fragment简单的切换

最新推荐文章于 2022-05-10 16:47:47 发布

原创最新推荐文章于 2022-05-10 16:47:47 发布 · 242 阅读

CC 4.0 BY-SA版权

本文介绍了一个使用Android支持库v4进行Fragment切换的例子。通过RadioGroup和RadioButton控件触发不同Fragment的显示与隐藏，实现简单的Tab布局效果。代码展示了如何初始化Fragment、设置点击监听以及在MainActivity中实现Fragment的动态替换。

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布局：

<?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"
    >
    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="9"
        android:id="@+id/main_frame"
        />
    <RadioGroup
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:orientation="horizontal"
        android:id="@+id/main_rg"
        >
        <RadioButton
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:id="@+id/main_rbtn1"
            android:text="@string/ye1"
            android:layout_weight="1"
            android:gravity="center"
            android:button="@null"
            />
        <RadioButton
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:id="@+id/main_rbtn2"
            android:text="@string/ye2"
            android:layout_weight="1"
            android:gravity="center"
            android:button="@null"
            />
    </RadioGroup>
</LinearLayout>

MainActivity ：

package com.example.fragment_qiehuang;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v7.app.AppCompatActivity;
import android.widget.FrameLayout;
import android.widget.RadioButton;
import android.widget.RadioGroup;

import com.example.fragment_qiehuang.frament.FragmentOne;
import com.example.fragment_qiehuang.frament.FragmentTwo;

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

import butterknife.BindView;
import butterknife.ButterKnife;

public class MainActivity extends AppCompatActivity implements RadioGroup.OnCheckedChangeListener {

    @BindView(R.id.main_frame)
    FrameLayout mainFrame;
    @BindView(R.id.main_rbtn1)
    RadioButton mainRbtn1;
    @BindView(R.id.main_rbtn2)
    RadioButton mainRbtn2;
    @BindView(R.id.main_rg)
    RadioGroup mainRg;
    private FragmentManager fragmentManager;
    private List<Fragment> fragmentList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        init();
        setOnClick();
        //默认选中需要放在点击事件后面
        mainRg.check(R.id.main_rbtn1);
    }

    private void init() {
        fragmentList=new ArrayList<>();
        fragmentList.add(new FragmentOne());
        fragmentList.add(new FragmentTwo());
        fragmentManager = getSupportFragmentManager();
    }

    private void setOnClick() {
        mainRg.setOnCheckedChangeListener(this);
    }

    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) {
        switch (checkedId){
            case R.id.main_rbtn1:
                changefragment(fragmentList.get(0));
                break;
            case R.id.main_rbtn2:
                changefragment(fragmentList.get(1));
                break;
        }
    }

    private void changefragment(Fragment fragment) {
        fragmentManager.beginTransaction().replace(R.id.main_frame,fragment).commit();
    }
}