我想在Android Webview中实现照片捕捉功能。安卓网页浏览 使用文件上传。基本上当用户点击上传文件按钮时，系统应该启动相机并拍摄照片。
public class LoginActivity extends AppCompatActivity implements UpdateHelper.onUpdateCheckListener {
private static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;
public WebView webView;
public ImageView imageView;
private VideoView videoView;
private ValueCallback<Uri> mUploadMessage;
public ValueCallback<Uri[]> uploadMessage;
public static final int REQUEST_SELECT_FILE = 100;
private final static int FILECHOOSER_RESULTCODE = 1;
@SuppressLint({"SetJavaScriptEnabled", "NewApi"})
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
UpdateHelper.with(this).onUpdateCheck(this).check();
webView = findViewById(R.id.webview);
imageView = findViewById(R.id.img);
videoView = findViewById(R.id.videoview);
videoView.setZOrderOnTop(true);
WebClient webClient = new WebClient();
String path = "android.resource://" + getPackageName() + "/" + R.raw.vv;
videoView.setVideoURI(Uri.parse(path));
videoView.start();
imageView.setVisibility(View.GONE);
webView.setVisibility(View.GONE);
webView.setWebChromeClient(new WebChromeClient());
webView.getSettings().setLoadsImagesAutomatically(true);
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setAllowFileAccess(true);
webView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
webView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
webView.getSettings().setPluginState(WebSettings.PluginState.ON);
//webView.getSettings().setMediaPlaybackRequiresUserGesture(true);
webView.loadUrl("https://www.w3schools.com/html/html5_video.asp");
webView.getSettings().setAllowFileAccess(true);
webView.getSettings().setAllowFileAccess(true);
webView.getSettings().setAllowContentAccess(true);
videoView.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
videoView.setVisibility(View.GONE);
}
});
webView.setWebChromeClient(new WebChromeClient() {
public void onProgressChanged(WebView view, int progress) {
if (progress == 100) {
imageView.setVisibility(View.GONE);
videoView.setVisibility(View.GONE);
webView.setVisibility(View.VISIBLE);
}
}
// For 3.0+ Devices (Start)
// onActivityResult attached before constructor
protected void openFileChooser(ValueCallback uploadMsg, String acceptType) {
mUploadMessage = uploadMsg;
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("image/*");
startActivityForResult(Intent.createChooser(i, "File Browser"), FILECHOOSER_RESULTCODE);
}
// For Lollipop 5.0+ Devices
public boolean onShowFileChooser(WebView mWebView, ValueCallback<Uri[]> filePathCallback, WebChromeClient.FileChooserParams fileChooserParams) {
if (uploadMessage != null) {
uploadMessage.onReceiveValue(null);
uploadMessage = null;
}
uploadMessage = filePathCallback;
Intent intent = fileChooserParams.createIntent();
try {
startActivityForResult(intent, REQUEST_SELECT_FILE);
} catch (ActivityNotFoundException e) {
uploadMessage = null;
Toast.makeText(LoginActivity.this, "Cannot Open File Chooser", Toast.LENGTH_LONG).show();
return false;
}
return true;
}
//For Android 4.1 only
protected void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
mUploadMessage = uploadMsg;
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("image/*");
startActivityForResult(Intent.createChooser(intent, "File Browser"), FILECHOOSER_RESULTCODE);
}
protected void openFileChooser(ValueCallback<Uri> uploadMsg) {
mUploadMessage = uploadMsg;
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("image/*");
startActivityForResult(Intent.createChooser(i, "File Chooser"), FILECHOOSER_RESULTCODE);
}
});
webView.setDownloadListener(new DownloadListener() {
@Override
public void onDownloadStart(String url, String userAgent,
String contentDisposition, String mimetype,
long contentLength) {
if (checkLocationPermission()) {
DownloadManager.Request request = new DownloadManager.Request(
Uri.parse(url));
request.allowScanningByMediaScanner();
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED); //Notify client once download is completed!
request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, random());
DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
dm.enqueue(request);
Toast.makeText(getApplicationContext(), "Downloading File", //To notify the Client that the file is being downloaded
Toast.LENGTH_LONG).show();
}
}
});
webView.setWebViewClient(webClient);
// webView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
// webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
webView.setBackgroundColor(Color.TRANSPARENT);
if (isNetworkConnected()) {
webView.loadUrl("http://v-tube.xyz/login");
// videoView.setVisibility(View.GONE);
} else {
imageView.setImageResource(R.drawable.nointernet);
imageView.setVisibility(View.VISIBLE);
webView.setVisibility(View.GONE);
Toast.makeText(this, "No Internet Connection", Toast.LENGTH_SHORT).show();
}
}
@Override
public void onBackPressed() {
if (webView.canGoBack()) {
webView.goBack();
} else {
super.onBackPressed();
}
}
private boolean isNetworkConnected() {
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
return cm.getActiveNetworkInfo() != null;
}
@Override
public void onUpdateCheckListener(String urlApp) {
androidx.appcompat.app.AlertDialog alertDialog = new androidx.appcompat.app.AlertDialog.Builder(this).setTitle("Update Your App").setMessage("Please Update Your App to new Version.").setPositiveButton("UPDATE", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
final String appPackageName = getPackageName(); // getPackageName() from Context or Activity object
startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("https://play.google.com/store/apps/details?id=" + appPackageName)));
}
}).create();
alertDialog.show();
}
public class WebClient extends WebViewClient {
@Override
@TargetApi(Build.VERSION_CODES.M)
public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) {
super.onReceivedError(view, request, error);
webView.loadUrl("file:///android_asset/error.html");
}
@SuppressWarnings("deprecation")
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
super.onReceivedError(view, errorCode, description, failingUrl);
webView.loadUrl("file:///android_asset/error.html");
}
private void handleError(WebView view, int errorCode, String description, final Uri uri) {
webView.loadUrl("file:///android_asset/error.html");
}
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return false;
}
}
public boolean checkLocationPermission() {
if (ContextCompat.checkSelfPermission(LoginActivity.this,
Manifest.permission.WRITE_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
// Should we show an explanation?
if (ActivityCompat.shouldShowRequestPermissionRationale(LoginActivity.this,
Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
// Show an explanation to the user *asynchronously* -- don't block
// this thread waiting for the user's response! After the user
// sees the explanation, try again to request the permission.
new AlertDialog.Builder(LoginActivity.this)
.setTitle("Permission")
.setMessage("Please Share/on Your Location")
.setPositiveButton("ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
//Prompt the user once explanation has been shown
ActivityCompat.requestPermissions(LoginActivity.this,
new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
MY_PERMISSIONS_REQUEST_LOCATION);
startActivity(new Intent(LoginActivity.this, LoginActivity.class));
LoginActivity.this.overridePendingTransition(0, 0);
}
})
.create()
.show();
} else {
// No explanation needed, we can request the permission.
ActivityCompat.requestPermissions(LoginActivity.this,
new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
MY_PERMISSIONS_REQUEST_LOCATION);
}
return false;
} else {
return true;
}
}
public static String random() {
Random generator = new Random();
StringBuilder randomStringBuilder = new StringBuilder();
int randomLength = generator.nextInt(5);
char tempChar;
for (int i = 0; i < randomLength; i++) {
tempChar = (char) (generator.nextInt(96) + 32);
randomStringBuilder.append(tempChar);
}
return randomStringBuilder.toString();
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
if (requestCode == REQUEST_SELECT_FILE) {
if (uploadMessage == null)
return;
uploadMessage.onReceiveValue(WebChromeClient.FileChooserParams.parseResult(resultCode, intent));
uploadMessage = null;
}
} else if (requestCode == FILECHOOSER_RESULTCODE) {
if (null == mUploadMessage)
return;
// Use MainActivity.RESULT_OK if you're implementing WebView inside Fragment
// Use RESULT_OK only if you're implementing WebView inside an Activity
Uri result = intent == null || resultCode != LoginActivity.RESULT_OK ? null : intent.getData();
mUploadMessage.onReceiveValue(result);
mUploadMessage = null;
} else
Toast.makeText(LoginActivity.this, "Failed to Upload Image", Toast.LENGTH_LONG).show();
}
}