• Activity的生命周期

  Activity Start

  package com.vayne.routertest;
  
  import android.app.Activity;
  import android.os.Bundle;
  import android.support.annotation.Nullable;
  import butterknife.ButterKnife;
  
  /**
  * @Author: chupengda
  * @CreateDate: 2017/8/6
  * @Description: BaseActivity
  */
  public class BaseActivity extends Activity {
  
    /**Activity被創(chuàng)建時(shí)調(diào)用**/
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ButterKnife.bind(this);
    }
  
    /**Activity被創(chuàng)建/從后臺(tái)重新回到前臺(tái)時(shí)調(diào)用**/
    @Override
    protected void onStart() {
        super.onStart();
    }
  
    /**從后臺(tái)重新回到前臺(tái)時(shí)調(diào)用**/
    @Override
    protected void onRestart() {
        super.onRestart();
    }
  
    /**Activity被創(chuàng)建時(shí)被覆蓋后/從后臺(tái)重新回到前臺(tái)時(shí)調(diào)用**/
    @Override
    protected void onResume() {
        super.onResume();
    }
  
    /**此時(shí)Activity is running**/
  
    /**被覆蓋到下面或鎖屏?xí)r調(diào)用**/
    @Override
    protected void onPause() {
        super.onPause();
        //有可能在執(zhí)行完onPause或onStop后,系統(tǒng)資源緊張將Activity殺死,所以有必要在此保存持久數(shù)據(jù)
    }
  
    /**退出Activity/跳轉(zhuǎn)到其他Activity時(shí)調(diào)用**/
    @Override
    protected void onStop() {
        super.onStop();
    }
  
    /**退出Activity時(shí)調(diào)用**/
    @Override
    protected void onDestroy() {
        super.onDestroy();
    }
    
    /**此時(shí)Activity is shutdown**/
  }
  
  

  其他方法
  onSaveInstanceState、onRestoreInstanceState()并不是生命周期方法，它們并不一定會(huì)被觸發(fā)。

  a. onSaveInstanceState當(dāng)應(yīng)用遇到意外情況（如：內(nèi)存不足）由系統(tǒng)銷毀一個(gè)Activity時(shí)，onSaveInstanceState() 會(huì)被調(diào)用。但是當(dāng)用戶主動(dòng)去銷毀一個(gè)Activity時(shí)，例如在應(yīng)用中按返回鍵，onSaveInstanceState()就不會(huì)被調(diào)用。

  b.通常onSaveInstanceState()只適合用于保存一些臨時(shí)性的狀態(tài)，而onPause()適合用于數(shù)據(jù)的持久化保存。

    /**
      *調(diào)用onSaveInstanceState的時(shí)機(jī)總會(huì)發(fā)生在onStop之前，
      *至于調(diào)用時(shí)機(jī)會(huì)不會(huì)發(fā)生在onPause方法之前，
      *那就說不定了，這個(gè)沒有固定的順序可言，
      *正常情況下一般onSaveInstanceState不會(huì)被調(diào)用。
      */
    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        //被摧毀前緩存一些數(shù)據(jù) 
        outState.putString("name", "chupengda");
    }
  
    private String name;
  
    /**
      *在onStart之后調(diào)用
      */
    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        //被重新創(chuàng)建后恢復(fù)緩存的數(shù)據(jù)
        name = savedInstanceState.getString("name"); 
    }   
  

• Fragment的生命周期

  package com.vayne.routertest;
  
  import android.app.Fragment;
  import android.content.Context;
  import android.os.Bundle;
  import android.view.LayoutInflater;
  import android.view.View;
  import android.view.ViewGroup;
  
  /**
   * @Author: chupengda
   * @CreateDate: 2017/8/8
   * @Description:
   */
  
  public class BaseFragment extends Fragment{
  
    /**對(duì)應(yīng)Activity的onCreate**/
  
    /**當(dāng)Fragment與Activity發(fā)生關(guān)聯(lián)時(shí)調(diào)用**/
    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
    }
  
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }
  
    /**創(chuàng)建該Fragment的視圖**/
    @Override
    public View onCreateView(LayoutInflater inflater,ViewGroup container, Bundle savedInstanceState) {
        /**創(chuàng)建視圖的方法
         * View view = inflater.inflate(R.layout.fragment_title, container, false);
         * return view;
         */
        return super.onCreateView(inflater, container, savedInstanceState);
    }
  
    /**宿主Activity創(chuàng)建完畢時(shí)調(diào)用**/
    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
    }
  
    /**其他周期方法
     * onStart()
     * onResume()
     * onPasue()
     * onStop()
     * 同Activity
     * Fragment沒有onRestart()方法
     */
  
    /**對(duì)應(yīng)Activity的onDestroy**/
  
    /**與onCreateView想對(duì)應(yīng)，當(dāng)該Fragment的視圖被移除時(shí)調(diào)用**/
    @Override
    public void onDestroyView() {
        super.onDestroyView();
    }
  
    
    @Override
    public void onDestroy() {
        super.onDestroy();
    }
  
    /**與onAttach相對(duì)應(yīng)，當(dāng)Fragment與Activity關(guān)聯(lián)被取消時(shí)調(diào)用**/
    @Override
    public void onDetach() {
        super.onDetach();
    }
  }
  
  

• Service的生命周期

  主要說明內(nèi)部調(diào)用方法和外部調(diào)用方法的關(guān)系

  • startServic()

    • startServic() 啟用Service服務(wù)

      image

    • stopService() 關(guān)閉Service服務(wù)

      image

  • bindService()

    • bindService() 綁定Service服務(wù)

      image

    • 綁定Service服務(wù)() 解綁Service服務(wù)

      image

  • 注意

    • startService()和stopService()只能開啟和關(guān)閉Service，無法操作Service

    bindService()和unbindService()可以操作Service
    
    

    • startService開啟的Service，調(diào)用者退出后Service仍然存在；

    BindService開啟的Service,調(diào)用者退出后,Service隨著調(diào)用者銷毀
    

End