android之activity生命周期图

package good.go;

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

public class TestProcActivity extends Activity {
    /** Called when the activity is first created. */

    private Button btn = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Toast.makeText(getApplicationContext(), "on create", 2000).show();

        btn = (Button) findViewById(R.id.good);
        btn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Intent i = new Intent();
                i.setClass(TestProcActivity.this, num.class);
                startActivity(i);
            }
        });

    }

    @Override
    protected void onStart() {
        // TODO Auto-generated method stub
        Toast.makeText(getApplicationContext(), "on start", 2000).show();
        super.onStart();
    }

    @Override
    protected void onRestart() {
        // TODO Auto-generated method stub
        Toast.makeText(getApplicationContext(), "on restart", 2000).show();
        super.onRestart();
    }

    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        Toast.makeText(getApplicationContext(), "on resume", 2000).show();
        super.onResume();
    }

    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        Toast.makeText(getApplicationContext(), "on pause", 2000).show();
        super.onPause();
    }

    @Override
    protected void onStop() {
        // TODO Auto-generated method stub
        Toast.makeText(getApplicationContext(), "on stop", 2000).show();
        super.onStop();
    }

    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        Toast.makeText(getApplicationContext(), "on destory", 2000).show();
        super.onDestroy();
    }

}

package good.go;

import android.app.*;
import android.os.*;
import android.widget.Toast;

public class num extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        Toast.makeText(getApplicationContext(), "num --on create", 2000).show();
        super.onCreate(savedInstanceState);
    }

    @Override
    protected void onStart() {
        // TODO Auto-generated method stub
        Toast.makeText(getApplicationContext(), "num --on start", 2000).show();
        super.onStart();
    }

    @Override
    protected void onRestart() {
        // TODO Auto-generated method stub
        Toast.makeText(getApplicationContext(), "num --on restart", 2000)
                .show();
        super.onRestart();
    }

    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        Toast.makeText(getApplicationContext(), "num --on resume", 2000).show();
        super.onResume();
    }

    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        Toast.makeText(getApplicationContext(), "num --on pause", 2000).show();
        super.onPause();
    }

    @Override
    protected void onStop() {
        // TODO Auto-generated method stub
        Toast.makeText(getApplicationContext(), "num --on stop", 2000).show();
        super.onStop();
    }

    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        Toast.makeText(getApplicationContext(), "num --on destroy", 2000)
                .show();
        super.onDestroy();
    }

}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="good.go"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="7" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".TestProcActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".num"
            android:label="@string/app_name"
            android:theme="@android:style/Theme.Dialog" >
        </activity>
    </application>

</manifest>

 无论在一个activity中哪个函数中调用 startactivity，都会经历一个活动状态的变迁过程，而不是立即跳转到别的activity中执行，所以了解android的

生命周期的过程，对了解程序的执行和分布是很有意义的。

原图连接： http://blog.csdn.net/android_tutor/article/details/5772285

最好的是在写程序的时候    加上与调试相关的代码，这样能避免一些自己想不到的错误。 同时也能帮助自己理解生命周期这个概念。