系统中所有对话框，默认布局方式都是居中显示

                if(SystemProperties.get("EXTERNAL_STORAGE_VIRTUAL_STATE").trim().equals("virtual")&&
                SystemProperties.get("EXTERNAL_SD_STATE").trim().equals("insert")){

系统中所有对话框，默认布局方式都是居中显示，如果想自定义显示位置可以考虑如下方式：
……
Window mWindow = dialog.getWindow();
    WindowManager.LayoutParams lp = mWindow.getAttributes();
    lp.x= xxx;
    lp.y= xxx;

缺省居中lp.x=0,lp.y=0

     新坐标 x小于0左移，大于0右移；y小于0上移，大于0下移


        @Override
protected void onDestroy() {
super.onDestroy();
android.os.Process.killProcess(android.os.Process.myPid());
}



    public static String wrap(String str, int wrapLength, String newLineStr, boolean wrapLongWords) {
        if (str == null) {
            return null;
        }
        if (newLineStr == null) {
            newLineStr = System.getProperty("line.separator");
        }
        if (wrapLength < 1) {
            wrapLength = 1;
        }
        int inputLineLength = str.length();
        int offset = 0;
        StringBuffer wrappedLine = new StringBuffer(inputLineLength + 32);
       
        while ((inputLineLength - offset) > wrapLength) {
            if (str.charAt(offset) == ' ') {
                offset++;
                continue;
            }
            int spaceToWrapAt = str.lastIndexOf(' ', wrapLength + offset);

            if (spaceToWrapAt >= offset) {
                // normal case
                wrappedLine.append(str.substring(offset, spaceToWrapAt));
                wrappedLine.append(newLineStr);
                offset = spaceToWrapAt + 1;
               
            } else {
                // really long word or URL
                if (wrapLongWords) {
                    // wrap really long word one line at a time
                    wrappedLine.append(str.substring(offset, wrapLength + offset));
                    wrappedLine.append(newLineStr);
                    offset += wrapLength;
                } else {
                    // do not wrap really long word, just extend beyond limit
                    spaceToWrapAt = str.indexOf(' ', wrapLength + offset);
                    if (spaceToWrapAt >= 0) {
                        wrappedLine.append(str.substring(offset, spaceToWrapAt));
                        wrappedLine.append(newLineStr);
                        offset = spaceToWrapAt + 1;
                    } else {
                        wrappedLine.append(str.substring(offset));
                        offset = inputLineLength;
                    }
                }
            }
        }

        // Whatever is left in line is short enough to just pass through
        wrappedLine.append(str.substring(offset));

        return wrappedLine.toString();
    }