我使用webview将我的网站成功迁移到了一个Android应用程序。我的网站要求您上传照片，但无法从我的应用访问本地文件或Android相机。我如何使其工作？
这是我的MainActivity.java
package com.example.oscar.lostnfound;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Environment;
import android.os.Parcelable;
import android.provider.MediaStore;
import android.view.View;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.webkit.ConsoleMessage;
import android.webkit.JavascriptInterface;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.RelativeLayout;
import android.widget.Toast;
import java.io.File;
public class MainActivity extends Activity {
private WebView webView;
private ProgressBar progress;
Button button;
final Activity activity = this;
public Uri imageUri;
public static final int FILECHOOSER_RESULTCODE = 2888;
public ValueCallback<Uri> mUploadMessage;
public Uri mCapturedImageURI = null;
// @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.webview);
webView = (WebView) findViewById(R.id.webView);
//webView.setWebViewClient(new MyWebViewClient());
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setLoadWithOverviewMode(true);
//other webview settings
webView.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
webView.setScrollbarFadingEnabled(false);
webView.getSettings().setBuiltInZoomControls(true);
webView.getSettings().setPluginState(WebSettings.PluginState.ON);
webView.getSettings().setAllowFileAccess(true);
webView.getSettings().setSupportZoom(true);
String url = "http://codeupset.com/academy-form";
webView.loadUrl(url);
progress = (ProgressBar) findViewById(R.id.progress);
startWebView();
}
@Override
public void onBackPressed() {
if (webView.canGoBack()) {
webView.goBack();
} else {
super.onBackPressed();
}
}
@JavascriptInterface
public void startWebView(){
webView.setWebViewClient(new WebViewClient() {
//@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
boolean bReceivedError = false;
//@Override
public void onReceivedError(WebView view, int errorCode,
String description, String failingUrl) {
bReceivedError = true;
setContentView(R.layout.error);
button = (Button) findViewById(R.id.button);
Toast.makeText(getApplicationContext(), "Check Internet connection",
Toast.LENGTH_LONG).show();
//On click listener
View.OnClickListener retry = new View.OnClickListener() {
@Override
public void onClick(View v) {
webView = (WebView) findViewById(R.id.webView);
setContentView(R.layout.webview);
String url = "http://codeupset.com";
webView.loadUrl(url);
}
};
// set OnClickListner for the button
button.setOnClickListener(retry);
}
//@Override
public void onPageFinished(WebView view, String url) {
progress.setVisibility(View.GONE);
MainActivity.this.progress.setProgress(100);
super.onPageFinished(view, url);
}
// @Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
progress.setVisibility(View.VISIBLE);
MainActivity.this.progress.setProgress(0);
super.onPageStarted(view, url, favicon);
}
});
webView.setWebChromeClient(new WebChromeClient() {
// openFileChooser for Android 3.0+
@JavascriptInterface
public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) {
// Update message
mUploadMessage = uploadMsg;
try {
// Create AndroidExampleFolder at sdcard
File imageStorageDir = new File(
Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES)
, "AndroidExampleFolder");
if (!imageStorageDir.exists()) {
// Create AndroidExampleFolder at sdcard
imageStorageDir.mkdirs();
}
// Create camera captured image file path and name
File file = new File(
imageStorageDir + File.separator + "IMG_"
+ String.valueOf(System.currentTimeMillis())
+ ".jpg");
mCapturedImageURI = Uri.fromFile(file);
// Camera capture image intent
final Intent captureIntent = new Intent(
android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
captureIntent.putExtra(MediaStore.EXTRA_OUTPUT, mCapturedImageURI);
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("image/*");
// Create file chooser intent
Intent chooserIntent = Intent.createChooser(i, "Image Chooser");
// Set camera intent to file chooser
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS
, new Parcelable[]{captureIntent});
// On select image call onActivityResult method of activity
startActivityForResult(chooserIntent, FILECHOOSER_RESULTCODE);
} catch (Exception e) {
Toast.makeText(getBaseContext(), "Exception:" + e,
Toast.LENGTH_LONG).show();
}
}
// openFileChooser for Android < 3.0
@JavascriptInterface
public void openFileChooser(ValueCallback<Uri> uploadMsg) {
openFileChooser(uploadMsg, "");
}
//openFileChooser for other Android versions
@JavascriptInterface
public void openFileChooser(ValueCallback<Uri> uploadMsg,
String acceptType,
String capture) {
openFileChooser(uploadMsg, acceptType);
}
// The webPage has 2 filechoosers and will send a
// console message informing what action to perform,
// taking a photo or updating the file
public boolean onConsoleMessage(ConsoleMessage cm) {
onConsoleMessage(cm.message(), cm.lineNumber(), cm.sourceId());
return true;
}
}); // End setWebChromeClient
}
// Return here when file selected from camera or from SDcard
@Override
@JavascriptInterface
protected void onActivityResult(int requestCode, int resultCode,
Intent intent) {
if(requestCode==FILECHOOSER_RESULTCODE)
{
if (null == this.mUploadMessage) {
return;
}
Uri result=null;
try{
if (resultCode != RESULT_OK) {
result = null;
} else {
// retrieve from the private variable if the intent is null
result = intent == null ? mCapturedImageURI : intent.getData();
}
}
catch(Exception e)
{
Toast.makeText(getApplicationContext(), "activity :"+e,
Toast.LENGTH_LONG).show();
}
mUploadMessage.onReceiveValue(result);
mUploadMessage = null;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
public void setValue(int progress) {
this.progress.setProgress(progress);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
这是我的Xml（webview.xml）
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">
<WebView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/webView"
android:layout_gravity="center_vertical" />
<ProgressBar
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/progress"
android:layout_centerVertical="true"
android:indeterminate="false" />
</RelativeLayout>
logcat的
04-16 09:30:56.116 28887-28887/com.example.oscar.lostnfound I/SnapScrollController﹕ setSnapScrollingMode case-default no-op
04-16 09:30:56.251 28887-28887/com.example.oscar.lostnfound I/SnapScrollController﹕ setSnapScrollingMode case-default no-op
04-16 09:30:56.266 28887-28887/com.example.oscar.lostnfound I/ScaleGestureDetector﹕ TwScaleGestureDetector
04-16 09:31:58.906 28887-28887/com.example.oscar.lostnfound W/IInputConnectionWrapper﹕ showStatusIcon on inactive InputConnection
04-16 09:32:42.196 30041-30041/com.example.oscar.lostnfound W/ApplicationPackageManager﹕ getCSCPackageItemText()
04-16 09:32:42.201 30041-30041/com.example.oscar.lostnfound I/PersonaManager﹕ getPersonaService() name persona_policy
04-16 09:32:42.281 30041-30041/com.example.oscar.lostnfound V/WebViewChromium﹕ Binding Chromium to the background looper Looper (main, tid 1) {431a6968}
04-16 09:32:42.286 30041-30041/com.example.oscar.lostnfound I/chromium﹕ [INFO:library_loader_hooks.cc(112)] Chromium logging enabled: level = 0, default verbosity = 0
04-16 09:32:42.286 30041-30041/com.example.oscar.lostnfound I/BrowserProcessMain﹕ Initializing chromium process, renderers=0
04-16 09:32:42.301 30041-30072/com.example.oscar.lostnfound W/chromium﹕ [WARNING:proxy_service.cc(888)] PAC support disabled because there is no system implementation
04-16 09:32:42.301 30041-30041/com.example.oscar.lostnfound W/ApplicationPackageManager﹕ getCSCPackageItemText()
04-16 09:32:42.656 30041-30041/com.example.oscar.lostnfound D/OpenGLRenderer﹕ Enabling debug mode 0
04-16 09:32:42.671 30041-30041/com.example.oscar.lostnfound D/ProgressBar﹕ updateDrawableBounds: left = 468
04-16 09:32:42.671 30041-30041/com.example.oscar.lostnfound D/ProgressBar﹕ updateDrawableBounds: top = 0
04-16 09:32:42.671 30041-30041/com.example.oscar.lostnfound D/ProgressBar﹕ updateDrawableBounds: right = 612
04-16 09:32:42.671 30041-30041/com.example.oscar.lostnfound D/ProgressBar﹕ updateDrawableBounds: bottom = 144
04-16 09:32:42.681 30041-30041/com.example.oscar.lostnfound W/AwContents﹕ nativeOnDraw failed; clearing to background color.
04-16 09:32:42.941 30041-30041/com.example.oscar.lostnfound I/chromium﹕ [INFO:async_pixel_transfer_manager_android.cc(56)] Async pixel transfers not supported
04-16 09:32:43.016 30041-30041/com.example.oscar.lostnfound I/chromium﹕ [INFO:async_pixel_transfer_manager_android.cc(56)] Async pixel transfers not supported
答案 0 :(得分：0)
试试这个，
activity_main.xml： -
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="10dp" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:padding="5dp" >
<Button
android:id="@+id/btnSelectPhoto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Select Photo" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="10dp" >
<ImageView
android:id="@+id/viewImage"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
</LinearLayout>
现在创建这样的主要活动： -
public class MainActivity extends Activity {
ImageView viewImage;
Button b;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
b=(Button)findViewById(R.id.btnSelectPhoto);
viewImage=(ImageView)findViewById(R.id.viewImage);
b.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
selectImage();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds options to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
private void selectImage() {
final CharSequence[] options = { "Take Photo", "Choose from Gallery","Cancel" };
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("Add Photo!");
builder.setItems(options, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int item) {
if (options[item].equals("Take Photo"))
{
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File f = new File(android.os.Environment.getExternalStorageDirectory(), "temp.jpg");
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f));
startActivityForResult(intent, 1);
}
else if (options[item].equals("Choose from Gallery"))
{
Intent intent = new Intent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, 2);
}
else if (options[item].equals("Cancel")) {
dialog.dismiss();
}
}
});
builder.show();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK) {
if (requestCode == 1) {
File f = new File(Environment.getExternalStorageDirectory().toString());
for (File temp : f.listFiles()) {
if (temp.getName().equals("temp.jpg")) {
f = temp;
break;
}
}
try {
Bitmap bitmap;
BitmapFactory.Options bitmapOptions = new BitmapFactory.Options();
bitmap = BitmapFactory.decodeFile(f.getAbsolutePath(),
bitmapOptions);
viewImage.setImageBitmap(bitmap);
String path = android.os.Environment
.getExternalStorageDirectory()
+ File.separator
+ "Phoenix" + File.separator + "default";
f.delete();
OutputStream outFile = null;
File file = new File(path, String.valueOf(System.currentTimeMillis()) + ".jpg");
try {
outFile = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.JPEG, 85, outFile);
outFile.flush();
outFile.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
} else if (requestCode == 2) {
Uri selectedImage = data.getData();
String[] filePath = { MediaStore.Images.Media.DATA };
Cursor c = getContentResolver().query(selectedImage,filePath, null, null, null);
c.moveToFirst();
int columnIndex = c.getColumnIndex(filePath[0]);
String picturePath = c.getString(columnIndex);
c.close();
Bitmap thumbnail = (BitmapFactory.decodeFile(picturePath));
Log.w("path of image from gallery......******************.........", picturePath+"");
viewImage.setImageBitmap(thumbnail);
}
}
}
}
答案 1 :(得分：0)
我告诉你了......试试这个，
public class ShowWebView extends Activity {
//private Button button;
private WebView webView;
final Activity activity = this;
public Uri imageUri;
private static final int FILECHOOSER_RESULTCODE = 2888;
private ValueCallback<Uri> mUploadMessage;
private Uri mCapturedImageURI = null;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.show_web_view);
//Get webview
webView = (WebView) findViewById(R.id.webView1);
// Define url that will open in webview
String webViewUrl = "http://www.yourWebsite.com";
// Javascript inabled on webview
webView.getSettings().setJavaScriptEnabled(true);
// Other webview options
webView.getSettings().setLoadWithOverviewMode(true);
//webView.getSettings().setUseWideViewPort(true);
//Other webview settings
webView.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
webView.setScrollbarFadingEnabled(false);
webView.getSettings().setBuiltInZoomControls(true);
webView.getSettings().setPluginState(PluginState.ON);
webView.getSettings().setAllowFileAccess(true);
webView.getSettings().setSupportZoom(true);
//Load url in webview
webView.loadUrl(webViewUrl);
// Define Webview manage classes
startWebView();
}
private void startWebView() {
// Create new webview Client to show progress dialog
// Called When opening a url or click on link
// You can create external class extends with WebViewClient
// Taking WebViewClient as inner class
webView.setWebViewClient(new WebViewClient() {
ProgressDialog progressDialog;
//If you will not use this method url links are open in new brower not in webview
public boolean shouldOverrideUrlLoading(WebView view, String url) {
// Check if Url contains ExternalLinks string in url
// then open url in new browser
// else all webview links will open in webview browser
if(url.contains("google")){
// Could be cleverer and use a regex
//Open links in new browser
view.getContext().startActivity(
new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
// Here we can open new activity
return true;
} else {
// Stay within this webview and load url
view.loadUrl(url);
return true;
}
}
//Show loader on url load
public void onLoadResource (WebView view, String url) {
// if url contains string androidexample
// Then show progress Dialog
if (progressDialog == null && url.contains("androidexample")
) {
// in standard case YourActivity.this
progressDialog = new ProgressDialog(ShowWebView.this);
progressDialog.setMessage("Loading...");
progressDialog.show();
}
}
// Called when all page resources loaded
public void onPageFinished(WebView view, String url) {
try{
// Close progressDialog
if (progressDialog.isShowing()) {
progressDialog.dismiss();
progressDialog = null;
}
}catch(Exception exception){
exception.printStackTrace();
}
}
});
// You can create external class extends with WebChromeClient
// Taking WebViewClient as inner class
// we will define openFileChooser for select file from camera or sdcard
webView.setWebChromeClient(new WebChromeClient() {
// openFileChooser for Android 3.0+
public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType){
// Update message
mUploadMessage = uploadMsg;
try{
// Create AndroidExampleFolder at sdcard
File imageStorageDir = new File(
Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES)
, "AndroidExampleFolder");
if (!imageStorageDir.exists()) {
// Create AndroidExampleFolder at sdcard
imageStorageDir.mkdirs();
}
// Create camera captured image file path and name
File file = new File(
imageStorageDir + File.separator + "IMG_"
+ String.valueOf(System.currentTimeMillis())
+ ".jpg");
mCapturedImageURI = Uri.fromFile(file);
// Camera capture image intent
final Intent captureIntent = new Intent(
android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
captureIntent.putExtra(MediaStore.EXTRA_OUTPUT, mCapturedImageURI);
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("image/*");
// Create file chooser intent
Intent chooserIntent = Intent.createChooser(i, "Image Chooser");
// Set camera intent to file chooser
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS
, new Parcelable[] { captureIntent });
// On select image call onActivityResult method of activity
startActivityForResult(chooserIntent, FILECHOOSER_RESULTCODE);
}
catch(Exception e){
Toast.makeText(getBaseContext(), "Exception:"+e,
Toast.LENGTH_LONG).show();
}
}
// openFileChooser for Android < 3.0
public void openFileChooser(ValueCallback<Uri> uploadMsg){
openFileChooser(uploadMsg, "");
}
//openFileChooser for other Android versions
public void openFileChooser(ValueCallback<Uri> uploadMsg,
String acceptType,
String capture) {
openFileChooser(uploadMsg, acceptType);
}
// The webPage has 2 filechoosers and will send a
// console message informing what action to perform,
// taking a photo or updating the file
public boolean onConsoleMessage(ConsoleMessage cm) {
onConsoleMessage(cm.message(), cm.lineNumber(), cm.sourceId());
return true;
}
public void onConsoleMessage(String message, int lineNumber, String sourceID) {
//Log.d("androidruntime", "Show console messages, Used for debugging: " + message);
}
}); // End setWebChromeClient
}
// Return here when file selected from camera or from SDcard
@Override
protected void onActivityResult(int requestCode, int resultCode,
Intent intent) {
if(requestCode==FILECHOOSER_RESULTCODE)
{
if (null == this.mUploadMessage) {
return;
}
Uri result=null;
try{
if (resultCode != RESULT_OK) {
result = null;
} else {
// retrieve from the private variable if the intent is null
result = intent == null ? mCapturedImageURI : intent.getData();
}
}
catch(Exception e)
{
Toast.makeText(getApplicationContext(), "activity :"+e,
Toast.LENGTH_LONG).show();
}
mUploadMessage.onReceiveValue(result);
mUploadMessage = null;
}
}
// Open previous opened link from history on webview when back button pressed
@Override
// Detect when the back button is pressed
public void onBackPressed() {
if(webView.canGoBack()) {
webView.goBack();
} else {
// Let the system handle the back button
super.onBackPressed();
}
}
}
希望你的xml文件是这样的，
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<WebView
android:id="@+id/webView1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
</LinearLayout>
还会在清单中添加这些权限。
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />