如何在视图寻呼机中动态更改文本大小

Question

我已经通过将它们加载到片段中来将文本加载到ViewPager中。 在片段内部，有一个WebView。 这是用View setFragmentView编写的。

我需要动态更改字体的大小。

因此，我添加了一个搜索栏，并在触摸搜索栏时更改了大小（目前）。

但我当前加载的页面不会更改其字体大小。

ViewPager中的下一页将更新。

是他们重新加载整个片段的一种方法。

 protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    changeFont("font/Raleway-Light.ttf");

    rlFontSettings = findViewById(R.id.rl_font_settings);
    rlFontSettings.setVisibility(View.GONE);
    sbVolumeController = findViewById(R.id.sb_volume_controller);

    //Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    //setSupportActionBar(toolbar);

    pxScreenWidth = getResources().getDisplayMetrics().widthPixels;

    mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

    mViewPager = (ViewPager) findViewById(R.id.container);
    mViewPager.setOffscreenPageLimit(0);
    mViewPager.setAdapter(mSectionsPagerAdapter);

    sbVolumeController.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
        @Override
        public void onProgressChanged(SeekBar seekBar, int i, boolean b) {

        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {
            Log.d("year", "onStartTrackingTouch: inside the seek 1 ");
            changedVolumeValue = 50;
            webSettings.setDefaultFontSize(changedVolumeValue);
            mViewPager.setCurrentItem(currentPage);
        }

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {

        }
    });

    if (getIntent() != null && getIntent().getExtras() != null) {
        String filePath = getIntent().getExtras().getString("filePath");
        isPickedWebView = getIntent().getExtras().getBoolean("isWebView");

        try {
            reader = new Reader();

            //Setting optionals once per file is enough.
            reader.setMaxContentPerSection(1250);
            reader.setCssStatus(isPickedWebView ? CssStatus.INCLUDE : CssStatus.OMIT);
            reader.setIsIncludingTextContent(true);
            reader.setIsOmittingTitleTag(true);

            // This method must be called before readSection.
            reader.setFullContent(filePath);

//                int lastSavedPage = reader.setFullContentWithProgress(filePath);
            if (reader.isSavedProgressFound()) {
                int lastSavedPage = reader.loadProgress();
                mViewPager.setCurrentItem(lastSavedPage);
            }

        } catch (ReadingException e) {
            Toast.makeText(MainActivity.this, e.getMessage(), Toast.LENGTH_LONG).show();
        }
    }


}

@Override
public View onFragmentReady(int position) {

    BookSection bookSection = null;

    try {
        bookSection = reader.readSection(position);
    } catch (ReadingException e) {
        e.printStackTrace();
        Toast.makeText(MainActivity.this, e.getMessage(), Toast.LENGTH_LONG).show();
    } catch (OutOfPagesException e) {
        e.printStackTrace();
        this.pageCount = e.getPageCount();

        if (isSkippedToPage) {
            Toast.makeText(MainActivity.this, "Max page number is: " + this.pageCount, Toast.LENGTH_LONG).show();
        }

        mSectionsPagerAdapter.notifyDataSetChanged();
    }

    isSkippedToPage = false;

    if (bookSection != null) {
        return setFragmentView(isPickedWebView, bookSection.getSectionContent(), "text/html", "UTF-8"); // reader.isContentStyled

    }

    return null;
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.menu_main, menu);

    SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
    searchMenuItem = menu.findItem(R.id.action_search);
    fontSettings = menu.findItem(R.id.action_font);
    searchView = (SearchView) MenuItemCompat.getActionView(searchMenuItem);
    searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));

    fontSettings.setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
        @Override
        public boolean onMenuItemClick(MenuItem menuItem) {
            rlFontSettings.setVisibility(View.VISIBLE);
            return false;
        }
    });

    searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String query) {

            if (query != null && !query.equals("")) {

                if (TextUtils.isDigitsOnly(query)) {
                    loseFocusOnSearchView();

                    int skippingPage = Integer.valueOf(query);

                    if (skippingPage >= 0) {
                        isSkippedToPage = true;
                        mViewPager.setCurrentItem(skippingPage);
                    } else {
                        Toast.makeText(MainActivity.this, "Page number can't be less than 0", Toast.LENGTH_LONG).show();
                    }

                } else {
                    loseFocusOnSearchView();
                    Toast.makeText(MainActivity.this, "Only numbers are allowed", Toast.LENGTH_LONG).show();
                }

                return true;
            }

            return false;
        }

        @Override
        public boolean onQueryTextChange(String newText) {
            return false;
        }
    });

    return true;
}

@Override
public void onBackPressed() {
    if (!searchView.isIconified()) {
        loseFocusOnSearchView();
    } else {
        super.onBackPressed();
    }
}

@Override
protected void onStop() {
    super.onStop();
    try {
        reader.saveProgress(mViewPager.getCurrentItem());
        Toast.makeText(MainActivity.this, "Saved page: " + mViewPager.getCurrentItem() + "...", Toast.LENGTH_LONG).show();
    } catch (ReadingException e) {
        e.printStackTrace();
        Toast.makeText(MainActivity.this, "Progress is not saved: " + e.getMessage(), Toast.LENGTH_LONG).show();
    } catch (OutOfPagesException e) {
        e.printStackTrace();
        Toast.makeText(MainActivity.this, "Progress is not saved. Out of Bounds. Page Count: " + e.getPageCount(), Toast.LENGTH_LONG).show();
    }
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {

    int id = item.getItemId();

    if (id == R.id.action_search) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

private View setFragmentView(boolean isContentStyled, String data, String mimeType, String encoding) {

    FrameLayout.LayoutParams layoutParams = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
    isReContentStyled = isContentStyled;
    reData = data;
    reMimeType =mimeType;
    reEncoding = encoding;


    if (isContentStyled) {

        webView = new WebView(MainActivity.this);
        webSettings = webView.getSettings();
        Log.d("year", "setFragmentView: mytest 1 "+changedVolumeValue);
        webSettings.setDefaultFontSize(changedVolumeValue);
        webSettings.setBuiltInZoomControls(true);
        webSettings.setSupportZoom(true);
        Log.d("year", "setFragmentView: mytest 2 "+changedVolumeValue);

        webView.loadDataWithBaseURL(null, data, mimeType, encoding, null);

//            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
//                webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
//            }

        webView.setLayoutParams(layoutParams);

        return webView;
    } else {
        ScrollView scrollView = new ScrollView(MainActivity.this);
        scrollView.setLayoutParams(layoutParams);

        final TextView textView = new TextView(MainActivity.this);
        textView.setLayoutParams(layoutParams);

        textView.setTextSize(changedVolumeValue);

        textView.setText(Html.fromHtml(data, new Html.ImageGetter() {
            @Override
            public Drawable getDrawable(String source) {
                String imageAsStr = source.substring(source.indexOf(";base64,") + 8);
                byte[] imageAsBytes = Base64.decode(imageAsStr, Base64.DEFAULT);
                Bitmap imageAsBitmap = BitmapFactory.decodeByteArray(imageAsBytes, 0, imageAsBytes.length);

                int imageWidthStartPx = (pxScreenWidth - imageAsBitmap.getWidth()) / 2;
                int imageWidthEndPx = pxScreenWidth - imageWidthStartPx;

                Drawable imageAsDrawable = new BitmapDrawable(getResources(), imageAsBitmap);
                imageAsDrawable.setBounds(imageWidthStartPx, 0, imageWidthEndPx, imageAsBitmap.getHeight());
                return imageAsDrawable;
            }
        }, null));

        int pxPadding = dpToPx(12);

        textView.setPadding(pxPadding, pxPadding, pxPadding, pxPadding);

        scrollView.addView(textView);
        return scrollView;
    }
}

private void loseFocusOnSearchView() {
    searchView.setQuery("", false);
    searchView.clearFocus();
    searchView.setIconified(true);
    MenuItemCompat.collapseActionView(searchMenuItem);
}

private int dpToPx(int dp) {
    DisplayMetrics displayMetrics = getResources().getDisplayMetrics();
    return Math.round(dp * (displayMetrics.xdpi / DisplayMetrics.DENSITY_DEFAULT));
}


public class SectionsPagerAdapter extends FragmentStatePagerAdapter {

    SectionsPagerAdapter(FragmentManager fm) {
        super(fm);
    }



    @Override
    public int getCount() {
        return pageCount;
    }

    @Override
    public Fragment getItem(int position) {
        // getItem is called to instantiate the fragment for the given page.
        currentPage = position;
        return PageFragment.newInstance(position);
    }
}

Answer 1

您可以使用一个xml属性：

<TextView
  android:layout_width="match_parent"
  android:layout_height="200dp"
  app:autoSizeTextType="uniform" />

这是在Android 8中添加的，但包含在支持库中。 在此处查找更多相关内容： https : //developer.android.com/guide/topics/ui/look-and-feel/autosizing-textview.html