我要打开外部链接＆
target =“空白”
在新的可关闭窗口（如GMail应用程序）中的WebView应用程序中的链接。
我尝试执行与此处提到的相同的操作：
Android - Open target _blank links in WebView with external browser
＆
Handling External Links in android WebView like Gmail App does
但是它不起作用。
请帮助我在我的应用中实现此功能。
这是MainActivity.java文件：
package com.blogmaza;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.ConnectivityManager;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.os.Message;
import android.os.Parcelable;
import android.provider.MediaStore;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ProgressBar;
import android.widget.Toast;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import static com.blogmaza.R.id.webView;
public class MainActivity extends AppCompatActivity {
private WebView myWebView;
public SwipeRefreshLayout swipeLayout;
ProgressBar progressBar;
String OSVersion = android.os.Build.VERSION.RELEASE;
int reqCode=0;
public Uri imageUri;
public ValueCallback<Uri[]> uploadMessage;
public static final int REQUEST_SELECT_FILE = 100;
// private final static int FILECHOOSER_RESULTCODE = 1;
private static final int INPUT_FILE_REQUEST_CODE = 1;
private static final int FILECHOOSER_RESULTCODE = 1;
private static final String TAG = MainActivity.class.getSimpleName();
private ValueCallback<Uri> mUploadMessage;
private Uri mCapturedImageURI = null;
private ValueCallback<Uri[]> mFilePathCallback;
private String mCameraPhotoPath;
public static class DetectConnection {
public static boolean checkInternetConnection(Context context) {
ConnectivityManager con_manager = (ConnectivityManager)
context.getSystemService(Context.CONNECTIVITY_SERVICE);
return (con_manager.getActiveNetworkInfo() != null
&& con_manager.getActiveNetworkInfo().isAvailable()
&& con_manager.getActiveNetworkInfo().isConnected());
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
progressBar = (ProgressBar) findViewById(R.id.progressBar);
myWebView = (WebView)findViewById(webView);
WebSettings webSettings = myWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setCacheMode(WebSettings.LOAD_DEFAULT);
webSettings.setLoadWithOverviewMode(true);
webSettings.setJavaScriptCanOpenWindowsAutomatically(true);
webSettings.setAllowFileAccess(true);
webSettings.setAllowContentAccess(true);
myWebView.getSettings().setUserAgentString(String.format("Mozilla/5.0 (Linux; Android %s; BlogMaza v4 Build/IMM76B) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/72.0.3626.96 Mobile Safari/537.36", OSVersion));
if (!DetectConnection.checkInternetConnection(this)) {
Toast.makeText(getApplicationContext(), "No Internet!", Toast.LENGTH_SHORT).show();
} else {
myWebView.loadUrl("https://www.blogmaza.com");
}
myWebView.setWebViewClient(new webclient());
myWebView.setWebChromeClient(new PQChromeClient());
myWebView.getSettings().setSupportMultipleWindows(true);
myWebView.setWebChromeClient(new WebChromeClient() {
@Override
public boolean onCreateWindow(WebView view, boolean dialog, boolean userGesture, android.os.Message resultMsg)
{
WebView.HitTestResult result = view.getHitTestResult();
String data = result.getExtra();
Context context = view.getContext();
Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(data));
context.startActivity(browserIntent);
return false;
}
});
// Swipe to Refresh
final SwipeRefreshLayout swipeLayout = (SwipeRefreshLayout)this.findViewById(R.id.swipeToRefresh);
swipeLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
myWebView.reload(); // refreshes the WebView
if (null != swipeLayout) {
swipeLayout.setRefreshing(false);
}
}
});
}
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;
}
public class PQChromeClient extends WebChromeClient {
// For Android 5.0
public boolean onShowFileChooser(WebView view, ValueCallback<Uri[]> filePath, WebChromeClient.FileChooserParams fileChooserParams) {
// Double check that we don't have any existing callbacks
if (mFilePathCallback != null) {
mFilePathCallback.onReceiveValue(null);
}
mFilePathCallback = filePath;
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(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, INPUT_FILE_REQUEST_CODE);
return true;
}
public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) {
mUploadMessage = uploadMsg;
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);
}
// 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);
}
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
if (requestCode != INPUT_FILE_REQUEST_CODE || mFilePathCallback == null) {
super.onActivityResult(requestCode, resultCode, data);
return;
}
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;
} else if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.KITKAT) {
if (requestCode != FILECHOOSER_RESULTCODE || mUploadMessage == null) {
super.onActivityResult(requestCode, resultCode, data);
return;
}
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 = data == null ? mCapturedImageURI : data.getData();
}
} catch (Exception e) {
Toast.makeText(getApplicationContext(), "activity :" + e,
Toast.LENGTH_LONG).show();
}
mUploadMessage.onReceiveValue(result);
mUploadMessage = null;
}
}
return;
}
public class webclient extends WebViewClient {
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if(url.contains("play.google")){
view.getContext().startActivity(
new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
}
if(url.startsWith("whatsapp://")){
Uri uri=Uri.parse(url);
String msg = uri.getQueryParameter("text");
Intent sendIntent = new Intent();
sendIntent.setAction(Intent.ACTION_SEND);
sendIntent.putExtra(Intent.EXTRA_TEXT, msg);
sendIntent.setType("text/plain");
sendIntent.setPackage("com.whatsapp");
startActivity(sendIntent);
return true;
}
if (url.startsWith("tel:")) {
Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse(url));
startActivity(intent);
view.reload();
return true;
}
if ((url.contains("blogmaza.com"))) {
view.loadUrl(url);
return true;
} else {
view.getContext().startActivity(
new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
}
return true;
}
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
progressBar.setVisibility(View.VISIBLE);
}
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
progressBar.setVisibility(View.GONE);
}
}
private static final int TIME_DELAY = 2000;
private static long back_pressed;
@Override
public void onBackPressed() {
if(myWebView.canGoBack()) {
myWebView.goBack();
}
if (back_pressed + TIME_DELAY > System.currentTimeMillis()) {
super.onBackPressed();
} else {
Toast.makeText(getBaseContext(), "Press once again to exit!",
Toast.LENGTH_SHORT).show();
}
back_pressed = System.currentTimeMillis();
}
}
我还想从Google搜索应用程序和浏览器直接打开网站的链接。如此处所述：
How to force open URL in WebView? Set App as Default for WebView URL
哪个工作正常。唯一的问题是，所有页面都在应用程序中打开主页。
就像用户点击浏览器中的链接https://www.website.com/folder/page一样，
它会在应用中打开https://www.website.com/。
如何解决此问题？
这是AndroidManifest.xml文件：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.blogmaza">
<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">
<!-- Splash screen -->
<activity
android:name=".SplashScreen"
android:label="@string/app_name"
android:screenOrientation="portrait"
android:theme="@android:style/Theme.Black.NoTitleBar" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".MainActivity"
android:windowSoftInputMode="adjustResize|stateHidden"
android:configChanges="orientation|screenSize">
<intent-filter>
<data android:scheme="https" />
<data android:scheme="https" android:host="www.blogmaza.com"/>
<action android:name="android.intent.action.VIEW"/>
<category android:name="android.intent.category.BROWSABLE"/>
<category android:name="android.intent.category.DEFAULT"/>
</intent-filter>
</activity>
</application>
<uses-feature android:name="android.hardware.camera" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
</manifest>
这里是activity_main.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="com.blogmaza.MainActivity">
<android.support.v4.widget.SwipeRefreshLayout
android:id="@+id/swipeToRefresh"
android:layout_width="match_parent"
android:layout_height="match_parent">
<WebView
android:id="@+id/webView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:scrollbars="none">
</WebView>
</android.support.v4.widget.SwipeRefreshLayout>
<ProgressBar
android:id="@+id/progressBar"
style="?android:attr/progressBarStyle"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
注意：我在Android开发领域还很陌生。请发布解决方案并简要说明。
答案 0 :(得分：5)
我提供了一个简化的示例，说明了如何通过2个活动来完成此任务，一个活动处理您的初始URL加载和链接点击的拦截，另一个活动将另一个视图内的拦截URL加载。首先，您需要在您的Web视图上实现shouldOverrideUrlLoading并为其返回true。然后，在shouldOverrideUrlLoading内部，您需要捕获单击的链接，并将捆绑包中的URL传递给您想要看起来像GMAIl布局的新视图。在该视图内，您可以创建一个按钮，该按钮将使用户返回上一个视图。
wv.setWebViewClient(new WebViewClient() {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
System.out.println("URLOFCLICK"+url);
Intent intents=new Intent(cn,WebviewOpenerLikeGMAIL.class);
intents.putExtra("URL", url);
startActivity(intents);
return true;
}
});
在您的GMAIL视图中相似
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.gmaillike);
mWebView = findViewById(R.id.myGMAILwebview);
Button closeVIEW = findViewById(R.id.button);
closeVIEW.setOnClickListener(this);
String value = getIntent().getExtras().getString("URL");
mWebView.loadUrl(value);
mWebView.getSettings().setJavaScriptEnabled(true);
mWebView.getSettings().setUseWideViewPort(true);
mWebView.getSettings().setLoadWithOverviewMode(true);
}
@Override
public void onClick(View v) {
onBackPressed();
}
@Override
public void onBackPressed() {
//this is only needed if you have specific things
//that you want to do when the user presses the back button.
/* your specific things...*/
super.onBackPressed();
}