简叙 Activity 生命周期及android 返回按钮捕捉

@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);    //To change body of overridden methods use File | Settings | File Templates.
}

@Override
protected void onStart() {
System.out.println("---------------onStart---------------");
super.onStart();    //To change body of overridden methods use File | Settings | File Templates.
}

@Override
protected void onRestart() {
System.out.println("---------------onRestart---------------");
super.onRestart();    //To change body of overridden methods use File | Settings | File Templates.
}

@Override
protected void onResume() {
System.out.println("---------------onResume---------------");
super.onResume();    //To change body of overridden methods use File | Settings | File Templates.
}

@Override
protected void onPostResume() {
System.out.println("---------------onPostResume---------------");
super.onPostResume();    //To change body of overridden methods use File | Settings | File Templates.
}

@Override
protected void onPause() {
System.out.println("---------------onPause---------------");
super.onPause();    //To change body of overridden methods use File | Settings | File Templates.
}

@Override
protected void onStop() {
System.out.println("---------------onStop---------------");
super.onStop();    //To change body of overridden methods use File | Settings | File Templates.
}

@Override
protected void onDestroy() {
System.out.println("---------------onDestroy---------------");
super.onDestroy();    //To change body of overridden methods use File | Settings | File Templates.
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
if(keyCode== KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0){
Toast.makeText(_context,"点击了返回【onKeyDown】",Toast.LENGTH_LONG).show();
System.out.println("---------------onKeyDown---------------");
this.onBackPressed();
return true; //确认返回了
}
return false;  //不允许返回
}

@Override
public void onBackPressed() {

Toast.makeText(_context,"点击了返回【onBackPressed】",Toast.LENGTH_LONG).show();
System.out.println("---------------onBackPressed---------------");
super.onBackPressed();
}