DialogFragment

转载：http://blog.csdn.net/lmj623565791/article/details/37815413

1、 概述

DialogFragment在android 3.0时被引入。是一种特殊的Fragment，用于在Activity的内容之上展示一个模态的对话框。典型的用于：展示警告框，输入框，确认框等等。
在DialogFragment产生之前，我们创建对话框：一般采用AlertDialog和Dialog。注：官方不推荐直接使用Dialog创建对话框。

2、 好处与用法

使用DialogFragment来管理对话框，当旋转屏幕和按下后退键时可以更好的管理其声明周期，它和Fragment有着基本一致的声明周期。且DialogFragment也允许开发者把Dialog作为内嵌的组件进行重用，类似Fragment（可以在大屏幕和小屏幕显示出不同的效果）。上面会通过例子展示这些好处~

使用DialogFragment至少需要实现onCreateView或者onCreateDIalog方法。onCreateView即使用定义的xml布局文件展示Dialog。onCreateDialog即利用AlertDialog或者Dialog创建出Dialog。

3,重写onCreatView创建Dialog

创建弹窗dialog

public class ConcreteDialogFragment extends DialogFragment{@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {View view=inflater.inflate(R.layout.dialog_fragment,null);return view;}}

xml文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <EditText         android:id="@+id/name_ed"        android:minEms="5"        android:hint="EditText"        android:layout_width="wrap_content"        android:layout_height="wrap_content"/>    <Button         android:id="@+id/button"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="button"/></LinearLayout>

activity中点击按钮触发：

button.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {ConcreteDialogFragment dialogFragment=new ConcreteDialogFragment();FragmentManager manager=getSupportFragmentManager();dialogFragment.show(manager, "DialogFragmentActivity");}});

运行结果如下：

去掉标题：

public class ConcreteDialogFragment extends DialogFragment{@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {View view=inflater.inflate(R.layout.dialog_fragment,null);<strong>getDialog().requestWindowFeature(Window.FEATURE_NO_TITLE);</strong>return view;}}

4，在onCreateDialog中 创建Dialog

@Overridepublic Dialog onCreateDialog(Bundle savedInstanceState) {AlertDialog.Builder builder=new AlertDialog.Builder(getActivity());LayoutInflater inflater=LayoutInflater.from(getActivity());AlertDialog alertDialog=builder.setView(inflater.inflate(R.layout.dialog_fragment,null)).setPositiveButton("Sign In", new OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {Toast.makeText(getActivity(), "Sign In", Toast.LENGTH_SHORT).show();}}).create();return alertDialog;}

示意图：

5，传递数据给Activity

使用接口：

在fragment定义接口

TranslateListener translateListener;@Overridepublic void onAttach(Activity activity) {<strong>translateListener=(TranslateListener) activity;</strong>super.onAttach(activity);}<strong>public interface TranslateListener{void showMsg(String msg);}</strong>@Overridepublic Dialog onCreateDialog(Bundle savedInstanceState) {AlertDialog.Builder builder=new AlertDialog.Builder(getActivity());LayoutInflater inflater=LayoutInflater.from(getActivity());AlertDialog alertDialog=builder.setView(inflater.inflate(R.layout.dialog_fragment,null)).setPositiveButton("Sign In", new OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {<strong>translateListener.showMsg("translateListener");</strong>Toast.makeText(getActivity(), "Sign In", Toast.LENGTH_SHORT).show();}}).create();return alertDialog;}

activity实现接口：

public class DialogFragmentActivity extends BaseActivity <strong>implements TranslateListener</strong>{<strong>@Overridepublic void showMsg(String msg) {showToast(this, msg);</strong>}@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Button button=(Button) findViewById(R.id.button01);button.setText("show DialogFragment");button.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {ConcreteDialogFragment dialogFragment=new ConcreteDialogFragment();FragmentManager manager=getSupportFragmentManager();dialogFragment.show(manager, "DialogFragmentActivity");}});}}