The file containing the source code shown below is located in the corresponding directory in <sdk>/samples/android-<version>/...
/*
* Copyright (C) 2011 The Android开源工程
*
* 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.view;
import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.Activity;
import android.app.FragmentTransaction;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.Button;
import android.widget.ScrollView;
import android.widget.SearchView;
import android.widget.SeekBar;
import android.widget.ShareActionProvider;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.SearchView.OnQueryTextListener;
import com.example.android.apis.R;
/**
* This activity demonstrates how to use system UI flags to implement
* a content browser style of UI (such as a book reader).
*/
public class ContentBrowserActivity extends Activity
implements OnQueryTextListener, ActionBar.TabListener {
/**
* Implementation of a view for displaying immersive content, using system UI
* flags to transition in and out of modes where the user is focused on that
* content.
*/
public static class Content extends ScrollView
implements View.OnSystemUiVisibilityChangeListener, View.OnClickListener {
TextView mText;
TextView mTitleView;
SeekBar mSeekView;
boolean mNavVisible;
int mBaseSystemUiVisibility = SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
| SYSTEM_UI_FLAG_LAYOUT_STABLE;
int mLastSystemUiVis;
Runnable mNavHider = new Runnable() {
@Override public void run() {
setNavVisibility(false);
}
};
public Content(Context context, AttributeSet attrs) {
super(context, attrs);
mText = new TextView(context);
mText.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 16);
mText.setText(context.getString(R.string.alert_dialog_two_buttons2ultra_msg));
mText.setClickable(false);
mText.setOnClickListener(this);
mText.setTextIsSelectable(true);
addView(mText, new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
setOnSystemUiVisibilityChangeListener(this);
}
public void init(TextView title, SeekBar seek) {
// This called by the containing activity to supply the surrounding
// state of the content browser that it will interact with.
mTitleView = title;
mSeekView = seek;
setNavVisibility(true);
}
@Override public void onSystemUiVisibilityChange(int visibility) {
// Detect when we go out of low-profile mode, to also go out
// of full screen. We only do this when the low profile mode
// is changing from its last state, and turning off.
int diff = mLastSystemUiVis ^ visibility;
mLastSystemUiVis = visibility;
if ((diff&SYSTEM_UI_FLAG_LOW_PROFILE) != 0
&& (visibility&SYSTEM_UI_FLAG_LOW_PROFILE) == 0) {
setNavVisibility(true);
}
}
@Override protected void onWindowVisibilityChanged(int visibility) {
super.onWindowVisibilityChanged(visibility);
// When we become visible, we show our navigation elements briefly
// before hiding them.
setNavVisibility(true);
getHandler().postDelayed(mNavHider, 2000);
}
@Override protected void onScrollChanged(int l, int t, int oldl, int oldt) {
super.onScrollChanged(l, t, oldl, oldt);
// When the user scrolls, we hide navigation elements.
setNavVisibility(false);
}
@Override public void onClick(View v) {
// When the user clicks, we toggle the visibility of navigation elements.
int curVis = getSystemUiVisibility();
setNavVisibility((curVis&SYSTEM_UI_FLAG_LOW_PROFILE) != 0);
}
void setBaseSystemUiVisibility(int visibility) {
mBaseSystemUiVisibility = visibility;
}
void setNavVisibility(boolean visible) {
int newVis = mBaseSystemUiVisibility;
if (!visible) {
newVis |= SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_FULLSCREEN;
}
final boolean changed = newVis == getSystemUiVisibility();
// Unschedule any pending event to hide navigation if we are
// changing the visibility, or making the UI visible.
if (changed || visible) {
Handler h = getHandler();
if (h != null) {
h.removeCallbacks(mNavHider);
}
}
// Set the new desired visibility.
setSystemUiVisibility(newVis);
mTitleView.setVisibility(visible ? VISIBLE : INVISIBLE);
mSeekView.setVisibility(visible ? VISIBLE : INVISIBLE);
}
}
Content mContent;
public ContentBrowserActivity() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().requestFeature(Window.FEATURE_ACTION_BAR_OVERLAY);
setContentView(R.layout.content_browser);
mContent = (Content)findViewById(R.id.content);
mContent.init((TextView)findViewById(R.id.title),
(SeekBar)findViewById(R.id.seekbar));
ActionBar bar = getActionBar();
bar.addTab(bar.newTab().setText("Tab 1").setTabListener(this));
bar.addTab(bar.newTab().setText("Tab 2").setTabListener(this));
bar.addTab(bar.newTab().setText("Tab 3").setTabListener(this));
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.content_actions, menu);
SearchView searchView = (SearchView) menu.findItem(R.id.action_search).getActionView();
searchView.setOnQueryTextListener(this);
// Set file with share history to the provider and set the share intent.
MenuItem actionItem = menu.findItem(R.id.menu_item_share_action_provider_action_bar);
ShareActionProvider actionProvider = (ShareActionProvider) actionItem.getActionProvider();
actionProvider.setShareHistoryFileName(ShareActionProvider.DEFAULT_SHARE_HISTORY_FILE_NAME);
// Note that you can set/change the intent any time,
// say when the user has selected an image.
Intent shareIntent = new Intent(Intent.ACTION_SEND);
shareIntent.setType("image/*");
Uri uri = Uri.fromFile(getFileStreamPath("shared.png"));
shareIntent.putExtra(Intent.EXTRA_STREAM, uri);
actionProvider.setShareIntent(shareIntent);
return true;
}
@Override
public void onAttachedToWindow() {
super.onAttachedToWindow();
}
@Override
protected void onResume() {
super.onResume();
}
/**
* This method is declared in the menu.
*/
public void onSort(MenuItem item) {
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.show_tabs:
getActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
item.setChecked(true);
return true;
case R.id.hide_tabs:
getActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
item.setChecked(true);
return true;
case R.id.stable_layout:
item.setChecked(!item.isChecked());
mContent.setBaseSystemUiVisibility(item.isChecked()
? View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
| View.SYSTEM_UI_FLAG_LAYOUT_STABLE
: View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
return true;
}
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
return true;
}
@Override
public boolean onQueryTextSubmit(String query) {
Toast.makeText(this, "Searching for: " + query + "...", Toast.LENGTH_SHORT).show();
return true;
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
}
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
}
@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
}
}