public static Dialog creatRequestDialog(final Context context, String tip) {        final Dialog dialog = new Dialog(context, R.style.dialog);        // dialog.setCancelable(false);        // dialog.setCanceledOnTouchOutside(false);        dialog.setContentView(R.layout.dialog_layout);        Window window = dialog.getWindow();        WindowManager.LayoutParams lp = window.getAttributes();        int width = Utils.getScreenWidth(context);        lp.width = (int) (0.5 * width);        TextView titleTxtv = (TextView) dialog.findViewById(R.id.tvLoad);        titleTxtv.setText(tip);        return dialog;       }

<style name="dialog" parent="@android:style/Theme.Dialog">        <item name="android:windowIsFloating">true</item>        <!-- 设置未浮动窗口 -->        <item name="android:windowFrame">@null</item>        <!-- 设置无边框 -->        <item name="android:windowNoTitle">true</item>        <!-- 设置无标题 -->        <item name="android:windowBackground">@color/sc_transparent_background</item>        <!-- 设置完全透明 -->        <item name="android:backgroundDimEnabled">true</item>        <!-- 设置屏幕变暗 -->    </style>

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="@drawable/loading_bg"    android:gravity="center_horizontal"    android:orientation="vertical"    android:paddingBottom="15dp"    android:paddingLeft="20dp"    android:paddingRight="20dp"    android:paddingTop="15dp" >    <ProgressBar        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:indeterminateDrawable="@drawable/frame_loading" />    <TextView        android:id="@+id/tvLoad"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:paddingTop="5dp"        android:textColor="#ffffffff"        android:textSize="17.0sp" /></LinearLayout>

public void showRequestDialog(String msg) {        if (mDialog != null) {            mDialog.dismiss();            mDialog = null;        }        mDialog = DialogFactory.creatRequestDialog(this, msg);        // mDialog.setCancelable(false);        mDialog.setCanceledOnTouchOutside(false);//防止4.0系统点击dialog之外时出现崩溃问题         mDialog.show();    }    //关闭Dialogpublic void closeRequestDialog() {      if (mDialog != null) {            mDialog.dismiss();            mDialog = null;       }    }    //回退    @Override    public void onBackPressed() {        super.onBackPressed();        finish();    }