Android WebView 上传图片注意事项和完整代码参考

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重点说明

机型4.4.0 可能不支持
Webview上传文件的那些坑

混淆说明：正式版不混淆openFileChooser()就好了。
参考资料

-keepclassmembers class * extends android.webkit.WebChromeClient{       public void openFileChooser(...);}

在Web页面上点击选择文件的控件()时，会回调WebChromeClient下的openFileChooser()（5.0及以上系统回调onShowFileChooser()）。这个时候我们在openFileChooser方法中通过Intent打开系统相册或者支持该Intent的第三方应用来选择图片

最求完美的Google攻城狮们对openFileChooser做了多次修改，在5.0上更是将回调方法该为了onShowFileChooser。所以为了解决这一问题，兼容各个版本，我们需要对openFileChooser()进行重载，同时针对5.0及以上系统提供onShowFileChooser()方法：

完整代码

import android.annotation.TargetApi;import android.app.Activity;import android.content.ClipData;import android.content.Intent;import android.net.Uri;import android.os.Build;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.webkit.ValueCallback;import android.webkit.WebChromeClient;import android.webkit.WebSettings;import android.webkit.WebView;    public class MainActivity extends AppCompatActivity {        private ValueCallback<Uri> uploadMessage;        private ValueCallback<Uri[]> uploadMessageAboveL;        private final static int FILE_CHOOSER_RESULT_CODE = 10000;        @Override        protected void onCreate(Bundle savedInstanceState) {            super.onCreate(savedInstanceState);            setContentView(R.layout.activity_main);            WebView webview = (WebView) findViewById(R.id.web_view);            assert webview != null;            WebSettings settings = webview.getSettings();            settings.setUseWideViewPort(true);            settings.setLoadWithOverviewMode(true);            settings.setJavaScriptEnabled(true);            webview.setWebChromeClient(new WebChromeClient() {                // For Android < 3.0                public void openFileChooser(ValueCallback<Uri> valueCallback) {                    uploadMessage = valueCallback;                    openImageChooserActivity();                }                // For Android  >= 3.0                public void openFileChooser(ValueCallback valueCallback, String acceptType) {                    uploadMessage = valueCallback;                    openImageChooserActivity();                }                //For Android  >= 4.1                public void openFileChooser(ValueCallback<Uri> valueCallback, String acceptType, String capture) {                    uploadMessage = valueCallback;                    openImageChooserActivity();                }                // For Android >= 5.0                @Override                public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, WebChromeClient.FileChooserParams fileChooserParams) {                    uploadMessageAboveL = filePathCallback;                    openImageChooserActivity();                    return true;                }            });            //改成自己的url            String targetUrl = "file:///android_asset/up.html";            webview.loadUrl(targetUrl);        }        private void openImageChooserActivity() {            Intent i = new Intent(Intent.ACTION_GET_CONTENT);            i.addCategory(Intent.CATEGORY_OPENABLE);            i.setType("image/*");            startActivityForResult(Intent.createChooser(i, "Image Chooser"), FILE_CHOOSER_RESULT_CODE);        }        @Override        protected void onActivityResult(int requestCode, int resultCode, Intent data) {            super.onActivityResult(requestCode, resultCode, data);            if (requestCode == FILE_CHOOSER_RESULT_CODE) {                if (null == uploadMessage && null == uploadMessageAboveL) return;                Uri result = data == null || resultCode != RESULT_OK ? null : data.getData();                if (uploadMessageAboveL != null) {                    onActivityResultAboveL(requestCode, resultCode, data);                } else if (uploadMessage != null) {                    uploadMessage.onReceiveValue(result);                    uploadMessage = null;                }            }        }        @TargetApi(Build.VERSION_CODES.LOLLIPOP)        private void onActivityResultAboveL(int requestCode, int resultCode, Intent intent) {            if (requestCode != FILE_CHOOSER_RESULT_CODE || uploadMessageAboveL == null)                return;            Uri[] results = null;            if (resultCode == Activity.RESULT_OK) {                if (intent != null) {                    String dataString = intent.getDataString();                    ClipData clipData = intent.getClipData();                    if (clipData != null) {                        results = new Uri[clipData.getItemCount()];                        for (int i = 0; i < clipData.getItemCount(); i++) {                            ClipData.Item item = clipData.getItemAt(i);                            results[i] = item.getUri();                        }                    }                    if (dataString != null)                        results = new Uri[]{Uri.parse(dataString)};                }            }            uploadMessageAboveL.onReceiveValue(results);            uploadMessageAboveL = null;        }    }

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