tablayout_viewpager_recycleview

最新推荐文章于 2022-01-18 14:34:56 发布

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#tablayout_viewpager_ #recycleview

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本文详细介绍了一个包含TabLayout和ViewPager的Android应用实例。通过MainActivity实现了用户登录功能，并使用TabActivity展示了一个带有多标签页的界面。每个标签页内嵌了一个Fragment，Fragment中又包含了RecyclerView组件，展示了如何为每个标签页加载不同的数据。

看md编辑器代码地址：

新的排版:https://blog.youkuaiyun.com/qq_15744297/article/details/86561856

1.首先我们看看activity_main.xml文件就一个相对布局---

代码如下：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                xmlns:tools="http://schemas.android.com/tools"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:paddingBottom="@dimen/activity_vertical_margin"
                android:paddingLeft="@dimen/activity_horizontal_margin"
                android:paddingRight="@dimen/activity_horizontal_margin"
                android:paddingTop="@dimen/activity_vertical_margin"
                tools:context=".act.MainActivity">

    <android.support.v7.widget.AppCompatTextView
            android:id="@+id/tvTitle"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="title"/>


    <android.support.v7.widget.AppCompatEditText
            android:id="@+id/etName"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/tvTitle"
            android:hint="请输入用户名"/>


    <android.support.v7.widget.AppCompatEditText
            android:id="@+id/etPwd"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/etName"
            android:hint="请输入密码"/>

    <android.support.v7.widget.AppCompatButton
            android:id="@+id/btnConfirm"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/etPwd"
            android:text="确定"/>


    <android.support.v7.widget.AppCompatButton
            android:id="@+id/btnStart"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/btnConfirm"
            android:text="开启startRecycleAct"/>
</RelativeLayout>

2来到MainActivity.java文件代码如下：

package com.example.acer_20130310.myapplication.act;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.AppCompatButton;
import android.support.v7.widget.AppCompatEditText;
import android.text.TextUtils;
import android.view.View;
import android.widget.Toast;

import com.example.acer_20130310.myapplication.utils.FileUtilsMethod;
import com.example.acer_20130310.myapplication.R;

import java.io.File;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private AppCompatEditText etName;
    private AppCompatEditText etPwd;
    private AppCompatButton btnConfirm;
    private AppCompatButton btnStart;
    private String pwd;
    private String name;
    private String data;
    private File file;
    String fileName = "user.txt";//用户名文件
    private String result;
    private Intent intent;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initViews();
    }

    //试图的初始化
    private void initViews() {
        etName = (AppCompatEditText) findViewById(R.id.etName);
        etPwd = (AppCompatEditText) findViewById(R.id.etPwd);
        btnConfirm = (AppCompatButton) findViewById(R.id.btnConfirm);
        btnStart = (AppCompatButton) findViewById(R.id.btnStart);
        btnConfirm.setOnClickListener(this);
        btnStart.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {


            case R.id.btnStart:

                intent = new Intent(MainActivity.this, TabActivity.class);
                startActivity(intent);
                break;

            case R.id.btnConfirm:

                name = etName.getText().toString().trim();
                pwd = etPwd.getText().toString().trim();
                if (!TextUtils.isEmpty(name) && !TextUtils.isEmpty(pwd)) {

                    data = name + "#####" + pwd;

                    //保存用户名
                    file = FileUtilsMethod.saveDataToFile(getApplicationContext(), data, fileName);
                    //读取文件中的数据
                    result = FileUtilsMethod.readFromFile(getApplicationContext(), fileName);
                    Toast.makeText(getApplicationContext(), "result=" + result, Toast.LENGTH_SHORT).show();
                }
                break;
        }
    }

}

上面很简单就2个文件编辑框用于保存用户的用户名以及密码保存到本地到文件中也就是java中的io流

3下面才是本次要学习的重点

首先看看activity_tab.xml文件

代码如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              xmlns:app="http://schemas.android.com/apk/res-auto"
              android:orientation="vertical">

    <android.support.design.widget.TabLayout
            android:id="@+id/slidingTabs"
            app:tabMode="scrollable"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

    </android.support.design.widget.TabLayout>
    <android.support.v4.view.ViewPager
            android:id="@+id/mViewPager"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

    </android.support.v4.view.ViewPager>
</LinearLayout>

//本Activity的布局文件就一个Tablayout+ViewPager

4.下面是TabActivity.java文件到的代码很简单

代码如下：

package com.example.acer_20130310.myapplication.act;

import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;

import com.example.acer_20130310.myapplication.R;
import com.example.acer_20130310.myapplication.adapter.TabFragmentPagerAdapter;

import butterknife.Bind;
import butterknife.ButterKnife;

public class TabActivity extends AppCompatActivity {


    @Bind(R.id.slidingTabs)
    TabLayout slidingTabs;
    @Bind(R.id.mViewPager)
    ViewPager mViewPager;

    private TabFragmentPagerAdapter mAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_tab);
        ButterKnife.bind(this);
        //
        mAdapter = new TabFragmentPagerAdapter(getSupportFragmentManager(), this);
        mViewPager.setAdapter(mAdapter);
        slidingTabs.setupWithViewPager(mViewPager);//这行代码要放在setAdapter之后 就是跟ViewPager进行一个绑定
    }
}

5下面我们来看看主要到ViewPager所要的FragmentPagerAdapter适配器的代码如下：

package com.example.acer_20130310.myapplication.adapter;

import android.content.Context;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;

import com.example.acer_20130310.myapplication.frag.PagerFragment;

/**
 * Created by acer-20130310 on 16-5-19.
 */
public class TabFragmentPagerAdapter extends FragmentPagerAdapter {

    private FragmentManager fm;
    private Context context;
    private String[] titles = new String[]{"tab1", "tab2", "tab3", "tab4", "tab5", "tab6", "tab7", "tab8"};
    private Fragment mFragment;

    public TabFragmentPagerAdapter(FragmentManager fm, Context context) {
        super(fm);
        this.fm = fm;
        this.context = context;
    }

    @Override
    public Fragment getItem(int position) {
        mFragment = PagerFragment.getInstance(position);
        return mFragment;
    }

    @Override
    public int getCount() {
        return titles.length;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return titles[position];
    }
}

我们知道上面到适配器里面装到是fragment

6.下面我们来看看Fragment 的布局文件fragment_view.xml

代码如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:orientation="vertical">


    <android.support.v7.widget.AppCompatTextView
            android:id="@+id/mTv"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"/>

    <android.support.v7.widget.RecyclerView
            android:id="@+id/mRv"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

    </android.support.v7.widget.RecyclerView>
</LinearLayout>

7.下面看看PagerFragment.java源文件到代码

如下：

package com.example.acer_20130310.myapplication.frag;


import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v7.widget.AppCompatTextView;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

import com.example.acer_20130310.myapplication.R;
import com.example.acer_20130310.myapplication.adapter.MrvAdapter;

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

/**
 * Created by acer-20130310 on 16-5-19.
 */
public class PagerFragment extends Fragment {

    public static final String PAGER = "pageFragment";
    private static PagerFragment mPagerFragment;
    private int mpage;

    private View view;
    private AppCompatTextView mTv;
    private RecyclerView mRv;

    List<String> strings;
    private MrvAdapter mAdapter;
    private GridLayoutManager mLayoutManager;

    /**
     * 初始化
     *
     * @param mpage
     * @return
     */
    public static PagerFragment getInstance(int mpage) {

        Bundle bundle = new Bundle();
        bundle.putInt(PAGER, mpage);
        mPagerFragment = new PagerFragment();
        mPagerFragment.setArguments(bundle);
        return mPagerFragment;
    }


    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mpage = getArguments().getInt(PAGER);

    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        view = view.inflate(getActivity(), R.layout.fragment_view, null);
        mTv = (AppCompatTextView) view.findViewById(R.id.mTv);
        mRv = (RecyclerView) view.findViewById(R.id.mRv);
        return view;
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);


        strings = new ArrayList<>();
        for (int i = 0; i < 100; i++) {
            strings.add(mpage + "_" + i);
        }
        //做数据的显示
        mTv.setText("pagerfragment:" + mpage);
        mAdapter = new MrvAdapter(getActivity(), strings);
        mLayoutManager = new GridLayoutManager(getActivity(), 4);
        mRv.setLayoutManager(mLayoutManager);
        mRv.setAdapter(mAdapter);
        mAdapter.setOnitemListener(new MrvAdapter.onItemSelected() {
            @Override
            public void onItemClickListener(String string) {
                //
                Toast.makeText(getActivity(), "哥被点击了：" + string, Toast.LENGTH_SHORT).show();
            }
        });
    }
}

8.最后是我们到MrvAdapter.java源文件

package com.example.acer_20130310.myapplication.adapter;

import android.content.Context;
import android.support.v7.widget.AppCompatImageView;
import android.support.v7.widget.AppCompatTextView;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;

import com.example.acer_20130310.myapplication.R;

import java.util.List;

/**
 * Created by acer-20130310 on 16-5-19.
 */
public class MrvAdapter extends RecyclerView.Adapter<MrvAdapter.ViewHolder> {

    private Context context;
    private List<String> strings;
    private String itemString;
    private LinearLayout itemLayout;

    public MrvAdapter(Context context, List<String> strings) {
        this.context = context;
        this.strings = strings;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

        //创建viewholder
        View view = View.inflate(context, R.layout.item_view, null);
        ViewHolder viewHolder = new ViewHolder(view);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        itemString = strings.get(position);
        holder.itemText.setText(itemString);
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //项的监听
                if (mOnItemSelected != null) {
                    mOnItemSelected.onItemClickListener(itemString);

                }
            }
        });
    }

    @Override
    public int getItemCount() {
        return strings.size();
    }

    class ViewHolder extends RecyclerView.ViewHolder {

        AppCompatImageView itemIv;
        AppCompatTextView itemText;
        LinearLayout itemLayout;
        public ViewHolder(View itemView) {
            super(itemView);
            itemIv = (AppCompatImageView) itemView.findViewById(R.id.itemView);
            itemText = (AppCompatTextView) itemView.findViewById(R.id.itemText);
            itemLayout = (LinearLayout) itemView.findViewById(R.id.itemLayout);
        }
    }
    private onItemSelected mOnItemSelected;
    //这个方法提供给外界使用
    public void setOnitemListener(onItemSelected onItemSelectend) {
        this.mOnItemSelected = onItemSelectend;
    }
   //RecycleView的适配器监听事件的接口 供外界使用
    public interface onItemSelected {
        void onItemClickListener(String string);
    }


}