Fragment总结

一、总体工程图：

二、main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:baselineAligned="false"
    android:orientation="vertical" >

    <fragment
        android:id="@+id/fragment1"
        android:name="com.jltxgcy.fragmentdemo.Fragment1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1" />

   <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/main_layout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:baselineAligned="false"
    android:layout_weight="1" >

	</LinearLayout>
    <TextView 
        android:id="@+id/tv_display"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</LinearLayout>

三、fragment1.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#00ff00" >
    <TextView
        android:id="@+id/tv_fragment1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="This is fragment 1"
        android:textColor="#000000"
        android:textSize="25sp" />

</LinearLayout>

四、fragment2.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ffff00" >

    <TextView
        android:id="@+id/tv_fragment2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="This is fragment 2"
        android:textColor="#000000"
        android:textSize="25sp" />

</LinearLayout>

五、MainActivity.java

package com.jltxgcy.fragmentdemo;

import android.os.Bundle;
import android.app.Activity;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;

public class MainActivity extends FragmentActivity {
	public static final String TAG = "Fragment2";
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Fragment2 fragment2 = new Fragment2();  
        getSupportFragmentManager().beginTransaction().replace(R.id.main_layout, fragment2).commit();
    }
    
    public void testMainActivity(){
    	Fragment1 fragment1 = (Fragment1) getSupportFragmentManager().findFragmentById(R.id.fragment1);
		fragment1.testFragment1();
    }
    
    public void testFindviewById(){
    	findViewById(R.id.tv_display);
    	findViewById(R.id.tv_fragment2);
    }
}

六、Fragment1.java

package com.jltxgcy.fragmentdemo;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class Fragment1 extends Fragment {
	
	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
		return inflater.inflate(R.layout.fragment1, container, false);
	}
	
	public void testFragment1(){
		Log.d("jltxgcy", "testFragment1");
	}
}

七、Fragment2.java

package com.jltxgcy.fragmentdemo;

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

public class Fragment2 extends Fragment {
	private ViewGroup mViewGroup;

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
		mViewGroup = container;
		testFragment2();
		return inflater.inflate(R.layout.fragment2, container, false);
	}
	
	public void testFragment2(){
		MainActivity mainActivity = (MainActivity)getActivity();
		mainActivity.testMainActivity();
		Fragment1 fragment1 = (Fragment1) getFragmentManager().findFragmentById(R.id.fragment1);
		fragment1.testFragment1();
	}
	
	public void testFindviewById(){
		mViewGroup.findViewById(R.id.tv_fragment2);
		getActivity().findViewById(R.id.tv_display);
		getActivity().findViewById(R.id.tv_fragment1);
	}

}

八、上面分别介绍了动态和静态加载Fragment的过程。

        Activity中获取自身控件View:findViewById(R.id.tv_display);

        Activity中获取Fragment控件View:findViewById(R.id.tv_fragment2);

        Activity中使用Fragment方法：

        Fragment1 fragment1 = (Fragment1) getSupportFragmentManager().findFragmentById(R.id.fragment1); 

        fragment1.testFragment1();

        Fragment中获取自身控件View:mViewGroup.findViewById(R.id.tv_fragment2);

        Fragment中获取Activity控件View:getActivity().findViewById(R.id.tv_display);

        Fragment中获取其他控件Fragment的View:getActivity().findViewById(R.id.tv_fragment1);

        Fragment中使用Activity中的方法：

        MainActivity mainActivity = (MainActivity)getActivity();
        mainActivity.testMainActivity();

        Fragment中使用其他Fragment中的方法：

        Fragment1 fragment1 = (Fragment1) getFragmentManager().findFragmentById(R.id.fragment1);
        fragment1.testFragment1();

九、程序运行最后结果为：

         

   代码地址：https://github.com/jltxgcy/Demo

代码地址：https://github.com/jltxgcy/Demo