Android加载loading对话框的功能及实例代码(不退出沉浸式效果)

public class LoadingDialog extends Dialog {
  public LoadingDialog(Context context) {
    super(context);
  }
  public LoadingDialog(Context context, int theme) {
    super(context, theme);
  }
   @Override
  public void show() {
    //在show之前添加禁止获取焦点
    this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE, WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);
    super.show();
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
      int uiOptions = View.SYSTEM_UI_FLAG_LAYOUT_STABLE
          | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
          | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
          | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
          | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
          | View.SYSTEM_UI_FLAG_FULLSCREEN;
      this.getWindow().getDecorView().setSystemUiVisibility(uiOptions);
    }
    //在show之后取消禁止获取焦点属性，否则会导致dialog无法处理点击
    this.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);
  }
}

private WindowManager mwWindowManager;
private FrameLayout mForewarnLayout;
private boolean isShowing = false;
/**显示全屏的加载动画*/
public void alertLoadingDialog(){
  if (!isShowing){
    mForewarnLayout = (FrameLayout) LayoutInflater.from(getApplicationContext())
        .inflate(R.layout.view_loading, null, false);
    // 获取window管理对象
    mwWindowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
    // 设置布局参数
    WindowManager.LayoutParams forewarnLayoutParams = new WindowManager.LayoutParams();
    forewarnLayoutParams.type = WindowManager.LayoutParams.TYPE_PHONE; // 设置window TYPE
    forewarnLayoutParams.format = PixelFormat.RGBA_8888; // 设置图片格式，效果位背景透明
    // 设置Window flag
    forewarnLayoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
        | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
    forewarnLayoutParams.gravity = Gravity.LEFT | Gravity.TOP; //
    // 调整悬浮窗口至左上角，便于调整坐标
    // 设置悬浮窗口长宽数据
    forewarnLayoutParams.width = WindowManager.LayoutParams.MATCH_PARENT;
    forewarnLayoutParams.height = WindowManager.LayoutParams.MATCH_PARENT;
    // forewarnLayoutParams.windowAnimations = R.style.anim_view;// 添加进入动画
    // 添加布局视图
    mwWindowManager.addView(mForewarnLayout, forewarnLayoutParams);
    isShowing = true;
  }
}
/**取消全屏的加载动画*/
public void dismissTwo() {
  if (isShowing) {
    mwWindowManager.removeViewImmediate(mForewarnLayout);
    isShowing = false;
  }
}

uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />