Viewpager使用tabLayout和PagerTabStrip

Question

我在viewPager中进行了一些实验 一个viewpager与不同的FragmentAdapter 目前代码工作正常，但我不知道它是否是正确的方法。

我的活动就是这个。

public class Navigation extends AppCompatActivity
    implements NavigationView.OnNavigationItemSelectedListener, TabHost.OnTabChangeListener, ViewPager.OnPageChangeListener, View.OnClickListener {
private DrawerLayout drawer;
private ViewPager pager;
public static TabHost tabHost;
public static TabWidget tabWidget;
public static FloatingActionMenu fab;
private boolean doubleBackToExitPressedOnce = false;
private String currentTab;
private Button mButton;
private LinearLayout mLinearLayout;
private PagerSlidingTabStrip mTabLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getWindow().getAttributes().windowAnimations = 0;
    setContentView(R.layout.activity_navigation);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
            this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
    drawer.setDrawerListener(toggle);
    toggle.syncState();

    fab = (FloatingActionMenu) findViewById(R.id.fabMenu);
    fab.setVisibility(View.GONE);


    NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
    navigationView.setNavigationItemSelectedListener(this);

    tabHost = (TabHost) findViewById(R.id.tabHost);
    tabHost.setup();
    tabHost.setOnTabChangedListener(this);
    tabWidget = (TabWidget) findViewById(android.R.id.tabs);
    setNewTab(tabHost, "tab1", R.string.textTabTitle1, R.drawable.icon_search, R.id.tab1);
    setNewTab(tabHost, "tab2", R.string.textTabTitle1, R.drawable.icon_comment, R.id.tab2);
    setNewTab(tabHost, "tab3", R.string.textTabTitle1, R.drawable.icon_car, R.id.tab3);

    mTabLayout = (PagerSlidingTabStrip) findViewById(R.id.tab);
    pager = (ViewPager) findViewById(R.id.pager);
    pager.setAdapter(new FragmentAdapterSearch(getSupportFragmentManager()));
    mTabLayout.setViewPager(pager);
    pager.addOnPageChangeListener(this);

    mButton = (Button) findViewById(R.id.btnSearch);
    mLinearLayout = (LinearLayout) findViewById(R.id.btnSelectLocation);
    mButton.setOnClickListener(this);
    mLinearLayout.setOnClickListener(this);
    TabIcon.setColor(0, mTabLayout, iconSearchOpac, iconSearch);
}


private void setNewTab(TabHost tabHost, String tag, int title, int icon, int contentID) {
    TabHost.TabSpec tabSpec = tabHost.newTabSpec(tag);
    tabSpec.setIndicator(getTabIndicator(tabHost.getContext(), title, icon));
    tabSpec.setContent(contentID);
    tabHost.addTab(tabSpec);
}

private View getTabIndicator(Context context, int title, int icon) {
    View view = LayoutInflater.from(context).inflate(R.layout.tab_layout, null);
    final ImageView iv = (ImageView) view.findViewById(R.id.imageView);
    iv.setImageResource(icon);
    TextView tv = (TextView) view.findViewById(R.id.textView);
    tv.setText(title);
    return view;
}

@Override
public void onBackPressed() {
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    if (drawer.isDrawerOpen(GravityCompat.START)) {
        drawer.closeDrawer(GravityCompat.START);
    } else if (!drawer.isDrawerOpen(GravityCompat.START)) {
        if (doubleBackToExitPressedOnce) {
            super.onBackPressed();
            return;
        }
        this.doubleBackToExitPressedOnce = true;
        Toast.makeText(this, "Tap Again to Exit Toweelo", Toast.LENGTH_SHORT).show();
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                doubleBackToExitPressedOnce = false;
            }
        }, 2000);
    } else {
        super.onBackPressed();
    }
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.navigation, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    if (item.getItemId() == android.R.id.home) {
        if (drawer.isDrawerOpen(Gravity.LEFT)) {
            drawer.closeDrawer(Gravity.LEFT);
        } else {
            drawer.openDrawer(Gravity.LEFT);
        }
        return true;
    }

    return super.onOptionsItemSelected(item);
}

@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
    int id = item.getItemId();
    if (id == R.id.nav_camera) {

    } else if (id == R.id.nav_gallery) {

    } else if (id == R.id.nav_slideshow) {

    }
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    drawer.closeDrawer(GravityCompat.START);
    return true;
}

@Override
public void onTabChanged(String tabId) {
    currentTab = tabId;
    if (currentTab.equalsIgnoreCase("tab1")) {
        if (pager != null) {
            pager.setAdapter(new FragmentAdapterSearch(getSupportFragmentManager()));
            mButton.setVisibility(View.VISIBLE);
            TabIcon.setColor(0, mTabLayout, iconSearchOpac, iconSearch);
        }
    }
    if (currentTab.equalsIgnoreCase("tab2")) {
        if (pager != null) {
            pager.setAdapter(new FragmentAdapterComments(getSupportFragmentManager()));
            mButton.setVisibility(View.INVISIBLE);
            TabIcon.setColor(0, mTabLayout, iconCommentOpac, iconComment);
        }
    }
    if (currentTab.equalsIgnoreCase("tab3")) {
        if (pager != null) {
            pager.setAdapter(new FragmentAdapterCars(getSupportFragmentManager()));
            mButton.setVisibility(View.VISIBLE);
            TabIcon.setColor(0, mTabLayout, iconCarOpac, iconCar);
        }
    }
}

@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}

@Override
public void onPageSelected(int position) {
    if (currentTab.equalsIgnoreCase("tab1")) {
        TabIcon.setColor(position, mTabLayout, iconSearchOpac, iconSearch);
    }
    if (currentTab.equalsIgnoreCase("tab2")) {
        TabIcon.setColor(position, mTabLayout, iconCommentOpac, iconComment);
    }
    if (currentTab.equalsIgnoreCase("tab3")) {
        TabIcon.setColor(position, mTabLayout, iconCarOpac, iconCar);
    }
}

@Override
public void onPageScrollStateChanged(int state) {
}

@Override
public void onClick(View v) {
    switch (v.getId()) {
        case R.id.btnSearch:
            startActivity(new Intent(Navigation.this, SelectCategory.class));
            break;
        case R.id.btnSelectLocation:
            startActivity(new Intent(Navigation.this, SelectLocation.class));

     }
  }
 }

而我的XML就是这样。

<?xml version="1.0" encoding="utf-8"?>
 <android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:fab="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/colorWhite"
android:fitsSystemWindows="true"
tools:context="com.toweelo.Navigation">

<android.support.design.widget.AppBarLayout
    android:id="@+id/appBar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:fitsSystemWindows="true"
    android:theme="@style/AppTheme.AppBarOverlay"
    app:elevation="0dp">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:layout_scrollFlags="scroll|enterAlways"
        >

        <LinearLayout android:layout_width="match_parent"
                      android:layout_height="match_parent"
                      android:gravity="center_vertical"
                      android:weightSum="10">
            <LinearLayout android:id="@+id/btnSelectLocation"
                          android:layout_width="0dp"
                          android:layout_height="match_parent"
                          android:layout_weight="5.5"
                          android:background="@drawable/ripple_effect"
                          android:clickable="true"
                          android:gravity="center_horizontal"
                          android:orientation="horizontal"
                          android:paddingLeft="8dp">
                <com.toweelo.custom.CustomTextView
                    android:layout_width="wrap_content"
                    android:layout_height="match_parent"
                    android:gravity="center_vertical"
                    android:text="Quezon City"
                    android:textColor="@color/colorWhite"
                    android:textSize="@dimen/title"/>

                <ImageView
                    android:layout_width="24dp"
                    android:layout_height="match_parent"
                    android:src="@drawable/ic_down_arrow"/>
            </LinearLayout>

            <RelativeLayout android:layout_width="0dp"
                            android:layout_height="36dp"
                            android:layout_marginLeft="10dp"
                            android:layout_weight="4.5">
                <Button android:id="@+id/btnSearch"
                        android:layout_width="match_parent"
                        android:layout_height="match_parent"
                        android:background="@drawable/custom_search_button"
                        android:drawableRight="@drawable/ic_search"
                        android:text="Search"
                        android:textColor="@color/colorWhite"
                        android:textSize="14dp"/>
            </RelativeLayout>
        </LinearLayout>

    </android.support.v7.widget.Toolbar>
    <com.astuetz.PagerSlidingTabStrip
        android:id="@+id/tab"
        android:layout_width="match_parent"
        android:layout_height="48dp"
        android:background="@color/colorPrimary"
        app:pstsDividerColor="@color/colorPrimary"
        app:pstsIndicatorColor="@color/colorWhite"
        app:pstsIndicatorHeight="3dp"
        app:pstsShouldExpand="true"
        app:pstsTextAllCaps="false"/>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
    android:id="@+id/pager"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    />
<com.github.clans.fab.FloatingActionMenu
    android:id="@+id/fabMenu"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_alignParentBottom="true"
    android:layout_alignParentRight="true"
    fab:menu_animationDelayPerItem="50"
    fab:menu_backgroundColor="#B3FFFFFF"
    fab:menu_buttonSpacing="0dp"
    fab:menu_colorNormal="#DA4336"
    fab:menu_colorPressed="#E75043"
    fab:menu_colorRipple="#99FFFFFF"
    fab:menu_fab_size="normal"
    fab:menu_icon="@drawable/fab_add"
    fab:menu_labels_colorNormal="@color/colorWhite"
    fab:menu_labels_cornerRadius="3dp"
    fab:menu_labels_ellipsize="none"
    fab:menu_labels_margin="0dp"
    fab:menu_labels_maxLines="-1"
    fab:menu_labels_padding="8dp"
    fab:menu_labels_paddingBottom="4dp"
    fab:menu_labels_paddingLeft="8dp"
    fab:menu_labels_paddingRight="8dp"
    fab:menu_labels_paddingTop="4dp"
    fab:menu_labels_position="left"
    fab:menu_labels_showShadow="true"
    fab:menu_labels_singleLine="false"
    fab:menu_labels_textColor="@color/colorBlack"
    fab:menu_labels_textSize="14sp"
    fab:menu_openDirection="up"
    fab:menu_shadowColor="#66000000"
    fab:menu_shadowRadius="4dp"
    fab:menu_shadowXOffset="1dp"
    fab:menu_shadowYOffset="3dp"
    fab:menu_showShadow="true"
    >
    <com.github.clans.fab.FloatingActionButton
        android:id="@+id/menuIn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_premium"
        fab:fab_colorNormal="@color/colorPremium"
        fab:fab_colorPressed="@color/colorPremiumDark"
        fab:fab_colorRipple="@color/colorPremiumAccent"
        fab:fab_label="Premium"
        fab:fab_size="mini"

        />
    <com.github.clans.fab.FloatingActionButton
        android:id="@+id/menuOut"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_saves"
        fab:fab_colorNormal="@color/colorSaves"
        fab:fab_colorPressed="@color/colorSavesDark"
        fab:fab_colorRipple="@color/colorSavesAccent"
        fab:fab_label="Saves"
        fab:fab_size="mini"/>

    <com.github.clans.fab.FloatingActionButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_edit"
        fab:fab_colorNormal="@color/colorPrimary"
        fab:fab_colorPressed="@color/colorPrimaryDark"
        fab:fab_colorRipple="@color/colorAccent"
        fab:fab_label="Write"
        fab:fab_size="mini"/>
</com.github.clans.fab.FloatingActionMenu>

<TabHost android:id="@+id/tabHost"
         xmlns:android="http://schemas.android.com/apk/res/android"
         android:layout_width="match_parent"
         android:layout_height="match_parent">

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical">

        <FrameLayout
            android:id="@android:id/tabcontent"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1">

            <LinearLayout
                android:id="@+id/tab1"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="@color/colorWhite"
                android:orientation="vertical">

            </LinearLayout>

            <LinearLayout
                android:id="@+id/tab2"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="@color/colorWhite"
                android:orientation="vertical">

            </LinearLayout>

            <LinearLayout
                android:id="@+id/tab3"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="@color/colorWhite"
                android:orientation="vertical">

            </LinearLayout>

        </FrameLayout>

        <TabWidget
            android:id="@android:id/tabs"
            android:layout_width="fill_parent"
            android:layout_height="52dp"
            android:layout_weight="0"
            android:showDividers="none"/>
    </LinearLayout>
</TabHost>

       </android.support.design.widget.CoordinatorLayout>  

所以我想知道我的代码在将来的使用中是否会出现错误？
我的意思是，它是否会出现内存不足问题，因为我只使用一个viewpager用于不同的适配器。

对于带有pagerTabStrip的标签我是否正确地执行它？ 感谢。

Answer 1

因此，您要在每个FragmentPagerAdapter上设置新的TabHost，从而在用户单击另一个选项卡时在运行时创建3个新片段。这可能会给用户造成混淆，如果这些内容加载了大量资源，更大的内存消耗和进一步的用户烦恼。