Fragment碎片的使用

Android Fragment使用详解

最新推荐文章于 2021-10-26 14:17:58 发布

转载最新推荐文章于 2021-10-26 14:17:58 发布 · 57 阅读

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原文链接：http://www.cnblogs.com/412013cl/p/9066229.html

本文详细介绍了Android中Fragment的两种使用方式：静态加载和动态加载。通过具体的代码示例，展示了如何在XML布局文件中声明Fragment，并在Java代码中实现Fragment的动态替换。

第一种:静态使用方法

left_fragment.xml

<?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">


    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="button" />
</LinearLayout>

right_fragment.xml

<?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:background="#00ff00"
    android:orientation="vertical">


    <TextView
        android:text="This is right fragment"
        android:layout_gravity="center_horizontal"
        android:textSize="20sp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</LinearLayout>

LeftFragment.java和 RightFragment.java 一样

package com.example.kaige.fragmenttest1;

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

public class LeftFragment extends Fragment {
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.left_fragment,container,false);
        return view;
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="horizontal"
    tools:context="com.example.kaige.fragmenttest1.MainActivity">

    <!--静态碎片使用-->
    <fragment
        android:id="@+id/left_fragment"
        android:name="com.example.kaige.fragmenttest1.LeftFragment"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1" />


    <fragment
        android:id="@+id/right_fragment"
        android:name="com.example.kaige.fragmenttest1.RightFragment"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="2" />

    
</LinearLayout>

MainActivity.java 不用改动

第二种:动态加载Fragment

修改activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="horizontal"
    tools:context="com.example.kaige.fragmenttest1.MainActivity">

    <!--静态碎片使用-->
    <fragment
        android:id="@+id/left_fragment"
        android:name="com.example.kaige.fragmenttest1.LeftFragment"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1" />

    <!--动态添加fragment-->
    <FrameLayout
        android:id="@+id/right_fragment"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1" />
</LinearLayout>

添加

another_right_fragment.xml 和 AnotherRightFragment

<?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:background="#ffff00"
    android:orientation="vertical">

    <TextView
        android:textSize="20sp"
        android:text="This is another right frament"
        android:layout_width="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_height="wrap_content" />
</LinearLayout>

package com.example.kaige.fragmenttest1;

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

/**
 * 动态添加fragment
 */
public class AnotherRightFragment extends Fragment {
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.another_right_fragment, container, false);
        return view;
    }
}

最后修改MainActivity.java

package com.example.kaige.fragmenttest1;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button = (Button) findViewById(R.id.button);
        button.setOnClickListener(this);
        replaceFragment(new RightFragment());
    }
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.button:
                replaceFragment(new AnotherRightFragment());
                break;
        }
    }
    private void replaceFragment(Fragment fragment) {
        FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.replace(R.id.right_fragment, fragment);
        fragmentTransaction.commit();
    }
}

运行看看效果吧..

转载于:https://www.cnblogs.com/412013cl/p/9066229.html