有没有办法让Phonegap的File API像浏览器中的相同API一样工作？ 我需要与浏览器中相同的行为：点击“打开文件”按钮 - ＆gt; “选择文件”对话框 - ＆gt; ... - ＆gt;使用FileReader Object打开文件。
谢谢!!!
更新：我找到了一些解决方案。它打开文件对话框，它返回JS文件对象的名称。但是当我从PhoneGap将JS文件对象传递给FileReader时 - 它没有打开（onload listener永远不会触发）。我做错了什么？
这是我的Java：
package org.apache.cordova.example;
import android.os.Bundle;
import org.apache.cordova.api.CordovaInterface;
import android.content.Intent;
import android.net.Uri;
import android.webkit.ValueCallback;
import org.apache.cordova.CordovaChromeClient;
import org.apache.cordova.CordovaWebView;
import org.apache.cordova.DroidGap;
public class cordovaExample extends DroidGap
{
private ValueCallback<Uri> mUploadMessage;
private final static int FILECHOOSER_RESULTCODE = 1;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
super.loadUrl("file:///android_asset/www/index.html");
this.appView.setWebChromeClient(new FileAttachmentChromeClient(this, this.appView));
}
@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;
}
}
// openFileChooser is an overridable method in WebChromeClient which isn't
// included in the SDK's Android stub code
public class FileAttachmentChromeClient extends CordovaChromeClient {
public FileAttachmentChromeClient(CordovaInterface ctx, CordovaWebView app) {
super(ctx, app);
}
public void openFileChooser(ValueCallback<Uri> uploadMsg) {
mUploadMessage = uploadMsg;
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("*/*");
cordovaExample.this.startActivityForResult(Intent.createChooser(i, "Choose type of attachment"), FILECHOOSER_RESULTCODE);
}
}
}
我用JavaScript做什么：
var SelectedFile;
var FReader;
document.getElementById('fileBox').addEventListener('change', fileChosen);
function fileChosen(evnt) {
SelectedFile = evnt.target.files[0];
FReader = new FileReader();
FReader.readAsDataURL(SelectedFile);
FReader.onload = function(loadevnt){ .... } //never happens
}
答案 0 :(得分：1)
问题是大多数移动浏览器不支持文件对话框。 IIRC iOS 6是第一款支持此功能的移动浏览器。我确实在我的Corinthian项目中编写了一些代码，而不是在正在进行的开发中，它确实修补了这个功能。
首先，您需要编写一个Android插件来启动提供文件对话框的意图。我正在使用OI文件管理器。
package org.apache.cordova;
import org.apache.cordova.api.CallbackContext;
import org.apache.cordova.api.CordovaPlugin;
import org.apache.cordova.api.LOG;
import org.apache.cordova.api.PluginResult;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.HashMap;
/**
* This class exposes methods in DroidGap that can be called from JavaScript.
*/
public class App extends CordovaPlugin {
/**
* Executes the request and returns PluginResult.
*
* @param action The action to execute.
* @param args JSONArry of arguments for the plugin.
* @param callbackContext The callback context from which we were invoked.
* @return A PluginResult object with a status and message.
*/
public boolean execute(String action, JSONArray args, CallbackContext callbackContext) throws JSONException {
PluginResult.Status status = PluginResult.Status.OK;
String result = "";
try {
if (action.equals("clearCache")) {
this.clearCache();
}
else if (action.equals("show")) {
// This gets called from JavaScript onCordovaReady to show the webview.
// I recommend we change the name of the Message as spinner/stop is not
// indicative of what this actually does (shows the webview).
cordova.getActivity().runOnUiThread(new Runnable() {
public void run() {
webView.postMessage("spinner", "stop");
}
});
}
else if (action.equals("loadUrl")) {
this.loadUrl(args.getString(0), args.optJSONObject(1));
}
else if (action.equals("cancelLoadUrl")) {
this.cancelLoadUrl();
}
else if (action.equals("clearHistory")) {
this.clearHistory();
}
else if (action.equals("backHistory")) {
this.backHistory();
}
else if (action.equals("overrideButton")) {
this.overrideButton(args.getString(0), args.getBoolean(1));
}
else if (action.equals("overrideBackbutton")) {
this.overrideBackbutton(args.getBoolean(0));
}
else if (action.equals("exitApp")) {
this.exitApp();
}
callbackContext.sendPluginResult(new PluginResult(status, result));
return true;
} catch (JSONException e) {
callbackContext.sendPluginResult(new PluginResult(PluginResult.Status.JSON_EXCEPTION));
return false;
}
}
//--------------------------------------------------------------------------
// LOCAL METHODS
//--------------------------------------------------------------------------
/**
* Clear the resource cache.
*/
public void clearCache() {
this.webView.clearCache(true);
}
/**
* Load the url into the webview.
*
* @param url
* @param props Properties that can be passed in to the DroidGap activity (i.e. loadingDialog, wait, ...)
* @throws JSONException
*/
public void loadUrl(String url, JSONObject props) throws JSONException {
LOG.d("App", "App.loadUrl("+url+","+props+")");
int wait = 0;
boolean openExternal = false;
boolean clearHistory = false;
// If there are properties, then set them on the Activity
HashMap<String, Object> params = new HashMap<String, Object>();
if (props != null) {
JSONArray keys = props.names();
for (int i = 0; i < keys.length(); i++) {
String key = keys.getString(i);
if (key.equals("wait")) {
wait = props.getInt(key);
}
else if (key.equalsIgnoreCase("openexternal")) {
openExternal = props.getBoolean(key);
}
else if (key.equalsIgnoreCase("clearhistory")) {
clearHistory = props.getBoolean(key);
}
else {
Object value = props.get(key);
if (value == null) {
}
else if (value.getClass().equals(String.class)) {
params.put(key, (String)value);
}
else if (value.getClass().equals(Boolean.class)) {
params.put(key, (Boolean)value);
}
else if (value.getClass().equals(Integer.class)) {
params.put(key, (Integer)value);
}
}
}
}
// If wait property, then delay loading
if (wait > 0) {
try {
synchronized(this) {
this.wait(wait);
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}
this.webView.showWebPage(url, openExternal, clearHistory, params);
}
/**
* Cancel loadUrl before it has been loaded (Only works on a CordovaInterface class)
*/
@Deprecated
public void cancelLoadUrl() {
this.cordova.cancelLoadUrl();
}
/**
* Clear page history for the app.
*/
public void clearHistory() {
this.webView.clearHistory();
}
/**
* Go to previous page displayed.
* This is the same as pressing the backbutton on Android device.
*/
public void backHistory() {
cordova.getActivity().runOnUiThread(new Runnable() {
public void run() {
webView.backHistory();
}
});
}
/**
* Override the default behavior of the Android back button.
* If overridden, when the back button is pressed, the "backKeyDown" JavaScript event will be fired.
*
* @param override T=override, F=cancel override
*/
public void overrideBackbutton(boolean override) {
LOG.i("App", "WARNING: Back Button Default Behaviour will be overridden. The backbutton event will be fired!");
webView.bindButton(override);
}
/**
* Override the default behavior of the Android volume buttons.
* If overridden, when the volume button is pressed, the "volume[up|down]button" JavaScript event will be fired.
*
* @param button volumeup, volumedown
* @param override T=override, F=cancel override
*/
public void overrideButton(String button, boolean override) {
LOG.i("DroidGap", "WARNING: Volume Button Default Behaviour will be overridden. The volume event will be fired!");
webView.bindButton(button, override);
}
/**
* Return whether the Android back button is overridden by the user.
*
* @return boolean
*/
public boolean isBackbuttonOverridden() {
return webView.isBackButtonBound();
}
/**
* Exit the Android application.
*/
public void exitApp() {
this.webView.postMessage("exit", null);
}
}
package com.simonmacdonald.corinthian;
import org.apache.cordova.api.Plugin;
import org.apache.cordova.api.PluginResult;
import org.json.JSONArray;
import org.json.JSONObject;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.ActivityNotFoundException;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.util.Log;
public class FileDialog extends Plugin {
private static final int PICK_FILE_RESULT_CODE = 8974;
private static final int PICK_DIRECTORY_RESULT_CODE = 8975;
private static final String LOG_TAG = "FileDialog";
public String callbackId;
/**
* Executes the request and returns PluginResult.
*
* @param action The action to execute.
* @param args JSONArry of arguments for the plugin.
* @param callbackId The callback id used when calling back into JavaScript.
* @return A PluginResult object with a status and message.
*/
@Override
public PluginResult execute(String action, JSONArray args, String callbackId) {
this.callbackId = callbackId;
JSONObject options = args.optJSONObject(0);
if (action.equals("pickFile")) {
showDialog(options, PICK_FILE_RESULT_CODE);
} else if (action.equals("pickFolder")) {
showDialog(options, PICK_DIRECTORY_RESULT_CODE);
}
else {
return new PluginResult(PluginResult.Status.INVALID_ACTION);
}
PluginResult r = new PluginResult(PluginResult.Status.NO_RESULT);
r.setKeepCallback(true);
return r;
}
private void showDialog(JSONObject options, int type) {
Intent intent;
if (type == PICK_FILE_RESULT_CODE) {
intent = new Intent("org.openintents.action.PICK_FILE");
} else {
intent = new Intent("org.openintents.action.PICK_DIRECTORY");
}
if (options != null) {
String title = options.optString("title");
if (title != null) {
intent.putExtra("org.openintents.extra.TITLE", title);
}
String button = options.optString("button");
if (button != null) {
intent.putExtra("org.openintents.extra.BUTTON_TEXT", button);
}
}
//intent.setData(Uri.fromFile(new File("/")));
try {
this.cordova.startActivityForResult((Plugin)this,intent,PICK_FILE_RESULT_CODE);
} catch (ActivityNotFoundException e) {
showDownloadDialog();
}
}
private void showDownloadDialog() {
final Context context = this.cordova.getContext();
Runnable runnable = new Runnable() {
public void run() {
AlertDialog.Builder dialog = new AlertDialog.Builder(context);
dialog.setTitle("Install File Manager?");
dialog.setMessage("This requires the free OI File Manager app. Would you like to install it now?");
dialog.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dlg, int i) {
dlg.dismiss();
Intent intent = new Intent(Intent.ACTION_VIEW,
Uri.parse("market://search?q=pname:org.openintents.filemanager")
);
try {
context.startActivity(intent);
} catch (ActivityNotFoundException e) {
// We don't have the market app installed, so download it directly.
Intent in = new Intent(Intent.ACTION_VIEW);
in.setData(Uri.parse("http://openintents.googlecode.com/files/FileManager-1.2.apk"));
context.startActivity(in);
}
}
});
dialog.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dlg, int i) {
dlg.dismiss();
}
});
dialog.create();
dialog.show();
}
};
this.cordova.getActivity().runOnUiThread(runnable);
}
@Override
public void onActivityResult(int reqCode, int resultCode, Intent data) {
//super.onActivityResult(reqCode, resultCode, data);
//Log.d(LOG_TAG, "Data is " + data.getData().toString());
Log.d(LOG_TAG, "we are in on activity result");
switch (reqCode) {
case PICK_FILE_RESULT_CODE:
case PICK_DIRECTORY_RESULT_CODE: {
if (resultCode==Activity.RESULT_OK && data!=null && data.getData()!=null) {
String filePath = "file://" + data.getData().getPath();
Log.d(LOG_TAG, "The data is = " + filePath);
Log.d(LOG_TAG, "Calling succes with callback id = " + this.callbackId);
this.success(new PluginResult(PluginResult.Status.OK, filePath), this.callbackId);
}
break;
}
}
}
}
然后你需要编写JavaScript界面：
FileDialog: {
pickFile: function(successCallback, errorCallback, options) {
var win = typeof successCallback !== 'function' ? null : function(f) {
window.resolveLocalFileSystemURI(f, function(fileEntry) {
successCallback(fileEntry);
}, fail);
};
cordova.exec(win, errorCallback, "FileDialog", "pickFile", [options]);
},
pickFolder: function(successCallback, errorCallback, options) {
var win = typeof successCallback !== 'function' ? null : function(d) {
window.resolveLocalFileSystemURI(d, function(dirEntry) {
successCallback(dirEntry);
}, fail);
};
cordova.exec(win, errorCallback, "FileDialog", "pickFolder", [options]);
},
patch: function() {
var inputs = document.getElementsByTagName("input");
for (var i=0; i < inputs.length; i++) {
if (inputs[i].getAttribute('type') == 'file'){
var me = inputs[i];
inputs[i].addEventListener("click", function() {
corinthian.FileDialog.pickFile(function(fileEntry) {
me.value = fileEntry.fullPath;
});
});
}
}
}
}
最后通过调用FileDialog.patch（）;一旦您收到PhoneGap中的deviceready事件。
希望这会有所帮助......