我将 WebView 用于一个简单的应用程序，让用户在网站上上传图片。当前，当用户单击我网站上表单的“选择文件”部分时，我会弹出一个“图像选择器”。
我宁愿要求用户选择一个动作（相机、画廊、文件管理器）。当用户使用浏览器而不是在 WebView 中时，这种情况已经发生。我该怎么做？
我现有的代码如下：
package com.example.test;
import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.View;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
public class MainActivity extends Activity {
private WebView mWebView;
private ValueCallback<Uri> mUploadMessage;
private final static int FILECHOOSER_RESULTCODE = 1;
@Override
protected void onActivityResult(int requestCode, int resultCode,
Intent intent) {
if (requestCode == FILECHOOSER_RESULTCODE) {
if (null == mUploadMessage)
return;
Uri result = intent == null || resultCode != RESULT_OK ? null
: intent.getData();
mUploadMessage.onReceiveValue(result);
mUploadMessage = null;
}
}
protected class MyWebChromeClient extends WebChromeClient {
public void openFileChooser(ValueCallback<Uri> uploadMsg) {
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);
}
public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) {
openFileChooser(uploadMsg);
}
public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
openFileChooser(uploadMsg);
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mWebView = (WebView) findViewById(R.id.webview);
mWebView.getSettings().setJavaScriptEnabled(true);
mWebView.loadUrl("http://test.com");
mWebView.setWebViewClient(new HelloWebViewClient());
mWebView.setWebChromeClient(new MyWebChromeClient());
Button newButton = (Button)findViewById(R.id.button1);
newButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
MainActivity.this.mWebView.loadUrl("http://test.com");
}});
}
private class HelloWebViewClient extends WebViewClient {
@Override
public boolean shouldOverrideUrlLoading(WebView webview, String url){
webview.loadUrl(url);
return true;
}
}
@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 onKeyDown(int keyCode, KeyEvent event)
{
if ((keyCode == KeyEvent.KEYCODE_BACK)&& mWebView.canGoBack()){
mWebView.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
}