public void takeScreenshot(){
View decorView = viewFetcher.getRecentDecorView(viewFetcher.getWindowDecorViews());
screenshotTaker.takeScreenshot(decorView, null);
}
viewFetcher.getWindowDecorViews()用来获取当前屏幕上堆积的所有DecorView（可以把一个DecorView当做是一个画布，当你打开好多Activity时，相当于有好几个画布叠在了一起，每个画布上画着一个activity的画面）。而viewFetcher.getRecentDecorView()就相当于取最上一层的画布。进入ViewFetcher.java文件观察viewFetcher.getRecentDecorView()的源码，我发现它在排除了一些无用的view后，实际返回的是ViewFetcher.java中的另一个函数的结果：getRecentContainer(decorViews)。Be patient, 让我们看看getRecentContainer(decorViews)里卖的是什么药：
private final View getRecentContainer(View[] views) {
View container = null;
long drawingTime = 0;
View view;
for(int i = 0; i < views.length; i++){
view = views[i]; if (view != null && view.isShown() && view.hasWindowFocus() && view.getDrawingTime() > drawingTime) {
container = view;
drawingTime = view.getDrawingTime();
}
}
return container;
}
getRecentContainer(decorViews)函数判断哪个view在最上层的方法，是判断：
1. view不为空
view可见
3. view已经被focus上（就是该view是否处于被选中的、被激活的窗口中）
4. 渲染时间排在最后
public void takeScreenshot(){
View decorView = null;
while(decorView == null){
sleep(500);
View[] decorViews = viewFetcher.getWindowDecorViews();
decorView = viewFetcher.getRecentDecorView(decorViews);
}
screenshotTaker.takeScreenshot(decorView, null);
}
https://code.google.com/p/robotium/issues/detail?id=434&colspec=ID%20Type%20Stars%20Status%20Priority%20Milestone%20Owner%20Summary
Solo.java中添加：
public void assertCurrentActivity(String message, String name, int timeout, boolean takeScreenshot)
{
if(takeScreenshot){
asserter.assertCurrentActivity(message, name, timeout, this);
} else
assertCurrentActivity(message, name, timeout);
}
Asserter.java中添加：
public void assertCurrentActivity(String message, String name, int timeout, Solo solo)
{
if(!waiter.waitForActivity(name, timeout)){
solo.takeScreenshot("test_" + message + "_Failure");
Assert.assertTrue(message, false);
} else
solo.takeScreenshot("test_" + message + "_Success");
}
public View getViewByHierarchyViewerId(String id){
Context currContext = instrumentation.getTargetContext();
String packageName = currContext.getPackageName();
int viewId = currContext.getResources().getIdentifier(id, "id", packageName);
return getView(viewId);
