Android-动态加载和静态加载Fragment

Android-动态加载和静态加载Fragment以及通信

Fragment使用非常方便，和Activity功能一样，不过比Activity简捷，在安卓App中很常见。





比如上图，下面四个按钮，每一个对应一个Fragment。

静态加载Fragment

布局文件：

同样也是四个按钮。

<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:orientation="vertical"
tools:context=".MainActivity"
>

<RadioGroup
android:id="@+id/id_radioGroup"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:orientation="horizontal"
android:gravity="center_horizontal"
>

<RadioButton
android:id="@+id/id_one"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@drawable/radio_pressed"
android:button="@null"
android:drawableTop="@mipmap/ic_launcher"
android:gravity="center_horizontal"
android:text="静态加载"
/>

<RadioButton
android:id="@+id/id_two"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@drawable/radio_pressed"
android:button="@null"
android:drawableTop="@mipmap/ic_launcher"
android:gravity="center_horizontal"
android:text="动态加载"
/>

<RadioButton
android:id="@+id/id_three"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@drawable/radio_pressed"
android:button="@null"
android:drawableTop="@mipmap/ic_launcher"
android:gravity="center_horizontal"
android:text="生命周期"
/>

<RadioButton
android:id="@+id/id_four"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@drawable/radio_pressed"
android:button="@null"
android:drawableTop="@mipmap/ic_launcher"
android:gravity="center_horizontal"
android:text="传值通信"
/>

</RadioGroup>

</RelativeLayout>

MyFragment

package com.xieth.as.fragmentdemoone;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

/**
* Created by YR on 2016/03/31.
*/
public class MyFragment extends Fragment{

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

// layout布局文件转换成View对象
View view = inflater.inflate(R.layout.fragment_layout, container, false);
TextView tv = (TextView) view.findViewById(R.id.id_textView_fragment);
tv.setText("静态加载Fragment");
return view;
}
}

fragment_layou.xml

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

<TextView
android:id="@+id/id_textView_fragment"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Fragment"/>

<Button
android:id="@+id/id_btn_fragment"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="按钮"/>

</LinearLayout>

MainActivity2

package com.xieth.as.fragmentdemoone;

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

public class MainActivity2 extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
}

}

activity_main2.xml

<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:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context="com.xieth.as.fragmentdemoone.MainActivity2">

<fragment
android:id="@+id/id_fragment"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:name="com.xieth.as.fragmentdemoone.MyFragment"
/>

</RelativeLayout>

主活动

package com.xieth.as.fragmentdemoone;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.RadioGroup;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements RadioGroup.OnCheckedChangeListener {

private RadioGroup radioGroup = null;

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

initViews();
eventsViews();
}

private void eventsViews() {
radioGroup.setOnCheckedChangeListener(this);
}

private void initViews() {
radioGroup = (RadioGroup) findViewById(R.id.id_radioGroup);
}

@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
switch (checkedId) {
case R.id.id_one:
Intent it = new Intent(this, MainActivity2.class);
startActivity(it);
break;
case R.id.id_two:
Toast.makeText(this, "two", Toast.LENGTH_SHORT).show();
break;
case R.id.id_three:
Toast.makeText(this, "three", Toast.LENGTH_SHORT).show();
break;
case R.id.id_four:
Toast.makeText(this, "four", Toast.LENGTH_SHORT).show();
break;
default:
break;
}
}
}

运行：



动态加载

MyFragment2.java

package com.xieth.as.fragmentdemoone;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

/**
* Created by YR on 2016/03/31.
*/
public class MyFragment2 extends Fragment{

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

// layout布局文件转换成View对象
View view = inflater.inflate(R.layout.fragment_layout, container, false);
TextView tv = (TextView) view.findViewById(R.id.id_textView_fragment);
tv.setText("动态加载Fragment");
return view;
}
}

主活动：

case R.id.id_two:
MyFragment2 myFragment2 = new MyFragment2();
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction beginTransaction =   fragmentManager.beginTransaction();
beginTransaction.add(R.id.id_frame, myFragment2);
beginTransaction.addToBackStack(null);
beginTransaction.commit();
break;

运行：