最近在维护一个项目,发现安卓里面的webview点击网页的<input type="file">类型的控件时,无论你多使劲点都发现无法弹出安卓原生文件选择界面,简直要崩溃了(主要是ios那边可以...)
刚开始以为是权限 问题,后来发现该有的权限都给了,而且也给webview支持了javaScript的设置,最后在想应该是webview哪里被限制了,最后通过一番资料查询,发现要重写WebChromeClient类里面的方法--||(为什么要这么麻烦)
先说一下执行的步骤:
1.通过webview.setWebChromeClient(),传入一个WebChromeClient的实现类,在WebChromeClient实现类里面我们要重写里面的openFileChooser方法,这个方法会在文件准备上传时进行回调。
2.在openFileChooser这个方法里面我们设置Intent打开支持第三方文件的应用
3.然后在ActivityResult将第三方应用提供的内容通过ValueCallback的存储形式回传给webview。
一言不合直接贴代码..
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("*/*");
MainActivity.this.startActivityForResult(Intent.createChooser(i, "File Chooser"), FILECHOOSER_RESULTCODE);
}
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("*/*");
MainActivity.this.startActivityForResult(
Intent.createChooser(i, "File Browser"),
FILECHOOSER_RESULTCODE);
}
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("*/*");
MainActivity.this.startActivityForResult( Intent.createChooser( i, "File Browser" ), MainActivity.FILECHOOSER_RESULTCODE );
}
因为openFileChooser有多个重载方法,所以我们都帮它复写..
接下来是ActivityForResult的方法实现
if(requestCode==FILECHOOSER_RESULTCODE)
{
if (null == mUploadMessage && null == mUploadCallbackAboveL) return;
Uri result = data == null || resultCode != RESULT_OK ? null : data.getData();
if (mUploadMessage != null) {
mUploadMessage.onReceiveValue(result);
mUploadMessage = null;
}
}
这样大致就可以实现webview文件上传功能了,
但是问题来了!!
你会发现安卓5.0以上的机器还是没有反应,后来发现它回调的不是openFileChooser而是onShowFileChooser!!挖槽,挖槽,挖槽。
这简直是一个大坑啊!!!~~~~直接看代码
// For Android 5.0+
public boolean onShowFileChooser (WebView webView, ValueCallback<Uri[]> filePathCallback, WebChromeClient.FileChooserParams fileChooserParams) {
mUploadCallbackAboveL = filePathCallback;
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("*/*");
MainActivity.this.startActivityForResult(
Intent.createChooser(i, "File Browser"),
FILECHOOSER_RESULTCODE);
return true;
}
});
ActivityForResult的方法也需要改下,应该它现在回调的是ValueCallback(Uri[])类型而不是ValueCallback(Uri)类型了、
@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;
}
这样就可以适配android5.0+的设备了,终于把坑填了......记录下来,防止继续掉坑~~~