在Web視圖中選擇文件視圖不打開

Question

我使用WebView在Android應用程序中打開我的網站，一切正常，但是當我點擊選擇文件按鈕上傳圖像時，該按鈕不可點擊。在我的網站上有一個上傳圖片的選項，用戶需要上傳圖片，但選擇文件按鈕不會在應用程序內部點擊。

package com.example.roomsarehere.roomsarehere; 

import android.app.ProgressDialog; 
import android.content.Intent; 
import android.graphics.Bitmap; 
import android.net.Uri; 
import android.os.Bundle; 
import android.support.design.widget.FloatingActionButton; 
import android.support.design.widget.Snackbar; 
import android.view.KeyEvent; 
import android.view.View; 
import android.support.design.widget.NavigationView; 
import android.support.v4.view.GravityCompat; 
import android.support.v4.widget.DrawerLayout; 
import android.support.v7.app.ActionBarDrawerToggle; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.webkit.WebSettings; 
import android.webkit.WebView; 
import android.webkit.WebViewClient; 

import java.net.URI; 

public class MainActivity extends AppCompatActivity 
    implements NavigationView.OnNavigationItemSelectedListener { 





//initializing WebView 
private WebView mwebView; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 


    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
    fab.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG) 
        .setAction("Action", null).show(); 
     } 
    }); 

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
      this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close); 
    drawer.setDrawerListener(toggle); 
    toggle.syncState(); 

    NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view); 
    navigationView.setNavigationItemSelectedListener(this); 

    //WebView 
    mwebView = (WebView) findViewById(R.id.myWebView); 
    WebSettings webSettings = mwebView.getSettings(); 
    webSettings.setJavaScriptEnabled(true); 
    //improve webView performance 
    mwebView.getSettings().setRenderPriority(WebSettings.RenderPriority.HIGH); 
    mwebView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK); 
    mwebView.getSettings().setAppCacheEnabled(true); 
    mwebView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY); 
    webSettings.setDomStorageEnabled(true); 
    webSettings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.NARROW_COLUMNS); 
    webSettings.setUseWideViewPort(true); 
    webSettings.setSavePassword(true); 
    webSettings.setSaveFormData(true); 
    webSettings.setEnableSmoothTransition(true); 


    mwebView.loadUrl("http://www.roomsarehere.com"); 
    //force links open in webview only 
    mwebView.setWebViewClient(new MyWebviewClient()); 

} 


@Override 
public void onBackPressed() { 
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
    if (drawer.isDrawerOpen(GravityCompat.START)) { 
     drawer.closeDrawer(GravityCompat.START); 
    } else { 
     super.onBackPressed(); 
    } 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.main, menu); 
    return true; 
} 

@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); 
} 

@SuppressWarnings("StatementWithEmptyBody") 
@Override 
public boolean onNavigationItemSelected(MenuItem item) { 
    // Handle navigation view item clicks here. 
    int id = item.getItemId(); 

    if (id == R.id.nav_camera) { 
     // Handle the camera action 
     mwebView.loadUrl("http://www.newsweek.com/us"); 
    } else if (id == R.id.nav_gallery) { 
     mwebView.loadUrl("http://www.newsweek.com/world"); 
    } else if (id == R.id.nav_manage) { 
     mwebView.loadUrl("http://www.newsweek.com/tech-science"); 
    } else if (id == R.id.nav_slideshow) { 
     mwebView.loadUrl("http://www.newsweek.com/sports"); 
    } else if (id == R.id.nav_share) { 
     mwebView.loadUrl("http://www.newsweek.com/about-newsweek"); 
    } else if (id == R.id.nav_send) { 
     mwebView.loadUrl("http://www.newsweek.com/contact"); 
    } 

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
    drawer.closeDrawer(GravityCompat.START); 
    return true; 
} 

private class MyWebviewClient extends WebViewClient { 
    @Override 
    public boolean shouldOverrideUrlLoading(WebView view, String url) { 
     if (Uri.parse(url).getHost().equals("www.roomsarehere.com")) { 
      //open url contents in webview 
      return false; 
     } else { 
      //here open external links in external browser or app 
      Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url)); 
      startActivity(intent); 
      return true; 
     } 

    } 
    //ProgressDialogue 
    ProgressDialog pd = null; 

    @Override 
    public void onPageStarted(WebView view, String url, Bitmap favicon) { 
     pd=new ProgressDialog(MainActivity.this); 
     pd.setTitle("Please Wait.."); 
     pd.setMessage("Content is Loading.."); 
     pd.show(); 
     super.onPageStarted(view, url, favicon); 
    } 

    @Override 
    public void onPageFinished(WebView view, String url) { 
     pd.dismiss(); 
     super.onPageFinished(view, url); 
    } 
} 
//goto previous page when pressing back button 

@Override 
public boolean onKeyDown(int keyCode, KeyEvent event) { 
    if (event.getAction() == KeyEvent.ACTION_DOWN) { 
     switch (keyCode) { 
      case KeyEvent.KEYCODE_BACK: 
       if (mwebView.canGoBack()) { 
        mwebView.goBack(); 
       } else { 
        finish(); 
       } 
       return true; 
     } 
    } 
    return super.onKeyDown(keyCode, event); 
} 
} 

Answer 1

使用此代碼。

聲明這些變量全球

private ValueCallback<Uri[]> afterLolipop; 
private ValueCallback<Uri> mUploadMessage; 

然後加入WebChromeClient聽者加時賽您WebView：

 webView.setWebChromeClient(new WebChromeClient() { 

     // For Android 3.0+ - undocumented method 
     public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) { 

       Intent i = new Intent(Intent.ACTION_GET_CONTENT); 
       i.addCategory(Intent.CATEGORY_OPENABLE); 
       i.setType("image/*"); 
       startActivityForResult(Intent.createChooser(i, "File Chooser"), 101); 
       Log.i("DEBUG", "Open file Chooser"); 
       mUploadMessage = uploadMsg; 
      } 

     // For Android > 4.1 - undocumented method 
     @SuppressWarnings("unused") 
     public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) { 
      openFileChooser(uploadMsg, ""); 

     } 

     // For Android > 5.0 
     @TargetApi(Build.VERSION_CODES.LOLLIPOP) 
     public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, WebChromeClient.FileChooserParams fileChooserParams) { 

       startActivityForResult(fileChooserParams.createIntent(), 101); 


     } 

    }); 

在onActivityResult()

@Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) { 
     switch (requestCode) { 
      case 101: 
       if (resultCode == RESULT_OK) { 

        Uri result = intent == null || resultCode != RESULT_OK ? null 
          : intent.getData(); 
        if (mUploadMessage != null) { 
         mUploadMessage.onReceiveValue(result); 
        } else if (afterLolipop != null) { 

         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { 
          afterLolipop.onReceiveValue(WebChromeClient.FileChooserParams.parseResult(resultCode, intent)); 
          afterLolipop = null; 
         } 
        } 
        mUploadMessage = null; 
       } 
     } 

    } 

希望它會運行