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;@Overridepublic 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() {@Overridepublic void onClick(DialogInterface dialog, int which) {}}).setNegativeButton("取消", new OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {}}).setCancelable(false).create();setButtonUseless();return alertDialog;}@Overridepublic 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} constantprivate static final int MSG_DISMISS_DIALOG = 1;private WeakReference<DialogInterface> mDialog;public ButtonHandler(DialogInterface dialog) {mDialog = new WeakReference<DialogInterface>(dialog);}@Overridepublic 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() {@Overridepublic 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;