webview

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package com.example.administrator.webview;import android.app.ProgressDialog;import android.content.Intent;import android.net.Uri;import android.support.v7.app.ActionBarActivity;import android.os.Bundle;import android.util.Log;import android.view.KeyEvent;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.webkit.WebChromeClient;import android.webkit.WebSettings;import android.webkit.WebView;import android.webkit.WebViewClient;import android.widget.Button;import android.widget.EditText;public class MainActivity extends ActionBarActivity implements Button.OnClickListener{    private Button btn_open_system_browser;    private Button btn_webview;    private EditText editText;    private WebView webview;    private ProgressDialog progressDialog;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        btn_open_system_browser = (Button)findViewById(R.id.btn_open_system_browser);        btn_webview = (Button)findViewById(R.id.btn_webview);        editText = (EditText)findViewById(R.id.editText);        webview = (WebView)findViewById(R.id.webview);        btn_open_system_browser.setOnClickListener(this);        btn_webview.setOnClickListener(this);    }    @Override    public void onClick(View v) {        Uri uri = Uri.parse(editText.getText().toString());        switch (v.getId()){            case R.id.btn_open_system_browser:                /**                 * 打开系统浏览器                 */                Log.e("main","sys");                Intent intent = new Intent(Intent.ACTION_VIEW,uri);                startActivity(intent);                break;            case R.id.btn_webview:                Log.e("main", "webview");                //需要 访问网络的权限                webview.loadUrl(uri.toString()); //还是会在系统浏览器中打开                //网页在webview中打开                webview.setWebViewClient(new WebViewClient(){                    @Override                    public boolean shouldOverrideUrlLoading(WebView view, String url) {                        view.loadUrl(url);                        return true; //返回true 在webview中打开 返回false 在第三方中打开                    }                });                //启用javascript                WebSettings settings = webview.getSettings();                settings.setJavaScriptEnabled(true);                // 启用缓存                settings.setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);                //网页加载 loading 进度条                webview.setWebChromeClient(new WebChromeClient(){                    @Override                    public void onProgressChanged(WebView view, int newProgress) {                        if(newProgress == 100){                            closeDialog();                        }else{                            openDialog(newProgress);                        }                        super.onProgressChanged(view, newProgress);                    }                    private void closeDialog(){                        if(progressDialog != null && progressDialog.isShowing()){                            progressDialog.dismiss();                            progressDialog = null;                        }                    }                    private void openDialog(int newProgress){                        if(progressDialog == null){                            progressDialog = new ProgressDialog(MainActivity.this);                            progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);                            progressDialog.setTitle("网页加载中");                            progressDialog.setMessage("网页加载中,请稍后。。。");                            progressDialog.setIcon(R.mipmap.ic_launcher);                            progressDialog.setProgress(newProgress);                            progressDialog.show();                        }else{                            progressDialog.setProgress(newProgress);                        }                    }                });                break;        }    }    //返回键 重写 webview后退    @Override    public boolean onKeyDown(int keyCode, KeyEvent event) {        if(keyCode == KeyEvent.KEYCODE_BACK){            if(webview.canGoBack()){                Log.e("goBack", "yes");                webview.goBack();                return true;            }else{                Log.e("goBack","no");                System.exit(0);            }        }        return super.onKeyDown(keyCode, event);    }}
这里写图片描述
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