运行

1.运行查看

?可知启动程序先掉用这三个方法

2.点击按钮"Start NormalActivity"

从MainAtivity跳转到NormalActivity

?在logcat中,Maintivity先调用onPause方法暂停,再调用onStop方法进入停止状态

?3.点击返回后

从停止状态到正常状态

4..点击按钮"START DIALOGACTIVITY"后

?进入暂停状态

?5.在安卓虚拟机中退出后

代码

结构

XML

activity_main.xml

<?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"
    >
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center">
        <Button
            android:id="@+id/bt_normal"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:text="Start NormalActivity"/>
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center">
        <Button
            android:id="@+id/bt_dialog"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:text="Start DialogActivity"/>
    </LinearLayout>


</LinearLayout>

acticity_dialog.xml

<?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"
    >
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center">
        <Button

            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:text="Start NormalActivity"/>
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center">
        <Button

            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:text="Start DialogActivity"/>
    </LinearLayout>


</LinearLayout>

activity_normal.xml

<?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"
    >
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center">
        <TextView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:text="This is a normal activity"/>
    </LinearLayout>



</LinearLayout>

strings.xml

<resources>
    <string name="app_name">LifeCycle</string>
    <string name="title_activity_dialog">This is dialog activity</string>
</resources>

活动类

MainActivity

package com.star.lifecycle;


import android.util.Log;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MainActivity";
    Button btNor,btDialog;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.d(TAG, "onCreate");

        btNor = findViewById(R.id.bt_normal);
        btDialog = findViewById(R.id.bt_dialog);

        btNor.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(MainActivity.this,NormalActivity.class);

                startActivity(intent);
            }
        });

        btDialog.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                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.star.lifecycle;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

public class NormalActivity extends AppCompatActivity {

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

DialogActivity

package com.star.lifecycle;

import androidx.appcompat.app.AppCompatActivity;

import android.app.Activity;
import android.os.Bundle;

public class DialogActivity extends Activity {

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

    }
}