Webview打开本地图片选择器解决方案

Webview打开本地图片选择器解决方案

Webview打开本地图片选择器十分之麻烦，其在安卓系统3x 4x 5x上的行为都不同，处理也不同，所以之前差点崩溃。经过测试和完善，最终其在各个版本上都能完美工作，特此开源出来，希望能帮到大家

• Webview
• FileChooser
• 返回键处理
• Android3.0之前版本
• Android3.x版本
• Android4.x版本
• Android5.x版本

代码块

public class BrowserActivity extends BaseActivity { public ValueCallback<Uri> mUploadMessage; public ValueCallback<Uri[]> mUploadMessageForAndroid5; public final static int FILECHOOSER_RESULTCODE = 1; public final static int FILECHOOSER_RESULTCODE_FOR_ANDROID_5 = 2; @Bind(R.id.webview) WebView webView; @Bind(R.id.titleBar) View view; ProgressDialog progressBar; @Override protected void setRootView() { super.setRootView(); setContentView(R.layout.activity_browser); } @Override protected void initData() { super.initData(); } @Override protected void initWidget() { super.initWidget(); progressBar = new ProgressDialog(this); progressBar.setProgressStyle(ProgressDialog.STYLE_SPINNER); webView.getSettings().setJavaScriptEnabled(true); webView.getSettings().setAppCacheEnabled(false); webView.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE); webView.loadUrl(getIntent().getStringExtra(CommonKeys.url.name())); webView.setWebViewClient(new WebViewClient() { @Override public boolean shouldOverrideUrlLoading(WebView view, String url) { //handler.sendEmptyMessage(0); view.loadUrl(url); return true; } }); webView.setWebChromeClient( new WebChromeClient() { public void onProgressChanged(WebView view, int progress) {// 载入进度改变而触发 if (progress == 100) { //handler.sendEmptyMessage(1);// 如果全部载入,隐藏进度对话框 } super.onProgressChanged(view, progress); } //扩展支持alert事件 @Override public boolean onJsAlert(WebView view, String url, String message, JsResult result) { AlertDialog.Builder builder = new AlertDialog.Builder(view.getContext()); builder.setTitle("xxx提示").setMessage(message).setPositiveButton("确定", null); builder.setCancelable(false); builder.setIcon(R.drawable.ic_launcher); AlertDialog dialog = builder.create(); dialog.show(); result.confirm(); return true; } //扩展浏览器上传文件 //3.0++版本 public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) { openFileChooserImpl(uploadMsg); } //3.0--版本 public void openFileChooser(ValueCallback<Uri> uploadMsg) { openFileChooserImpl(uploadMsg); } public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) { openFileChooserImpl(uploadMsg); } // For Android > 5.0 public boolean onShowFileChooser (WebView webView, ValueCallback<Uri[]> uploadMsg, WebChromeClient.FileChooserParams fileChooserParams) { openFileChooserImplForAndroid5(uploadMsg); return true; } } ); webView.addJavascriptInterface(new BrowserInterface(this), "BrowserInterface"); } private void openFileChooserImpl(ValueCallback<Uri> 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<Uri[]> 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); } @Override protected void initTopTitle() { view.setVisibility(View.GONE); } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if (webView.canGoBack() && event.getKeyCode() == KeyEvent.KEYCODE_BACK) { //获取历史列表 WebBackForwardList mWebBackForwardList = webView .copyBackForwardList(); //判断当前历史列表是否最顶端,其实canGoBack已经判断过 if (mWebBackForwardList.getCurrentIndex() > 0) { webView.goBack(); return true; } } return super.onKeyDown(keyCode, event); } @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;
        }
    }

    private Handler handler = new Handler() {
        public void handleMessage(Message msg) {// 定义一个Handler，用于处理下载线程与UI间通讯
            if (!Thread.currentThread().isInterrupted()){
                switch (msg.what) {
                    case 0:
                        progressBar.show();// 显示进度对话框
                        break;
                    case 1:
                        progressBar.hide();// 隐藏进度对话框，不可使用dismiss()、cancel(),否则再次调用show()时，显示的对话框小圆圈不会动。
                        break;
                }
            }

            super.handleMessage(msg);
        }
    };

}

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