Fragment 整个生命周期演示

标签：java   android   

Fragment生命周期主要体现在以下表中13个方法里，以下是按照Fragment从开始到销毁的先后执行顺序排序。

下面进行一个demo来观察fragment生命周期，

（1）从启动到显示整个界面：

点击跳转到第二个Actvity时的情况——

可以看到，依次调用onPause() 和 onStop()方法；观察其时间，可以发现就是相差500ms ;

当再次返回到这两个fragment时

当点击返回键，直接回到主界面时，可以看到fragment销毁并退出了

 至此，Fragment的生命周期一览无余。

代码如下：

public class MyFragment1 extends Fragment
{
	private Button button1;
	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState)
	{
		Log.d("Fragment1", "onCreateView");

		View view = inflater.inflate(R.layout.my_fragment1, null);
		Log.d("Fragment1_onCreateView_getActivity_edittext1",
				String.valueOf(getActivity().findViewById(R.id.edittext1)));
		Log.d("Fragment1_onCreateView_view_edittext1",
				String.valueOf(view.findViewById(R.id.edittext1)));
		button1 = (Button)view.findViewById(R.id.button1);

		button1.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				Intent intent = new Intent(getActivity(), MainActivity.class);
				startActivity(intent);
			}
		});
		return view;
	}

	@Override
	public void onInflate(Activity activity, AttributeSet attrs,
			Bundle savedInstanceState)
	{

		Log.d("Fragment1", "onInflate");
		Log.d("Fragment1_onInflate_activity_stringResource", activity
				.getResources().getString(R.string.app_name));
		Log.d("Fragment1_onInflate_class",
				attrs.getAttributeValue(null, "class"));
		Log.d("Fragment1_onInflate_getActivity", String.valueOf(getActivity()));
		Log.d("Fragment1_onInflate_activity_edittext1",
				String.valueOf(activity.findViewById(R.id.edittext1)));
		Log.d("Fragment1_onInflate_savedInstanceState",
				String.valueOf(savedInstanceState));
		super.onInflate(activity, attrs, savedInstanceState);
	}

	@Override
	public void onAttach(Activity activity)
	{
		Log.d("Fragment1", "onAttach");
		Log.d("Fragment1_onAttach_activity_edittext1",
				String.valueOf(activity.findViewById(R.id.edittext1)));
		Log.d("Fragment1_onAttach_getActivity_edittext1",
				String.valueOf(getActivity().findViewById(R.id.edittext1)));
		super.onAttach(activity);
	}

	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		Log.d("Fragment1", "onCreate");
		Log.d("Fragment1_onCreate_getActivity", String.valueOf(getActivity()));
		super.onCreate(savedInstanceState);
		
	}

	@Override
	public void onViewCreated(View view, Bundle savedInstanceState)
	{
		Log.d("Fragment1", "onViewCreated");
		Log.d("Fragment1_onViewCreated_getActivity_edittext1",
				String.valueOf(getActivity().findViewById(R.id.edittext1)));
		Log.d("Fragment1_onViewCreated_view_edittext1",
				String.valueOf(view.findViewById(R.id.edittext1)));

		super.onViewCreated(view, savedInstanceState);
	}

	@Override
	public void onActivityCreated(Bundle savedInstanceState)
	{
		Log.d("Fragment1", "onActivityCreated");
		Log.d("Fragment1_onActivityCreated_getActivity_edittext1",
				String.valueOf(getActivity().findViewById(R.id.edittext1)));
		super.onActivityCreated(savedInstanceState);
	}

	@Override
	public void onStart()
	{
		Log.d("Fragment1", "onStart");
		super.onStart();
	}

	@Override
	public void onResume()
	{
		Log.d("Fragment1", "onResume");
		super.onResume();
	}

	@Override
	public void onPause()
	{
		Log.d("Fragment1", System.currentTimeMillis()+"onPause");
		super.onPause();
	}

	@Override
	public void onStop()
	{
		Log.d("Fragment1", System.currentTimeMillis()+"onStop");
		
		super.onStop();
	}

	@Override
	public void onDestroyView()
	{
		Log.d("Fragment1", "onDestroyView");
		super.onDestroyView();
	}

	@Override
	public void onDestroy()
	{
		Log.d("Fragment1", System.currentTimeMillis()+"onDestroy");
		super.onDestroy();
	}

	@Override
	public void onDetach()
	{
		Log.d("Fragment1", "onDetach");
		super.onDetach();
	}

}

演示Demo 下载

使用Fragmen的好处就是可以把业务逻辑和UI封装在一起，与外部关联系不大，其他程序也可以用该组件，从而实现复用最大化。

Fragment 整个生命周期演示,布布扣,bubuko.com

Fragment 整个生命周期演示

标签：java   android   

原文地址：http://blog.csdn.net/linfeng24/article/details/26491407