android - WebView:如何跨 session 保留用户的缩放设置？

Question

我的应用使用 WebView，用户有时会调整缩放级别以使文本变大。但是，当 Activity 关闭并启动另一个 Activity 时，缩放级别设置会丢失。

我看不到如何在 WebView 上以编程方式获取和设置缩放级别，任何人都可以建议一种方法吗？

Answer 1

我是来自 Grupo Reforma 的 Jorge，这是我使用 SharedPreferences 的实现..

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();     
     }

希望对你有帮助