WebView Android Studio 中的文件上传 [英] File Upload in WebView Android Studio
本文介绍了WebView Android Studio 中的文件上传的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想允许来自我的 WebView Android 应用程序的上传按钮.由于我不是 Android 开发人员，因此我需要您的帮助来为 Android WebView 启用图像上传器.这是我的 MainActivity 文件.
I want to allow an upload button from my WebView Android Application. Since I'm not an android developer, I need your help to enable image uploader for Android WebView. This is my MainActivity file.
package com.hfzgk.hfzgk;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class MainActivity extends AppCompatActivity {
WebView myWeb;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setPage();
}
private void setPage(){
myWeb = (WebView) findViewById(R.id.myViewId);
WebSettings myseeting = myWeb.getSettings();
myseeting.setJavaScriptEnabled(true);
myWeb.loadUrl("http://www.hfzgk.tk/");
myWeb.setWebViewClient(new WebViewClient());
}
@Override
public void onBackPressed() {
if (myWeb.canGoBack())
myWeb.goBack();
else
super.onBackPressed();
}
}
推荐答案
试试这个作为你的 mainactivity.java:
try this as your mainactivity.java:
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 java.io.*;
import android.util.*;
import java.text.*;
import android.annotation.*;
import java.util.*;
import android.app.*;
import android.provider.*;
import android.os.*;
import android.webkit.*;
public class MainActivity extends Activity {
public static final int REQUEST_CODE_LOLIPOP = 1;
private final static int RESULT_CODE_ICE_CREAM = 2;
private WebView webView;
private ValueCallback<Uri[]> mFilePathCallback;
private String mCameraPhotoPath;
private ValueCallback<Uri> mUploadMessage;
private String url ="http://up.example.com";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
webView = (WebView) findViewById(R.id.wbvw);
setUpWebViewDefaults(webView);
webView.loadUrl(url);
webView.setWebChromeClient(new WebChromeClient() {
private String TAG;
// 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"),
RESULT_CODE_ICE_CREAM);
}
// 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"),
RESULT_CODE_ICE_CREAM);
}
//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"),
RESULT_CODE_ICE_CREAM);
}
//For Android5.0+
public boolean onShowFileChooser(
WebView webView, ValueCallback<Uri[]> filePathCallback,
FileChooserParams fileChooserParams) {
if (mFilePathCallback != null) {
mFilePathCallback.onReceiveValue(null);
}
mFilePathCallback = filePathCallback;
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(MainActivity.this.getPackageManager()) != null) {
// Create the File where the photo should go
File photoFile = null;
try {
photoFile = createImageFile();
takePictureIntent.putExtra("PhotoPath", mCameraPhotoPath);
} catch (IOException ex) {
// Error occurred while creating the File
Log.e(TAG, "Unable to create Image File", ex);
}
// Continue only if the File was successfully created
if (photoFile != null) {
mCameraPhotoPath = "file:" + photoFile.getAbsolutePath();
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,
Uri.fromFile(photoFile));
} else {
takePictureIntent = null;
}
}
Intent contentSelectionIntent = new Intent(Intent.ACTION_GET_CONTENT);
contentSelectionIntent.addCategory(Intent.CATEGORY_OPENABLE);
contentSelectionIntent.setType("image/*");
Intent[] intentArray;
if (takePictureIntent != null) {
intentArray = new Intent[]{takePictureIntent};
} else {
intentArray = new Intent[0];
}
Intent chooserIntent = new Intent(Intent.ACTION_CHOOSER);
chooserIntent.putExtra(Intent.EXTRA_INTENT, contentSelectionIntent);
chooserIntent.putExtra(Intent.EXTRA_TITLE, "Image Chooser");
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, intentArray);
startActivityForResult(chooserIntent, REQUEST_CODE_LOLIPOP);
return true;
}
});
}
private File createImageFile() throws IOException {
// Create an image file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
File storageDir = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES);
File imageFile = File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
storageDir /* directory */
);
return imageFile;
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
private void setUpWebViewDefaults(WebView webView) {
WebSettings settings = webView.getSettings();
// Enable Javascript
settings.setJavaScriptEnabled(true);
// Use WideViewport and Zoom out if there is no viewport defined
settings.setUseWideViewPort(true);
settings.setLoadWithOverviewMode(true);
// Enable pinch to zoom without the zoom buttons
settings.setBuiltInZoomControls(true);
if (Build.VERSION.SDK_INT > Build.VERSION_CODES.HONEYCOMB) {
// Hide the zoom controls for HONEYCOMB+
settings.setDisplayZoomControls(false);
}
// Enable remote debugging via chrome://inspect
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
WebView.setWebContentsDebuggingEnabled(true);
}
// We set the WebViewClient to ensure links are consumed by the WebView rather
// than passed to a browser if it can
webView.setWebViewClient(new WebViewClient());
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case RESULT_CODE_ICE_CREAM:
Uri uri = null;
if (data != null) {
uri = data.getData();
}
mUploadMessage.onReceiveValue(uri);
mUploadMessage = null;
break;
case REQUEST_CODE_LOLIPOP:
Uri[] results = null;
// Check that the response is a good one
if (resultCode == Activity.RESULT_OK) {
if (data == null) {
// If there is not data, then we may have taken a photo
if (mCameraPhotoPath != null) {
results = new Uri[]{Uri.parse(mCameraPhotoPath)};
}
} else {
String dataString = data.getDataString();
if (dataString != null) {
results = new Uri[]{Uri.parse(dataString)};
}
}
}
mFilePathCallback.onReceiveValue(results);
mFilePathCallback = null;
break;
}
}
}
也在你的activitymain.xml中添加:
also add this in your activitymain.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<WebView
android:id="@+id/webview"
android:layout_width="match_parent"
android:layout_height="match_parent">
</WebView>
</RelativeLayout>
最后不要忘记在您的 manifest.xml 中授予权限:
and finally don't forget to give permission in your manifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.aashiq.multipleimg">
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
这篇关于WebView Android Studio 中的文件上传的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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