Android(安卓)WebView

PrintWebActivity

package com.zkc.pinter.activity;import android.app.Activity;import android.content.Context;import android.content.Intent;import android.content.res.Resources;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Picture;import android.net.wifi.WifiManager;import android.os.Bundle;import android.os.Environment;import android.os.Message;import android.util.Log;import android.view.KeyEvent;import android.view.Menu;import android.view.View;import android.webkit.JavascriptInterface;import android.webkit.WebChromeClient;import android.webkit.WebSettings;import android.webkit.WebView;import android.webkit.WebViewClient;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;import com.example.btpdemo76.R;import java.io.FileOutputStream;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import com.zkc.helper.printer.*;/** * Created by NickChung on 3/20/15. */public class PrintWebActivity extends Activity {    public WebView newWebView = null;    List<Map<String, String>> listData = new ArrayList<Map<String, String>>();    private long firstTime = 0;    private String title;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_print_web);        title = getTitle().toString();        final EditText txtUrl = (EditText) findViewById(R.id.txtURL);        final WebView mWebView = (WebView) findViewById(R.id.wvSite);        final Button btnGo = (Button) findViewById(R.id.btnGo);        final Button btnGoBack = (Button) findViewById(R.id.btnGoBack);        final Button btnForward = (Button) findViewById(R.id.btnForward);        final Button btnReload = (Button) findViewById(R.id.btnReload);        mWebView.getSettings().setJavaScriptEnabled(true);        mWebView.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);        mWebView.addJavascriptInterface(new WebAppInterface(this), "android");        mWebView.getSettings().setSupportMultipleWindows(true);        mWebView.getSettings().setDisplayZoomControls(true);        mWebView.getSettings().setBuiltInZoomControls(true);        txtUrl.setText("http://www.ri-pai.com/AdminHellToBid/index.php/Index/Index.html");        //txtUrl.setText("http://192.168.0.106/bt.html");        if (!txtUrl.getText().toString().isEmpty()) {            mWebView.loadUrl(txtUrl.getText().toString());        }        mWebView.setWebViewClient(new WebViewClient() {            @Override            public boolean shouldOverrideUrlLoading(WebView view, String url) {                // TODO Auto-generated method stub                //返回值是true的时候控制去WebView打开，为false调用系统浏览器或第三方浏览器                view.loadUrl(url);                return true;            }            @Override            public void onPageStarted(WebView view, String url, Bitmap favicon) {                setTitle(title + "(Loading...)");                super.onPageStarted(view, url, favicon);            }            @Override            public void onPageFinished(WebView view, String url) {                setTitle(title + "(100%)");                super.onPageFinished(view, url);            }            @Override            public void onReceivedError(WebView view, int errorCode,                                        String description, String failingUrl) {                super.onReceivedError(view, errorCode, description, failingUrl);                view.loadDataWithBaseURL("about:blank"                        , "<a style="font-size: 36px;">访问出错，请检查：<br />1.WIFI是否已经连接 <br />2.网页地址是否正确 <br /<(^_^)</a>"                        , "text/html"                        , "UTF-8", null);            }        });        mWebView.setWebChromeClient(new MyWebChromeClient());        /*        mWebView.setWebChromeClient(new WebChromeClient() {            @Override            public void onProgressChanged(WebView view, final int newProgress) {                // TODO Auto-generated method stub                runOnUiThread(new Runnable() {                    @Override                    public void run() {                        setTitle(title + "(" + String.valueOf(newProgress) + "%)");                    }                });            }        });*/        btnGo.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                mWebView.loadUrl(txtUrl.getText().toString());            }        });        btnGoBack.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                mWebView.goBack();            }        });        btnForward.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                mWebView.goForward();            }        });        btnReload.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                mWebView.reload();            }        });        //PrintActivity.pl.printText(mWebView.getTitle() + "\r\n");        //PrintActivity.pl.printImage(BitmapFactory.decodeResource(getResources(), R.drawable.demo));    }    public boolean dispatchKeyEvent(KeyEvent event) {        // TODO Auto-generated method stub        if (event.getAction() == KeyEvent.ACTION_DOWN                && event.getKeyCode() == KeyEvent.KEYCODE_BACK) {            Intent i = new Intent(Intent.ACTION_MAIN);            i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);            i.addCategory(Intent.CATEGORY_HOME);            startActivity(i);            return true;//返回true，把事件消费掉，不会继续调用onBackPressed        }        return super.dispatchKeyEvent(event);    }    /*    @Override    public boolean onCreateOptionsMenu(Menu menu) {        super.onCreateOptionsMenu(menu);        Resources res = getResources();        String[] cmdStr = res.getStringArray(R.array.cmd);        for (int i = 0; i < cmdStr.length; i++) {            String[] cmdArray = cmdStr[i].split(",");            if (cmdArray.length == 2) {                Map<String, String> map = new HashMap<String, String>();                map.put("title", cmdArray[0]);                map.put("description", cmdArray[1]);                menu.add(0, i, i, cmdArray[0]);                listData.add(map);            }        }        return true;    }    @Override    public boolean onOptionsItemSelected(android.view.MenuItem item) {        Map map = listData.get(item.getItemId());        String cmd = map.get("description").toString();        byte[] bt = PrintCmdActivity.hexStringToBytes(cmd);        PrintActivity.pl.write(bt);        return false;    }*/}

LabelViewActivity

package com.zkc.pinter.activity;import android.app.Activity;import android.content.Intent;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Picture;import android.os.Bundle;import android.view.KeyEvent;import android.view.View;import android.webkit.WebSettings;import android.webkit.WebView;import android.webkit.WebViewClient;import android.widget.Button;import com.example.btpdemo76.R;import com.zkc.helper.printer.PrinterClass;import com.zkc.helper.printer.WebAppInterface;/** * Created by NickChung on 3/25/15. */public class LabelViewActivity extends Activity {    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_label_view);        final WebView mWebView = (WebView) findViewById(R.id.wvLabel);        final Button btnPrint = (Button) findViewById(R.id.btnPrint);        final Button btnCR = (Button) findViewById(R.id.btnCR);        final Button btnBack = (Button) findViewById(R.id.btnBack);        mWebView.getSettings().setJavaScriptEnabled(true);        mWebView.addJavascriptInterface(new WebAppInterface(this), "android");        mWebView.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);        mWebView.loadUrl(getIntent().getStringExtra("url"));        mWebView.setWebViewClient(new WebViewClient() {            @Override            public boolean shouldOverrideUrlLoading(WebView view, String url) {                // TODO Auto-generated method stub                //返回值是true的时候控制去WebView打开，为false调用系统浏览器或第三方浏览器                view.loadUrl(url);                return true;            }        });        btnBack.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //Intent it = new Intent(LabelViewActivity.this, PrintWebActivity.class);                //startActivity(it);                LabelViewActivity.this.onBackPressed();            }        });        btnCR.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                if(PrintActivity.pl.getState() != PrinterClass.STATE_CONNECTED) {                    Intent intent = new Intent(LabelViewActivity.this, MainActivity.class);                    startActivity(intent);                }                                byte[] bt = PrintCmdActivity.hexStringToBytes("0A");                PrintActivity.pl.write(bt);            }        });        btnPrint.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                if(PrintActivity.pl.getState() != PrinterClass.STATE_CONNECTED) {                    Intent intent = new Intent(LabelViewActivity.this, MainActivity.class);                    startActivity(intent);                }                Picture pic = mWebView.capturePicture();                int width = pic.getWidth();                int height = pic.getHeight();                if (width > 0 && height > 0) {                    Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);                    Canvas canvas = new Canvas(bmp);                    pic.draw(canvas);                    try {                        /*                        String fileName = Environment.getExternalStorageDirectory() + "/" + System.currentTimeMillis() + ".png";                        FileOutputStream fos = new FileOutputStream(fileName);                        if (fos != null) {                            bmp.compress(Bitmap.CompressFormat.PNG, 90, fos);                            fos.close();                        }                        Toast.makeText(getApplicationContext(), "截图成功，文件名是：" + fileName, Toast.LENGTH_SHORT).show();                        */                        PrintActivity.pl.printImage(bmp);                    } catch (Exception e) {                        e.printStackTrace();                    }                }            }        });    }    public boolean dispatchKeyEvent(KeyEvent event) {        // TODO Auto-generated method stub        if (event.getAction() == KeyEvent.ACTION_DOWN                && event.getKeyCode() == KeyEvent.KEYCODE_BACK) {            return true;//返回true，把事件消费掉，不会继续调用onBackPressed        }        return super.dispatchKeyEvent(event);    }}

WebAppInterface

package com.zkc.helper.printer;import android.content.Context;import android.content.Intent;import android.webkit.JavascriptInterface;import android.widget.Toast;import com.zkc.pinter.activity.LabelViewActivity;/** * Created by NickChung on 3/25/15. */public class WebAppInterface {    Context mContext;    /**     * Instantiate the interface and set the context     */    public WebAppInterface(Context c) {        mContext = c;    }    /**     * Show a toast from the web page     */    // 如果target 大于等于API 17，则需要加上如下注解    @JavascriptInterface    public void showWeb(String url) {        Intent intent = new Intent(mContext, LabelViewActivity.class);        intent.putExtra("url", url);        mContext.startActivity(intent);    }}

bt.html

<html><head><script type="text/javascript">  function showWeb(url){try{window.android.showWeb(url);}catch(ex){}}</script></head><body><input type="button" value="View" onclick="showWeb('http://www.ybidder.com/PrintTest.html');"></body></html>

MyWebChromeClient

package com.zkc.pinter.activity;import android.app.AlertDialog;import android.app.Dialog;import android.content.DialogInterface;import android.os.Handler;import android.os.Message;import android.view.Display;import android.view.LayoutInflater;import android.view.View;import android.view.Window;import android.view.WindowManager;import android.webkit.WebChromeClient;import android.webkit.WebSettings;import android.webkit.WebView;import android.webkit.WebViewClient;import android.widget.Button;import com.example.btpdemo76.R;//****************************************************************************public class MyWebChromeClient extends WebChromeClient {    public WebView newWebView = null;    @Override    public boolean onCreateWindow(WebView view, boolean dialog, boolean userGesture, Message resultMsg) {        newWebView = new WebView(view.getContext());        view.addView(newWebView);        WebSettings settings = newWebView.getSettings();        settings.setJavaScriptEnabled(true);        //这个setWebViewClient要加上，否则window.open弹出浏览器打开。        newWebView.setWebViewClient(new WebViewClient() {            @Override            public boolean shouldOverrideUrlLoading(WebView view, String url) {                View dlgView = LayoutInflater.from(view.getContext()).inflate(R.layout.popup, null);                WebView wvPop = (WebView) dlgView.findViewById(R.id.wvPop);                wvPop.setWebViewClient(new WebViewClient() {                    @Override                    public boolean shouldOverrideUrlLoading(WebView view, String url) {                        // TODO Auto-generated method stub                        //返回值是true的时候控制去WebView打开，为false调用系统浏览器或第三方浏览器                        view.loadUrl(url);                        return true;                    }                });                wvPop.loadUrl(url);                final AlertDialog dlg = new AlertDialog.Builder(view.getContext())                        .setIcon(R.drawable.ic_launcher)                        .setTitle(view.getTitle())                        .setView(dlgView)                        .setPositiveButton("返回",null)                        .create();                /*                Button btnExit = (Button) dlgView.findViewById(R.id.btnExit);                btnExit.setOnClickListener(new View.OnClickListener() {                    @Override                    public void onClick(View v) {                        dlg.cancel();                    }                });*/                dlg.show();                Window win = dlg.getWindow();                win.getDecorView().setPadding(0, 0, 0, 0);                WindowManager.LayoutParams lp = win.getAttributes();                lp.width = WindowManager.LayoutParams.MATCH_PARENT;                lp.height = WindowManager.LayoutParams.WRAP_CONTENT;                win.setAttributes(lp);                return true;            }        });        newWebView.setWebChromeClient(this);        WebView.WebViewTransport transport = (WebView.WebViewTransport) resultMsg.obj;        transport.setWebView(newWebView);        resultMsg.sendToTarget();        return true;    }    @Override    public void onCloseWindow(WebView view) {        if (newWebView != null) {            newWebView.setVisibility(View.GONE);            view.removeView(newWebView);        }    }}

Ref:Android WebView中的JavaScript代码使用

Ref:Android WebView与JavaScript交互操作（Demo）

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