridge().getQueryController().getAccessibilityRootNode();
 the getAutomatorBridge was implemented by UiDevice:
   UiAutomatorBridge getAutomatorBridge() {
        if (mUiAutomationBridge == null) {
            throw new RuntimeException("UiDevice not initialized");
        }
        return mUiAutomationBridge;
    }

the point is there is no modifier on it,so what i have done is modified it's modifier to public ,modified the byte code of

/system/framework/uiautomator.jar

and the other one in sdk(sorry i don't,ya it worked!i can use it like this.

AccessibilityNodeInfo root =getUidevice().getAutomatorBridge().getQueryController().getAccessibilityRootNode();

but there is a compatibility issue isn't it?

Second tried:

Let's think about the default modifier of java,we can access it under the same package,so why don't we just implement a class has the same Package name ?then we can call it without any unnomal patch. that's what i have done and it really works well:

package com.android.uiautomator.core;

import android.view.Display;
import android.view.accessibility.AccessibilityNodeInfo;

public class AutomationUltilites
{
    public AutomationUltilites()
    {
    }
    public static AccessibilityNodeInfo  getRootNode()
    {
        return UiDevice.getInstance().getAutomatorBridge().getRootInActiveWindow();
    }
    public static Display getDisplay()
    {
        return UiDevice.getInstance().getAutomatorBridge().getDefaultDisplay();
    }
}

Hope it helps.