webView截图保存到本地

package com.ebestmobile.app.longfigureinterception;

import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class MainActivity extends AppCompatActivity {
private Toolbar toolbar;
private WebView webView;
private Bitmap bitmap;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        toolbar = (Toolbar)findViewById(R.id.toolbar);
        webView = (WebView) findViewById(R.id.webView);
        setSupportActionBar(toolbar);
        setWebView();
    }

//设置webView
private void setWebView(){
        webView.loadUrl("http://www.sina.com.cn/");
        WebSettings webSettings = webView.getSettings();
//如果访问的页面中要与Javascript交互，则webview必须设置支持Javascript
        webSettings.setJavaScriptEnabled(true);
//设置自适应屏幕，两者合用
        webSettings.setUseWideViewPort(true); //将图片调整到适合webview的大小
        webSettings.setLoadWithOverviewMode(true); // 缩放至屏幕的大小
//缩放操作
        webSettings.setSupportZoom(true); //支持缩放，默认为true。是下面那个的前提。
        webSettings.setBuiltInZoomControls(true); //设置内置的缩放控件。若为false，则该WebView不可缩放
        webSettings.setDisplayZoomControls(false); //隐藏原生的缩放控件
//其他细节操作
        webSettings.setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK); //关闭webview中缓存
        webSettings.setAllowFileAccess(true); //设置可以访问文件
        webSettings.setJavaScriptCanOpenWindowsAutomatically(true); //支持通过JS打开新窗口
        webSettings.setLoadsImagesAutomatically(true); //支持自动加载图片
        webSettings.setDefaultTextEncodingName("utf-8");//设置编码格式
        webView.setWebViewClient(new WebViewClient(){
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
                view.loadUrl(url);
return super.shouldOverrideUrlLoading(view, url);
            }
        });
    }

//截图
private Bitmap captureScreenforRecord(){

        webView.measure(View.MeasureSpec.makeMeasureSpec(
                View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED),
                View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
        webView.layout(0, 0, webView.getMeasuredWidth(),
                webView.getMeasuredHeight());
        webView.setDrawingCacheEnabled(true);
        webView.buildDrawingCache();

        Bitmap bm = Bitmap.createBitmap(webView.getMeasuredWidth(),
                webView.getMeasuredHeight(), Bitmap.Config.RGB_565);

        Canvas bigcanvas = new Canvas(bm);
        Paint paint = new Paint();
int iHeight = bm.getHeight();
        bigcanvas.drawBitmap(bm, 0, iHeight, paint);
        webView.draw(bigcanvas);
return  bm;
    }

/**
 * 保存图片到手机上，并通知图库更新
 * @param context
 * @param bmp
 * @return
 */
public  String saveImageToGallery(Context context, Bitmap bmp) {
// 首先保存图片
        File appDir = new File(Environment.getExternalStorageDirectory(), "LongImage");
if (!appDir.exists()) {
            appDir.mkdir();
        }
        String fileName = System.currentTimeMillis() + ".png";
        File file = new File(appDir, fileName);
try {
            FileOutputStream fos = new FileOutputStream(file);
            bmp.compress(Bitmap.CompressFormat.JPEG, 100, fos);
            fos.flush();
            fos.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
// 最后通知图库更新
        String path = Environment.getExternalStorageDirectory() + "/ LongImage /"
                + fileName;
        context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + path)));
return Environment.getExternalStorageDirectory() + "/ LongImage/" + fileName;
    }

@Override
public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_item,menu);
return true;
    }

@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()){
case R.id.setting:
//截图
                bitmap = captureScreenforRecord();
if (bitmap!=null){
//保存图片
                    String path = saveImageToGallery(this,bitmap);
                    Toast.makeText(this, "图片截取成功，保存路径为："+path, Toast.LENGTH_SHORT).show();
                }
break;
// case R.id.share:
// //保存图片
// String path = saveImageToGallery(this,bitmap);
// Toast.makeText(this, "图片保存成功"+path, Toast.LENGTH_SHORT).show();
// break;
default:
break;
        }
return super.onOptionsItemSelected(item);
    }
}