简单程序用于熟悉Activity生命周期

public class FirstActivity extends Activity {
/** Called when the activity is first created. */
private Button myButton;
@Override
public void onCreate(Bundle savedInstanceState) {
System.out.println("FirstAcvity ---> onCreate");
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
myButton = (Button)findViewById(R.id.myButton);
myButton.setText("启动第二个Activity");
myButton.setOnClickListener(new ButtonOnClickListener());
}

@Override
protected void onDestroy() {
// TODO Auto-generated method stub
System.out.println("FirstAcvity --->onDestory");
super.onDestroy();
}

@Override
protected void onPause() {
// TODO Auto-generated method stub
System.out.println("FirstAcvity --->onPause");
super.onPause();
}

@Override
protected void onRestart() {
// TODO Auto-generated method stub
System.out.println("FirstAcvity --->onRestart");
super.onRestart();
}

@Override
protected void onResume() {
// TODO Auto-generated method stub
System.out.println("FirstAcvity --->onResume");
super.onResume();
}

@Override
protected void onStart() {
// TODO Auto-generated method stub
System.out.println("FirstAcvity --->onStart");
super.onStart();
}

@Override
protected void onStop() {
// TODO Auto-generated method stub
System.out.println("FirstAcvity --->onStop");
super.onStop();
}

class ButtonOnClickListener implements OnClickListener{

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

}

}

public class SecondActivity extends Activity {

private Button secondButton;
@Override
protected void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub
System.out.println("SecondActivity--->onCreate");
super.onCreate(savedInstanceState);
setContentView(R.layout.second);
secondButton = (Button)findViewById(R.id.secondButton);
Gallery g = (Gallery)findViewById(R.id.secondButton);
secondButton.setOnClickListener(new ButtonOnClickListener());

}

@Override
protected void onDestroy() {
// TODO Auto-generated method stub
System.out.println("SecondActivity--->onDestory");
super.onDestroy();
}

@Override
protected void onPause() {
// TODO Auto-generated method stub
System.out.println("SecondActivity--->onPause");
super.onPause();
}

@Override
protected void onRestart() {
// TODO Auto-generated method stub
System.out.println("SecondActivity--->onRestart");
super.onRestart();
}

@Override
protected void onResume() {
// TODO Auto-generated method stub
System.out.println("SecondActivity--->onResume");
super.onResume();
}

@Override
protected void onStart() {
// TODO Auto-generated method stub
System.out.println("SecondActivity--->onStart");
super.onStart();
}

@Override
protected void onStop() {
// TODO Auto-generated method stub
System.out.println("SecondActivity--->onStop");
super.onStop();
}
class ButtonOnClickListener implements OnClickListener{

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

}
}