如何在Android中逐頁加載WebView中的數據

Question

我正在使用webview顯示html數據。如果數據小於（小於1 mb）則工作正常..我正在使用以下代碼

mDecryptDataWv.setWebViewClient(new WebViewClient() {


        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            DebugLog.i(TAG, "Processing webview url click...");
            view.loadUrl(url);
            return true;
        }

        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            // TODO Auto-generated method stub
            //showProgressDialog();
            DebugLog.i(TAG, "************onPageStarted **************");
        }

        @Override
        public void onPageFinished(WebView view, String url) {
            DebugLog.i(TAG, "************onPageFinished **************");

            if (mProgressDialog != null) {
                if (mProgressDialog.isShowing()) {
                    DebugLog.i(TAG, "mProgressDialog ::::::stopping");
                    mProgressDialog.dismiss();
                    mProgressDialog = null;

                }
            }

如果數據大於1MB，則需要花費更多時間來完成加載。因此，我的意圖是在用戶滾動進度對話框時逐頁加載數據。

Answer 1

//我使用了該類，並且我的代碼在我的身邊工作，請嘗試一下，可能會有所幫助

public class WebViewActivity extends Activity {
    private WebView webview;
    private static final String TAG = "Main";
    private ProgressDialog progressBar;
    private TextView header_maintext;
    private TextView headeroptiontext;
    private RelativeLayout back;
    private String url_string="http://www.google.com";
    private String header_maintext_string="Your text";  

    /** Called when the activity is first created. */
    @SuppressLint("SetJavaScriptEnabled") @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
         requestWindowFeature(Window.FEATURE_NO_TITLE);
         setContentView(R.layout.webview_layout);


        webview = (WebView)findViewById(R.id.webview01);
        header_maintext= (TextView)findViewById(R.id.header_maintext);
        header_maintext.setText(header_maintext_string);

        headeroptiontext = (TextView)findViewById(R.id.headeroptiontext);
        headeroptiontext.setVisibility(View.GONE);

        WebSettings settings = webview.getSettings();
        settings.setJavaScriptEnabled(true);
        webview.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
        webview.getSettings().setLoadWithOverviewMode(true);
        webview.getSettings().setUseWideViewPort(true);

          back = (RelativeLayout) findViewById(R.id.back_layout);
          back.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) 
            {
                // TODO Auto-generated method stub
                if(webview.canGoBack() == true)
                    {
                        webview.goBack();
                    }
                else
                    {
                        finish();
                    }
             }
        });

        final AlertDialog alertDialog = new AlertDialog.Builder(this).create();

        progressBar = ProgressDialog.show(WebViewActivity.this, "My application", "Loading...");

        webview.setWebViewClient(new WebViewClient() {
            public boolean shouldOverrideUrlLoading(WebView view, String url) {

                view.loadUrl(url);
                return true;
            }

            public void onPageFinished(WebView view, String url) {
                Log.i(TAG, "Finished loading URL: " +url);
                if (progressBar.isShowing()) {
                    progressBar.dismiss();
                }
            }

            public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {

                Toast.makeText(WebViewActivity.this, "Oh no! " + description, Toast.LENGTH_SHORT).show();
                alertDialog.setTitle("Error");
                alertDialog.setMessage(description);
                alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        return;
                    }
                });
                alertDialog.show();
            }
        });
        webview.loadUrl(url_string);


    }
    @Override

    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if(event.getAction() == KeyEvent.ACTION_DOWN){
            switch(keyCode)
            {
            case KeyEvent.KEYCODE_BACK:
                if(webview.canGoBack() == true){
                    webview.goBack();
                }else{
                    finish();
                }
                return true;
            }

        }
        return super.onKeyDown(keyCode, event);
    }
}