android testing （三）————关于Android(安卓)test 中涉及多个Activity的问题

package com.mycompany;

import android.app.*;
import android.content.*;
import android.test.*;
import android.test.suitebuilder.annotation.*;
import android.util.*;
import android.view.*;
import android.widget.*;

import static org.hamcrest.core.Is.*;
import static org.hamcrest.core.IsNull.*;
import static org.hamcrest.core.IsInstanceOf.instanceOf;
import static org.junit.Assert.*;
import static com.mycompany.R.id.*;

public class LoginTests extends InstrumentationTestCase {

   @MediumTest
   public void testAValidUserCanLogIn() {

      Instrumentation instrumentation = getInstrumentation();

      // Register we are interested in the authentication activiry...
      Instrumentation.ActivityMonitor monitor = instrumentation.addMonitor(AuthenticateActivity.class.getName(), null, false);

      // Start the authentication activity as the first activity...
      Intent intent = new Intent(Intent.ACTION_MAIN);
      intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
      intent.setClassName(instrumentation.getTargetContext(), AuthenticateActivity.class.getName());
      instrumentation.startActivitySync(intent);

      // Wait for it to start...
      Activity currentActivity = getInstrumentation().waitForMonitorWithTimeout(monitor, 5);
      assertThat(currentActivity, is(notNullValue()));

      // Type into the username field...
      View currentView = currentActivity.findViewById(username_field);
      assertThat(currentView, is(notNullValue()));
      assertThat(currentView, instanceOf(EditText.class));
      TouchUtils.clickView(this, currentView);
      instrumentation.sendStringSync("MyUsername");

      // Type into the password field...
      currentView = currentActivity.findViewById(password_field);
      assertThat(currentView, is(notNullValue()));
      assertThat(currentView, instanceOf(EditText.class));
      TouchUtils.clickView(this, currentView);
      instrumentation.sendStringSync("MyPassword");

      // Register we are interested in the welcome activity...
      // this has to be done before we do something that will send us to that
      // activity...
      instrumentation.removeMonitor(monitor);
      monitor = instrumentation.addMonitor(WelcomeActivity.class.getName(), null, false);

      // Click the login button...
      currentView = currentActivity.findViewById(login_button;
      assertThat(currentView, is(notNullValue()));
      assertThat(currentView, instanceOf(Button.class));
      TouchUtils.clickView(this, currentView);

      // Wait for the welcome page to start...
      currentActivity = getInstrumentation().waitForMonitorWithTimeout(monitor, 5);
      assertThat(currentActivity, is(notNullValue()));

      // Make sure we are logged in...
      currentView = currentActivity.findViewById(welcome_message);
      assertThat(currentView, is(notNullValue()));
      assertThat(currentView, instanceOf(TextView.class));
      assertThat(((TextView)currentView).getText().toString(), is("Welcome, MyUsername!"));
   }
}
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