Android学习历程-Activity生命周期

最新推荐文章于 2025-08-16 22:13:48 发布

转载最新推荐文章于 2025-08-16 22:13:48 发布 · 69 阅读

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/mayzhang/archive/2013/03/21/2972444.html

文章标签：

#移动开发

本文详细介绍了Android中Activity的生命周期，通过三个Activity的具体实现过程，展示了各个生命周期方法的调用顺序及应用场景。此外还提供了布局文件及string.xml和Mainfest.xml配置文件的内容。

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里面写了三个Activity:

package com.example.activity.life.cycle;

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

public class FirstActivity extends Activity {

	private Button button = null;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		System.out.println("FirstActivity---> onCreate");
		super.onCreate(savedInstanceState);
		setContentView(R.layout.first_activity);
		button = (Button)findViewById(R.id.firstButton);
		button.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				Intent intent = new Intent();
				intent.setClass(FirstActivity.this, SecondActivity.class);
				FirstActivity.this.startActivity(intent);
			}
		});
	}

	@Override
	protected void onDestroy() {
		System.out.println("FirstActivity---> onDestroy");
		super.onDestroy();
	}

	@Override
	protected void onPause() {
		System.out.println("FirstActivity---> onPause");
		super.onPause();
	}

	@Override
	protected void onRestart() {
		System.out.println("FirstActivity---> onRestart");
		super.onRestart();
	}

	@Override
	protected void onResume() {
		System.out.println("FirstActivity---> onResume");
		super.onResume();
	}

	@Override
	protected void onStart() {
		System.out.println("FirstActivity---> onStart");
		super.onStart();
	}

	@Override
	protected void onStop() {
		System.out.println("FirstActivity---> onStop");
		super.onStop();
	}

	
}

package com.example.activity.life.cycle;

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

public class SecondActivity extends Activity {

	private Button button = null;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		System.out.println("SecondActivity:>>>>-----  onCreate");
		super.onCreate(savedInstanceState);
		setContentView(R.layout.second_activity);
		button = (Button) findViewById(R.id.secondButton);
		button.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				Intent intent = new Intent();
				intent.setClass(SecondActivity.this, ThirdActivity.class);
				SecondActivity.this.startActivity(intent);
				finish();
			}
		});
	}

	@Override
	protected void onDestroy() {
		System.out.println("SecondActivity:>>>>-----  onDestroy");
		super.onDestroy();
	}

	@Override
	protected void onPause() {
		System.out.println("SecondActivity:>>>>-----  onPause");
		super.onPause();
	}

	@Override
	protected void onRestart() {
		System.out.println("SecondActivity:>>>>-----  onRestart");
		super.onRestart();
	}

	@Override
	protected void onResume() {
		System.out.println("SecondActivity:>>>>-----  onResume");
		super.onResume();
	}

	@Override
	protected void onStart() {
		System.out.println("SecondActivity:>>>>-----  onStart");
		super.onStart();
	}

	@Override
	protected void onStop() {
		System.out.println("SecondActivity:>>>>-----  onStop");
		super.onStop();
	}

}

package com.example.activity.life.cycle;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class ThirdActivity extends Activity {

	private Button button = null;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		System.out.println("ThirdActivity:>>>>-----  onCreate");
		super.onCreate(savedInstanceState);
		setContentView(R.layout.third_acitvity);
		button =(Button)findViewById(R.id.thirdButton);
		button.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				Uri uri = Uri.parse("smsto://08000000123");
				Intent intent = new Intent(Intent.ACTION_SENDTO, uri);
				intent.putExtra("sms_body", "The SMS text");
				ThirdActivity.this.startActivity(intent);
			}
		});
	}

	@Override
	protected void onDestroy() {
		System.out.println("ThirdActivity:>>>>-----  onDestroy");
		super.onDestroy();
	}

	@Override
	protected void onPause() {
		System.out.println("ThirdActivity:>>>>-----  onPause");
		super.onPause();
	}

	@Override
	protected void onRestart() {
		System.out.println("ThirdActivity:>>>>-----  onRestart");
		super.onRestart();
	}

	@Override
	protected void onResume() {
		System.out.println("ThirdActivity:>>>>-----  onResume");
		super.onResume();
	}

	@Override
	protected void onStart() {
		System.out.println("ThirdActivity:>>>>-----  onStart");
		super.onStart();
	}

	@Override
	protected void onStop() {
		System.out.println("ThirdActivity:>>>>-----  onStop");
		super.onStop();
	}

	
}

三个布局文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
    
    <TextView
        android:id="@+id/firstTextView"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/first_activite"
        />
    <Button 
        android:id="@+id/firstButton"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="路转到第二个Activity"/>

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
    
    <TextView
        android:id="@+id/secondTextView"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="第二个activity"
        />
    
    <Button 
        android:id="@+id/secondButton"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="跳轉到ThirdActivity"/>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
    <Button 
        android:id="@+id/thirdButton"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="跳轉到發送信息Activity"/>

</LinearLayout>

string.xml文件：

<resources>

    <string name="app_name">ActivityLifeCycle</string>
    <string name="first_activite">First Activity</string>

</resources>

Mainfest.xml文件：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.activity.life.cycle"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.activity.life.cycle.FirstActivity"
            android:label="第一個Activity" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name="com.example.activity.life.cycle.SecondActivity"
            android:label="第二個Activity" >
        </activity>
        <activity
            android:name="com.example.activity.life.cycle.ThirdActivity"
            android:label="第三個Activity">
        </activity>
    </application>

</manifest>

转载于:https://www.cnblogs.com/mayzhang/archive/2013/03/21/2972444.html