Android问题汇总(遥远的回忆过去)

Android-WebView上传图片实现(5.0及以上相关问题

2019-08-14  本文已影响3人  MonkeyLei

最近小萌新需要实现“发布页面的加载以及处理成功、失败、添加图片等js回调”。基本的Js调用android本地方法,大家尝试尝试应该就了解个大概了。这块也没怎么深入,后面再深入看看吧!

随便看几个图就晓得了赛:

image

一般都是定义一个类来弄,感觉清爽点:

      /**
     * js调用android方法
     */
    class JsOperationLMPA {
        Activity mActivity;

        public JsOperationLMPA(Activity activity) {
            mActivity = activity;
        }

        /**
         * 发布失败,带参数
         *
         * @param _message
         */
        @JavascriptInterface
        public void uploadGoodsFailer(String _message) {
            showToast(_message);
        }

        /**
         * 发布成功,带参数
         *
         * @param _id
         */
        @JavascriptInterface
        public void uploadGoodsSuccess(final int _id) {
        }
    }

然后初始化下Webview相关设置:- Mixed Content问题要注意,视频播放不了可能就是这个问题!

     /**
     * 初始化Webview
     */
    private void initWebView(WebView webView) {
        ///< 开启JavaScript支持
        webView.getSettings().setJavaScriptEnabled(true);
        ///< 加入JS接口
        webView.addJavascriptInterface(new JsOperationLMPA(this), "uploadGoods");
        // 设置WebView是否支持使用屏幕控件或手势进行缩放,默认是true,支持缩放
        webView.getSettings().setSupportZoom(true);
        ///< 设置WebView是否使用其内置的变焦机制,该机制结合屏幕缩放控件使用,默认是false,不使用内置变焦机制。
        webView.getSettings().setBuiltInZoomControls(true);
        ///< 设置是否开启DOM存储API权限,默认false,未开启,设置为true,WebView能够使用DOM storage API
        webView.getSettings().setDomStorageEnabled(true);
        ///< 触摸焦点起作用.如果不设置,则在点击网页文本输入框时,不能弹出软键盘及不响应其他的一些事件。
        webView.requestFocus();
        ///< 设置此属性,可任意比例缩放,设置webview推荐使用的窗口
        webView.getSettings().setUseWideViewPort(false);
        ///< 设置webview加载的页面的模式,缩放至屏幕的大小
        webView.getSettings().setLoadWithOverviewMode(true);
        ///< 允许webview对文件的操作
        webView.getSettings().setAllowUniversalAccessFromFileURLs(true);
        webView.getSettings().setAllowFileAccess(true);
        webView.getSettings().setAllowFileAccessFromFileURLs(true);
        ///< 设置进度
        webView.setWebChromeClient(new LineMinePublishActivity.MyWebChromClient());
        ///< 设置加载状态
        webView.setWebViewClient(new LineMinePublishActivity.MyWebClient());
        // android 5.0以上默认不支持Mixed Content
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            webView.getSettings().setMixedContentMode(WebSettings.MIXED_CONTENT_ALWAYS_ALLOW);
        }
    }

至于其他相关问题,查查就好了!回调应该就ojbk了。

最后再处理下图片上传的方法的重写就好了,感谢 https://blog.csdn.net/fuzhongbin/article/details/78769527, 为了防止丢失以及方便使用,还是转载下网友的代码:

    /**
     * 自定义WebClient
     * 增加本地相册调用处理
     */
    private ValueCallback<Uri> mUploadMessage;
    private ValueCallback<Uri[]> uploadMessageAboveL;
    private static final int FILE_CHOOSER_RESULT_CODE = 12;

    private class MyWebChromClient extends WebChromeClient {
        @Override
        public void onProgressChanged(WebView view, int newProgress) {
            super.onProgressChanged(view, newProgress);
        }

        // For Android 3.0+
        public void openFileChooser(ValueCallback<Uri> uploadMsg) {
            mUploadMessage = uploadMsg;
            openImageChooserActivity();
        }

        // For Android 3.0+
        public void openFileChooser(ValueCallback uploadMsg, String acceptType) {
            mUploadMessage = uploadMsg;
            openImageChooserActivity();
        }

        // For Android 4.1
        public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
            mUploadMessage = uploadMsg;
            openImageChooserActivity();
        }

        // For Android >= 5.0
        @Override
        public boolean onShowFileChooser(WebView webView,
                                         ValueCallback<Uri[]> filePathCallback,
                                         WebChromeClient.FileChooserParams fileChooserParams) {
            uploadMessageAboveL = filePathCallback;
            openImageChooserActivity();
            return true;
        }
    }

    /**
     * 打开本地相册
     */
    private void openImageChooserActivity() {
        Intent i = new Intent(Intent.ACTION_GET_CONTENT);
        i.addCategory(Intent.CATEGORY_OPENABLE);
        i.setType("image/*");
        startActivityForResult(Intent.createChooser(i, "Image Chooser"), FILE_CHOOSER_RESULT_CODE);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == FILE_CHOOSER_RESULT_CODE) {
            if (null == mUploadMessage && null == uploadMessageAboveL) return;
            Uri result = data == null || resultCode != RESULT_OK ? null : data.getData();
            if (uploadMessageAboveL != 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 intent) {
        if (requestCode != FILE_CHOOSER_RESULT_CODE || uploadMessageAboveL == null)
            return;
        Uri[] results = null;
        if (resultCode == Activity.RESULT_OK) {
            if (intent != null) {
                String dataString = intent.getDataString();
                ClipData clipData = intent.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)};
            }
        }
        uploadMessageAboveL.onReceiveValue(results);
        uploadMessageAboveL = null;
    }   
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