Android的activity的生命周期

最新推荐文章于 2025-03-25 14:15:39 发布

转载最新推荐文章于 2025-03-25 14:15:39 发布 · 137 阅读

文章标签：

#Android

Android 专栏收录该内容

12 篇文章

订阅专栏

本文通过一个具体的Android应用实例，深入解析了Android活动（Activity）的生命周期，包括MainActivity、NormalActivity和DialogActivity的创建、启动、恢复、暂停、停止、销毁及重启等各个阶段，并展示了如何通过日志记录来观察这些生命周期的状态变化。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

可以使用以下代码查看Log，来查看生命周期：

MainActivity:
package com.example.lenovo.activitylifecycletest;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    public static final String TAG="MainActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.d(TAG, "onCreate");
        setContentView(R.layout.activity_main);
        Button startNormalActivity = (Button) findViewById(R.id.start_normal_activity);
        Button startDialogActivity = (Button) findViewById(R.id.start_dialog_activity);
        if(savedInstanceState!=null){
            String tempData=savedInstanceState.getString("data_key");
            Log.d(TAG,tempData);
        }
        startNormalActivity.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, NormalActivity.class);
                startActivity(intent);
            }
        });

        startDialogActivity.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, DialogActivity.class);
                startActivity(intent);
                }
            });
        }
        @Override
        protected void onStart(){
            super.onStart();
            Log.d(TAG,"onStart");
        }
        @Override
        protected void onResume(){
            super.onResume();
            Log.d(TAG,"onResume");
        }
        @Override
        protected void onPause(){
            super.onPause();
            Log.d(TAG,"onPause");
        }
        @Override
        protected void onStop(){
            super.onStop();
            Log.d(TAG,"onStop");
        }
        @Override
        protected void onDestroy(){
            super.onDestroy();
            Log.d(TAG,"onDestroy");
        }
        @Override
        protected void onRestart(){
            super.onRestart();
            Log.d(TAG,"onRestart");
        }
}


NormalActivity:
package com.example.lenovo.activitylifecycletest;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class NormalActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.normal_layout);
    }
}
DialogActivity:
package com.example.lenovo.activitylifecycletest;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class DialogActivity extends AppCompatActivity {

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