? 回到主窗口
1. 将主窗口的创建模式设为singleTask。
2. 直接显示主窗口
1 public class MainActivity extends Activity {
2
3 @Override
4 protected void onCreate(Bundle savedInstanceState) {
5 super.onCreate(savedInstanceState);
6 setContentView(R.layout.activity_main);
7 setTitle("主窗口:" + String.valueOf(hashCode()));
8 }
9
10 public void onClick_NewActivity(View view) {
11 Intent intent = new Intent(this, NewActivity.class);
12 startActivity(intent);
13 }
14
15 }
1 public class NewActivity extends Activity {
2
3 @Override
4 protected void onCreate(Bundle savedInstanceState) {
5 super.onCreate(savedInstanceState);
6 setContentView(R.layout.activity_new);
7 setTitle("新窗口:" + String.valueOf(hashCode()));
8 }
9
10 public void onClick_NewActivity(View view) {
11 Intent intent = new Intent(this, NewActivity.class);
12 startActivity(intent);
13 }
14
15 public void onClick_GoMainActivity(View view) {
16 Intent intent = new Intent(this, MainActivity.class);
17 startActivity(intent);
18 }
19 }
1 <?xml version="1.0" encoding="utf-8"?> 2 <manifest xmlns:android="http://schemas.android.com/apk/res/android" 3 package="cn" 4 android:versionCode="1" 5 android:versionName="1.0" > 6 7 <uses-sdk 8 android:minSdkVersion="17" 9 android:targetSdkVersion="17" /> 10 11 <application 12 android:allowBackup="true" 13 android:icon="@drawable/ic_launcher" 14 android:label="@string/app_name" 15 android:theme="@style/AppTheme" > 16 <activity 17 android:name="cn.MainActivity" 18 android:label="@string/app_name" 19 android:launchMode="singleTask" > 20 <intent-filter> 21 <action android:name="android.intent.action.MAIN" /> 22 <category android:name="android.intent.category.LAUNCHER" /> 23 </intent-filter> 24 </activity> 25 26 <activity android:name="cn.NewActivity" /> 27 </application> 28 29 </manifest>
? 滑动导航
涉及到的主要Java类。
ViewPager FragmentPagerAdapter
1 import java.util.Locale;
2
3 import android.os.Bundle;
4 import android.support.v4.app.Fragment;
5 import android.support.v4.app.FragmentActivity;
6 import android.support.v4.app.FragmentManager;
7 import android.support.v4.app.FragmentPagerAdapter;
8 import android.support.v4.view.ViewPager;
9 import android.view.LayoutInflater;
10 import android.view.Menu;
11 import android.view.View;
12 import android.view.ViewGroup;
13 import android.widget.TextView;
14
15 public class MainActivity extends FragmentActivity {
16
17 /**
18 * The {@link android.support.v4.view.PagerAdapter} that will provide
19 * fragments for each of the sections. We use a
20 * {@link android.support.v4.app.FragmentPagerAdapter} derivative, which
21 * will keep every loaded fragment in memory. If this becomes too memory
22 * intensive, it may be best to switch to a
23 * {@link android.support.v4.app.FragmentStatePagerAdapter}.
24 */
25 SectionsPagerAdapter mSectionsPagerAdapter;
26
27 /**
28 * The {@link ViewPager} that will host the section contents.
29 */
30 ViewPager mViewPager;
31
32 @Override
33 protected void onCreate(Bundle savedInstanceState) {
34 super.onCreate(savedInstanceState);
35 setContentView(R.layout.activity_main);
36 // Create the adapter that will return a fragment for each of the three
37 // primary sections of the app.
38 mSectionsPagerAdapter = new SectionsPagerAdapter(
39 getSupportFragmentManager());
40
41
42 // Set up the ViewPager with the sections adapter.
43 mViewPager = (ViewPager) findViewById(R.id.pager);
44 mViewPager.setAdapter(mSectionsPagerAdapter);
45
46 }
47
48 @Override
49 public boolean onCreateOptionsMenu(Menu menu) {
50 // Inflate the menu; this adds items to the action bar if it is present.
51 getMenuInflater().inflate(R.menu.main, menu);
52 return true;
53 }
54
55 /**
56 * A {@link FragmentPagerAdapter} that returns a fragment corresponding to
57 * one of the sections/tabs/pages.
58 */
59 public class SectionsPagerAdapter extends FragmentPagerAdapter {
60
61 public SectionsPagerAdapter(FragmentManager fm) {
62 super(fm);
63 }
64
65 @Override
66 public Fragment getItem(int position) {
67 // getItem is called to instantiate the fragment for the given page.
68 // Return a DummySectionFragment (defined as a static inner class
69 // below) with the page number as its lone argument.
70 Fragment fragment = new DummySectionFragment();
71 Bundle args = new Bundle();
72 args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
73 fragment.setArguments(args);
74 return fragment;
75 }
76
77 @Override
78 public int getCount() {
79 // Show 3 total pages.
80 return 3;
81 }
82
83 @Override
84 public CharSequence getPageTitle(int position) {
85 Locale l = Locale.getDefault();
86 switch (position) {
87 case 0:
88 return getString(R.string.title_section1).toUpperCase(l);
89 case 1:
90 return getString(R.string.title_section2).toUpperCase(l);
91 case 2:
92 return getString(R.string.title_section3).toUpperCase(l);
93 }
94 return null;
95 }
96 }
97
98 /**
99 * A dummy fragment representing a section of the app, but that simply
100 * displays dummy text.
101 */
102 public static class DummySectionFragment extends Fragment {
103 /**
104 * The fragment argument representing the section number for this
105 * fragment.
106 */
107 public static final String ARG_SECTION_NUMBER = "section_number";
108
109 public DummySectionFragment() {
110 }
111
112 @Override
113 public View onCreateView(LayoutInflater inflater, ViewGroup container,
114 Bundle savedInstanceState) {
115 View rootView = inflater.inflate(R.layout.fragment_main_dummy,
116 container, false);
117
118 TextView dummyTextView = (TextView) rootView
119 .findViewById(R.id.section_label);
120 dummyTextView.setText(Integer.toString(getArguments().getInt(
121 ARG_SECTION_NUMBER)));
122 return rootView;
123 }
124 }
125
126 }
1 <android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android" 2 xmlns:tools="http://schemas.android.com/tools" 3 android:id="@+id/pager" 4 android:layout_width="match_parent" 5 android:layout_height="match_parent" 6 tools:context=".MainActivity" > 7 8 <!-- 9 This title strip will display the currently visible page title, as well as the page 10 titles for adjacent pages. 11 12 R.layout.activity_main 13 --> 14 15 <android.support.v4.view.PagerTitleStrip 16 android:id="@+id/pager_title_strip" 17 android:layout_width="match_parent" 18 android:layout_height="wrap_content" 19 android:layout_gravity="top" 20 android:background="#33b5e5" 21 android:paddingBottom="4dp" 22 android:paddingTop="4dp" 23 android:textColor="#fff" /> 24 25 </android.support.v4.view.ViewPager>
1 <menu xmlns:android="http://schemas.android.com/apk/res/android" > 2 <!-- 3 R.menu.main 4 --> 5 <item 6 android:id="@+id/action_settings" 7 android:orderInCategory="100" 8 android:showAsAction="never" 9 android:title="@string/action_settings"/> 10 </menu>
1 <?xml version="1.0" encoding="utf-8"?> 2 <resources> 3 <string name="app_name">MultiPageNavigation</string> 4 <string name="action_settings">Settings</string> 5 <string name="title_section1">Section 1</string> 6 <string name="title_section2">Section 2</string> 7 <string name="title_section3">Section 3</string> 8 </resources>
1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 2 xmlns:tools="http://schemas.android.com/tools" 3 android:layout_width="match_parent" 4 android:layout_height="match_parent" 5 android:paddingBottom="@dimen/activity_vertical_margin" 6 android:paddingLeft="@dimen/activity_horizontal_margin" 7 android:paddingRight="@dimen/activity_horizontal_margin" 8 android:paddingTop="@dimen/activity_vertical_margin" 9 tools:context=".MainActivity$DummySectionFragment" > 10 <!-- 11 R.layout.fragment_main_dummy 12 --> 13 <TextView 14 android:id="@+id/section_label" 15 android:layout_width="wrap_content" 16 android:layout_height="wrap_content" /> 17 18 </RelativeLayout>
? Fragment导航
使用的主要技术:Fragment Backstack。
FragmentTransaction.addToBackStack
FragmentManager.popBackStack();
1 import android.app.Activity;
2 import android.app.FragmentManager;
3 import android.app.FragmentManager.OnBackStackChangedListener;
4 import android.app.FragmentTransaction;
5 import android.os.Bundle;
6 import android.view.View;
7
8 public class FragmentNavigationActivity extends Activity implements
9 OnBackStackChangedListener {
10
11 private void nextFragment(boolean backStackFlag) {
12 try {
13 FragmentManager fragmentManager = getFragmentManager();
14
15 FragmentTransaction fragmentTransaction = fragmentManager
16 .beginTransaction();
17 FragmentPage fragment = new FragmentPage();
18 fragmentTransaction.add(R.id.fragment_container, fragment);
19
20 if (backStackFlag)
21 fragmentTransaction
22 .addToBackStack(String.valueOf(getFragmentManager()
23 .getBackStackEntryCount() + 1));
24 fragmentTransaction.commit();
25 fragmentManager.addOnBackStackChangedListener(this);
26
27 } catch (Exception e) { }
28 }
29
30 @Override
31 public void onBackStackChanged() {
32 setTitle("当前第" + (getFragmentManager().getBackStackEntryCount() + 1)
33 + "页");
34 }
35
36 @Override
37 protected void onCreate(Bundle savedInstanceState) {
38 super.onCreate(savedInstanceState);
39 setContentView(R.layout.activity_fragment_navigation);
40 nextFragment(false);
41 onBackStackChanged();
42 }
43
44 public void onClick_NextPage(View view) {
45 nextFragment(true);
46 }
47
48 public void onClick_PrevPage(View view) {
49 FragmentManager fragmentManager = getFragmentManager();
50 fragmentManager.popBackStack();
51 // 将回退栈在Fragment状态全部出栈，恢复到第1页
52 // fragmentManager.popBackStackImmediate("1",FragmentManager.POP_BACK_STACK_INCLUSIVE);
53 }
54 }
1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 2 android:layout_width="match_parent" 3 android:layout_height="match_parent" 4 android:orientation="vertical" > 5 <!-- 6 R.layout.activity_fragment_navigation 7 --> 8 <LinearLayout 9 android:layout_width="match_parent" 10 android:layout_height="wrap_content" 11 android:orientation="horizontal" > 12 <Button 13 android:layout_width="match_parent" 14 android:layout_height="wrap_content" 15 android:onClick="onClick_PrevPage" 16 android:text="上一页" android:layout_weight="1" /> 17 <Button 18 android:layout_width="match_parent" 19 android:layout_height="wrap_content" 20 android:onClick="onClick_NextPage" 21 android:text="下一页" android:layout_weight="1" /> 22 </LinearLayout> 23 24 <FrameLayout 25 android:id="@+id/fragment_container" 26 android:layout_width="match_parent" 27 android:layout_height="wrap_content" /> 28 29 </LinearLayout>
1 import java.util.Random;
2 import android.app.Fragment;
3 import android.os.Bundle;
4 import android.view.LayoutInflater;
5 import android.view.View;
6 import android.view.ViewGroup;
7 import android.widget.EditText;
8
9 public class FragmentPage extends Fragment {
10
11 @Override
12 public View onCreateView(LayoutInflater inflater, ViewGroup container,
13 Bundle savedInstanceState) {
14 View view = inflater.inflate(R.layout.fragment_page, container, false);
15
16 EditText editText = (EditText) view.findViewById(R.id.edittext);
17
18 editText.setText(String.valueOf(Math.abs(new Random().nextLong())));
19 return view;
20 }
21
22 }
1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 2 android:layout_width="match_parent" 3 android:layout_height="match_parent" 4 android:orientation="vertical" android:background="#FFF"> 5 <!-- 6 R.layout.fragment_page 7 --> 8 <EditText 9 android:id="@+id/edittext" 10 android:layout_width="match_parent" 11 android:layout_height="wrap_content" 12 android:text="第一页" /> 13 14 </LinearLayout>
7、窗口导航
时间： 2024-10-29 19:03:49