需求场景举例:
当我们项目中使用了第三方组件的页面,而组件现有的页面又不能满足我们项目的设计需求,此时你该如何做呢?
向组件开发方提需求,让他满足自己一次?
如果组件是自家人开发的或许还可以,那要是其他团队或者公司的开发的呢,人家会鸟你吗?
很显然,一个简单而特殊的需求,组件开发者不一定会给你做改动,那么该怎么办呢?
那只有我们自己改喽!
一些思考:
如何修改ui呢?
- 修改布局文件
- java代码中动态修改
好像1不太现实直接修改aar里面布局文件,那剩下的就是在java代码中动态修改喽。
如何修改?
关键是拿到Actvity或Fragment实例,进而获取想要动态进行修改的视图实例(若要添加视图元素需要获取到父视图实例)。
改如何做呢?
ActivityLifecycleCallbacks
用于监听整个应用的Activity
生命周期变化的接口,接口声明如下:
public interface ActivityLifecycleCallbacks {
void onActivityCreated(Activity var1, Bundle var2);
void onActivityStarted(Activity var1);
void onActivityResumed(Activity var1);
void onActivityPaused(Activity var1);
void onActivityStopped(Activity var1);
void onActivitySaveInstanceState(Activity var1, Bundle var2);
void onActivityDestroyed(Activity var1);
}
从接口生命可以发现,所有的抽象方法对应Activity
的生命周期方法,在Activity
每个生命周期阶段都会回调接口实现当中相应的方法。还可以发现每个方法的参数都要Activity
,没错,这个Activity就是生命周期正在发生变化的那个,这样我们就可以通过这个Activity
引用,就可以拿到他的View视图和Fragement实例等等,我们需要的对象引用,进而进行动态修改。
具体实践举例
这里的例子是向其他组件的页面中添加两个视图元素,并响应点击事件。
实现监听接口
public class BeiKaoActivityLefecycleCallback implements Application.ActivityLifecycleCallbacks {
private IConsultEntryController mController;
private final String CURRENT_ACTIVITY_NAME = "com.nd.module_im.im.activity.ChatActivity";
public BeiKaoActivityLefecycleCallback(Activity activity) {
mController = new ConsultEntryControllerImpl(activity);
}
@Override
public void onActivityCreated(Activity activity, Bundle bundle) {
}
@Override
public void onActivityStarted(Activity activity) {
}
@Override
public void onActivityResumed(Activity activity) {
Log.d(activity.getClass().getSimpleName(), "onActivityResumed");
String canonicalName = activity.getClass().getCanonicalName();
if(CURRENT_ACTIVITY_NAME.equals(canonicalName)){
mController.showFloatEntry(activity);
}
}
@Override
public void onActivityPaused(Activity activity) {
}
@Override
public void onActivityStopped(Activity activity) {
Log.d(activity.getClass().getSimpleName(), "onActivityStopped");
String canonicalName = activity.getClass().getCanonicalName();
if(CURRENT_ACTIVITY_NAME.equals(canonicalName)){
mController.hideFloatEntry(activity);
}
}
@Override
public void onActivitySaveInstanceState(Activity activity, Bundle bundle) {
}
@Override
public void onActivityDestroyed(Activity activity) {
}
}
添加生命周期监听
context.registerActivityLifecycleCallbacks(new BeiKaoActivityLefecycleCallback(getActivity()));
获取视图元素并动态修改视图
ublic class ConsultEntryControllerImpl implements IConsultEntryController, View.OnClickListener {
private TextView floatView = null;
private LinearLayout mLinearLayout;
public ConsultEntryControllerImpl(Activity activity) {
initFloatView(activity);
}
protected void initFloatView(Activity activity) {
floatView = new TextView(activity);
floatView.setBackgroundResource(R.drawable.bg_primary_color_selector);
floatView.setTextColor(AppContextUtil.getColor(R.color.white));
floatView.setTextSize(TypedValue.COMPLEX_UNIT_SP,16);
floatView.setText("人工客服");
floatView.setGravity(Gravity.CENTER);
floatView.setPadding(MixedUtils.dpToPx(activity,8),0,MixedUtils.dpToPx(activity,8),0);
floatView.setOnClickListener(this);
mLinearLayout = (LinearLayout) LayoutInflater.from(activity).inflate(R.layout.layout_consult_entry,null);
mLinearLayout.setOnClickListener(this);
}
@Override
public void showFloatEntry(final Activity activity) {
Fragment fragment = ((AppCompatActivity) activity).getSupportFragmentManager().findFragmentByTag("chat");
if(!fragment.getClass().getCanonicalName().equals("com.nd.module_im.psp.ui.activity.ChatFragment_Psp")){
return;
}
RelativeLayout parent = (RelativeLayout) floatView.getParent();
if(parent != null){
return;
}
RelativeLayout frameLayout = (RelativeLayout) fragment.getView();
RelativeLayout.LayoutParams topBtnParam = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, MixedUtils.dpToPx(activity,56));
topBtnParam.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
RelativeLayout.LayoutParams linnearLayoutParam = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, MixedUtils.dpToPx(activity,28));
linnearLayoutParam.topMargin = MixedUtils.dpToPx(activity,56);
frameLayout.addView(floatView, topBtnParam);
frameLayout.addView(mLinearLayout,linnearLayoutParam);
Log.d("ConsultEntryControllerI", "显示人工咨询入口图标");
}
@Override
public void hideFloatEntry(Activity activity) {
RelativeLayout parent = (RelativeLayout) floatView.getParent();
if(parent == null){
return;
}
parent.removeView(floatView);
parent.removeView(mLinearLayout);
}
@Override
public void onClick(View view) {
CounselChatUtils.toXNCounselChat(AppContextUtil.getContext());
}
}