Android 基础弹框DataBinding+DialogFragment的使用封装

针对目前弹框的使用比较频繁，现在动手封装一个弹框的基类，使用DataBinding+DialogFragment，希望能够帮到大家。
1.onCreate()方法中添加Style.

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setStyle(STYLE_NORMAL,R.style.BaseDialogStyle);
}

BaseDialogStyle代码如下（大家根据自己的需求进行修改）：

<style name="BaseDialogStyle" parent="Theme.MaterialComponents.DayNight.Dialog">
    <item name="android:windowBackground">@android:color/transparent</item>
    <item name="android:windowFrame">@null</item>
    <item name="android:windowNoTitle">true</item>
    <item name="android:windowFullscreen">true</item>
    <item name="android:windowTranslucentStatus">true</item><!-- 解决全屏时状态栏变黑 -->
    <item name="android:backgroundDimEnabled">true</item>   <!-- 是否允许背景模糊 -->
    <item name="android:windowIsTranslucent">true</item>    <!-- 是否半透明 -->
    <item name="android:windowIsFloating">true</item>       <!-- 是否浮现在activity之上 -->
    <item name="android:windowContentOverlay">@null</item>  <!-- 是否有遮盖 -->
    <item name="android:backgroundDimAmount">0.8</item>     <!-- 设置背景模糊的透明度-->
</style>

2. 弹框核心代码：

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        mContext = getActivity();
        if (getDialog()!=null) getDialog().setCanceledOnTouchOutside(isOnTouchOutSide);
        viewBinding =  DataBindingUtil.inflate(inflater,layoutResId(),container,false);
        viewBinding.setLifecycleOwner(this);
        initData();
        return viewBinding.getRoot();
   }
   

3.在onStart()方法中可以动态设置宽高和透明度以及弹框的位置（上下左右）：

@Override
public void onStart() {
    super.onStart();
   setSite(viewSite);
}

private void setSite(int site) {
    Window mWindow = Objects.requireNonNull(getDialog()).getWindow();
    WindowManager.LayoutParams mLayoutParams = mWindow.getAttributes();
    mLayoutParams.width = windowWidth;
    mLayoutParams.height = windowHeight;
    mLayoutParams.gravity = site;
    mWindow.setAttributes(mLayoutParams);
    mWindow.setDimAmount(alpha);// 0~1 , 1表示完全昏暗
}

4.根据自己的需求封装toast,例如:

protected void showToast(CharSequence msg){
    Toast.makeText(mContext,msg, Toast.LENGTH_SHORT).show();
}

protected void showToast(@StringRes int msg){
    Toast.makeText(mContext,msg, Toast.LENGTH_SHORT).show();
}

5.完整代码如下：

@SuppressLint("ValidFragment")
public abstract class BaseDialog<D extends ViewDataBinding> extends DialogFragment {
protected D viewBinding;
protected Context mContext;
private int viewSite = Gravity.CENTER;//布局位置
private boolean isOnTouchOutSide = false;
private float alpha = 0.8f;
private int windowWidth = ViewGroup.LayoutParams.MATCH_PARENT;
private int windowHeight = ViewGroup.LayoutParams.MATCH_PARENT;
public BaseDialog() {
    super();
}

/**
 * 是否点击外部消失
 * @param isOnTouchOutSide
 */
public BaseDialog(boolean isOnTouchOutSide) {
    this.isOnTouchOutSide = isOnTouchOutSide;
}

/**
 * 布局位置
 * @param site
 */
public BaseDialog(int site) {
    viewSite = site;
}
public BaseDialog(int site, boolean isOnTouchOutSide) {
    this(isOnTouchOutSide);
    viewSite = site;
}

public BaseDialog(float alpha, int windowWidth, int windowHeight) {
    this.alpha = alpha;
    this.windowWidth = windowWidth;
    this.windowHeight = windowHeight;
}

public BaseDialog(int site, int windowWidth, int windowHeight) {
    this.viewSite = site;
    this.windowWidth = windowWidth;
    this.windowHeight = windowHeight;
}
protected abstract @LayoutRes
int layoutResId();

protected abstract void initData();

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setStyle(STYLE_NORMAL,R.style.BaseDialogStyle);
}

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
    mContext = getActivity();
    if (getDialog()!=null){
        getDialog().setCanceledOnTouchOutside(isOnTouchOutSide);
        //禁止返回关闭弹框可在此处处理
//            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
//                getDialog().setOnKeyListener(new DialogInterface.OnKeyListener()   {
//                    @Override
//                    public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {
//                        if (keyCode == 4) return true;
//                        Log.i(TAG, "onKey: "+keyCode);
//                        return false;
//                    }
//                });
//            }
    }
    viewBinding =  DataBindingUtil.inflate(inflater,layoutResId(),container,false);
    viewBinding.setLifecycleOwner(this);
    initData();
    return viewBinding.getRoot();
}

public boolean isOnTouchOutSide() {
    return isOnTouchOutSide;
}

public BaseDialog setOnTouchOutSide(boolean onTouchOutSide) {
    isOnTouchOutSide = onTouchOutSide;
    if (getDialog() != null) {
        getDialog().setCanceledOnTouchOutside(onTouchOutSide);
    }
    return this;
}

public int getViewSite() {
    return viewSite;
}

public BaseDialog setViewSite(int viewSite) {
    this.viewSite = viewSite;
    setSite(viewSite);
    return this;
}

@Override
public void onStart() {
    super.onStart();
   setSite(viewSite);
}

private void setSite(int site) {
    Window mWindow = Objects.requireNonNull(getDialog()).getWindow();
    WindowManager.LayoutParams mLayoutParams = mWindow.getAttributes();
    mLayoutParams.width = windowWidth;
    mLayoutParams.height = windowHeight;
    mLayoutParams.gravity = site;
    mWindow.setAttributes(mLayoutParams);
    mWindow.setDimAmount(alpha);// 0~1 , 1表示完全昏暗
}

protected void showToast(CharSequence msg){
    Toast.makeText(mContext,msg, Toast.LENGTH_SHORT).show();
//        ToastUtils.showShort(mContext,msg);
}

protected void showToast(@StringRes int msg){
    Toast.makeText(mContext,msg, Toast.LENGTH_SHORT).show();
//        ToastUtils.showShort(mContext,msg);
}

最后，希望对大家有所帮助，如果有不对的地方，欢迎大家指正。谢谢！