抽取Activity 和 Fragment 基类

最新推荐文章于 2020-08-11 17:24:54 发布

原创最新推荐文章于 2020-08-11 17:24:54 发布 · 264 阅读

CC 4.0 BY-SA版权

本文介绍了一种在Android应用开发中使用基类设计模式的方法，通过创建BaseMainActivity和BaseFragMent基类，实现代码复用和模块化。BaseMainActivity用于Activity的通用初始化和数据处理，而BaseFragMent则针对Fragment进行抽象。这种设计有助于提高开发效率，减少重复代码。

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创建BaseMainActivity 继承 AppCompatActivity并抽取基类

package jiaoyibo.bawei.com.zong.base;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;

/**
 * <p>文件描述：<p>
 * <p>作者：JYB<p>
 * <p>创建时间：2019/1/7<p>
 * <p>更改时间：2019/1/7<p>
 * <p>版本号：1<p>
 */
public abstract class BaseMainActivity extends AppCompatActivity {


    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(getLayoutId());
        initView();
        initData();
    }
    //抽取设置监听的方法
    protected abstract void initData();
    //抽取加载数据的方法
    protected abstract void initView();
    //抽取加载布局的方法
    protected abstract int getLayoutId();

}

MainActivity

package jiaoyibo.bawei.com.zong;

import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.BottomNavigationView;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.view.MenuItem;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

import jiaoyibo.bawei.com.zong.base.BaseMainActivity;
import jiaoyibo.bawei.com.zong.fragment.FragmentOne;
import jiaoyibo.bawei.com.zong.fragment.FragmentThree;
import jiaoyibo.bawei.com.zong.fragment.FragmentTwo;

public class MainActivity extends BaseMainActivity {

    private TextView mTextMessage;
    private List<Fragment> list = new ArrayList<>();
    private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
            = new BottomNavigationView.OnNavigationItemSelectedListener() {

        @Override
        public boolean onNavigationItemSelected(@NonNull MenuItem item) {
            switch (item.getItemId()) {
                case R.id.one:
                    viewPager.setCurrentItem(0);
                    return true;
                case R.id.two:
                    viewPager.setCurrentItem(1);
                    return true;
                case R.id.three:
                    viewPager.setCurrentItem(2);
                    return true;
            }
            return false;
        }
    };
    private ViewPager viewPager;
    private BottomNavigationView navigation;

    @Override
    protected void initData() {
        list.add(new FragmentOne());
        list.add(new FragmentTwo());
        list.add(new FragmentThree());
        viewPager.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {
            @Override
            public Fragment getItem(int i) {
                return list.get(i);
            }

            @Override
            public int getCount() {
                return list.size();
            }
        });
       viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
           @Override
           public void onPageScrolled(int i, float v, int i1) {

           }

           @Override
           public void onPageSelected(int i) {
               switch (i){
                   case 0:
                       navigation.setSelectedItemId(R.id.one);
                       break;
                   case 1:
                       navigation.setSelectedItemId(R.id.two);
                       break;
                   case 2:
                       navigation.setSelectedItemId(R.id.three);
                       break;
               }
           }

           @Override
           public void onPageScrollStateChanged(int i) {

           }
       });
    }

    @Override
    protected void initView() {
        viewPager = findViewById(R.id.viewPager);
        mTextMessage = (TextView) findViewById(R.id.message);
        navigation = (BottomNavigationView) findViewById(R.id.navigation);
        navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
    }

    @Override
    protected int getLayoutId() {
        return R.layout.activity_main;
    }

}

创建BaseFragMent 继承 FragMent 并抽取基类

package jiaoyibo.bawei.com.zong.base;

import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

/**
 * <p>文件描述：<p>
 * <p>作者：JYB<p>
 * <p>创建时间：2019/1/7<p>
 * <p>更改时间：2019/1/7<p>
 * <p>版本号：1<p>
 */
public abstract class BaseFragMent extends Fragment {
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(getLayoutId(),container,false);
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        initView(view);
        initData();
    }
    //抽取设置监听的方法
    protected abstract void initData();
    //抽取加载数据的方法
    protected abstract void initView(View view);
    //抽取加载布局的方法
    protected abstract int getLayoutId();

}

Fragment

package jiaoyibo.bawei.com.zong.fragment;

import android.view.View;

import jiaoyibo.bawei.com.zong.R;
import jiaoyibo.bawei.com.zong.base.BaseFragMent;

/**
 * <p>文件描述：<p>
 * <p>作者：JYB<p>
 * <p>创建时间：2019/1/7<p>
 * <p>更改时间：2019/1/7<p>
 * <p>版本号：1<p>
 */
public class FragmentOne extends BaseFragMent {
    @Override
    protected void initData() {

    }

    @Override
    protected void initView(View view) {

    }

    @Override
    protected int getLayoutId() {
        return R.layout.fragment_01;
    }
}