使用 WebView 直接用 控件选择相册图片

package com.moguzhuan.android.zhuan;

import android.annotation.TargetApi;

import android.app.Activity;

import android.content.ClipData;

import android.content.Intent;

import android.net.Uri;

import android.os.Build;

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.util.Log;

import android.webkit.ValueCallback;

import android.webkit.WebChromeClient;

import android.webkit.WebSettings;

import android.webkit.WebView;

import android.webkit.WebViewClient;

public class MainActivity extends AppCompatActivity {

    private final static String TAG = "MainActivity";

    private String TMP_URL = "http://m.zhuan.com";

    private WebView webview;

    private String MIME = "image/*";

    private ValueCallback<Uri> mUploadMessage;

    private ValueCallback<Uri[]> mUploadCallbackAboveL;

    private final static int FILECHOOSER_RESULTCODE = 1;

    private void assignViews() {

        webview = (WebView) findViewById(R.id.webview);

        WebSettings settings = webview.getSettings();

        settings.setUseWideViewPort(true);

        settings.setLoadWithOverviewMode(true);

        settings.setJavaScriptEnabled(true);

        settings.setSupportZoom(true);

        webview.setVerticalScrollBarEnabled(true);

        webview.setHorizontalScrollBarEnabled(true);

        webview.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;

            }

        });

        webview.setWebChromeClient(new WebChromeClient(){

            // For Android 3.0+

            public void openFileChooser(ValueCallback<Uri> uploadMsg) {

                Log.d(TAG, "openFileChoose(ValueCallback<Uri> uploadMsg)");

                mUploadMessage = uploadMsg;

                Intent i = new Intent(Intent.ACTION_GET_CONTENT);

                i.addCategory(Intent.CATEGORY_OPENABLE);

                i.setType(MIME);

                MainActivity.this.startActivityForResult(Intent.createChooser(i, "File Chooser"), FILECHOOSER_RESULTCODE);

            }

            // For Android 3.0+

            public void openFileChooser( ValueCallback uploadMsg, String acceptType ) {

                Log.d(TAG, "openFileChoose( ValueCallback uploadMsg, String acceptType )");

                mUploadMessage = uploadMsg;

                Intent i = new Intent(Intent.ACTION_GET_CONTENT);

                i.addCategory(Intent.CATEGORY_OPENABLE);

                i.setType(MIME);

                MainActivity.this.startActivityForResult(

                        Intent.createChooser(i, "File Browser"),

                        FILECHOOSER_RESULTCODE);

            }

            //For Android 4.1

            public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture){

                Log.d(TAG, "openFileChoose(ValueCallback<Uri> uploadMsg, String acceptType, String capture)");

                mUploadMessage = uploadMsg;

                Intent i = new Intent(Intent.ACTION_GET_CONTENT);

                i.addCategory(Intent.CATEGORY_OPENABLE);

                i.setType(MIME);

                MainActivity.this.startActivityForResult( Intent.createChooser( i, "File Browser" ), MainActivity.FILECHOOSER_RESULTCODE );

            }

            // For Android 5.0+

            public boolean onShowFileChooser (WebView webView, ValueCallback<Uri[]> filePathCallback, WebChromeClient.FileChooserParams fileChooserParams) {

                Log.d(TAG, "onShowFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture)");

                mUploadCallbackAboveL = filePathCallback;

                Intent i = new Intent(Intent.ACTION_GET_CONTENT);

                i.addCategory(Intent.CATEGORY_OPENABLE);

                i.setType(MIME);

                MainActivity.this.startActivityForResult(

                        Intent.createChooser(i, "File Browser"),

                        FILECHOOSER_RESULTCODE);

                return true;

            }

        });

        webview.loadUrl(TMP_URL);

    }

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        assignViews();

    }

    @Override

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        super.onActivityResult(requestCode, resultCode, data);

        if(requestCode==FILECHOOSER_RESULTCODE)

        {

            if (null == mUploadMessage && null == mUploadCallbackAboveL) return;

            Uri result = data == null || resultCode != RESULT_OK ? null : data.getData();

            if (mUploadCallbackAboveL != null) {

                onActivityResultAboveL(requestCode, resultCode, data);

            }

            else  if (mUploadMessage != null) {

                mUploadMessage.onReceiveValue(result);

                mUploadMessage = null;

            }

        }

    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)

    private void onActivityResultAboveL(int requestCode, int resultCode, Intent data) {

        if (requestCode != FILECHOOSER_RESULTCODE

                || mUploadCallbackAboveL == null) {

            return;

        }

        Uri[] results = null;

        if (resultCode == Activity.RESULT_OK) {

            if (data == null) {

            } else {

                String dataString = data.getDataString();

                ClipData clipData = data.getClipData();

                if (clipData != null) {

                    results = new Uri[clipData.getItemCount()];

                    for (int i = 0; i < clipData.getItemCount(); i++) {

                        ClipData.Item item = clipData.getItemAt(i);

                        results[i] = item.getUri();

                    }

                }

                if (dataString != null)

                    results = new Uri[]{Uri.parse(dataString)};

            }

        }

        mUploadCallbackAboveL.onReceiveValue(results);

        mUploadCallbackAboveL = null;

        return;

    }

}

assignViews 方法中需增加一段代码，让app使用默认的浏览器直接打开链接，否则会弹出选择第三方浏览器的窗口：

webview.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;

    }

});

参考：

https://gitcafe.com/saymagic/Webviewdemo/blob/master/app/src/main/java/cn/saymagic/webviewdemo/MainActivity.java

在 AndroidManifest.xml 中添加网络访问权限：

<uses-permission android:name="android.permission.INTERNET" />

另外，需要注意一点就是通过这种方式上传的图片，在服务端接收到的 MIME 类型为

application/octet-stream

而不是一般的 image/jpeg 这种哦