Androoid WebView加載html調用手機拍照和相冊

最近兩篇都是關於WebView的，以前就覺得WebView很坑，存在各種問題，所以特別討厭使用WebView，但是最近因爲公司項目需求，不得不使用了。今天說的是WebView加載的網頁中點擊按鈕可以調用手機相冊和拍照的功能。因爲WebView本身是沒有這個權限的，所以需要你重寫其中的方法，下面是代碼：

public class MainActivity extends AppCompatActivity {
    private WebView mWebView;
    private String path="http://123.56.64.244:8082/hgjl.admin/timeline/time.html?customerid=166";
    private ValueCallback<Uri> mUploadMessage;// 表單的數據信息
    private ValueCallback<Uri[]> mUploadCallbackAboveL;
    private final static int FILECHOOSER_RESULTCODE = 1;// 表單的結果回調</span>
    private Uri imageUri;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mWebView = (WebView) findViewById(R.id.web);
        mWebView.loadUrl(path);
        mWebView.getSettings().setJavaScriptEnabled(true);
        mWebView.getSettings().setRenderPriority(WebSettings.RenderPriority.HIGH);
        WebSettings settings = mWebView.getSettings();
        settings.setUseWideViewPort(true);
        settings.setLoadWithOverviewMode(true);
        settings.setJavaScriptEnabled(true);
        settings.setSupportZoom(true);
        mWebView.setWebViewClient(new WebViewClient() {
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                // TODO Auto-generated method stub
                return super.shouldOverrideUrlLoading(view, url);
            }

            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon) {
                // TODO Auto-generated method stub
                super.onPageStarted(view, url, favicon);
            }

            @Override
            public void onPageFinished(WebView view, String url) {
                // TODO Auto-generated method stub
                super.onPageFinished(view, url);
            }
        });
        mWebView.setWebChromeClient(new WebChromeClient() {
            @Override
            public boolean onShowFileChooser(WebView webView,
                                             ValueCallback<Uri[]> filePathCallback,
                                             FileChooserParams fileChooserParams) {
                mUploadCallbackAboveL = filePathCallback;
                takePhoto();
                return true;
            }

            public void openFileChooser(ValueCallback<Uri> uploadMsg) {
                mUploadMessage = uploadMsg;
                takePhoto();
            }

            public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) {
                mUploadMessage = uploadMsg;
                takePhoto();
            }

            public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
                mUploadMessage = uploadMsg;
                takePhoto();
            }
        });

    }


    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == FILECHOOSER_RESULTCODE) {
            if (null == mUploadMessage && null == mUploadCallbackAboveL) return;
            Uri result = data == null || resultCode != RESULT_OK ? null : data.getData();
            if (mUploadCallbackAboveL != null) {
                onActivityResultAboveL(requestCode, resultCode, data);
            } else if (mUploadMessage != null) {
                Log.e("Mr.Kang", "onActivityResult: "+result);
                if (result == null) {
                    mUploadMessage.onReceiveValue(imageUri);
                    mUploadMessage = null;

                    Log.e("Mr.Kang", "onActivityResult: "+imageUri);
                } else {
                    mUploadMessage.onReceiveValue(result);
                    mUploadMessage = null;
                }


            }
        }
    }


    @SuppressWarnings("null")
    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    private void onActivityResultAboveL(int requestCode, int resultCode, Intent data) {
        if (requestCode != FILECHOOSER_RESULTCODE
                || mUploadCallbackAboveL == null) {
            return;
        }

        Uri[] results = null;
        if (resultCode == Activity.RESULT_OK) {
            if (data == null) {
                results = new Uri[]{imageUri};
            } else {
                String dataString = data.getDataString();
                ClipData clipData = data.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)};
            }
        }
        if (results != null) {
            mUploadCallbackAboveL.onReceiveValue(results);
            mUploadCallbackAboveL = null;
        } else {
            results = new Uri[]{imageUri};
            mUploadCallbackAboveL.onReceiveValue(results);
            mUploadCallbackAboveL = null;
        }

        return;
    }


    private void takePhoto() {
        File imageStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "MyApp");
        // Create the storage directory if it does not exist
        if (!imageStorageDir.exists()) {
            imageStorageDir.mkdirs();
        }
        File file = new File(imageStorageDir + File.separator + "IMG_" + String.valueOf(System.currentTimeMillis()) + ".jpg");
        imageUri = Uri.fromFile(file);

        final List<Intent> cameraIntents = new ArrayList<Intent>();
        final Intent captureIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
        final PackageManager packageManager = getPackageManager();
        final List<ResolveInfo> listCam = packageManager.queryIntentActivities(captureIntent, 0);
        for (ResolveInfo res : listCam) {
            final String packageName = res.activityInfo.packageName;
            final Intent i = new Intent(captureIntent);
            i.setComponent(new ComponentName(res.activityInfo.packageName, res.activityInfo.name));
            i.setPackage(packageName);
            i.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
            cameraIntents.add(i);

        }
        Intent i = new Intent(Intent.ACTION_GET_CONTENT);
        i.addCategory(Intent.CATEGORY_OPENABLE);
        i.setType("image/*");
        Intent chooserIntent = Intent.createChooser(i, "Image Chooser");
        chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, cameraIntents.toArray(new Parcelable[]{}));
        MainActivity.this.startActivityForResult(chooserIntent, FILECHOOSER_RESULTCODE);
    }

}

但是有一個問題還沒與解決，就是Android4.4的手機還是不能夠調用，如果有人知道，請告訴我，在此謝過