本文实例为大家分享了Android使用webView长按保存下载网络图片的具体代码，供大家参考，具体内容如下

最近发现在webView的setOnLongClickListener中可以获取到WebView.HitTestResult，根据获取的HitTestResult的Type来判断做不同的处理。通过判断Type的类型获取点击图片的url，然后把图片下载到本地，发送广播通知系统图库进行更新，在系统图库中查看下载的图片。运行Demo在网页中对图片做长按点击即可下载网络图片

直接上代码：

下面附有Demo下载：点击打开链接

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);//设置此属性，可任意比例缩放

settings.setLoadWithOverviewMode(true);

// 使页面支持缩放

settings.setBuiltInZoomControls(true);

settings.setSupportZoom(true);

//支持自动加载图片

settings.setLoadsImagesAutomatically(true);

settings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.NORMAL);// 排版适应屏幕

// 缩放按钮

settings.setDisplayZoomControls(false);

webView.setWebViewClient(new WebViewClient(){

// 页面在当前页面跳转

@Override

public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {

return super.shouldOverrideUrlLoading(view, request);

}

// 页面加载结束

@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() {

// 网页加载进度显示

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("输入的网站",editText.getText().toString().trim());

webView.loadUrl(editText.getText().toString().trim());

}

});

// 长按点击事件

webView.setOnLongClickListener(new View.OnLongClickListener() {

@Override

public boolean onLongClick(View view) {

final WebView.HitTestResult hitTestResult = webView.getHitTestResult();

// 如果是图片类型或者是带有图片链接的类型

if(hitTestResult.getType()== WebView.HitTestResult.IMAGE_TYPE||

hitTestResult.getType()== WebView.HitTestResult.SRC_IMAGE_ANCHOR_TYPE){

// 弹出保存图片的对话框

AlertDialog.Builder builder = new AlertDialog.Builder(context);

builder.setTitle("提示");

builder.setMessage("保存图片到本地");

builder.setPositiveButton("确认", new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialogInterface, int i) {

String url = hitTestResult.getExtra();

// 下载图片到本地

DownPicUtil.downPic(url, new DownPicUtil.DownFinishListener(){

@Override

public void getDownPath(String s) {

Toast.makeText(context,"下载完成",Toast.LENGTH_LONG).show();

Message msg = Message.obtain();

msg.obj=s;

handler.sendMessage(msg);

}

});

}

});

builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {

// 自动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();

}

// 最后通知图库更新

getApplicationContext().sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + picFile)));

Toast.makeText(context,"图片保存图库成功",Toast.LENGTH_LONG).show();

}

};

// 监听返回键返回网页的上一层

@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);

}

}

图片下载的工具类

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;

/**

* 图片下载的工具类

*/

public class DownPicUtil {

/**

*下载图片，返回图片的地址

* @param url

*/

public static void downPic(String url,DownFinishListener downFinishListener){

// 获取存储卡的目录

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("下载图片的url",url);

new AsyncTask(){

String fileName;

InputStream is;

OutputStream out;

@Override

protected String doInBackground(Void... voids) {

// 下载文件的名称

String[] split = url.split("/");

String newString = split[split.length - 1];

fileName =newString.substring(newString.length()-20,newString.length()-1) ;

// 创建目标文件,不是文件夹

File picFile = new File(filePath + File.separator + fileName);

if(picFile.exists()){

return picFile.getPath();

}

try {

URL picUrl = new URL(url);

//通过图片的链接打开输入流

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();

}

//下载完成回调的接口

public interface DownFinishListener{

void getDownPath(String s);

}

}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。