WebView：如何在會話中保留用戶的縮放設置？

Question

我的應用使用WebView，用戶有時會調整縮放級別以使文字變大。但是，當活動關閉並且另一個開始時，縮放級別設置會丟失。

我看不到如何獲取和設置WebView的編程縮放級別，任何人都可以提出一種方法，這可以做到？

Answer 1

它我豪爾赫Grupo Reforma，這是我使用SharedPreferences執行的。

static final String PREFS_Zoom = "PREFS_Zoom"; 

private String zoomlevel; 
private int Default_zoomlevel=100; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     mWebView = (WebView) findViewById(R.id.webview);   

     GetZoom(); 
     mWebView.setInitialScale(Default_zoomlevel); 

     FrameLayout mContentView = (FrameLayout) getWindow().getDecorView().findViewById(android.R.id.content); 
     View zoom = mWebView.getZoomControls(); 
     mContentView.addView(zoom, ZOOM_PARAMS); 
     zoom.setVisibility(View.VISIBLE); 

     WebSettings webSettings = mWebView.getSettings(); 
     webSettings.setSavePassword(false); 
     webSettings.setSaveFormData(false); 
     webSettings.setJavaScriptEnabled(true); 
     webSettings.setSupportZoom(true); 

     mWebView.loadUrl("http://www.elnorte.com"); 
    } 



    private void GetZoom(){ 
     try{ 
     SharedPreferences settings = getSharedPreferences(PREFS_Zoom,0); 
      zoomlevel = settings.getString("zoom_level","");  
     if (zoomlevel.length() >0) 
     Default_zoomlevel = Integer.parseInt(zoomlevel);    
     else 
     Default_zoomlevel =100; 
     }catch(Exception ex){ 
     Log.e("******ZOOM ! ", "Exception GetZoom() ::"+ex.getMessage());   
     } 
    } 


    private void SaveZoom(){ 
     try{ 
     SharedPreferences settings = getSharedPreferences(PREFS_Zoom,0);    
     SharedPreferences.Editor editor = settings.edit();  
     Default_zoomlevel = (int) (mWebView.getScale() *100); 
     editor.putString("zoom_level",""+ Default_zoomlevel); 
     editor.commit(); 
     }catch(Exception ex){ 
     Log.e("******ZOOM ! ", "Exception SaveZoom() ::"+ex.getMessage());  
     } 
    } 


    public void finish() { 
     SaveZoom(); 
      super.finish();  
    } 

我希望這幫助

Answer 2

或許你可以嘗試：

http://d.android.com/reference/android/webkit/WebSettings.html#setDefaultZoom(android.webkit.WebSettings.ZoomDensity)

&

http://d.android.com/reference/android/webkit/WebSettings.html#getDefaultZoom()

我還沒有嘗試過自己，但看起來像它可能來自工作

Answer 3

豪爾赫給出的答案是當場上，除了SaveZoom理想不應finish()被調用（這是當活動被銷燬）。更好的縮放喜好保存方法是擴展WebView的WebViewClient，並覆蓋onScaleChanged()。所以繼續豪爾赫的onCreate方法：

public void onCreate(Bundle savedInstanceState) 
{ 

    .... 

    class MyWebViewClient extends WebViewClient 
    { 
     @Override 
     public void onScaleChanged(WebView wv, float oldScale, float newScale) 
     { 
      SaveZoom(); 
     } 
    } 

    mWebView.setWebViewClient(new MyWebViewClient()); 
}