在 Android 视图中使用 UI 元素进行测试

问题描述

我正在尝试使用以下测试用例测试简单的 UI，主要思想是在测试中设置一些 UI 文本(模仿用户输入)，然后主动点击一个事件.

I am attempting to test simple UI with the following test case, The main idea is to set in the test some of the UI text (to mimic user input) and then actively click an event.

public class StackTestCase 
extends ActivityInstrumentationTestCase2<Stack> 
{
private StackDemo mActivity;

private EditText eaten;
    public StuckTestCase() {
         super("com.crocodil.software.stack", Stack.class);


    }
    public StuckTestCase(Class<Stack> activityClass) {
         super("com.crocodil.software.stack", activityClass);

    }
    protected void setUp() throws Exception {
        super.setUp();
        mActivity = this.getActivity();
        mCount = (Button) mActivity.findViewById(com.crocodil.software.stack.R.id.action);
        eaten = (EditText) mActivity.findViewById(com.crocodil.software.stack.R.id.eaten);

    }

    public void testPreconditions() {
        assertNotNull(mStatus);
      }

    public void testSimpleDefaults(){
        double status = Double.valueOf(mStatus.getText().toString());
        eaten.setText(2);
        mCount.performClick();
        assertEquals((status-2),Double.valueOf(mStatus.getText().toString()));
    }

}

运行结果是异常——

android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
at android.view.ViewRoot.checkThread(ViewRoot.java:2802)
at android.view.ViewRoot.playSoundEffect(ViewRoot.java:2581)
at android.view.View.playSoundEffect(View.java:8516)
at android.view.View.performClick(View.java:2407)
at com.crocodil.software.stack.test.StackTestCase.testSimpleDefaults(StackTestCase.java:46)
at java.lang.reflect.Method.invokeNative(Native Method)
at android.test.InstrumentationTestCase.runMethod(InstrumentationTestCase.java:204)
at android.test.InstrumentationTestCase.runTest(InstrumentationTestCase.java:194)
at android.test.ActivityInstrumentationTestCase2.runTest(ActivityInstrumentationTestCase2.java:186)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:169)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:154)
at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:520)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1447)

这发生在每次访问 UI 元素时，我无法通过使用句柄或异步任务来避免它?有什么建议吗?

This happens on each access to the UI elements and i was unable to avoid it by using handles or async task ? any suggestions?

推荐答案

这是一个老问题，但我还是给你一个答案，以防有人偶然发现.

This is an old question, but I'm giving you an answer anyway, in case someone stumbles upon it.

除了主线程(UI 线程)之外，您不能从任何地方更改 UI 小部件的状态.您的 performClick 必须像这样完成:

You are not allowed to change states of UI widgets from anywhere but the main thread (UI thread). Your performClick must be done like this:

mActivity.runOnUiThread(new Runnable() {
  @Override
  public void run() {
    mCount.performClick();
  }
});

但这还不是全部，您还需要通过添加以下行来将您的仪器测试与 ui 同步:

But that is not all, you will also need to sync your instrumentation test with the ui, by adding the following line:

getInstrumentation().waitForIdleSync();

同步行通常紧跟在 runOnUiThread() 代码之后.

The sync line is usually placed immediately after the runOnUiThread() code.

这篇关于在 Android 视图中使用 UI 元素进行测试的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持跟版网！