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
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< 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 > |
right.xml是等会使用fragment的时候,加载的一个布局文件:(由于主要是在界面中加载、所以不作特殊要求)
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<? 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 > |
MyFragment.java就是加载fragment的类,要继承Fragment类:(要重载父类的下边三个方法)
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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(); } } |
MainActivity.java:
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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 ; } } |
演示效果:当点击灰色界面的按钮时显示右侧的布局:
二、第二种方法
项目结构和上图中的差不多:只是在布局文件中,直接使用fragment控件:
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< 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 > |
在myfragment.java文件中,只需找到fragment所容纳的布局文件即可,不进行业务上的操作:
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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(); } } |
MainActivity.java文件:进行fragment的业务处理
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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 ; } } |
总结
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原文链接:https://blog.csdn.net/xlgen157387/article/details/42881789