Dialog在Fragment中居中显示

妖狐艹你老母 2022-03-15 04:12 291阅读 0赞

转载请注明链接：[https://blog.csdn.net/feather\_wch/article/details/88042877][https_blog.csdn.net_feather_wch_article_details_88042877]

> 如今一个需求Dialog正好处于一个播放窗口(Fragment)的正中央，原始Dialog的Center属性只能位于窗口的中央，无法满足需求。

# Dialog在Fragment中居中显示 #

版本：2019/2/28-20:02

--------------------

## 源码 ##

1.  Dialog的代码自己实现。
2.  通过DialogUtils在show之前进行调整。

// 1、传入Dialog、Fragment、true
    DialogUtils.setDialogInFragmentsCenter(mDialog, MyFragment.this, true);
    // 2、展示Dialog
    mDialog.show();

### 状态栏的处理 ###

1、具有状态栏，且状态为全屏模式。

DialogUtils.setDialogInFragmentsCenter(mDialog, MyFragment.this, true);

2、没有状态栏(如手机横屏进行全屏播放)、有状态栏但是不会使用到状态栏的区域

DialogUtils.setDialogInFragmentsCenter(mDialog, MyFragment.this, false);

### DialogUtils ###

1、DialogUtils.java源码

/**======================================= * @author 猎羽 * @function 让Dialog处于指定Fragment的正中间 *=======================================*/
    
    public class DialogUtils
    { 
    
        private static final String TAG = DialogUtils.class.getName();
    
        /** * * @param dialog * @param fragment * @param hasStatusBar 该页面是否具有statusBar。有，在不包括状态栏的区域居中；没有，在该整个区域居中。 */
        public static void setDialogInFragmentsCenter(Dialog dialog, Fragment fragment, final boolean hasStatusBar){ 
    
            // 1、获取Dialog所述的Window，以及LayoutParams(布局参数)
            final Window dialogWindow = dialog.getWindow();
            dialogWindow.setFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE, WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);
            final WindowManager.LayoutParams lp = dialogWindow.getAttributes();
    
            // 2、获取到Fragment所处的View
            final View fragmentView = fragment.getView();
            // 3、获取到Dialog的DecorView
            final View dialogView = dialogWindow.getDecorView();
            dialogView.setVisibility(View.INVISIBLE);
            dialogView.post(new Runnable()
            { 
                @Override
                public void run()
                { 
                    // 4、获取到Fragment左上角点的距离整个屏幕的距离
                    int[] location = new int[2];
                    fragmentView.getLocationOnScreen(location);
                    int fragmentWidth = fragmentView.getMeasuredWidth();
                    int fragmentHeight = fragmentView.getMeasuredHeight();
    
    
                    // 5、获取到Dialog的宽高
                    int dialogWith = dialogView.getMeasuredWidth();
                    int dialogHeight = dialogView.getMeasuredHeight();
    
                    // 6、获取到标题栏的宽高
                    int mStatusBarHeight = 0;
    
                    if(hasStatusBar){ 
                        // 有状态栏，需要去除状态栏的影响。
                        mStatusBarHeight = StatusBarCompat.getStatusBarHeight();
                    }
    
    
                    // 7、Dialog从左上角开始排
                    dialogWindow.setGravity(Gravity.START | Gravity.TOP);
                    // x = fragment的x + fragment宽度/2 - Dialog宽度/2
                    lp.x = location[0] + fragmentWidth / 2 - dialogWith / 2;
                    // y = fragment的y + fragment高度/2 - Dialog高度/2 - 状态栏高度(Gravity.TOP会自动偏移状态栏的高度)
                    lp.y = location[1] + fragmentHeight / 2 - dialogHeight / 2 - mStatusBarHeight;
    
                    // 8、设置Window的属性
                    dialogWindow.setAttributes(lp);
                    // 9、展示出Dialog
                    dialogView.setVisibility(View.VISIBLE);
    
                    LogEx.d(TAG, "x = " + location[0] + " y = " + location[1] + " width = " + fragmentWidth + " height = " + fragmentHeight);
                    LogEx.d(TAG, "lp.x = " + lp.x + " lp.y = " + lp.y);
                    LogEx.d(TAG, "dialogWith = " + dialogWith + " dialogHeight = " + dialogHeight);
                }
            });
        }
    }

2、获取状态栏高度

public static int getStatusBarHeight()
    { 
        /** * 获取状态栏高度——方法2 * */
        int statusBarHeight = -1;
        try
        { 
            Class<?> clazz = Class.forName("com.android.internal.R$dimen");
            Object object = clazz.newInstance();
            int height = Integer.parseInt(clazz.getField("status_bar_height")
                    .get(object).toString());
            statusBarHeight = BaseApp.getInstance().getApplicationContext().getResources().getDimensionPixelSize(height);
        }
        catch (Exception e)
        { 
            e.printStackTrace();
        }
        LogEx.e(tag, "状态栏-方法2:" + statusBarHeight);
        return statusBarHeight;
    }

[https_blog.csdn.net_feather_wch_article_details_88042877]: https://blog.csdn.net/feather_wch/article/details/88042877