使用DialogFragment托管dialog

普通的 AlertDialog 在横竖屏切换时会被销毁，如果dialog上面有数据，也将丢失。解决方案是使用DialogFragment（http://developer.android.com/reference/android/app/DialogFragment.html） 。

使用 dialogFragment 通常需要复写两个方法：

onCreateView(LayoutInflater, ViewGroup, Bundle)onCreateDialog(Bundle)

如果你想自定义dialog样式，只需要复写 onCreateView ，注入一个自定义的view即可，然后通过调用DialogFragment#show() 方法即可。

这里我们不需要自定义，只需要托管 AlertDialog 即可,所以我们仅仅需要复写 onCreateDialog 方法。在这个方法内部我们需要通过 AlertDialog.Builder 构建一个dialog并返回，dialog的参数可以通过 setArguments 注入。具体代码如下：

[Java] 纯文本查看 复制代码

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package

com.taobao.dialogfragmentdemo;

import

android.app.Dialog;

import

android.content.DialogInterface;

import

android.os.Bundle;

import

android.support.annotation.NonNull;

import

android.support.v4.app.DialogFragment;

import

android.support.v7.app.AlertDialog;

public

class
AlertDialogFragment extends

DialogFragment

{

private

static
final
String PARAM_TITLE = "title";

private

static
final
String PARAM_CONTENT = "content";

private

static
DialogCallback mCallback;

public

AlertDialogFragment()

{

}

public

static
AlertDialogFragment newInstance(String title,String content,DialogCallback callback)

{

AlertDialogFragment

instance = new

AlertDialogFragment();

Bundle

bundle = new

Bundle();

bundle.putString(PARAM_TITLE,title);

bundle.putString(PARAM_CONTENT,content);

instance.setArguments(bundle);

mCallback

= callback;

return

instance;

}

@NonNull

@Override

public

Dialog onCreateDialog(Bundle savedInstanceState)

{

Bundle

params = getArguments();

AlertDialog.Builder

builder = new

AlertDialog.Builder(getActivity());

builder.setTitle(params.getString(PARAM_TITLE));//没有做非空判断，按需添加

builder.setMessage(params.getString(PARAM_CONTENT));

builder.setPositiveButton("确定",

new

DialogInterface.OnClickListener()

{

  @Override

  public

void
onClick(DialogInterface dialog, int

which)

  {

    if(mCallback

!= null)

      mCallback.onPostiveClick();

  }

});

builder.setNegativeButton("取消",

new

DialogInterface.OnClickListener()

{

  @Override

  public

void
onClick(DialogInterface dialog, int

which)

  {

    if(mCallback

!= null)

      mCallback.onNegativeClick();

  }

});

return

builder.show();

}

public

interface
DialogCallback

{

public

void
onPostiveClick();

public

void
onNegativeClick();

}

}

想使用也很简单：

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AlertDialogFragment
dialog = AlertDialogFragment.newInstance("标题",
"这是fragment托管的alertdialog",
new

AlertDialogFragment.DialogCallback()

{

@Override

public

void
onPostiveClick()

{

Toast.makeText(MainActivity.this,"确定",Toast.LENGTH_SHORT).show();

}

@Override

public

void
onNegativeClick()

{

Toast.makeText(MainActivity.this,"取消",Toast.LENGTH_SHORT).show();

}

});

dialog.show(getSupportFragmentManager(),"dialog");

还可以通过 DialogFragment#show 的第二个参数tag来找到对应的dialogFragment:

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FragmentTransaction
transaction = getSupportFragmentManager().beginTransaction(); Fragment prevDialog = getSupportFragmentManager().findFragmentByTag("dialog");

if(prevDialog
!= null)

{

  transaction.remove(prevDialog);

}