今天來說說MVP+DataBinding?的使用

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以一個登錄案例來講解

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布局：（ConstraintLayout 作為根布局）

<layout><data><variablename="onClick"type="com.zhangqie.mvplogin.LoginActivity.OnViewClick" /></data><android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".LoginActivity"><TextViewandroid:id="@+id/tv1"android:layout_width="wrap_content"android:layout_height="45dp"android:gravity="center"android:text="賬號："android:textColor="@android:color/black"android:textSize="16dp"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintHorizontal_bias="0.2"app:layout_constraintLeft_toLeftOf="parent"app:layout_constraintRight_toRightOf="parent"app:layout_constraintTop_toTopOf="parent"app:layout_constraintVertical_bias="0.4" /><EditTextandroid:id="@+id/et_name"android:layout_width="222dp"android:layout_height="45dp"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintLeft_toRightOf="@+id/tv1"app:layout_constraintTop_toTopOf="parent"app:layout_constraintVertical_bias="0.4" /><TextViewandroid:id="@+id/tv2"android:layout_width="wrap_content"android:layout_height="45dp"android:gravity="center"android:text="密碼："android:textColor="@android:color/black"android:textSize="16dp"app:layout_constraintHorizontal_bias="0.2"app:layout_constraintLeft_toLeftOf="parent"app:layout_constraintRight_toRightOf="parent"app:layout_constraintTop_toBottomOf="@+id/tv1" /><EditTextandroid:id="@+id/et_pwd"android:layout_width="222dp"android:layout_height="45dp"app:layout_constraintLeft_toRightOf="@+id/tv2"app:layout_constraintTop_toBottomOf="@+id/et_name" /><Buttonandroid:id="@+id/btn_login"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_margin="25dp"android:onClick="@{onClick.OnClickCommand}"android:text="登錄"app:layout_constraintTop_toBottomOf="@+id/et_pwd" /></android.support.constraint.ConstraintLayout> </layout>

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?BaseActivity.Java

public abstract class BaseActivity<D extends ViewDataBinding,V,T extends BasePresenter<V>> extends AppCompatActivity{protected D viewDataBinding;protected T p;@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);viewDataBinding = DataBindingUtil.setContentView(this, setMainLayout());p = createPresenter();p.attachView((V)this);initView();initBeforeData();}protected abstract T createPresenter();/**** 初始化布局*/protected abstract int setMainLayout();/*** 初始化View*/protected abstract void initView();/*** 初始化先前數據*/protected abstract void initBeforeData();/**** 跳轉Activity* @param mClass*/protected void openActivity(Class<?> mClass) {openIntent(new Intent(this, mClass));}/*** 彈出toast 顯示時長short** @param msg*/protected void showToastShort(String msg) {if (!TextUtils.isEmpty(msg)) {Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();}}protected void showToastShort(int msg) {Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();}protected void openIntent(Intent intent) {startActivity(intent);}protected void openForResultActivity(Intent intent, int requestCode){startActivityForResult(intent,requestCode);}@Overrideprotected void onDestroy() {super.onDestroy();if (p != null){p.detachView();}}}

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Activity.java

public class LoginActivity extends BaseActivity<LoginMainBinding,IView,LoginPresenter> implements IView {@Overrideprotected LoginPresenter createPresenter() {return new LoginPresenter();}@Overrideprotected int setMainLayout() {return R.layout.login_main;}@Overrideprotected void initView() {viewDataBinding.setOnClick(new OnViewClick());}@Overrideprotected void initBeforeData() {}@Overridepublic void showLoading(String msg) {showToastShort(msg);}public class OnViewClick {public void OnClickCommand(View view) {switch (view.getId()) {case R.id.btn_login:p.showLogin(viewDataBinding.etName.getText().toString(),viewDataBinding.etPwd.getText().toString());break;}}} }

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?效果圖：

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源碼下載：?https://github.com/DickyQie/android-databinding

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總結：

• 減少各層之間耦合，易于后續的需求變化，降低維護成本。

• Presenter層獨立于Android代碼之外，可以進行Junit測試。

• 接口和類較多，互相做回調，代碼臃腫。

• Presenter層與View層是通過接口進行交互的，接口粒度不好控制。

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有不足之處，望指正

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轉載于:https://www.cnblogs.com/zhangqie/p/9779302.html

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