android 点击返回键 以及 加载activity 生命周期 记录。。。，一目了然

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();   
    }

简单的说，

   当activity 启动的时候会启动以下方法，按先后顺序

onCreate->onStart->onResume->onPostResume

当按返回的时候，也就是结束这个Activity的时候，先后顺序是：

onPase->onStop->onDestroy