简洁的BP及RBF神经网络代码

 <!-- 对话框主题 -->
    <style name="DialogTheme" parent="@android:style/Theme.Dialog">
        <item name="android:windowBackground">@android:color/transparent</item>
        <item name="android:windowNoTitle">true</item>
    </style>

package com.wwj.custom.dialog;

import android.app.Dialog;
import android.content.Context;
import android.content.res.Resources;
import android.util.DisplayMetrics;
import android.view.Gravity;
import android.view.Window;
import android.view.WindowManager;

/**
 * 自定义对话框
 * 
 * @author wwj
 * 
 */
public class CustomDialog extends Dialog {
	private static int default_width = 160; // 默认宽度
	private static int default_height = 120;// 默认高度

	public CustomDialog(Context context) {
		super(context);
	}

	public CustomDialog(Context context, int layout, int style) {
		this(context, default_width, default_height, layout, style);
	}

	public CustomDialog(Context context, int width, int height, int layout,
			int style) {
		super(context, style);
		// 设置内容
		setContentView(layout);
		// 设置窗口属性
		Window window = getWindow();
		WindowManager.LayoutParams params = window.getAttributes();
		// 设置宽度、高度、密度、对齐方式
		float density = getDensity(context);
		params.width = (int) (width * density);
		params.height = (int) (height * density);
		params.gravity = Gravity.CENTER;
		window.setAttributes(params);

	}

	/**
	 * 获取显示密度
	 * 
	 * @param context
	 * @return
	 */
	public float getDensity(Context context) {
		Resources res = context.getResources();
		DisplayMetrics dm = res.getDisplayMetrics();
		return dm.density;
	}
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/dialog_bg"
    android:gravity="center"
    android:orientation="vertical" >

    <ProgressBar
        style="@style/DialogTheme"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/message"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="5dp"
        android:text="正在执行..." />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >

    <corners android:radius="10dp" />

    <solid android:color="#55000000" />

</shape>

package com.wwj.custom.dialog;

import android.app.Activity;
import android.os.Bundle;

/**
 * 1.修改系统默认的Dialog样式（风格、主题）
 * 
 * 2.自定义Dialog布局文件
 * 
 * 3.可以自己封装一个类，继承自Dialog或者直接使用Dialog类来实现，为了方便以后重复使用，建议自己封装一个Dialog类
 * 
 * @author wwj
 * 
 */
public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		CustomDialog customDialog = new CustomDialog(this,
				R.layout.dialog_layout, R.style.DialogTheme);
		customDialog.show();
	}

}