MVVM需要用到DataBinding知识,参考Android DataBinding简单使用
1、生成DataBinding布局
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">
<data>
<variable
name="viewModel"
type="com.app.mvvmdemo.MVVMViewModel" />
</data>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical">
<TextView
android:id="@+id/tv_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="16sp"
android:text="@{viewModel.result}" />
<EditText
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:text="@={viewModel.userInput}"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:onClick="@{viewModel.getData}"
android:text="替换" />
</LinearLayout>
</layout>
2、实现MVVMViewModel
public class MVVMViewModel extends BaseObservable {
private MVVMModel mvvmModel;
//EditText数据
private String userInput;
//网络返回数据
private String result;
public MVVMViewModel(Application application){
mvvmModel = new MVVMModel();
}
public void getData(View view){
mvvmModel.getHttpData(userInput, new MCallback() {
@Override
public void onSuccess(String text) {
setResult(text);
}
@Override
public void onFailed() {
setResult("数据获取失败");
}
});
}
@Bindable
public String getResult() {
return result;
}
public void setResult(String result) {
this.result = result;
notifyPropertyChanged(BR.result);
}
public String getUserInput() {
return userInput;
}
public void setUserInput(String userInput) {
this.userInput = userInput;
}
}
public class MVVMModel {
//模拟网络请求获取数据
public void getHttpData(String user, MCallback callback){
Random random = new Random();
boolean isSuccess = random.nextBoolean();
if (isSuccess){
callback.onSuccess("数据获取成功:" + user);
} else {
callback.onFailed();
}
}
}
public interface MCallback {
void onSuccess(String text);
void onFailed();
}
3、Activity代码
public class MVVMActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ActivityMvvmBinding binding =
DataBindingUtil.setContentView(this, R.layout.activity_mvvm);
//绑定ViewModel
MVVMViewModel mvvmViewModel = new MVVMViewModel(getApplication());
binding.setViewModel(mvvmViewModel);
}
}
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