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   源码介绍

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package com.trend21c.sampleupload;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;

public class MainActivity extends ActionBarActivity {

    private ValueCallback<Uri> filePathCallbackNormal;
    private ValueCallback<Uri[]> filePathCallbackLollipop;
    private final static int FILECHOOSER_NORMAL_REQ_CODE = 1;
    private final static int FILECHOOSER_LOLLIPOP_REQ_CODE = 2;

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

        WebView wv = (WebView) findViewById(R.id.webview);
        wv.setWebChromeClient(new WebChromeClient() {
            // For Android < 3.0
            public void openFileChooser( ValueCallback<Uri> uploadMsg) {
                Log.d("MainActivity", "3.0 <");
                openFileChooser(uploadMsg, "");
            }
            // For Android 3.0 
            public void openFileChooser( ValueCallback<Uri> uploadMsg, String acceptType) {
                Log.d("MainActivity", "3.0 ");
                filePathCallbackNormal = uploadMsg;
                Intent i = new Intent(Intent.ACTION_GET_CONTENT);
                i.addCategory(Intent.CATEGORY_OPENABLE);
                i.setType("image/*");
                startActivityForResult(Intent.createChooser(i, "File Chooser"), FILECHOOSER_NORMAL_REQ_CODE);
            }
            // For Android 4.1 
            public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
                Log.d("MainActivity", "4.1 ");
                openFileChooser(uploadMsg, acceptType);
            }

            // For Android 5.0 
            public boolean onShowFileChooser(
                    WebView webView, ValueCallback<Uri[]> filePathCallback,
                    WebChromeClient.FileChooserParams fileChooserParams) {
                Log.d("MainActivity", "5.0 ");
                if (filePathCallbackLollipop != null) {
                    filePathCallbackLollipop.onReceiveValue(null);
                    filePathCallbackLollipop = null;
                }
                filePathCallbackLollipop = filePathCallback;
                Intent i = new Intent(Intent.ACTION_GET_CONTENT);
                i.addCategory(Intent.CATEGORY_OPENABLE);
                i.setType("image/*");
                startActivityForResult(Intent.createChooser(i, "File Chooser"), FILECHOOSER_LOLLIPOP_REQ_CODE);

                return true;
            }
        });
        WebSettings set = wv.getSettings();
        set.setJavaScriptEnabled(true);
        wv.loadUrl("http://test.com/upload.php");
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == FILECHOOSER_NORMAL_REQ_CODE) {
            if (filePathCallbackNormal == null) return ;
            Uri result = (data == null || resultCode != RESULT_OK) ? null : data.getData();
            filePathCallbackNormal.onReceiveValue(result);
            filePathCallbackNormal = null;
        } else if (requestCode == FILECHOOSER_LOLLIPOP_REQ_CODE) {
            if (filePathCallbackLollipop == null) return ;
            filePathCallbackLollipop.onReceiveValue(WebChromeClient.FileChooserParams.parseResult(resultCode, data));
            filePathCallbackLollipop = null;
        }
    }

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

}