Android的Activity生命周期（原）

package mars.activity04;

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 implements OnClickListener{
    private Button btn1;
    private Button btn2;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.first);
        btn1 = (Button)findViewById(R.id.Btn1);
        btn2 = (Button)findViewById(R.id.Btn2);
        btn1.setOnClickListener(this);
        btn2.setOnClickListener(this);
        System.out.println("FirstAcvity-------------------------->onCreate");
    }
    @Override
    protected void onStart() {
        // TODO Auto-generated method stub
        super.onStart();
        System.out.println("FirstAcvity-------------------------->onStart");
    }
    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        System.out.println("FirstAcvity-------------------------->onResume");
    }
    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
        System.out.println("FirstAcvity-------------------------->onPause");
    }
    @Override
    protected void onStop() {
        // TODO Auto-generated method stub
        super.onStop();
        System.out.println("FirstAcvity-------------------------->onStop");
    }
    @Override
    protected void onRestart() {
        // TODO Auto-generated method stub
        super.onRestart();
        System.out.println("FirstAcvity-------------------------->onRestart");
    }
    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        System.out.println("FirstAcvity-------------------------->onDestroy");
    }
    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        switch(v.getId()){
        case R.id.Btn1:
            Intent intent = new Intent();
            intent.setClass(this,SecondActivity.class);
            startActivity(intent);
            break;
        case R.id.Btn2:
            this.finish();
            System.out.println("FirstAcvityfinish-------------------------->");
            break;
        }
    }
}

public class SecondActivity extends Activity implements OnClickListener {
    private Button btn1;
    private Button btn2;
    private Button btn3;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.second);
        btn1 = (Button)findViewById(R.id.backbtn);
        btn2 = (Button)findViewById(R.id.thirdButton);
        btn3 = (Button)findViewById(R.id.finish2);
        btn1.setOnClickListener(this);
        btn2.setOnClickListener(this);
        btn3.setOnClickListener(this);
        System.out.println("SecondActivity-------------------------->onCreate");
        
    }
    @Override
    protected void onStart() {
        // TODO Auto-generated method stub
        super.onStart();
        System.out.println("SecondAcvity-------------------------->onStart");
    }
    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        System.out.println("SecondAcvity-------------------------->onResume");
    }
    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
        System.out.println("SecondAcvity-------------------------->onPause");
    }
    @Override
    protected void onStop() {
        // TODO Auto-generated method stub
        super.onStop();
        System.out.println("SecondAcvity-------------------------->onStop");
    }
    @Override
    protected void onRestart() {
        // TODO Auto-generated method stub
        super.onRestart();
        System.out.println("SecondAcvity-------------------------->onRestart");
    }
    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        System.out.println("SecondAcvity-------------------------->onDestroy");
    }
    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        switch(v.getId()){
        case R.id.backbtn:
            Intent intent1 = new Intent();
            intent1.setClass(this,FirstActivity.class);
            startActivity(intent1);
            break;
        case R.id.thirdButton:
            Intent intent2 = new Intent();
            intent2.setClass(this,ThirdActivity.class);
            startActivity(intent2);
            break;
        case R.id.finish2:
            this.finish();
            System.out.println("SecondAcvityfinish-------------------------->");
            break;
        }
    }
}

public class ThirdActivity extends Activity implements OnClickListener{
    private Button btn;
    private Button btn2;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.third);
        btn=(Button)findViewById(R.id.backToSecondButton);
        btn2=(Button)findViewById(R.id.finish3);
        btn.setOnClickListener(this);
        btn2.setOnClickListener(this);
        System.out.println("ThirdAcvity-------------------------->onCreate");
    }
    @Override
    protected void onStart() {
        // TODO Auto-generated method stub
        super.onStart();
        System.out.println("ThirdAcvity-------------------------->onStart");
    }
    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        System.out.println("ThirdAcvity-------------------------->onResume");
    }
    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
        System.out.println("ThirdAcvity-------------------------->onPause");
    }
    @Override
    protected void onStop() {
        // TODO Auto-generated method stub
        super.onStop();
        System.out.println("ThirdAcvity-------------------------->onStop");
    }
    @Override
    protected void onRestart() {
        // TODO Auto-generated method stub
        super.onRestart();
        System.out.println("ThirdAcvity-------------------------->onRestart");
    }
    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        System.out.println("ThirdAcvity-------------------------->onDestroy");
    }
    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        switch(v.getId()){
        case R.id.backToSecondButton:
            Intent intent=new Intent();
            intent.setClass(this, SecondActivity.class);
            startActivity(intent);
            break;
        case R.id.finish3:
            this.finish();
            System.out.println("ThirdAcvityfinish-------------------------->");
            break;
        }
    }