DialogFragment和AlertDialog的使用

package com.example.fragments;

import java.lang.ref.WeakReference;
import java.lang.reflect.Field;

import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v4.app.DialogFragment;
import android.support.v4.app.FragmentManager;

/**
 * <p>
 * 关于DialogFragment的使用
 * </p>
 * 下午5:38:45
 * 
 * @auther delvikCoder
 */
public class CustomFragment extends DialogFragment {

	private static Context mContext;
	private AlertDialog alertDialog;

	@Override
	public Dialog onCreateDialog(Bundle savedInstanceState) {

		String str = getArguments().getString("title");

		alertDialog = new AlertDialog.Builder(mContext,
				AlertDialog.THEME_HOLO_LIGHT).setTitle(str)
				.setMessage("这是个测试DialogFragment的列子")
				.setPositiveButton("确定", new OnClickListener() {

					@Override
					public void onClick(DialogInterface dialog, int which) {
					}
				}).setNegativeButton("取消", new OnClickListener() {

					@Override
					public void onClick(DialogInterface dialog, int which) {
					}
				}).setCancelable(false)

				.create();
		setButtonUseless();
		return alertDialog;

	}

	@Override
	public void show(FragmentManager manager, String tag) {
		super.show(manager, tag);
	}

	/**
	 * <p>
	 * 这里利用反射使我们的AlertDialog在没特定使其消失情况下，点击按钮不消失 具体看：<a
	 * href="http://blog.csdn.net/abby_dcy/article/details/6049535">看博客</a>
	 * </p>
	 * void
	 */
	public void setButtonUseless() {

		Field field;

		try {
			field = alertDialog.getClass().getDeclaredField("mAlert");
			field.setAccessible(true);

			Object obj = field.get(alertDialog);

			field = obj.getClass().getDeclaredField("mHandler");
			field.setAccessible(true);

			field.set(obj, new ButtonHandler(null));

		} catch (NoSuchFieldException e) {
			e.printStackTrace();
		} catch (IllegalArgumentException e) {
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		}

	}

	private static final class ButtonHandler extends Handler {
		// Button clicks have Message.what as the BUTTON{1,2,3} constant
		private static final int MSG_DISMISS_DIALOG = 1;

		private WeakReference<DialogInterface> mDialog;

		public ButtonHandler(DialogInterface dialog) {
			mDialog = new WeakReference<DialogInterface>(dialog);
		}

		@Override
		public void handleMessage(Message msg) {
			switch (msg.what) {

			case DialogInterface.BUTTON_POSITIVE:
			case DialogInterface.BUTTON_NEGATIVE:
			case DialogInterface.BUTTON_NEUTRAL:
				((DialogInterface.OnClickListener) msg.obj).onClick(
						mDialog.get(), msg.what);
				break;

			// 下面这两句导致dialog消失
			// case MSG_DISMISS_DIALOG:
			// ((DialogInterface) msg.obj).dismiss();
			}
		}
	}

	/**
	 * <p>
	 * 标题
	 * </p>
	 * 
	 * @param title
	 * @return Fragment
	 */
	public static CustomFragment getFragment(Context context, String title) {

		mContext = context;
		CustomFragment fragment = new CustomFragment();
		Bundle b = new Bundle();
		b.putString("title", title);

		fragment.setArguments(b);

		return fragment;
	}

}

Button btn = (Button) findViewById(R.id.button1ss);
		btn.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {

				CustomFragment customFragment = (CustomFragment) CustomFragment
						.getFragment(MainActivity.this,
								"AlertDialog.THEME_HOLO_LIGHT");

				customFragment.show(getSupportFragmentManager(), "");
			}

		});

然后看几个效果：下面分别对应AlertDialog中的几种Theme

THEME_DEVICE_DEFAULT_LIGHT，THEME_TRADITIONAL，THEME_DEVICE_DEFAULT_DARK，THEME_HOLO_LIGHT









默认AlertDialog不管点击那个按钮都会消失，设置AlertDialog不消失，而有时候我们不想
其消失：

/**
	 * <p>
	 * 这里利用反射使我们的AlertDialog在没特定使其消失情况下，点击按钮不消失 具体看：<a
	 * href="http://blog.csdn.net/abby_dcy/article/details/6049535">看博客</a>
	 * </p>
	 * void
	 */
	public void setButtonUseless() {

		Field field;

		try {
			field = alertDialog.getClass().getDeclaredField("mAlert");
			field.setAccessible(true);

			Object obj = field.get(alertDialog);

			field = obj.getClass().getDeclaredField("mHandler");
			field.setAccessible(true);

			field.set(obj, new ButtonHandler(null));

		} catch (NoSuchFieldException e) {
			e.printStackTrace();
		} catch (IllegalArgumentException e) {
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		}

	}

可以研究下：

static int resolveDialogTheme(Context context, int resid) {
        if (resid == THEME_TRADITIONAL) {
            return com.android.internal.R.style.Theme_Dialog_Alert;
        } else if (resid == THEME_HOLO_DARK) {
            return com.android.internal.R.style.Theme_Holo_Dialog_Alert;
        } else if (resid == THEME_HOLO_LIGHT) {
            return com.android.internal.R.style.Theme_Holo_Light_Dialog_Alert;
        } else if (resid == THEME_DEVICE_DEFAULT_DARK) {
            return com.android.internal.R.style.Theme_DeviceDefault_Dialog_Alert;
        } else if (resid == THEME_DEVICE_DEFAULT_LIGHT) {
            return com.android.internal.R.style.Theme_DeviceDefault_Light_Dialog_Alert;
        } else if (resid >= 0x01000000) {   // start of real resource IDs.
            return resid;
        } else {
            TypedValue outValue = new TypedValue();
            context.getTheme().resolveAttribute(com.android.internal.R.attr.alertDialogTheme,
                    outValue, true);
            return outValue.resourceId;
        }
    }

private AlertController mAlert;