在實(shí)際的開發(fā)當(dāng)中呜叫，我們總是會用到很多公用的方法空繁，可能我們習(xí)慣性的給封裝成一個(gè)公用的代碼塊方法，但其實(shí)開發(fā)一個(gè)APP來說朱庆，界面的交互都是通過activity和fragment來構(gòu)造的家厌，所以我們不妨封裝一個(gè)通用的activity和fragment父類，讓所有的activity和fragment都集成其中椎工，而在使用這些通用的方法的時(shí)候也方便我們直接去引用
封裝的方法有很多，但基本上都是大同小異维蒙，這里我們?nèi)ナ褂胿iewBing，沒有原因殖熟，因?yàn)橄矚g钳榨，哈哈哈，那什么是viewBinding呢饼齿？沒有比官方文檔更詳細(xì)的介紹了，有興趣的話可以具體的看看
View Binding是Android Studio 3.6推出的新特性吃型，目的是為了替代findViewById(內(nèi)部實(shí)現(xiàn)還是使用findViewById)勤晚。运翼。在啟動視圖綁定后血淌，系統(tǒng)會為改模塊中的每個(gè)xml文件生成一個(gè)綁定類悠夯，綁定類的實(shí)例包含對在相應(yīng)布局中具有 ID 的所有視圖的直接引用沦补。
View Binding 的優(yōu)點(diǎn)
1夕膀、Null 安全：由于視圖綁定會創(chuàng)建對視圖的直接引用产舞，因此不存在因視圖 ID 無效而引發(fā) Null 指針異常的風(fēng)險(xiǎn)易猫。此外准颓，如果視圖僅出現(xiàn)在布局的某些配置中，則綁定類中包含其引用的字段會使用 @Nullable 標(biāo)記炮赦。
2眼五、類型安全：每個(gè)綁定類中的字段均具有與它們在 XML 文件中引用的視圖相匹配的類型看幼。這意味著不存在發(fā)生類轉(zhuǎn)換異常的風(fēng)險(xiǎn)诵姜。
接下來就是進(jìn)行我們的封裝方法了棚唆，首先需要在我們的項(xiàng)目去啟用viewBinding
android{
//使用viewBinding
buildFeatures {
viewBinding = true
}
}
然后就是封裝我們的基類了，從官方的來說其實(shí)很簡單
protected VB binding;
binding = getViewBinding();
setContentView(binding.getRoot());
其實(shí)總體來說只有三行代碼瞎惫，其他的便是我們自己的拓展功能，這里不做過多贅述乘寒，直接上干貨
BaseActivity
public abstract class BaseAppCompatActivity<VB extends ViewBinding> extends AppCompatActivity
implements View.OnClickListener {
public static final int NON_CODE = -1;
/*獲取屏幕信息*/
protected int mScreenWidth = 0;
protected int mScreenHeight = 0;
protected float mScreenDensity = 0.0f;
protected Context mContext = null;
protected ImmersionBar mImmersionBar;
protected VB binding;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//傳參
Bundle extras = getIntent().getExtras();
if (null != extras) {
getBundleExtras(extras);
}
//注冊EventBus
if (isBindEventBusHere()) {
EventBus.getDefault().register(this);
Log.e("eventBus", "register");
}
mContext = this;
// 加入到Activity棧
BaseAppManager.getInstance().addActivity(this);
/* 獲取屏幕信息 */
DisplayMetrics displayMetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
mScreenDensity = displayMetrics.density;
mScreenHeight = displayMetrics.heightPixels;
mScreenWidth = displayMetrics.widthPixels;
if (isImmersionBarEnabled()) {
initImmersionBar();
}
binding = getViewBinding();
setContentView(binding.getRoot());
if (hasTitleBar()) {
setCustomTitle(getTitle());
onTitleBarBackClick();
}
initViewsAndEvents();
addListener();
}
protected void initImmersionBar() {
mImmersionBar = ImmersionBar.with(this);
mImmersionBar.init();
if (ImmersionBar.isSupportStatusBarDarkFont())
mImmersionBar.statusBarDarkFont(true).keyboardEnable(true).init();
}
//綁定標(biāo)題欄
protected boolean hasTitleBar() {
return findViewById(R.id.title_bar) != null;
}
//設(shè)置標(biāo)題title
protected void setCustomTitle(CharSequence title) {
if (hasTitleBar()) {
TextView titleView = findViewById(R.id.title_tv_message);
if (titleView != null) {
titleView.setText(title);
setTitle("");
}
}
}
//獲取標(biāo)題欄返回鍵
protected void onTitleBarBackClick() {
if (hasTitleBar()) {
ImageButton backView = findViewById(R.id.actionbar_back);
if (backView != null) {
backView.setOnClickListener(v -> finish());
}
}
}
/**
* 是否可以使用沉浸式
*/
protected boolean isImmersionBarEnabled() {
return true;
}
/**
* bind layout resource file
*/
protected abstract VB getViewBinding();
/**
* init activity view and bind event
*/
protected abstract void initViewsAndEvents();
/**
* 是否注冊EventBus
*/
protected boolean isBindEventBusHere() {
return false;
}
protected void getBundleExtras(Bundle extras) {
}
/**
* 給 View 控件添加點(diǎn)擊事件監(jiān)聽器
*/
protected void addListener() {
}
/**
* view的點(diǎn)擊事件
* 屏蔽快速點(diǎn)擊而引發(fā)的問題
*/
protected void onWidgetClick(View view) {
}
private long lastTime = 0L;
private View currentView = null;
@Override
public void onClick(View view) {
long nowTime = System.currentTimeMillis();
if (nowTime - lastTime > 1000L || view.getId() == currentView.getId()) {
lastTime = nowTime;
currentView = view;
onWidgetClick(view);
}
}
/**
* startActivity
*
* @param clazz target Activity
*/
protected void go(Class<? extends Activity> clazz) {
_goActivity(clazz, null, NON_CODE, false);
}
/**
* startActivity with bundle
*
* @param clazz target Activity
*/
protected void go(Class<? extends Activity> clazz, Bundle bundle) {
_goActivity(clazz, bundle, NON_CODE, false);
}
/**
* startActivity then finish this
*
* @param clazz target Activity
*/
protected void goAndFinish(Class<? extends Activity> clazz) {
_goActivity(clazz, null, NON_CODE, true);
}
/**
* startActivity with bundle and then finish this
*
* @param clazz target Activity
* @param bundle bundle extra
*/
protected void goAndFinish(Class<? extends Activity> clazz, Bundle bundle) {
_goActivity(clazz, bundle, NON_CODE, true);
}
/**
* startActivityForResult
*/
protected void goForResult(Class<? extends Activity> clazz, int requestCode) {
_goActivity(clazz, null, requestCode, false);
}
/**
* startActivityForResult with bundle
*/
protected void goForResult(Class<? extends Activity> clazz, Bundle bundle, int requestCode) {
_goActivity(clazz, bundle, requestCode, false);
}
/**
* startActivityForResult then finish this
*/
protected void goForResultAndFinish(Class<? extends Activity> clazz, int requestCode) {
_goActivity(clazz, null, requestCode, true);
}
/**
* startActivityForResult with bundle and then finish this
*/
protected void goForResultAndFinish(Class<? extends Activity> clazz, Bundle bundle, int requestCode) {
_goActivity(clazz, bundle, requestCode, true);
}
@Override
public void setContentView(int layoutResID) {
super.setContentView(layoutResID);
}
@Override
public void finish() {
super.finish();
InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
if (imm != null) {
imm.hideSoftInputFromWindow(getWindow().getDecorView().getWindowToken(), 0);
}
BaseAppManager.getInstance().removeActivity(this);
}
@Override
protected void onDestroy() {
if (isBindEventBusHere()) {
EventBus.getDefault().unregister(this);
Log.e("eventBus", "unregister");
}
if (mImmersionBar != null) {
mImmersionBar.destroy();
}
BaseAppManager.getInstance().removeActivity(this);
super.onDestroy();
}
/**
* Activity 跳轉(zhuǎn)
*
* @param clazz 目標(biāo)activity
* @param bundle 傳遞參數(shù)
* @param finish 是否結(jié)束當(dāng)前activity
*/
private void _goActivity(Class<? extends Activity> clazz, Bundle bundle, int requestCode, boolean finish) {
if (null == clazz) {
throw new IllegalArgumentException("you must pass a target activity where to go.");
}
Intent intent = new Intent(this, clazz);
intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
if (null != bundle) {
intent.putExtras(bundle);
}
if (requestCode > NON_CODE) {
startActivityForResult(intent, requestCode);
} else {
startActivity(intent);
}
if (finish) {
finish();
}
}
}
BaseFragment
public abstract class BaseFragment<VB extends ViewBinding> extends Fragment
implements View.OnClickListener {
private static final int NON_CODE = -1;
protected Context mContext;
protected VB binding;
//加載布局
protected abstract VB getViewBinding(LayoutInflater inflater, ViewGroup viewGroup);
protected abstract void initViewsAndEvents();
/*是否綁定eventbus事件* */
protected boolean isBindEventBusHere() {
return false;
}
@Override
public void onAttach(@NonNull Context context) {
super.onAttach(context);
mContext = context;
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (isBindEventBusHere()) {
EventBus.getDefault().register(this);
}
}
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
binding = getViewBinding(inflater, container);
return binding.getRoot();
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
//屏幕適配
DisplayMetrics displayMetrics = new DisplayMetrics();
getActivity().getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
initViewsAndEvents();
addListener();
}
@Override
public void onDestroyView() {
super.onDestroyView();
if (isBindEventBusHere()) {
EventBus.getDefault().unregister(this);
}
}
/**
* 給 View 控件添加點(diǎn)擊事件監(jiān)聽器
*/
protected void addListener() {
}
protected void onWidgetClick(View view) {
}
private long lastTime = 0L;
private View currentView = null;
@Override
public void onClick(View view) {
long nowTime = System.currentTimeMillis();
if (nowTime - lastTime > 1000L || view.getId() == currentView.getId()) {
lastTime = nowTime;
currentView = view;
onWidgetClick(view);
}
}
/**
* startActivity
*
* @param clazz target Activity
*/
protected void go(Class<? extends Activity> clazz) {
_goActivity(clazz, null, NON_CODE, false);
}
/**
* startActivity with bundle
*
* @param clazz target Activity
*/
protected void go(Class<? extends Activity> clazz, Bundle bundle) {
_goActivity(clazz, bundle, NON_CODE, false);
}
protected void goForResult(Class<? extends Activity> clazz, int requestCode) {
_goActivity(clazz, null, requestCode, false);
}
protected void goForResult(Class<? extends Activity> clazz, Bundle bundle, int requestCode) {
_goActivity(clazz, bundle, requestCode, false);
}
/**
* Activity 跳轉(zhuǎn)
*
* @param clazz 目標(biāo)activity
* @param bundle 傳遞參數(shù)
* @param finish 是否結(jié)束當(dāng)前activity
*/
private void _goActivity(Class<? extends Activity> clazz, Bundle bundle, int requestCode, boolean finish) {
if (null == clazz) {
throw new IllegalArgumentException("you must pass a target activity where to go.");
}
Intent intent = new Intent(getActivity(), clazz);
intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
if (null != bundle) {
intent.putExtras(bundle);
}
if (requestCode > NON_CODE) {
startActivityForResult(intent, requestCode);
} else {
startActivity(intent);
}
if (finish) {
getActivity().finish();
}
}
}
因?yàn)檫@里我們使用了一個(gè)偽沉浸式狀態(tài)欄鸠澈，所以需要在application的子節(jié)點(diǎn)下添加我們的APP的整體樣式际度，這里直接貼上style
<style name="AppTheme.NoActionBar" parent="Theme.AppCompat.Light.NoActionBar">
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
</style>
