Android Activity的生命周期

Android Activity生命周期详解

最新推荐文章于 2025-03-25 14:15:39 发布

原创最新推荐文章于 2025-03-25 14:15:39 发布 · 98 阅读

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文章标签：

#Android #OS

本文深入解析了Android Activity的生命周期，包括启动、暂停、重启、停止和销毁等关键状态的变化过程，以及如何通过生命周期回调实现相应的操作。

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1. 启动Activity：onCreate()->onStart()->onResume()->Activity is running

2. 按back键返回：onPause()->onStop()->onDestroy() 再次启动时:onCreate()->onStart()->onResume()->Activity is running

3.按home键返回：onPause()->onStop() 再次启动时：onRestart()->onStart()->onResume()->Activity is running

4.切换到别的Activity（当前Activity不finish）： onPause()->onStop() 再次启动时:onCreate()->onStart()->onResume()->Activity is running

5.切换到别的Activity（当前Activity finish）： onPause()->onStop()->onDestroy() 再次启动时:onCreate()->onStart()->onResume()->Activity is running

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package com.Aina.Android;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;

public class Test_CeShi extends Activity {
	/** Called when the activity is first created. */
	private int i = 1;
	private Button btn;
	/**
	 * 创建
	 */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		Log.i("TAG-onCreate", "onCreate()------------" + (i++));
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		btn = (Button) this.findViewById(R.id.Button01);
		btn.setOnClickListener(new Button.OnClickListener(){

			@Override
			public void onClick(View v) {
				Intent intent = new Intent(Test_CeShi.this,fg.class);
				Test_CeShi.this.startActivity(intent);
//				Test_CeShi.this.finish();
			}

		});
	}

	/**
	 * 重新开始
	 */
	@Override
	protected void onRestart() {
		Log.i("TAG-onRestart", "onRestart()------------" + (i++));
		super.onRestart();
	}

	/**
	 * 启动
	 */
	@Override
	protected void onStart() {
		Log.i("TAG-onStart", "onStart()------------" + (i++));

		super.onStart();
	}

	/**
	 * 重新启动
	 */
	@Override
	protected void onResume() {
		Log.i("TAG-onResume", "onResume()------------" + (i++));
		super.onResume();
	}

	/**
	 * 暂停
	 */
	@Override
	protected void onPause() {
		Log.i("TAG-onPause", "onPause()------------" + (i++));

		super.onPause();
	}

	/**
	 * 停止
	 */
	@Override
	protected void onStop() {
		Log.i("TAG-onStop", "onStop()------------" + (i++));
		super.onStop();
	}

	/**
	 * 销毁
	 */
	@Override
	protected void onDestroy() {
		Log.i("TAG-onDestroy", "onDestroy()------------" + (i++));
		super.onDestroy();
	}

}