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Android中dataBinding使用的简单封装

作者:zhang106209

前面一段时间学习了一下Android中的DataBinding,但是只是很简单地实现了一下,DataBinding中最强大的地方还没有认真地学习过,有很多地方还不理解,下面这篇文章主要给大家介绍了关于Android中dataBinding使用的简单封装,需要的朋友可以参考下

一、简介

本文是databinding使用的简单封装,主要是在基类BaseActivity和BaseFragment中

二、具体步骤

1.在build.gradle中开启databinding

dataBinding { enabled = true }

2.在BaseActivity的封装,主要是通过反射的方式获取。如下

package com.zw.databindingdemo.java;
import android.os.Bundle;
import android.view.LayoutInflater;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.databinding.ViewDataBinding;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
/**
 * 描述:
 * @author: zw
 * @time: 2023/5/22 17:33
 */
public abstract class BaseActivity<VB extends ViewDataBinding> extends AppCompatActivity {
    public VB mBinding;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        createBinding();
    }
    private void createBinding() {
        Class<VB> vbClass = getVbClass();
        try {
            if (vbClass == null) {
                return;
            }
            Method method = vbClass.getMethod("inflate", LayoutInflater.class);
            mBinding = (VB) method.invoke(null, getLayoutInflater());
            setContentView(mBinding.getRoot());
        } catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException e) {
            e.printStackTrace();
        }
    }
    private Class<VB> getVbClass() {
        ParameterizedType parameterizedType = (ParameterizedType) this.getClass().getGenericSuperclass();
        if (parameterizedType == null) {
            return null;
        }
        Class<VB> vbClass = (Class<VB>) parameterizedType.getActualTypeArguments()[0];
        return vbClass;
    }
}

3.在Activity中使用如下

package com.zw.databindingdemo.java;
import android.os.Bundle;
import androidx.annotation.Nullable;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;
import com.zw.databindingdemo.databinding.ActivityTestBinding;
/**
 * 描述:
 * @author: zw
 * @time: 2023/5/22 17:33
 */
public class TestActivity extends BaseActivity<ActivityTestBinding> {
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mBinding.tvName.setText("测试 java Activity");
        mBinding.btnGo.setOnClickListener(v -> {
            initFragment();
        });
    }
    private void initFragment() {
        FragmentManager fm = getSupportFragmentManager();
        FragmentTransaction ft = fm.beginTransaction();
        ft.replace(mBinding.frameLayout.getId(), new TestFragment());
        ft.commit();
    }
}

4.在BaseFragment的封装

package com.zw.databindingdemo.java;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.databinding.ViewDataBinding;
import androidx.fragment.app.Fragment;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
/**
 * 描述:
 * @author: zw
 * @time: 2023/5/22 17:33
 */
public abstract class BaseFragment<VB extends ViewDataBinding> extends Fragment {
    public VB mBinding;
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        createBinding(inflater, container);
        return mBinding.getRoot();
    }
    private void createBinding(LayoutInflater inflater, ViewGroup container) {
        Class<VB> vbClass = getVbClass();
        try {
            if (vbClass == null) {
                return;
            }
         /*   Method method = vbClass.getMethod("inflate", LayoutInflater.class, ViewGroup.class, Boolean.class);*/
            Method method = vbClass.getMethod("inflate", LayoutInflater.class);
            mBinding = (VB) method.invoke(null, inflater);
        } catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException e) {
            e.printStackTrace();
        }
    }
    private Class<VB> getVbClass() {
        ParameterizedType parameterizedType = (ParameterizedType) this.getClass().getGenericSuperclass();
        if (parameterizedType == null) {
            return null;
        }
        return (Class<VB>) parameterizedType.getActualTypeArguments()[0];
    }
}

5.在Fragment的使用如下

package com.zw.databindingdemo.java;
import android.os.Bundle;
import android.view.View;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import com.zw.databindingdemo.databinding.FragmentTestBinding;
/**
 * 描述:
 * @author: zw
 * @time: 2023/5/22 17:33
 */
public class TestFragment extends BaseFragment<FragmentTestBinding> {
    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        mBinding.tvName.setText("测试 java Fragment");
    }
}

6.Kotlin 版本

 package com.zw.databindingdemo.kotlin
import android.os.Bundle
import android.view.LayoutInflater
import androidx.appcompat.app.AppCompatActivity
import androidx.databinding.ViewDataBinding
import java.lang.reflect.ParameterizedType
/**
 * 描述:
 * @author: zw
 * @time: 2023/5/22 17:33
 */
abstract class BaseActivityKotlin<VB : ViewDataBinding> : AppCompatActivity() {
    public lateinit var mBinding: VB
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        mBinding = createBinding()
        setContentView(mBinding.root)
    }
    private fun createBinding(): VB {
        val vbClass = getVBClass()
        val method = vbClass.getMethod("inflate", LayoutInflater::class.java)
        return method.invoke(null, layoutInflater) as VB
    }
    @Suppress("UNCHECKED_CAST")
    private fun getVBClass(): Class<VB> {
        val type = javaClass.genericSuperclass as ParameterizedType
        return type.actualTypeArguments[0] as Class<VB>
    }
}
package com.zw.databindingdemo.kotlin
import android.os.Bundle
import com.zw.databindingdemo.databinding.ActivityTestKotlinBinding
/**
 * 描述:
 * @author: zw
 * @time: 2023/5/22 17:33
 */
class TestActivityKotlin: BaseActivityKotlin<ActivityTestKotlinBinding>() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        mBinding.tvName.text = "测试 Kotlin Activity"
        mBinding.btnGo.setOnClickListener { initFragment() }
    }
    private fun initFragment() {
        val fm = supportFragmentManager
        val ft = fm.beginTransaction()
        ft.replace(mBinding.frameLayout.id, TestFragmentKotlin())
        ft.commit()
    }
}
package com.zw.databindingdemo.kotlin
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.databinding.ViewDataBinding
import androidx.fragment.app.Fragment
import java.lang.reflect.ParameterizedType
/**
 * 描述:
 * @author: zw
 * @time: 2023/5/22 17:33
 */
abstract class BaseFragmentKotlin<VB : ViewDataBinding> : Fragment() {
    public lateinit var mBinding: VB
    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        mBinding = createBinding(inflater, container)
        return mBinding.root
    }
    private fun createBinding(inflater: LayoutInflater, container: ViewGroup?): VB {
        val vbClass = getVBClass()
        val method = vbClass.getMethod(
            "inflate",
            LayoutInflater::class.java,
            ViewGroup::class.java,
            Boolean::class.java
        )
        return method.invoke(null, inflater, container, false) as VB
    }
    @Suppress("UNCHECKED_CAST")
    private fun getVBClass(): Class<VB> {
        val type = javaClass.genericSuperclass as ParameterizedType
        return type.actualTypeArguments[0] as Class<VB>
    }
}
package com.zw.databindingdemo.kotlin
import android.os.Bundle
import android.view.View
import com.zw.databindingdemo.databinding.FragmentTestKotlinBinding
/**
 * 描述:
 * @author: zw
 * @time: 2023/5/22 17:33
 */
class TestFragmentKotlin : BaseFragmentKotlin<FragmentTestKotlinBinding>() {
    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        mBinding.tvName.text = "测试 Kotlin Fragment"
    }
}

总结

到此这篇关于Android中dataBinding使用的简单封装的文章就介绍到这了,更多相关Android dataBinding封装内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家!

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