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组件--Fragment(碎片)第二篇详解

maogefff 原文

感觉之前看的还是不清楚，重新再研究了一次

Fragment常用的三个类：

android.app.Fragment 主要用于定义Fragment

android.app.FragmentManager 主要用于在Activity中操作Fragment

android.app.FragmentTransaction 保证一些列Fragment操作的原子性，熟悉事务这个词，一定能明白~

1. 静态调用（就充当普通的控件）

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="viewpagerindicator.com.fragmentstatic">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>

</manifest>

 activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >
    <!--静态调用fragment的方法:
    就是相当于把fragment当做一个Button或者EditText之类的空间
    其中name就相当于普通空间的ID-->
    <fragment
        android:layout_width="match_parent"
        android:layout_height="45dp"
        android:id="@+id/fragment1"
        android:name="viewpagerindicator.com.fragmentstatic.FragmentTittle"/>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="区隔按键"/>

    <fragment
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/fragment_context_id"
        android:name="viewpagerindicator.com.fragmentstatic.FragmentContext"/>


</LinearLayout>

fragment_tittle.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="45dp"
    android:orientation="horizontal">

    <Button
        android:text="按键"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/bt1"
        android:textSize="15sp"
        />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="测试FRAGMENT"
        android:gravity="center"
        />
</RelativeLayout>

fragment_content.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="horizontal">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/colorAccent"
        android:text="显示区域"
        android:textSize="40dp"
        android:gravity="center"/>
</LinearLayout>


MainActivity.java
package viewpagerindicator.com.fragmentstatic;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;

public class MainActivity extends AppCompatActivity {
    final  String TAG = "MainActivity";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

    }
}
FragmentTittle.java
package viewpagerindicator.com.fragmentstatic;

import android.app.Fragment;
import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.AttributeSet;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Toast;

public class FragmentTittle extends Fragment {

    Button mLeftMenu;
    final String TAG = "FragmentTittle";
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState)
    {
        View view = inflater.inflate(R.layout.fragment_tittle, container, false);
        mLeftMenu = (Button) view.findViewById(R.id.bt1);
        mLeftMenu.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(getActivity(), "按键点击事件", Toast.LENGTH_SHORT).show();
            }
        });
        return view;
    }
}
FragmentContext.java
package viewpagerindicator.com.fragmentstatic;

import android.app.Fragment;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class FragmentContext extends Fragment {

    final String TAG = "FragmentContext";
    //Button mLeftMenu;

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState)
    {
        View view = inflater.inflate(R.layout.fragment_content, container, false);
        //mLeftMenu = (Button) view.findViewById(R.id.bt1);
        return view;
    }
}

 

2. 动态调用

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