DialogFragment是Android 3.0新增的Fragment子类,他的Package在android.app.DialogFragment 中,Dialog和Android常规的Dialog是不同的实现方法。
一、常规对话框
public static class MyDialogFragment extends DialogFragment {
int mNum;
static MyDialogFragment newInstance(int num) {
MyDialogFragment f = new MyDialogFragment();
Bundle args = new Bundle();
args.putInt("num", num);
f.setArguments(args);
return f;
}
下面是Fragment的onCreate方法,需要注意的是,设置布局不在这里,和Activity有些不同。
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mNum = getArguments().getInt("num");
int style = DialogFragment.STYLE_NORMAL, theme = 0;
switch ((mNum-1)%6) {
case 1: style = DialogFragment.STYLE_NO_TITLE; break;
case 2: style = DialogFragment.STYLE_NO_FRAME; break;
case 3: style = DialogFragment.STYLE_NO_INPUT; break;
case 4: style = DialogFragment.STYLE_NORMAL; break;
case 5: style = DialogFragment.STYLE_NORMAL; break;
}
switch ((mNum-1)%6) {
case 4: theme = android.R.style.Theme_Light; break;
case 5: theme = android.R.style.Theme; break;
}
setStyle(style, theme);
}
在Fragment设置布局在onCreateView中,使用inflater可以映射一个xml方式布局的layout文件。
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_dialog, container, false);
View tv = v.findViewById(R.id.text);
((TextView)tv).setText("Dialog #" + mNum + ": using style "
+ getNameForNum(mNum));
Button button = (Button)v.findViewById(R.id.show);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
((FragmentDialog)getActivity()).showDialog(); //显示fragmentdialog
}
});
return v;
}
}
上面的showDialog方法在Activity中的定义如下:
void showDialog() {
mStackLevel++;
FragmentTransaction ft = getFragmentManager().beginTransaction();
Fragment prev = getFragmentManager().findFragmentByTag("dialog");
if (prev != null) {
ft.remove(prev);
}
ft.addToBackStack(null);
DialogFragment newFragment = MyDialogFragment.newInstance(mStackLevel);
newFragment.show(ft, "dialog");
}
二、警告对话框,类似AlertDialog
public static class MyAlertDialogFragment extends DialogFragment {
public static MyAlertDialogFragment newInstance(int title) {
MyAlertDialogFragment frag = new MyAlertDialogFragment();
Bundle args = new Bundle();
args.putInt("title", title);
frag.setArguments(args);
return frag;
}
这里Android开发网提示大家,下面重写了onCreateDialog方法,而不是onCreateView,希望大家注意:
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
int title = getArguments().getInt("title");
return new AlertDialog.Builder(getActivity())
.setIcon(R.drawable.alert_dialog_icon)
.setTitle(title)
.setPositiveButton(R.string.alert_dialog_ok,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
((FragmentAlertDialog)getActivity()).doPositiveClick();
}
}
)
.setNegativeButton(R.string.alert_dialog_cancel,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
((FragmentAlertDialog)getActivity()).doNegativeClick();
}
}
)
.create();
}
}
显示Alert的Fragment类似AlertDialog,下面是Activity中使用的showDialog的实现代码,如下
void showDialog() {
DialogFragment newFragment = MyAlertDialogFragment.newInstance(
R.string.alert_dialog_two_buttons_title);
newFragment.show(getFragmentManager(), "dialog");
}
public void doPositiveClick() {
// Do stuff here.
Log.i("FragmentAlertDialog", "Positive click!");
}
public void doNegativeClick() {
// Do stuff here.
Log.i("FragmentAlertDialog", "Negative click!");
}
如果你不了解Fragment,可以查看Android Fragment使用详解一文
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