【项目中---WebView】Webview打开本地图片文件选择解决方案

Webview打开本地图片选择器解决方案

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);
}
};

}