时间:2021-01-21 10:51:02 | 栏目:Android代码 | 点击:次
最近在学习DataBinding的使用,中间遇到了不少的坑,记录以下,帮助以后学习DataBinding的朋友。
有一个 ViewModel 类,有一个 xml,xml 绑定了 ViewModel .
1. @{click}
//xml: <Button android:layout_width="match_parent" android:layout_height="48dp" android:onClick="@{click}" /> //ViewModel: public void click(View view){ }
2. 不带参数:@{() -> viewModel.click()}
//xml: <Button android:layout_width="match_parent" android:layout_height="48dp" android:onClick="@{() -> viewModel.click()}" /> //ViewModel: public void click(){ }
3. @{viewModel::click}
//xml: <Button android:layout_width="match_parent" android:layout_height="48dp" android:onClick="@{viewModel::click}" /> //ViewModel: public void click(View view){ }
tip: 如果是在其它类中设置点击方法,如 EventHandlers.java, 其实与上面一致
//xml: <variable name="handler" type="com.xx.xxx.EventHandlers" /> <Button android:layout_width="match_parent" android:layout_height="48dp" android:onClick="@{handler::click}" /> // UI类:绑定handler,如绑定ViewModel那样 EventHandlers handler = new EventHandlers(); binding.setHandler(handler); // EventHandlers 执行click事件 public void click(View view){ //do }
4. 带参数:@{() -> viewModel.click(obj.id)}
//xml: <variable name="viewModel" type="com.xx.xxx.ViewModel" /> <variable name="obj" type="com.xx.xxx.User" /> <Button android:layout_width="match_parent" android:layout_height="48dp" android:onClick="@{() -> viewModel.click(obj.id)}" /> //ViewModel: public void click(long id){ //do }
5. ObservableField<OnClickListener>
//xml: <variable name="iconView" type="com.xxxxx.IconView" /> <RelativeLayout android:id="@+id/rl_icon_view" android:layout_width="match_parent" android:layout_height="55dp" android:onClick="@{iconView.clickListener}" > //IconView: public final ObservableField<OnClickListener> clickListener=new ObservableField<>(); //xml所在的Activity类: binding.iconView.clickListener.set(new View.OnClickListener() { @Override public void onClick(View v) { Toast.makeText(getApplicationContext(),"iconView",Toast.LENGTH_SHORT).show(); } });
6. 带参数
android:onClick="@{()->loadingModel.chooseLang(2)}" public void chooseLang(int language) { LogUtil.i(TAG, "language=" + language); }
7. 带view的参数
//xml: <variable name="listener" type="test.carrie.todomvvmtest.ui.OnTaskItemListener"/> android:onClick="@{(view)->listener.onCheckBoxClick(obj,view)}" //adapter: public void onCheckBoxClick(ToDo entity, View v) { }
总结