Android WebView 上傳圖片問題

Android WebView 上傳圖片問題

因爲Android WebView 中上傳圖片，需要調起手機相冊，同時還需要處理相冊回調問題！
要處理上傳圖片問題，要重寫WebView 的 WebChromeClient
代碼如下

webView.setWebChromeClient(new WebChromeClient() {
    @Override
    public void onProgressChanged(WebView view, int newProgress) {
        if (newProgress == 100) {
            //加載完網頁進度條消失
            if (customProgressDialog != null) {
                customProgressDialog.dismiss();
            }
        }
        super.onProgressChanged(view, newProgress);
    }
    // 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;
    }
});

private void openImageChooserActivity() {
    // 調用自己的圖庫
    Intent i = new Intent(Intent.ACTION_GET_CONTENT);
    i.addCategory(Intent.CATEGORY_OPENABLE);
    i.setType("image/*");
            startActivityForResult(Intent.createChooser(i, "Image Chooser"), REQUEST_SELECT_FILE);
}

處理回調問題

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == REQUEST_SELECT_FILE) { //處理返回的圖片，並進行上傳
        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 != REQUEST_SELECT_FILE || 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;
}

@Override
protected void onResume() {
    super.onResume();
    if (uploadMessage != null) {
        //取消之後要告訴WebView不要再等待返回結果，設置爲空就等於重置了狀態,也是避免只能選擇一次圖片的原因
        uploadMessage.onReceiveValue(null);
        uploadMessage = null;
    }

    if (uploadMessageAboveL != null) {
        //取消之後要告訴WebView不要再等待返回結果，設置爲空就等於重置了狀態,也是避免只能選擇一次圖片的原因
        uploadMessageAboveL.onReceiveValue(null);
        uploadMessageAboveL = null;
    }
}