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Kotlin For Android 笔记（一）

{ super.onCreate(savedInstanceState) val locked : Boolean? = savedInstanceState?....onCreate(savedInstanceState : Bundle?)...{ super.onCreate(savedInstanceState) val locked : Boolean? = savedInstanceState?....{ super.onCreate(savedInstanceState) val locked : Boolean = savedInstanceState!!....{ super.onCreate(savedInstanceState) savedInstanceState?.

6823 0

不需要再手写 onSaveInstanceState 了，因为你的时间非常值钱

@Overridepublic void onSaveInstanceState(Bundle savedInstanceState) { // Save the user's current game...state savedInstanceState.putInt(STATE_SCORE, mCurrentScore); savedInstanceState.putInt(STATE_LEVEL...) { super.onCreate(savedInstanceState); // Always call the superclass first // Check whether...we're recreating a previously destroyed instance if (savedInstanceState !...); mCurrentLevel = savedInstanceState.getInt(STATE_LEVEL); } 解放你的双手上面的方案当然是正确的。

4161 0

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AndroidStudio3 支持 Java8 了，就问你敢用吗

@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);...) { super.onCreate(savedInstanceState); this.setContentView(2131296283); (new Thread...) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main)...) { super.onCreate(savedInstanceState); this.setContentView(2131296283); (new Thread(new...) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); test(()

1.1K1 0

android-懒加载fragment

) { super.onCreateView(savedInstanceState); this.savedInstanceState = savedInstanceState...isInit) { isInit = true; onCreateViewLazy(savedInstanceState);...) { super.onCreate(savedInstanceState); context = getActivity().getApplicationContext...); return contentView; } protected void onCreateView(Bundle savedInstanceState) {...) { super.onCreateViewLazy(savedInstanceState); // 在这里进行初始化控件 findViewById }

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【Android 应用开发】Activity 状态保存 OnSaveInstanceState参数解析

) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } @Override...protected void onRestoreInstanceState(Bundle savedInstanceState) { super.onRestoreInstanceState(savedInstanceState...) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if(savedInstanceState...protected void onRestoreInstanceState(Bundle savedInstanceState) { super.onRestoreInstanceState(savedInstanceState...); System.out.println("onRestoreInstanceState() : " + savedInstanceState.getString("octopus")); }

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Android：保存 & 恢复Activity 状态缓存 - onSaveInstanceState()、onRestoreInstanceState()

使用说明 @Override public void onSaveInstanceState(Bundle savedInstanceState) { // 通过Bundle参数以键值对的方式进行数据的存储...("MyBoolean", true); savedInstanceState.putDouble("myDouble", 1.9); savedInstanceState.putInt...("MyInt", 1); savedInstanceState.putString("MyString", "Welcome back to Android"); //...(savedInstanceState); boolean myBoolean = savedInstanceState.getBoolean("MyBoolean");...double myDouble = savedInstanceState.getDouble("myDouble"); int myInt = savedInstanceState.getInt

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【Android】屏幕翻转导致数据丢失解决方案——数据持久化

) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_save_data);...if(savedInstanceState !...= null){ nickName = savedInstanceState.getString("key_nickName"); age = savedInstanceState.getString...) { super.onRestoreInstanceState(savedInstanceState); nickName = savedInstanceState.getString...= null){ nickName = savedInstanceState.getString("key_nickName"); age = savedInstanceState.getString

2461 0

Activity生命周期

*/ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate...(savedInstanceState); setContentView(R.layout.activity_main); Log.d(TAG, "onCreate");...String test = savedInstanceState.getString("extra_test"); Log.d(TAG, "[onRestoreInstanceState...(savedInstanceState); setContentView(R.layout.activity_second); Log.d(TAG, "onCreate"...); // 可以在onCreate方法内进行数据恢复，但需要判断是否为null if (savedInstanceState !

7323 0

Android代码上减少方法数的一些奇技淫巧

) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); }...) { super.onCreate(savedInstanceState); super.setContentView(R.layout.activity_main);...) { super.onCreate(savedInstanceState); super.setContentView(R.layout.activity_main);...) { super.onCreate(savedInstanceState); super.setContentView(R.layout.activity_main);...) { super.onCreate(savedInstanceState); super.setContentView(R.layout.activity_main);

1K6 0

Java——Object类（基本概念、toString()方法、equals()方法、可以接收所有引用类型）

) { super.onCreate(savedInstanceState); Object obj = new Person(); } } class Person...) { super.onCreate(savedInstanceState); Person per = new Person(); System.out.println...) { super.onCreate(savedInstanceState); Person perA = new Person("阿岚",18); Person...) { super.onCreate(savedInstanceState); Object obj = new int[]{1,2,3}; //向上转型...) { super.onCreate(savedInstanceState); A a = new X();//向上转型 Object obj = a;/

6292 0

Java——代码块（普通块、构造块、静态块）

protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);...protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);...) { super.onCreate(savedInstanceState); Person per1 = new Person(); Person per2...(savedInstanceState); Person per1 = new Person(); Person per2 = new Person(); }...) { super.onCreate(savedInstanceState); System.out.println("hello"); } static

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Java——设计辅助概念（final关键字、对象多态性基本概念）

) { super.onCreate(savedInstanceState); B b = new B(); b.print();...) { super.onCreate(savedInstanceState); fun(new A()); fun(new B());...) { super.onCreate(savedInstanceState); A a = new B(); a.print();...) { super.onCreate(savedInstanceState); A a = new A(); System.out.println...) { super.onCreate(savedInstanceState); A a = new B(); if(a instanceof

6192 0

android ViewPager+Fragment之懒加载

所以我们在第一个Fragment创建成功之后，需要设置下下一个页面是否展示 public void onActivityCreated(Bundle savedInstanceState) {.../ TODO Auto-generated method stub setUserVisibleHint(true); super.onActivityCreated(savedInstanceState...) { super.onCreate(savedInstanceState); } @Override public void onActivityCreated...(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); isViewInitiated...) { super.onCreate(savedInstanceState); title = getArguments().getString("key_fragment_title

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2-AVI--Fragment生命周期测试

) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_life);...) { super.onCreate(savedInstanceState); Log.e(TAG, "onCreate: ====Fragment1"); }...) { super.onActivityCreated(savedInstanceState); Log.e(TAG, "onActivityCreated:====Fragment1...) { super.onCreate(savedInstanceState); Log.e(TAG, "onCreate: >>>>>Fragment2"); }...) { super.onActivityCreated(savedInstanceState); Log.e(TAG, "onActivityCreated:>>>>>Fragment2

8744 0

Android实现计时与倒计时的几种方法

){ super.onCreate(savedInstanceState); setContentView(R.layout.timertask); txtView = (TextView...){ super.onCreate(savedInstanceState); setContentView(R.layout.timertask); txtView = (TextView...) { super.onCreate(savedInstanceState); setContentView(R.layout.timertask); txtView = (TextView...){ super.onCreate(savedInstanceState); setContentView(R.layout.timertask); txtView = (TextView...){ super.onCreate(savedInstanceState); setContentView(R.layout.timertask); txtView = (TextView

1.4K5 1

kotlin recycler_view must not be null

验证为了验证这个想法，分别在onActivityCreated和onViewCreated中做了打印和修改背景颜色的操作 override fun onActivityCreated(savedInstanceState...{ super.onActivityCreated(savedInstanceState) LogUtilKt.i("onActivityCreated--------"...{ super.onViewCreated(view, savedInstanceState) LogUtilKt.i("onViewCreated...")...可能并没有返回，所以就找不到了，所以我们可以把初始化操作放在onActivityCreated或onViewCreated中 override fun onViewCreated(view: View, savedInstanceState...{ super.onViewCreated(view, savedInstanceState) initView() initData() }

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Java——枚举基础应用总结（多例设计模式、Enum类、枚举的实际应用）

public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState...) { super.onCreate(savedInstanceState); Color c = Color.getInstance(1); System.out.println...) { super.onCreate(savedInstanceState); Color c = Color.RED; System.out.println...) { super.onCreate(savedInstanceState); IMessage msg = Color.RED; System.out.println...) { super.onCreate(savedInstanceState); System.out.println(new Person("张三",10,Sex.MALE

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android 监听Button点击的事件的方式

public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState...) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_1);...AppCompatActivity implements View.OnClickListener { @Override protected void onCreate(Bundle savedInstanceState...) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_1);...) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_1); }

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Android使用ViewBinding

{ super.onCreate(savedInstanceState) _binding = getViewBinding() setContentView...{ super.onCreate(savedInstanceState) binding.textView.text = "这是MainActivity" }..., savedInstanceState: Bundle? ): View?...inflater, ViewGroup container, Bundle savedInstanceState) { binding...) { super.onViewCreated(view, savedInstanceState); binding.textView.setText("这是Fragment")

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Android 应用保存状态

) { base.OnRestoreInstanceState(savedInstanceState); _count = savedInstanceState.GetInt("main_activity_click_count...", _count); _myButton.Text = savedInstanceState.GetString("main_activity_button_text", "Nothing in...) { base.OnCreate(savedInstanceState); } public override void OnActivityCreated(Bundle savedInstanceState...) { base.OnActivityCreated(savedInstanceState); } public override View OnCreateView(LayoutInflater..., savedInstanceState); } 经过测试，这种方法最大的缺点就是不靠谱，因为 onSaveInstanceState 和 onResotreInstanceState 不是每次都能被系统调用

1.2K2 0

点击加载更多

Kotlin For Android 笔记（一）

不需要再手写 onSaveInstanceState 了，因为你的时间非常值钱

AndroidStudio3 支持 Java8 了，就问你敢用吗

android-懒加载fragment

【Android 应用开发】Activity 状态保存 OnSaveInstanceState参数解析

Android：保存 & 恢复Activity 状态缓存 - onSaveInstanceState()、onRestoreInstanceState()

【Android】屏幕翻转导致数据丢失解决方案——数据持久化

Activity生命周期

Android代码上减少方法数的一些奇技淫巧

Java——Object类（基本概念、toString()方法、equals()方法、可以接收所有引用类型）

Java——代码块（普通块、构造块、静态块）

Java——设计辅助概念（final关键字、对象多态性基本概念）

android ViewPager+Fragment之懒加载

2-AVI--Fragment生命周期测试

Android实现计时与倒计时的几种方法

kotlin recycler_view must not be null

Java——枚举基础应用总结（多例设计模式、Enum类、枚举的实际应用）

android 监听Button点击的事件的方式

Android使用ViewBinding

Android 应用保存状态

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