Android Activity加载Fragment的一般简易方法

电玩女神 2024-02-17 16:29 50阅读 0赞

**Android Activity加载Fragment的一般简易方法**

首先写一个布局，布局里面以FrameLayout布局为佳，

然后在上层java代码中创建Fragment进而replace上面的这个FrameLayout：

package com.example.demo;
    
    import android.app.Activity;
    import android.app.Fragment;
    import android.app.FragmentManager;
    import android.app.FragmentTransaction;
    import android.os.Bundle;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.TextView;
    
    public class MainActivity extends Activity {
    
    	@Override
    	protected void onCreate(Bundle savedInstanceState) {
    		super.onCreate(savedInstanceState);
    
    		setContentView(R.layout.activity_main);
    
    		FragmentManager fm = this.getFragmentManager();
    		FragmentTransaction ft = fm.beginTransaction();
    		ft.replace(R.id.fragment, new MyFragment());
    
    		// addToBackStack添加到回退栈,addToBackStack与ft.add(R.id.fragment, new
    		// MyFragment())效果相当
    		// ft.addToBackStack("test");
    
    		ft.commit();
    	}
    
    	private static class MyFragment extends Fragment {
    
    		@Override
    		public void onCreate(Bundle savedInstanceState) {
    			super.onCreate(savedInstanceState);
    		}
    
    		@Override
    		public View onCreateView(LayoutInflater inflater, ViewGroup container,
    				Bundle savedInstanceState) {
    			View view = inflater.inflate(android.R.layout.simple_list_item_1,
    					null);
    			return view;
    		}
    
    		@Override
    		public void onViewCreated(View view, Bundle savedInstanceState) {
    			TextView text = (TextView) view.findViewById(android.R.id.text1);
    			text.setText("hello,world!");
    		}
    	}
    }

如果使用FragmentTransaction的add而不是replace，那么与replcae情况下再加入addToBackStack结果相当。