Android - 在运行时更改自定义标题视图

编辑正如评论中所指出的，上述解决方法并不理想.无需依赖 com.android.internal.R.id.title_container 常量，您可以在设置新标题时简单地隐藏旧的自定义标题.假设您有两个自定义标题布局:和如果你想用 custom_title_2 替换 custom_title_1，你可以隐藏前者并使用 setFeatureInt 添加后者:findViewById(R.id.custom_title_1).setVisibility(View.GONE);getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.custom_title_2);I am using a custom title view in my application for each activity. In one of the activities, based on button clicks I need to change the custom title view. Now this works fine every time when I make a call to setFeatureInt.But if I try to update any items in the custom title (say change the text of a button or a text view on the title), the update does not take place.Debugging through the code shows that the text view and button instances are not null and I can also see the custom title bar. But the text on the text view or the button is not updated. Has anyone else faced this problem?How do I resolve it?Thanks.EDITHere's what I tried. Does not get updated even on calling postInvalidate. getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.text_title); TextView databar = (TextView) findViewById(R.id.title_text); databar.setText("Some Text"); databar.postInvalidate(); Button leftButton = (Button) findViewById(R.id.left_btn); leftButton.setOnClickListener(mLeftListener); leftButton.setText("Left Btn"); leftButton.postInvalidate(); Button rightBtn = (Button) findViewById(R.id.right_btn); rightBtn.setOnClickListener(mRightListener); rightBtn.postInvalidate(); 解决方案 The problem is that the only Window implementation (PhoneWindow) uses a LayoutInflater in its setFeatureInt method and instantiates the new layout with inflate and attachToRoot=true. Consequently, when you call setFeatureInt, the new layouts are not replaced but attached to the internal title container and thus drawn on top of each other.You can workaround this by using the following helper method instead of setFeatureInt. The helper simply removes all views from the internal title container before the new custom title feature is set:private void setCustomTitleFeatureInt(int value) { try { // retrieve value for com.android.internal.R.id.title_container(=0x1020149) int titleContainerId = (Integer) Class.forName( "com.android.internal.R$id").getField("title_container").get(null); // remove all views from titleContainer ((ViewGroup) getWindow().findViewById(titleContainerId)).removeAllViews(); // add new custom title view getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, value); } catch(Exception ex) { // whatever you want to do here.. }}I'm not sure whether the current setFeatureInt behaviour is intended, but it is certainly not documented one way or the other which is why I'll take this to the android devs ;)EDITAs pointed out in the comments, the aforementioned workaround is not ideal. Instead of relying on the com.android.internal.R.id.title_container constant you could simply hide the old custom title whenever you set a new one.Let's assume you have two custom title layouts:<?xml version="1.0" encoding="utf-8"?><RelativeLayout android:id="@+id/custom_title_1" ...and<?xml version="1.0" encoding="utf-8"?><RelativeLayout android:id="@+id/custom_title_2" ...and you want to replace custom_title_1 with custom_title_2, you could hide former and use setFeatureInt to add the latter:findViewById(R.id.custom_title_1).setVisibility(View.GONE);getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.custom_title_2); 这篇关于Android - 在运行时更改自定义标题视图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！ 上岸，阿里云！