是否可以在viewpager android中只创建一个可滑动的视图

Posted 2023-02-26

【中文标题】是否可以在viewpager android中只创建一个可滑动的视图

【英文标题】：Is it possible to create only one view swipeable in viewpager android

【发布时间】：2021-05-01 07:29:36

【问题描述】：

我在我的应用程序中使用 viewpager，我只想让一个视图可滑动。有没有可能这样做。 当我滑动时，我不希望底部的按钮移动我只想改变文本视图。

任何人都可以帮助我搜索了很多但找不到任何东西。

这是我的代码。 有很多代码我不能在这里全部粘贴。 Here is the link to the rest of it.

ViewPagerAdapter.java

public class ViewPagerAdapter extends PagerAdapter 

private Activity activity;
private Cursor cursor;
private int i = 0;
private int f = 0;

OnItemClickListener mOnItemClickListener;

public ViewPagerAdapter(Activity activity, Cursor cursor) 
    this.activity = activity;
    this.cursor = cursor;


public void setOnItemClickListener(OnItemClickListener onItemClickListener) 
    mOnItemClickListener = onItemClickListener;


@Override
public int getCount() 
    return cursor.getCount();


@Override
public boolean isViewFromObject(@NonNull View view, @NonNull Object object) 
    return view == object;


@NonNull
@Override
public Object instantiateItem(@NonNull final ViewGroup container, final int position) 
    final Context context = container.getContext();
    LayoutInflater inflater = LayoutInflater.from(context);

    View v = inflater.inflate(R.layout.quote_detail_viewpager, container, false);

    final TextView tvQuotes;
    final ImageButton favouriteBtn, shareBtn, copyBtn, bgBtn, fontBtn;

    tvQuotes = v.findViewById(R.id.vp_quotes);
    favouriteBtn = v.findViewById(R.id.vp_fav);
    shareBtn = v.findViewById(R.id.vp_share);
    copyBtn = v.findViewById(R.id.vp_copy);
    bgBtn = v.findViewById(R.id.vp_bg);
    fontBtn = v.findViewById(R.id.vp_font);

    int[] fonts = 
            R.font.architects_daughter, R.font.artifika, R.font.carter_one,
            R.font.expletus_sans, R.font.fredoka_one, R.font.graduate, R.font.jose,
            R.font.magnolia, R.font.oswald, R.font.quicksand_bold, R.font.righteous,
            R.font.salsa, R.font.schoolbell, R.font.sofadi_one
    ;
    cursor.moveToPosition(position);
    String id = cursor.getString(0);
    String quote = cursor.getString(1);
    String author = cursor.getString(2);
    String text = quote + "\n \n -  "+ author;

    if (new DatabaseHelper(context).isFavourite(id)) 
        favouriteBtn.setImageResource(R.drawable.ic_favorite);
    


    tvQuotes.setText(text);
    tvQuotes.setTypeface(PrefUtils.getTypefaceFromPrefs(context));

    favouriteBtn.setOnClickListener(view ->
            UtilsHelper.addOrDeleteFavourite(context, favouriteBtn, id, quote, author));

    shareBtn.setOnClickListener(view -> UtilsHelper.shareTextIntent(context, text));

    copyBtn.setOnClickListener(view -> UtilsHelper.copyText(context, text));

    bgBtn.setOnClickListener(view -> mOnItemClickListener.onItemClick(view));

    fontBtn.setOnClickListener(view -> 
        int j = f++;
        if (j < fonts.length) 

            PrefUtils.setTypefaceFromPrefs(context, fonts[j]);
            tvQuotes.setTypeface(PrefUtils.getTypefaceFromPrefs(context));
            notifyDataSetChanged();
        
        if (f == fonts.length) 
            f = 0;
        
    );

    container.addView(v);
    return v;


@Override
public int getItemPosition(@NonNull Object object) 
    return POSITION_NONE;


@Override
public void destroyItem(ViewGroup container, int position, @NonNull Object object) 
    container.removeView((View) object);


public interface OnItemClickListener 
    void onItemClick(View view);

DetailActivity.java

public class QuoteDetailActivity extends AppCompatActivity 

// Max swipe ad interval
private final int MAX_AD_COUNT = 10;
// count swipes
private int SWIPE_COUNT = 0;
// Min swipe ad interval
private int MIN_AD_COUNT = 6;
private int i = 0;
private InterstitialAd mInterstitialAd;
ViewPagerAdapter pagerAdapter;

RelativeLayout rootLayout;
int[] backgrounds;

@Override
protected void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);

    getWindow().setFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS,
            WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);

    Objects.requireNonNull(getSupportActionBar()).hide(); //hide the title bar
    setContentView(R.layout.activity_quote_detail);

    showInterstitialAd();

    // String extras
    String incomingActivity = getIntent().getStringExtra(Constants.STRING_EXTRA_INCOMING_ACTIVITY);
    int position = getIntent().getIntExtra(Constants.STRING_EXTRA_ADAPTER_POSITION, 0);

    DatabaseHelper mDBHelper = new DatabaseHelper(this);

    ViewPager viewPager = findViewById(R.id.single_quote_viewpager);

    backgrounds = BackgroundUtils.getAllBackgrounds();
    rootLayout = findViewById(R.id.root_container);
    rootLayout.setBackgroundResource(BackgroundUtils.getBackground(position));

    FrameLayout adContainerView = findViewById(R.id.ad_view_container);
    adContainerView.post(() ->
            AdHelper.loadBanner(this, adContainerView, viewPager));


    assert incomingActivity != null;
    if (incomingActivity.contains(Constants.ACTIVITY_QUOTES)) 
        pagerAdapter = new ViewPagerAdapter(this, mDBHelper.getAllQuotes());

     else if (incomingActivity.contains(Constants.ACTIVITY_FAVOURITE)) 
        pagerAdapter = new ViewPagerAdapter(this, mDBHelper.getFavourites());
    

    viewPager.setAdapter(pagerAdapter);
    viewPager.setCurrentItem(position); // Setup recycleView Item position

    pagerAdapter.setOnItemClickListener(new ViewPagerAdapter.OnItemClickListener() 
        @Override
        public void onItemClick(View view) 
            changeBackground();

        
    );

    viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() 
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) 

        

        @Override
        public void onPageSelected(int position) 

            int count = SWIPE_COUNT++;
            if (count >= MIN_AD_COUNT) 
                if (mInterstitialAd != null) 
                    mInterstitialAd.show(QuoteDetailActivity.this);
                    SWIPE_COUNT = 0;
                

            
        

        @Override
        public void onPageScrollStateChanged(int state) 

        
    );


private void changeBackground() 

    int j = i++;
    if (j < backgrounds.length) 
        rootLayout.setBackgroundResource(backgrounds[j]);
    
    if (i == backgrounds.length) 
        i = 0;
    


private void showInterstitialAd() 

    MobileAds.initialize(this, initializationStatus -> 
    );
    AdRequest adRequest = new AdRequest.Builder().build();

    InterstitialAd.load(this, getString(R.string.interstitial_ad_unit),
            adRequest, new InterstitialAdLoadCallback() 
                @Override
                public void onAdLoaded(@NonNull InterstitialAd interstitialAd) 
                    // The mInterstitialAd reference will be null until
                    // an ad is loaded.
                    mInterstitialAd = interstitialAd;

                    mInterstitialAd.setFullScreenContentCallback(new FullScreenContentCallback() 
                        @Override
                        public void onAdDismissedFullScreenContent() 
                            // Called when fullscreen content is dismissed.
                            if (MIN_AD_COUNT < MAX_AD_COUNT) 
               
                                MIN_AD_COUNT++;
                            
                        

                        @Override
                        public void onAdShowedFullScreenContent() 
                            // Called when fullscreen content is shown.
                            // Make sure to set your reference to null so you don't
                            // show it a second time.
                            mInterstitialAd = null;
                        
                    );
                

                @Override
                public void onAdFailedToLoad(@NonNull LoadAdError loadAdError) 
                    // Handle the error
                    mInterstitialAd = null;
                
            );

    

【参考方案1】：

当然，类似于下面的 pseudo_xml

<Parent View> -- background set to image

    <ViewPager> --  only this part is swipable

    <View Containing Buttons Fixed To The Bottom Of Parent/>

</Parent View>

【讨论】：

但问题是我想用其中一个按钮更改我的 textview 的字体，我可以从父活动中做到这一点

你可以。这将需要一个新问题