WebView

WebView

public class MainActivity extends AppCompatActivity {

    private TextView textView ;
    private WebView my_webview ;
    private long exitTime =0 ;

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

        textView = findViewById(R.id.textView);
        my_webview = findViewById(R.id.my_webview);
        my_webview.setWebChromeClient(new WebChromeClient(){
            @Override
            public void onReceivedTitle(WebView view, String title) {
                super.onReceivedTitle(view, title);
                textView.setText(title);
            }
        });
        my_webview.setWebViewClient(new WebViewClient(){
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {

                view.loadUrl(url);
                return true ;
            }
        });
        WebSettings webSettings = my_webview.getSettings();
        //设定支持 viewport
        webSettings.setUseWideViewPort(true);
        // 自适应屏幕
        webSettings.setLoadWithOverviewMode(true);
        webSettings.setBuiltInZoomControls(true);
        webSettings.setDisplayZoomControls(false);
        // 设定支持缩放
        webSettings.setSupportZoom(true);
        // 设置 webview 属性，运行执行js脚本
        webSettings.setJavaScriptEnabled(true);
        my_webview.loadUrl("https://blog.youkuaiyun.com/m0_57896648?spm=1001.2101.3001.5343");
    }

    //返回键设置
    @Override
    public void onBackPressed() {
        if (my_webview.canGoBack()){
            my_webview.goBack();
        }else {
            if (System.currentTimeMillis()- exitTime >2000){
                exitTime = System.currentTimeMillis();
            }else {
                super.onBackPressed();
            }
        }
    }
}