Android使用webView長按保存下載網(wǎng)絡(luò)圖片

更新時間：2019年08月06日 10:49:37 作者：Sandy林

這篇文章主要為大家詳細(xì)介紹了Android使用webView長按保存下載網(wǎng)絡(luò)圖片，具有一定的參考價值，感興趣的小伙伴們可以參考一下

本文實例為大家分享了Android使用webView長按保存下載網(wǎng)絡(luò)圖片的具體代碼，供大家參考，具體內(nèi)容如下

最近發(fā)現(xiàn)在webView的setOnLongClickListener中可以獲取到WebView.HitTestResult，根據(jù)獲取的HitTestResult的Type來判斷做不同的處理。通過判斷Type的類型獲取點擊圖片的url，然后把圖片下載到本地，發(fā)送廣播通知系統(tǒng)圖庫進(jìn)行更新，在系統(tǒng)圖庫中查看下載的圖片。運(yùn)行Demo在網(wǎng)頁中對圖片做長按點擊即可下載網(wǎng)絡(luò)圖片

直接上代碼：

下面附有Demo下載：點擊打開鏈接

package demo.sam.webview_demo; 

import android.app.Activity; 
import android.app.Dialog; 
import android.content.Context; 
import android.content.DialogInterface; 
import android.content.Intent; 
import android.net.Uri; 
import android.os.Handler; 
import android.os.Message; 
import android.provider.MediaStore; 
import android.support.v7.app.AlertDialog; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.text.Editable; 
import android.util.Log; 
import android.view.KeyEvent; 
import android.view.View; 
import android.webkit.WebChromeClient; 
import android.webkit.WebResourceRequest; 
import android.webkit.WebSettings; 
import android.webkit.WebView; 
import android.webkit.WebViewClient; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.ProgressBar; 
import android.widget.Toast; 

import java.io.FileNotFoundException; 

public class MainActivity extends Activity { 

 private ProgressBar progress; 
 private WebView webView; 
 private EditText editText; 
 private Button click; 
 private Context context; 


 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  setContentView(R.layout.activity_main); 
  context= this; 
  initView(); 
  initData(); 
  initListener(); 



 } 

 private void initData() { 
  WebSettings settings = webView.getSettings(); 
  settings.setJavaScriptEnabled(true); 
  settings.setUseWideViewPort(true);//設(shè)置此屬性，可任意比例縮放 
  settings.setLoadWithOverviewMode(true); 
  // 使頁面支持縮放 
  settings.setBuiltInZoomControls(true); 
  settings.setSupportZoom(true); 
  //支持自動加載圖片 
  settings.setLoadsImagesAutomatically(true); 
  settings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.NORMAL);// 排版適應(yīng)屏幕 
  // 縮放按鈕 
  settings.setDisplayZoomControls(false); 

  webView.setWebViewClient(new WebViewClient(){ 

   // 頁面在當(dāng)前頁面跳轉(zhuǎn) 
   @Override 
   public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) { 
    return super.shouldOverrideUrlLoading(view, request); 
   } 

   // 頁面加載結(jié)束 
   @Override 
   public void onPageFinished(WebView view, String url) { 
    super.onPageFinished(view, url); 
    if(progress!=null){ 
     progress.setVisibility(View.GONE); 
    } 
   } 
  }); 

 } 

 private void initView() { 
  progress = (ProgressBar) findViewById(R.id.progress); 
  webView = (WebView) findViewById(R.id.webView); 
  editText = (EditText) findViewById(R.id.url); 
  click = (Button) findViewById(R.id.click); 
 } 

 private void initListener() { 
  // 網(wǎng)頁加載進(jìn)度顯示 
  webView.setWebChromeClient(new WebChromeClient(){ 
   @Override 
   public void onProgressChanged(WebView view, int newProgress) { 
    super.onProgressChanged(view, newProgress); 
    progress.setVisibility(View.VISIBLE); 
    progress.setProgress(newProgress); 
   } 
  }); 

  click.setOnClickListener(new View.OnClickListener() { 
   @Override 
   public void onClick(View view) { 
    Log.e("輸入的網(wǎng)站",editText.getText().toString().trim()); 
    webView.loadUrl(editText.getText().toString().trim()); 
   } 
  }); 

  // 長按點擊事件 
  webView.setOnLongClickListener(new View.OnLongClickListener() { 
   @Override 
   public boolean onLongClick(View view) { 
    final WebView.HitTestResult hitTestResult = webView.getHitTestResult(); 
    // 如果是圖片類型或者是帶有圖片鏈接的類型 
    if(hitTestResult.getType()== WebView.HitTestResult.IMAGE_TYPE|| 
      hitTestResult.getType()== WebView.HitTestResult.SRC_IMAGE_ANCHOR_TYPE){ 
     // 彈出保存圖片的對話框 
     AlertDialog.Builder builder = new AlertDialog.Builder(context); 
     builder.setTitle("提示"); 
     builder.setMessage("保存圖片到本地"); 
     builder.setPositiveButton("確認(rèn)", new DialogInterface.OnClickListener() { 
      @Override 
      public void onClick(DialogInterface dialogInterface, int i) { 
       String url = hitTestResult.getExtra(); 
       // 下載圖片到本地 
       DownPicUtil.downPic(url, new DownPicUtil.DownFinishListener(){ 

        @Override 
        public void getDownPath(String s) { 
         Toast.makeText(context,"下載完成",Toast.LENGTH_LONG).show(); 
         Message msg = Message.obtain(); 
         msg.obj=s; 
         handler.sendMessage(msg); 
        } 
       }); 

      } 
     }); 
     builder.setNegativeButton("取消", new DialogInterface.OnClickListener() { 
      // 自動dismiss 
      @Override 
      public void onClick(DialogInterface dialogInterface, int i) { 
      } 
     }); 
     AlertDialog dialog = builder.create(); 
     dialog.show(); 
    } 
    return true; 
   } 
  }); 

  webView.loadUrl("http://www.baidu.com"); 
 } 

 Handler handler =new Handler(){ 
  @Override 
  public void handleMessage(Message msg) { 
   super.handleMessage(msg); 
   String picFile = (String) msg.obj; 
   String[] split = picFile.split("/"); 
   String fileName = split[split.length-1]; 
   try { 
    MediaStore.Images.Media.insertImage(getApplicationContext().getContentResolver(), picFile, fileName, null); 
   } catch (FileNotFoundException e) { 
    e.printStackTrace(); 
   } 
   // 最后通知圖庫更新 
   getApplicationContext().sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + picFile))); 
   Toast.makeText(context,"圖片保存圖庫成功",Toast.LENGTH_LONG).show(); 
  } 
 }; 


 // 監(jiān)聽返回鍵返回網(wǎng)頁的上一層 
 @Override 
 public boolean onKeyDown(int keyCode, KeyEvent event) { 
  if(keyCode == KeyEvent.KEYCODE_BACK && webView.canGoBack()){ 
   if(webView != null){ 
    webView.goBack(); 
    return true; 
   } 
  } 
  return super.onKeyDown(keyCode, event); 
 } 

}

圖片下載的工具類

import android.os.AsyncTask; 
import android.os.Environment; 
import android.util.Log; 

import java.io.File; 
import java.io.FileNotFoundException; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.OutputStream; 
import java.net.URL; 
import java.util.Random; 

/** 
 * 圖片下載的工具類 
 */ 
public class DownPicUtil { 

 /** 
  *下載圖片，返回圖片的地址 
  * @param url 
  */ 
 public static void downPic(String url,DownFinishListener downFinishListener){ 
  // 獲取存儲卡的目錄 
  String filePath = Environment.getExternalStorageDirectory().getPath(); 
  File file = new File(filePath+File.separator+"webViewCache"); 
  if(!file.exists()){ 
   file.mkdir(); 
  } 

  loadPic(file.getPath(),url,downFinishListener); 

 } 

 private static void loadPic(final String filePath, final String url, final DownFinishListener downFinishListener) { 
  Log.e("下載圖片的url",url); 
  new AsyncTask<Void,Void,String>(){ 
   String fileName; 
   InputStream is; 
   OutputStream out; 

   @Override 
   protected String doInBackground(Void... voids) { 

    // 下載文件的名稱 
    String[] split = url.split("/"); 
    String newString = split[split.length - 1]; 
    fileName =newString.substring(newString.length()-20,newString.length()-1) ; 
    // 創(chuàng)建目標(biāo)文件,不是文件夾 
    File picFile = new File(filePath + File.separator + fileName); 
    if(picFile.exists()){ 
     return picFile.getPath(); 
    } 

    try { 
     URL picUrl = new URL(url); 
     //通過圖片的鏈接打開輸入流 
     is = picUrl.openStream(); 
     if(is==null){ 
      return null; 
     } 
     out = new FileOutputStream(picFile); 
     byte[] b=new byte[1024]; 
     int end ; 
     while ((end=is.read(b))!=-1){ 
      out.write(b,0,end); 
     } 

     Log.e("OK??","----------"); 
     if(is!=null){ 
      is.close(); 
     } 

     if(out!=null){ 
      out.close(); 
     } 

    } catch (FileNotFoundException e) { 
     e.printStackTrace(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 



    return picFile.getPath(); 
   } 

   @Override 
   protected void onPostExecute(String s) { 
    super.onPostExecute(s); 
    if(s!=null){ 
     downFinishListener.getDownPath(s); 
    } 
   } 
  }.execute(); 
 } 
 //下載完成回調(diào)的接口 
 public interface DownFinishListener{ 

  void getDownPath(String s); 
 } 
}

以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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