Demonstration of hiding and showing fragments.
/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.android.apis.app;
import com.example.android.apis.R;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
/**
* Demonstration of hiding and showing fragments.
*/
public class FragmentHideShow extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_hide_show);
// The content view embeds two fragments; now retrieve them and attach
// their "hide" button.
FragmentManager fm = getFragmentManager();
addShowHideListener(R.id.frag1hide, fm.findFragmentById(R.id.fragment1));
addShowHideListener(R.id.frag2hide, fm.findFragmentById(R.id.fragment2));
}
void addShowHideListener(int buttonId, final Fragment fragment) {
final Button button = (Button)findViewById(buttonId);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.setCustomAnimations(android.R.animator.fade_in,
android.R.animator.fade_out);
if (fragment.isHidden()) {
ft.show(fragment);
button.setText("Hide");
} else {
ft.hide(fragment);
button.setText("Show");
}
ft.commit();
}
});
}
public static class FirstFragment extends Fragment {
TextView mTextView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.labeled_text_edit, container, false);
View tv = v.findViewById(R.id.msg);
((TextView)tv).setText("The fragment saves and restores this text.");
// Retrieve the text editor, and restore the last saved state if needed.
mTextView = (TextView)v.findViewById(R.id.saved);
if (savedInstanceState != null) {
mTextView.setText(savedInstanceState.getCharSequence("text"));
}
return v;
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
// Remember the current text, to restore if we later restart.
outState.putCharSequence("text", mTextView.getText());
}
}
public static class SecondFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.labeled_text_edit, container, false);
View tv = v.findViewById(R.id.msg);
((TextView)tv).setText("The TextView saves and restores this text.");
// Retrieve the text editor and tell it to save and restore its state.
// Note that you will often set this in the layout XML, but since
// we are sharing our layout with the other fragment we will customize
// it here.
((TextView)v.findViewById(R.id.saved)).setSaveEnabled(true);
return v;
}
}
}
//fragment_hide_show.xml
<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2010 The Android Open Source Project
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<!-- Top-level content view for the layout fragment sample. -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:gravity="center_horizontal"
android:layout_width="match_parent" android:layout_height="match_parent">
<TextView android:layout_width="match_parent" android:layout_height="wrap_content"
android:gravity="center_vertical|center_horizontal"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Demonstration of hiding and showing fragments." />
<LinearLayout android:orientation="horizontal" android:padding="4dip"
android:gravity="center_vertical" android:layout_weight="1"
android:layout_width="match_parent" android:layout_height="wrap_content">
<Button android:id="@+id/frag1hide"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:text="Hide" />
<fragment android:name="com.example.android.apis.app.FragmentHideShow$FirstFragment"
android:id="@+id/fragment1" android:layout_weight="1"
android:layout_width="0px" android:layout_height="wrap_content" />
</LinearLayout>
<LinearLayout android:orientation="horizontal" android:padding="4dip"
android:gravity="center_vertical" android:layout_weight="1"
android:layout_width="match_parent" android:layout_height="wrap_content">
<Button android:id="@+id/frag2hide"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:text="Hide" />
<fragment android:name="com.example.android.apis.app.FragmentHideShow$SecondFragment"
android:id="@+id/fragment2" android:layout_weight="1"
android:layout_width="0px" android:layout_height="wrap_content" />
</LinearLayout>
</LinearLayout>
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