Android - 在 WebView 中选择文件按钮 [英] Android - Choose File button in WebView
问题描述
我在 WebView 中加载了一个页面时遇到了问题 - 我不会发布整个应用程序的代码，因为我的问题非常具体:我的 HTML 页面中的选择文件"按钮适用于 Android Studio 创建的模拟器，但不适用于其他地方.
I'm having a problem where I've got a page loaded in WebView - I'm not going to post code for the entire application, because my problem is very specific: the "Choose File" button in my HTML page works on the Android Studio created emulator, but nowhere else.
按钮运行此代码:
<input type='file' id='fileInput' accept='text/plain' onchange='openFile(event);'>
var openFile = function(event) {
var input = event.target;
var reader = new FileReader();
reader.onload = function(e){
/* various string parsing */
};
reader.readAsText(input.files[0]);
};
这在我的 API 23 模拟器上运行得非常好:单击该按钮会打开设备的默认文件选择器以选择一个文件.但是，在我的实际手机(即 API 16)上，单击此按钮没有任何作用.此外，在 API 18 的 Genymotion 模拟器上，单击按钮什么也不做.我能做些什么来解决这个问题吗?该按钮在我的手机和 Genymotion 模拟器上都不会产生错误消息，它只是坐在那里，没有任何反应.
This works perfectly fine on my emulator which is API 23: clicking the button opens the device's default File chooser to pick a file. However, on my actual phone, which is API 16, clicking this button does nothing. Furthermore, on a Genymotion emulator, which is API 18, clicking the button does nothing. Is there something I can do to fix this? The button produces no error messages on both my phone and the Genymotion emulator, it just sits there and nothing happens.
我需要应用程序在允许语音转文本的设备上运行，所以我不能只使用模拟器，随心所欲.
I need the app to work on a device that allows speech-to-text, so I can't only use the emulator, as much as I'd like to.
推荐答案
set WebChromeClient for Choose File
set WebChromeClient for Choose File
代码
import android.app.AlertDialog;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.webkit.JavascriptInterface;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ProgressBar;
import android.widget.Toast;
import org.apache.http.util.EncodingUtils;
public class BrowserScreen extends Activity {
private WebView webView;
private String url = "url";
private ValueCallback<Uri> mUploadMessage;
private final static int FILECHOOSER_RESULTCODE = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.browser_activity);
initFields();
setListeners();
}
public void initFields() {
// TODO Auto-generated method stub
webView = (WebView) findViewById(R.id.webView1);
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setBuiltInZoomControls(true);
webView.getSettings().setAllowFileAccess(true);
}
public void setListeners() {
// TODO Auto-generated method stub
webView.setWebViewClient(new WebViewClient() {
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
webView.loadUrl("about:blank");
view.clearHistory();
}
});
webView.setWebChromeClient(new WebChromeClient() {
public void onProgressChanged(WebView view, int progress) {
}
//The undocumented magic method override
//Eclipse will swear at you if you try to put @Override here
// For Android 3.0+
public void openFileChooser(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);
}
// For Android 3.0+
public void openFileChooser(ValueCallback uploadMsg, String acceptType) {
mUploadMessage = uploadMsg;
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("*/*");
startActivityForResult(
Intent.createChooser(i, "File Browser"),
FILECHOOSER_RESULTCODE);
}
//For Android 4.1
public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
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);
}
});
webView.loadUrl(url);
final MyJavaScriptInterface myJavaScriptInterface
= new MyJavaScriptInterface(this);
webView.addJavascriptInterface(myJavaScriptInterface, "AndroidFunction");
}
@Override
public void onBackPressed() {
// TODO Auto-generated method stub
if (webView.canGoBack() == true) {
webView.goBack();
} else {
super.onBackPressed();
}
}
public class MyJavaScriptInterface {
Context mContext;
MyJavaScriptInterface(Context c) {
mContext = c;
}
@JavascriptInterface
public void showToast(String toast) {
Toast.makeText(mContext, toast, Toast.LENGTH_SHORT).show();
// webView.loadUrl("javascript:document.getElementById("Button3").innerHTML = "bye";");
}
@JavascriptInterface
public void openAndroidDialog() {
AlertDialog.Builder myDialog
= new AlertDialog.Builder(BrowserScreen.this);
myDialog.setTitle("DANGER!");
myDialog.setMessage("You can do what you want!");
myDialog.setPositiveButton("ON", null);
myDialog.show();
}
}
@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;
}
}
}
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