使用DialogFragment托管dialog

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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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packagecom.taobao.dialogfragmentdemo;
importandroid.app.Dialog;
importandroid.content.DialogInterface;
importandroid.os.Bundle;
importandroid.support.annotation.NonNull;
importandroid.support.v4.app.DialogFragment;
importandroid.support.v7.app.AlertDialog;
publicclass AlertDialogFragment extendsDialogFragment
{
  privatestatic final String PARAM_TITLE = "title";
  privatestatic final String PARAM_CONTENT = "content";
  privatestatic DialogCallback mCallback;
  publicAlertDialogFragment()
  {
  }
  publicstatic AlertDialogFragment newInstance(String title,String content,DialogCallback callback)
  {
    AlertDialogFragment instance = newAlertDialogFragment();
    Bundle bundle = newBundle();
    bundle.putString(PARAM_TITLE,title);
    bundle.putString(PARAM_CONTENT,content);
    instance.setArguments(bundle);
    mCallback = callback;
    returninstance;
  }
  @NonNull
  @Override
  publicDialog onCreateDialog(Bundle savedInstanceState)
  {
    Bundle params = getArguments();
    AlertDialog.Builder builder = newAlertDialog.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",newDialogInterface.OnClickListener()
    {
      @Override
      publicvoid onClick(DialogInterface dialog, intwhich)
      {
        if(mCallback != null)
          mCallback.onPostiveClick();
      }
    });
    builder.setNegativeButton("取消",newDialogInterface.OnClickListener()
    {
      @Override
      publicvoid onClick(DialogInterface dialog, intwhich)
      {
        if(mCallback != null)
          mCallback.onNegativeClick();
      }
    });
    returnbuilder.show();
  }
  publicinterface DialogCallback
  {
    publicvoid onPostiveClick();
    publicvoid 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",newAlertDialogFragment.DialogCallback()
{
  @Override
  publicvoid onPostiveClick()
  {
    Toast.makeText(MainActivity.this,"确定",Toast.LENGTH_SHORT).show();
  }
  @Override
  publicvoid 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);
 }

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