webview网页视图demo2

public class TestWebView extends AppCompatActivity { 
    TextView tv;
    WebView wv;
    Button bt;
    EditText et;
    String urlPrefix="https://";
    long exitTime;
    WebSettings setting;
    @Override
    protected void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.testwebview);
        init1();
    }

    public void init1() { 
        tv = findViewById(R.id.webviewtv);
        wv = findViewById(R.id.webviewwv);
        bt=findViewById(R.id.webviewwb);
        et=findViewById(R.id.webviewet);
        setting=wv.getSettings();
        setting.setUseWideViewPort(true);
        setting.setLoadWithOverviewMode(true);
        setting.setBuiltInZoomControls(true);
        setting.setDisplayZoomControls(false);
        setting.setSupportZoom(true);
        setting.setJavaScriptEnabled(true);

        wv.setWebChromeClient(new WebChromeClient(){ 
            @Override
            public void onReceivedTitle(WebView view, String title) { 
                super.onReceivedTitle(view, title);
                tv.setText(title);
            }
        });

        wv.setWebViewClient(new WebViewClient(){ 
            @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) { 
                view.loadUrl(request.getUrl().toString());
                return true;
            }
        });

        bt.setOnClickListener(new View.OnClickListener() { 
            @Override
            public void onClick(View v) { 
                String url = et.getText().toString();
                openURL(urlPrefix+url);
            }
        });


    }
    public void openURL(String url){ 
        wv.loadUrl(url);
    }

    @Override
    public void onBackPressed() { 
        if(wv.canGoBack()){ 
            wv.goBack();
        }else{ 
            if(System.currentTimeMillis()-exitTime>2000){ 
                Toast.makeText(getApplicationContext(),"再按一次退出程序",Toast.LENGTH_SHORT).show();
                exitTime=System.currentTimeMillis();
            }else{ 
                super.onBackPressed();
            }
        }
    }
}

本文地址：https://blog.csdn.net/weixin_43292547/article/details/110672034