Android学习之实现WebView中input="file"选择文件，处理选择图片无法返回类型问题

来源：互联网发布：xp限制安装软件编辑：程序博客网时间：2024/04/30 13:24
// js上传文件的<input type="file" name="fileField" id="fileField" />事件捕获    private ValueCallback<Uri> mUploadMessage;private final int FILECHOOSER_RESULTCODE = 1;// 需要自己重写WebChromeClient类，并实现里面的三个方法。如下：private class MyWebChromeClient extends WebChromeClient{    // Android < 3.0 调用这个方法     public void openFileChooser(ValueCallback<Uri> uploadMsg) {        this.openFileChooser(uploadMsg, "*/*");    }        // 3.0 + 调用这个方法     public void openFileChooser( ValueCallback<Uri> uploadMsg, String acceptType ) {        this.openFileChooser(uploadMsg, acceptType, null);    }        // Android > 4.1.1 调用这个方法     public void openFileChooser(final ValueCallback<Uri> uploadMsg, String acceptType, String capture)    {        mUploadMessage = uploadMsg; // 使用uploadMsg返回获取到的文件路径        Intent intent = new Intent(Intent.ACTION_GET_CONTENT);        intent.addCategory(Intent.CATEGORY_OPENABLE);        intent.setType("*/*");        startActivityForResult(intent, FILECHOOSER_RESULTCODE);    }}@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent intent) {    if (requestCode == FILECHOOSER_RESULTCODE) {         if (mUploadMessage == null)             return;         Uri result = intent == null || resultCode != RESULT_OK ? null : intent.getData();         try {mUploadMessage.onReceiveValue(Uri.fromFile(new File(getRealFilePath(context, result))));} catch (Exception e) {mUploadMessage = null; e.printStackTrace();}         mUploadMessage = null;     }}    /**     * 根据uri获取图片的真真实路径     * @param context     * @param uri     * @return     */    private String getRealFilePath(Context context, Uri uri ) {        if ( null == uri ) return null;        final String scheme = uri.getScheme();        String data = null;        if ( scheme == null )            data = uri.getPath();        else if ( ContentResolver.SCHEME_FILE.equals( scheme ) ) {            data = uri.getPath();        } else if ( ContentResolver.SCHEME_CONTENT.equals( scheme ) ) {            Cursor cursor = context.getContentResolver().query( uri, new String[] { ImageColumns.DATA }, null, null, null );            if ( null != cursor ) {                if ( cursor.moveToFirst() ) {                    int index = cursor.getColumnIndex( ImageColumns.DATA );                    if ( index > -1 ) {                        data = cursor.getString( index );                    }                }                cursor.close();            }        }        return data;    }
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