webView简易浏览器

标签：

package com.dream.myapplication;

import android.app.ProgressDialog;
import android.content.Intent;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private String url = "https://www.baidu.com";
    private WebView webView;
    private ProgressDialog dialog;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
       // Uri uri = Uri.parse(url);
       // Intent intent = new Intent(Intent.ACTION_VIEW,uri);
        //startActivity(intent);
        init();
    }
    private void init() {
        webView = (WebView) findViewById(R.id.web_view);
        webView.loadUrl(url);
        //webview中打开网页
        webView.setWebViewClient(new WebViewClient() {
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                //返回值为true的时候，控制网页在webView中打开，false调用系统/第三方浏览器
                view.loadUrl(url);
                return true;
            }
        });
       WebSettings settings = webView.getSettings();
        settings.setJavaScriptEnabled(true);
        //webview使用缓存加载
        settings.setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
        webView.setWebChromeClient(new WebChromeClient() {
            @Override
            public void onProgressChanged(WebView view, int newProgress) {
                if (newProgress == 100) {
                    //网页加载完毕，关闭
                    closeDialog();
                } else {
                    //网页加载中，打开Dialog
                    openDialog(newProgress);
                }
            }
        });
    }
    private void openDialog(int newProgress) {
        if(dialog==null){
            dialog = new ProgressDialog(this);
            dialog.setTitle("正在加载");
            dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
            dialog.setProgress(newProgress);
            dialog.show();
        }else{
            dialog.setProgress(newProgress);
        }
    }
    private void closeDialog() {
        if (dialog != null && dialog.isShowing()) {
            dialog.dismiss();
            dialog=null;
        }
    }
    //改写物理键返回的逻辑
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode==KeyEvent.KEYCODE_BACK){
            //Toast.makeText(this,webView.getUrl(),Toast.LENGTH_SHORT).show();
            if(webView.canGoBack()){
                webView.goBack();
                return true;
            }else {
                System.exit(0);
            }
        }
        return super.onKeyDown(keyCode, event);
    }
}

webView简易浏览器

标签：

原文地址：http://www.cnblogs.com/sansansan/p/5136731.html