WebViewスクロール位置？

Question

私はこのコードを持っている::

//Scroll position from last time 
    String scrollPos = intent.getExtras().getString("SCROLL"); 
    //chapter position from last time (this is a book app) 
    String chapterPos = intent.getExtras().getString("EXTRA"); 
    //this methode changes the webView content according to last chapter visited (it works fine) 
    doItNow(chapterPos); 

    // PROBLEM IS HERE !!!! 
    if(scrollPos!=null) { 

     float webviewsize = webView.getContentHeight() - webView.getTop(); 
     float positionInWV = webviewsize * (Float.parseFloat(scrollPos)); 
     int positionY = Math.round(webView.getTop() + positionInWV); 
     webView.scrollTo(0, positionY); 
    } 

私はWebViewのは、最後のスクロール位置に自動的にスクロールさせたいです？それは動作しません??

EDIT これが今の私の完全な活動である::::::::::::::::::::::::::::::::::: ::::::

public class book extends AppCompatActivity { 

private String extra; 
private WebView webView; 
private TextView textView; 
private Intent intent; 
private LinearLayout Linear1; 
private RelativeLayout Relative1; 
private int colorId; 
private LayoutInflater inflater; 
private View layout; 
private TextView text; 
private Toast toast; 
public int flag; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_book); 

    textView = (TextView)findViewById(R.id.textView3); 
    webView = (WebView)this.findViewById(R.id.webView); 
    Linear1 = (LinearLayout)findViewById(R.id.Linear1); 
    Relative1 = (RelativeLayout)findViewById(R.id.Relative1); 

    Typeface face = Typeface.createFromAsset(getAssets(), 
      "fonts/arabicfont.otf"); 
    textView.setTypeface(face); 

    intent = getIntent(); 
    colorId = intent.getIntExtra("COLOR_EXTRA", colorId); 

    Linear1.setBackgroundResource(colorId); 
    Relative1.setBackgroundResource(colorId); 

    String chapterPos = intent.getExtras().getString("EXTRA"); 

    doItNow(chapterPos); 

    webView.setWebViewClient(new WebViewClient(){ 

            @Override 
            public void onPageFinished(WebView view, String url) { 
             super.onPageFinished(view, url); 
             String scrollPos = intent.getExtras().getString("SCROLL"); 
             Toast.makeText(book.this, scrollPos, Toast.LENGTH_SHORT).show(); 
             float webviewsize = webView.getContentHeight() - webView.getTop(); 
             float positionInWV = webviewsize * (Float.parseFloat(scrollPos)); 
             int positionY = Math.round(webView.getTop() + positionInWV); 
             webView.scrollTo(0, positionY); 
            } 

           } 
    ); 

} 

public void sectionsFnc(View view) { 
    Intent intent = new Intent(book.this, storyZero.class); 
    intent.putExtra("COLOR_EXTRA", colorId); 
    startActivity(intent); 
} 

public void backFunc(View view) { 
    Intent intent = new Intent(book.this, FirstScreen.class); 
    startActivity(intent); 
} 

public void nextStory(View view) { 

    int iExtra = Integer.parseInt(extra) + 1; 

    if(iExtra<=10) { 
     extra = String.valueOf(iExtra); 
     doItNow(extra); 
    } else { 
     inflater = getLayoutInflater(); 
     layout = inflater.inflate(R.layout.toast, 
       (ViewGroup) findViewById(R.id.toast_root)); 

     text = (TextView) layout.findViewById(R.id.text); 
     text.setText("لقد وصلت لنهاية الكتاب!"); 

     toast = new Toast(getApplicationContext()); 
     toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0); 
     toast.setDuration(Toast.LENGTH_SHORT); 
     toast.setView(layout); 
     toast.show(); 
    } 
} 

public void preStory(View view) { 
    int iExtra = Integer.parseInt(extra) - 1; 
    if(iExtra>=0) { 
     extra = String.valueOf(iExtra); 
     doItNow(extra); 
    } else { 
     inflater = getLayoutInflater(); 
     layout = inflater.inflate(R.layout.toast, 
       (ViewGroup) findViewById(R.id.toast_root)); 

     text = (TextView) layout.findViewById(R.id.text); 
     text.setText("أنت في بداية الكتاب!"); 

     toast = new Toast(getApplicationContext()); 
     toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0); 
     toast.setDuration(Toast.LENGTH_SHORT); 
     toast.setView(layout); 
     toast.show(); 
    } 
} 

private float calculateProgression(WebView content) { 
    float positionTopView = content.getTop(); 
    float contentHeight = content.getContentHeight(); 
    float currentScrollPosition = content.getScrollY(); 
    float percentWebview = (currentScrollPosition - positionTopView)/contentHeight; 
    return percentWebview; 
} 

@Override 
protected void onStop() { 
    float position = calculateProgression(webView); 
    SharedPreferences sharePref = getSharedPreferences("webviewScroll", Context.MODE_PRIVATE); 
    SharedPreferences.Editor editor = sharePref.edit(); 
    editor.putFloat("SCROLLPOS", position); 
    editor.putInt("CHAPTER", flag); 
    editor.commit(); 
    super.onStop(); 
} 

public void doItNow(String mExtra) { 

    extra = mExtra; 

    if(extra.equals("0")) { 
     webView.loadUrl("file:///android_asset/1.htm"); 
     flag = 0; 

    } else if(extra.equals("1")) { 
     webView.loadUrl("file:///android_asset/2.htm"); 
     flag = 1; 

    } else if(extra.equals("2")) { 
     webView.loadUrl("file:///android_asset/3.htm"); 
     flag = 2; 

    } else if(extra.equals("3")) { 
     webView.loadUrl("file:///android_asset/4.htm"); 
     flag = 3; 
    } else if(extra.equals("4")) { 
     webView.loadUrl("file:///android_asset/5.htm"); 
     flag = 4; 

    } else if(extra.equals("5")) { 
     webView.loadUrl("file:///android_asset/6.htm"); 
     flag = 5; 

    } else if(extra.equals("6")) { 
     webView.loadUrl("file:///android_asset/7.htm"); 
     flag = 6; 

    } else if(extra.equals("7")) { 
     webView.loadUrl("file:///android_asset/8.htm"); 
     flag = 7; 

    } else if(extra.equals("8")) { 
     webView.loadUrl("file:///android_asset/9.htm"); 
     flag = 8; 

    } else if(extra.equals("9")) { 
     webView.loadUrl("file:///android_asset/10.htm"); 
     flag = 9; 

    } else if(extra.equals("10")) { 
     webView.loadUrl("file:///android_asset/11.htm"); 
     flag = 10; 
    } 
} 

} 

Answer 1

問題を識別するために、あなたの完全なコードを貼り付けますが、私はWebViewのは、このケースでは、あなたが

を使用する必要がありますので、ページのロード終了前にscrollToを呼び出していることを推測しているしてください

yourWebView.setWebViewClient(new WebViewClient(){ 

     @Override 
     public void onPageFinished(WebView view, String url) { 
      super.onPageFinished(view, url); 
      yourWebView.scrollTo(xVal, yVal); 
     } 

    } 
    ); 

あなたのページに画像が含まれている場合、これを使用できます。

yourWebView.setPictureListener(new PictureListener() { 

     @Override 
     public void onNewPicture(WebView view, Picture picture) { 
      yourWebView.scrollTo(xVal, yVal); 

     } 
    });