Example usage for android.app Instrumentation addMonitor

Introduction

In this page you can find the example usage for android.app Instrumentation addMonitor.

Prototype

public void addMonitor(ActivityMonitor monitor) 

Source Link

Document

Add a new ActivityMonitor that will be checked whenever an activity is started.

Usage

From source file:android.arch.lifecycle.TestUtils.java

@SuppressWarnings("unchecked")
static <T extends Activity> T recreateActivity(final T activity, ActivityTestRule rule) throws Throwable {
    ActivityMonitor monitor = new ActivityMonitor(activity.getClass().getCanonicalName(), null, false);
    Instrumentation instrumentation = InstrumentationRegistry.getInstrumentation();
    instrumentation.addMonitor(monitor);
    rule.runOnUiThread(activity::recreate);
    T result;//from w  w w .j a va2s. co m

    // this guarantee that we will reinstall monitor between notifications about onDestroy
    // and onCreate
    //noinspection SynchronizationOnLocalVariableOrMethodParameter
    synchronized (monitor) {
        do {
            // the documetation says "Block until an Activity is created
            // that matches this monitor." This statement is true, but there are some other
            // true statements like: "Block until an Activity is destoyed" or
            // "Block until an Activity is resumed"...

            // this call will release synchronization monitor's monitor
            result = (T) monitor.waitForActivityWithTimeout(TIMEOUT_MS);
            if (result == null) {
                throw new RuntimeException("Timeout. Failed to recreate an activity");
            }
        } while (result == activity);
    }
    return result;
}

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