android webview中上传控件点击无效的解决办法

一、介绍

当我们在使用webview控件打开一个web网页时，如果we页面中带有的控件，在webview中能正常显示这个上传控件，但是你会发现无论你如何点击都无效果，这个是很让人恼火的，一时也不知道如何下手去改，这里阿汤哥会告诉你如何解决该问题，如果我的解决办法能帮到你，请给我点掌声，并给你自己点掌声。

二、解决办法

第一步：重写WebChromeClient

webview的坑比较多，在这个上传文件的坑中遇到一个问题：

Android 5.0+ 重写onShowFileChooser生效；

Android 4.4   重写openFileChooser没有生效；

Android 4.4- 重写openFileChooser生效；

import android.net.Uri;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebView;

/**
 * Created by tangbin on 16/5/12.
 */
public class MyWebChromeClient extends WebChromeClient {

    private WebCall webCall;

    public void setWebCall(WebCall webCall) {
        this.webCall = webCall;
    }

    // For Android 3.0+
    public void openFileChooser(ValueCallback uploadMsg, String acceptType) {
        if (webCall != null)
            webCall.fileChose(uploadMsg);
    }

    // For Android < 3.0
    public void openFileChooser(ValueCallback uploadMsg) {
        openFileChooser(uploadMsg, "");
    }

    // For Android > 4.1.1
    public void openFileChooser(ValueCallback uploadMsg,
            String acceptType, String capture) {
        openFileChooser(uploadMsg, acceptType);
    }

    // For Android > 5.0
    @Override
    public boolean onShowFileChooser(WebView webView,
            ValueCallback filePathCallback,
            FileChooserParams fileChooserParams) {
        if (webCall != null)
            webCall.fileChose5(filePathCallback);
        return super.onShowFileChooser(webView, filePathCallback,
                fileChooserParams);
    }

    public interface WebCall {
        void fileChose(ValueCallback uploadMsg);

        void fileChose5(ValueCallback uploadMsg);
    }

}

第二步：监听ValueCallback

WebSettings webSettings = mWebView.getSettings();
        // 设置WebView属性，能够执行Javascript脚本
        webSettings.setJavaScriptEnabled(true);
        // 设置可以访问文件
        webSettings.setAllowFileAccess(true);
        mWebView.setWebViewClient(new webViewClient());

    public final static int FILECHOOSER_RESULTCODE = 1;
    public final static int FILECHOOSER_RESULTCODE_FOR_ANDROID_5 = 2;
    public ValueCallback mUploadMessage;
    public ValueCallback mUploadMessageForAndroid5;

    @Override
    public void fileChose(ValueCallback uploadMsg) {
        openFileChooserImpl(uploadMsg);
    }

    @Override
    public void fileChose5(ValueCallback uploadMsg) {
        openFileChooserImplForAndroid5(uploadMsg);
    }

    private void openFileChooserImpl(ValueCallback uploadMsg) {
        mUploadMessage = uploadMsg;
        Intent i = new Intent(Intent.ACTION_GET_CONTENT);
        i.addCategory(Intent.CATEGORY_OPENABLE);
        i.setType("image/*");
        startActivityForResult(Intent.createChooser(i, "File Chooser"),
                FILECHOOSER_RESULTCODE);
    }

    private void openFileChooserImplForAndroid5(ValueCallback uploadMsg) {
        mUploadMessageForAndroid5 = uploadMsg;
        Intent contentSelectionIntent = new Intent(Intent.ACTION_GET_CONTENT);
        contentSelectionIntent.addCategory(Intent.CATEGORY_OPENABLE);
        contentSelectionIntent.setType("image/*");

        Intent chooserIntent = new Intent(Intent.ACTION_CHOOSER);
        chooserIntent.putExtra(Intent.EXTRA_INTENT, contentSelectionIntent);
        chooserIntent.putExtra(Intent.EXTRA_TITLE, "Image Chooser");

        startActivityForResult(chooserIntent,
                FILECHOOSER_RESULTCODE_FOR_ANDROID_5);
    }

第三步：创建onActivityResult

    @Override
    protected void onActivityResult(int requestCode, int resultCode,
            Intent intent) {
        if (requestCode == FILECHOOSER_RESULTCODE) {
            if (null == mUploadMessage)
                return;
            Uri result = intent == null || resultCode != RESULT_OK ? null
                    : intent.getData();
            mUploadMessage.onReceiveValue(result);
            mUploadMessage = null;

        } else if (requestCode == FILECHOOSER_RESULTCODE_FOR_ANDROID_5) {
            if (null == mUploadMessageForAndroid5)
                return;
            Uri result = (intent == null || resultCode != RESULT_OK) ? null
                    : intent.getData();
            if (result != null) {
                mUploadMessageForAndroid5.onReceiveValue(new Uri[] { result });
            } else {
                mUploadMessageForAndroid5.onReceiveValue(new Uri[] {});
            }
            mUploadMessageForAndroid5 = null;
        }
    }

搞定，最后就可以如愿以偿的完成文件上传了功能了