Android学习笔记之Fragment的两种使用方法

标签：android学习笔记之fragment   fragment   

一、第一种方法：

（1）Fragment的第一种使用方法是使用fragment加载单独的布局文件：（也就是xml的方式实现）

结构如下：

activity_main.xml主要是在一个线性布局中添加两个线性布局

<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=".MainActivity" >

    <LinearLayout
        android:id="@+id/linerlayout1"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:background="#CCCCCC"
        android:orientation="vertical" >

        <Button
            android:id="@+id/button1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="显示窗口" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/linerlayout2"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="3"
        android:background="#CCFFDD"
        android:orientation="vertical" >
    </LinearLayout>

</LinearLayout>

<?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" >

    <RatingBar
        android:id="@+id/ratingBar1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <Button
        android:id="@+id/button11"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="点我试试" />

</LinearLayout>

package com.lc.tablet_fragment_addview;

import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Toast;

public class MyFragment extends Fragment {

	public MyFragment() {
		// TODO Auto-generated constructor stub
	}

	@Override
	public void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		// 这里的R.layout.right是界面的id
		View view = inflater.inflate(R.layout.right, null);
		Button button = (Button) view.findViewById(R.id.button11);
		button.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				Toast.makeText(getActivity(), "hello world!", Toast.LENGTH_LONG)
						.show();
			}
		});
		return view;
	}

	@Override
	public void onPause() {
		// TODO Auto-generated method stub
		super.onPause();
	}
}

package com.lc.tablet_fragment_addview;

import android.app.Activity;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {

	private Button button;
	private FragmentManager fragmentManager; // 管理
	private FragmentTransaction fragmentTransaction; // 事务

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

		button = (Button) this.findViewById(R.id.button1);
		fragmentManager = getFragmentManager();

		button.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				fragmentTransaction = fragmentManager.beginTransaction();
				MyFragment myFragment = new MyFragment();
				// 第一个参数是要放到哪个地方的id，第二个为要放入的fragment
				fragmentTransaction.add(R.id.linerlayout2, myFragment);
				fragmentTransaction.commit();
			}
		});
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}

二、第二种方法

<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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <fragment
        android:id="@+id/fragment1"
        android:name="com.example.tablet_fragment_fragementmanager.MyFragment"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="37dp" />

</RelativeLayout>

package com.example.tablet_fragment_fragementmanager;

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

public class MyFragment extends Fragment {

	public MyFragment() {
	}

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		/*
		 * 这里只需找到布局文件即可
		 */
		View view = inflater.inflate(R.layout.text, null);
		return view;
	}

	@Override
	public void onResume() {
		super.onResume();
	}

}

package com.example.tablet_fragment_fragementmanager;

import android.app.Activity;
import android.app.FragmentManager;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

/*
 * 再布局文件中拖入一个fragment、则使用下边的方法来找到特定的fragment
 * 不需要使用beginTransaction方法
 */
public class MainActivity extends Activity {

	private MyFragment fragment;
	private FragmentManager fragmentManager;
	private Button button;

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

		fragmentManager = getFragmentManager();
		// 使用fragmentManager找到fragment、使用ID作为唯一的标识符
		fragment = (MyFragment) fragmentManager
				.findFragmentById(R.id.fragment1);

		// 或者使用下边的方法找到fragment

		// fragment =(MyFragment)fragmentManager.findFragmentByTag("fragment1");

		// 找到fragment布局中的按钮button1
		button = (Button) fragment.getView().findViewById(R.id.button1);
		button.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				Toast.makeText(MainActivity.this, "hello world!",
						Toast.LENGTH_SHORT).show();
			}
		});
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}

Android学习笔记之Fragment的两种使用方法

标签：android学习笔记之fragment   fragment   

原文地址：http://blog.csdn.net/xlgen157387/article/details/42881789