<manifest ...>
  <uses-permission android:name="android.permission.INTERNET" />
  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
  <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
  <application
      ...
  </application>
</manifest>

<WebView
    android:id="@+id/local_webview"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:visibility="gone" />

private WebView webview;
//...
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
    WebView.setWebContentsDebuggingEnabled(true);
  }

  webview = findViewById(R.id.local_webview);

  WebSettings settings = webview.getSettings();

  loading = findViewById(R.id.loadView);

  settings.setJavaScriptEnabled(true);//必須

  settings.setCacheMode(WebSettings.LOAD_DEFAULT);//關(guān)閉webview中緩存
  settings.setRenderPriority(WebSettings.RenderPriority.HIGH);//提高渲染的優(yōu)先級(jí)
  settings.setUseWideViewPort(true);//WebView是否支持HTML的“viewport”標(biāo)簽或者使用wide viewport。
  settings.setAllowContentAccess(true);//是否允許在WebView中訪問內(nèi)容URL
  settings.setBuiltInZoomControls(true);//是否使用其內(nèi)置的變焦機(jī)制
  settings.setJavaScriptCanOpenWindowsAutomatically(true);//是否允許自動(dòng)打開彈窗
  settings.setDomStorageEnabled(true);//是否開啟DOM存儲(chǔ)API權(quán)限

  webview.loadUrl("http://www.baidu.com");

  webview.setWebChromeClient(new WebChromeClient() {
    @Override
    public void onProgressChanged(WebView view, int newProgress) {
      Log.d("加載", "on page progress changed and progress is " + newProgress);
      //...
    }

  }
  
  webview.setWebViewClient(new WebViewClient() {
    @Override
    public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
      super.onReceivedError(view, errorCode, description, failingUrl);
          // 加載網(wǎng)頁失敗時(shí)處理 如：
      view.loadDataWithBaseURL(null,
        "<span>頁面加載失敗,請確認(rèn)網(wǎng)絡(luò)是否連接</span>",
        "text/html",
        "utf-8",
        null);
    }

    @Override
    public void onPageFinished(WebView view, String url) {
      if (!webview.getSettings().getLoadsImagesAutomatically()) {
        webview.getSettings().setLoadsImagesAutomatically(true);
      }
      Log.d("加載", "end ");
    }

  });
}

maven {
 url "https://jitpack.io"
}

<android.support.constraint.ConstraintLayout >

  <com.mingle.widget.LoadingView
    android:id="@+id/loadView"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" />

  ...

</android.support.constraint.ConstraintLayout>

public static final int INPUT_FILE_REQUEST_CODE = 1;
  private ValueCallback<Uri> mUploadMessage;
  private final static int FILECHOOSER_RESULTCODE = 2;
  private ValueCallback<Uri[]> mFilePathCallback;
  private String mCameraPhotoPath;

public void openFileChooser(ValueCallback uploadMsg, String acceptType) {
        Log.d("選擇", "3.0+");
        mUploadMessage = uploadMsg;
        Intent i = new Intent(Intent.ACTION_GET_CONTENT);
        i.addCategory(Intent.CATEGORY_OPENABLE);
        i.setType("image/*");
        MainActivity.this.startActivityForResult(
            Intent.createChooser(i, "Image Chooser"),
            FILECHOOSER_RESULTCODE);
      }


      //Android 5.0
      public boolean onShowFileChooser(
          WebView webView, ValueCallback<Uri[]> filePathCallback,
          WebChromeClient.FileChooserParams fileChooserParams) {
        Log.d("選擇", "5.0+");
        if (mFilePathCallback != null) {
          mFilePathCallback.onReceiveValue(null);
        }


        mFilePathCallback = filePathCallback;


        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 {
            //設(shè)置MediaStore.EXTRA_OUTPUT路徑,相機(jī)拍照寫入的全路徑
            photoFile = createImageFile();
            takePictureIntent.putExtra("PhotoPath", mCameraPhotoPath);
          } catch (Exception ex) {
            // Error occurred while creating the File
            Log.e("WebViewSetting", "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));
            System.out.println(mCameraPhotoPath);
          } 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};
          System.out.println(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;
      }
      // For Android 3.0+
      public void openFileChooser(ValueCallback<Uri> uploadMsg) {
        Log.d("選擇", "3.0+");

        mUploadMessage = uploadMsg;
        Intent i = new Intent(Intent.ACTION_GET_CONTENT);
        i.addCategory(Intent.CATEGORY_OPENABLE);
        i.setType("image/*");
        MainActivity.this.startActivityForResult(Intent.createChooser(i, "Image Chooser"), FILECHOOSER_RESULTCODE);

      }

      //For Android 4.1
      public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
        Log.d("選擇", "4+");
        mUploadMessage = uploadMsg;
        Intent i = new Intent(Intent.ACTION_GET_CONTENT);
        i.addCategory(Intent.CATEGORY_OPENABLE);
        i.setType("image/*");
        MainActivity.this.startActivityForResult(Intent.createChooser(i, "Image Chooser"), MainActivity.FILECHOOSER_RESULTCODE);

      }

@SuppressLint("SdCardPath")
  private File createImageFile() {
    File file=new File(Environment.getExternalStorageDirectory()+"/","tmp.png");
    mCameraPhotoPath=file.getAbsolutePath();
    if(!file.exists())
    {
      try {
        file.createNewFile();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
    return file;
  }
   @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
      Log.d("result", "show");
      if (requestCode == FILECHOOSER_RESULTCODE) {
        if (null == mUploadMessage) return;
        Uri result = data == null || resultCode != RESULT_OK ? null
            : data.getData();
        if (result != null) {
          String imagePath = ImageFilePath.getPath(this, result);
          if (!TextUtils.isEmpty(imagePath)) {
            result = Uri.parse("file:///" + imagePath);
          }
        }
        mUploadMessage.onReceiveValue(result);
        mUploadMessage = null;
      } else if (requestCode == INPUT_FILE_REQUEST_CODE && mFilePathCallback != null) {
        // 5.0的回調(diào)
        Uri[] results = null;
  
        // Check that the response is a good one
        if (resultCode == Activity.RESULT_OK) {
          if (data == null && !TextUtils.isEmpty(data.getDataString())) {
            // 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 {
        super.onActivityResult(requestCode, resultCode, data);
        return;
      }
    }